Anti-unbalance plane beam load cell

Abstract

The utility model discloses a kind of flat beam load cell of deviation load prevention, including sensor body and steel ball component, the sensor body includes elastomer and the strain gauge on elastomer, the elastomer sequentially includes upper bearing part, middle part and lower bearing part from top to bottom, the upper bearing part and the both sides of middle part are respectively provided with upper connecting part, and upper deformation cavity is formed between the upper connecting part of both sides, the middle part between the middle part and lower bearing part is provided with lower connecting part, and lower deformation cavity is respectively formed in the both sides of lower connecting part. The utility model has the advantages of simple structure, reasonable, which forms double-column structure in the upper part of elastomer, and then makes elastomer close to steel ball part form stable structure, when weighing, using stable double-column structure to resist lateral component force when weighing, so as to prevent deviation load.

Description

Technical Field

[0001] This utility model relates to the field of weighing sensor manufacturing technology, specifically a planar beam weighing sensor for preventing off-center loading. Background Technology

[0002] Currently, load cells are widely used in various electronic weighing equipment such as truck scales, rail scales, axle weighing scales, and tank scales. They have advantages such as stable and reliable performance, excellent dynamic response, and strong adaptability. Truck scales, also known as weighbridges, are the main weighing equipment used by factories, mines, and businesses for measuring bulk goods.

[0003] When a truck scale is used for weighing, sometimes the truck is in motion (or not completely stationary). In this case, the vehicle will generate a horizontal component force on the load cell, causing the load cell to be unbalanced, which will greatly affect the accuracy of weighing. Therefore, the existing load cell structure needs to be further improved. Utility Model Content

[0004] The purpose of this utility model is to overcome the above-mentioned deficiencies and to disclose to the public a planar beam weighing sensor with a reasonable structure that can improve the stability of the weighing sensor and prevent off-center loading.

[0005] The technical solution of this utility model is implemented as follows:

[0006] A planar beam load cell for preventing eccentric loading includes a sensor body and a steel ball assembly. The sensor body includes an elastic body and a strain gauge located on the elastic body. The elastic body includes an upper bearing part, a middle part and a lower bearing part from top to bottom. Upper connecting parts are respectively provided on both sides between the upper bearing part and the middle part, and an upper deformation cavity is formed between the upper connecting parts on both sides. A lower connecting part is provided in the middle between the middle part and the lower bearing part, and lower deformation cavities are respectively formed on both sides of the lower connecting part.

[0007] Further optimization measures for this technical solution are as follows:

[0008] As an improvement, an enlarged portion is provided on the inner side of the lower deformation cavity. The enlarged portion facilitates the deformation of the lower deformation cavity and reduces stress concentration on the inner side of the lower deformation cavity.

[0009] As an improvement, grooves are provided at intervals on the upper and lower surfaces of the middle section. The grooves concentrate the force on the elastomer, making the strain gauge deformation data collection more focused and improving accuracy.

[0010] As an improvement, the steel ball assembly is disposed above the elastic body, and the steel ball assembly includes, from top to bottom, an upper mounting base, a steel ball, and a lower mounting base.

[0011] As an improvement, the upper mounting base is provided with an upper concave surface, and the lower mounting base is provided with a lower concave surface. The upper and lower concave surfaces allow the steel ball to self-center, further preventing off-center loading.

[0012] As an improvement, the elastic body is provided with a limiting sleeve whose cross-sectional shape is adapted to the installation position. By using the limiting sleeve and the installation position to form a limit, the overall off-center loading of the weighing sensor can be further prevented.

[0013] As an improvement, an inner liner is provided between the elastomer and the limiting sleeve, and sealant is filled between the elastomer and the inner liner. The sealant forms a sealing layer, preventing external debris from entering the elastomer and affecting its accuracy.

[0014] As an improvement, the inner liner is formed by the mating and fixing of a first inner liner body and a second inner liner body. This mating structure is simple and easy to assemble.

[0015] As an improvement, the upper end of the limiting sleeve extends inward to form an upward flange, and the lower end of the limiting sleeve extends inward to form a downward flange.

[0016] As an improvement, the elastic body is provided with an upper assembly groove and a lower assembly groove, the upper flange is fitted into the upper assembly groove, and the lower flange is fitted into the lower assembly groove.

[0017] The advantages of this utility model compared with the prior art are:

[0018] This utility model discloses a planar beam load cell for preventing off-center loading. It has a simple and reasonable structure. It has upper connecting parts on both sides between the upper bearing part and the middle part of the elastic body, thereby forming a double column structure on the upper part of the elastic body. This makes the part of the elastic body near the steel ball form a stable structure. When the weighing device weighs, the stable double column structure resists the lateral component force during weighing, thereby achieving the purpose of preventing off-center loading. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of this utility model;

[0020] Figure 2 This is a cross-sectional view of Embodiment 1 of this utility model;

[0021] Figure 3 This is an exploded view of Embodiment 1 of this utility model;

[0022] Figure 4 yes Figure 3 Enlarged view of section A in the middle;

[0023] Figure 5 yes Figure 3 Enlarged view of section B in the middle;

[0024] Figure 6 This is a schematic diagram of the structure of the elastomer in Embodiment 2 of this utility model.

[0025] The names of the reference numerals in the accompanying drawings of this utility model are:

[0026] Elastomer 1, upper mounting groove 1a, lower mounting groove 1b, upper bearing part 11, middle part 12, groove 12a, lower bearing part 13, upper connecting part 14, upper deformation cavity 14a, lower connecting part 15, lower deformation cavity 15a, enlarged part 15b, upper mounting seat 21, upper concave surface 21a, steel ball 22, lower mounting seat 23, lower concave surface 23a, limiting sleeve 3, upper flange 31, lower flange 32, inner liner 4, first inner liner body 41, second inner liner body 42. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings:

[0028] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will be apparent to those skilled in the art. The basic principles of the present invention defined in the following description can be used in other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0029] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or position based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0030] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0031] Example 1, as Figures 1 to 5As shown, a planar beam load cell for preventing eccentric loading includes a sensor body and a steel ball assembly. The sensor body includes an elastic body 1 and a strain gauge located on the elastic body. The elastic body 1 includes an upper bearing part 11, a middle part 12 and a lower bearing part 13 from top to bottom. Upper connecting parts 14 are respectively provided on both sides between the upper bearing part 11 and the middle part 12, and an upper deformation cavity 14a is formed between the upper connecting parts 14 on both sides. A lower connecting part 15 is provided in the middle between the middle part 12 and the lower bearing part 13, and a lower deformation cavity 15a is respectively formed on both sides of the lower connecting part 15.

[0032] An enlarged portion 15b is provided on the inner side of the lower deformation cavity 15a. In this embodiment, the two ends of the enlarged portion 15b are arc-shaped. The enlarged portion 15b is beneficial to the deformation of the lower deformation cavity 15a and reduces the stress concentration on the inner side of the lower deformation cavity 15a.

[0033] The steel ball assembly is disposed above the elastic body 1, and the steel ball assembly includes, from top to bottom, an upper mounting base 21, a steel ball 22, and a lower mounting base 23.

[0034] The upper mounting base 21 is provided with an upper concave surface 21a, and the lower mounting base 23 is provided with a lower concave surface 23a. Both the upper concave surface 21a and the lower concave surface 23a are spherical structures, and the radius of the sphere is larger than the radius of the steel ball 22. The arrangement of the upper concave surface 21a and the lower concave surface 23a allows the steel ball 22 to be self-centered, which can further prevent off-center loading.

[0035] The elastic body 1 is provided with a limiting sleeve 3 whose cross-sectional shape is adapted to the installation position. The limiting sleeve 3 adopts an integral rubber-coated structure. During the installation of the load cell, the limiting sleeve 3 is set between the elastic body 1 and the installation position, and the limiting sleeve 3 with a cross-sectional shape adapted to the installation position is used to limit the load cell in the horizontal direction, which can further prevent the overall unbalanced load of the load cell.

[0036] An inner liner 4 is provided between the elastic body 1 and the limiting sleeve 3, and the space between the elastic body 1 and the inner liner 4 is filled with sealant.

[0037] The inner liner 4 is formed by the first inner liner body 41 and the second inner liner body 42 being joined and fixed together.

[0038] During assembly, the first inner liner 41 and the second inner liner 42 are fitted together and cover the outside of the elastomer 1. The inner liner 4 adopts a mating structure, which is simple and easy to assemble. Glue is injected into the inner liner 4 to form a sealing layer to prevent external debris from entering the elastomer 1 and affecting the accuracy of the weighing sensor, so as to better adapt to the outdoor use environment.

[0039] The upper end of the limiting sleeve 3 extends inwards to form an upward flanging 31, and the lower end of the limiting sleeve 3 extends inwards to form a downward flanging 32.

[0040] The elastic body 1 is provided with an upper assembly groove 1a and a lower assembly groove 1b. The upward flanging 31 is fitted into the upper assembly groove 1a, and the downward flanging 32 is fitted into the lower assembly groove 1b.

[0041] With such a setting, the assembly of the limiting sleeve 3 is more reliable. The upward flanging 31 and the downward flanging 32 make the limiting sleeve 3 form a covering structure with a "C" - shaped cross - section, which can play a certain role in protecting the internal structure.

[0042] A kind of anti - eccentric - load planar beam weighing sensor of the utility model, its elastic body 1 successively includes an upper bearing part 11, a middle part 12 and a lower bearing part 13 from top to bottom. Upper connecting parts 14 are respectively arranged on both sides between the upper bearing part 11 and the middle part 12 of the elastic body 1, so as to form a double - column structure on the upper part of the elastic body 1. Furthermore, a stable structure is formed near the steel ball 22 of the elastic body 1. When the weighing device weighs, the stable double - column structure is used to resist the lateral component force during weighing, so as to achieve the purpose of preventing eccentric load.

[0043] Embodiment 2, as Figure 6 shown, in the planar beam weighing sensor of this embodiment, on the basis of Embodiment 1, grooves 12a are arranged at intervals on the upper and lower surfaces of the middle part 12. The cross - section of the groove 12a is in a semi - circular structure. The setting of the groove 12a makes the force on the elastic body 1 more concentrated, and the deformation acquisition of the strain gauge is more concentrated, which can improve the accuracy.

[0044] The above are only preferred embodiments of the utility model, and do not limit the implementation manners and protection scope of the utility model. For those skilled in the art, it should be realized that all equivalent replacements and obvious changes made by using the description and illustrations of the utility model should be included in the protection scope of the utility model.

Claims

1. A planar beam load cell for preventing eccentric loading, comprising a sensor body and a steel ball assembly, characterized in that: The sensor body includes an elastic body (1) and a strain gauge located on the elastic body. The elastic body (1) includes an upper support part (11), a middle part (12) and a lower support part (13) from top to bottom. An upper connecting part (14) is provided on both sides between the upper support part (11) and the middle part (12), and an upper deformation cavity (14a) is formed between the upper connecting parts (14) on both sides. A lower connecting part (15) is provided in the middle between the middle part (12) and the lower support part (13), and a lower deformation cavity (15a) is formed on both sides of the lower connecting part (15).

2. The anti-eccentric load planar beam weighing sensor according to claim 1, characterized in that: An enlarged portion (15b) is provided on the inner side of the lower deformation cavity (15a).

3. A planar beam load cell for preventing off-center loading according to claim 2, characterized in that: The upper and lower surfaces of the middle part (12) are provided with grooves (12a) at intervals.

4. A planar beam load cell for preventing off-center loading according to claim 3, characterized in that: The steel ball assembly is disposed above the elastic body (1), and the steel ball assembly includes, from top to bottom, an upper mounting base (21), a steel ball (22), and a lower mounting base (23).

5. A planar beam load cell for preventing off-center loading according to claim 4, characterized in that: The upper mounting base (21) is provided with an upper concave surface (21a), and the lower mounting base (23) is provided with a lower concave surface (23a).

6. A planar beam load cell for preventing off-center loading according to claim 5, characterized in that: The elastic body (1) is provided with a limiting sleeve (3) whose cross-sectional shape is adapted to the installation position.

7. A planar beam load cell for preventing off-center loading according to claim 6, characterized in that: An inner liner (4) is provided between the elastomer (1) and the limiting sleeve (3), and sealant is filled between the elastomer (1) and the inner liner (4).

8. A planar beam load cell for preventing off-center loading according to claim 7, characterized in that: The inner liner (4) is formed by the first inner liner body (41) and the second inner liner body (42) being joined and fixed together.

9. A planar beam load cell for preventing eccentric loading according to claim 8, characterized in that: The upper end of the limiting sleeve (3) extends inward to form an upper flange (31), and the lower end of the limiting sleeve (3) extends inward to form a lower flange (32).

10. A planar beam load cell for preventing eccentric loading according to claim 9, characterized in that: The elastic body (1) is provided with an upper assembly groove (1a) and a lower assembly groove (1b), the upper flange (31) is fitted into the upper assembly groove (1a), and the lower flange (32) is fitted into the lower assembly groove (1b).

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