CN222318180U - Load Cells - Google Patents
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- CN222318180U CN222318180U CN202421110661.5U CN202421110661U CN222318180U CN 222318180 U CN222318180 U CN 222318180U CN 202421110661 U CN202421110661 U CN 202421110661U CN 222318180 U CN222318180 U CN 222318180U
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- 239000011888 foil Substances 0.000 claims abstract description 89
- 239000002184 metal Substances 0.000 claims abstract description 86
- 229910052751 metal Inorganic materials 0.000 claims abstract description 86
- 238000005303 weighing Methods 0.000 claims abstract description 64
- 229920001971 elastomer Polymers 0.000 claims abstract description 32
- 239000000806 elastomer Substances 0.000 claims abstract description 31
- 239000010410 layer Substances 0.000 claims description 167
- 239000000853 adhesive Substances 0.000 claims description 42
- 230000001070 adhesive effect Effects 0.000 claims description 42
- 239000012790 adhesive layer Substances 0.000 claims description 28
- 239000012212 insulator Substances 0.000 claims description 19
- 239000011241 protective layer Substances 0.000 claims description 12
- 229910001006 Constantan Inorganic materials 0.000 claims description 8
- 238000005259 measurement Methods 0.000 abstract description 20
- 238000012545 processing Methods 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 239000000758 substrate Substances 0.000 description 19
- 238000012546 transfer Methods 0.000 description 12
- 239000011248 coating agent Substances 0.000 description 9
- 238000000576 coating method Methods 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 230000035945 sensitivity Effects 0.000 description 9
- 229920002379 silicone rubber Polymers 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 239000013039 cover film Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 4
- 239000010408 film Substances 0.000 description 4
- -1 polytetrafluoroethylene Polymers 0.000 description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000005488 sandblasting Methods 0.000 description 3
- 239000000741 silica gel Substances 0.000 description 3
- 229910002027 silica gel Inorganic materials 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000005062 Polybutadiene Substances 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229920006332 epoxy adhesive Polymers 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920002857 polybutadiene Polymers 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 229920003225 polyurethane elastomer Polymers 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Measurement Of Force In General (AREA)
Abstract
The utility model discloses a weighing sensor, which relates to the technical field of weighing sensors, wherein the weighing sensor comprises a metal foil layer, bonding layers and an elastomer, wherein sensitive grids are formed on the metal foil layer, the number of the metal foil layer is two, the number of the bonding layers is two, the two bonding layers are respectively connected with two sides of the elastomer, the two metal foil layers are respectively connected with one sides, away from the elastomer, of the two bonding layers, and the two sensitive grids are connected through a wire. The manufacturing method of the weighing sensor comprises the steps of processing and forming the sensitive grids on the two metal foil layers, bonding the metal foil layers and the elastic body through the bonding layer, and connecting the two sensitive grids through the lead, so that the manufacturing of the weighing sensor is completed, the whole weighing sensor has a three-layer structure, the loss of stress transmission is effectively reduced, the strain coefficient is improved, the measurement accuracy is improved, and the measurement error is greatly reduced.
Description
Technical Field
The utility model relates to the technical field of weighing sensors, in particular to a weighing sensor.
Background
At present, the manufacturing principle of the weighing sensor is that the finished product of a conventional strain gauge is stuck on an elastic body, then an electric bridge is formed, and testing, compensation and protection are carried out. In the conventional method for manufacturing the weighing sensor, a layer of adhesive is coated between the elastic body and the strain gauge. The strain gauge is adhered to form a five-layer strain test structure, which comprises a patch adhesive, a substrate, an adhesive, a foil and a cover film from an elastomer.
The strain of the conventional weighing sensor is generated on the surface of the elastic body after the elastic body is loaded, the strain is transferred to the substrate through the adhesive, the substrate is transferred to the adhesive, the adhesive is transferred to the sensitive grid, a strain gauge transfer level is formed, the strain is measured through the voltage change of the Wheatstone bridge formed by the sensitive grid through the resistance change of the sensitive grid, thus weighing measurement is realized, the elastic modulus of the substrate and the adhesive is greatly different from that of the sensitive grid material, deformation errors occur in the transfer process, and larger measurement errors are caused.
Therefore, it is necessary to provide a new load cell to solve the above technical problems.
Disclosure of utility model
The utility model mainly aims to provide a weighing sensor, which aims to solve the technical problem of larger measurement error of the weighing sensor in the prior art.
In order to achieve the above object, the present utility model provides a load cell, comprising:
the metal foil layer is provided with sensitive grids, and the number of the metal foil layers is two;
The number of the bonding layers is two;
And the two metal foil layers are respectively connected with one sides of the two bonding layers, which deviate from the elastic body, and the two sensitive grids are connected through wires.
In an embodiment, the bonding layer comprises an interconnecting insulating sub-layer and a bonding sub-layer, wherein one side of the insulating sub-layer away from the bonding sub-layer is connected with the elastomer, and one side of the bonding sub-layer away from the insulating sub-layer is connected with one side of the metal foil layer away from the sensitive grid.
In one embodiment, the metal foil layer is a constantan alloy layer.
In one embodiment, the metal foil layer has a thickness in the range of 3 μm to 5 μm.
In one embodiment, the surface of the elastic body is formed with a frosted surface.
In one embodiment, the area of the insulator layer is greater than the area of the metal foil layer.
In one embodiment, the metal foil layer has a size that is 2 to 3 times the size of the sensitive grid.
In one embodiment, the surfaces of the sensitive grids are all coated with a protective layer.
In one embodiment, the protective layer has a thickness in the range of 1mm to 3mm.
The utility model also provides a manufacturing method of the weighing sensor, which is applied to the weighing sensor, and comprises the following steps:
Performing vacuum heat treatment on the metal foil layer, cutting the metal foil layer after heat treatment, and removing an oxide layer on the surface of the metal foil layer after vacuum heat treatment;
Coating two sides of the elastic body with insulating sub-layers, coating one side of the insulating sub-layers, which is away from the elastic body, with adhesive sub-layers, adhering two metal foil layers to the two adhesive sub-layers, solidifying, processing one side of the metal foil layers, which is away from the adhesive sub-layers, to form a sensitive grid, and adjusting the resistance value of the sensitive grid;
coating the surface of the sensitive grid to form a protective layer;
And connecting the sensitive grids through wires to form a Wheatstone bridge so as to form the weighing sensor.
In the scheme, the weighing sensor comprises metal foil layers, bonding layers and an elastomer, wherein sensitive grids are formed on the metal foil layers, the number of the metal foil layers is two, the number of the bonding layers is two, the two bonding layers are respectively connected with two sides of the elastomer, the two metal foil layers are respectively connected with one sides, away from the elastomer, of the two bonding layers, and the two sensitive grids are connected through wires. The weighing sensor in the prior art is made of a five-layer structure of a patch adhesive, a substrate, an adhesive layer, a foil and a cover film, the weighing sensor in the technical scheme of the utility model is not made of a finished strain gauge, but is made of two metal foil layers, then the metal foil layers and an elastomer are bonded through the adhesive layer, and then the two sensitive grids are connected through a wire, so that the manufacturing of the weighing sensor is completed, the whole weighing sensor has a three-layer structure, when the weighing sensor is used, the strain of the elastomer is transferred to the sensitive grids through the adhesive layer, and thus, the strain of the elastomer is transferred through only one adhesive layer, thereby avoiding the influence of strain transfer caused by different expansion coefficients of the substrate, the cover film and the patch adhesive and the temperature influence caused by temperature change in the prior art, effectively reducing the loss of stress transfer, improving the strain coefficient, thereby improving the measurement accuracy and greatly reducing the measurement error.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of an embodiment of a weighing sensor according to the present utility model;
FIG. 2 is a schematic diagram of an embodiment of a weighing sensor according to the present utility model with a sensor grid not connected;
FIG. 3 is a schematic view of an embodiment of a weighing sensor according to the present utility model;
FIG. 4 is a schematic view of an embodiment of a load cell according to the present utility model;
FIG. 5 is a cross-sectional view of one embodiment of a load cell provided by the present utility model;
Fig. 6 is a schematic diagram of an embodiment of a sensitive gate according to the present utility model.
Reference numerals illustrate:
100. Weighing sensor 1, metal foil layer 2, adhesive layer 3, elastomer 11, first sensitive grid 21, insulator layer 22, adhesive layer.
The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear are referred to in the embodiments of the present utility model), the directional indications are merely used to explain the relative positional relationship, movement conditions, and the like between the components in a specific posture, and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if "and/or" and/or "are used throughout, the meaning includes three parallel schemes, for example," a and/or B "including a scheme, or B scheme, or a scheme where a and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
The strain of the conventional weighing sensor is generated on the surface of the elastic body 3 after the elastic body is loaded, the strain is transferred to the substrate through the adhesive, the substrate is transferred to the adhesive, the adhesive is transferred to the sensitive grid, a strain gauge transfer level is formed, the strain is measured through the voltage change of the Wheatstone bridge formed by the sensitive grid through the resistance change of the sensitive grid, thus weighing measurement is realized, the elastic moduli of the substrate and the adhesive are greatly different from those of the sensitive grid material, deformation errors occur in the transfer process, and larger measurement errors are caused.
Referring to fig. 1 to 6, the present utility model provides a weighing sensor 100, which comprises a metal foil layer 1, an adhesive layer 2 and an elastomer 3, wherein sensitive grids 11 are formed on the metal foil layer 1, the number of the metal foil layer 1 is two, the number of the adhesive layer 2 is two, the two adhesive layers 2 are respectively connected with two sides of the elastomer 3, the two metal foil layers 1 are respectively connected with one sides of the two adhesive layers 2 away from the elastomer 3, and the two sensitive grids 11 are connected through wires. The weighing sensor 100 in the prior art is made of a five-layer structure of a patch adhesive, a substrate, an adhesive layer, a foil and a cover film, the weighing sensor 100 in the technical scheme of the utility model is not made of a finished strain gauge, but is made of two metal foil layers 1, the metal foil layers 1 and an elastic body 3 are bonded through the adhesive layer 2, and then the two sensitive grids 11 are connected through a wire, so that the manufacturing of the weighing sensor 100 is completed, the whole weighing sensor 100 has a three-layer structure, when the weighing sensor 100 is used, the strain of the elastic body 3 is transferred to the sensitive grids 11 through the adhesive layer 2, so that the strain of the elastic body 3 only needs to be transferred through one layer of the adhesive layer 2, the influence of strain transfer caused by different expansion coefficients of the substrate, the cover film and the patch adhesive in the prior art and the temperature influence caused by temperature change are avoided, the loss of the stress transfer is effectively reduced, the strain coefficient is improved, and the measurement accuracy is greatly reduced.
Specifically, the relationship between the sensitivity coefficient K of the load cell 100 and the sensitivity of the sensitive gate material can be expressed by the following formula:
K=K0/{1+4h/Z×h×A/L(1+ub)×Eo/Eh}
h is the total thickness of the substrate, the adhesive and the adhesive layer, Z is the effective width of the transition area, b is the effective length of the transition area, A is the wire grid sectional area of the sensitive grid, L is the grid length of the sensitive grid, ub is the Poisson ratio of the substrate and the adhesive layer, eo is the elastic modulus of the substrate and the adhesive layer, eh is the elastic modulus of the sensitive grid;
From the above formula, it can be seen that the total thickness of the substrate and the adhesive, poisson ratio of the substrate and the adhesive layer, and elastic modulus of the substrate and the adhesive layer affect the sensitivity coefficient of the resistance strain gauge of the strain gauge, and further affect strain transmission, so that the number of transmission layers between the sensitive grating and the elastic body 3 is reduced, which is beneficial to stability of the weighing sensor 100 and accuracy of strain measurement, and improves temperature and creep stability of the weighing sensor 100.
Further, in the prior art, the adhesive between the metal foil layer 1 and the substrate and the adhesive of the strain gauge are all high polymer materials, and the adhesive in the strain gauge and the adhesive layer of the adhesive adopted for adhering the strain gauge have certain thicknesses, and the errors are differences caused by the adhesive, so that the zero temperature performance, the sensitivity temperature performance, the creep and creep recovery performance of the sensor have large deviation and large discreteness. The sensitive grid is directly processed on the elastic body 3, so that the number of layers of the patch is reduced, the number of layers of the weighing sensor 100 is reduced, the zero temperature performance, the sensitivity temperature performance, the creep and the creep recovery performance of the weighing sensor 100 are greatly improved, the deviation is reduced, and the discreteness is reduced.
Referring to fig. 1 to 6, in one embodiment, the adhesive layer 2 includes an insulating sub-layer 21 and an adhesive sub-layer 22 connected to each other, wherein a side of the insulating sub-layer 21 facing away from the adhesive sub-layer 22 is connected to the elastic body 3, and a side of the adhesive sub-layer 22 facing away from the insulating sub-layer 21 is connected to a side of the metal foil layer 1 facing away from the sensitive grid 11. Specifically, the two sides of the elastic body 3 are scraped with epoxy adhesive by using a scraping plate to form an insulator layer 21, the thickness of the insulator layer 21 is generally 3 mu m, then the insulator layer 21 is dried in the air, the area of the insulator layer 21 is generally larger than that of the metal foil layer 1, then a thin adhesive layer is brushed on the dried insulator layer 21 to form an adhesive sub-layer 22, the metal foil layer 1 is covered on the adhesive sub-layer 22, and air bubbles in the metal foil layer 1 are extruded. The metal foil layer 1 is adhered on the adhesive sub-layer 22 and then is pressed for first solidification, the first solidification method is that a silicon rubber plate is covered on the metal foil layer 1, a polytetrafluoroethylene film is filled between the silicon rubber plate and the metal foil layer 1, the area of the polytetrafluoroethylene film filled is larger than the area of the metal foil layer 1 and the silicon rubber, a stainless steel plate is filled on the silicon rubber plate, the pressure is applied to a stainless steel backing plate for 3MPa, the temperature is set at 125 ℃, and the heat preservation is carried out for 4 hours. After the completion of the first curing, the elastomer 3 after the first curing was depressurized, and subjected to a second curing in a curing oven at a temperature set at 186 ℃ and heat-preserved for 2 hours. Through the arrangement, insulation can be carried out between the metal foil layer 1 and the elastic body 3, normal operation of the weighing sensor 100 is guaranteed, and meanwhile, the service life and the precision of the weighing sensor 100 can be prolonged.
In one embodiment, the metal foil layer 1 is a constantan alloy layer. The constantan alloy has the characteristics of lower temperature coefficient of resistance, wider use temperature range (below 480 ℃), good machining performance, high corrosion resistance and easy brazing, and can be used for a long time in severe environments such as ocean. The constantan alloy has better corrosion resistance and high-temperature performance, and can keep stable performance in long-term use. Constantan alloys have higher strength than pure copper and many other copper alloys, with extremely high tensile and yield strengths. Meanwhile, the constantan alloy has similar conductive performance to pure copper and is superior to many other strength materials.
In one embodiment, the thickness of the metal foil layer 1 ranges from 3 μm to 5 μm. The thickness of the metal foil layer 1 is different from the thickness of the metal foil layer 1 according to different measurement requirements, but the greater the thickness of the metal foil layer 1 is, the lower the precision is, the smaller the thickness is, the smaller the measurement range is, the more sensitive the measurement is, and when the thickness range of the metal foil layer 1 is 3-5 mu m, the larger range can be ensured, the certain precision is ensured, and the measurement accuracy is ensured.
In one embodiment, the elastic body 3 is formed with frosting on both sides. The surface of the elastic body 3 is treated with abrasive particles, which may be of various hardness and shape, such as circular, oval, polygonal, etc., by coating or spraying the surface of the elastic body 3 with abrasive particles. The surface sanding treatment can improve the aesthetic property, the wear resistance and the oil resistance of the elastomer 3, and can increase the friction coefficient of the surface of the elastomer 3 to a certain extent, thereby improving the application range and the performance of the elastomer 3, and simultaneously improving the bonding firmness.
In one embodiment, the area of the insulator layer 21 is greater than the area of the metal foil layer 1. The area of the insulating sub-layer 21 is larger than that of the metal foil layer, so that the metal foil layer 1 can be completely insulated from the elastic body 3, normal operation of the weighing sensor 100 is further guaranteed, and the service life and accuracy of the weighing sensor 100 are further prolonged.
In one embodiment, the metal foil layer 1 has a size that is 2 to 3 times the size of the sensitive grid 11. The size of the metal foil layer 1 is set to be 2 to 3 times of the size of the sensitive grating 11, so that the heat dissipation condition of the sensitive grating 11 is improved, the sensitivity can be improved, and the power of an output signal can be improved by allowing a larger current to pass. According to the required size of the sensitive grating 11, selecting a metal foil layer with the size 2 to 3 times larger than the size of the sensitive grating 11, so that enough allowance can be formed during processing, and the normal processing of the sensitive grating 11 is ensured.
In one embodiment, the surface of the sensor grid 11 is coated with a protective layer. Specifically, the protective layer is provided to protect the sensitive grid 11 from damage, so that the service life of the weighing sensor 100 is greatly prolonged, and in general, the protective layer is made of materials such as silica gel, polyurethane, and butadiene rubber.
In one embodiment, the thickness of the protective layer ranges from 1mm to 3mm. Specifically, in order to improve the protection capability of the protection layer, a certain thickness is required for the protection layer, but the accuracy of the weighing sensor 100 is affected by the excessive thickness, and when the thickness range of the protection layer is 1mm to 3mm, the protection capability of the protection layer can be improved while the accuracy of the weighing sensor 100 is not seriously affected.
In one embodiment, the thickness of the adhesive layer 2 ranges from 1 μm to 3 μm. The thickness of the bonding layer 2 is different from the thickness of the bonding layer 2 according to different measurement requirements, but the thicker the bonding layer 2 is, the lower the precision is, and the smaller the thickness is, the insulation failure between the metal foil layer 1 and the bonding layer 2 can be caused, so that the weighing sensor is damaged, when the thickness range of the bonding layer 2 is 1 mu m to 3 mu m, certain precision is ensured, and meanwhile, the insulation effect between the metal foil layer 1 and the bonding layer 2 is ensured.
The manufacturing method of the weighing sensor comprises the following steps:
Carrying out vacuum heat treatment on the metal foil layer 1, cutting the heat-treated metal foil layer 1, and removing an oxide layer on the surface of the vacuum heat-treated metal foil layer 1;
According to different use requirements and use environments, processing and forming the elastomer 3 according to the design requirements, carrying out corresponding heat treatment on the elastomer 3, carrying out sand blasting treatment on the surface of the elastomer 3 by adopting 100# silicon carbide, carrying out sand blasting treatment on the surface of the elastomer 3, cutting the metal foil layer 1 into square blocks with the size of about 110mm by using a constantan alloy material and the thickness of 3-5 mu m of the metal foil layer 1, carrying out corresponding vacuum heat treatment at the heating temperature of 350-500 ℃ and the vacuum degree of less than or equal to 10 -3 Torr for 2-4 hours, removing an oxide layer generated on the surface of the metal foil layer 1 after the heat treatment is finished, adopting AL 2O3 with the mesh of 6000-8000 meshes to be mixed with pure water to form a mixed solution, carrying out AL 2O3 and pure water in the volume ratio of 1:2, and then wiping the surface of the metal foil layer 1 with the mixed solution to be bright, so that the oxide layer on the surface is removed, and finally cutting the metal foil layer 1 after the heat treatment into corresponding dimensions to be manufactured.
Coating two sides of an elastomer 3 with an insulator layer 21, coating one side of the insulator layer 21, which is away from the elastomer 3, with an adhesive sub-layer 22, adhering two metal foil layers 1 to the adhesive sub-layer 22, curing, processing one side of the metal foil layers 1, which is away from the adhesive sub-layer 22, to form a sensitive grid 11, and adjusting the resistance value of the sensitive grid 11;
An epoxy adhesive is scraped on the outer side of a sand blasting surface of an elastomer 3 to form an insulator layer 21, the thickness of the insulator layer 21 is 3 mu m, the insulator layer 21 is aired, the area of the insulator layer 21 is larger than that of the metal foil layer 1, a thin adhesive is brushed on the surface of the aired insulator layer 21 to form an adhesive sub-layer 22, the metal foil layer 1 is covered on the adhesive sub-layer 22, air bubbles in the adhesive sub-layer 22 and the metal foil layer 1 are extruded, after the process of first curing is finished, a silicon rubber plate is covered on the metal foil layer 1, a polytetrafluoroethylene film is padded between the silicon rubber plate and the metal foil layer 1, the area of the polytetrafluoroethylene film is larger than that of the metal foil layer 1 and the silicon rubber plate, a stainless steel plate is covered on the silicon rubber plate, a pressure of 3MPa is applied on a stainless steel backing plate, the temperature is kept at 125 ℃, after the first curing is finished, the connection between the elastomer 3 and the metal foil layer is guaranteed, and after the first curing is finished, the first curing is carried out, and the process of second curing is carried out at 186 ℃ when the temperature is kept at the temperature of 3 ℃ and the temperature is smaller than 2 ℃. After solidification, forming a sensitive grid 11 on the metal foil layer 1 by laser processing through laser equipment, turning over the elastomer 3 after processing, processing a sensitive grid 31 on the metal foil layer 1 on the other side, and adjusting the resistance value of the sensitive grid 11 to a required value through a mechanical resistance adjustment or chemical resistance adjustment method according to different requirements after processing.
Coating the surface of the sensitive grid 11 to form a protective layer;
The surface of the sensitive grating 11 is coated with a protective layer which is made of materials such as silica gel, polyurethane and butadiene rubber, and the thickness of the protective layer is 1 mm-3 mm.
The two sensor grids 11 are connected by wires to form a wheatstone bridge to form the load cell 100.
The two sensitive grids 11 with qualified adjustment resistance are connected through wires, generally, through holes are formed in the metal foil layer 1, the adhesive layer 2 and the elastic body 3, the wires pass through the through holes, two ends of the wires are respectively connected with the two sensitive grids 11 and are connected with a circuit board, and a Wheatstone bridge is formed after connection is completed, so that the weighing sensor 100 is manufactured.
In the above embodiment of the present utility model, the number of layers of the whole weighing sensor 100 is reduced by directly processing the sensitive grating 11 on the two metal foil layers 1, when the weighing sensor 100 is used, deformation generated by the elastomer 3 is transferred to the sensitive grating 11 of the metal foil layer and is transferred only through one adhesive layer 2, but in the prior art, the transfer of the adhesive and the substrate is needed, and because the strain capacity of each layer is different, errors occur in the transfer process, so that larger errors occur in the measurement result, and the utility model only needs to transfer through one adhesive layer 2, so that the errors of the transfer are greatly reduced, thereby reducing the errors of the measurement result, and further improving the accuracy of the weighing sensor 100.
Further, after the manufacturing is completed, the symmetrical weighing sensor 100 is required to be corrected and tested, after the Wheatstone bridge is formed, zero point measurement of the weighing sensor 100 is performed, compensation is performed to reach a range of +/-1% F.S., then 150% F.S. to 200% F.S. load is applied to the weighing sensor 100, the process is repeated for 5 to 10 times, temperature zero point compensation is performed, and zero point temperature compensation at 20 ℃ -10 ℃ and 40 ℃ is performed on zero point temperature compensation equipment. The method comprises the steps of collecting zero data at the temperature, performing corresponding compensation according to a result, performing test and sensitivity compensation, applying rated load to the weighing sensor 100, measuring the sensitivity of the weighing sensor 100, compensating the sensitivity to a required standard range, performing coating protection on the surface of the weighing sensor 100 after the measurement is completed, wherein the thickness is 2mm to 5mm, the coated material adopts polymer materials such as silica gel, polyurethane and rubber, and aims to prevent the weighing sensor 100 from being affected by moisture and insulating, testing various performance indexes required by the design of the weighing sensor 100 on a standard force measuring machine after the coating is completed, detecting the appearance, various products and electrical performance indexes of the weighing sensor 100, judging whether the standards are met, judging the grade, and packaging the manufactured weighing sensor 100 after the test is completed.
The foregoing description is only exemplary embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the present utility model.
Claims (10)
1. A weighing sensor, which comprises a body and a plurality of sensors, characterized by comprising the following steps:
the metal foil layer is provided with sensitive grids, and the number of the metal foil layers is two;
The number of the bonding layers is two;
And the two metal foil layers are respectively connected with one sides of the two bonding layers, which deviate from the elastic body, and the two sensitive grids are connected through wires.
2. The load cell of claim 1, wherein the adhesive layer comprises an insulator layer and an adhesive sub-layer that are connected to each other, wherein a side of the insulator layer facing away from the adhesive sub-layer is connected to the elastomer, and wherein a side of the adhesive sub-layer facing away from the insulator layer is connected to a side of the metal foil layer facing away from the sensitive grid.
3. The load cell of claim 1, wherein the metal foil layer is a constantan alloy layer.
4. The load cell of claim 1, wherein the metal foil layer has a thickness in the range of 3 μm to 5 μm.
5. The load cell of claim 1, wherein the surface of the elastomer is formed with a frosted surface.
6. The load cell of claim 2, wherein the area of the insulator layer is greater than the area of the metal foil layer.
7. The load cell of claim 2, wherein the metal foil layer has a size that is 2 to 3 times the size of the sensor grid.
8. The load cell of claim 1, wherein the surfaces of the pickoff grids are each coated with a protective layer.
9. The load cell of claim 8, wherein the protective layer has a thickness in the range of 1mm to 3mm.
10. The load cell of claim 1, wherein the adhesive layer has a thickness in the range of 1mm to 3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421110661.5U CN222318180U (en) | 2024-05-21 | 2024-05-21 | Load Cells |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202421110661.5U CN222318180U (en) | 2024-05-21 | 2024-05-21 | Load Cells |
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