Sealing structure of weighing sensor

Abstract

The utility model discloses a sealing structure of a weighing sensor, which comprises a sensor, the sensor comprises an elastic body and a strain gauge arranged on the elastic body, an inner container is arranged outside the middle part of the elastic body, an outer protective shell is arranged outside the inner container, and the outer protective shell is connected with the elastic body. A sealing ring is arranged at the upper end of the inner container between the elastic body and the inner container, the upper portion of the sealing ring extends out of the upper end face of the inner container, a sealing ring groove is formed in the elastic body, the sealing ring is embedded in the sealing ring groove, a pressing plane is arranged on the inner container, and the sealing ring is arranged on the pressing plane. And the pressing plane presses the sealing ring from the outer side of the sealing ring. The sensor has the advantages that the structure is reasonable, the sealing performance is improved through the arrangement of the sealing ring, and in addition, the outer side is provided with a vertical plane pressing structure, so that the influence on the precision caused by external force generated on the sensor due to thermal expansion and cold contraction of the liner can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of weighing sensor manufacturing technology, specifically a sealed structure for a weighing sensor. Background Technology

[0002] 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. Some electronic weighing equipment is used outdoors, which makes the load cells susceptible to corrosion from rain and dust. Rain and dust can reduce the accuracy and lifespan of the load cells. Therefore, existing load cells are generally equipped with a sealed protective structure.

[0003] The two most common sealing and protection processes for existing load cells are laser / argon arc welding and adhesive bonding. Laser / argon arc welding has technical challenges, including complex operation, high process requirements, and complex manufacturing, and it also has special material requirements, resulting in higher costs. Adhesive bonding, while simpler, suffers from poor sealing and protection, and its stability is unsatisfactory. With long-term use, the sealant quality deteriorates, leading to a decrease in the product's sealing rating and severely impacting product performance.

[0004] To overcome the above-mentioned defects, a sealed protective structure was designed, as seen in the patent application CN2024219652913 entitled "A Sealed Protective Structure for a Weighing Sensor". This structure forms a double-shell protective structure by setting an inner liner and an outer protective shell outside the inner liner. However, the inner liner is directly attached to the sensor. Due to the thermal expansion and contraction (micro-deformation) of the inner liner, external forces will be generated on the sensor, affecting the accuracy of the sensor. Therefore, this sealing structure needs further improvement. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned deficiencies and to disclose to the public a sealing structure for a weighing sensor that has a reasonable structure, good sealing effect, and does not affect the accuracy of the sensor.

[0006] The technical solution of this utility model is implemented as follows:

[0007] A sealing structure for a weighing sensor includes a sensor comprising an elastomer and a strain gauge located on the elastomer. An inner liner is disposed outside the middle portion of the elastomer, and an outer protective shell is disposed outside the inner liner. A sealing ring is disposed between the elastomer and the inner liner at the upper end of the inner liner, with the upper part of the sealing ring extending beyond the upper end face of the inner liner. A sealing ring groove is provided on the elastomer, and the sealing ring is embedded in the sealing ring groove. A pressing plane is provided on the inner liner, and the pressing plane presses the sealing ring from the outside.

[0008] Further optimization measures for this technical solution are as follows:

[0009] As an improvement, the upper end of the outer protective shell extends inward to form an upward flange, which is located above the sealing ring, and the lower end of the outer protective shell extends inward to form a downward flange.

[0010] As an improvement, the elastomer has an assembly groove above the sealing ring groove, and the upper flange extends into the assembly groove. The assembly groove facilitates the external fitting of the outer protective shell, and the upper flange positioned above the sealing ring prevents the sealing ring from being exposed, thus improving the service life of the sealing ring.

[0011] As an improvement, the cross-section of the sealing ring is rectangular, and correspondingly, the cross-section of the sealing ring groove is also rectangular.

[0012] 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.

[0013] As an improvement, the outer wall of the inner liner is provided with an annular groove, and the inner wall of the outer protective shell is provided with a protrusion that matches the annular groove. This design can improve the bonding force between the outer protective shell and the inner liner.

[0014] As an improvement, the inner liner is provided with an injection hole, and the injection hole is fitted with a stopper. The stopper allows the inner liner to form a closed space, enabling the sealant to solidify better and form a sealing layer.

[0015] As an improvement, the outer protective shell is an injection-molded integral structure.

[0016] The advantages of this utility model compared with the prior art are:

[0017] This utility model discloses a sealing structure for a weighing sensor. The structure is reasonable, with a sealing ring set at the upper end of the inner liner between the elastic body and the inner liner. The sealing ring improves the sealing performance. In addition, the inner side of the sealing ring is placed in the sealing ring groove, which limits the sealing ring. The outer side of the sealing ring is pressed by the pressing plane of the inner liner to ensure the sealing performance. The vertical plane pressing structure on the outer side can prevent the inner liner from generating external force on the sensor due to thermal expansion and contraction, which would affect the accuracy. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of this utility model;

[0019] Figure 2 This is a cross-sectional structural diagram of Embodiment 1 of this utility model;

[0020] Figure 3 yes Figure 2 Enlarged view of section A in the middle;

[0021] Figure 4 yes Figure 1 3D structural diagram after removing the outer protective shell;

[0022] Figure 5 yes Figure 4 Enlarged view of section B;

[0023] Figure 6 This is an exploded view of Embodiment 1 of this utility model;

[0024] Figure 7 yes Figure 6 Enlarged view of section C;

[0025] Figure 8 yes Figure 1 Cross-sectional structural diagram of the inner and outer protective shells;

[0026] Figure 9 This is an exploded view of Embodiment 2 of this utility model.

[0027] The names of the reference numerals in the accompanying drawings of this utility model are:

[0028] 1. Elastomer, 1a. Sealing groove, 1b. Assembly groove, 2. Inner liner, 2a. Pressing plane, 2b. Annular groove, 2c. Glue injection hole, 21. First inner liner, 22. Second inner liner, 3. Outer protective shell, 3a. Raised strip, 31. Upper flange, 32. Lower flange, 4. Sealing ring, 5. Plug. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings:

[0030] 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.

[0031] 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.

[0032] 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.

[0033] Example 1, as Figures 1 to 8 As shown, a sealing structure for a weighing sensor includes a sensor comprising an elastic body 1 and a strain gauge located on the elastic body. An inner liner 2 is disposed outside the middle of the elastic body 1, and an outer protective shell 3 is disposed outside the inner liner 2. A sealing ring 4 is disposed between the elastic body 1 and the inner liner 2 at the upper end of the inner liner 2, with the upper part of the sealing ring 4 extending beyond the upper end face of the inner liner 2. A sealing ring groove 1a is provided on the elastic body 1, and the sealing ring 4 is embedded in the sealing ring groove 1a. A pressing plane 2a is provided on the inner liner 2, and the pressing plane 2a presses the sealing ring 4 from the outside.

[0034] The sensor is existing technology, and its structure and working principle will not be elaborated here. The pressing plane 2a is vertically arranged, pressing the sealing ring 4 only from the outside. That is, the pressing plane 2a only exerts horizontal inward pressure on the sealing ring 4, and does not generate vertical force. The upper part of the sealing ring 4 extends beyond the upper end face of the inner liner 2, that is, the sealing ring 4 penetrates the upper edge of the inner liner 2. This arrangement helps to ensure the sealing between the inner liner 2 and the sealing ring 4.

[0035] The upper end of the outer protective shell 3 extends inward to form an upward flange 31, which is located above the sealing ring 4. The lower end of the outer protective shell 3 extends inward to form a downward flange 32.

[0036] An assembly groove 1b is provided above the sealing ring groove 1a on the elastic body 1, and the upper flange 31 extends into the assembly groove 1b. This arrangement facilitates the assembly of the outer protective shell 3. After assembly, the upper flange 31 is located above the sealing ring 4, which can prevent the sealing ring 4 from being exposed and improve the service life of the sealing ring 4.

[0037] The sealing ring 4 has a rectangular cross-section, and correspondingly, the sealing ring groove 1a also has a rectangular cross-section.

[0038] The inner liner 2 is formed by the mating and fixing of a first inner liner body 21 and a second inner liner body 22. This mating structure is simple and easy to assemble; after the first inner liner body 21 and the second inner liner body 22 are mated, they are fixed together with bolts.

[0039] The outer wall of the inner liner 2 is provided with an annular groove 2b, and the inner wall of the outer protective shell 3 is provided with a protrusion 3a that matches the annular groove 2b. The cooperation between the annular groove 2b and the protrusion 3a can improve the bonding force between the outer protective shell 3 and the inner liner 2, thereby improving the protection.

[0040] The outer protective shell 3 is an integral structure formed by injection molding.

[0041] In this embodiment, the first inner liner 21 and the second inner liner 22 are integral structures formed by injection molding.

[0042] Example 2, as Figure 9 As shown, the structure of this embodiment is similar to that of Embodiment 1. The difference is that in this embodiment, the inner liner 2 is provided with an injection hole 2c, and the injection hole 2c is provided with a stopper 5.

[0043] In this embodiment, the inner liner 2 has a cavity. Sealant is injected into the cavity through the injection hole 2c. The sealant is liquid when injected and solidifies into a gel-like state. The injected sealant coats the sensor, improving its sealing performance. The stopper 5 allows the inner liner 2 to form a closed space, enabling the sealant to solidify better and form a sealing layer.

[0044] The sealing structure of the weighing sensor of this utility model has a sealing ring 4 set at the upper end of the inner liner 2 between the elastic body 1 and the inner liner 2. The sealing ring 4 improves the sealing performance. In addition, the inner side of the sealing ring 4 is placed in the sealing ring groove 1a. The sealing ring groove 1a limits the sealing ring 4 and prevents the sealing ring 4 from shifting. The outer side of the sealing ring 4 is pressed by the pressing plane 2a of the inner liner 2 to ensure the sealing performance. The vertical plane pressing structure on the outer side can prevent the inner liner 2 from generating external force on the sensor 1 due to thermal expansion and contraction, which would affect the accuracy.

[0045] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sealed structure for a weighing sensor, comprising a sensor, the sensor including an elastic body (1) and a strain gauge located on the elastic body, wherein an inner liner (2) is disposed outside the middle portion of the elastic body (1), and an outer protective shell (3) is disposed outside the inner liner (2), characterized in that: A sealing ring (4) is provided at the upper end of the inner liner (2) between the elastomer (1) and the inner liner (2). The upper part of the sealing ring (4) extends out of the upper end face of the inner liner (2). A sealing ring groove (1a) is provided on the elastomer (1). The sealing ring (4) is embedded in the sealing ring groove (1a). A pressing plane (2a) is provided on the inner liner (2). The pressing plane (2a) presses the sealing ring (4) from the outside of the sealing ring (4).

2. The sealing structure of a weighing sensor according to claim 1, characterized in that: The upper end of the outer protective shell (3) extends inward to form an upper flange (31), which is located above the sealing ring (4). The lower end of the outer protective shell (3) extends inward to form a lower flange (32).

3. The sealing structure of a weighing sensor according to claim 2, characterized in that: An assembly groove (1b) is provided above the sealing ring groove (1a) on the elastomer (1), and the upper flange (31) extends into the assembly groove (1b).

4. The sealing structure of a weighing sensor according to claim 3, characterized in that: The sealing ring (4) has a rectangular cross-section, and correspondingly, the sealing ring groove (1a) also has a rectangular cross-section.

5. The sealing structure of a weighing sensor according to claim 4, characterized in that: The inner liner (2) is formed by the first inner liner body (21) and the second inner liner body (22) being joined and fixed together.

6. The sealing structure of a weighing sensor according to claim 5, characterized in that: The outer wall of the inner liner (2) is provided with an annular groove (2b), and the inner wall of the outer protective shell (3) is provided with a protrusion (3a) that matches the annular groove (2b).

7. The sealing structure of a weighing sensor according to claim 6, characterized in that: The inner liner (2) is provided with a glue injection hole (2c), and a plug (5) is provided on the glue injection hole (2c).

8. The sealing structure of a weighing sensor according to claim 7, characterized in that: The outer protective shell (3) is an integral structure formed by injection molding.

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