Sensor anti-static structure and weighing sensor assembly

Abstract

Provided are a sensor anti-static structure and a weighing sensor assembly. The weighing sensor assembly comprises a sensor body, a base and a connecting piece, the connecting piece comprises a pressing portion at an end portion, the sensor body comprises a through hole, the base comprises a threaded hole, the connecting piece penetrates through the through hole and is threadedly connected with the threaded hole, and the sensor body is fixed on the base by means of the pressing portion; the outer surfaces of the sensor body and the base are in conduction with the base by means of the threaded hole, a first non-coating surface is arranged at a region where the pressing portion abuts against the sensor body, a second non-coating surface is arranged at a region where the sensor body abuts against the pressing portion, and the first non-coating surface and the second non-coating surface are used for conducting the connecting piece and the sensor body. The structure further comprises a grounding piece arranged on the base and / or the sensor body and used for grounding. The sensor anti-static structure can effectively eliminate the risk caused by static electricity accumulation and avoid corrosion hazards.

Description

Technical Field

[0001] This utility model relates to the field of weighing sensors, and more specifically to the field of anti-static weighing sensors. Background Technology

[0002] When load cell assemblies are used in certain chemical weighing environments, they need to be covered with paint or parylene to protect them from acid, alkali, and salt corrosion. However, paint and parylene are insulating materials, and insulators easily accumulate static electricity. This accumulation can generate high voltage, posing a risk of discharge, sparks, and even explosions. Therefore, for coated load cells used in explosion-proof environments, a proper grounding method, such as a grounding device, must be ensured to eliminate the risk of static electricity buildup on the sensor surface.

[0003] A typical load cell assembly consists of a sensor body and a base. The sensor body is located on top of the base, and the two are connected by bolts or threads. When spraying insulating material, tape is often applied to the bottom surface of the sensor body and the top surface of the base that is in contact with the sensor body. After the tape is removed, these bottom and top surfaces become exposed metal surfaces, making the bottom surface of the sensor body and the top surface of the base electrically connected, and thus grounding is achieved through a grounding component.

[0004] However, this method results in a large area of ​​uncoated surfaces. These exposed areas are prone to corrosion, as corrosive substances can easily enter through the gap between the bottom of the sensor and the base, thus corroding both the sensor and the base. Utility Model Content

[0005] One objective of this invention is to provide an anti-static structure for sensors that can effectively eliminate the risks associated with static electricity buildup and prevent corrosion hazards.

[0006] To achieve the above objectives, an anti-static structure for the sensor is provided on the load cell assembly. The load cell assembly includes a sensor body, a base, and a connector. The connector includes a clamping portion at one end. The sensor body includes a through hole, and the base includes a threaded hole. The connector passes through the through hole and is threadedly connected to the threaded hole. The clamping portion secures the sensor body to the base. The outer surfaces of the sensor body and the base are connected. The connector is connected to the base via the threaded hole. The area where the clamping portion contacts the sensor body has a first uncoated surface, and the area where the sensor body contacts the clamping portion has a second uncoated surface. The first and second uncoated surfaces are used to connect the connector and the sensor body. The structure also includes a grounding component, provided on the base and / or the sensor body, for grounding.

[0007] In one or more embodiments, both the first uncoated surface and the second uncoated surface are annular surfaces.

[0008] In one or more embodiments, the second uncoated surface is covered by the clamping portion.

[0009] In one or more embodiments, the grounding element includes a grounding bolt, and the base and / or the sensor body are provided with a grounding threaded hole that mates with the grounding bolt, and the grounding bolt is in communication with the grounding threaded hole.

[0010] In one or more embodiments, the grounding element further includes a grounding wire, one end of which is electrically connected to the grounding bolt, and the other end of which is used for grounding.

[0011] In one or more embodiments, the grounding wire is electrically connected to the grounding bolt via a gasket.

[0012] In one or more embodiments, the through-hole is coated with an insulating material.

[0013] Another objective of this invention is to provide a weighing sensor assembly that includes the aforementioned anti-static structure.

[0014] The aforementioned anti-static structure of the weighing sensor enables the connectors originally used to connect the sensor body and the base to conduct electricity between the base and the sensor body simultaneously, eliminating the need for large areas of exposed metal surfaces and thus reducing the risk of corrosion. Furthermore, the grounding component discharges static electricity from the surfaces of the base and the sensor body, thereby eliminating the risk of static electricity accumulation on the sensor surface. Attached Figure Description

[0015] The above and other features, properties and advantages of this utility model will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein:

[0016] Figure 1 This is a schematic diagram of the weighing sensor.

[0017] Figure 2 This is a top view of the base;

[0018] Figure 3 It is an exploded view of the sensor body, base, and connectors;

[0019] Figure 4 This is a left view of the base and the sensor body;

[0020] Figure 5 This is a top view of the base and the sensor body;

[0021] Figure 6 This is a schematic diagram showing the sensor body, base, and connectors after assembly.

[0022] Figure 7 This is a schematic diagram of another embodiment of the sensor body.

[0023] Explanation of reference numerals in the attached figures

[0024] 10. Sensor Body

[0025] 13 Through holes

[0026] 15. Clamping part

[0027] 16 First Uncoated Surface

[0028] 17 Second Uncoated Surface

[0029] 20 bases

[0030] 24 Threaded hole

[0031] 30 Connectors

[0032] 40 Grounding component

[0033] 41 Grounding bolt

[0034] 42 Grounding wire

[0035] 50 Grounding threaded hole Detailed Implementation

[0036] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0037] It should be noted that these and other accompanying drawings are merely examples and are not drawn to scale, and should not be construed as limiting the scope of protection of this utility model.

[0038] In some chemical applications, such as strong acid chemical products like sulfuric acid (H2SO4), hydrochloric acid (HCl), and nitric acid (HNO3), strong alkali chemical products like sodium hydroxide (NaOH) and potassium hydroxide (KOH), fertilizer industrial products like phosphoric acid and ammonium nitrate, petrochemical and organic synthesis industrial products like terephthalic acid (PTA) and nitrocellulose, pharmaceutical products like antibiotics and vitamins, and the preparation and production of titanium dioxide, the acid and alkali concentrations in the environment are usually high, and flammable and explosive gases are generated.

[0039] In the preparation process for such applications, the load cells used for weighing must be coated.

[0040] Figure 1 The structure of the load cell is shown, including a sensor body 10 and a base 20, which are connected by a connector 30. The surfaces of the sensor body 10 and the base 20 must be coated with an insulating material such as paint or Parylene. However, the insulating material on the surface is prone to accumulating static electricity, leading to a risk of discharge. Therefore, an anti-static device is required on the load cell to eliminate the risk of static electricity buildup on the sensor surface.

[0041] Because existing coated sensors are generally manufactured using uncoated sensors through spray painting or vacuum phase deposition Parylene, the coating process involves applying tape to the bottom surface of the sensor and the mounting plate during spray painting, and then removing the tape after coating. Figure 2 The exposed area A shown is used to achieve electrical connection between the sensor and the base. However, this fabrication method results in a large area of ​​uncoated surface. This uncoated exposed area is prone to corrosion. For example, corrosive substances can easily enter through the gap between the bottom surface of the sensor and the base, thus corroding both the sensor and the base.

[0042] To address this issue, this disclosure proposes an anti-static structure for sensors that can effectively eliminate the risks associated with static electricity buildup and prevent potential corrosion.

[0043] like Figures 3 to 6 As shown, the sensor body 10 of the weighing sensor assembly has a through hole 13, the base 20 has a threaded hole 24, the connector 30 passes through the through hole 13 and is threadedly connected to the threaded hole 24, and the sensor body 10 is fixed on the base 20 by means of the clamping part 15 located at the end of the connector 30.

[0044] The through hole 13 is unthreaded and coated with insulating material, while the threaded hole 24 is a bare hole without insulating material. Therefore, the connector 30 is connected to the base 20 via the threaded hole 24. "Connection" refers to the formation of a current conduction state.

[0045] The outer surfaces of the sensor body 10 and the base 20 are coated with insulating material, so the sensor body 10 and the base 20 do not have exposed outer metal surfaces and are not directly conductive.

[0046] The sensor's anti-static structure uses a connector 30 to achieve indirect electrical connection between the sensor body 10 and the base 20. The connector 30 includes, but is not limited to, bolts.

[0047] The area where the clamping part 15 of the connector 30 is in contact with the sensor body 10 is provided with a first uncoated surface 16, and the area where the sensor body 10 is in contact with the clamping part 15 is provided with a second uncoated surface 17. The first uncoated surface 16 and the second uncoated surface 17 are used to conduct the connection between the connector 30 and the sensor body 10.

[0048] By abutting the first uncoated surface 16 and the second uncoated surface 17, an electrostatic conduction path is formed, realizing indirect conduction between the sensor body 10 and the base 20; at the same time, the area of ​​the first uncoated surface 16 and the second uncoated surface 17 is significantly reduced compared to the exposed area A, and even if there is an exposed part, it is covered by the clamping part of the connector, effectively preventing surface corrosion problems.

[0049] Furthermore, because the perimeter of the traditional exposed area A is very long, the coating and sensor often detach during thermal expansion and contraction, severely affecting the lifespan of the coated sensor. By using the first uncoated surface 16 and the second uncoated surface 17 as the exposed part, a ring with a very small perimeter is formed. The deformation of the coating in all directions is consistent during thermal expansion and contraction, greatly reducing the risk of detachment.

[0050] After the sensor body 10 and the base 20 are connected by the connector 30, they are grounded by the grounding component 40.

[0051] A grounding element 40 is disposed on the base 20 and / or the sensor body 10. In one embodiment, the grounding element 40 includes a grounding bolt 41 disposed on the base 20 and / or the sensor body 10, the grounding bolt 41 being in communication with a grounding threaded hole 50 (50') on the base 20 and / or the sensor body 10.

[0052] The grounding bolt 41 can be grounded directly or through the grounding wire 42. One end of the grounding wire 42 is electrically connected to the grounding bolt 41 through a washer, and the other end is grounded.

[0053] Figure 4 This is a schematic diagram of a grounding threaded hole 50 on the base 20. Since the internal thread surface is not coated with an insulating layer, the grounding bolt 41 is electrically connected to the base 20. After the sensor body 10 and the base 20 are electrically connected via the connector 30, static electricity on the surface is further discharged through the grounding bolt 41 and the grounding wire 42. At this time, except for the first uncoated surface 16, the sensor body 10 is coated with an insulating coating on all other locations, including the through hole 13; the base 20 is coated on all surfaces except for the threaded hole 24 and the grounding threaded hole 50. The inside of the threaded hole is blocked during the spraying process, leaving the inside of the threaded hole as an exposed area.

[0054] Figure 7 This is a schematic diagram showing a grounding threaded hole 50' on the sensor body 10. The grounding bolt 41 is connected to the sensor body 10 through the grounding threaded hole 50', and static electricity on the surfaces of the sensor body 10 and the base 20 is discharged through the grounding bolt 41 and the grounding wire 42. At this time, the sensor body 10 is coated with an insulating coating except for the first uncoated surface 16 and the grounding threaded hole 50'; the base 20 is coated except for the threaded hole 24.

[0055] exist Figure 5 In the embodiment shown, the first uncoated surface 16 of the clamping part 15 and the second uncoated surface 17 of the sensor body 10 are both annular surfaces.

[0056] To ensure no exposed metal, the second uncoated surface 17 is covered by the clamping portion 15. In one embodiment, the outer diameter R2 of the first uncoated surface 16 is made larger than the outer diameter R1 of the second uncoated surface 17 to ensure the second uncoated surface is not exposed. Alternatively... Figure 5 As shown, the outer diameter R2 of the first uncoated surface 16 is smaller than the outer diameter R1 of the second uncoated surface 17, such as 0.5 mm smaller, so that the second uncoated surface 17 completely covers the first uncoated surface 16, and the clamping part 15 can completely cover the second uncoated surface 17, so that no bare metal is exposed after installation.

[0057] The above-mentioned device can significantly improve the anti-static reliable grounding and corrosion resistance of the coated sensor, and is suitable for weighing, batching and process control in industries such as platform scales, chemical, food and pharmaceutical industries; it can also effectively reduce the conductive area and prevent corrosion problems.

[0058] Based on the above description of the sensor's anti-static structure, it can be understood that a weighing sensor including this anti-static structure has better anti-static and corrosion resistance capabilities.

[0059] It should be noted that the use of terms such as "first" and "second" to define the components in the above content is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application.

[0060] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic related to at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0061] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible variations and modifications without departing from the spirit and scope of the present invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. An anti-static structure for a sensor, mounted on a weighing sensor assembly, the weighing sensor assembly comprising a sensor body, a base, and a connector, the connector including a clamping portion at an end, the sensor body including a through hole, the base including a threaded hole, the connector passing through the through hole and threadedly connected to the threaded hole, the sensor body being fixed to the base by means of the clamping portion; characterized in that, The outer surfaces of the sensor body and the base; The connector communicates with the base via the threaded hole; The area where the clamping part is in contact with the sensor body is provided with a first uncoated surface, and the area where the sensor body is in contact with the clamping part is provided with a second uncoated surface. The first uncoated surface and the second uncoated surface are used to conduct the connection between the connector and the sensor body. The structure also includes a grounding element, disposed on the base and / or the sensor body, for grounding.

2. The sensor anti-static structure as described in claim 1, characterized in that, Both the first uncoated surface and the second uncoated surface are annular surfaces.

3. The sensor anti-static structure as described in claim 1, characterized in that, The second uncoated surface is covered by the clamping part.

4. The sensor anti-static structure as described in claim 1, characterized in that, The grounding component includes a grounding bolt, and the base and / or the sensor body are provided with a grounding threaded hole that mates with the grounding bolt, and the grounding bolt is in communication with the grounding threaded hole.

5. The sensor anti-static structure as described in claim 4, characterized in that, The grounding component also includes a grounding wire, one end of which is electrically connected to the grounding bolt, and the other end is used for grounding.

6. The sensor anti-static structure as described in claim 5, characterized in that, The grounding wire is electrically connected to the grounding bolt via a gasket.

7. The sensor anti-static structure as described in claim 1, characterized in that, The through-hole is coated with insulating material.

8. A weighing sensor assembly, characterized in that, Includes the sensor anti-static structure as described in any one of claims 1-7.

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