Strain type weighing module

Abstract

The utility model provides a strain type weighing module. The strain type weighing module is characterized in that a strain type sensor is fixed on a bottom plate; the upper cushion block is fixed at the bearing end of the strain type sensor, and the first end part of the upper cushion block extends outwards to the outer side of the strain type sensor; the limiting connecting piece is provided with a first limiting groove, the first end of the upper cushion block is partially contained in the first limiting groove, and the lower portion of the limiting connecting piece is connected with the bottom plate. An upper limiting gap is formed between the first limiting groove and the upper end face of the first end of the upper cushion block, and a lower limiting gap is formed between the first limiting groove and the lower end face of the first end of the upper cushion block. The height of the first limiting groove of the limiting connecting piece relative to the bottom plate is adjustable, so that the upper limiting gap and the lower limiting gap are adjustable. According to the utility model, a limiting structure with adjustable upper and lower limits is adopted, the application occasions of forward installation and reverse installation of the weighing module are met, and meanwhile, a unified limiting device is used by a multi-capacity sensor, so that the variety and the number of materials are reduced, and more convenient assembly is realized.

Description

Technical Field

[0001] This utility model relates to the field of strain gauge weighing modules, and in particular to a strain gauge weighing module. Background Technology

[0002] With the development of industrial process weighing, more and more automated equipment in the field of strain gauge weighing modules are integrating single-point weighing modules for rapid product weight detection, such as lithium battery filling processes, food sorting processes, etc.

[0003] Figure 1 This is a schematic diagram of a strain gauge weighing module. Figure 1 As shown, the strain gauge weighing module includes a weighing pan 10, a housing 20, and a base plate 30. The housing 20 is mounted on the base plate 30, and the weighing pan 10 is fixed to the housing 20. To improve production efficiency, multi-channel arrangement of weighing modules is often used, thus requiring the weighing module to be sufficiently narrow.

[0004] However, the equipment integrator and the end customer are usually not the same company, and the equipment space is small and obstructed, so the weighing module needs to be transported to the customer's site before it can be installed. This approach is very inconvenient.

[0005] Figure 2 This is a schematic diagram showing the weighing module integrated into the equipment. (Example) Figure 2 As shown, current equipment integrators first integrate the weighing module directly onto the equipment base 40, and the weighing fixtures 50 related to weighing are also pre-installed on the weighing module. Then, they are shipped to the end customer along with the equipment.

[0006] Therefore, according to the above processing method, the weighing module is actually transported with a certain load, and the bumps and vibrations during transportation can easily damage the sensor. At this time, the transportation protection function of the weighing module is very important.

[0007] For example, during on-site commissioning and use by customers, abnormal loading of the robotic arm, abnormal loads caused by workers stepping on it, or tools falling may all lead to overload damage to the load cells. Therefore, the weighing module needs to be designed with overload protection functions.

[0008] To address the above situation, current weighing modules on the market typically use stepped limit switches with a fixed limit gap. Different capacity sensors require steps of varying heights to control the fixed limit gap. Each capacity sensor requires a corresponding base plate and housing, increasing the variety and quantity of materials that can be handled. Furthermore, in existing limit switch methods, the excessively long assembly dimension chain demands high precision in parts machining and assembly, increasing costs and resulting in poor reliability.

[0009] Furthermore, with market development, more and more automation manufacturers are adopting weighing grippers to pick up batteries and weigh them during the gripping process to improve production efficiency. This application often requires the modules to be used in reverse configuration, which means that these weighing modules also need to consider an adjustable upper limit.

[0010] In view of this, this application designs a strain gauge weighing module in order to overcome the above-mentioned technical problems. Utility Model Content

[0011] The technical problem to be solved by this utility model is to overcome the defects of existing weighing modules that are easily damaged during transportation when carried under load, and whose upper and lower limits are fixed and cannot be adjusted, and to provide a strain gauge weighing module.

[0012] The present invention solves the above-mentioned technical problems through the following technical solution:

[0013] A strain gauge weighing module, characterized in that the strain gauge weighing module comprises:

[0014] A base plate and a strain gauge sensor, wherein the strain gauge sensor is fixed on the base plate;

[0015] An upper pad is fixed to the bearing end of the strain gauge sensor, and the first end of the upper pad extends outward to the outside of the strain gauge sensor.

[0016] A limiting connector has a first limiting groove, the first end of the upper pad is partially accommodated in the first limiting groove, and the lower part of the limiting connector is connected to the base plate.

[0017] An upper limit gap is formed between the first limiting groove and the upper end face of the first end of the upper pad block, and a lower limit gap is formed between the first limiting groove and the lower end face of the first end of the upper pad block.

[0018] The height of the first limiting groove of the limiting connector relative to the base plate is adjustable, so that the upper limiting gap and the lower limiting gap are adjustable.

[0019] According to one embodiment of the present invention, the strain gauge weighing module further includes a limiting pad, the limiting pad being fixed on the base plate and located below the first end of the upper pad, and the lower part of the limiting connector being connected to the limiting pad.

[0020] According to one embodiment of the present invention, the limiting connector includes an upper limiting end and a lower limiting end, which are arranged vertically at intervals. The upper limiting end and the lower limiting end are adjusted by adjusting their positions.

[0021] According to one embodiment of the present invention, the limiting connector further includes a connecting rod, the upper limiting end and the lower limiting end are mounted on the connecting rod, and the portion of the connecting rod located below the lower limiting end is a threaded section, which is threadedly connected to the limiting pad.

[0022] According to one embodiment of the present utility model, a first limiting groove is formed between the upper limit end, the lower limit end and the connecting rod, and a second limiting groove is provided at the first end of the upper pad block. The first limiting groove and the second limiting groove are correspondingly engaged, so that the upper limit end is located above the second limiting groove, and an upper limit gap is formed between the two.

[0023] The lower limit end is located below the second limit groove, and the two form the lower limit gap.

[0024] According to one embodiment of the present invention, the length of the first limiting groove and the thickness of the second limiting groove satisfy the following relationship: Z(1+10%)+D <L-H<2(1+50%)X;

[0025] Where Z represents the average full-load deflection of the strain gauge sensor with the largest capacity that can be installed in the weighing module, L represents the length of the first limiting groove, H represents the thickness of the second limiting groove, X represents the average full-load deflection of the strain gauge sensor with the smallest capacity that can be installed in the weighing module, and D represents the compensation amount.

[0026] According to one embodiment of the present invention, the outer wall surface of the lower limiting end is polygonal.

[0027] According to one embodiment of the present invention, the upper pad is stepped, the second end of the upper pad is fixed to the bearing end of the strain sensor, and the first end of the upper pad protrudes downward along the bottom of the second end.

[0028] According to one embodiment of the present invention, a set screw is also provided on the side of the limiting pad for tightening the side of the limiting connector.

[0029] According to one embodiment of the present invention, the strain gauge weighing module further includes a housing, which covers the outside of the strain gauge sensor. The bottom of the housing is fixedly connected to the base plate, and at least one side of the bottom of the housing is provided with a sinking groove.

[0030] According to one embodiment of the present invention, the bottom of the base plate is provided with an opening groove.

[0031] According to one embodiment of the present invention, the base plate is further provided with a mounting boss, the mounting boss is provided with a limiting step, the strain sensor is fixed on the mounting boss, and the limiting pad is fixed on the limiting step.

[0032] The positive and progressive effects of this utility model are as follows:

[0033] This utility model of strain gauge weighing module adopts a limit structure with adjustable upper and lower limits, which can meet the application scenarios of both upright and reverse installation of the weighing module. At the same time, it also realizes the use of a unified limit device for multiple capacity sensors, thereby reducing the types and number of materials and achieving more convenient assembly. Attached Figure Description

[0034] The above and other features, properties and advantages of this utility model 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:

[0035] Figure 1 This is a schematic diagram of a strain gauge weighing module.

[0036] Figure 2 This is a schematic diagram of the weighing module integrated into the equipment.

[0037] Figure 3 This is a perspective view of the strain gauge weighing module of this utility model.

[0038] Figure 4 This is a longitudinal sectional view of the strain gauge weighing module of this utility model.

[0039] Figure 5 for Figure 4 Enlarged view of section A.

[0040] Figure 6 This is a schematic diagram of the limiting connector in the strain gauge weighing module of this utility model.

[0041] Figure 7 This is a schematic diagram of the upper pad block in the strain gauge weighing module of this utility model.

[0042] Figure 8 This is a schematic diagram of the shell structure in the strain gauge weighing module of this utility model.

[0043] Figure 9 This is a schematic diagram of the base plate in the strain gauge weighing module of this utility model.

[0044] [Attached image labels]

[0045] Weighing pan 10, 300

[0046] Casing 20, 700

[0047] Base plate 30, 100

[0048] Equipment base 40

[0049] Weighing fixture 50

[0050] 200 strain gauge sensor

[0051] Upper pad 400

[0052] Limit connector 500

[0053] Limiting pad 600

[0054] The bearing end 210 of the strain gauge sensor

[0055] Fixed end 220 of strain gauge sensor

[0056] First mounting bolt 800

[0057] Fastener 900

[0058] The first end 410 of the upper pad

[0059] Protrusion 411

[0060] Second mounting bolt 810

[0061] Connecting rod 510

[0062] Upper limit 520

[0063] Lower limit end 530

[0064] Hexagonal head 531

[0065] First limiting groove 511

[0066] Thread section 512

[0067] Second limiting groove 420

[0068] Upper limit gap a

[0069] Lower limit gap b

[0070] The length L of the first limiting groove

[0071] The thickness H of the second limiting groove

[0072] Set screw 610

[0073] The second end of the upper pad 430

[0074] 710 sinkhole

[0075] Steps 720

[0076] Mounting threaded hole 721

[0077] Opening groove 110

[0078] Install boss 120

[0079] Limiting step 130

[0080] 140 level Detailed Implementation

[0081] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0082] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Preferred embodiments of the present 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.

[0083] Furthermore, although the terminology used in this utility model is selected from commonly known and used terms, some terms mentioned in this utility model specification may have been selected by the applicant in his or her judgment, and their detailed meanings are explained in the relevant parts of the description herein.

[0084] Furthermore, it is required that this utility model be understood not only through the actual terminology used, but also through the meaning implied by each term.

[0085] like Figures 3 to 5 As shown, this utility model discloses a strain gauge weighing module, including: a base plate 100, a strain gauge sensor 200, a weighing pan 300, an upper pad 400, a limiting connector 500, a limiting pad 600, and a housing 700. The strain gauge sensor 200 is fixed to the base plate 100, and the housing 700 covers the outside of the strain gauge sensor 200, with its bottom fixedly connected to the base plate 100. The weighing pan 300 passes through the housing 700 and connects to the bearing end 210 of the strain gauge sensor 200. The fixed end 220 of the strain gauge sensor 200 is fixedly connected to the base plate 100 via a fastener 900 (e.g., a mounting bolt). That is, the fixed end 220 of the strain gauge sensor 200 is fixed to the base plate 100, and the bearing end 210 of the strain gauge sensor 200 is fixed to the weighing pan 300. In a preferred embodiment, the strain gauge sensor 200 is a beam-type sensor.

[0086] The upper pad 400 is fixed between the bearing end 210 of the strain gauge sensor 200 and the weighing pan 300. For example, the strain gauge sensor 200 and the upper pad 400 are fixed together by the first mounting bolt 800, and the weighing pan 300 and the upper pad 400 can also be fixed together by the first mounting bolt 800. At the same time, the first end 410 of the upper pad 400 extends outward to the outside of the strain gauge sensor 200.

[0087] The limiting connector 500 has a first limiting groove 511, and the first end 410 of the upper pad 400 is partially accommodated within the first limiting groove 511. The lower part of the limiting connector 500 is connected to the base plate 100. The limiting pad 600 is fixed to the base plate 100 and located below the first end 410 of the upper pad 400. The lower part of the limiting connector 500 is connected to the limiting pad 600. This connection can be a direct connection (e.g., the lower part of the limiting connector 500 is directly connected to the limiting pad 600) or an indirect connection (e.g., the lower part of the limiting connector 500 is connected to the limiting pad 600 through one or more parts).

[0088] In this embodiment, the limiting pad 600 can be integrally formed with the base plate 100 or be a separate structure. For example, the limiting pad 600 can be detachably connected to the base plate 100. Preferably, the limiting pad 600 is fixed to the base plate 100 using a second mounting bolt 810. The limiting connector 500 can preferably be a limiting screw structure, which is threadedly connected to the limiting pad 600.

[0089] like Figure 6 As shown, the limiting connector 500 preferably includes a connecting rod 510, an upper limiting end 520, and a lower limiting end 530. The upper limiting end 520 is fixed to the connecting rod 510 (e.g., fixed to the top of the connecting rod 510), and the lower limiting end 530 is fixed to the connecting rod 510. The upper limiting end 520 and the lower limiting end 530 are arranged vertically at intervals, that is, there is a gap between the lower limiting end 530 and the upper limiting end 520, so that a first limiting groove 511 is formed between the upper limiting end 520, the lower limiting end 530, and the connecting rod 510. For example, the connecting rod portion at the first limiting groove 511 can preferably be a smooth rod. Meanwhile, the connecting rod portion located below the lower limiting end 530 is preferably a threaded section 512. The limiting connector 500 is threadedly connected to the limiting pad 600 through the threaded section 512. In this embodiment, the connecting rod 510, the upper limiting end 520, and the lower limiting end 530 can preferably be an integrally formed structure.

[0090] In this embodiment, to facilitate the adjustment of the limiting gap, the lower limiting end 530 of the limiting connector 500 is preferably set as a polygon (e.g., a hexagonal structure), that is, the outer wall surface of the lower limiting end 530 is polygonal, such as... Figure 6The lower limit end 530 shown is a hexagonal head 531. Meanwhile, the threaded section 512 of the limiting connector 500 preferably uses a fine-pitch thread. Because the deformation of the strain gauge sensor 200 under rated load is very small, the limiting gap is also very small. Even a slight change in the limiting gap can lead to a significant change in the limiting weight value. Therefore, in this embodiment, the threaded section 512 uses a fine-pitch thread, utilizing its small pitch to more easily and accurately control the size of the limiting gap.

[0091] Furthermore, in this embodiment, the upper limit end 520 can also be configured as a nut structure, that is, by adjusting the upper limit end 520, the length of the first limiting groove 511 can be adjusted, thereby more flexibly adjusting the upper limit gap and the lower limit gap, and adapting to a wider range of strain gauge sensors 200.

[0092] like Figure 7 As shown, the first end 410 of the upper pad 400 has a second limiting groove 420. The first limiting groove 511 and the second limiting groove 420 are correspondingly engaged, such that the upper limiting end 520 is located above the second limiting groove 420, and an upper limiting gap a is formed between the upper limiting end 520 and the upper end face of the first end 410 of the upper pad 400 (i.e., an upper limiting gap a is formed between the first limiting groove 511 and the upper end face of the first end 410 of the upper pad 400). The lower limiting end 530 is located below the second limiting groove 420, and a lower limiting gap b is formed between the lower limiting end 530 and the lower end face of the first end 410 of the upper pad 400 (i.e., a lower limiting gap b is formed between the first limiting groove 511 and the lower end face of the first end 410 of the upper pad 400).

[0093] In this embodiment, the height of the first limiting groove 511 of the limiting connector 500 relative to the base plate 100 is adjustable, so that the upper limiting gap a and the lower limiting gap b are adjustable. Since the limiting connector 500 and the limiting pad 600 are threadedly connected, the height of the limiting connector 500 can be adjusted by turning the limiting connector 500, thereby realizing the adjustment of the upper limiting gap a and the lower limiting gap b.

[0094] In other words, there is a gap between the upper pad 400 and the limiting connector 500. The upper and lower limiting gaps ensure that the strain gauge sensor 200 can work normally within the rated load. During on-site commissioning and use, if the robotic arm is abnormally loaded, or if abnormal loads are caused by workers stepping on it or tools falling, and the weighing pan 300 is subjected to a downward overload force exceeding the rated load, the lower limiting end 530 of the limiting connector 500 contacts the upper pad 400, providing a reverse support force to the upper pad 400, preventing the strain gauge sensor 200 (i.e., the elastic body) from continuing to deform in the forward direction, thus achieving overload protection.

[0095] When the weighing module transports with the customer's weighing tooling, the customer's weighing tooling is fixed to the weighing pan with bolts. During transportation, due to the relatively large acceleration of the vehicle body jolting up and down, the customer's weighing tooling will convert into an up and down overload impact force under the acceleration, causing the strain gauge sensor 200 (i.e., the elastomer) to continuously deform forward and backward. During this process, after the upper limit end 520 and the lower limit end 530 of the limit connecting part 500 come into contact with the limit groove 420 of the upper pad 400, it can prevent the strain gauge sensor 200 (i.e., the elastomer) from being overloaded in both forward and reverse directions.

[0096] Based on the above structural description, in order to achieve a set of limit structures shared by multiple sensors in this application, the cooperation between the upper pad and the limit connecting part requires dimensional chain fitting calculations. For example, taking the case where the same set of limit structures is adapted to three sensors with capacities of 5 kg, 10 kg, and 20 kg at the same time, the average full-load deflection of the 5 kg sensor is X mm, the average full-load deflection of the 10 kg sensor is Y mm, and the average full-load deflection of the 20 kg sensor is Z mm, where X < Y < Z. If the difference between the length L of the first limit groove and the thickness H of the second limit groove of the limit connecting part 500 is too small, it will occur that after the position of the lower limit end of the 20 kg sensor is adjusted, the upper limit end has interference. If the difference between the length L of the first limit groove and the thickness H of the second limit groove of the limit connecting part 500 is too large, it will occur that after the position of the lower limit end of the 5 kg sensor is adjusted, the upper limit gap is too large. This will cause the upper limit end to fail to play the role of upper limit protection during transportation, and the upward deformation of the strain gauge sensor is very poor.

[0097] Therefore, in this embodiment, the length L (i.e., the spacing) of the first limit groove 511 and the thickness of the limit groove 420 need to satisfy the following relationship (obtained according to the dimensional chain calculation principle):

[0098] Z(1 + 10%) + D < L - H < 2(1 + 50%)X.

[0099] Where, Z represents the average full-load deflection of the strain gauge sensor with the maximum capacity that can be installed in the weighing module, L represents the length of the first limit groove, H represents the thickness of the second limit groove, X represents the average full-load deflection of the strain gauge sensor with the minimum capacity that can be installed in the weighing module, and D represents the compensation amount.

[0100] Here, the maximum capacity that can be installed in the weighing module can be 10 - 40 kg, and the minimum capacity can be 3 - 10 kg. D can be adjusted according to the capacity, with a range of 0.05 - 0.5 mm, preferably 0.08 - 0.2 mm, and more preferably 0.1 mm.

[0101] Generally speaking, the machining accuracy of the first limiting groove length L and the second limiting groove thickness H of the limiting connector 500 can be controlled within 0.05mm and between 110% and 150% of the rated load. This is the safe value for the use of the sensor.

[0102] In addition, refer to Figure 4 and Figure 5 To prevent the limiting connector 500 from loosening due to impacts and vibrations during transportation, which could cause changes in the limiting gap and affect the weighing module's metering performance under rated load, a threaded hole is made on one side of the limiting pad 600 to install a tapered set screw 610. The set screw 610 penetrates the limiting pad 600, and a certain torque is applied during installation to further securely lock the limiting connector 500, thus preventing it from loosening during transportation and avoiding limiting gap changes that could lead to limiting failure.

[0103] Based on the above structural design, the adjustment process of the limit gap of this strain gauge weighing module in a standard application is as follows: First, rotate the limit connector 500 to reduce the lower limit gap b. Then, apply a force of 150% of the rated load to the weighing pan 300 and read the weight value displayed by the sensor. Next, rotate the limit connector 500 again to increase the lower limit gap b, observing the weight displayed by the sensor while adjusting, until the target value is reached (generally between 110% and 150% of the rated load, which is the safe value for sensor use). Finally, tighten the set screw 610 to complete the adjustment and fixing of the limit gap.

[0104] Furthermore, in reverse installation applications of this utility model strain gauge weighing module, that is, compared to the forward installation applications mentioned above, the weighing module is inverted (base plate 100 on top, weighing pan 300 on the bottom), and the weighing pan 300 is stretched in the reverse direction to adjust the upper limit gap a to the target value (the adjustment method is the same as the adjustment method of the lower limit gap b mentioned above).

[0105] Furthermore, the upper pad 400 can preferably be configured as a stepped shape, with the second end 420 of the upper pad 400 fixed between the bearing end 210 of the strain sensor 200 and the weighing pan 300. The first end 410 of the upper pad 400 protrudes downward along the bottom of the second end 430, forming a protrusion 411.

[0106] Because high-precision weighing modules have multiple channels, their width and installation space are limited, necessitating a highly integrated limiting structure to save installation space. Therefore, this application places the limiting structure at the bearing end of the strain gauge sensor to save width space. Simultaneously, the upper pad is designed as a stepped structure; the downward-protruding structure provides sufficient strength while saving height space, enabling the limiting protection function to be achieved within a minimal space.

[0107] Furthermore, because the sensor's elastomer undergoes very small deformation under full load, it is highly sensitive to changes in the limiting gap. Additionally, the module has a generally elongated shape, and the structural rigidity of the housing 700 is significantly greater than that of the base plate 100. When the housing 700 is bolted onto the base plate 100 and torque is applied, the base plate 100 is prone to slight deformation due to the difference in flatness between the contact surfaces of the base plate 100 and the housing 700. This slight deformation causes a slight displacement of the limiting pad 600, ultimately altering the upper limiting gap a and the lower limiting gap b. This situation may reduce the normal weighing capacity or cause the limiting to exceed its protection range, thus failing to provide protection.

[0108] Therefore, as Figure 8 As shown, at least one side of the bottom of the housing 700 is provided with an elongated recessed groove 710. Preferably, the recessed groove 710 is provided on opposite sides of the bottom of the housing 700. More preferably, the recessed groove 710 is provided on the longest opposite sides of the bottom of the housing 700, or all four sides are provided with recessed grooves 710. In addition, protruding steps 720 are provided at both ends of the housing 700. The housing 700 is fixedly connected to the base plate 100 through the steps 720, for example, by providing multiple mounting threaded holes 721 on the steps 720 and fixing the housing 700 to the base plate 100 with fasteners. The recessed groove 710 creates a gap between the housing 700 and the base plate 100, preventing them from being completely fitted together. The housing 700 and the base plate 100 only contact each other through the small plane of the steps 720, which effectively reduces the deformation of the base plate 100 caused by assembly, thereby reducing the change in the limiting gap caused by the deformation of the base plate due to installation stress and enhancing the reliability of the limiting protection.

[0109] like Figure 9 As shown, the bottom of the base plate 100 has an opening groove 110. In this way, the bottom surface of the base plate 100 is in small-plane contact with the table surface of the customer's equipment, which reduces the possibility of deformation of the base plate 100 after fixing, thereby reducing the change of the limit gap caused by the deformation of the base plate due to installation stress and enhancing the reliability of the limit protection.

[0110] Meanwhile, a mounting boss 120 is provided on the base plate 100, and a limiting step 130 is provided on the mounting boss 120. The strain sensor 200 is fixed on the mounting boss 120, and the limiting pad 600 is fixed on the limiting step 130, making the positioning and installation of the limiting pad 600 more convenient.

[0111] In addition, a bubble level 140 can be installed on the base plate 100 to detect the levelness of the base plate 100.

[0112] Based on the above structural description, this utility model's strain gauge weighing module, by limiting the forward and reverse deformation of the strain gauge sensor (i.e., the elastic body), serves as a transportation and overload protection mechanism. During the transportation, installation, and commissioning of the weighing module with the integrated equipment, it provides transportation and overload protection for the strain gauge sensor. Furthermore, the weighing module features an adjustable upper and lower limit gap structure, allowing multiple capacity sensors to use a unified limit device, reducing the number of material types and facilitating easier assembly.

[0113] In summary, the strain gauge weighing module of this invention has the following advantages:

[0114] I. An internal limit protection structure is set up to realize overload protection and transportation protection for the single-point strain gauge weighing module;

[0115] Second, the upper and lower limits of the limiting structure are adjustable, which can meet the application scenarios of weighing modules installed in both the forward and reverse directions. At the same time, it also enables multiple capacity sensors to use a unified limiting device, thereby reducing the types and quantities of materials and making assembly more convenient.

[0116] Third, the limit screw is locked with a set screw, making the limit protection more reliable;

[0117] IV. The highly integrated limit protection structure saves space for the weighing module and is suitable for multi-channel arrangements.

[0118] Fifth, an open slot structure is designed on the shell and the base plate to reduce the deformation of the base plate caused by installation gravity and reduce the impact on the limit protection.

[0119] For those skilled in the art, the above disclosure of utility models is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0120] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic related to at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0121] Similarly, it should be noted that, in order to simplify the description of the embodiments disclosed in this application and thus aid in the understanding of one or more embodiments of the utility model, the foregoing description of the embodiments of this application sometimes combines multiple features into one embodiment, drawing, or description thereof. However, this disclosure method does not mean that the object of this application requires more features than those mentioned in the claims. In fact, the embodiments have fewer features than all the features of the single embodiments disclosed above. Some embodiments use numbers describing the number of components or attributes; it should be understood that such numbers used in the description of embodiments are modified in some examples by the modifiers "approximately," "about," or "generally."

[0122] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model 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 this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A strain gauge weighing module, characterized in that, The strain gauge weighing module includes: A base plate and a strain gauge sensor, wherein the strain gauge sensor is fixed on the base plate; An upper pad is fixed to the bearing end of the strain gauge sensor, and the first end of the upper pad extends outward to the outside of the strain gauge sensor. A limiting connector has a first limiting groove, the first end of the upper pad is partially accommodated in the first limiting groove, and the lower part of the limiting connector is connected to the base plate. An upper limit gap is formed between the first limiting groove and the upper end face of the first end of the upper pad block, and a lower limit gap is formed between the first limiting groove and the lower end face of the first end of the upper pad block. The height of the first limiting groove of the limiting connector relative to the base plate is adjustable, so that the upper limiting gap and the lower limiting gap are adjustable.

2. The strain gauge load module of claim 1 wherein, The strain gauge weighing module also includes a limiting pad, which is fixed on the base plate and located below the first end of the upper pad. The lower part of the limiting connector is connected to the limiting pad.

3. The strain gauge load module of claim 1 wherein, The limiting connector includes an upper limiting end and a lower limiting end, which are arranged vertically at intervals. The upper limiting end and the lower limiting end can be adjusted by adjusting their positions.

4. The strain gauge load module of claim 3 wherein, The limiting connector also includes a connecting rod, the upper limiting end and the lower limiting end are mounted on the connecting rod, and the part of the connecting rod located below the lower limiting end is a threaded section, which is threadedly connected to the limiting pad.

5. The strain gauge load module of claim 4 wherein, The upper limit end, the lower limit end and the connecting rod form a first limiting groove, and the first end of the upper pad is provided with a second limiting groove. The first limiting groove and the second limiting groove are correspondingly matched, so that the upper limit end is located above the second limiting groove, and the two form the upper limit gap. The lower limit end is located below the second limit groove, and the two form the lower limit gap.

6. The strain gauge load module of claim 5 wherein, The length of the first limiting groove and the thickness of the second limiting groove satisfy the following relationship: Z(1+10%)+D <L-H<2(1+50%)X; Where Z represents the average full-load deflection of the strain gauge sensor with the largest capacity that can be installed in the weighing module, L represents the length of the first limiting groove, H represents the thickness of the second limiting groove, X represents the average full-load deflection of the strain gauge sensor with the smallest capacity that can be installed in the weighing module, and D represents the compensation amount.

7. The strain gauge load module of claim 3 wherein, The outer wall surface of the lower limit end is polygonal.

8. The strain gauge load module of claim 1 wherein, The upper pad is stepped, and the second end of the upper pad is fixed to the bearing end of the strain sensor. The first end of the upper pad protrudes downward along the bottom of the second end.

9. The strain gauge load module of claim 2 wherein, The side of the limiting pad is also provided with a set screw, which is used to tighten the side of the limiting connector.

10. The strain gauge load module of claim 1 wherein, The strain gauge weighing module also includes a housing, which covers the outside of the strain gauge sensor. The bottom of the housing is fixedly connected to the base plate, and at least one side of the bottom of the housing is provided with a sinking groove.

11. The strain gauge load module of claim 1 wherein, The bottom of the base plate has an opening groove.

12. The strain gauge load module of claim 2 wherein, The bottom plate is further provided with a mounting boss, a limiting step is arranged on the mounting boss, the strain sensor is fixed on the mounting boss, and the limiting pad is fixed on the limiting step.

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