Weighing pan assembly and electronic balance
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- METTLER TOLEDO INSTR SHANGHAI
- Filing Date
- 2024-02-28
- Publication Date
- 2026-05-06
Smart Images

Figure CN2024078944_02012025_PF_FP_ABST
Abstract
Description
WEIGHING PAN ASSEMBLY AND ELECTRONIC BALANCEBACKGROUND OF THE INVENTIONTechnical Field
[0001] The present invention relates to the field of weighing, and in particular, to the field of electronic balances.
[0002] Background Art
[0003] An electronic balance includes an air shield system, a balance shell, and a weighing pan system. Different balance sensors require weighing pans and weighing pan supports that have different weights. Usually, a specific balance sensor needs a specific weighing pan and weighing pan support structure. Weighing pan supports and weighing pans of state-of-the-art balances are fixed by pasting glue, wherein some balances further meet weighing requirements of balance sensors by pasting balance weights.
[0004] The above method has various drawbacks. For example, there is a proneness to disconnection of elements fixed to each other by use of an adhesive due to chemical decomposition, so that there is insufficient reliability. Further, there is need for a special tooling fixture when using an adhesive process, which leads to low production efficiency and also increases labor costs. Finally, a weighing pan and a weighing pan support can only adapt to one type of balance sensor if an adhesive process is used, and hence are not universal and inconvenient to use, resulting also in a waste.SUMMARY
[0005] An objective of the present invention is to provide a weighing pan assembly in which a clump weight can be mounted in a reliable and stable manner, wherein the clump weight is replaceable nevertheless.
[0006] To achieve the above objective, the weighing pan assembly includes a weighing pan and a weighing pan support that are stacked, and further includes a clump weight arranged between the weighing pan and the weighing pan support in a replaceable manner, wherein the clump weight includes a notched portion and a non-notched portion that are located on the clump weight; and the weighing pan support includes an elastic limiting structure, wherein the notched portion is configured to engage with the elastic limiting structure to limit the clump weight, and the non-notched portion is configured to squeeze the elastic limiting structure to allow the clump weight to be movable.
[0007] In one or more embodiments, the elastic limiting structure includes an elastic member and a limiting member connected to the elastic member.
[0008] In one or more embodiments, a bottom surface of the non-notched portion is configured to be capable of squeezing the limiting member to apply a pressure to the elastic member in an axial direction of the clump weight.
[0009] In one or more embodiments, an outer side surface of the non-notched portion is configured to be capable of squeezing the limiting member to apply a pressure to the elastic member in a radial direction of the clump weight.
[0010] In one or more embodiments, the elastic member is an elastic cantilever beam.
[0011] In one or more embodiments, the notched portion includes an inlet channel and an internal chamber, and a maximum width of a cross section of the inlet channel is slightly less than a minimum width of the limiting member, so that the limiting member is capable of engaging with the internal chamber via the inlet channel.
[0012] In one or more embodiments, the notched portion includes an arc-shaped surface that comes into contact with the limiting member.
[0013] In one or more embodiments, the weighing pan support further includes a positioning structure that is located above the clump weight supported on the weighing pan support and is configured to fix the clump weight together with a bottom surface of the weighing pan support.
[0014] In one or more embodiments, the positioning structure has a shape complementary to that of the notched portion, or a cross-sectional area of the positioning structure is less than a notch cross-sectional area of the notched portion.
[0015] In one or more embodiments, the positioning structure is arranged on a path of mounting the clump weight to the weighing pan support, and designed to guide the mounting of the clump weight by cooperation between the positioning structure and the notched portion during the mounting.
[0016] In one or more embodiments, the weighing pan support further includes a fixing structure, and the fixing structure is configured to apply a pre-tightening force to the weighing pan to keep the weighing pan and the weighing pan support in a relatively stable state.
[0017] In one or more embodiments, the fixing structure applies a radial pre-tightening force to a circumferential side surface of the weighing pan.
[0018] In one or more embodiments, the weighing pan includes a horizontal disc surface, the circumferential side surface, and an inclined side surface, the circumferential side surface is connected to the horizontal disc surface by the inclined side surface, and the fixing structure applies a pre-tightening force to the inclined side surface.
[0019] In one or more embodiments, the fixing structure includes an elastic portion and a limiting portion, and the limiting portion includes a cambered surface for matching a surface of the weighing pan.
[0020] In one or more embodiments, the elastic portion is a cantilever beam, and the limiting portion is a limiting bead.
[0021] In one or more embodiments, the weighing pan further includes a groove with which the limiting portion engages to limit the movement of the weighing pan.
[0022] In one or more embodiments, the weighing pan assembly includes a batch of clump weights with different shapes and / or thicknesses and / or materials, and any one of the clump weights is arranged between the weighing pan and the weighing pan support in a replaceable manner.
[0023] Another objective of the present invention is to provide an electronic balance, which includes an air shield system and a balance shell, characterized in that the electronic balance includes the weighing pan assembly disclosed above.
[0024] In the above weighing pan assembly, through the design of the elastic limiting structure, the notched portion and the non-notched portion, and in cooperation with the movement of the clump weight in the weighing pan support, the elastic limiting structure effects fixing and unfixing the clump weight when it interacts with the notched portion and the non-notched portion, respectively. Further, the risk of proneness to disconnection caused by a conventional adhesive can be avoided by using the elastic limiting structure being engaged with the notched portion, and the clump weight can be stably mounted with the weighing pan and the weighing pan support. When the elastic limiting structure cooperates with the non-notched portion, removal of the clump weight can be achieved, and the balance weight performance of the weighing pan assembly can be adjusted through the replacement of the clump weight, so that the weighing pan assembly is more universal and able to meet various weighing requirements of the electronic balance.BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The above and other features, properties and advantages of the present invention will become more apparent from the following description with reference to accompanying drawings and embodiments, in which:
[0026] FIG. 1 is an external schematic diagram of an electronic balance;
[0027] FIG. 2 is a schematic diagram of a partially disassembled electronic balance;
[0028] FIG. 3 is a schematic diagram of an exemplary embodiment of a weighing pan assembly in disassembled state;
[0029] FIG. 4 is a schematic diagram of a clump weight and a weighing pan support in a relatively fixed state;
[0030] FIG. 5 is a side cross-sectional view of an exemplary embodiment of a weighing pan assembly;
[0031] FIG. 6 is a partial enlarged view of a part C of FIG. 5 of a weighing pan; and
[0032] FIG. 7 is a schematic diagram of an embodiment of an inlet channel of a notched portion.
[0033] List of reference numerals 10 Air shield system 20 Balance shell 30 Weighing pan assembly 301 Weighing pan 302 Clump weight 304 Elastic limiting structure 305 Positioning structure 306 Weighing pan support 307 Fixing structure 3011 Groove 3012 Horizontal disc surface 3013 Circumferential side surface 3014 Inclined side surface 3021 Notched portion 3022 Non-notched portion 3028 Internal chamber 3029 Inlet channel 3041 Elastic member 3042 Limiting member 3066 Protruding table 3067 Recess 3068 Bottom surface 3069 Side wall 3071 Elastic portion 3072 Limiting portionDETAILED DESCRIPTION OF EMBODIMENTS
[0034] The present invention will be further explained below with reference to the specific embodiments and accompanying drawings. In the following descriptions, more details are illustrated to facilitate a full understanding of the present invention, but it is clear that the present invention can be implemented in a variety of ways different from this description, and those skilled in the art can make similar extensions and interpretations based on practical applications without departing from the intention of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of the specific embodiments.
[0035] It should be noted that these and other subsequent accompanying drawings are only examples, are not drawn according to the conditions of equal scale, and should not be used as a limit to the scope of protection actually required by the present invention.
[0036] As shown in FIGS. 1 and 2, an electronic balance includes an air shield system 10, a balance shell 20, and a weighing pan assembly 30. A conventional weighing pan assembly includes a weighing pan, a weighing pan support, and a clump weight fixed by pasting glue. Using an adhesive process, there is a proneness to disconnecting, releasing etc., due to chemical decomposition, so that there is insufficient reliability. In addition, after the clump weight is pasted, the weighing pan, the weighing pan support and the clump weight generally cannot be disassembled, so that the weighing pan, the weighing pan support and the clump weight have unchanged balance weight parameters, and can only be applied to one type of balance sensor, thereby having no universality.
[0037] The weighing pan assembly described in the present disclosure is used to solve the above problems. Referring to FIGS. 3 to 5, the weighing pan assembly 30 includes a weighing pan 301 and a weighing pan support 306 that are stacked, and further includes a clump weight 302 arranged between the weighing pan 301 and the weighing pan support 306 in a replaceable manner. As shown in FIG. 3, the weighing pan support 306 includes a bottom surface 3068 and a side wall 3069, and a recess 3067 in the bottom surface 3068 adjacent to the side wall 3069. The clump weight 302 is arrangeable in the recess 3067, and the weighing pan 301 is located above the weighing pan support 306 and the clump weight 302. The weighing pan support 306 includes an elastic limiting structure 304.
[0038] The clump weight 302 includes a notched portion 3021 and a non-notched portion 3022 that are located on the clump weight. The notched portion 3021 and the non-notched portion 3022 may be located at an edge of the clump weight 302, as shown in FIG. 3, or may be located at other positions such as a disc surface of the clump weight 302. The notched portion 3021 is configured to engage with the elastic limiting structure 304 to limit the clump weight 302, and the non-notched portion 3022 is configured to squeeze the elastic limiting structure 304 to allow the clump weight 302 to be movable and thus prevent the elastic limiting structure 304 from limiting the clump weight 302.
[0039] The term "movement" includes, but is not limited to, changing the position of the clump weight in the form of "rotation" and "translation" . Those skilled in the art can understand that other movement methods that can change the original position, such as shifting, insertion, extension, translation, etc., all can be applied to the present disclosure. For example, the non-notched portion 3022 squeezes the elastic limiting structure 304 so that the clump weight 302 can "rotate" or "translate" or "shift" in the recess 3067.
[0040] Specifically, during the mounting of the clump weight 302, the elastic limiting structure 304 comes into contact with the non-notched portion 3022, and the elastic limiting structure 304 is squeezed by the non-notched portion 3022 to leave the position in a natural state to allow the clump weight 302 to moves in the recess 3067 on the weighing pan support 306; and when the elastic limiting structure 304 is out of contact with the non-notched portion 3022 and enters the notched portion 3021, the elastic limiting structure 304 is released from the external squeezing force, and is restored by means of the elastic force and engaged with the notched portion 3021 to limit the movement of the clump weight 302 and fix the clump weight 302 on the weighing pan support 306.
[0041] In some embodiments, the elastic limiting structure 304 includes an elastic member 3041 and a limiting member 3042 connected to the elastic member 3041. The elastic member 3041 may be an elastic cantilever beam or a spring, so that the limiting member 3042 can be displaced when the elastic member 3041 is squeezed, and can also be restored when an external force disappears.
[0042] Based on the above embodiment, in a first force application manner, the non-notched portion 3022 may squeeze the limiting member 3042 in an axial direction S by means of its own bottom surface to apply a pressure to the elastic member 3041 in the axial direction S, and press the elastic limiting structure 304 down on the entire bottom of the clump weight 302. During the rotation of the clump weight 302, the elastic limiting structure 304 will be out of contact with the non-notched portion 3022 and cooperate with the notched portion 3021, and the limiting member 3042 will be restored under an elastic restoring force of the elastic member 3041 and be lifted to an interior of the notch to limit the clump weight 302.
[0043] Based on the above embodiment, in a second force application manner, the non-notched portion 3022 may squeeze the limiting member 3042 in a radial direction of the clump weight 302 by means of its own outer side surface to apply a pressure to the elastic member 3041 in the radial direction and push the elastic limiting structure 304 outwards to a radial outer side of the clump weight 302. During the rotation of the clump weight 302, when the elastic limiting structure 304 is out of contact with the non-notched portion 3022, that is, when the elastic limiting structure 304 cooperates with the notched portion 3021, the limiting member 3042 is restored under the elastic restoring force of the elastic member 3041 and is restored radially inwards to the interior of the notch to limit the clump weight 302.
[0044] The limiting member 3042 may be of various structures for engaging or locking and limiting, such as a limiting protruding column, a limiting boss or a limiting sphere. By using the above elastic limiting structure, the clump weight 302 can be fixed to the weighing pan support 306, and functions of being detachable and replaceable may be further realized to meet actual use requirements.
[0045] In some embodiments, the notch shape of the notched portion 3021 may be semicircular as shown in FIG. 3, and at this time, the radial inner side surface of the notched portion 3021 that comes into contact with the limiting member 3042 is an arc-shaped surface, so that when the notch and the limiting member 3042 come into contact and move relative to each other, the resistance can be reduced to facilitate the rotation.
[0046] In some other embodiments, as shown in FIG. 7, the notched portion 3021 includes an inlet channel 3029 and an internal chamber 3028, and a maximum width of a cross section of the inlet channel 3029 is slightly less than a minimum width (e.g., a diameter of a spherical limiting bead) of the limiting member 3042, so that the limiting member 3042 can be engaged with the internal chamber 3028 by squeezing the inlet channel 3029, thereby improving the limiting effect on the clump weight 302 when the limiting member 3042 is engaged with the internal chamber 3028, and preventing the limiting member 3042 from accidentally falling off the notched portion 3021. In this way, the fit between the limiting member 3042 and the notched portion 3021 keeps the stable connection relationship between the clump weight 302 and the weighing pan support 306. It can be understood by those skilled in the art that the shape of the notched portion 3021 includes but is not limited to that in the above embodiment, and other notch shapes that can engage with or lock the limiting member 3042 can be applied to the present disclosure.
[0047] Still referring to FIGS. 3 and 4, the weighing pan support 306 further includes a positioning structure 305, and the positioning structure 305 is located above the clump weight 302 supported on the weighing pan support 306 and fixes the clump weight 302 together with a bottom surface of the weighing pan support in a vertical direction.
[0048] The positioning structure 305 functions to press the clump weight 302 from above. As shown in FIG. 3, the positioning structure 305 has a shape complementary to and fitting with that of the notched portion 3021; or a cross-sectional area of the positioning structure 305 is less than a notch cross-sectional area of the notched portion 3021, provided that the function of limiting and fixing is achieved above the clump weight.
[0049] In one embodiment, the weighing pan 301 and the weighing pan support 306 are in a separable state, when the clump weight 302 is mounted to the weighing pan support 306 from top to bottom, the positioning structures 305 are arranged along a path of mounting the clump weight 302 to the weighing pan support 306, and as shown in FIG. 3, the semicircular positioning bosses arranged on the side wall 3069 of the weighing pan support 306. At this time, notches in the clump weight 302 are respectively aligned with the positioning structures 305 on the weighing pan support 306, and the clump weight 302 is guided in a mounting position through the shape matching between the positioning structures 305 and the notched portion 3021. The clump weight 302 continues to be moved down to the bottom surface 3068 of the weighing pan support 306. At this time, the bottom of the clump weight 302 is reliably placed into the recess 3067 by means of a guide function of the clump weight 302. Then, the clump weight is rotated, and when each positioning structure 305 is located above the non-notched portion 3022 of the clump weight 302 supported by the weighing pan support 306, while the limiting member 3042 of the elastic limiting structure 304 is engaged with the notched portion 3021 of the clump weight 302, the positioning structure 305 functions together with the bottom surface 3068 of the weighing pan support 306 to fix the clump weight 302 in the vertical direction, and the elastic limiting structure 304 functions to fix the clump weight 302 in the horizontal direction. According to the above embodiment, a process of disassembling the weighing pan assembly is as follows: a squeezing force of each fixing structure 307 is overcome, so that the weighing pan 301 and the weighing pan support 306 are disconnected from each other; subsequently, the elastic limiting structure 304 is disengaged from the notched portion 3021 by manual means or auxiliary tools, and the clump weight 302 is continuously rotated to squeeze the elastic limiting structure 304 until the notched portions 3021 are located below the positioning structures 305, and the clump weight 302 is lifted upwards, to separate the clump weight 302 from the weighing pan support 306.
[0050] In another embodiment, when the weighing pan 301 and the weighing pan support 306 are in an inseparable state, the clump weight 302 is inserted horizontally, instead of placed vertically, into the recess 3067. The clump weight 302, for example in the shape of a square, a circle or an ellipse, directly horizontally extends below the positioning structure 305, and the positioning structure 305 achieves a vertical fixing function with the bottom surface 3068 of the weighing pan support 306. At this time, the elastic limiting structure 304 is not engaged with the notched portion 3021. Then, the clump weight 302 is moved by means of rotation or translation, so that the notched portion 3021 engages with the elastic limiting structure 304, and the fixing of the clump weight 302 in the horizontal direction is completed.
[0051] According to the above embodiment, a process of disassembling the weighing pan assembly is as follows: In the space defined by the weighing pan 301 and the weighing pan support 306, the clump weight 302 is moved by means such as translation and shifting, until the clump weight body squeezes the non-notched portion 3022, and the elastic limiting structure 304 and the notched portion 3021 are disengaged. At this time, the movement of the clump weight 302 is no longer prevented by the elastic limiting structure 304, and then the clump weight 302 is taken out by means of translation.
[0052] Still referring to FIG. 3, in some embodiments, the weighing pan support 306 further includes a fixing structure 307, and the fixing structure 307 is configured to apply a pre-tightening force to the weighing pan 301 to keep the weighing pan 301 and the weighing pan support 306 stable.
[0053] In some embodiments, the weighing pan 301 includes a horizontal disc surface 3012, a circumferential side surface 3013, and an inclined side surface 3014, and the circumferential side surface 3013 is connected to the horizontal disc surface 3012 by means of the inclined side surface 3014. The fixing structure 307 applies an inclined and downward pre-tightening force to the inclined side surface 3014, so that the weighing pan support and the weighing pan can be effectively connected to each other, thereby completing the fixing of the entire weighing pan system 30. In other embodiments, the fixing structure 307 may also directly apply a radial pre-tightening force to the circumferential side surface 3013 of the weighing pan 301 to clamp the weighing pan 301 on the weighing pan support 306.
[0054] In some embodiments, the fixing structure 307 includes an elastic portion 3071 and a limiting portion 3072, and the limiting portion 3072 includes a cambered surface for matching a surface of the weighing pan 301. For example, the elastic portion 3071 is a cantilever beam and the limiting portion 3072 is a limiting bead, so as to avoid damaging the surface of the weighing pan 301. After the weighing pan 301 is placed on the weighing pan support 306, the elastic portion 3071 is squeezed outwards or obliquely upwards due to interference fit, thereby providing a squeezing force to the weighing pan 301, so that the weighing pan support 306 clamps the weighing pan 301.
[0055] Preferably, the weighing pan support 306 includes a plurality of symmetrically distributed fixing structures 307, so as to realize symmetrical and multi-site fixing of the weighing pan 301.
[0056] In order to meet some requirements during weighing, based on the above embodiment, the weighing pan 301 may be allowed to overcome the squeezing force of the elastic portion 3071 to realize its own rotation. In some other embodiments, if the weighing pan 301 is required to remain stationary during weighing, the weighing pan 301 may further include a groove 3011 for engaging with the limiting portion 3072 to limit the movement of the weighing pan 301 and meet requirements of different application scenarios.
[0057] It can be understood that the weighing pan assembly includes a batch of clump weights 302 with different shapes and / or thicknesses and / or materials, and any one of the clump weights 302 matches the weighing pan support in a replaceable manner to realize the adjustment of balance weight parameters. By adjusting the shape, thickness or material of the clump weight 302, the weight of the clump weight 302 is adjusted, thereby adjusting the weight of the entire weighing pan system 30, which can meet weighing requirements of different balance sensors.
[0058] For example, when the balance weight needs to be lightened, a clump weight with a plurality of through holes in the surface or a clump weight with a relatively small thickness may be selected to meet use requirements. Therefore, by adjusting the clump weight, the same weighing pan and weighing pan support are used to adjust the weight of the entire weighing pan system to meet weighing requirements of different balance sensors, thereby reducing waste and costs of parts.
[0059] The shape of the clump weight 302 may also be designed to match the shape of the bottom surface of the weighing pan support 306. If the bottom surface of the weighing pan support 306 includes a protruding table 3066, an opening or recess for accommodating the protruding table 3066 may be reserved in the clump weight 302.
[0060] With reference to the above description of the weighing pan assembly, an electronic balance may be further provided. The electronic balance includes an air shield system, a balance shell and the above weighing pan assembly, which omits an adhesive process in an original weighing pan, realizes the replaceable design of the clump weight, solves the problems of high process costs and insufficient reliability in an existing product, and effectively improves production efficiency.
[0061] Specific words are used in the present application to describe the embodiments of the present application. For example, "one embodiment" , "an embodiment" , and / or "some embodiments" mean a certain feature, structure, or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "an embodiment" or "one embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this description does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the present application can be appropriately combined.
[0062] Although the present invention is disclosed as above in preferred embodiments, these preferred embodiments are not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any amendments, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention, without departing from the content of the technical solutions of the present invention, shall fall within the scope of protection defined by the claims of the present invention.
Claims
1.A weighing pan assembly (30) , which comprises a weighing pan (301) and a weighing pan support (306) that are stacked, characterized in that the weighing pan assembly further comprises:a clump weight (302) arranged between the weighing pan (301) and the weighing pan support (306) and comprising a notched portion (3021) and a non-notched portion (3022) that are located on the clump weight; andthe weighing pan support (306) comprises an elastic limiting structure (304) ,wherein the notched portion (3021) is configured to accommodate the elastic limiting structure (304) to limit the clump weight (302) , and the non-notched portion (3022) is configured to squeeze the elastic limiting structure (304) to allow the clump weight (302) to be movable.2.The weighing pan assembly of claim 1, characterized in that the elastic limiting structure (304) comprises an elastic member (3041) and a limiting member (3042) connected to the elastic member (3041) .3.The weighing pan assembly of claim 2, characterized in that a bottom surface of the non-notched portion (3022) is configured to be capable of squeezing the limiting member (3042) to apply a pressure to the elastic member (3041) in an axial direction of the clump weight (302) .4.The weighing pan assembly of claim 2, characterized in that an outer side surface of the non-notched portion (3022) is configured to be capable of squeezing the limiting member (3042) to apply a pressure to the elastic member (3041) in a radial direction of the clump weight (302) .5.The weighing pan assembly of any one of claims 2-4, characterized in that the elastic member (3041) is an elastic cantilever beam.6.The weighing pan assembly of any one of claims 2-5, characterized in that the notched portion (3021) comprises an inlet channel (3029) and an internal chamber (3028) , and a maximum width of a cross section of the inlet channel (3029) is less than a minimum width of the limiting member (3042) , so that the limiting member (3042) is capable of engaging with the internal chamber (3028) via the inlet channel (3029) .7.The weighing pan assembly of any one of claims 1-6, characterized in that the notched portion (3021) comprises an arc-shaped surface that comes into contact with the limiting member (3042) .8.The weighing pan assembly of any one of claims 1-7, characterized in that the weighing pan support (306) further comprises a positioning structure (305) that is located above the clump weight (302) supported on the weighing pan support (306) and is configured to fix the clump weight (302) together with a bottom surface of the weighing pan support (306) .9.The weighing pan assembly of claim 8, characterized in that the positioning structure (305) has a shape complementary to that of the notched portion (3021) , or a cross-sectional area of the positioning structure (305) is less than a notch cross-sectional area of the notched portion (3021) .10.The weighing pan assembly of claim 9, characterized in that the positioning structure (305) is arranged on a path of mounting the clump weight (302) to the weighing pan support (306) , and designed to guide the mounting of the clump weight (302) by cooperation between the positioning structure (305) and the notched portion (3021) during the mounting.11.The weighing pan assembly of any one of claims 1-10, characterized in that the weighing pan support (306) further comprises a fixing structure (307) , and the fixing structure (307) is configured to apply a pre-tightening force to the weighing pan (301) to keep the weighing pan (301) and the weighing pan support (306) in a relatively stable state.12.The weighing pan assembly of claim 11, characterized in that the fixing structure (307) applies a radial pre-tightening force to a circumferential side surface (3013) of the weighing pan (301) .13.The weighing pan assembly of claim 11, characterized in that the weighing pan (301) comprises a horizontal disc surface (3012) , the circumferential side surface (3013) , and an inclined side surface (3014) , the circumferential side surface (3013) is connected to the horizontal disc surface (3012) by the inclined side surface (3014) , and the fixing structure (307) applies a pre-tightening force to the inclined side surface (3014) .14.The weighing pan assembly of claim 11, characterized in that the fixing structure (307) comprises an elastic portion (3071) and a limiting portion (3072) , and the limiting portion (3072) comprises a cambered surface for matching a surface of the weighing pan (301) .15.The weighing pan assembly of claim 14, characterized in that the elastic portion (3071) is a cantilever beam, and the limiting portion (3072) is a limiting bead.16.The weighing pan assembly of claim 14, characterized in that the weighing pan (301) further comprises a groove (3011) with which the limiting portion (3072) engages to limit the movement of the weighing pan (301) .17.The weighing pan assembly of any one of claims 1-16, characterized in that the weighing pan assembly comprises a batch of clump weights with different shapes and / or thicknesses and / or materials, and any one of the clump weights is arranged between the weighing pan (301) and the weighing pan support (306) in a replaceable manner.18.An electronic balance, which comprises an air shield system (10) and a balance shell (20) , characterized in that the electronic balance further comprises a weighing pan assembly (30) according to any one of claims 1 to 17.