Weighing sensor with double-layer sealing protection structure

Abstract

The invention discloses a weighing sensor with a double-layer sealing protection structure, and relates to the technical field of liquid weighing, the weighing sensor comprises a force bearing seat, a shell and a mounting seat, pressure bearing rods are arranged among the force bearing seat, the shell and the mounting seat, the force bearing seat, the shell and the mounting seat are fixedly connected in sequence through the pressure bearing rods, a multi-beam pressure bearing beam is arranged in the shell, and the multi-beam pressure bearing beam is arranged in the shell. The shell is a quadrangular prism, and elastic diaphragms are arranged on the two sides, corresponding to the stress base and the installation base, of the shell. Stress borne by the main beam can be measured through the strain gauge, the elastic sealing cover is welded to the circular groove hole through laser, so that the strain gauge is sealed for the first time, the cover plate is welded to the side face of the shell through laser, and the strain gauge is sealed for the second time. The influence of corrosive liquid on the welding seam of the sensor is greatly reduced, and through the structural design of the special-shaped groove hole and the elastic arc film, the cover plate and the elastic sealing cover do not have any influence on stress after being welded.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of liquid weighing, and in particular to a weighing sensor with a double-layer sealing protection structure. Background Art

[0002] Weighing sensors usually work based on strain gauge technology, piezoelectric effect or electromagnetic force balance principle. Taking strain gauge sensors as an example, their core components are elastomers and resistance strain gauges. When pressure is applied to the elastomer, the elastomer produces a slight deformation, and the resistance value of the strain gauge attached to its surface changes accordingly. The resistance change is converted into an electrical signal (voltage or current) through the measuring circuit, and the weight is calculated; the sensor output signal is linearly related to the mass, ensuring the accuracy of the measurement. It is usually used for liquid foods such as cooking oil, milk, liquid condiments, etc., chemical products such as pesticides, fertilizers, etc., and medical industry supplies such as disinfectants and pharmaceutical reagents. These products all require weighing and metering of raw materials during production.

[0003] However, existing weighing sensors are often sealed with silicone, which doesn't provide a complete waterproof seal and can fail after a period of use. In recent years, with advancements in technology, some sensor manufacturers have developed laser-welded sealed sensors, which offer excellent sealing and long-lasting performance. However, long-term use of these sensors in liquid environments, particularly those with corrosive fluids such as chemicals and medical supplies, can easily lead to corrosion at the weld seams, causing sensor damage. Due to the high production volumes of manufacturers, sensor replacements often require downtime for maintenance, disrupting continuous production and causing significant losses.

[0004] Therefore, developing a weighing sensor with good sealing effect, a protective structure and long-term use is a technical problem that needs to be solved urgently by people in this technical field. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a weighing sensor with a double-layer sealing protection structure to solve the technical problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A weighing sensor with a double-layer sealing protection structure includes a force-bearing seat, a shell, and a mounting seat. Pressure rods are provided between the force-bearing seat, the shell, and the mounting seat, and are fixedly connected in sequence through the pressure rods. A multi-beam pressure beam is provided inside the shell. Elastic diaphragms are provided on the side walls of both ends of the shell and on one end of the pressure rods. Cover plates are embedded on both sides of the shell.

[0008] The multi-beam pressure-bearing beam includes a symmetrically arranged beam seat, an elastic circular arc membrane, a main beam and a side beam. The main beam is fixed between the two beam seats, the side beams are distributed on both sides of the main beam, and the side beams are fixedly connected to the beam seat through the elastic circular arc membrane. A strain gauge is attached and fixed to the top of the main beam, and circular slots that penetrate each other are opened on both sides of the main beam. Elastic sealing covers are fixedly installed on the circular slots. A special-shaped slot is opened on the side of the side beam, and the special-shaped slot is located on the outside of the circular slot.

[0009] Preferably, the shell is a quadrangular prism, and the top and bottom of the shell are both provided with prismatic protrusions.

[0010] Preferably, the pressure-bearing rod includes a first pressure-bearing rod and a second pressure-bearing rod, the first pressure-bearing rod is fixed between the force-bearing seat and the shell, and the second pressure-bearing rod is fixed between the shell and the mounting seat.

[0011] Preferably, the number of the elastic circular arc membranes is four, and the four elastic circular arc membranes are symmetrically distributed on both sides of the main beam.

[0012] Preferably, a cable plug is provided at the bottom of the mounting seat, the cable plug is fixedly connected to the mounting seat, and the strain gauge is electrically connected to the cable plug.

[0013] Preferably, the elastic sealing cover is cylindrical, and one end of the elastic sealing cover close to the main beam is closed, and the other end extends outward to form a protruding edge;

[0014] The elastic sealing cover is installed on the circular slot, and the edge of the elastic sealing cover is welded and fixed on the multi-beam pressure-bearing beam and is sealed with the multi-beam pressure-bearing beam.

[0015] Preferably, there are two elastic sealing covers, which are respectively located on both sides of the main beam, and there is a gap between one end of the elastic sealing cover and the main beam.

[0016] Preferably, the width of the edge of the elastic sealing cover is smaller than the thickness of the elastic arc membrane.

[0017] Preferably, the outer side wall of the pressure-bearing rod and the opposite side surfaces of the force-bearing seat and the mounting seat all have prismatic protrusions.

[0018] Preferably, a slot is provided on the shell at a connection position corresponding to the cover plate, the cover plate is sealingly mounted on the inner side of the slot, and the cover plate is fixed to the shell by welding.

[0019] In summary, the present invention mainly has the following beneficial effects:

[0020] In the present invention, when the force-bearing seat receives a load, the force will be transmitted to the multi-beam pressure-bearing beam through the elastic diaphragm, and the stress on the main beam will be measured by the strain gauge, thereby measuring the pressure value. The elastic sealing cover is laser welded on the circular slot hole, so that the strain gauge obtains the first seal, and the cover plate is laser welded on the side of the shell, so that the strain gauge obtains the second seal. Through the special design of the sensor structure, a double-layer protective structure is designed, which greatly reduces the influence of corrosive liquid on the sensor weld. Through the structural design of the special-shaped slot hole and the elastic arc diaphragm, the cover plate and the elastic sealing cover will not have any influence on the force after welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the present invention after removing the cover plate and the elastic sealing cover;

[0022] Figure 2 It is a schematic diagram of the top view of the structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the present invention after removing the cover plate;

[0024] Figure 4 It is a front view structural schematic diagram of the present invention.

[0025] Description of reference numerals:

[0026] 1. Force bearing seat;

[0027] 2. Shell; 201. Prismatic protrusion; 202. Circular slot; 203. Special-shaped slot; 21. Multi-beam pressure beam; 211. Beam seat; 212. Elastic arc membrane; 213. Main beam; 214. Side beam;

[0028] 3. Mounting base; 31. Cable plug;

[0029] 4. Pressure-bearing rod; 41. First pressure-bearing rod; 42. Second pressure-bearing rod;

[0030] 5. Cover plate;

[0031] 6. Elastic sealing cover;

[0032] 7. Strain gauge;

[0033] 8. Elastic diaphragm. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0035] Example

[0036] like Figures 1 to 4As shown, a double-layer protective sealed weighing sensor includes a force-bearing seat 1, a shell 2 and a mounting seat 3. A pressure rod 4 is provided between the force-bearing seat 1, the shell 2 and the mounting seat 3, and they are fixedly connected in sequence through the pressure rod 4. A multi-beam pressure beam 21 is provided inside the shell 2. The shell 2 is a quadrangular prism, and elastic diaphragms 8 are provided on both sides of the shell 2 corresponding to the force-bearing seat 1 and the mounting seat 3. The elastic diaphragm 8 is fixedly connected to the shell 2, and the two sides of the elastic diaphragm 8 are respectively fixedly connected to the multi-beam pressure beam 21 and the pressure rod 4. The top and bottom of the shell 2 have prismatic protrusions 201, and the remaining two side surfaces of the shell 2 are provided with a cover plate 5, which is fixedly connected to the shell 2. The multi-beam pressure beam 21 includes a beam The seat 211, the elastic arc membrane 212, the main beam 213 and the side beam 214, there are two beam seats 211, and they are fixedly connected to the two elastic diaphragms 8 respectively. The main beam 213 is fixed between the two beam seats 211, and the side beams 214 are distributed on both sides of the main beam 213. The side beams 214 are fixedly connected to the beam seats 211 through the elastic arc membrane 212. The main beam 213 is attached with a strain gauge 7 for measuring pressure. Circular slots 202 that penetrate each other are opened on both sides of the main beam 213, and an elastic sealing cover 6 is fixedly installed on the circular slot 202. A special-shaped slot 203 that penetrates is opened on the side of the side beam 214, and the special-shaped slot 203 is located on the outside of the circular slot 202.

[0037] It should be noted that, in this embodiment, the sensor is designed with a force-bearing seat 1, a shell 2 and a mounting seat 3, and the sensor is designed with a machinable elastic diaphragm 8. The multi-beam pressure-bearing beam 21 includes a beam seat 211, an elastic arc diaphragm 212, a main beam 213 and a side beam 214. When the force-bearing seat 1 receives a load, the force will be transmitted to the multi-beam pressure-bearing beam 21 through the elastic diaphragm 8. A strain gauge 7 will be attached to the main beam 213. The stress on the main beam 213 will be measured by the strain gauge 7, thereby measuring the pressure value. The elastic sealing cover 6 is laser welded on the circular slot 202 so that the strain gauge 7 obtains a first seal, and the cover plate 5 is laser welded to the side of the shell 2 so that the strain gauge 7 obtains a second seal. Through the special design of the sensor structure, a double-layer protective structure is designed, which greatly reduces the influence of corrosive liquids on the sensor welds. Through the structural design of the special-shaped slot 203 and the elastic arc diaphragm 212, the cover plate 5 and the elastic sealing cover 6 will not have any influence on the force after welding.

[0038] The pressure-bearing rod 4 includes a first pressure-bearing rod 41 and a second pressure-bearing rod 42. The first pressure-bearing rod 41 is fixed between the force-bearing seat 1 and the shell 2, and the second pressure-bearing rod 42 is fixed between the shell 2 and the mounting seat 3. By setting the pressure-bearing rod 4, the pressure exerted on the force-bearing seat 1 can be transferred to the multi-beam pressure-bearing beam 21 for detecting the pressure value.

[0039] There are four elastic arc membranes 212 symmetrically distributed on both sides of the main beam 213 . Through the structural design of the special-shaped slots 203 and the elastic arc membranes 212 , the cover plate 5 and the elastic sealing cover 6 will not have any effect on the stress after welding.

[0040] A cable plug 31 is provided at the bottom of the mounting base 3. The cable plug 31 is fixedly connected to the mounting base 3. The strain gauge 7 is electrically connected to the cable plug 31. When in use, a data line plug is installed on the cable plug 31 to transmit the detected data.

[0041] The elastic sealing cover 6 is cylindrical, and one end of the elastic sealing cover 6 is closed, and the other end extends outward with a protruding edge. The elastic sealing cover 6 is installed on the circular slot 202, and the edge of the elastic sealing cover 6 is welded and fixed to the multi-beam pressure beam 21, and is sealed with the multi-beam pressure beam 21. The elastic sealing cover 6 is laser welded to the circular slot 202, so that the strain gauge 7 obtains the first seal.

[0042] There are two elastic sealing covers 6, which are respectively located on both sides of the main beam 213, and there is a gap between the elastic sealing cover 6 and the main beam 213. The edge width of the elastic sealing cover 6 is smaller than the thickness of the elastic arc membrane 212, so that after the elastic sealing cover 6 is installed, it will not affect the stress deformation of the main beam 213 and the elastic arc membrane 212, so that the measured value is accurate.

[0043] The outer wall of the pressure rod 4 and the opposite side surfaces of the force seat 1 and the mounting seat 3 all have a prismatic protrusion 201. Since the sensor is used for liquid measurement, the prismatic design of the prismatic protrusion 201 on the force seat 1, the shell 2, the mounting seat 3 and the pressure rod 4 allows the liquid to flow down without remaining on the sensor, thereby preventing long-term corrosion of the sensor.

[0044] A slot is provided on the shell 2 at the connection corresponding to the cover plate 5. The cover plate 5 is sealed and installed inside the slot. The cover plate 5 is welded and fixed to the shell 2. The cover plate 5 is laser welded to the side of the shell 2 so that the strain gauge 7 is sealed for the second time.

[0045] The working principle of the present invention is:

[0046] After the present invention is installed, when the force-bearing seat 1 receives a load, the force will be transmitted to the multi-beam pressure-bearing beam 21 through the elastic diaphragm 8, and a strain gauge 7 will be attached to the main beam 213. The stress on the main beam 213 will be measured by the strain gauge 7, thereby measuring the pressure value. The elastic sealing cover 6 is laser welded on the circular slot 202, so that the strain gauge 7 obtains a first seal, and the cover plate 5 is laser welded on the side of the shell 2, so that the strain gauge 7 obtains a second seal. Through the special design of the sensor structure, a double-layer protective structure is designed, which greatly reduces the influence of corrosive liquids on the sensor welds. Through the structural design of the special-shaped slot 203 and the elastic arc membrane 212, the cover plate 5 and the elastic sealing cover 6 will not have any influence on the force after welding.

[0047] The above embodiments are only for illustrating the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the present invention.

Claims

1. A weighing sensor with a double-layer sealing protection structure, comprising a force-bearing seat (1), a shell (2) and a mounting seat (3), characterized in that: A pressure-bearing rod (4) is provided between the force-bearing seat (1), the shell (2) and the mounting seat (3), and they are fixedly connected in sequence through the pressure-bearing rod (4); The shell (2) is provided with a multi-beam pressure-bearing beam (21) inside, the side walls at both ends of the shell (2) and one end of the pressure-bearing rod (4) are provided with elastic diaphragms (8), and cover plates (5) are embedded on both sides of the shell (2); The multi-beam pressure-bearing beam (21) comprises a symmetrically arranged beam seat (211), an elastic circular arc membrane (212), a main beam (213) and a side beam (214); the main beam (213) is fixed between the two beam seats (211); the side beams (214) are distributed on both sides of the main beam (213); and the side beams (214) are fixedly connected to the beam seat (211) via the elastic circular arc membrane (212); a strain gauge (7) is attached and fixed to the top of the main beam (213); circular slots (202) penetrating each other are provided on both sides of the main beam (213); elastic sealing covers (6) are fixedly installed at both ends of the circular slots (202); and a special-shaped slot (203) penetrating therethrough is provided on the side of the side beam (214); and the special-shaped slot (203) is located outside the circular slot (202).

2. The weighing sensor with a double-layer sealing protection structure according to claim 1, characterized in that: The shell (2) is a quadrangular prism, and the top and bottom of the shell (2) are both provided with prismatic protrusions (201).

3. The weighing sensor with a double-layer sealing protection structure according to claim 1, characterized in that: The pressure-bearing rod (4) comprises a first pressure-bearing rod (41) and a second pressure-bearing rod (42); the first pressure-bearing rod (41) is fixed between the force-bearing seat (1) and the shell (2); and the second pressure-bearing rod (42) is fixed between the shell (2) and the mounting seat (3).

4. The weighing sensor with a double-layer sealing protection structure according to claim 1, characterized in that: There are four elastic circular arc membranes (212), and the four elastic circular arc membranes (212) are symmetrically distributed on both sides of the main beam (213).

5. The weighing sensor with a double-layer sealing protection structure according to claim 1, characterized in that: A cable plug (31) is provided at the bottom of the mounting seat (3), the cable plug (31) is fixedly connected to the mounting seat (3), and the strain gauge (7) is connected to the cable plug (31) in a telecommunication manner.

6. The weighing sensor with a double-layer sealing protection structure according to claim 1, characterized in that: The elastic sealing cover (6) is cylindrical, and one end of the elastic sealing cover (6) close to the main beam (213) is closed, and the other end extends outward to form a protruding edge. The elastic sealing cover (6) is mounted on the circular slot (202), and the edge of the elastic sealing cover (6) is welded and fixed on the multi-beam pressure-bearing beam (21), and is sealed and connected to the multi-beam pressure-bearing beam (21).

7. The weighing sensor with a double-layer sealing protection structure according to claim 1, characterized in that: There are two elastic sealing covers (6), and the two elastic sealing covers (6) are respectively located on both sides of the main beam (213), and a gap is provided between one end of the elastic sealing cover (6) and the main beam (213).

8. The weighing sensor with a double-layer sealing protection structure according to claim 1, characterized in that: The width of the edge of the elastic sealing cover (6) is smaller than the thickness of the elastic arc membrane (212).

9. The weighing sensor with a double-layer sealing protection structure according to claim 1, characterized in that: The outer side wall of the pressure-bearing rod (4) and the opposite side surfaces of the force-bearing seat (1) and the mounting seat (3) all have prismatic protrusions (201).

10. The weighing sensor with a double-layer sealing protection structure according to claim 1, characterized in that: A slot is provided on the housing (2) at a connection point corresponding to the cover plate (5); the cover plate (5) is sealed and mounted inside the slot, and the cover plate (5) is fixed to the housing (2) by welding.

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