Hollow toroidal pressure sensor

Abstract

The utility model discloses a hollow circular ring formula pressure sensor relates to pressure sensor technical field, including circular ring main part, and the outer wall of circular ring main part is provided with deformation space, and the inside of deformation space is equipped with elastomer, and the top and bottom of elastomer are contacted with the inner wall of deformation space respectively, and the periphery side of elastomer is equipped with multiple strain gauges, and the resistance of strain gauge changes along with the deformation of elastomer, and when the pressure action point deviates from the center of circular ring main part, the deformation space deformation variable of partial side increases, and the deformation space deformation variable of symmetry with it reduces, and multiple strain gauges will synchronously gather the strain signal of respective pasting elastomer at this moment, and the signal processing module of outside will eliminate the local deformation difference caused by eccentric load through symmetric strain difference value compensation algorithm.

Description

Technical Field

[0001] This utility model relates to the field of pressure sensor technology, and in particular to a hollow ring pressure sensor. Background Technology

[0002] Hollow large-ring pressure sensor is a sensor with a special structure. This structure has one or more columns inside the ring as force support. Strain gauges are attached to a local area on the surface of the columns or the inner wall of the ring. Its annular hollow structure gives it unique advantages in specific scenarios. In stamping equipment, the sensor captures the pressure peak and distribution in real time during the stamping process, helping to accurately control the stamping pressure and avoid material overload or breakage.

[0003] Previously, the hollow large-ring pressure sensor on the stamping equipment had a column structure inside. Due to the wide distribution of the supporting columns, the strain could not be effectively concentrated. As a result, when localized stress occurred, the strain gauge could not accurately capture the strain signal. The lack of strain concentration led to weak signal and poor linearity. Especially under off-center or overload conditions, the feedback force value error was large. When the pressure application point was off-center, the column structure could not uniformly transmit stress, further reducing the measurement accuracy.

[0004] To address the above shortcomings, it is necessary to further improve the existing circular pressure sensor to improve the situation where the strain of the circular pressure sensor cannot be effectively concentrated, resulting in the inability to accurately capture the strain signal at the location of the strain gauge when subjected to localized stress. Utility Model Content

[0005] This invention addresses the issue that the strain gauge location in a circular pressure sensor cannot accurately capture strain signals.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a hollow ring-type pressure sensor, comprising a ring body, a deformation space formed on the outer wall of the ring body, an elastic body disposed inside the deformation space, the top and bottom of the elastic body respectively contacting the inner wall of the deformation space, and a plurality of strain gauges disposed on the outer periphery of the elastic body, the resistance of the strain gauges changing with the deformation of the elastic body.

[0007] As a further embodiment of this utility model: the circular body includes an upper ring body and a lower ring body. The bottom of the upper ring body is provided with a plurality of first sink grooves, and the top of the lower ring body is provided with a plurality of second sink grooves. The elastic body is fixedly connected to the first sink grooves and the second sink grooves. When the upper ring body and the lower ring body are connected, the first sink grooves and the second sink grooves combine to form a deformation space.

[0008] As a further embodiment of this utility model: the circular body is provided with multiple through holes, and the inner walls on both sides of the deformation space are provided with anti-overload grooves, which are connected to the adjacent through holes.

[0009] As a further embodiment of this utility model: there are multiple deformation spaces, which are distributed at intervals along the outer circumference of the circular body, and are symmetrically distributed. The multiple through holes are respectively opened at positions adjacent to the sidewalls of the deformation spaces.

[0010] As a further embodiment of this utility model: the elastic body is annular, and a plurality of strain gauges are distributed at intervals along the outer circumference of the elastic body.

[0011] As a further embodiment of this utility model: a movable gap is provided between the upper ring body and the lower ring body, and the upper ring body can move up and down through the movable gap, so that the elastic body deforms with the movement of the upper ring body.

[0012] As a further embodiment of this utility model: the diameter of the upper ring body is larger than that of the lower ring body, the side of the upper ring body away from the lower ring body is the force-bearing surface, and the side of the lower ring body away from the upper ring body is the mounting surface.

[0013] As a further embodiment of this utility model: a protective cover is detachably connected to the lower part of the upper ring body, the inner wall diameter of the protective cover is larger than the diameter of the lower ring body, and the mounting surface of the lower ring body is exposed on the surface of the protective cover.

[0014] As a further embodiment of this utility model: there are six deformation spaces, which are distributed at intervals along the outer circumference of the ring body, and are symmetrically distributed. The ring body and the elastic body are made of stainless steel.

[0015] As a further embodiment of this utility model: the overload protection groove is a U-shaped groove, and the thickness of the main body of the ring is 50mm-70mm.

[0016] Compared with the existing technology, the beneficial effects of this technical solution are as follows: when the pressure application point deviates from the center of the ring body, the deformation of the deformation space on the biased side increases, while the deformation of the symmetrical deformation space decreases. At this time, multiple strain gauges will synchronously collect the strain signals of their respective attached elastic bodies, and the external signal processing module will eliminate the local deformation difference caused by the off-center loading through the symmetrical strain difference compensation algorithm.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram illustrating the separation effect of the protective cover and the upper ring body of this utility model; Figure 3 This is a schematic diagram of the elastic body deformation effect of this utility model; Figure 4 This is a schematic diagram illustrating the elastomer recovery effect of this utility model; Figure 5 This is a bottom view of the overall structure of this utility model; Figure 6 yes Figure 5 Schematic diagram of the cross section at point AA; Figure 7 This is a schematic diagram illustrating the conductive effect of the anti-overload groove and through hole in this utility model. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-7 A hollow ring-type pressure sensor includes a ring body 1 made of stainless steel with a thickness of 60 mm, comprising an upper ring body 12 and a lower ring body 13; the diameter of the upper ring body 12 is larger than that of the lower ring body 13, the top surface of the upper ring body 12 is the force-bearing surface, which is used to withstand the pressure of the stamping equipment, and the bottom surface of the lower ring body 13 is the mounting surface. A plurality of strain gauges 3 are provided on the outer periphery of the elastic body 2, and the resistance of the strain gauges 3 changes with the deformation of the elastic body 2.

[0022] A movable gap 16, 0.5mm-1mm wide, is provided between the upper ring 12 and the lower ring 13 to ensure that the upper ring 12 can move up and down relative to the lower ring 13. Six first grooves 121 are evenly distributed along the outer circumference of the bottom of the upper ring 12, and six second grooves 131 are correspondingly distributed on the top of the lower ring 13. When the upper ring 12 and the lower ring 13 are connected, the first grooves 121 and the second grooves 131 combine to form six deformation spaces 11. These six deformation spaces 11 are symmetrically distributed along the outer circumference of the main ring 1. When the pressure point deviates from the center of the main ring, the deformation on the deviated side... As the spatial deformation increases, the corresponding deformation space deformation decreases. The increased deformation will cause the deformation space to compress the elastic body, resulting in a larger deformation. Similarly, the compression of the elastic body by the deformation space with a smaller deformation will result in a smaller deformation. At this time, multiple strain gauges 3 will synchronously collect the strain signals of their respective attached elastic bodies. The external signal processing module will use a symmetrical strain difference compensation algorithm to eliminate the local deformation difference caused by off-center loading, ensuring that the error between the output pressure value and the actual pressure is ≤ ±0.3%FS, and avoiding measurement inaccuracies caused by off-center loading.

[0023] Each deformation space 11 is provided with a ring-shaped elastic body 2. The elastic body 2 is made of stainless steel. Its top end is integrally formed with the inner wall of the first sink 121, and its bottom end is integrally formed with the inner wall of the second sink 131. The elastic body 2 is fixedly connected to the first sink 121 and the second sink 131 respectively. This makes the upper ring body 12 and the lower ring body 13 relatively fixed, so that the first sink 121 and the second sink 131 can form a deformation space 11. Multiple strain gauges 3 are attached to the outer arc surface of the elastic body 2. The lead wires of the strain gauges 3 are connected to the external signal processing circuit through the pre-set wire holes of the ring body 1.

[0024] The main body 1 of the ring is also provided with 12 through holes 14, which are located in pairs between the side walls of two adjacent deformation spaces 11 for weight reduction and auxiliary installation. Each deformation space 11 has a U-shaped anti-overload groove 15 on both inner walls. One end of the anti-overload groove 15 is connected to the adjacent through hole 14, and the other end extends to the inner wall of the deformation space 11. When overloaded, the anti-overload groove 15 will undergo a slight deformation to absorb some stress. Specifically, the U-shaped anti-overload groove 15 is connected to the adjacent mounting hole 14. The mounting hole 14 is a 12×M12 threaded mounting hole, which is equidistantly distributed along the 360° circumference of the main body 1 of the ring. When the external pressure is accidentally concentrated at a single point of the ring, the pressure first acts on the groove wall of the U-shaped anti-overload groove 15 corresponding to that point. The groove wall of the anti-overload groove will disperse part of the concentrated force at the single point to the adjacent mounting hole 14.

[0025] A protective cover 122 is detachably connected to the lower part of the upper ring 12 by bolts. The protective cover 122 is circular, and the inner diameter is larger than the diameter of the lower ring 13. The mounting surface of the lower ring 13 is exposed on the bottom surface of the protective cover 122, which does not affect the installation and can prevent external dust and debris from entering the deformation space 11.

[0026] Working process: When the pressure of the stamping equipment is applied to the force-bearing surface of the upper ring 12, the upper ring 12 moves downward relative to the lower ring 13 through the movable gap 16, compressing the elastic body 2 in the deformation space 11. The elastic body 2 undergoes bending deformation, which drives the strain gauge 3 on the outer periphery to generate strain. The resistance of the strain gauge 3 changes with the deformation. The external signal processing circuit calculates the pressure value by detecting the change in resistance. When the pressure is off-center, the deformation difference of the symmetrically distributed elastic body 2 is captured by the signal difference of the corresponding strain gauge 3. After circuit compensation, the off-center load error is reduced. When the pressure is overloaded, the overload protection groove 15 undergoes a small deformation to absorb stress and avoid excessive deformation and damage to the elastic body 2.

[0027] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A hollow ring-type pressure sensor, characterized in that, The device includes a circular ring body (1), the outer wall of which has a deformation space (11), and an elastic body (2) is provided inside the deformation space (11). The top and bottom of the elastic body (2) are in contact with the inner wall of the deformation space (11), and a plurality of strain gauges (3) are provided on the outer periphery of the elastic body (2). The resistance of the strain gauges (3) changes with the deformation of the elastic body (2).

2. The hollow ring pressure sensor according to claim 1, characterized in that, The circular body (1) includes an upper ring body (12) and a lower ring body (13). The bottom of the upper ring body (12) is provided with a plurality of first grooves (121), and the top of the lower ring body (13) is provided with a plurality of second grooves (131). The elastic body (2) is fixedly connected to the first grooves (121) and the second grooves (131) respectively, so that the upper ring body (12) and the lower ring body (13) are relatively fixed. When the upper ring body (12) and the lower ring body (13) are connected, the first grooves (121) and the second grooves (131) combine to form a deformation space (11).

3. The hollow ring pressure sensor according to claim 1, characterized in that, The circular body (1) has multiple through holes (14), and the inner walls on both sides of the deformation space (11) are provided with anti-overload grooves (15), which are connected to the adjacent through holes (14).

4. The hollow ring pressure sensor according to claim 3, characterized in that, There are multiple deformation spaces (11), which are distributed at intervals along the outer periphery of the annular body (1). The multiple deformation spaces (11) are symmetrically distributed, and the multiple through holes (14) are respectively opened at positions adjacent to the sidewalls of the deformation spaces (11).

5. The hollow ring pressure sensor according to claim 1, characterized in that, The elastic body (2) is annular, and a plurality of strain gauges (3) are distributed at intervals along the outer periphery of the elastic body (2).

6. The hollow ring pressure sensor according to claim 2, characterized in that, A movable gap (16) is provided between the upper ring body (12) and the lower ring body (13). The upper ring body (12) can move up and down through the movable gap (16), so that the elastic body (2) moves and deforms with the upper ring body (12).

7. The hollow ring pressure sensor according to claim 2, characterized in that, The diameter of the upper ring (12) is larger than that of the lower ring (13). The side of the upper ring (12) away from the lower ring (13) is the force-bearing surface, and the side of the lower ring (13) away from the upper ring (12) is the mounting surface.

8. The hollow ring pressure sensor according to claim 7, characterized in that, A protective cover (122) is detachably connected to the lower part of the upper ring (12). The inner diameter of the protective cover (122) is larger than the diameter of the lower ring (13). The mounting surface of the lower ring (13) is exposed on the surface of the protective cover (122).

9. The hollow ring pressure sensor according to claim 1, characterized in that, There are six deformation spaces (11), which are distributed at intervals along the outer periphery of the annular body (1). The six deformation spaces (11) are symmetrically distributed. The annular body (1) and the elastic body (2) are made of stainless steel.

10. The hollow ring pressure sensor according to claim 3, characterized in that, The overload protection groove (15) is a U-shaped groove, and the thickness of the circular body (1) is 50mm-70mm.

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