Weighing device and weighing method

Abstract

The present invention provides a weighing sensor and an electronic balance. The weighing sensor includes: a bearing part; a fixing part, including a fixing part body and an extension part extending from the fixing part body towards the bearing part; a parallel guiding part respectively connecting the bearing part and the fixing part body; the bearing part, the fixing part body and the parallel guiding part form an accommodating space; the extension part of the fixing part is arranged in the accommodating space; a lever is arranged in the space between the extension part of the fixing part and the parallel guiding part; a reed structure includes a connecting reed connecting the bearing part and the lever to be used as a force transmission of the lever, and a fulcrum reed connecting the extension part of the fixing part and the lever to be used as a fulcrum of the lever; the bearing part, the fixing part, the parallel guiding part and the lever are of an integral structure. Through the weighing sensor and the electronic balance of the present invention, the weighing accuracy can be improved and the production cost can be reduced.

Description

Technical Field

[0001] The present invention belongs to the field of weighing technology, and particularly relates to a weighing device and a weighing method. Background Art

[0002] The electromagnetic force compensation type weighing sensor is a kind of weighing sensor often used in electronic balances at present. It has relatively mature technology and can achieve high precision and large measurement range. With the increasing application requirements for the accuracy and volume of electronic balances, further new requirements for weighing sensors are also put forward, such as small volume, high precision, low cost, large measurement range, and simple assembly.

[0003] Early weighing sensors were usually assembled from a large number of mechanical parts such as die-cast parts. Due to their large volume, numerous parts, complex assembly, large assembly tolerances, and unstable quality, they were restricted by technological development.

[0004] For semi-integrated weighing sensors, since the flexible hinge part and the lever structure of the main core components are still independently assembled, compared with the aforementioned early weighing sensors, although part of the installation process is simplified, the assembly tolerances of the components still affect the product performance. Even due to unreasonable structural settings, such as the lever being easily affected by external forces due to its installation position, the measurement results of the weighing sensor are affected.

[0005] For highly integrated weighing sensors, their main structural components, such as the bearing part, lever, fixing part, parallel guiding part, etc., are separated by very narrow wire-cutting grooves or numerically controlled machine tool processing grooves, and the gaps between the components are very small. Although this type of weighing sensor solves the problem that the installation tolerances of the aforementioned early old-fashioned weighing sensors and semi-integrated weighing sensors affect the measurement performance, due to the complex processing technology, the processing cost is high and the scrap rate is also relatively high. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a weighing sensor and an electronic balance that can overcome the influence of installation tolerances, while having a simple processing technology and low production cost.

[0007] The present invention solves the above technical problems through the following technical solutions:

[0008] A weighing sensor, characterized by comprising:

[0009] A bearing part;

[0010] A fixing part, including a fixing part body and extending parts extending from the fixing part body towards the bearing part;

[0011] Parallel guiding parts, respectively connected to the bearing part and the main body of the fixing part; the bearing part, the main body of the fixing part and the parallel guiding parts form an accommodating space; the extending part of the fixing part is arranged in the accommodating space;

[0012] A lever, arranged in the space between the extending part of the fixing part and the parallel guiding part;

[0013] A reed structure, including a connecting reed that connects the bearing part and the lever for force transmission of the lever, and a fulcrum reed that connects the extending part of the fixing part and the lever for use as a fulcrum of the lever;

[0014] The bearing part, the fixing part, the parallel guiding parts, the lever and the reed structure are of an integral structure.

[0015] According to an embodiment of the present invention, the parallel guiding parts include an upper parallel guiding piece and a lower parallel guiding piece. The upper parallel guiding piece and the lower parallel guiding piece are respectively connected to the base of the bearing part and the upper end and the lower end of the main body of the fixing part. The connection parts of the parallel guiding pieces with the fixing part and the bearing part are arranged as thin sheets.

[0016] According to an embodiment of the present invention, the front end surfaces of the extending part of the fixing part respectively extend forward to form a first supporting part and a second supporting part. An inner concave structure is formed between the first supporting part, the second supporting part and the extending part;

[0017] The fulcrum reed includes a first fulcrum reed and a second fulcrum reed; the first fulcrum reed and the second fulcrum reed are respectively connected to the first supporting part and the second supporting part.

[0018] According to an embodiment of the present invention, the lever includes:

[0019] A reed connection part, arranged at the front end of the lever, including a first fulcrum connection part connected to the first fulcrum reed, a second fulcrum connection part connected to the second fulcrum reed, and a connection reed connection part connected to the connection reed;

[0020] A counterweight extension part, arranged on the lower end surface of the reed connection part and vertically extending downward into the inner concave structure;

[0021] A magnetic system connection part, arranged at the tail end of the lever and connected to the magnetic system structure of the weighing sensor.

[0022] According to an embodiment of the present invention, the counterweight extension part is integrally processed.

[0023] According to an embodiment of the present invention, the bearing part faces the base of the lever and extends forward to form an attachment;

[0024] The attachment and the lever are connected by the connecting reed, and the cross-sectional area of the attachment is smaller than the cross-sectional area of the base of the bearing part.

[0025] According to an embodiment of the present invention, a through space is formed longitudinally in the fixing part body.

[0026] According to an embodiment of the present invention, the upper end surface of the fixing part body includes a laterally extending groove, and a magnetic system mounting part is formed by extending from the fixing part body relative to the extending part.

[0027] According to an embodiment of the present invention, the parallel guiding part and the lever are detachably connected by a temporary connecting piece;

[0028] The extending part and the lever are detachably connected by a temporary connecting piece.

[0029] The present invention also provides an electronic balance, which is characterized in that it includes the weighing sensor as described above.

[0030] The positive and progressive effects of the present invention are as follows:

[0031] For the weighing sensor and the electronic balance provided by the present invention, since the bearing part, the fixing part, the parallel guiding part, the lever and the reed structure of the weighing sensor are all machined into an integral structure, the defects of complex processing technology, large volume, high cost and cumbersome assembly in the prior art are overcome. The provided weighing sensor simplifies the processing technology and the assembly process and avoids installation tolerances. At the same time, a receiving space is integrally formed by the bearing part, the parallel guiding part and the fixing part of the weighing sensor, and the lever is placed in the space jointly formed by the receiving space and the extending part extending forward from the fixing part. Due to the improved rationality of the internal structure design of the weighing sensor, during the actual weighing process, the weighing sensor can avoid the influence of external collisions. For example, when grasping, the cable may be easily broken, or after an external force touches the lever, the reed connected to the lever may be bent and deformed, etc., ensuring the weighing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other features, properties and advantages of the present invention will become more obvious through the following description with reference to the drawings and embodiments, in which the same reference numerals always represent the same features, where:

[0033] Figure 1 is a perspective view of an embodiment of the weighing sensor of the present invention;

[0034] Figure 2 isFigure 1 Another perspective three-dimensional view of the embodiment;

[0035] Figure 3 is Figure 1 Cross-sectional view of the embodiment;

[0036] Figure 4 is Figure 1 Top view of the embodiment;

[0037] Figure 5 is Figure 1 Three-dimensional view of the embodiment after adding the lever structure;

[0038] Figure 6 is Figure 5 Another perspective three-dimensional view of the embodiment;

[0039] Figure 7 is Figure 6 Front view of the embodiment;

[0040] Figure 8 is Figure 6 Schematic diagram of the structure connection part of the lever structure magnetic system in the embodiment.

[0041]

Reference Signs

[0042] Load cell 1

[0043] Carrying part 11

[0044] Base part of the carrying part 111

[0045] Carrying part attachment 112

[0046] Fixing part 12

[0047] Fixing part body 121

[0048] Extension part of the fixing part 122

[0049] Magnetic system mounting part of the fixing part 123

[0050] First support part of the fixing part 1221

[0051] Penetrating space 1233

[0052] Parallel guiding part 13

[0053] Upper parallel guiding piece 131

[0054] Lower parallel guiding piece 132

[0055] Lever 14

[0056] Reed connection part 141

[0057] Reed connection body part 1411

[0058] First fulcrum connection part 1412

[0059] Second fulcrum connection part 1413

[0060] Connection reed connection part 1414

[0061] Counterweight extension part 1415

[0062] Magnetic system structure connection part 142

[0063] Connection reed 15

[0064] First fulcrum reed 161

[0065] Second fulcrum reed 162 Detailed implementation mode

[0066] To make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation mode of the present invention is provided in conjunction with the accompanying drawings.

[0067] The weighing sensor adopted in the embodiment of the present invention can be applied to various types of electronic balances. In terms of structure, it is more compact than the existing weighing sensors, reducing the production and processing costs, improving the assembly efficiency, and optimizing the performance.

[0068] As Figures 1 to 8 shown, the weighing sensor 1 of this embodiment includes: a bearing part 11, a fixing part 12, a parallel guiding part 13, a lever 14, and a reed structure. Among them, the bearing part 11, the fixing part 12, the parallel guiding part 13, the lever 14 and the reed structure are an integral structure, that is, formed integrally from a whole piece of material. The integral structure can be an integrally formed structure by die-casting, or a machined integrally formed structure, or an integrally formed structure obtained by die-casting combined with machining, which simplifies the structure of the weighing sensor 1 and also facilitates processing and assembly.

[0069] The parallel guiding part 13 includes an upper parallel guiding piece 131 in an H shape (the upper parallel guiding piece 131 can also have different widths at both ends, such as a trapezoidal structure) and a lower parallel guiding piece 132. The upper parallel guiding piece 131 and the lower parallel guiding piece 132 are respectively connected to the base 111 of the bearing part 11 and the upper and lower ends of the fixing part body 121 of the fixing part 12, so that a receiving space similar to a cuboid shape, or other spatial shapes with the same length of both end sides, is formed by the bearing part 11, the upper and lower parallel guiding pieces 131, 132 and the fixing part body 121. When a load is applied to the bearing part 11, the parallel guiding part 13 will have a small displacement in the vertical direction.

[0070] At the connection parts of the upper and lower parallel guiding pieces 131, 132 of the parallel guiding part 13 with the bearing part 11 and the fixing part 12, with respect to the upper and lower parallel guiding pieces 131, 132 as the connection ends, the bearing part 11 and the fixing part 12 are thin slices with gradually decreasing thickness.

[0071] The cross-sectional lengths of the ends where the upper parallel guiding piece 131 is respectively connected to both ends of the bearing part 11 and the fixing part 12 are the same. For example, the upper parallel guiding piece 131 forms a shape similar to a rectangle between the bearing part 11 and the fixing part 12, or other shapes with the same lengths of the sides at both ends.

[0072] When the cross-sectional lengths of the ends where the upper parallel guiding piece 131 is respectively connected to both ends of the bearing part 11 and the fixing part 12 are different, in the direction from the end connected to the bearing part 11 to the end connected to the fixing part 12, the distance between the two sides of the upper parallel guiding piece 131 gradually changes from the cross-sectional length of the end connected to the bearing part to the cross-sectional length of the end connected to the fixing part.

[0073] The fixing part 12 includes a fixing part body 121 and an extension part 122 extending from the fixing part body 121 towards the base part 111 of the bearing part 11. Therefore, the extension part 122 of the fixing part 12 is arranged in the accommodation space formed by the bearing part 11, the upper and lower parallel guiding pieces 131, 132 and the fixing part body 121, and the extension part 122 of the fixing part 12 is located between the upper parallel guiding piece 131 and the lower parallel guiding piece 132, has a distance from both the upper parallel guiding piece 131 and the lower parallel guiding piece 132 and extends to the bearing part 11, and there is a gap between it and the bearing part 11. The extension part 122 divides the accommodation space into upper and lower two spaces, or at least a space is reserved between the extension part 122 and the upper parallel guiding piece 131. A gap is formed between the extension part 122 and the bearing part 11 for arranging components such as the connecting spring piece 15.

[0074] The extension part 122 of the fixing part 12 divides the parallel guiding part 13 into two different spaces. The distance between the upper parallel guiding piece 131 and the extension part 122 in the space formed by the combination of the upper parallel guiding piece 131 and the extension part 122 is large enough, so that the lever 14 can be placed in the space formed by the combination of the fixing part body 121, the upper parallel guiding piece 131 and the extension part 122. Therefore, the weighing sensor 1 has a compact structure, high strength and stiffness of the supporting part, a small volume, is easy to process and install, and has good performance.

[0075] The reed structure includes a connecting reed 15 that connects the bearing part 11 and the lever 14 together for force transmission of the lever 14, and a fulcrum reed that connects the extension 122 of the fixing part 12 and the lever 14 together for use as a support point of the lever 14.

[0076] At both ends of the front end face of the extension 122 of the fixing part 12, a first support part 1221 and a second support part (not shown in the figure) are respectively formed by extending forward. The first support part 1221 and the second support part are distributed on both sides of the front end face of the extension 122, forming a concave accommodation space a. The concave surface of the accommodation space a can be a curved surface or composed of continuous planes.

[0077] The fixing part 12 includes a fixing part body 121. The upper end face of the fixing part body 121 includes a first groove 1211 extending horizontally, and the lower end face of the fixing part body includes a second groove 1212 extending horizontally; a magnetic system mounting part 123 formed by extending forward from the fixing part body 121; a longitudinal through space 1233 is formed longitudinally in the fixing part body 121, so as to be suitable for the tail end of the lever 14 connected to the magnetic system to rotate, and to facilitate the convenience in component processing.

[0078] The fulcrum reed includes a first fulcrum reed 161 and a second fulcrum reed 162; the first fulcrum reed 161 and the second fulcrum reed 162 are respectively connected to the first support part 1221 and the second support part. The first fulcrum reed 161 and the second fulcrum reed 162 are symmetrically arranged with respect to the connecting reed 15. The connecting reed 15 and the fulcrum reeds 161, 162 are of an integral structure with the fixing part 12, the parallel guiding part 13, the bearing part 11, and the lever 14, or can be separately manufactured and then connected to the bearing part 11, the lever 14, and the fixing part 12 by a fixed connection method. The positions of the thin sheets are pre-machined during the manufacturing process. This structure reduces the number of parts, saves costs and assembly time.

[0079] The bearing part 11 includes a base 111 of the bearing part 11, and a bearing part add-on 112 formed by extending forward from the base 111. The cross-sectional area of the bearing part add-on 112 is smaller than the cross-sectional area of the main body part of the bearing part. The bearing part add-on 112 and the lever 14 are connected by a connecting reed 15. The first fulcrum reed 161 and the second fulcrum reed 162 are distributed on both sides of the connecting reed 15.

[0080] The lever 14 is located in the space formed by the combination of the fixed part body 121, the upper parallel guide piece 131, and the extension part 122. The lever 14 includes a reed connection part 141 connected to the connection reed 15, the first fulcrum reed 161, and the second fulcrum reed 162, and a magnetic system structure connection part 142 connected to the magnetic system structure.

[0081] The lever 14 includes a reed connection part 141 connected to the connection reed 15, the first fulcrum reed 161, and the second fulcrum reed 162, and a magnetic system structure connection part 142 connected to the magnetic system structure. The reed connection part 141 and the bearing part 11, the fixed part 12, and the parallel guide part 13 are of an integrally formed structure. The reed connection part 141 includes a reed connection body part 1411, a first fulcrum connection part 1412, a second fulcrum connection part 1413, a connection reed connection part 1414, and a counterweight extension part 1415 extending downward from the lower end of the reed connection part on the lever. The counterweight extension part 1415 is partially placed in the accommodation space a formed between the fixed part extension part 122, the fixed part first support part 1221, and the fixed part second support part. The lever magnetic system structure connection part 142 and the lever magnetic system reed connection part 141 are connected by a fixed connection method. This structure has a lower processing cost, is more compact, and is easier to install.

[0082] The function of the counterweight extension part 1415 is to adjust the counterweight of the weighing lever 14 and the moment of inertia of the lever 14, so as to optimize the dynamic weighing effect of the load cell. The counterweight extension part 1415 is integrally processed, and its size can be determined according to design requirements and adjusted without assembly. Integral processing makes the load cell more consistent, and batch adjustment can be achieved through processing parameters.

[0083] During the manufacturing process, a thin sheet 18 can be processed in advance at the connection between the upper parallel guide piece 131 and the lever 14. Similarly, it can avoid the influence of accidental vibrations, etc. on the load cell. At the same time, when the connection between the upper parallel guide piece 131 and the lever 14 is not required, the thin sheet can be cut to cut off the connection between the upper parallel guide piece 131 and the lever 14, and this method can also utilize the cutting action of the thin sheet 18 to adjust the stress in the entire load cell.

[0084] As a variant of this embodiment, the upper parallel guide piece 131 and the lever 14 can be detachably connected through a temporary connection piece 18. The upper parallel guide piece 131 and the lever 14 are fixed by the temporary fixing connection component 18, that is, the upper parallel guide piece 131 and the lever 14 are fixed as a whole, so as to avoid the influence of accidental vibrations, especially the accidental vibrations during transportation, on the load cell 1.

[0085] During the manufacturing process of this embodiment, a thin sheet 19 is pre-processed at the connection between the fixing part extension 122 and the lever 14, which can also avoid the influence of accidental vibrations and the like on the weighing sensor. At the same time, when the connection between the fixing part extension 123 and the lever 14 is not required, the thin sheet 19 can be cut to cut off the connection between the fixing part extension and the lever, and this method can also utilize the cutting action of the thin sheet 19 to adjust the stress in the entire weighing sensor.

[0086] In a variant of this embodiment, the fixing part extension 122 and the lever 14 can be detachably connected through a temporary connecting piece 19. The fixing part extension 122 and the lever 14 are fixed by the temporary fixing connection component 19, that is, the fixing part extension 122 and the lever 14 are fixed as a whole, so as to avoid the influence of accidental vibrations and the like, especially accidental vibrations during transportation, on the weighing sensor.

[0087] The lever 14 can be an integral lever structure, that is, the reed connecting part 141 and the magnetic system structure connecting part 142 on the lever 14 are integrally processed and formed structures. The lever 14 adopts a cross-shaped structure, making the lever structure more compact and reducing the number of parts to be assembled. The specific shape of the lever 14 can be arbitrarily adjusted according to the shape of the lever accommodation space of the actual weighing sensor, the shape of the opening of the lever accommodation space, and the size. As a variant, the lever 14 can also be a segmented structure, that is, the reed connecting part 141 and the magnetic system structure connecting part 142 are connected by a connecting piece.

[0088] The first fulcrum reed 161 and the second fulcrum reed 162 connect the first support part 1221 of the extension 122 of the fixing part 12, the second support part, the first fulcrum connecting part 1412 of the reed connection of the lever 14, and the second fulcrum connecting part 1413 of the reed connection of the lever 14 together to be used as the support points of the lever 14.

[0089] In actual use, after a load is applied to the bearing part 11, the connecting reed 15 transmits the force to the lever 14, and the lever 14 loses balance. After being amplified by the long arm of the lever 14, the photoelectric detection slit (not shown) at the tail end of the lever 14 deviates from the original balanced position. The photoelectric displacement sensor (not shown) detects that the light flux passing through the photoelectric detection slit on the lever 14 changes, and feeds back to the circuit device of the weighing sensor 1 to prompt it to generate a corresponding compensation current. This current flows through a coil (not shown) located at the long arm end of the lever, and the coil generates a compensation force (or called a balancing force) in a fixed magnetic field, so that the lever 14 returns to the balanced state again, that is, the detection slit of the lever 14 returns to the balanced position. The compensation current undergoes a series of data acquisitions and data processing through the circuit part of the electronic balance to obtain the actual weight of the applied load.

[0090] In this embodiment, the connecting parts between various components are machined by using the existing processing techniques and requirements of load cells into thin flakes that are thinner at both ends relative to the connecting ends of the connecting components, thereby enhancing the range of relative movement of each part. At the same time, the structure is more compact, the production and processing costs are reduced, the assembly efficiency is improved, and the performance is more optimized.

[0091] In a variant of this embodiment, the bearing part 11, the fixing part 12, the parallel guiding parts 131, 132 connecting the bearing part 11 and the fixing part 12, the lever 14, the connecting reed 15, the first fulcrum reed 161, and the second fulcrum reed 162 can also be separate structures, and then assembled to form the load cell 1.

[0092] Although the present invention has been described with reference to current specific embodiments, those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention, and various equivalent changes or substitutions can be made without departing from the spirit of the present invention. Therefore, as long as the changes and variations of the above embodiments are within the scope of the substantial spirit of the present invention, they will fall within the scope of the claims of this application.

Claims

1. A weighing sensor, characterized in that, Comprising: A bearing part; A fixing part, including a fixing part body and extension parts extending from the fixing part body towards the bearing part. The front end faces of the extension parts of the fixing part respectively extend forward to form a first supporting part and a second supporting part. An inner concave structure is formed among the first supporting part, the second supporting part and the extension parts; Parallel guiding parts, respectively connected to the bearing part and the fixing part body; the bearing part, the fixing part body and the parallel guiding parts form an accommodating space; the extension parts of the fixing part are arranged in the accommodating space; A lever, arranged in the space between the extension part of the fixing part and the parallel guiding parts; A reed structure, including a connecting reed for connecting the bearing part and the lever to be used as the force transmission of the lever, and a fulcrum reed for connecting the extension part of the fixing part and the lever to be used as the fulcrum of the lever; The bearing part, the fixing part, the parallel guiding parts, the lever and the reed structure are of an integral structure; The lever includes a reed connecting part and a counterweight extension part. The reed connecting part is arranged at the front end of the lever. The counterweight extension part is arranged on the lower end face of the reed connecting part and extends vertically downward into the inner concave structure; the counterweight extension part is integrally processed.

2. The weighing sensor according to claim 1, characterized in that, The parallel guiding parts include an upper parallel guiding piece and a lower parallel guiding piece. The upper parallel guiding piece and the lower parallel guiding piece are respectively connected to the base of the bearing part and the upper end and the lower end of the fixing part body. The connection parts of the parallel guiding pieces with the fixing part and the bearing part are arranged as thin sheets.

3. The weighing sensor according to claim 1, wherein, The fulcrum reed includes a first fulcrum reed and a second fulcrum reed; the first fulcrum reed and the second fulcrum reed are respectively connected to the first supporting part and the second supporting part.

4. The load cell according to claim 3, characterized in that, The reed connecting part includes a first fulcrum connecting part connected to the first fulcrum reed, a second fulcrum connecting part connected to the second fulcrum reed, and a connecting reed connecting part connected to the connecting reed; The lever further includes a magnetic system connecting part, arranged at the tail end of the lever and connected to the magnetic system structure of the weighing sensor; A through space is formed longitudinally in the fixing part body.

5. The weighing sensor according to claim 1, characterized in that, The base of the bearing part facing the lever extends forward to form an attachment; The attachment and the lever are connected by the connecting reed, and the cross-sectional area of the attachment is smaller than the cross-sectional area of the base of the bearing part.

6. The weighing sensor according to claim 1, wherein The upper end face of the fixing part body includes a laterally extending groove, and a magnetic system mounting part extends from the fixing part body relative to the extension part.

7. The weighing sensor according to claim 1, characterized in that The parallel guiding parts and the lever are detachably connected by a temporary connecting piece; The extension part and the lever are detachably connected by a temporary connecting piece.

8. An electronic balance, characterized in that, It includes a weighing sensor as described in any one of claims 1 to 7.

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