Structure of a magnetically resistant weighing device

Abstract

The utility model belongs to domestic weighing apparatus technical field, concretely relates to a structure of anti -magnetic weighing device. The utility model discloses: lower support module, lower bearing plate, horizontal adhesion is established in lower support module, pressure sensor, be established on lower bearing plate, and one end bottom surface of pressure sensor is connected with the top surface horizontal adhesion of lower support module, upper support module, is established in the upper of pressure sensor, upper bearing plate, horizontal adhesion is established in upper support module, and the bottom surface of upper bearing plate is connected with the top surface horizontal adhesion of another end of pressure sensor, and the material of lower bearing plate is engineering plastics or non -magnetic steel. The utility model is used to solve the technical problem that the metal reinforcing piece of existing weighing device uses cold rolled steel plate to manufacture and exists the influence weighing accuracy of springback deformation, and the influence weighing accuracy when weighing the object with magnetism.

Description

Technical Field

[0001] This utility model belongs to the field of household weighing instrument technology, specifically relating to the structure of an antimagnetic weighing device. Background Technology

[0002] Current weighing devices generally consist of an upper housing, a lower housing, and a pressure sensor. The pressure sensor is located between the upper and lower housings, with one end of the pressure sensor connected to the upper housing on its top surface and the other end connected to the lower housing on its bottom surface. When the upper housing carries the object being weighed, the force is transmitted to the pressure sensor. The two ends of the pressure sensor are subjected to upward and downward forces, respectively, causing the pressure sensor to deform and generate a corresponding electrical signal. The electrical signal is input to the PCB board, which uses analog circuitry to determine the mass of the object being weighed and displays it on the display screen on the upper housing.

[0003] To ensure weighing accuracy, the upper and lower shells need to have good rigidity and not deform under stress. Therefore, metal reinforcing blocks are set inside the upper and lower shells respectively. However, due to cost constraints, the existing metal reinforcing blocks are generally made of cold-rolled steel plates by stamping. However, during the stamping process, the metal reinforcing blocks may spring back or deform, causing them to not fit flatly with the upper and lower shells, thus affecting the measurement accuracy.

[0004] Furthermore, in actual use, the weighing device produces a large weighing error when the object being weighed is magnetic. The magnetic object exerts an attractive force on the metal reinforcing block in the lower housing, which means that the force on the pressure sensor is the sum of the weight of the object being weighed and the magnetic attraction force, resulting in inaccurate weighing results. Utility Model Content

[0005] This utility model provides a structure for an antimagnetic weighing device, which solves the technical problems of existing weighing devices using metal reinforcing blocks made of cold-rolled steel plates, which have springback deformation affecting weighing accuracy, and also affect weighing accuracy when weighing magnetic objects.

[0006] This utility model includes: a lower support module;

[0007] The lower support plate is horizontally fitted inside the lower support module;

[0008] A pressure sensor is mounted on the lower support plate, with one bottom surface of the pressure sensor horizontally attached to the top surface of the lower support module.

[0009] The upper support module is located above the pressure sensor;

[0010] The upper support plate is horizontally fitted inside the upper support module, and the bottom surface of the upper support plate is horizontally fitted and connected to the top surface of the other end of the pressure sensor.

[0011] The lower support plate is made of engineering plastic or non-magnetic steel.

[0012] The lower support plate of this invention has good rigidity and will not deform. It can fit well with the lower support module and will not be affected by magnetic objects, thus not affecting the weighing accuracy of the weighing device.

[0013] Furthermore: when the material of the lower bearing plate is austenitic stainless steel;

[0014] The lower support plate is provided with two first positioning protrusions and one clearance protrusion. The bottom surfaces of the first positioning protrusions and the clearance protrusions correspond to the grooves of the lower support module, and the top surface of the clearance protrusions corresponds to the upper support plate.

[0015] The lower bearing plate, excluding the first positioning protrusion and the relief protrusion, also has an array of stress-relieving holes on its top surface.

[0016] The stress-relieving holes have a diameter of φ1mm and a depth of 0.05mm. The row spacing and column spacing of the stress-relieving holes are both 2mm. The beneficial effects of this step are: austenitic stainless steel is non-magnetic and will not be affected by magnetic interference, and will not apply additional pressure to the pressure sensor, so it will not affect the weighing accuracy when weighing magnetic objects; the stress-relieving holes are used to eliminate the stamping stress of the lower bearing plate and ensure that the lower bearing plate is flat and does not deform.

[0017] Furthermore: the upper support plate is provided with a second positioning protrusion in the middle, and the side of the second positioning protrusion facing the center of the pressure sensor is also provided with a clearance groove;

[0018] When the upper support plate is made of metal, the side of the second positioning protrusion facing the pressure sensor and the top surface of the upper support plate excluding the second positioning protrusion are provided with an array of stress-relieving holes. The beneficial effect of this step is to ensure that the upper support plate does not deform.

[0019] Furthermore, the edge of the relief groove is provided with an upward-curved edge. The beneficial effect of this step is to improve the structural strength of the second positioning convex hull and avoid deformation.

[0020] Furthermore: the lower support plate has several downward flanges on its edge. The beneficial effects of this step are: in addition to improving the structural strength of the lower support plate, the downward flanges can also be adapted to the slots of the lower support module. The slots allow the downward flanges to be inserted, which can serve to position the lower support plate in the lower support module.

[0021] Furthermore, the relief convex hull also has a relief hole, which has the following advantages: the relief hole allows other parts inside the weighing device to pass through.

[0022] Furthermore, the bottom surface of the second positioning convex hull is provided with a plurality of convex cylinders, and the plurality of convex cylinders respectively correspond to the two sides of the pressure sensor. The beneficial effect of this step is that the convex cylinders are used to assist in the positioning of the pressure sensor.

[0023] The beneficial effects of this utility model are:

[0024] 1. This utility model uses non-magnetic engineering plastics or non-magnetic steel as a substitute for cold-rolled steel plates. The resulting reinforcing block can ensure the weighing accuracy of the weighing device when weighing magnetic or non-magnetic items.

[0025] 2. When using austenitic stainless steel as the material for the reinforcing block, this utility model also removes the stamping stress during the stamping of the reinforcing block by setting an array of stress-relieving holes on the top and / or bottom surfaces of the reinforcing block, ensuring that the reinforcing block is flat and will not affect the measurement accuracy of the weighing device. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 Exploded view of the structure of an antimagnetic weighing device provided by this utility model;

[0028] Figure 2 for Figure 1 Mirror image;

[0029] Figure 3 Exploded view of the upper support plate, pressure sensor and lower support plate in the structure of the antimagnetic weighing device provided by this utility model;

[0030] Figure 4 for Figure 3 A mirror image.

[0031] Figure label:

[0032] 1-Lower support module; 2-Lower support plate; 3-Pressure sensor; 4-Upper support module; 5-Upper support plate;

[0033] 21-First positioning convex hull; 22-Displacement convex hull; 23-Stress relief hole; 24-Lower flange; 51-Second positioning convex hull; 52-Displacement groove; 53-Upper flange; 54-Convex cylinder;

[0034] 221 - Displacement hole. Detailed Implementation

[0035] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0036] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0037] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly defined.

[0038] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] Examples of embodiments of this utility model Figures 1-4 As shown, the structure of the antimagnetic weighing device provided by this utility model not only ensures weighing accuracy through the horizontally fitted assembly structure, but also ensures weighing accuracy by not generating magnetic force with magnetic objects.

[0040] This utility model includes: a lower support module 1;

[0041] The lower support plate 2 is horizontally fitted inside the lower support module 1;

[0042] Pressure sensor 3 is mounted on the lower support plate 2, and one end of the bottom surface of the pressure sensor 3 is horizontally attached to the top surface of the lower support module 1.

[0043] The upper support module 4 is located above the pressure sensor 3;

[0044] The upper support plate 5 is horizontally fitted inside the upper support module 4, and the bottom surface of the upper support plate 5 is horizontally fitted and connected to the top surface of the other end of the pressure sensor 3.

[0045] The material of the lower support plate 2 is engineering plastic or non-magnetic steel; engineering plastics generally include polycarbonate, polyamide, polyoxymethylene, polyphenylene ether, polyphenylene sulfide, etc. The above materials have good rigidity and can generally be made by injection molding or machining.

[0046] The lower support plate 2 of this utility model has good rigidity and will not deform. It can fit well with the lower support module 1. The upper support plate 5 and the upper support module 4 are also horizontally fitted without gaps, which can reduce weighing errors. Furthermore, the lower support plate 2 will not be affected by magnetic objects, and ultimately will not affect the weighing accuracy of the weighing device.

[0047] Based on the above technical solution, among many non-magnetic steels, austenitic stainless steel is a relatively economical steel type with good processing performance. Austenitic stainless steel is non-magnetic and will not be affected by magnetic interference. It will not apply additional pressure to the pressure sensor 3, so it will not affect the weighing accuracy when weighing magnetic objects. Therefore, when the material of the lower support plate 2 is austenitic stainless steel.

[0048] The lower support plate 2 is provided with two first positioning protrusions 21 and one clearance protrusion 22. The bottom surfaces of the first positioning protrusions 21 and the clearance protrusion 22 correspond to the grooves of the lower support module 1, respectively. The first positioning protrusions 21 serve to assist in the assembly with the lower support module. The top surface of the clearance protrusion 22 corresponds to the upper support plate 5. The clearance protrusion 22 has space to avoid the downward deformation of the pressure sensor 3, so it will not interfere with the pressure sensor 3 and will not affect the weighing accuracy of the pressure sensor 3.

[0049] The top surface of the lower support plate 2, excluding the first positioning protrusion 21 and the relief protrusion 22, is also provided with an array of stress-relieving holes 23.

[0050] The stress-relieving hole 23 has a diameter of φ1mm and a depth of 0.05mm. The row spacing and column spacing of the stress-relieving hole 23 are both 2mm. The stress-relieving hole 23 can eliminate the stamping stress of the lower bearing plate 2 and ensure that the lower bearing plate 2 is flat and does not deform.

[0051] Based on the above technical solution, the upper support plate 5 is provided with a second positioning protrusion 51 in the middle, and the second positioning protrusion 51 is also provided with a relief groove 52 on the side facing the center of the pressure sensor 3, and the relief groove 52 avoids the protrusion in the middle position of the pressure sensor 3.

[0052] When the upper support plate 5 is made of metal, the upper support plate 5 itself does not need to have an antimagnetic effect. It can be cold-rolled steel plate or austenitic stainless steel plate, or other types of metal plates. However, regardless of the specific metal plate of the upper support plate 5, the upper support plate 5 is preferably processed by stamping. Therefore, the second positioning protrusion 51 facing the pressure sensor 3 and the top surface of the upper support plate 5 excluding the second positioning protrusion 51 are provided with an array of stress relief holes 23. The setting parameters of the stress relief holes 23 are the same as those above, which also ensures that the upper support plate 5 does not deform.

[0053] Based on the above technical solution, the edge of the relief groove 52 is provided with an upturned edge 53, which improves the structural strength of the second positioning protrusion 51 and avoids deformation.

[0054] Based on the above technical solution, the lower support plate 2 is provided with several lower flanges 24 on its edge. In addition to improving the structural strength of the lower support plate 2, the lower flanges 24 can also be adapted to the slots of the lower support module 1. The slots allow the lower flanges 24 to be inserted, which can serve to position the lower support plate 2 in the lower support module 1.

[0055] Based on the above technical solution, the relief convex 22 is also provided with a relief hole 221, which allows other parts inside the weighing device to pass through.

[0056] Based on the above technical solution, the bottom surface of the second positioning convex bulge 51 is provided with a plurality of convex cylinders 54, and the plurality of convex cylinders 54 respectively correspond to the two sides of the pressure sensor 3, and the pressure sensor 3 is positioned by means of the convex cylinders 54.

[0057] In the above embodiments of this invention, both the upper support module 4 and the lower support module 1 are equipped with conventional components such as a PCB board, power cord, battery compartment, and display screen. Both the upper support module 4 and the lower support module 1 are made of plastic housing, which reduces the overall weight and cost. In all the above embodiments, the non-magnetic lower support plate 2 achieves anti-magnetic weighing, ensuring weighing accuracy when weighing magnetic objects.

[0058] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of this invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification. In the description of this specification, references to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. The structure of an antimagnetic weighing device, characterized in that, include: Lower support module; The lower support plate is horizontally fitted inside the lower support module; A pressure sensor is mounted on the lower support plate, with one bottom surface of the pressure sensor horizontally attached to the top surface of the lower support module. The upper support module is located above the pressure sensor; The upper support plate is horizontally fitted inside the upper support module, and the bottom surface of the upper support plate is horizontally fitted and connected to the top surface of the other end of the pressure sensor. The lower support plate is made of engineering plastic or non-magnetic steel.

2. The structure of the antimagnetic weighing device according to claim 1, characterized in that, When the material of the lower bearing plate is austenitic stainless steel; The lower support plate is provided with two first positioning protrusions and one clearance protrusion. The bottom surfaces of the first positioning protrusions and the clearance protrusions correspond to the grooves of the lower support module, and the top surface of the clearance protrusions corresponds to the upper support plate. The lower bearing plate, excluding the first positioning protrusion and the relief protrusion, also has an array of stress-relieving holes on its top surface. The stress-relieving holes have a diameter of φ1mm and a depth of 0.05mm, and the row spacing and column spacing of the stress-relieving holes are both 2mm.

3. The structure of the antimagnetic weighing device according to claim 2, characterized in that, The upper support plate is provided with a second positioning protrusion in the middle, and the side of the second positioning protrusion facing the center of the pressure sensor is also provided with a clearance groove. When the upper support plate is made of metal, the side of the second positioning protrusion facing the pressure sensor and the top surface of the upper support plate excluding the second positioning protrusion are provided with an array of stress-relieving holes.

4. The structure of the antimagnetic weighing device according to claim 3, characterized in that, The edge of the relief groove is provided with an upward-turned edge.

5. The structure of the antimagnetic weighing device according to claim 1 or 2, characterized in that, The lower support plate has several downward-curved edges.

6. The structure of the antimagnetic weighing device according to claim 2, characterized in that, The relief convex hull also has relief holes.

7. The structure of the antimagnetic weighing device according to claim 3, characterized in that, The bottom surface of the second positioning convex bulge is provided with a plurality of convex cylinders, and the plurality of convex cylinders respectively correspond to the two sides of the pressure sensor.

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