A ring-shaped force sensor

Abstract

This utility model relates to the field of sensor technology, specifically to a ring-shaped force sensor. It includes a flat plate, a ring body, a cover plate, and a T-shaped force-applying component. The ring body comprises an outer ring body and an inner ring body, with a strain beam between them. An upper annular groove and a lower annular groove are formed between the strain beam and the inner wall of the outer ring body. A strain gauge is installed at the bottom of the upper annular groove. The T-shaped force-applying component is installed within the inner ring body. The cover plate is positioned above the ring body, with a through hole in its center allowing the inner ring body to pass through. The outer ring of the cover plate is connected to the outer ring body, and a mounting groove is formed on the outer surface of the upper end of the outer ring body. This utility model, by uniformly attaching the strain gauge to the strain beam of the ring structure, can directly capture the maximum strain signal, reduce signal attenuation, improve the measurement signal-to-noise ratio, and thus enhance accuracy. The cover plate, through the use of screws, baffles, and other structures, facilitates disassembly and installation, providing convenience for sensor calibration, fault repair, or component replacement.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, specifically to a ring force sensor. Background Technology

[0002] With the rapid development of industrial automation, intelligent manufacturing, and precision measurement technologies, ring force sensors, due to their advantages such as compact structure, uniform force distribution, and high measurement accuracy, are widely used in fields such as robot grasping, precision assembly, and materials mechanics testing. In the structural design of ring force sensors, the ring-shaped metal cover plate, as a key component protecting the strain gauge 7 and isolating external interference, is usually fixed to the housing using argon arc welding or laser welding processes to ensure sealing performance and structural stability.

[0003] However, the technical contradictions brought about by this traditional welding method are becoming increasingly prominent: on the one hand, the high strength and permanence of the welded connection can effectively resist external impacts and prevent moisture and dust intrusion, meeting the long-term reliable operation requirements of the sensor under complex working conditions; on the other hand, the welded structure causes the annular metal cover to form an irreversible connection with the shell, which makes disassembly significantly difficult in scenarios such as sensor calibration, fault repair, and component replacement. At the same time, the strain gauge adopts the traditional "vertical pasting" (axial pasting) method. If the sensor is subjected to a composite load (such as the simultaneous presence of radial pressure and axial tension), the strain gauge cannot effectively capture the circumferential principal strain, resulting in output signal distortion and a serious decrease in measurement accuracy. Utility Model Content

[0004] This invention addresses the shortcomings of existing technologies by providing a ring-shaped force sensor. This solves the problems mentioned in the background section, such as the difficulty in disassembling the ring-shaped metal cover, which causes trouble for subsequent calibration and maintenance, and the decrease in measurement accuracy caused by the axial bonding of traditional strain gauges.

[0005] To achieve the above technical objectives, this utility model proposes the following technical solution: a ring-shaped force sensor, comprising a flat plate, a ring body, a cover plate, and a T-shaped force-applying component. The ring body includes an outer ring body and an inner ring body, with a strain beam provided between the outer and inner ring bodies. An upper annular groove and a lower annular groove are formed between the strain beam and the inner wall of the outer ring body. A strain gauge is installed at the bottom of the upper annular groove. The T-shaped force-applying component is installed inside the inner ring body. The cover plate is positioned above the ring body, with a through hole in the middle of the cover plate allowing the inner ring body to pass through. The outer ring of the cover plate is connected to the outer ring body. An installation groove is provided on the outer side of the upper end of the outer ring body. A baffle with a U-shaped structure and an opening facing downwards is provided on the outer side of the cover plate, with the top of the outer ring body positioned inside the opening of the baffle.

[0006] Furthermore, the outer wall of the baffle is evenly distributed with several countersunk holes, and screws are installed in the countersunk holes. The outer ring body is provided with threaded holes corresponding to the countersunk holes.

[0007] Furthermore, the top of the inner ring is provided with a first gasket, the bottom of the outer ring is provided with a second gasket, and one end of the T-shaped force-applying member passes through the first gasket, the inner ring, the second gasket, and the plate in sequence.

[0008] Furthermore, a sealing ring is provided on the outer ring of the inner ring, and the sealing ring abuts against the cover plate.

[0009] Furthermore, a sealing ring is fitted at the bottom of the mounting ring groove.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: By uniformly attaching strain gauges to the strain beam of the annular structure, this utility model can directly capture the maximum strain signal, reduce signal attenuation, improve the measurement signal-to-noise ratio, and thus improve accuracy; the cover plate, through the use of screws, baffles and other structures, can be easily disassembled and installed, providing convenience for sensor calibration, fault repair or component replacement, etc. At the same time, the use of sealing rings and sealing rings can improve the sealing effect of the upper annular groove, preventing dust, moisture and other substances from entering the upper annular groove and damaging the strain gauges inside the upper annular groove. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0012] Figure 2 This is a schematic diagram of the exploded ring structure of this utility model;

[0013] Figure 3 This is a schematic diagram of the ring structure of this utility model.

[0014] In the diagram, 1. Flat plate; 2. Ring body; 21. Outer ring body; 22. Inner ring body; 23. Strain beam; 24. Upper annular groove; 25. Lower annular groove; 26. Mounting ring groove; 3. Cover plate; 4. T-shaped force application component; 5. Strain gauge; 6. Through hole; 7. Baffle; 8. Countersunk hole; 9. Screw; 10. Threaded hole; 11. First gasket; 12. Second gasket; 13. Sealing ring; 14. Sealing ring. Detailed Implementation

[0015] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0016] This utility model provides a ring-shaped force sensor, including a plate 1, a ring body 2, a cover plate 3, and a T-shaped force-applying component 4. The ring body 2 includes an outer ring body 21 and an inner ring body 22. A strain beam 23 is provided between the outer ring body 21 and the inner ring body 22. An upper annular groove 24 and a lower annular groove 25 are formed between the strain beam 23 and the inner wall of the outer ring body 21. Multiple strain gauges 5 are installed at the bottom of the upper annular groove 24. The T-shaped force-applying component 4 is installed inside the inner ring body 22. The T-shaped force-applying component 4 can be a bolt. The cover plate 3 is located above the ring body 2, and an allowable inner opening is provided in the middle of the cover plate 3. The outer ring of the cover plate 3 is connected to the outer ring 21 through the through hole 6 of the ring body 22. The outer ring body 21 has an installation ring groove 26 on the outer side of its upper end. The cover plate 3 has a baffle 7 with a U-shaped structure with the opening facing downwards on its outer side. The top of the outer ring body 21 is set in the opening of the baffle 7. Several countersunk holes 8 are evenly distributed on the outer side wall of the baffle 7. Screws 9 are installed in the countersunk holes 8. The outer ring body 21 has a threaded hole 10 corresponding to the countersunk holes 8 on its outer side. The top of the outer ring body 21 is located in the opening of the baffle 7 and is fixed by screws 9 to prevent the cover plate 3 from falling off.

[0017] like Figure 1-3 As shown, in this embodiment, strain gauges 5 are evenly arranged circumferentially on strain beam 23. The strain gauges 5 are connected to form a measuring bridge. The cover plate 3 and the baffle plate 7 are integrally formed. The cover plate 3 covers the top of the ring body 2. During installation, the through hole 6 of the cover plate 3 is inserted into the inner ring body 22, while the top of the outer ring body 21 rests in the opening of the baffle plate 7. One end of the screw 9 passes through the countersunk hole 8 and is tightened into the threaded hole 10 of the outer ring body 21, so that the U-shaped structure of the baffle plate 7 clamps the top of the outer ring body 21, realizing the detachable fixation of the cover plate 3. The cover plate 3 is fixedly installed on the ring body 2, which can protect the strain gauges 7 in the upper annular groove 24. A groove is formed between the upper cover surface of the cover plate 3 and the baffle plate 7. This prevents the T-shaped force-applying component 4 from touching the cover plate 3 when applying force to the inner ring 22, thus improving measurement accuracy. The T-shaped force-applying component 4 bears external force and applies it to the inner ring 22, causing the strain beam 23 to undergo slight deformation. The strain gauges 5 attached to the strain beam 23 sense the strain value with the same effect. According to the working principle of the Wheatstone bridge, multiple strain gauges 5 are connected together, and the voltage signal changes accordingly based on the magnitude of the force. When the sensor is subjected to radial or axial load, the strain beam 23 undergoes circumferential deformation. The strain gauges 5 attached to the strain beam 23 can directly capture the maximum strain signal, reduce signal attenuation, improve the measurement signal-to-noise ratio, and thus improve accuracy.

[0018] The top of the inner ring 22 is provided with a first gasket 11, and the bottom of the outer ring 21 is provided with a second gasket 12. One end of the T-shaped force-applying member 4 passes through the first gasket 11, the inner ring 22, the second gasket 12 and the plate 1 in sequence.

[0019] like Figure 1As shown, the function of the first gasket 11 and the second gasket 12 is to prevent the T-shaped force-applying component 4 from directly pressing the inner ring 22 and the surface of the plate 1, to distribute the pressure to a larger area, to protect the contact surface, and to prevent damage to the components due to stress concentration; at the same time, it fills the small unevenness of the contact surface, making the connection of the T-shaped force-applying component 4 more stable, making the ring sensor more uniformly stressed, and improving the reliability and measurement accuracy of the entire connection structure.

[0020] A sealing ring 13 is fixedly installed on the outer ring of the inner ring body 22, and the sealing ring 13 abuts against the cover plate 3.

[0021] like Figure 1 As shown, the sealing ring 13 abuts against the bottom plane of the cover plate 3 to achieve a sealing effect, which can prevent dust, moisture and other substances from entering the upper annular groove 24 and damaging the strain gauge 7 inside the upper annular groove 24.

[0022] A sealing ring 14 is fitted at the bottom of the mounting ring groove 26.

[0023] like Figure 2 As shown, the sealing ring 14 can fit the joint between the baffle 7 and the mounting ring groove 26, thus sealing it and further protecting the strain element.

[0024] Operating principle: When installing the cover plate 3, first put the sealing ring 14 on the mounting ring groove 26, insert the through hole 6 of the cover plate 3 into the inner ring body 22, and at the same time make the top of the outer ring body 21 fall into the opening of the baffle 7. Then rotate the cover plate 3 so that the countersunk hole 8 corresponds to the threaded hole 10. Insert the screw 9 into the countersunk hole 8, and use a screwdriver to turn the screw 9 to fix the screw 9 to the outer ring body 21. When it is necessary to calibrate the sensor, repair the fault or replace the component, the cover plate 3 can be removed by using a screwdriver to unscrew the screw 9, so that the strain gauge 7 in the upper annular groove 24 can be exposed, which is convenient for the staff to operate. After calibration or repair, the cover plate 3 can be installed on the ring body 2 according to the installation method.

[0025] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A ring force transducer, characterized by: The device includes a flat plate (1), a ring body (2), a cover plate (3), and a T-shaped force-applying component (4). The ring body (2) includes an outer ring body (21) and an inner ring body (22). A strain beam (23) is provided between the outer ring body (21) and the inner ring body (22). An upper annular groove (24) and a lower annular groove (25) are formed between the strain beam (23) and the inner wall of the outer ring body (21). A strain gauge (5) is installed at the bottom of the upper annular groove (24). The T-shaped force-applying component (4) Installed inside the inner ring (22), the cover plate (3) is set above the ring (2), and the middle of the cover plate (3) is provided with a through hole (6) that allows the inner ring to pass through. The outer ring of the cover plate (3) is connected to the outer ring (21). The outer ring (21) is provided with an installation ring groove (26) on the outside of the upper end. The cover plate (3) is provided with a baffle (7) with a U-shaped structure with the opening facing downward. The top of the outer ring (21) is set in the opening of the baffle (7).

2. A ring force transducer according to claim 1, wherein: The outer wall of the baffle (7) has a number of countersunk holes (8) evenly distributed. Screws (9) are provided in the countersunk holes (8). The outer ring (21) has threaded holes (10) corresponding to the countersunk holes (8) on its outer side.

3. A ring force transducer according to claim 1, wherein: The top of the inner ring (22) is provided with a first gasket (11), and the bottom of the outer ring (21) is provided with a second gasket (12). One end of the T-shaped force-applying member (4) passes through the first gasket (11), the inner ring (22), the second gasket (12) and the plate (1) in sequence.

4. A ring force transducer according to claim 1, wherein: The inner ring (22) has a sealing ring (13) on its outer ring, and the sealing ring (13) abuts against the cover plate (3).

5. A ring-shaped force sensor according to claim 1, characterized in that: A sealing ring (14) is fitted at the bottom of the mounting groove (26).

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