Weight loading mechanism and mass comparator

Abstract

The utility model relates to the technical field of mass measurement, and discloses a weight loading mechanism and a mass comparator, and the weight loading mechanism is arranged on the mass comparator to adjust the load distribution at the two ends of a balance beam so as to expand the measurement range. The weight loading mechanism comprises a plurality of counterweights which can be used independently or in a combined mode, at least two butt joint parts and a loading assembly. The butt joint parts are arranged at the first end and the second end of the balance beam respectively and used for being in butt joint with the corresponding counterweights. The loading assembly comprises a driving mechanism and a stowage piece, and the stowage piece is connected with the driving mechanism in a matched mode and can drive the corresponding balance weights to move. When the driving mechanism operates, the stowage piece can load part or all of the counterweights to the two ends of the balance beam or unload the counterweights from the two ends of the balance beam so as to dynamically adjust load distribution, so that the mass comparator can adapt to measurement requirements of different mass ranges, and the measurement stability and precision are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of quality measurement, and further relates to a weight loading mechanism and a quality comparator. BACKGROUND

[0002] The core structure of the quality comparator includes a balance beam, an electromagnetic force compensation device and a displacement sensor. Specifically, one end of the balance beam is provided with a scale pan for bearing a to-be-measured object, and the other end is connected to a reference load part (such as a standard weight or an electromagnetic force generating mechanism). When the to-be-measured object is placed on the scale pan, the balance beam generates displacement, the displacement sensor detects the displacement amount and feeds back to the control system, the electromagnetic force compensation device outputs a compensation current and generates an electromagnetic force to drive the balance beam to reset to the initial position, and finally the mass value is calculated through the linear relationship between the compensation current value and the weight of the to-be-measured object.

[0003] However, in the quality comparator, the measurement range of the sensor itself determines the maximum mass range that can be sensed, and the compensation capacity of the electromagnetic force compensation system also has a physical limit. When the mass of the to-be-measured object exceeds the effective range of the sensor, the system will not be able to reset the balance beam through electromagnetic force compensation, which will cause the quality comparator to be unable to perform normal measurement work. CONTENT OF THE INVENTION

[0004] In view of the above technical problems, the purpose of the present application is to provide a weight loading mechanism and a quality comparator, which can adjust the load distribution at both ends of the balance beam, and further the measurement range of the quality comparator, to adapt to to-be-measured objects of different mass ranges.

[0005] In order to achieve the above-mentioned purpose, the present application provides a weight loading mechanism, which is arranged in a quality comparator, the quality comparator has a balance beam, the balance beam has opposite first and second ends, and the weight loading mechanism comprises:

[0006] A plurality of counterbalance weights which can be used independently or in combination to form counterbalance loads of different masses;

[0007] At least two docking parts, which are respectively arranged at the first and second ends, are used to dock the corresponding counterbalance weights;

[0008] A loading assembly, which comprises a driving mechanism and a counterloading part, the counterloading part is connected with the driving mechanism, and a plurality of counterbalance weights are respectively connected with the counterloading part;

[0009] When the driving mechanism operates, the load matching member can drive the corresponding counterbalance weight to move, so as to load all or part of the counterbalance weight to both ends of the balance beam, or unload all or part of the counterbalance weight from both ends of the balance beam, so as to change the load distribution of both ends of the balance beam, and adjust the measurable range of the mass comparator.

[0010] In some embodiments, the plurality of counterbalance weights include at least two types of counterbalance weights with different masses, and the counterbalance weights are matched and connected to the corresponding load matching member in a preset number and / or preset combination.

[0011] In some embodiments, the load matching member is provided with a plurality of weight positioning portions arranged along the height direction of the load matching member, for carrying a plurality of counterbalance weights with the same mass or different masses along the height direction of the load matching member.

[0012] In some embodiments, the loading assembly includes a first loading assembly and a second loading assembly, the first loading assembly is arranged corresponding to a first end of the balance beam, the first end is close to the pan of the mass comparator, and the second loading assembly is arranged corresponding to a second end of the balance beam, the second end is close to the reference load part of the mass comparator.

[0013] The driving mechanism and the load matching member in the first loading assembly are distinguished as a first driving mechanism and a first load matching member, and the first driving mechanism and the first load matching member are connected to drive the first load matching member to move; the driving mechanism and the load matching member in the second loading assembly are distinguished as a second driving mechanism and a second load matching member, and the second driving mechanism and the second load matching member are connected to drive the second load matching member to move.

[0014] In some embodiments, the first loading assembly is arranged below the first end; the connecting part of the first end is a first connecting part, one side end of the first connecting part extends outward to form a first connecting protrusion in a circumferential direction, for preventing the counterbalance weight from falling off.

[0015] The weight positioning portion on the first load matching member is a weight positioning groove, and a plurality of weight positioning grooves are arranged in a stepped form, the counterbalance weight is loaded into the corresponding weight positioning groove and is connected to the first connecting part in a sleeved manner, and when the first driving mechanism drives the first load matching member to move, the counterbalance weight can move synchronously.

[0016] In some embodiments, when the counterbalance weight matched with the first loading assembly is loaded, a plurality of the counterbalance weights are stacked in a stacked structure based on the first connecting protrusion.

[0017] Or, the first interface part is further provided with a plurality of auxiliary interface protrusions, the horizontal height of the first interface protrusion is lower than that of any of the auxiliary interface protrusions, so that the counterbalance weight can be loaded on the auxiliary interface protrusion or the first interface protrusion.

[0018] In some embodiments, the second loading assembly is arranged above the second end; the interface part of the second end is a second interface part, and the second end is provided with a via hole matched with the second loading member;

[0019] The weight positioning part on the second loading member is a positioning protrusion, the counterbalance weight is sleeved on the second loading member, in a first state, the counterbalance weight abuts against the corresponding positioning protrusion to move synchronously with the second loading member; in a second state, under the driving action of the second driving mechanism, the positioning protrusion at the end of the second loading member extends into the via hole until at least one counterbalance weight abuts against the second interface part.

[0020] In some embodiments, on the second loading member, one positioning protrusion is arranged between every two counterbalance weights, and each counterbalance weight is provided with at least one empty part for accommodating the corresponding positioning protrusion, so that a plurality of counterbalance weights are arranged in a stacked manner when abutting against the second interface part at the same time.

[0021] A weight positioning structure is arranged between adjacent two counterbalance weights, for preventing the corresponding counterbalance weight from deviating when the counterbalance weights are arranged in a stacked manner.

[0022] In some embodiments, the driving mechanism is configured to drive the loading member in the height direction to realize the lifting movement of the counterbalance weight.

[0023] The weight loading mechanism further comprises a mounting seat, the mounting seat is relatively fixed inside the mass comparator, and the mounting seat has a mounting space penetrating through the height thereof, and at least part of the loading assembly is fixed in the mounting space to connect the loading assembly to the mass comparator.

[0024] Another aspect of the present application also provides a mass comparator, comprising:

[0025] A balance beam;

[0026] A scale pan arranged at the first end of the balance beam for carrying a to-be-measured object;

[0027] A sensor for detecting the displacement or inclination angle of the balance beam and generating a corresponding signal;

[0028] An electromagnetic force generating device is disposed at the second end of the balance beam, and is used to generate electromagnetic force according to the signal to keep the balance beam in a preset balance position;

[0029] The aforementioned weight loading mechanism is used to adjust the load distribution at the first and second ends of the balance beam;

[0030] The processing module is used to calculate and process the mass of the object under test based on the output of the electromagnetic force generating device.

[0031] Compared with the prior art, the weight loading mechanism and mass comparator provided in this application have the following advantages:

[0032] By controlling the selective loading / unloading of multiple counterweights by the drive mechanism, the load distribution at both ends of the balance beam can be quickly adjusted, so that the mass comparator can adapt to the measurement needs of different ranges of the test objects without changing the sensor or weight set, thus significantly improving the applicability of the instrument.

[0033] In addition, in this scheme, the balancing weights can be used independently or in combination. By superimposing different mass units, discrete or continuous balancing loads can be formed, which can not only meet the needs of coarse adjustment over a wide range, but also achieve fine adjustment by combining electromagnetic force compensation, ensuring measurement resolution and accuracy across the entire range. Attached Figure Description

[0034] The preferred embodiments will now be described in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of this application.

[0035] Figure 1 This is a schematic diagram of the overall structure of the mass comparator using a weight loading mechanism in one embodiment of this application;

[0036] Figure 2 This is a partial structural schematic diagram of the weight loading mechanism at the location of the first loading component in one embodiment of this application;

[0037] Figure 3 This is a partial structural diagram of the weight loading mechanism at the location of the second loading component in one embodiment of this application.

[0038] Figure 4 This is a schematic diagram of the overall structure of the mass comparator in one embodiment of this application.

[0039] Explanation of reference numerals: balance beam 10; first end 101; second end 102; via hole 1020; counterbalance weight 20; vacancy 200; first butt joint part 301; first butt joint protrusion 3011; second butt joint part 302; first loading assembly 40; first driving mechanism 401; first counterweight 402; weight positioning groove 4021; second loading assembly 50; second driving mechanism 501; second counterweight 502; positioning protrusion 5021; mounting seat 550; weight positioning structure 60; scale pan 70; electromagnetic force generating device 80; display module 90. DETAILED DESCRIPTION

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the specific embodiments of the present application will be described below with reference to the drawings. Obviously, the drawings in the following description only represent some of the embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor, and other embodiments can also be obtained.

[0041] In order to make the drawing simple, only the parts related to the application are shown in each drawing, and they do not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, in some drawings, only one of the parts with the same structure or function is shown schematically, or only one of them is marked. In this paper, "one" not only means "only one", but also means "more than one".

[0042] It should be further understood that the term "and / or" used in the present application specification and the appended claims means any combination of one or more of the associated listed terms and all possible combinations, and includes these combinations.

[0043] In this paper, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] In the description of the present application, it should be understood that 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" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0045] In addition, in the description of the present application, the terms "first", "second" and the like are only used for differentiation and cannot be understood as indicating or implying relative importance.

[0046] The core structure of the mass comparator includes a balance beam, an electromagnetic force compensation device and a displacement sensor. Specifically, one end of the balance beam is provided with a pan for carrying the measured object, and the other end is connected with a reference load part (such as a standard weight or an electromagnetic force generating mechanism). When the measured object is placed on the pan, the balance beam generates displacement, the displacement sensor detects the displacement amount and feeds back to the control system, the electromagnetic force compensation device outputs compensation current and generates electromagnetic force to drive the balance beam to reset to the initial position, and finally the mass value is calculated through the compensation current value and other data values.

[0047] In the prior art, the measurement range of the sensor itself determines the maximum mass range that can be sensed, and the compensation capacity of the electromagnetic force compensation device also has a physical limit. When the mass of the measured object exceeds the effective range of the sensor, the required compensation current will exceed the maximum output capacity of the power amplifier, resulting in that the electromagnetic force compensation device cannot drive the balance beam to reset, and the system is forced to enter an overload protection state, finally resulting in distorted measurement results or equipment shutdown.

[0048] In one embodiment, referring to the drawings attached Figure 1 A weight loading mechanism provided by the present application is described, which can dynamically load or unload the load at both ends of the balance beam 10, so that the mass comparator can not be limited by the range of the sensor.

[0049] Referring to the drawings attached Figures 1 to 3 A weight loading mechanism provided by the present application is described, which can dynamically load or unload the load at both ends of the balance beam 10, so that the mass comparator can not be limited by the range of the sensor.

[0050] Specifically, the counterbalance weight 20 can be used alone or in combination to form counterbalance loads of different masses to adapt to different measurement requirements. To ensure stable loading of the counterbalance weight 20, the first end 101 and the second end 102 of the balance beam 10 are respectively provided with a docking portion for docking the corresponding counterbalance weight 20, so that the weight can be reliably attached and connected to the balance beam 10, avoiding displacement of the weight due to accidental factors such as vibration or misoperation, thereby affecting the measurement accuracy.

[0051] The loading assembly includes a driving mechanism and a loading member, which is connected with the driving mechanism and can carry a plurality of counterbalance weights 20. When the driving mechanism is in operation, the loading member can drive the corresponding counterbalance weight 20 to move in the loading direction or the unloading direction. When the counterbalance weight 20 is loaded to the docking portion of the balance beam 10, the load at the corresponding end portion is increased, thereby adjusting the measurable range of the mass comparator; on the contrary, when the counterbalance weight 20 is unloaded, the load at the end portion of the balance beam 10 is reduced, so that the mass comparator can adapt to the measurement requirement of a smaller range. This adjustable weight loading method can enable the mass comparator to achieve high-precision measurement in a larger mass range, while avoiding the problem of measurement failure caused by a single range setting.

[0052] Specifically, when measuring a large mass sample, the driving mechanism drives the loading member to move, and a corresponding number of counterbalance weights 20 are loaded to both ends of the balance beam 10, so that the static initial load of the balance beam 10 is increased, thereby reducing the burden of the electromagnetic force compensation device and ensuring that it can still provide effective compensation force to achieve measurement. On the contrary, when measuring a small mass sample, the driving mechanism drives the loading member to move, and the counterbalance weights 20 are unloaded from the balance beam 10, so that the system returns to a state suitable for small mass measurement, avoiding interference of the additional load on high-precision measurement.

[0053] In actual application, when the counterbalance weight 20 is loaded to the balance beam 10, the weight loading mechanism can include the following working modes. First, symmetrical synchronous loading on both sides, by controlling the driving mechanism to load the same mass of counterbalance weight 20 to the first end 101 and the second end 102 of the balance beam 10 at the same time, the uniform expansion of the range is realized by increasing the counterbalance load at both ends. For example, when it is necessary to increase the upper limit of the mass comparator from the original range, the system can simultaneously load equal weights to both ends, thereby quickly expanding the range and ensuring the symmetry of the balance beam 10.

[0054] In addition, the two sides are asymmetrically loaded, and the loading mass at both ends of the balance beam 10 is independently adjusted. In other words, the counterweight 20 at the first end 101 can be greater / smaller than the counterweight 20 at the second end 102. Compared with the first working mode, this working mode can further adapt to a larger range of measurement requirements. Understandably, in this way, the amount of counterweight 20 used can be reduced, and the range of the mass comparator can be further expanded upwards or downwards by adjusting the counterweights on both sides.

[0055] It should be noted that the weight loading mechanism can adopt various embodiments. For example, the counterweight 20 can adopt a modular design, that is, different weights can be combined through quick plug-in or magnetic attraction, which facilitates users to adjust according to measurement requirements. In addition, the driving mechanism of the loading assembly can be electric, pneumatic or mechanical driving, such as motor-driven screw mechanism, gear transmission or cam mechanism, to realize accurate loading and unloading of the weight.

[0056] Based on the above, further, the plurality of counterweights 20 at least includes two counterweights 20 of different masses, and can be connected to the counterweight in a preset number and / or a preset combination to realize accurate load adjustment.

[0057] Specifically, the counterweights 20 of different masses can form various matching modes to adapt to different measurement requirements. For example, two types of light mass and heavy mass can be set, wherein the light mass is suitable for fine measurement adjustment, and the heavy mass is used for large range load compensation.

[0058] Meanwhile, in actual application, the counterweight 20 can realize step-by-step adjustment of the measurement range through different number of combination modes, so that the mass comparator can be adjusted in a more fine measurement range. For example, when the measured object exceeds the current range, the counterweight 20 can be directly loaded on the balance beam 10, for example, a large mass of 100g is directly loaded; but also, several 10g, 20g, 50g weights can be configured in sequence, and through the single stacking of small mass weights, the load distribution of the balance beam 10 can be adjusted, and the measurement index and implementation can be monitored respectively when loading multiple independent weights.

[0059] Based on the above, in one embodiment, the driving mechanism is configured to drive the counterweight along the height direction, and realizes accurate loading and unloading of the counterweight 20 through linear lifting motion, avoiding complex horizontal motion mechanism, so that the counterweight 20 can always move along the vertical direction during loading, thereby reducing lateral displacement and friction interference, and improving loading accuracy.

[0060] As Figure 2 orFigure 3 As shown, the weight loading mechanism includes a mounting base 550, which is fixed to the interior of the mass comparator and has an installation space extending through its height. At least a portion of the loading component is fixed within the installation space, providing sufficient movement space for the drive mechanism so that the drive mechanism can smoothly drive the loading component and the counterweight 20 to move up and down.

[0061] In one embodiment, the loading component is provided with a plurality of weight positioning parts, and the weight positioning parts are arranged along the height direction of the loading component, thereby realizing the orderly loading and mounting of the weights.

[0062] Specifically, the arrangement of the weight positioning section allows the weighing weights 20 to be stacked along the height direction, thereby optimizing space utilization and reducing the problem of excessive equipment size that may result from horizontal arrangement. In addition, this vertical arrangement ensures that the weighing weights 20 are not easily disturbed by external factors during loading or unloading, thus improving measurement accuracy.

[0063] Optionally, the weight positioning part can be configured as a slot type, magnetic type, etc. For example, in the slot type, the weighing weight 20 is loaded onto the weighing component through a preset slot structure, so that it can be stably connected; or magnetic materials and magnetic adsorption devices are used so that the weighing weight 20 can be attracted to the weight positioning part by attraction, thereby achieving a reliable connection without the use of mechanical buckles, and at the same time facilitating quick assembly, disassembly and adjustment.

[0064] In practical applications, weights of the same mass can be installed on different weight positioning parts according to measurement needs to uniformly increase the measurement range; or different weights 20 can be combined to form a more precise mass adjustment.

[0065] Based on the above embodiments, the loading components include a first loading component 40 and a second loading component 50. The first loading component 40 is set at the first end 101 of the balance beam 10, and the first end 101 is close to the weighing pan 70 of the mass comparator. The second loading component 50 is set at the second end 102 of the balance beam 10, and the second end 102 is close to the reference load part of the mass comparator.

[0066] Thus, the drive mechanism and the mounting component within the first loading component 40 are distinguished as the first drive mechanism 401 and the first mounting component 402, and the first drive mechanism 401 and the first mounting component 402 are connected to drive the first mounting component 402 to move; the drive mechanism and the mounting component within the second loading component 50 are distinguished as the second drive mechanism 501 and the second mounting component 502, and the second drive mechanism 501 and the second mounting component 502 are connected to drive the second mounting component 502 to move.

[0067] Understandably, since the first end 101 mainly corresponds to the object to be measured, while the second end 102 mainly corresponds to the reference load, different weight loading strategies can be adopted in different application scenarios to adapt to different mass measurement tasks.

[0068] Through the design of this application, the first loading component 40 and the second loading component 50 can operate independently, avoiding the limitations of synchronous adjustment of the balance at both ends. It should be noted that in this application, both the first drive mechanism 401 and the second drive mechanism 501 are configured as miniature electric cylinders. By connecting the output end of the miniature electric cylinder to the corresponding load-bearing component, the movement of the load-bearing component is achieved, thereby causing the balance weight 20 to move to a certain extent. However, in other embodiments, the first drive mechanism 401 and the second drive mechanism 501 can adopt other forms, such as cylinders, hydraulic cylinders, or other similar functional structures.

[0069] Furthermore, the connection between the first drive mechanism 401, the second drive mechanism 501, and the corresponding loading components can take various forms, including direct connection and indirect connection. Direct connection is easy to understand, meaning the output end of the drive mechanism is directly connected to the loading component. Indirect connection can use an intermediate adapter or transmission structure to indirectly transmit the power of the drive mechanism to the loading component, enabling the loading component to move synchronously or with a lag. For space-constrained mass comparators, appropriate connection methods can be adopted to make the weight loading mechanism more compact and improve the overall rationality of the equipment design.

[0070] Optionally, in some cases, an integrated design can be adopted, where the load-bearing component and the output end of the drive mechanism are integrated. In this case, the load-bearing component itself is a direct component of the drive mechanism. For example, if the drive mechanism is a miniature electric cylinder, the load-bearing component can be designed as the mover of the electric cylinder, directly performing linear motion under the drive of the electric cylinder, thereby loading or unloading the weight. If the drive mechanism is a gear transmission device, the load-bearing component can be set as part of a rack (meshing with a gear) so that the movement of the load-bearing component is realized through the rotational motion of the gear.

[0071] In one embodiment, the first loading component 40 is disposed below the first end 101 to prevent the weight loading mechanism from affecting the normal use of the mass comparator weighing pan 70, ensuring that the object being measured will not be disturbed during placement and weighing, thereby ensuring measurement accuracy, while lowering the center of gravity of the loading mechanism and improving the stability of the mass comparator.

[0072] Furthermore, such as Figure 2As shown, the weight positioning part on the first loading member 402 is a weight positioning groove 4021. Several weight positioning grooves 4021 are arranged in a stepped manner. The weighing weights 20 are respectively loaded into the corresponding weight positioning grooves 4021 and form a sleeve with the first docking part 301. When the first driving mechanism 401 drives the first loading member 402 to move, the weighing weights 20 can move synchronously. Under normal circumstances, each weight positioning groove 4021 can accommodate one or more weighing weights 20 of the same mass.

[0073] Meanwhile, the docking part provided at the first end 101 is the first docking part 301. One side end of the first docking part 301 extends outward in a circumferential direction to form a first docking protrusion 3011. Since the balancing weights 20 and the first docking part 301 form a sleeve relationship, the balancing weights 20 will not accidentally fall off or become misaligned during loading and unloading.

[0074] Referring to the attached diagram in the instruction manual, the balancing weights 20 can be loaded in a stepped manner to avoid measurement errors or impacts caused by the simultaneous release of multiple weights. For example, when performing high-precision measurements over a small range, only the small-mass balancing weights 20 located in the lower positioning slot can be used; while when an extended range is required, weights in multiple positioning slots at different positions can be combined and loaded simultaneously. Moreover, by pre-setting multiple positioning slots at different heights, weights of different masses can be gradually loaded according to measurement needs, achieving more precise mass adjustment.

[0075] Optionally, an elastic buffer material is provided in the weight positioning groove 4021 to reduce the impact force when the weight is loaded and unloaded, and to extend the service life of the balancing weight 20 and the first loading component 402.

[0076] In one embodiment, based on the above embodiment, the counterweights 20, which are used in conjunction with the first loading component 40, are stacked sequentially on the first abutment protrusion 3011 to form a stacked structure during loading. Specifically, the first abutment protrusion 3011 serves as the basic support surface, and all the counterweights 20 are stacked on top of each other during the loading process to form a vertical stack.

[0077] like Figure 2 As shown, the bottom of the lowest balancing weight 20 contacts the first docking protrusion 3011, while its top sequentially supports the subsequent weights. This method can achieve a large mass loading in a limited space while maintaining the compactness of the structure.

[0078] In another embodiment, different from the previous embodiment, a plurality of auxiliary docking protrusions (not shown in the figure) are additionally arranged on the first docking portion 301, and the horizontal height of the first docking protrusion 3011 is lower than that of all the auxiliary docking protrusions, i.e., the first docking protrusion 3011 is located at the lowest layer, and the plurality of auxiliary docking protrusions are arranged in sequence along the height direction. Thus, the counterweight 20 of different heights corresponds to the auxiliary docking protrusion of different heights, which can reduce the distance and energy consumption required for the driving mechanism to run, realize rapid and small-range mass adjustment, and make the loading more flexible.

[0079] In one embodiment, as shown in Figure 3 The second loading assembly 50 is arranged above the second end 102. Generally, the electromagnetic force generating device 80 in the mass comparator is arranged below the second end 102. Thus, the second loading assembly 50 can avoid interfering with the electromagnetic force generating device 80, and ensure the normal operation of the electromagnetic force compensation function.

[0080] The docking portion arranged on the second end 102 is a second docking portion 302, and the second end 102 is provided with a via hole 1020 adapted to the second counterweight 502; the weight positioning portion on the second counterweight 502 is a positioning protrusion 5021, and the counterweight 20 is sleeved on the second counterweight 502.

[0081] In the first state, all counterweights 20 abut against the corresponding positioning protrusions 5021 to move synchronously with the second counterweight 502; in the second state, under the driving action of the second driving mechanism 501, the positioning protrusion 5021 at the end of the second counterweight 502 extends into the via hole 1020 until at least one counterweight 20 is docked to the second docking portion 302; and since the counterweight 20 is sleeved on the second counterweight 502, the counterweight 20 can sequentially separate from the corresponding positioning protrusion 5021 and stably dock with the second docking portion 302 during the loading process.

[0082] It can be understood that, through the cooperation between the positioning protrusion 5021 and the via hole 1020 in the embodiment, the counterweight 20 can be gradually docked with the second docking portion 302, and the step-by-step loading of the counterweight 20 is effectively realized. Thus, through the combination loading of different weight grades, the measurement range of the mass comparator can be flexibly adjusted.

[0083] In addition, the second abutment portion 302 can be provided as a limiting protrusion. As shown in the drawings, the bottommost counterbalance weight 20 can be provided with a corresponding limiting structure on the side surface of the second abutment portion 302, so that the counterbalance weight 20 can be flatly abutted with the limiting protrusion. More preferably, the limiting structure is partially embedded in the via 1020 provided on the balance beam 10, further enhancing the reliability of the abutment of the counterbalance weight 20 and the balance beam 10.

[0084] Further, in one embodiment, a positioning protrusion 5021 is provided between every two counterbalance weights 20 on the second loading member 502, which plays a limiting and aligning function during the loading and transmission of the weights. Each counterbalance weight 20 is provided with at least one recess 200 for accommodating the corresponding positioning protrusion 5021, so that the counterbalance weights 20 can be aligned and stacked in sequence when loaded, thereby saving the height space of the mass comparator.

[0085] Optionally, a weight positioning structure 60 is provided between the adjacent two counterbalance weights 20. The weight positioning structure 60 is generally a concave-convex structure or other mechanical limiting means, so that the stacked counterbalance weights 20 can be matched with each other in the stacked state, preventing the counterbalance weights 20 from being laterally deviated during the loading process, and also assisting the abutment loading of the counterbalance weights 20, thereby playing a certain guiding role.

[0086] In one embodiment, referring to the drawings attached hereto Figure 1 and Figure 4 According to another aspect of the present application, the present application further provides a mass comparator, which comprises a balance beam 10, a pan 70, a sensor, an electromagnetic force generating device 80, a processing module, and the weight loading mechanism described above.

[0087] Specifically, the pan 70 is arranged at the first end 101 of the balance beam 10, and the electromagnetic force generating device 80 is arranged at the second end 102 of the balance beam 10. The pan 70 is used to carry the object to be measured. The sensor can detect the displacement or inclination angle of the balance beam 10 and generate a corresponding signal. Then, the electromagnetic force generating device 80 generates an electromagnetic force to keep the balance beam 10 at a preset balance position according to the signal sent by the sensor. The processing module calculates and processes the data based on the output quantity (output current value) of the electromagnetic force generating device 80, and finally obtains the mass of the object to be measured.

[0088] Importantly, in the present embodiment, the weight loading mechanism described above is used to load weights of different masses at the first end 101 and the second end 102 of the balance beam 10, respectively. The weight loading mechanism can adjust the load distribution at both ends of the balance beam 10 before or during the measurement, so that the mass of the object to be measured is always within the working range of the electromagnetic force generating device 80, thereby effectively expanding the application range of the mass comparator.

[0089] Further, the quality comparator also comprises a display module 90 to display the measurement results, and a touch element can also be integrated on the display module 90 to adjust the counterbalance load at both ends of the balance beam 10 through touch.

[0090] It should be noted that the above embodiments can be freely combined as needed. The above is only a preferred embodiment of the present application, and it should be pointed out that those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A weight loading mechanism, characterized by, The weight loading mechanism is arranged in a mass comparator, the mass comparator has a balance beam with opposite first and second ends, the weight loading mechanism comprises: a plurality of counterbalance weights which can be used independently or in combination to form counterbalance loads of different masses; at least two docking portions arranged respectively at the first and second ends for docking the corresponding counterbalance weights; a loading assembly comprising a driving mechanism and a load carrier, the load carrier is connected with the driving mechanism, and the plurality of counterbalance weights are connected with the load carrier respectively; when the driving mechanism operates, the load carrier can drive the corresponding counterbalance weights to move, so as to load all or part of the counterbalance weights to the two ends of the balance beam, or unload all or part of the counterbalance weights from the two ends of the balance beam, so as to change the load distribution of the two ends of the balance beam and adjust the measurable range of the mass comparator.

2. The weight loading mechanism according to claim 1, wherein the plurality of counterbalance weights comprise at least two counterbalance weights of different masses, and the counterbalance weights are connected to the corresponding load carrier in a preset number and / or preset combination.

3. The weight loading mechanism according to claim 1, wherein the load carrier is provided with a plurality of weight positioning portions arranged along the height direction of the load carrier, for carrying a plurality of counterbalance weights of the same mass or different masses along the height direction of the load carrier.

4. The weight loading mechanism according to claim 3, wherein the loading assembly comprises a first loading assembly and a second loading assembly, the first loading assembly is arranged corresponding to the first end of the balance beam, the first end is close to the scale pan of the mass comparator, and the second loading assembly is arranged corresponding to the second end of the balance beam, the second end is close to the reference load portion of the mass comparator; the driving mechanism and the load carrier in the first loading assembly are distinguished as a first driving mechanism and a first load carrier, the first driving mechanism and the first load carrier are connected to drive the first load carrier to move, and the driving mechanism and the load carrier in the second loading assembly are distinguished as a second driving mechanism and a second load carrier, the second driving mechanism and the second load carrier are connected to drive the second load carrier to move.

5. The weight loading mechanism according to claim 4, wherein the first loading assembly is arranged below the first end, and the docking portion of the first end is a first docking portion, one side end of the first docking portion extends outwardly to form a first docking protrusion in a circumferential direction, for preventing the counterbalance weights from falling off; the weight positioning portions on the first load carrier are weight positioning grooves, and a plurality of the weight positioning grooves are arranged in a stepped form, the counterbalance weights are loaded into the corresponding weight positioning grooves and are sleeved with the first docking portion, and when the first driving mechanism drives the first load carrier to move, the counterbalance weights can move synchronously.

6. The weight loading mechanism according to claim 5, wherein When the counterbalance weights are loaded in the first loading assembly, the counterbalance weights are stacked in a stack structure based on the first docking protrusions; Or, The first docking portion is further provided with auxiliary docking protrusions, the height of the first docking protrusions is lower than that of any auxiliary docking protrusion, so that the counterbalance weights can be loaded on the auxiliary docking protrusions or the first docking protrusions.

7. The weight loading mechanism according to claim 4, wherein The second loading assembly is arranged above the second end, the docking portion of the second end is a second docking portion, and the second end is provided with a via hole matched with the second loading member; The weight positioning portion on the second loading member is a positioning protrusion, the counterbalance weight is sleeved on the second loading member, in a first state, the counterbalance weight abuts against the corresponding positioning protrusion to move synchronously with the second loading member; In a second state, under the driving action of the second driving mechanism, the positioning protrusion at the end of the second loading member extends into the via hole until at least one counterbalance weight is docked to the second docking portion.

8. The weight loading mechanism according to claim 7, wherein On the second loading member, one positioning protrusion is arranged between every two counterbalance weights, and each counterbalance weight is provided with at least one empty part for accommodating the corresponding positioning protrusion, so that multiple counterbalance weights are arranged in a stacked manner when they are docked to the second docking portion at the same time; A weight positioning structure is arranged between adjacent two counterbalance weights to prevent the corresponding counterbalance weight from deviating when the counterbalance weights are arranged in a stacked manner.

9. The weight loading mechanism according to any one of claims 1-8, wherein The driving mechanism is configured to drive the loading member in the height direction to realize the lifting movement of the counterbalance weight; The weight loading mechanism further comprises a mounting seat, the mounting seat is relatively fixed in the mass comparator, and the mounting seat has a mounting space penetrating through its height, and at least part of the loading assembly is fixed in the mounting space to connect the loading assembly to the mass comparator.

10. A mass comparator characterized in that, It comprises: a balance beam; a scale pan arranged at the first end of the balance beam for carrying a to-be-measured object; a sensor for detecting the displacement or inclination angle of the balance beam and generating a corresponding signal; an electromagnetic force generating device arranged at the second end of the balance beam for generating an electromagnetic force to keep the balance beam at a preset balance position according to the signal; the weight loading mechanism according to any one of claims 1-9 for adjusting the load distribution of the first end and the second end of the balance beam; a processing module for calculating the mass of the to-be-measured object based on the output of the electromagnetic force generating device.

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