Anti-overload protection mechanism and weighing module and electronic scale comprising same

Abstract

The application provides an overload protection mechanism, a weighing module and an electronic scale comprising the same. The overload protection mechanism comprises an upper buffer part, a lower buffer part, an elastic buffer part and a bearing head. The lower end of the bearing head is fixed to a sensor of the weighing module. The upper end of the bearing head is provided with a mounting groove. The lower end of the elastic buffer part is fixed in the mounting groove. The lower end of the upper buffer part is provided with a mounting through hole. The upper end of the elastic buffer part is fixed in the mounting through hole, and the lower end of the upper buffer part is located in the mounting through hole. The lower buffer part is sleeved outside the upper buffer part. The outer circumferential surface of the lower end of the upper buffer part is provided with an outer spherical surface structure. The bottom of the lower buffer part is provided with an inner concave inner spherical surface structure. The outer spherical surface structure and the inner spherical surface structure are matched with each other to limit the upper buffer part in the height direction. The application can realize omnidirectional overload protection, is simple to install, saves product cost waste caused by irreversible damage of the module due to overload, and improves product performance.

Description

Technical Field

[0001] This invention relates to the field of weighing modules, and particularly to an overload protection mechanism and a weighing module and electronic scale including the same. Background Technology

[0002] Because small-capacity, high-precision weighing modules have limited weighing capacity and relatively thin structures, common abnormal loads can affect weighing performance or even damage the structure. Examples include human touch, improper wiping, or water gun cleaning. To ensure the weighing performance and reliability of the weighing module, an overload protection mechanism is an essential additional device.

[0003] Existing overload protection technologies for small-capacity, high-precision weighing modules typically employ moving parts to create sufficient / unaffected protective gaps and detach from vulnerable components. This facilitates the setting of limit protection and isolation of abnormal loads from being transmitted to vulnerable structures, thereby achieving the goal of protecting the vulnerable weighing structure.

[0004] The disengagement and reset of moving parts is the core mechanism of the overload protection mechanism, which ensures the generation of limit gaps and cuts off the transmission of abnormal forces to the vulnerable weighing structure.

[0005] The design of existing disengagement and reset structures for moving parts is relatively simple for abnormal loads in the vertical direction, with direct gap disengagement / reset. However, for abnormal loads in the horizontal and torsional directions, disengagement / reset will both apply torsional force to the fragile weighing structure and change the height of the moving part, which will not only easily lead to damage to the fragile weighing structure, but also make the limit design more complicated.

[0006] In view of this, those skilled in the art have designed an overload protection mechanism and a weighing module and electronic scale including the mechanism, which enhances the protection performance and provides convenient and accurate limit design. Summary of the Invention

[0007] The technical problem to be solved by the present invention is that the disengagement and reset structure of the moving parts in the existing overload protection mechanism can easily lead to damage to the fragile weighing structure and also cause the limit design to be complicated. The present invention provides an overload protection mechanism and a weighing module and electronic scale including the present invention.

[0008] The present invention solves the above-mentioned technical problems through the following technical solution:

[0009] An overload protection mechanism is characterized in that it includes an upper buffer part, a lower buffer part, an elastic buffer member, and a bearing head. The lower end of the bearing head is fixed to the sensor of the weighing module. The upper end of the bearing head is provided with a mounting groove. The lower end of the elastic buffer member is fixed in the mounting groove. The lower end of the upper buffer part is provided with a mounting through hole. The upper end of the elastic buffer member is fixed in the mounting through hole, and the lower end of the upper buffer part is located in the mounting through hole.

[0010] The lower buffer part is sleeved outside the upper buffer part. The outer peripheral surface of the lower end of the upper buffer part is set as an outer spherical structure, and the bottom of the lower buffer part is provided with an inner concave spherical structure. The outer spherical structure and the inner spherical structure cooperate with each other to limit the upper buffer part in the height direction.

[0011] According to one embodiment of the present invention, a first locking structure is provided in the mounting groove, and a first mating locking structure is provided at the lower end of the elastic buffer member, wherein the lower end of the elastic buffer member is fixedly connected to the first locking structure through the first mating locking structure.

[0012] According to one embodiment of the present invention, a second locking structure is provided in the mounting through hole, and a second mating locking structure is provided at the upper end of the elastic buffer member, and the upper end of the elastic buffer member is fixedly connected to the second locking structure through the second mating locking structure.

[0013] According to one embodiment of the present invention, the upper buffer member is a rod-shaped structure, and the mounting through hole is a threaded through hole for locking the elastic buffer member.

[0014] According to one embodiment of the present invention, the outer spherical structure is provided with a plurality of evenly distributed recesses, and the inner spherical structure is provided with a plurality of channels on its wall surface. Each channel is equipped with an adjustable positioning component, and the positioning component cooperates with the corresponding recess.

[0015] According to one embodiment of the present invention, each of the positioning components includes a positioning block, a spring, and a spring force adjustment member. The positioning block is embedded in the channel, the spring is sleeved on the spring force adjustment member, and the spring force adjustment member is connected to the channel. The spring pushes the positioning block by adjusting the spring force adjustment member.

[0016] According to one embodiment of the present invention, the lower buffer portion is threadedly connected to the bearing head.

[0017] The present invention also provides a weighing module, characterized in that the weighing module includes an overload protection mechanism, an inner limit positioning block, a weighing pan with an outer limit positioning structure, and a weighing module cover as described above. The weighing module cover is sleeved outside the overload protection mechanism and the sensor. The inner limit positioning block is sleeved on the upper end of the weighing module cover. The weighing pan passes through the weighing module cover and is connected to the upper end of the upper buffer part.

[0018] According to one embodiment of the present invention, the inner limiting positioning block includes a hollow cylindrical positioning part and a limiting part, the limiting part protruding outward around the bottom periphery of the positioning part, and the positioning part being fixedly connected to the weighing module cover.

[0019] According to one embodiment of the present invention, the outer limiting positioning structure of the weighing pan extends downward along the bottom end surface of the weighing pan and protrudes outward, and the outer limiting positioning structure is located outside the positioning part, and a first limiting gap is formed between the bottom of the outer limiting positioning structure and the limiting part.

[0020] According to one embodiment of the present invention, the external limiting positioning structure is annular and arranged circumferentially along the bottom end face of the weighing pan.

[0021] According to one embodiment of the present invention, the external limiting positioning structure consists of multiple protruding structures arranged circumferentially or at the apex of the bottom end surface of the weighing pan.

[0022] According to one embodiment of the present invention, the outer limiting positioning structure and the limiting part are perpendicular to each other.

[0023] According to one embodiment of the present invention, there is a first installation gap between the outer limiting positioning structure and the outer wall surface of the inner limiting positioning block, and there is a second installation gap between the upper buffer portion and the lower buffer portion.

[0024] According to one embodiment of the present invention, the second mounting gap is greater than the first mounting gap.

[0025] The present invention also provides an electronic scale, characterized in that the electronic scale includes the weighing module described above. The positive and progressive effects of the present invention are as follows:

[0026] This invention relates to an overload protection mechanism and a weighing module and electronic scale including the same. It modifies the generation method of the reset force, thereby reducing the detachment / reset force acting on the fragile weighing structure and enhancing the comprehensiveness and reliability of the protection. The overload protection mechanism provides all-around overload protection, is easy to install, saves on product cost waste caused by irreversible damage to the module due to overload, and improves product performance. It also has the following numerous advantages:

[0027] First, in terms of structure, the overload protection mechanism has a unique appearance, which is simple and elegant. It has a self-resetting function relying on the buffer block and tends to use common parts on the market.

[0028] Second, in terms of function, the overload protection mechanism can achieve all-round overload protection through the cooperation of the limiting positioning block, the buffer block, and the cover. At the same time, its complete separation from the sensor's elastic body provides ultimate protection for the sensor.

[0029] Third, in terms of processing, the overload protection mechanism has simple parts, and the design adopted will not suffer from poor reliability due to errors in processing accuracy. The limit buffer block is economical, compact, and easy to process. Attached Figure Description

[0030] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always denote the same features, wherein:

[0031] Figure 1 This is a perspective view of the overload protection mechanism of the present invention.

[0032] Figure 2 This is a front view of the overload protection mechanism of the present invention.

[0033] Figure 3 This is an exploded view of the overload protection mechanism of the present invention.

[0034] Figure 4 This is an assembly diagram of the upper buffer section, lower buffer section, and bearing head in the overload protection mechanism of the present invention.

[0035] Figure 5 This is a top view of the upper buffer section, lower buffer section, and bearing head of the overload protection mechanism of the present invention after assembly.

[0036] Figure 6 This is a schematic diagram of the weighing module of the present invention.

[0037] Figure 7 This is a perspective view of the inner limit positioning block in the weighing module of the present invention.

[0038] Figure 8 This is a schematic diagram of the weighing module of the present invention when the weighing pan is facing upwards.

[0039] Figure 9 This is a schematic diagram of the weighing module of the present invention when the weighing pan is facing downwards.

[0040] Figure 10 This is a schematic diagram showing the state of the weighing pan rotating in the weighing module of the present invention.

[0041] Figure 11 This is a top view of the square weighing pan in the weighing module of the present invention when it rotates.

[0042] Figure 12 This is a top view of the circular weighing pan in the weighing module of the present invention when it rotates.

[0043] [Attached image labels]

[0044] Upper buffer section 10

[0045] Lower buffer section 20

[0046] Elastic buffer 30

[0047] 40 bearing head

[0048] Sensor 50

[0049] Mounting groove 41

[0050] Mounting through hole 11

[0051] 12 outer spherical structure

[0052] Inner spherical structure 21

[0053] Channel 211

[0054] 121 pits

[0055] Positioning block 212

[0056] Spring 213

[0057] Elastic Adjustment Component 214

[0058] Inner limit positioning block 60

[0059] 70 weighing pan

[0060] Weighing module housing 80

[0061] Positioning Unit 61

[0062] Limiting part 62

[0063] External limiting positioning structure 71

[0064] First limiting gap t1

[0065] Second limiting gap t2

[0066] First installation gap d1

[0067] Second installation gap d2 Detailed Implementation

[0068] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0069] Embodiments of the invention will now be described in detail with reference to the accompanying drawings. Preferred embodiments of the invention will now be described in detail, examples of which are shown in the drawings. Wherever possible, the same reference numerals will be used in all the drawings to denote the same or similar parts.

[0070] Furthermore, although the terminology used in this invention is selected from commonly known and used terms, some terms mentioned in this specification may have been selected by the applicant in his or her judgment, and their detailed meanings are explained in the relevant sections of the description herein.

[0071] Furthermore, the invention should be understood not only through the actual terminology used, but also through the meaning implied by each term.

[0072] like Figures 1 to 12 As shown, this invention discloses an overload protection mechanism, which includes an upper buffer part 10, a lower buffer part 20, an elastic buffer member 30, and a bearing head 40. The lower end of the bearing head 40 is fixed to the sensor 50 of the weighing module. The upper end of the bearing head 40 has a mounting groove 41, in which the lower end of the elastic buffer member 30 is fixed. The lower end of the upper buffer part 10 has a mounting through hole 11, in which the upper end of the elastic buffer member 30 is fixed, and the lower end of the upper buffer part 10 is located within the mounting through hole 11.

[0073] The lower buffer portion 20 is sleeved on the outside of the upper buffer portion 10. The outer peripheral surface of the lower end of the upper buffer portion 10 is configured as an outer spherical structure 12, and the bottom of the lower buffer portion 20 is provided with a concave inner spherical structure 21. The outer spherical structure 12 and the inner spherical structure 21 cooperate with each other to limit the upper buffer portion 10 in the height direction, thereby allowing the upper buffer portion 10 to rotate, slide, and reset within the lower buffer portion 20. Of course, this is only an example, and other matching rotation limiting structures are also within the scope of protection of this application, as long as they can achieve the same function.

[0074] For example, in this embodiment, the bottom of the upper buffer portion 10 is provided with a mounting through hole 11, and one end of the elastic buffer member 30 is fixed in the mounting through hole 11, while the other end is fixed in the mounting groove 41. The elastic buffer member 30 can provide the forming space between the upper buffer portion 10 with a reset structure and the lower buffer portion 20 with a reset structure, as well as the reset structure and the reset force required for normal weighing.

[0075] Here, a first locking structure is preferably provided in the mounting groove 41, and a first mating locking structure (not shown in the figure) is provided at the lower end of the elastic buffer 30. The lower end of the elastic buffer 30 is fixedly connected to the first locking structure through the first mating locking structure.

[0076] Similarly, a second locking structure is preferably provided in the mounting through hole 11, and a second mating locking structure (not shown in the figure) is provided at the upper end of the elastic buffer 30. The upper end of the elastic buffer 30 is fixedly connected to the second mating locking structure and the second locking structure.

[0077] Of course, mounting and positioning structures can also be provided on the upper buffer part 10 and the lower buffer part 20 for mounting and positioning elastic buffer 30, or a rotation positioning structure can be provided to increase the rotational reset capability.

[0078] Furthermore, the lower buffer section 20 and the bearing head 40 are preferably connected by a thread.

[0079] Preferably, the upper buffer 10 is configured as a rod-shaped structure, and the mounting through hole 11 is preferably a threaded through hole for locking the elastic buffer 30. Here, the elastic buffer 30 is preferably a spring, but other elastic components can also be used.

[0080] Furthermore, the outer spherical structure 12 is provided with a plurality of evenly distributed recesses 121, and the inner spherical structure 21 is provided with a plurality of channels 211 on its wall surface. An adjustable positioning component is installed in each channel 211, and the positioning component cooperates with the corresponding recess 121. Preferably, each positioning component includes a positioning block 212, a spring 213, and a spring force adjustment member 214. The positioning block 212 is embedded in the channel 211, the spring 213 is sleeved on the spring force adjustment member 214, and the spring force adjustment member 214 is connected to the channel 211. By adjusting the spring force adjustment member 214, the spring 213 pushes the positioning block 212.

[0081] The present invention also provides a weighing module, which includes an overload protection mechanism as described above, an inner limit positioning block 60, a weighing pan 70 with an outer limit positioning structure, and a weighing module cover 80. The weighing module cover 80 is sleeved outside the overload protection mechanism and the sensor 50. The inner limit positioning block 60 is sleeved on the upper end of the weighing module cover 80. The weighing pan 70 passes through the weighing module cover 80 and is connected to the upper end of the upper buffer part 10.

[0082] Furthermore, the inner limiting positioning block 60 includes a hollow cylindrical positioning part 61 and a limiting part 62. The limiting part 62 protrudes outward around the bottom periphery of the positioning part 61, and the positioning part 61 is fixedly connected to the weighing module cover 80. The outer limiting positioning structure 71 of the weighing pan 70 extends downward along the bottom end surface of the weighing pan 70 and is located outside the positioning part 61. A first limiting gap t1 is formed between the bottom of the outer limiting positioning structure 71 and the limiting part 62.

[0083] For example, the outer limiting positioning structure 71 is annular and arranged circumferentially along the bottom end face of the weighing pan 10. Alternatively, the outer limiting positioning structure 71 may consist of multiple protruding structures arranged circumferentially or at the apex of the bottom end face of the weighing pan 10. Of course, the outer limiting positioning structure 71 here is only an example, and other structures can also be used as long as they achieve the same function, and all are within the protection scope of this application.

[0084] When the weighing pan 10 is loaded, the weighing pan 10 presses down on the upper buffer part 10 and moves it along the mounting groove 41. There is a first limiting gap t1 between the outer limiting positioning structure 71 and the inner limiting positioning block 60 of the weighing pan 10, and there is a second limiting gap t2 between the bottom of the upper buffer part 10 and the bottom of the mounting groove 41.

[0085] Preferably, the second limiting gap t2 is greater than the first limiting gap t1, so that the outer limiting positioning structure 71 and the inner limiting positioning block 60 form a good front-back, left-right, and lateral limiting effect, so that the upper buffer 10 does not contact the bottom of the mounting groove 41, and the force does not act directly on the sensor, thus preventing the force from being transmitted to the sensor.

[0086] Furthermore, the outer limiting positioning structure 71 and the limiting part 62 can be configured to be perpendicular to each other.

[0087] In addition, there is a first installation gap d1 between the outer wall surfaces of the outer limiting positioning structure 71 and the inner limiting positioning block 60, and a second installation gap d2 between the upper buffer part 10 and the lower buffer part 20. Preferably, the second installation gap d2 is greater than the first installation gap d1.

[0088] The present invention also provides an electronic scale, which includes the weighing module described above.

[0089] According to the above structural description, in the overload protection mechanism and the weighing module and electronic scale including it of the present invention, for the weighing pan 70 with an external limiting positioning structure, the external limiting positioning structure, which is arranged in a circumferential or rectangular direction or at the vertices, can be added based on the shape of the weighing pan 70 (e.g., a round weighing pan or a rectangular weighing pan). Figures 10 to 12The rotational limiting structure shown forms a gap with the inner limiting positioning block 60 to limit the rotation. This rotational limiting structure has a certain height, thus forming a vertical gap (i.e., the first limiting gap t1) between itself and the inner limiting positioning block 60, thereby ensuring that the entire mechanism forms the gap required for pressure limiting.

[0090] Since the gap of the rotation limit needs to be adjusted, a notch for easy observation or adjustment of the inner limit positioning block can also be set in the middle position of the rectangle of the rotation limit structure.

[0091] For the inner limiting positioning block 60, depending on the shape of the weighing pan 70 (e.g., a round or rectangular weighing pan), the inner limiting positioning block 60 can be designed as a circular or rectangular structure, forming a first limiting gap t1 together with the outer limiting positioning structure 71 of the weighing pan 70. A channel hole for transmitting the weighing force of the weighing pan downwards is present in the center of the inner limiting positioning block 60. The inner limiting positioning block 60 and the weighing module cover 80 can be connected by bolts to form a fixed connection.

[0092] Specifically, the rotation direction position between the inner limit positioning block 60 and the weighing module cover 80 can be adjusted to form a better rotation limit gap.

[0093] The weighing module housing 80 can be configured as a vertical cylindrical structure. The inside of the cylindrical structure is the force transmission channel of the weighing pan. The external limiting and positioning structure 71 cooperates with the internal limiting and positioning block 60 to provide a basis for rotation adjustment or positioning.

[0094] For the upper buffer portion 10 with a reset structure, the limiting structure includes a vertical positioning cone structure and a reset pit or convex structure in the rotation direction. When rotated, the reset pit or convex structure can rotate out of the mating convex or pit structure, but when the rotational force disappears, the structure can return to the preset angle and vertical position under the action of elastic force.

[0095] Similarly, for the lower buffer portion 20 with a reset structure, the limiting structure includes a vertical positioning cone structure and a rotational reset protrusion or pit structure. This structure cooperates with the upper buffer portion with the reset structure and forms a certain buffer stroke. When rotating, the reset pit or protrusion structure can rotate out of the cooperating protrusion or pit structure, but when the rotational force disappears, the structure can return to the preset angle and vertical position under the action of elastic force.

[0096] The present invention relates to an overload protection mechanism and a weighing module and electronic scale including the overload protection mechanism. The weighing module has a weighing limit structure at the top, thereby overcoming the problem that the lower limit in the existing limit technology cannot completely limit the entry of abnormal loads, resulting in only protecting vulnerable parts, and thus protecting the entire weighing module.

[0097] A weighing buffer reset structure is implemented on the upper part of the weighing module, thereby reducing the generation of abnormal loads and minimizing the further impact of abnormal loads on internal components.

[0098] A buffer reset structure is implemented on the upper part of the weighing module to achieve vertical and rotational reset, clearly defining the position of the weighing pan and improving the protection effect.

[0099] A weighing buffer reset structure is implemented on the upper part of the weighing module, thereby providing more limit margin, reducing the implementation requirements of the protection limit and improving the protection effect.

[0100] By combining limit and buffer technologies on the upper part of the weighing module, a comprehensive, reliable, and easy-to-install overload protection mechanism is achieved, thereby improving the weighing performance and reliability of the small-capacity, high-precision weighing module.

[0101] The overload protection mechanism and the weighing module and electronic scale including it have the following features:

[0102] I. The structure is simple, and the entire limiting mechanism consists of only a few parts;

[0103] Second, it is easy to process, and the parts such as limit positioning blocks and buffer blocks have simple structures;

[0104] Third, it is easy to install, as the installation is integrated with existing module mounting holes and can be done using existing module mounting holes.

[0105] IV. High precision and reliability: The special design of the limiting pad and buffer block ensures that the symmetrical weight-bearing is unaffected in all directions.

[0106] 5. Unique contact: The limit protection is achieved by using the gap between the limiting positioning block and the buffer pad. The upper and lower buffer blocks use arc contact and have a self-resetting function in the rotation direction.

[0107] This invention addresses the problems encountered in the design of small-capacity, high-precision weighing modules, overcomes the difficulties in weighing module design, and designs a set of overload protection mechanisms with strong and comprehensive protection capabilities, thereby improving the weighing performance and reliability of small-capacity, high-precision weighing modules.

[0108] In summary, the overload protection mechanism and the weighing module and electronic scale including it of the present invention change the way the reset force is generated, thereby reducing the detachment / reset force acting on the fragile weighing structure and enhancing the comprehensiveness and reliability of the protection. The overload protection mechanism can achieve all-round overload protection, is easy to install, saves product cost waste caused by irreversible damage to the module due to overload, and improves product performance. It also has the following many advantages:

[0109] First, in terms of structure, the overload protection mechanism has a unique appearance, which is simple and elegant. It has a self-resetting function relying on the buffer block and tends to use common parts on the market.

[0110] Second, in terms of function, the overload protection mechanism can achieve all-round overload protection through the cooperation of the limiting positioning block, the buffer block, and the cover. At the same time, its complete separation from the sensor's elastic body provides ultimate protection for the sensor.

[0111] Third, in terms of processing, the overload protection mechanism has simple parts, and the design adopted will not suffer from poor reliability due to errors in processing accuracy. The limit buffer block is economical, compact, and easy to process.

[0112] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. An overload protection mechanism, characterized in that, The anti-overload protection mechanism comprises an upper buffer part, a lower buffer part, an elastic buffer piece and a bearing head, the lower end of the bearing head is fixed to the sensor of the weighing module, the upper end of the bearing head is provided with a mounting groove, the lower end of the elastic buffer piece is fixed in the mounting groove, the lower end of the upper buffer part is provided with a mounting through hole, the upper end of the elastic buffer piece is fixed in the mounting through hole, and the lower end of the upper buffer part is located in the mounting groove; The lower buffer part is sleeved outside the upper buffer part, the lower end of the upper buffer part is provided with an outer spherical surface structure, the bottom of the lower buffer part is provided with an inner spherical surface structure, the outer spherical surface structure and the inner spherical surface structure are matched with each other to limit the upper buffer part in the height direction, so that the upper buffer part can rotate and slide in the lower buffer part and reset. A plurality of uniformly distributed pits are arranged on the outer spherical surface structure, a plurality of channels are arranged on the wall surface of the inner spherical surface structure, and one adjustable position positioning assembly is arranged in each channel.

2. The anti-overload protection mechanism of claim 1, wherein The mounting groove is provided with a first locking structure, the lower end of the elastic buffer piece is provided with a first matching locking structure, and the lower end of the elastic buffer piece is fixedly connected through the first matching locking structure and the first locking structure.

3. The anti-overload protection mechanism of claim 1, wherein The mounting through hole is provided with a second locking structure, the upper end of the elastic buffer piece is provided with a second matching locking structure, and the upper end of the elastic buffer piece is fixedly connected through the second matching locking structure and the second locking structure.

4. The anti-overload protection mechanism of claim 3, wherein The upper buffer part is a rod-shaped structure, and the mounting through hole is a threaded through hole for locking the elastic buffer piece.

5. The anti-overload protection mechanism of claim 1, wherein Each positioning assembly comprises a positioning block, a spring and an elastic force adjusting piece, the positioning block is embedded in the channel, the spring is sleeved on the elastic force adjusting piece, the elastic force adjusting piece is connected with the channel, and the spring pushes the positioning block by adjusting the elastic force adjusting piece.

6. The anti-overload protection mechanism of claim 1, wherein The lower buffer part is threadedly connected with the bearing head.

7. Weighing module, characterized in that The weighing module comprises the anti-overload protection mechanism, the inner limiting positioning block, the scale disc with the outer limiting positioning structure and the weighing module shell according to any one of claims 1-6, the weighing module shell is sleeved outside the anti-overload protection mechanism and the sensor, the inner limiting positioning block is sleeved on the upper end of the weighing module shell, and the scale disc is connected with the upper end of the upper buffer part by penetrating into the weighing module shell.

8. Weighing module according to claim 7, characterized in that The inner limiting positioning block comprises a hollow cylindrical positioning part and a limiting part, the limiting part protrudes outward along the bottom of the positioning part, and the positioning part is fixedly connected with the weighing module shell.

9. Weighing module according to claim 8, characterized in that The outer limiting positioning structure of the scale disc protrudes downward along the bottom end surface of the scale disc, and the outer limiting positioning structure is located outside the positioning part, and a first limiting gap is formed between the bottom of the outer limiting positioning structure and the limiting part.

10. Weighing module according to claim 9, characterized in that The outer limiting positioning structure is annular and arranged circumferentially along the bottom end surface of the scale disc.

11. The load cell module of claim 9, wherein, The outer limiting positioning structure is a plurality of protruding structures and arranged circumferentially or at the vertex position of the bottom end surface of the scale disc.

12. The load cell module of claim 9, wherein, The outer limiting positioning structure and the limiting part are perpendicular to each other.

13. The load cell module of claim 9, wherein, The outer limiting positioning structure and the outer wall surface of the inner limiting positioning block have a first installation gap, and the upper buffer part and the lower buffer part have a second installation gap.

14. The load cell module of claim 13, wherein, The second installation gap is larger than the first installation gap.

15. An electronic scale, characterized in that The electronic scale comprises the weighing module according to any one of claims 7-14.

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