electronic balance

Abstract

The application relates to the weighing field and discloses an electronic balance, which comprises a shell assembly, a bearing piece, a weighing assembly and an internal calibration assembly. An installation cavity is formed in the shell assembly, the bearing piece is arranged in the installation cavity, and the bearing piece is formed with an avoiding space extending in a height direction through a first avoiding part. The weighing assembly comprises a strain beam sensor, a weighing part and a support frame. The strain beam sensor is installed on the bearing piece, at least part of the strain beam sensor is located in the avoiding space, and the support frame is connected with the weighing part and a stress end of the strain beam sensor respectively. The internal calibration assembly is arranged in the installation cavity and at least part of the internal calibration assembly is located in the avoiding space. The internal calibration assembly is in transmission cooperation with the support frame so as to apply a calibration load to the strain beam sensor. At least part of the strain beam sensor and the internal calibration assembly is arranged in the avoiding space, which is favorable for reducing the space occupation of the related components in the height direction, improving the internal space utilization, and further reducing the overall thickness and size of the electronic balance.

Description

Technical Field

[0001] This application relates to the field of weighing, and more particularly to an electronic balance. Background Technology

[0002] Electronic balances typically require internal sensors and calibration mechanisms to perform weighing and calibration functions. In existing electronic balances, the sensors and calibration mechanisms are mostly arranged conventionally inside the housing. These components occupy a large amount of space in the height direction, easily resulting in stacked configurations. This leads to low utilization of the overall internal space and also hinders the development of miniaturized and thinner electronic balances. Summary of the Invention

[0003] To address the aforementioned technical problems, the purpose of this application is to provide an electronic balance that reduces the occupancy of related structures in the height direction, thereby reducing the overall thickness and size of the electronic balance.

[0004] To achieve the above objectives, this application provides an electronic balance, comprising: The housing assembly has an internal mounting cavity; A support member is disposed within the mounting cavity. The support member is provided with a first clearance portion, which forms a clearance space extending along the height direction. A weighing assembly includes a strain beam sensor, a weighing section, and a support frame. The strain beam sensor is mounted on the load-bearing member, and at least a portion of the strain beam sensor is located within the clearance space. The support frame includes a support body and a side arm extending from the support body towards the load-bearing member. The support body is connected to both the weighing section and the force-bearing end of the strain beam sensor to transmit the weighing load. An internal calibration component is disposed within the mounting cavity. The internal calibration component is used to calibrate the strain beam sensor, and at least a portion of the internal calibration component is located within the clearance space. The internal calibration component is driven to engage with the side arm to apply a calibration load to the strain beam sensor through the side arm in the calibration state.

[0005] In some embodiments, the support body is provided with a first docking portion and a second docking portion, the first docking portion and the second docking portion being distributed at intervals on the support body; The support frame is connected to the force-bearing end of the strain beam sensor via the first docking part, and the weighing part is connected to the second docking part. The weighing load borne by the weighing part is transmitted to the force-bearing end of the strain beam sensor in sequence via the second docking part, the support body and the first docking part.

[0006] In some embodiments, the side arm includes a first side arm and a second side arm, the first side arm and the second side arm being respectively connected to opposite sides of the support body; The first side arm is positioned close to the inner calibration component, and a third docking part is provided on the first side arm. The execution end of the inner calibration component is in transmission cooperation with the third docking part.

[0007] In some embodiments, the second side arm is provided with a first limiting part, and the carrier is provided with a second limiting part; The first limiting part and the second limiting part are arranged opposite to each other in the height direction and have a limiting gap. When the support frame is displaced to the limit position in the height direction, the first limiting part and the second limiting part abut against each other to limit the displacement of the support frame in the height direction.

[0008] In some embodiments, the top surface of the support body is provided with a protective structure, the protective structure including a protective groove surrounding the second docking portion, the protective groove being spaced apart from and not communicating with the second docking portion; the electronic balance has a weighing pan, the opening of the protective groove facing the side of the weighing portion that mates with the weighing pan, so as to form a receiving space for trapping impurities.

[0009] In some embodiments, the protective structure further includes a guide surface disposed on the outside of the protective groove; the guide surface extends downward at an angle from the side close to the protective groove toward the side away from the protective groove, for guiding impurities falling on the guide surface toward the periphery of the support frame.

[0010] In some embodiments, the second docking portion includes an insertion hole formed on the support body, and the weighing portion includes a mating post disposed at one end thereon, the mating post being inserted and fixed in the insertion hole, and the outer peripheral wall of the mating post being in contact with the inner wall of the insertion hole; The protective groove is arranged around the outer periphery of the insertion hole.

[0011] In some embodiments, the first docking portion includes multiple sets of mounting holes distributed on the support body, the multiple sets of mounting holes having different hole spacing specifications to adapt to the installation and positioning of strain beam sensors with different range specifications.

[0012] In some embodiments, the housing assembly includes a top shell and a bottom shell, which close together to form the mounting cavity; The support member is disposed between the top shell and the bottom shell, the weighing component and the inner calibration component are respectively disposed on the side of the support member facing the top shell, and at least a portion of the weighing component and the inner calibration component are located within the clearance space.

[0013] In some embodiments, the support member includes a main base plate, the first clearance portion includes a side wall and a bottom wall, the side wall extends from the main base plate toward the bottom shell, and the bottom wall is connected to the side edge of the side wall away from the main base plate; The first clearance portion forms a recessed structure relative to the main body base plate, and the side wall and the bottom wall together enclose the clearance space.

[0014] In some embodiments, there is a gap between the bottom wall and the bottom shell, and a through hole is provided on the bottom wall along the height direction. The weighing component and / or the internal calibration component further includes a fixing structure that extends into the gap through the through hole and is fixed to the side surface of the bottom wall opposite to the top shell. And / or, the carrier further includes a side support wall that extends from the edge of the main body base plate toward the top shell; And / or, the bottom shell is provided with a second clearance portion corresponding to the position of the first clearance portion, the second clearance portion protruding away from the top shell to form a partially recessed structure on the bottom shell, the second clearance portion and the first clearance portion are stacked in the height direction; wherein, the bottom wall and the second clearance portion are spaced apart from each other; And / or, at least a portion of the bottom surface of the main body base plate abuts against and is fixed to at least a portion of the structure of the bottom shell, and the abutment and fixing position of the main body base plate and the bottom shell is located at the periphery of the first clearance portion.

[0015] In some embodiments, the housing assembly is made of plastic, and the carrier is made of metal.

[0016] Compared with the prior art, this application has at least the following beneficial effects: By setting a carrier in the mounting cavity and forming a first clearance part on the carrier, at least part of the strain beam sensor and the internal calibration component can enter the clearance space, thereby compressing the arrangement space of the weighing component and the internal calibration component in the height direction. This can improve the compactness of the internal structure of the electronic balance, reduce the thickness and size of the whole machine, and facilitate the miniaturization and thinning of the electronic balance.

[0017] On the other hand, the support frame includes a main support body and a side arm extending from the main support body towards the load-bearing component. The main support body is used to transfer the weighing load borne by the weighing unit to the strain beam sensor, and the side arm is used to engage with the internal calibration component for transmission and to apply a calibration load to the strain beam sensor in the calibration state. In this way, the weighing load transfer and calibration load application can be completed on the same support frame, which helps to reduce the setting of independent force transmission structures and independent calibration loading structures, making the arrangement of the weighing component, internal calibration component and strain beam sensor more compact. Attached Figure Description

[0018] 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.

[0019] Figure 1 , Figure 2 These are schematic diagrams of the overall structure of an electronic balance in one embodiment of this application; Figure 3 This is a partial structural exploded view of an electronic balance in one embodiment of this application; Figure 4 This is a cross-sectional view of an embodiment of the present application when no internal components are installed inside the housing assembly; Figure 5 This is a cross-sectional schematic diagram of an embodiment of the present application in which the housing assembly contains internal components; Figure 6 , Figure 7 These are partial structural schematic diagrams of an electronic balance in one embodiment of this application; Figure 8 This is to illustrate the relevant structure of the second docking section; Figure 9 This is a schematic diagram of the structure of the carrier in one embodiment of this application; Figure 10 This is a schematic diagram of an embodiment of this application from a bottom-side view; Figure 11 , Figure 12 Each example illustrates the corresponding design relationship between the load-bearing component and the bottom shell in one embodiment. Figure 13 and Figure 14 These are schematic diagrams of the support frame from different perspectives.

[0020] Reference numerals in the attached figures: 1. Outer shell assembly; 11. Mounting cavity; 12. Top shell; 13. Bottom shell; 131. Second clearance part; 14. Positioning structure; 2. Supporting component; 21. First clearance part; 211. Clearance space; 212. Side wall; 213. Bottom wall; 2131. Through hole; 22. Main body base plate; 23. Side support wall; 24. Second limiting part; 241. Connecting column; 242. Connecting screw; Weighing assembly 3; strain beam sensor 31; support frame 32; support body 321; first docking part 3211; mounting hole 32111; second docking part 3212; insertion hole 32121; protective groove 3213; guide surface 3214; side arm part 322; first side arm 3221; third docking part 32211; second side arm 3222; first limiting part 32221; weighing part 33; mating column 331; Internal calibration component 4; drive component 40; loading end 41; calibration weight 42; fixing structure 5; weighing pan 6; notch 60; windproof cover structure 7; upper structure 71; middle structure 72; lower structure 73; support foot 8. Detailed Implementation

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the specific implementation methods of this application will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without creative effort.

[0022] To keep the drawings concise, each drawing only schematically shows the parts relevant to the application; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" can mean not only "only one" but also "more than one."

[0023] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0024] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0026] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] Electronic balances are widely used in weighing gold and jewelry. In some applications, users often desire a balance that, while possessing weighing and internal calibration functions, is as small and lightweight as possible for easy placement and portability. Current electronic balances typically house sensors, internal calibration mechanisms, and weighing-related mounting structures within the casing. These components are mostly assembled using layered stacking or conventional top-to-bottom arrangements. While this arrangement meets basic weighing and calibration requirements, it often fails to achieve the desired overall slimness and miniaturization.

[0028] In one embodiment, refer to the appendix to the specification. Figure 1 , Figures 4 to 7 The electronic balance provided in this application includes a housing assembly 1, a support member 2, a weighing component 3, and an internal calibration component 4. The housing assembly 1 has an internal mounting cavity 11 for accommodating the various functional components inside the electronic balance. The support member 2 is disposed within the mounting cavity 11, and the support member 2 has a first clearance portion 21, which forms a clearance space 211 extending along the height direction.

[0029] The weighing assembly 3 includes a strain beam sensor 31, which is mounted on the support member 2, with at least a portion of the strain beam sensor 31 located within the clearance space 211. An internal calibration assembly 4 is disposed within the mounting cavity 11 and is used to calibrate the strain beam sensor 31; at least a portion of the internal calibration assembly 4 is also located within the clearance space 211.

[0030] Through the configuration of this embodiment, it can be understood that the carrier 2 is set in the installation cavity 11, and the symmetrical weight assembly 3 and the inner calibration assembly 4 play a certain supporting and bearing role. During assembly, the main structure of the electronic balance can be assembled on the carrier 2 first, and then simultaneously installed into the outer shell assembly 1 to ensure the standardization and uniformity of production.

[0031] Furthermore, a first clearance portion 21 is provided on the support member 2. While supporting the internal components, the support member 2 can also provide partial clearance space for the strain beam sensor 31 and the internal calibration assembly 4. In other words, both the strain beam sensor 31 and the internal calibration assembly 4 can be arranged using the clearance space 211 formed by the first clearance portion 21. This helps to reduce the space occupied by the relevant components in the height direction, improve the space utilization rate inside the mounting cavity 11, and make the overall thickness and size of the electronic balance thinner and smaller.

[0032] In some embodiments, the first clearance portion 21 can be configured as a recessed area on the support member 2, with the corresponding position of the support member 2 recessed to one side relative to the surrounding area to form a clearance space 211 extending in the height direction. At least a portion of the strain beam sensor 31 and the internal calibration assembly 4 are located within the clearance space 211, which can occupy the internal space after the partial recess of the support member 2, thereby reducing the stacking size of the relevant components in the height direction and facilitating the control of the overall thickness of the electronic balance.

[0033] The first clearance part 21 can also be configured as a hole, opening or partial hollow area opened on the carrier 2. These holes, openings or partial hollow areas can also form clearance space at the corresponding position of the carrier 2, so that at least part of the strain beam sensor 31 and the internal calibration component 4 can enter the clearance space, thereby releasing the installation height of the surrounding area of ​​the carrier 2 and improving the space utilization rate inside the installation cavity 11.

[0034] In some embodiments, the housing assembly 1 is further made of plastic, while the support member 2 is made of metal. This use of different materials for the housing assembly 1 and the support member 2 not only helps control the overall weight of the electronic balance but also ensures the structural stability of the areas related to weighing and calibration.

[0035] The outer shell assembly 1 is located on the outside of the electronic balance and is mainly used to form the overall shape of the machine and the mounting cavity 11. Using plastic material reduces the overall weight of the machine and facilitates the simultaneous formation of assembly structures such as clips, connecting columns, and positioning parts during molding. The support component 2 is set inside the mounting cavity 11. Components such as the strain beam sensor 31, support frame 32, and internal calibration assembly 4 can be installed or fitted onto the support component 2. Using metal material for the support component 2 provides better rigidity and dimensional stability, offering a more stable mounting foundation for the aforementioned components.

[0036] In this way, the outer structure of the electronic balance is mainly covered and assembled by plastic parts, while the internal components related to weighing and calibration are mainly installed on the metal support component 2. For small and thin electronic balances, this arrangement can control the overall weight and provide a relatively stable support foundation for components with high requirements for installation, such as the strain beam sensor 31 and the internal calibration component 4. This helps to reduce the impact of local deformation of the outer shell component 1 on the internal weighing components.

[0037] In one embodiment, see Appendix Figure 5 , Figure 6 , Figure 13 as well as Figure 14 The strain beam sensor 31 is fixedly mounted on the support member 2. The weighing assembly 3 also includes a support frame 32 and a weighing part 33. The support frame 32 includes a support body 321 and a side arm 322 extending from the support body 321 toward the support member 2. The support body 321 is provided with a first docking part 3211 and a second docking part 3212. The first docking part 3211 is connected to the force-bearing end of the strain beam sensor 31, and the second docking part 3212 is connected to the weighing part 33 to transfer the load borne by the weighing part 33 to the strain beam sensor 31.

[0038] Specifically, the support body 321 can be positioned above the strain beam sensor 31 along the height direction, and the side arm 322 extends from the support body 321 towards the support member 2, so that the support frame 32 is located entirely on the outer side of the strain beam sensor 31, thereby forming a certain range of cover structure above and around the strain beam sensor 31. In this way, when external liquids, dust, or other small impurities enter the electronic balance through the assembly gap of the outer shell assembly 1, the support body 321 can shield the liquid or dust from above, reducing the chance of it falling onto the surface of the strain beam sensor 31; the side arm 322 can provide lateral protection against impurities from the periphery, so that the liquid or dust comes into contact with the support frame 32 before approaching the strain beam sensor 31.

[0039] In practical applications, the specific coverage areas of the support body 321 and the side arm 322 can be adapted to the specifications of the strain beam sensor 31. For electronic balances with different ranges and accuracies, the strain beam sensors 31 used may differ in size and structural outline. The coverage area of ​​the support body 321 above the strain beam sensor 31, and the extension range of the side arm 322 around the strain beam sensor 31, can be adjusted accordingly.

[0040] Conversely, the internal space defined by the support body 321 and the side arm 322 can be set to be larger than the current strain beam sensor 31's outline, so that the inside of the support frame 32 still retains a certain margin after the current strain beam sensor 31 is installed. This margin can serve as an adaptation space to accommodate strain beam sensors 31 with larger dimensions.

[0041] like Figure 5 As shown, the weighing pan 6 of the electronic balance abuts against the weighing part 33 described above, and the weighing pan 6 is used to support the object to be measured. In some embodiments, such as Figure 3 As shown, a notch 60 is provided around the periphery of the weighing pan 6, and the notch 60 forms a visual reference benchmark in the horizontal direction.

[0042] When resetting the weighing pan 6 after assembly or cleaning, the operator can quickly determine the installation angle of the weighing pan 6 by observing the relative orientation of the notch 60 and the outer shell of the balance. For example, if the extension direction of the notch 60 is parallel to the length direction of the balance, the operator can ensure that the weighing pan 6 maintains the consistency of its circumferential orientation after multiple disassemblies and reassemblies, thus avoiding assembly position deviations caused by the rotation of the weighing pan 6.

[0043] During weighing operations, the notch 60 provides a clear orientation reference for placing the object to be measured. When placing the object, the operator can visually compare the relative position of the object to be measured with the notch 60, for example, using the notch 60 as a reference to determine the geometric center of the weighing pan 6. This allows for more accurate placement of the object in the central force-bearing area of ​​the weighing pan 6, effectively reducing the off-center load caused by the object deviating from the center, and improving the uniformity of force transmission and measurement accuracy of the strain beam sensor 31.

[0044] In some embodiments, reference may be made to the appendix. Figure 7 and Figure 13 The first docking part 3211 includes multiple sets of mounting holes 32111 distributed on the support body 321. The multiple sets of mounting holes 32111 have different hole spacing specifications to adapt to strain beam sensors 31 with different range specifications.

[0045] For electronic balances, the strain beam sensors 31 selected for different range specifications often have different installation dimensions. After multiple sets of mounting holes 32111 with different hole spacings are pre-set on the support body 321, the support frame 32 can be compatible with strain beam sensors 31 of different specifications.

[0046] In addition, shims, blocks or other structures can be provided between the strain beam sensor 31 and the carrier 2 to adjust the installation height and fit between the two.

[0047] In one embodiment, such as Figure 6 and Figure 13As shown, the side arm 322 is provided with a third docking part 32211, which is in transmission cooperation with the inner calibration component 4. In the calibration state, the inner calibration component 4 acts on the side arm 322 through the third docking part 32211 and applies a calibration load to the strain beam sensor 31 via the support frame 32.

[0048] For the entire weighing assembly 3, the support frame 32 is connected to the strain beam sensor 31 and the weighing part 33 through the first docking part 3211 and the second docking part 3212 respectively, and thus already undertakes the function of transmitting the weighing load. The third docking part 32211 is then set on the side arm part 322, and the calibration load of the inner calibration assembly 4 can also be transmitted to the strain beam sensor 31 through the same support frame 32. This eliminates the need for other intermediate parts, which helps to simplify the structure and reduce weight.

[0049] Furthermore, in this embodiment, the support frame 32 simultaneously participates in the transmission of both the weighing load and the calibration load. In the weighing state, the load borne by the weighing unit 33 is transmitted to the force-bearing end of the strain beam sensor 31 via the support body 321; in the calibration state, the internal calibration component 4 applies a calibration load to the support frame 32 via the side arm 322, and this calibration load is then transmitted to the strain beam sensor 31 via the support frame 32. Thus, both the weighing load and the calibration load act on the strain beam sensor 31 through the support frame 32. The support frame 32 is no longer just a connector between the weighing unit 33 and the strain beam sensor 31, but also serves as a loading and mating component for the internal calibration component 4. In this way, the weighing path and the calibration path can be completed on the same structural component, reducing the need for additional transition structures between the weighing component 3 and the internal calibration component 4, which helps to reduce the number of internal components and makes the fit between the weighing unit 33, the strain beam sensor 31, and the internal calibration component 4 more compact.

[0050] Furthermore, the third docking part 32211 is arranged on the downwardly extending side arm part 322, so that the application position of the calibration load is on the side of the support body 321, effectively avoiding the conventional weighing area directly above the support frame 32. There is no need to reserve additional top space for the movement trajectory of the internal calibration component 4, which is conducive to the thin design of the whole machine in the height direction.

[0051] The upper part of the support body 321 is mainly used to form a weighing engagement with the weighing unit 33 and the weighing pan 6, while the side arm 322 is used to receive the calibration load applied by the internal calibration component 4. In this way, the conventional weighing area and the internal calibration loading area are arranged separately on the support frame 32, and the operating space of the internal calibration component 4 can be arranged on the side or bottom of the support frame 32 without occupying the space above the support body 321. For electronic balances with a relatively small overall thickness, this arrangement helps to avoid excessive overlap between the internal calibration component 4, the weighing unit 33, and the weighing pan 6 in the height direction, and also makes it easier to house the internal calibration component 4 within the limited space around the strain beam sensor 31.

[0052] In some embodiments, the position of the third docking part 32211 on the side arm 322 can be set according to the arrangement position of the inner calibration component 4, the movement path of the loading end 41, and the position of the calibration load. For example, the third docking part 32211 can be set near the free end of the side arm 322, or it can be set in the transition area where the side arm 322 connects to the support body 321.

[0053] In this way, the mating position between the inner calibration component 4 and the support frame 32 can be adjusted according to the internal space and loading relationship, so that the loading end 41 can act smoothly on the third docking part 32211 in the calibration state, and transmit the calibration load to the support frame 32 through the side arm part 322. For inner calibration components 4 of different specifications, or support frames 32 of different sizes, the position of the third docking part 32211 can be adjusted to maintain a suitable transmission and mating relationship between the inner calibration component 4 and the side arm part 322.

[0054] In some embodiments, the side arm portion 322 includes a first side arm 3221 and a second side arm 3222. The first side arm 3221 and the second side arm 3222 are respectively connected to opposite sides of the support body 321. The first side arm 3221 is disposed close to the inner calibration component 4, and the second side arm 3222 is disposed away from the inner calibration component 4. A third docking portion 32211 is disposed on the first side arm 3221 for docking with the loading end 41 of the inner calibration component 4.

[0055] Understandably, the internal calibration component 4 includes a loading end 41 and a calibration weight 42. The loading end 41 carries the calibration weight 42, and in the calibration state, the loading end 41 drives the calibration weight 42 to move along the height direction. In this way, the internal calibration component 4 can drive the calibration weight 42 into the calibration position through the loading end 41, and apply the load corresponding to the calibration weight 42 to the first side arm 3221 via the third docking part 32211, and then transfer it to the strain beam sensor 31 through the support frame 32. Among them, the calibration weight 42 is mainly used to provide the calibration load, and the loading end 41 is mainly used to drive the calibration weight 42 to change position.

[0056] It should be noted that the internal calibration component 4 generally includes a drive component 40 and a transmission mechanism. The power output end of the drive component 40 is connected to the transmission mechanism, which serves as the intermediate transmission medium, and its execution end is the aforementioned loading end 41.

[0057] When entering the calibration state, the drive component 40 outputs power, and the transmission mechanism, driven by the power, guides the loading end 41 and the calibration weight 42 to move downward along the height direction until the gravity of the calibration weight 42 is fully applied to the third docking part 32211 of the first side arm 3221, thus completing the application of the calibration load. When exiting the calibration state and resuming normal weighing, the drive component 40 unloads the power or performs a reset operation, which can drive the loading end 41 and the calibration weight 42 to rise back to their original positions.

[0058] In one embodiment, based on the above design, the second side arm 3222 is provided with a first limiting part 32221, and the bearing member 2 is provided with a second limiting part 24. The first limiting part 32221 and the second limiting part 24 are arranged opposite to each other in the height direction. When the support frame 32 is displaced to the limit position in the height direction, the first limiting part 32221 and the second limiting part 24 abut against each other, thereby restricting the movement of the support frame 32 in the height direction.

[0059] Understandably, the support frame 32 can move within a certain range during normal weighing or calibration. When the support frame 32 moves too much, the abutment between the first limiting part 32221 and the second limiting part 24 can limit the support frame 32 to a certain extent.

[0060] Specifically, such as Figure 7 and Figure 14 As shown, when the support frame 32 moves to its limit position in the direction away from the carrier 2, the first limiting part 32221 abuts against the second limiting part 24, thereby restricting the support frame 32 from continuing to move upward. In this way, when the support frame 32 shows an upward lifting tendency, the first limiting part 32221 and the second limiting part 24 can form a relative limit, preventing the support frame 32 from moving further upward relative to the carrier 2, thereby preventing the support frame 32 from falling out of the corresponding installation position.

[0061] Furthermore, in some embodiments, the second limiting portion 24 on the carrier 2 is configured as an adjustable structure. For example... Figure 7 As shown, the second limiting part 24 includes a connecting post 241 and a connecting screw 242. By turning the connecting screw 242, the position of the second limiting part 24 in the height direction can be adjusted to adapt to different scenarios, thereby ensuring that the support frame 32 forms a reliable limit when it moves upward to the predetermined position.

[0062] Based on the above structure, the support frame 32 can simultaneously serve as a local protection and limiting mechanism. The support body 321 is positioned above the strain beam sensor 31, and the side arm 322 extends towards the carrier 2, forming a shielding area above and around the strain beam sensor 31, reducing the possibility of liquids, dust, or fine impurities falling directly into the vicinity of the strain beam sensor 31. The first limiting part 32221 on the second side arm 3222 can cooperate with the second limiting part 24 on the carrier 2, creating a limit when the support frame 32 moves upward to a predetermined position, preventing the support frame 32 from continuing to move upward relative to the carrier 2. Thus, in addition to transmitting weighing and calibration loads, the support frame 32, in conjunction with its support body 321, side arm 322, and limiting structure, can provide local protection for the strain beam sensor 31 and constrain the range of motion of the support frame 32, which helps reduce the need for separate protective and limiting components inside the electronic balance.

[0063] In one embodiment, the second docking portion 3212 is disposed on the top surface of the support body 321, and the top surface of the support body 321 is also provided with a protective structure. For example... Figure 13 As shown, the protective structure includes a protective groove 3213 surrounding the second docking part 3212. The opening of the protective groove 3213 faces the side where the weighing part 33 mates with the weighing pan 6 of the electronic balance, thereby forming a space around the second docking part 3212 for trapping impurities. The protective groove 3213 and the second docking part 3212 are spaced apart and not connected, forming a physical isolation.

[0064] Understandably, a sunken area is enclosed around the second docking part 3212 by the protective groove 3213. When fine particles, powders or droplets falling from one side of the weighing pan 6 approach the second docking part 3212, they will preferentially enter the accommodating space corresponding to the protective groove 3213. This makes it less likely for impurities to accumulate directly near the second docking part 3212, and also reduces the possibility of impurities continuing to enter the lower structure along the mating position of the second docking part 3212 and the weighing part 33.

[0065] Furthermore, such as Figure 8 As shown, the second docking part 3212 includes an insertion hole 32121 formed on the support body 321, and the weighing part 33 includes a mating post 331 provided at one end of it, which is inserted and fixed in the insertion hole 32121. During assembly, the mating post 331 is aligned with the insertion hole 32121 and inserted downwards to complete the corresponding installation between the weighing part 33 and the support frame 32, which is relatively simple and facilitates the replacement of components such as the weighing pan 6 above.

[0066] Based on this, the protective groove 3213 is arranged around the edge of the insertion hole 32121, which can form a barrier around the insertion hole 32121, so that impurities are preferentially retained in the protective groove 3213, which protects the insertion area between the insertion hole 32121 and the mating post 331, and also facilitates the subsequent cleaning of impurities.

[0067] Furthermore, the shape of the mating post 331 can be customized according to the needs of the insertion assembly. For example, the end of the mating post 331 furthest from the weighing part 33 can form a relatively small guide section, while the side closer to the weighing part 33 can form a larger mating section. In this way, during assembly, the guide section can first enter the insertion hole 32121, providing initial guidance and facilitating the alignment of the mating post 331 with the insertion hole 32121. As insertion continues, the larger mating section then forms a corresponding fit with the insertion hole 32121, thereby improving the connection stability after insertion. The mating post 331 and the insertion hole 32121 can also be configured with interference fit, clearance fit, or other forms as needed, or further fixed by adhesive bonding, snap-fitting, or other methods, as long as the weighing part 33 can be stably mounted on the support frame 32.

[0068] In some embodiments, such as Figure 13 As shown, the protective structure also includes a guide surface 3214, which is disposed on the outside of the protective groove 3213. The guide surface 3214 extends downward at an angle from the side close to the protective groove 3213 away from the protective groove 3213. For powder or liquid falling into this area, the guide surface 3214 can provide a guiding path extending away from the protective groove 3213, so that impurities move outward along the guide surface 3214 under the action of gravity, and are less likely to continue to stay in the position close to the protective groove 3213 or the second docking part 3212.

[0069] In the attached figure, the guide surface 3214 has an arc-shaped profile. Thus, the guide surface 3214 transitions smoothly from the side close to the protective groove 3213 to the side away from the protective groove 3213. After impurities fall onto the guide surface 3214, they can move outward along the arc-shaped surface. It should be noted that the guide surface 3214 is not limited to an arc-shaped profile. It can also be set as an inclined plane, a broken line transition surface, a curved surface transition surface, or other structures that can form an outward guiding trend.

[0070] In one embodiment, the outer casing assembly 1 includes a top shell 12 and a bottom shell 13, which together form an installation cavity 11. The support member 2 is disposed between the top shell 12 and the bottom shell 13. The weighing assembly 3 and the internal calibration assembly 4 are respectively disposed on the side of the support member 2 facing the top shell 12, reducing the dispersed arrangement of components inside the casing and facilitating the integrated installation of the internal structure of the entire machine.

[0071] Understandably, in this embodiment, the top shell 12 and the bottom shell 13 are separately configured. During assembly, they correspond vertically along the height direction and form an installation cavity 11 after being closed. The support member 2 is disposed between the top shell 12 and the bottom shell 13. The weighing component 3 and the inner calibration component 4 are pre-installed on the support member 2, thus forming a corresponding component assembly together with the support member 2. During assembly, the support member 2 and the weighing component 3 and the inner calibration component 4 installed on the support member 2 can be inserted into the bottom shell 13 from one side of the top shell 12, and then the assembly of the outer shell component 1 is completed by the cooperation between the top shell 12 and the bottom shell 13.

[0072] By adopting this stacked assembly method, the carrier 2 and the components can be installed as a whole, making the assembly logic clearer and facilitating the control of the corresponding positions of each component inside the housing.

[0073] In some embodiments, a positioning structure 14 is further provided between the top shell 12, the bottom shell 13, and the support member 2, for example, an attachment. Figure 12 In this assembly, the positioning structure 14 between the carrier 2 and the bottom shell 13 uses a combination of positioning pins and positioning holes. Of course, other similar structures can be used in other embodiments. When the carrier 2 and its corresponding component assemblies are installed into the bottom shell 13, the positioning structure 14 can guide and initially position them, allowing the carrier 2 to gradually enter the predetermined position during assembly and reducing installation offset. Furthermore, when the top shell 12 and the bottom shell 13 are closed, the corresponding positioning structure 14 can continue to constrain the carrier 2 and internal components, resulting in more uniform assembly quality.

[0074] In one embodiment, refer to Appendix Figure 4 , Figure 5 , Figure 9 The support member 2 includes a main base plate 22, and a first clearance portion 21 is disposed in a local area of ​​the main base plate 22. Specifically, the first clearance portion 21 includes a side wall 212 and a bottom wall 213. The side wall 212 extends from the main base plate 22 toward the bottom shell 13, and the bottom wall 213 is connected to the side edge of the side wall 212 away from the main base plate 22. Thus, the first clearance portion 21 forms a local recessed structure relative to the main base plate 22. The side wall 212 and the bottom wall 213 together enclose a clearance space 211.

[0075] Understandably, in addition to the basic support surface provided by the main base plate 22, the carrier 2 also forms a receiving part with a sinking depth in the corresponding area. The strain beam sensor 31 and the internal calibration component 4 are arranged in this part, so that the above components spatially overlap with the structure of the carrier 2 in the height direction. This allows the internal height space of the outer shell component 1 to be utilized to the maximum extent without reducing the size of the strain beam sensor 31 itself (i.e. without sacrificing the balance range and measurement accuracy), thereby significantly reducing the overall size of the machine in the height direction and meeting the design requirements of thinness and compactness of high-precision electronic balance.

[0076] On the other hand, the side walls 212 are connected to the bottom wall 213 and the main base plate 22 respectively. In specific implementations, the side walls 212 can be vertically set between the main base plate 22 and the bottom wall 213 to maximize the effective horizontal accommodating area of ​​the clearance space 211, facilitating the compact arrangement of internal components. Of course, in some embodiments, such as the design in the attached figure, the side walls 212 are inclined between the main base plate 22 and the bottom wall 213. Through the transition of the side walls 212, the load-bearing member 2 is transformed from a conventional planar structure into a partially sunken three-dimensional structure. The side walls 212 can play a certain role in resisting bending when subjected to force, thereby significantly improving the bending stiffness and torsional stiffness of the load-bearing member 2.

[0077] In specific settings, the connection between the main base plate 22 and the side wall 212 can be set as a rounded transition, chamfered transition or other smooth transition form, which is convenient for the forming and processing of the bearing component 2, and also facilitates the improvement of the stress transition in the area surrounding the first avoidance part 21.

[0078] like Figure 9 As shown, in some embodiments, the support member 2 further includes a side support wall 23, which extends from the edge of the main body base plate 22 toward the top shell 12 to form an upwardly extending limiting edge on the side of the support member 2. When the component disposed on the support member 2 approaches the edge area of ​​the main body base plate 22, it can be restricted and constrained by the side support wall 23.

[0079] In one embodiment, refer to Appendix Figure 4 , Figure 9 and Figure 10 A gap A is left between the bottom wall 213 and the bottom shell 13. A through hole 2131 is provided on the bottom wall 213 along the height direction. The fixing structure 5 in the weighing component 3 and / or the inner calibration component 4 passes through the corresponding through hole 2131, extends into the gap A, and is fixed to the side surface of the bottom wall 213 away from the top shell 12.

[0080] This configuration effectively moves the fixing position from above the bottom wall 213 to below the bottom wall 213. The space above the bottom wall 213 can be used more for the main body of the functional components, such as the weighing assembly 3 and the internal calibration assembly 4. The fixing structure 5 passes through the through hole 2131 and is fixed on the side of the bottom wall 213 away from the top shell 12, so that the fixing part of the weighing assembly 3 and / or the internal calibration assembly 4 is located below the bottom wall 213, while the main body of the components is located above the bottom wall 213 or within the clearance space 211. This further reduces the height of the weighing assembly 3 and the internal calibration assembly 4 relative to the carrier 2, providing the necessary structural support for the overall thin and light design of the machine.

[0081] It should be noted that the gap A between the bottom wall 213 and the bottom shell 13 can be set only in certain local areas corresponding to the fixing structure 5, to accommodate the portion of the fixing structure 5 located on the back side of the bottom wall 213 after it passes through the through hole 2131. In other words, the gap A does not necessarily need to be continuously set along the entire range of the bottom wall 213. Designers can form the gap A at the location where back-side fixing is required, and in other locations, the bottom wall 213 abuts against the bottom shell 13. In this way, the installation requirements of the fixing structure 5 can be met, and the overall distance between the bottom wall 213 and the bottom shell 13 can be easily controlled, avoiding excessive empty space in non-installation areas.

[0082] In some embodiments, at least a portion of the bottom surface of the main body base plate 22 abuts against at least a portion of the structure of the bottom shell 13 and is fixedly connected to it. The abutment and fixing position of the main body base plate 22 and the bottom shell 13 is located on the periphery of the first clearance portion 21. Specifically, the mounting portion between the support member 2 and the bottom shell 13 falls in the peripheral area of ​​the first clearance portion 21, and the support member 2 and the bottom shell 13 form support and fixation in the peripheral area. The middle area corresponding to the first clearance portion 21 retains a sunken structural form.

[0083] Through the above design, after the support component 2 is installed in place, the outer area first forms a stable support, and the middle area is used to accommodate the strain beam sensor 31, the internal calibration component 4 and related structures. This makes it easier to compress the assembly space inside the whole machine and reduce the mutual occupation of the connecting structure and the functional structure in the same area. Therefore, the internal layout can be made more compact.

[0084] In one embodiment, in conjunction with the foregoing and appendix Figure 11 , Figure 12 The bottom shell 13 is provided with a second clearance part 131 at the position corresponding to the first clearance part 21. The second clearance part 131 protrudes in a direction away from the top shell 12, thereby forming a partially concave structure on the bottom shell 13. The second clearance part 131 and the first clearance part 21 are stacked in the height direction, and the bottom wall 213 is spaced apart from the second clearance part 131.

[0085] Thus, the partial recessed space formed by the first clearance part 21 on one side of the support member 2 and the partial recessed space formed by the second clearance part 131 on one side of the bottom shell 13 can form a corresponding upper and lower fit at the same position, and there is also further space below the bottom wall 213, which can prevent the base and the bottom wall 213 from bumping against each other.

[0086] Furthermore, such as Figure 2 As shown, the electronic balance is usually supported on the table by the support feet 8, and there is a certain distance between the bottom of the bottom shell 13 and the table. With the design of this application, the second clearance part 131 protrudes away from the top shell 12, which can utilize the original space between the bottom shell 13 and the table, so that the downward protruding part of the bottom shell 13 falls into the bottom clearance formed by the support feet 8.

[0087] In other words, although the second clearance part 131 is set on the bottom shell 13, it mainly occupies the space that can be used below the bottom shell 13 and does not increase the overall height of the machine. This approach is beneficial to make room for the internal components to be arranged in a lower position without significantly increasing the external occupation of the bottom shell 13, making it easier to make the overall structure of the electronic balance thinner and more compact.

[0088] The recessed depth of the second clearance portion 131 can be set according to the effective height formed by the support foot 8, and no specific limitation is made in this application.

[0089] In some embodiments, the electronic balance also includes a windproof shield structure 7 surrounding the weighing pan 6.

[0090] As attached Figures 1 to 3 The windproof cover structure 7 includes an upper structure 71, a middle structure 72, and a lower structure 73. The upper structure 71 can be understood as a cover, which forms an opening for placing the object to be measured on the weighing pan 6 or removing it. The middle structure 72 can be understood as the main cover, which surrounds the outer side of the weighing pan 6 to form a relatively enclosed protective space around it. The lower structure 73 is mounted on the top shell 12 of the electronic balance, thus placing the entire windproof cover structure 7 around the outer periphery of the weighing pan 6. In this way, the corresponding area of ​​the weighing pan 6 can be surrounded by the windproof cover structure 7, reducing the disturbance of external airflow to the weighing pan 6 and the object to be measured, and improving the stability and accuracy of weighing.

[0091] Furthermore, the middle structure 72 can be made of a transparent material, such as an acrylic tube. This allows the main cover to not only surround the weighing pan 6 but also facilitate direct observation of the weighing pan 6, the object to be measured, and the corresponding states during the weighing process from the outside. Additionally, the segmented form of the upper structure 71, middle structure 72, and lower structure 73 described above is only one embodiment. The windproof cover structure 7 can also be a one-piece structure, a two-section structure, or other structural forms that can create a windproof area around the weighing pan 6; these will not be elaborated upon in this application.

[0092] It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of this application. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. An electronic balance, characterized in that, include: The housing assembly has an internal mounting cavity; A support member is disposed within the mounting cavity. The support member is provided with a first clearance portion, which forms a clearance space extending along the height direction. A weighing assembly includes a strain beam sensor, a weighing part, and a support frame. The strain beam sensor is mounted on the carrier, and at least a portion of the strain beam sensor is located within the clearance space. The support frame includes a support body and a side arm extending from the support body toward the carrier. The support body is connected to the weighing part and the force-bearing end of the strain beam sensor to transmit the weighing load. as well as An internal calibration component is disposed within the mounting cavity. The internal calibration component is used to calibrate the strain beam sensor, and at least a portion of the internal calibration component is located within the clearance space. The internal calibration component is driven to engage with the side arm to apply a calibration load to the strain beam sensor through the side arm in the calibration state.

2. The electronic balance according to claim 1, characterized in that, The supporting body is provided with a first docking part and a second docking part, and the first docking part and the second docking part are distributed at intervals on the supporting body; The support frame is connected to the force-bearing end of the strain beam sensor via the first docking part, and the weighing part is connected to the second docking part. The weighing load borne by the weighing part is transmitted to the force-bearing end of the strain beam sensor in sequence via the second docking part, the support body and the first docking part.

3. The electronic balance according to claim 2, characterized in that, The side arm includes a first side arm and a second side arm, which are respectively connected to opposite sides of the support body; The first side arm is positioned close to the inner calibration component, and a third docking part is provided on the first side arm. The execution end of the inner calibration component is in transmission cooperation with the third docking part.

4. The electronic balance according to claim 3, characterized in that, The second side arm is provided with a first limiting part, and the bearing member is provided with a second limiting part; The first limiting part and the second limiting part are arranged opposite to each other in the height direction and have a limiting gap. When the support frame is displaced to the limit position in the height direction, the first limiting part and the second limiting part abut against each other to limit the displacement of the support frame in the height direction.

5. The electronic balance according to claim 2, characterized in that, The top surface of the support body is provided with a protective structure, the protective structure including a protective groove surrounding the second docking part, the protective groove and the second docking part being spaced apart and not communicating with each other; The electronic balance has a weighing pan, and the opening of the protective groove faces the side of the weighing part that mates with the weighing pan, so as to form a space for trapping impurities.

6. The electronic balance according to claim 5, characterized in that, The protective structure also includes a guide surface, which is disposed on the outside of the protective groove; The guide surface extends downward at an angle from the side closest to the protective groove toward the side away from the protective groove, and is used to guide impurities falling on the guide surface to move toward the periphery of the support frame.

7. The electronic balance according to claim 5 or 6, characterized in that, The second docking part includes an insertion hole opened on the support body, and the weighing part includes a mating post disposed at one end thereon. The mating post is inserted and fixed in the insertion hole, and the outer peripheral wall of the mating post is in contact with the inner wall of the insertion hole. The protective groove is arranged around the outer periphery of the insertion hole.

8. The electronic balance according to any one of claims 2-6, characterized in that, The first docking part includes multiple sets of mounting holes distributed on the support body. The multiple sets of mounting holes have different hole spacing specifications to adapt to the installation and positioning of strain beam sensors with different range specifications.

9. The electronic balance according to claim 1, characterized in that, The housing assembly includes a top shell and a bottom shell, which together form the mounting cavity; The support member is disposed between the top shell and the bottom shell, the weighing component and the inner calibration component are respectively disposed on the side of the support member facing the top shell, and at least a portion of the weighing component and the inner calibration component are located within the clearance space.

10. The electronic balance according to claim 9, characterized in that, The support member includes a main base plate, and the first clearance portion includes a side wall and a bottom wall. The side wall extends from the main base plate toward the bottom shell, and the bottom wall is connected to the side edge of the side wall away from the main base plate. The first clearance portion forms a recessed structure relative to the main body base plate, and the side wall and the bottom wall together enclose the clearance space.

11. The electronic balance according to claim 10, characterized in that, There is a gap between the bottom wall and the bottom shell, and a through hole is provided on the bottom wall along the height direction. The weighing component and / or the internal calibration component also includes a fixing structure. The fixing structure extends into the gap through the through hole and is fixed to the side surface of the bottom wall opposite to the top shell. And / or, The support member also includes a side support wall, which extends from the edge of the main body bottom plate toward the direction close to the top shell; And / or, The bottom shell is provided with a second clearance portion corresponding to the position of the first clearance portion. The second clearance portion protrudes away from the top shell to form a partially recessed structure on the bottom shell. The second clearance portion and the first clearance portion are stacked on top of each other in the height direction. The bottom wall and the second clearance portion are spaced apart from each other. And / or, At least a portion of the bottom surface of the main body base plate abuts against and is fixed to at least a portion of the structure of the bottom shell, and the abutment and fixing position of the main body base plate and the bottom shell is located on the periphery of the first clearance portion.

12. The electronic balance according to any one of claims 1-6 and 9-11, characterized in that, The outer shell assembly is made of plastic, and the support component is made of metal.

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