CN212158768U - Weighing sensor and electronic balance comprising same - Google Patents
Weighing sensor and electronic balance comprising same Download PDFInfo
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- CN212158768U CN212158768U CN202020703910.7U CN202020703910U CN212158768U CN 212158768 U CN212158768 U CN 212158768U CN 202020703910 U CN202020703910 U CN 202020703910U CN 212158768 U CN212158768 U CN 212158768U
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- lever
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- reed
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Abstract
The utility model provides a weighing sensor reaches electronic balance including it, wherein weighing sensor includes: a bearing part; the fixing part comprises a fixing part body and an extension part extending from the fixing part body to the bearing part; the parallel guide part is respectively connected with the bearing part and the fixing part body; the bearing part, the fixing part body and the parallel guide part form an accommodating space; the extension part of the fixing part is arranged in the accommodating space; a lever disposed in a space between the extension part of the fixing part and the parallel guide part; a spring structure including a connection spring connecting the bearing part and the lever together for force transmission of the lever, and a fulcrum spring connecting the fixing part extension and the lever together for a lever supporting point; the bearing part, the fixing part, the parallel guide part and the lever are of an integrated structure. Through the utility model discloses a weighing sensor reaches electronic balance including it can improve and weigh the accuracy to reduce production.
Description
Technical Field
The utility model belongs to the weight measuring technique especially relates to a weighing sensor and including its electronic balance.
Background
The electromagnetic force compensation type weighing sensor is a weighing sensor frequently used on the existing electronic balance, has a mature technology, and can realize high precision and large measuring range. With the increase of application requirements on the precision and the volume of the electronic balance and the like, further, new requirements such as small volume, high precision, low cost, large measuring range and simple assembly are also provided for the symmetrical retransmission sensor.
Early weighing sensors were usually assembled from a large number of mechanical parts such as die-cast parts, and were restricted by technical development due to their large size, numerous parts, complex assembly, large assembly tolerances, and unstable mass.
In the case of a semi-integrated load cell, since the flexible hinge portion and the lever structure of the main core member are still independently assembled, the product performance is affected by the assembly tolerance, although a part of the assembly process is simplified, compared to the earlier load cell. Even the structure is unreasonable, for example, the lever is susceptible to external force due to the arrangement position, thereby affecting the measurement result of the weighing sensor.
For the highly integrated weighing sensor, the main structural components, such as the bearing part, the lever, the fixing part, the parallel guide part and the like, are divided by a narrow wire cutting groove or a numerical control machine tool machining groove, and the gap between the components is very small. Although the weighing sensor of the type solves the problem that the mounting tolerance of the early old weighing sensor and the semi-integrated weighing sensor influences the measurement performance, the processing cost is high and the rejection rate is high due to the complex processing technology.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a can overcome installation tolerance influence, simultaneous processing simple process, low in production cost's weighing sensor reaches electronic balance including it.
The utility model discloses a solve above-mentioned technical problem through following technical scheme:
a load cell, comprising: a bearing part;
the fixing part comprises a fixing part body and an extension part extending from the fixing part body to the bearing part;
the parallel guide part is respectively connected with the bearing part and the fixing part body; the bearing part, the fixing part body and the parallel guide part form an accommodating space; the extension part of the fixing part is arranged in the accommodating space;
a lever disposed in a space between the extension part of the fixing part and the parallel guide part;
a spring structure including a connection spring connecting the bearing part and the lever together for force transmission of the lever, and a fulcrum spring connecting the fixing part extension and the lever together for the lever supporting point;
the bearing part, the fixing part, the parallel guide part, the lever and the reed structure are of an integrated structure.
According to the utility model discloses an embodiment, parallel direction portion includes parallel direction piece and parallel direction piece down, go up parallel direction piece with parallel direction piece down connect respectively in the basal portion of bearing part and the upper end and the lower extreme of fixed part body parallel direction piece with the fixed part with the junction of bearing part sets up to the thin slice.
According to an embodiment of the present invention, the front end surface of the extending portion of the fixing portion respectively extends forward to form a first supporting portion and a second supporting portion, and an indent structure is formed between the first supporting portion, the second supporting portion and the extending portion;
the fulcrum reed comprises 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.
According to an embodiment of the invention, the lever comprises:
the reed connecting part is arranged at the front end of the lever and comprises a first fulcrum connecting part connected with the first fulcrum reed, a second fulcrum connecting part connected with the second fulcrum reed and a connecting reed connecting part connected with the connecting reed;
the counterweight extension part is arranged on the lower end surface of the reed connecting part and vertically extends downwards to be arranged in the concave structure;
and the magnetic system connecting part is arranged at the tail end of the lever and is connected to the magnetic system structure of the weighing sensor.
According to an embodiment of the present invention, the weight extension is integrally formed.
According to an embodiment of the present invention, the bearing portion faces the base portion of the lever, and extends forward to form an attachment;
the attachment piece and the lever are connected by the connecting spring, and the cross-sectional area of the attachment piece is smaller than the cross-sectional area of the base of the bearing part.
According to the utility model discloses an embodiment, the fixed part body vertically forms a through space.
According to the utility model discloses an embodiment, fixed part body up end includes a horizontal extension's recess, and certainly the fixed part body is relative the extension extends and forms the magnetic system installation department.
According to an embodiment of the present invention, the parallel guide portion and the lever are detachably connected by a temporary connection piece;
the extension portion and the lever are detachably connected through a temporary connecting piece.
The utility model also provides an electronic balance, its characterized in that, it includes as above weighing sensor.
The utility model discloses an actively advance the effect and lie in:
the utility model provides a weighing sensor reaches electronic balance including it, because weighing sensor's supporting part, fixed part, parallel guide portion, lever and reed structure are machining integral type structure, consequently overcome among the prior art weighing sensor's processing technology complicacy, bulky, with high costs, assemble loaded down with trivial details defect, the weighing sensor who provides has realized the simplification of processing technology and assembly process, has avoided installation tolerance. Simultaneously, by weighing sensor's the portion of bearing, parallel guide part and fixed part form the accommodation space for integrated into one piece, arrange the lever in the common space that constitutes of extension that this accommodation space and fixed part extend forward, owing to improved weighing sensor inner structure design's rationality, at the actual in-process of weighing, weighing sensor can avoid coming from outside collision influence, for example easily bump the cable line when snatching apart, perhaps after external force touchs the lever, make the reed bending deformation who connects in the lever etc. guaranteed to weigh the accuracy.
Drawings
The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which like reference numerals refer to like features throughout, and in which:
fig. 1 is a perspective view of an embodiment of the load cell of the present invention;
FIG. 2 is another angular perspective view of the embodiment of FIG. 1;
FIG. 3 is a cross-sectional view of the embodiment of FIG. 1;
FIG. 4 is a top view of the embodiment of FIG. 1;
FIG. 5 is a perspective view of the embodiment of FIG. 1 with the lever structure added;
FIG. 6 is another angular perspective view of the embodiment of FIG. 5;
FIG. 7 is a front view of the embodiment of FIG. 6;
FIG. 8 is a schematic structural diagram of a structural connection portion of the lever structure magnetic system in the embodiment of FIG. 6.
[ reference numerals ]
Bearing part 11
Fixed part 12
Fixing part body 121
Magnetic system mounting part 123 of fixing part
Fixed part first support 1221
Penetrating space 1233
Parallel guide part 13
Upper parallel guide piece 131
Lower parallel guide plate 132
Lever 14
Reed connecting part 141
Reed connecting body part 1411
Second fulcrum connection portion 1413
Connecting reed connecting part 1414
Magnetic system structure connecting part 142
Connecting spring 15
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The embodiment of the utility model provides an in the weighing sensor who adopts can be applied to various types of electronic balance, structurally for compacter in current weighing sensor, reduced the cost of production and processing, improved the packaging efficiency, the performance is optimized more.
As shown in fig. 1 to 8, a load cell 1 of the present embodiment includes: a bearing part 11, a fixing part 12, a parallel guide part 13, a lever 14, and a reed structure. The bearing part 11, the fixing part 12, the parallel guide part 13, the lever 14 and the reed structure are of an integrated structure, that is, are formed by integrally molding a whole material. The integral type structure can be die-casting forming's integral type structure, also can be machine-tooled forming's integral type structure, perhaps die-casting cooperation machine-tooled forming obtains the integral type structure, when making weighing sensor 1 simple structure, has also made things convenient for the processing equipment.
The parallel guide portion 13 includes an upper parallel guide piece 131 having an H-shape (the upper parallel guide piece 131 may have a width different from that of the two ends, such as a trapezoid structure), and a lower parallel guide piece 132. The upper parallel guide piece 131 and the lower parallel guide piece 132 are respectively connected to the base 111 of the carrying part 11 and the upper end and the lower end of the fixing part body 121 of the fixing part 12, so that the carrying part 11, the upper and lower parallel guide pieces 131, 132 and the fixing part body 121 form a containing space similar to a rectangular parallelepiped shape or other space shapes with the same length of both ends. When a load is applied to the bearing part 11, the parallel guide part 13 is slightly displaced in the vertical direction.
The joints of the upper and lower parallel guide pieces 131, 132 of the parallel guide portion 13 with the carrier portion 11 and the fixing portion 12 are thin sheets gradually thinner than the joints of the upper and lower parallel guide pieces 131, 132, the carrier portion 11 and the fixing portion 12.
The upper parallel guide pieces 131 have the same sectional length as the end portions connecting both ends of the carrier part 11 and the fixing part 12, respectively. For example, the upper parallel guide piece 131 is formed in a rectangular-like shape between the carrier part 11 and the fixing part 12, or other shapes having the same length of sides at both ends.
When the upper parallel guide piece 131 has different sectional lengths at the ends connecting both ends of the carrier part 11 and the fixing part 12, respectively, the distance between both sides of the upper parallel guide piece 131 gradually changes from the sectional length at the end connecting the carrier part to the sectional length at the end connecting the fixing part in the direction from the end connecting the carrier part 11 to the end connecting the fixing part 12.
The fixing portion 12 includes a fixing portion body 121 and an extending portion 122 extending from the fixing portion body 121 to the base 111 of the bearing portion 11, so that the extending portion 122 of the fixing portion 12 is disposed in the accommodating space formed by the bearing portion 11, the upper and lower parallel guide pieces 131, 132 and the fixing portion body 121, and the extending portion 122 of the fixing portion 12 is located between the upper parallel guide piece 131 and the lower parallel guide piece 132, and has a distance from both the upper parallel guide piece 131 and the lower parallel guide piece 132 to extend to the bearing portion 11, and a gap is left between the upper parallel guide piece 131 and the bearing portion 11. The extension part 122 divides the receiving space into upper and lower spaces, or at least a space is reserved between the extension part 122 and the upper parallel guide piece 131. A gap is formed between the extension part 122 and the bearing part 11 for arranging components such as a connection spring 15.
The extending portion 122 of the fixing part 12 divides the parallel guide part 13 into two different spaces, wherein the distance between the upper parallel guide piece 131 and the extending portion 122 in the space formed by the combination of the upper parallel guide piece 131 and the extending portion 122 is sufficiently large so that the lever 14 can be placed in the space formed by the combination of the fixing part body 121, the upper parallel guide piece 131, and the extending portion 122. Therefore, the weighing sensor 1 has compact structure, high strength and rigidity of the supporting part, small volume, easy processing and installation and good performance.
The spring structure includes a connection spring 15 connecting the bearing part 11 and the lever 14 together to serve as a force transmission of the lever 14, and a fulcrum spring connecting the extension part 122 of the fixing part 12 and the lever 14 together to serve as a supporting point of the lever 14.
A first supporting portion 1221 and a second supporting portion (not shown in the figure) formed by extending forward from two ends of the front end surface of the extending portion 122 of the fixing portion 12. The first supporting portion 1221 and the second supporting portion are distributed on two sides of the front end surface of the extending portion 122 to form a concave accommodating space a. The concave surface of the accommodating space a can be a curved surface or a continuous plane.
The fixing portion 12 includes a fixing portion body 121, an upper end surface of the fixing portion body 121 includes a first groove 1211 extending in a transverse direction, and a lower end surface of the fixing portion body includes a second groove 1212 extending in the transverse direction; a magnetic system mounting part 123 formed extending forward from the fixing part body 121; the fixing portion body 121 is formed with a longitudinally penetrating through space 1233 in a longitudinal direction so as to be adapted to the rotation of the lever 14 in connection with the trailing end of the magnetic system and to facilitate convenience in assembly process.
The fulcrum reed comprises a first fulcrum reed 161 and a second fulcrum reed 162; the first fulcrum spring 161 and the second fulcrum spring 162 are connected to the first support 1221 and the second support, respectively. The first fulcrum spring 161 and the second fulcrum spring 162 are symmetrically arranged with the connection spring 15. The connecting spring 15, the fulcrum springs 161 and 162, the fixing portion 12, the parallel guide portion 13, the bearing portion 11 and the lever 14 are of an integral structure, or can be separately manufactured and then connected to the bearing portion 11, the lever 14 and the fixing portion 12 in a fixed connection mode. The location of the wafer is pre-machined during the manufacturing process, which reduces the number of parts and saves cost and assembly time.
The carrying part 11 includes a base part 111 of the carrying part 11, and a carrying part attachment 112 formed to extend forward from the base part 111. The cross-sectional area of the carrier attachment 112 is smaller than the cross-sectional area of the carrier body portion. The carrier attachment 112 and the lever 14 are connected by a connecting spring 15. The first fulcrum spring 161 and the second fulcrum spring 162 are distributed on two sides of the connecting spring 15.
The lever 14 is located in a space formed by the combination of the fixing portion body 121, the upper parallel guide piece 131, and the extension portion 122. The lever 14 includes a reed connection part 141 connected to the connection reed 15 and the first and second fulcrum reeds 161 and 162, and a magnetic system structure connection part 142 connected to the magnetic system structure.
The lever 14 includes a reed connection part 141 connected to the connection reed 15 and the first and second fulcrum reeds 161 and 162, and a magnetic system structure connection part 142 connected to the magnetic system structure. The reed connecting part 141, the bearing part 11, the fixing part 12 and the parallel guide part 13 are integrally formed. The reed connecting portion 141 includes a reed connecting body portion 1411, a first fulcrum connecting portion 1412, a second fulcrum connecting portion 1413 and a connecting reed connecting portion 1414 and a weight extending portion 1415 formed to extend downward from the lower end of the reed connecting portion on the lever, the weight extending portion 1415 being partially disposed in the accommodating space a formed between the fixing portion extending portion 122, the fixing portion first supporting portion 1221 and the fixing portion second supporting portion. The lever magnetic system structure connecting part 142 and the lever magnetic system reed connecting part 141 are connected in a fixed connection manner. The structure has the advantages of lower processing cost, compact structure and easier installation.
The purpose of the weight extension 1415 is to adjust the weight of the weighing lever 14, as well as the moment of inertia of the lever 14, to optimize the dynamic weighing effect of the load cell. The weight extension 1415 is integrally machined and sized as required by design and adjusted when not required for assembly. The uniformity of the weighing sensor is better by integrated processing, and batch adjustment can be realized through processing parameters.
In the manufacturing process, the sheet 18 can be processed at the joint of the upper parallel guide piece 131 and the lever 14 in advance, so that the influence of a symmetrical sensor such as accidental vibration can be avoided, meanwhile, when the connection of the upper parallel guide piece 131 and the lever 14 is not needed, the sheet can be cut off to cut off the connection of the upper parallel guide piece 131 and the lever 14, and in this way, the stress in the whole weighing sensor can be adjusted by utilizing the cutting action of the sheet 18.
As a modification of this embodiment, the upper parallel guide piece 131 and the lever 14 may be detachably connected by a temporary connecting piece 18. The upper parallel guide piece 131 and the lever 14 are fixed by a temporary fixing connection part 18, that is, the upper parallel guide piece 131 and the lever 14 are fixed integrally, so that the influence of the sensor 1 due to unexpected vibration and the like, especially unexpected vibration during transportation, can be avoided.
In this embodiment, the sheet 19 is formed at the joint between the fixing portion extension 122 and the lever 14 in advance during the manufacturing process, so that the influence of the sensor can be avoided, such as accidental vibration, and the sheet 19 can be cut to cut the joint between the fixing portion extension and the lever when the joint between the fixing portion extension 123 and the lever 14 is not required, and this way, the stress in the whole weighing sensor can be adjusted by the cutting action of the sheet 19.
In a modification of this embodiment, the fixing portion extension 122 and the lever 14 may be detachably connected by a temporary connecting piece 19. The fixing part extension part 122 and the lever 14 are fixed by the temporary fixing connection part 19, that is, the fixing part extension part 122 and the lever 14 are fixed integrally, so that the influence of an accidental shock and the like, especially an accidental shock in transportation and a symmetrical weight sensor can be avoided.
The lever 14 may be an integrated lever structure, that is, the reed connecting part 141 and the magnetic system structure connecting part 142 of the lever 14 are integrally formed. The lever 14 adopts a cross-shaped structure, so that the lever structure is more compact, and the number of parts for assembly is reduced. The specific shape of the lever 14 can be adjusted arbitrarily according to the shape of the lever accommodating space of the actual weighing cell and the shape and size of the opening of the lever accommodating space. As a modification, the lever 14 may be a sectional structure, that is, the reed connecting portion 141 and the magnetic system structure connecting portion 142 are connected by a connecting member.
The first fulcrum spring 161 and the second fulcrum spring 162 connect the first supporting portion 1221 of the extension portion 122 of the fixing portion 12, the second supporting portion and the lever 14 spring-connection first fulcrum connection portion 1412 and the lever 14 spring-connection second fulcrum connection portion 1413 together to serve as a supporting point of the lever 14.
In actual use, when a load is applied to the bearing part 11, the connecting spring 15 transmits a force to the lever 14, the lever 14 is out of balance, and after the long arm of the lever 14 is enlarged, the photoelectric detection slit (not shown) on the tail end of the lever 14 is deviated from the original balance position. The photoelectric displacement sensor (not shown) detects the change of the luminous flux passing through the photoelectric detection slit on the lever 14, and feeds back the change to the circuit device of the weighing sensor 1 to enable the circuit device to generate a corresponding compensation current. This current flows through a coil (not shown) at the end of the lever's long arm, which generates a compensating force (or balance force) in the fixed magnetic field, causing the lever 14 to return to equilibrium, i.e., the lever 14 detects the seam returning to equilibrium. The compensation current carries out a series of data acquisition and data processing through a circuit part of the electronic balance to obtain the actual weight of the loaded load.
In the embodiment, the connecting parts between the components are processed by utilizing the existing processing technology of the weighing sensor and are required to be cut into thin sheets with two thin ends relative to the connecting parts, so that the relative movement range of each part is further enlarged. Meanwhile, the structure is more compact, the production and processing cost is reduced, the assembly efficiency is improved, and the performance is more optimized.
In the modification of the present embodiment, the load receiving portion 11, the fixing portion 12, the parallel guide portions 131 and 132 connecting the load receiving portion 11 and the fixing portion 12, the lever 14, the connection spring 15, the first fulcrum spring 161, and the second fulcrum spring 162 may be separate structures, and the load cell 1 may be formed by assembling.
Although the present invention has been described with reference to a number of specific embodiments, those skilled in the art will appreciate that the above embodiments are illustrative only, and that various changes or substitutions can be made without departing from the spirit of the invention. Therefore, changes and modifications to the above-described embodiments within the spirit and scope of the present invention will fall within the scope of the claims of the present application.
Claims (10)
1. A load cell, comprising:
a bearing part;
the fixing part comprises a fixing part body and an extension part extending from the fixing part body to the bearing part;
the parallel guide part is respectively connected with the bearing part and the fixing part body; the bearing part, the fixing part body and the parallel guide part form an accommodating space; the extension part of the fixing part is arranged in the accommodating space;
a lever disposed in a space between the extension part of the fixing part and the parallel guide part;
a spring structure including a connection spring connecting the bearing part and the lever together for force transmission of the lever, and a fulcrum spring connecting the fixing part extension and the lever together for the lever supporting point;
the bearing part, the fixing part, the parallel guide part, the lever and the reed structure are of an integrated structure.
2. The load cell according to claim 1, wherein the parallel guide portion includes an upper parallel guide piece and a lower parallel guide piece, the upper parallel guide piece and the lower parallel guide piece are connected to the base portion of the bearing portion and the upper end and the lower end of the fixing portion body, respectively, and the connection portions of the parallel guide pieces with the fixing portion and the bearing portion are provided as thin pieces.
3. The load cell of claim 1,
the front end surface of the extension part of the fixing part respectively extends forwards to form a first support part and a second support part, and a concave structure is formed among the first support part, the second support part and the extension part;
the fulcrum reed comprises 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 of claim 3, wherein the lever comprises:
the reed connecting part is arranged at the front end of the lever and comprises a first fulcrum connecting part connected with the first fulcrum reed, a second fulcrum connecting part connected with the second fulcrum reed and a connecting reed connecting part connected with the connecting reed;
the counterweight extension part is arranged on the lower end surface of the reed connecting part and vertically extends downwards to be arranged in the concave structure;
and the magnetic system connecting part is arranged at the tail end of the lever and is connected to the magnetic system structure of the weighing sensor.
5. The load cell of claim 4, wherein the weight extension is integrally formed.
6. The load cell of claim 1,
the bearing part faces the base part of the lever and extends forwards to form an additional piece;
the attachment piece and the lever are connected by the connecting spring, and the cross-sectional area of the attachment piece is smaller than the cross-sectional area of the base of the bearing part.
7. The load cell according to claim 1, wherein the fixing portion body forms a through space in a longitudinal direction.
8. The load cell of claim 1, wherein the retention portion body upper end surface includes a laterally extending recess and extends from the retention portion body opposite the extension portion to form a magnetic system mounting portion.
9. The load cell of claim 1,
the parallel guide part and the lever are detachably connected through a temporary connecting sheet;
the extension portion and the lever are detachably connected through a temporary connecting piece.
10. An electronic balance, characterized in that it comprises a load cell according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020703910.7U CN212158768U (en) | 2020-04-30 | 2020-04-30 | Weighing sensor and electronic balance comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020703910.7U CN212158768U (en) | 2020-04-30 | 2020-04-30 | Weighing sensor and electronic balance comprising same |
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| Publication Number | Publication Date |
|---|---|
| CN212158768U true CN212158768U (en) | 2020-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020703910.7U Active CN212158768U (en) | 2020-04-30 | 2020-04-30 | Weighing sensor and electronic balance comprising same |
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| Country | Link |
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| CN (1) | CN212158768U (en) |
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- 2020-04-30 CN CN202020703910.7U patent/CN212158768U/en active Active
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