Cylindrical three-shear-beam force sensor

Abstract

The utility model discloses a cylindrical three-shear-beam force sensor, and belongs to the technical field of sensors. The device mainly comprises a housing; the induction part is mounted in the cover shell, and the induction part comprises an elastic body mounted in the cover shell; the three shear beams are mounted at the upper end and the lower end of the elastic body; the stress end is mounted at the upper ends of the three shear beams; the fixed end is mounted at the lower ends of the three shear beams, and the fixed end and the stress end are manufactured in the same thickness; and the strain gauges are arranged on the inner side and the outer side of the three shear beams. According to the cylindrical three-shear-beam force sensor, the three shear beams are arranged, so that the effects that the unbalance loading resistance and the bending moment resistance are good in the measurement process, and the measurement precision is improved are achieved.

Description

Technical Field

[0001] This application relates to the technical field of sensors, and specifically to a cylindrical three-shear beam force sensor. Background Art

[0002] A cylindrical tension-compression bidirectional sensor is a device that converts mechanical stress (tensile or compressive force) into an electrical signal output, and is widely used in fields such as industrial automation, weighing systems, and tensile testing.

[0003] The cylindrical tension-compression bidirectional sensor utilizes the cross-section of a cylinder or a ring to be deformed under force, senses this deformation through internal strain gauges or other sensitive elements, and converts it into an electrical signal for output. This electrical signal is usually proportional to the applied tensile or compressive force, thereby achieving precise measurement of force.

[0004] However, in actual use, when the cylindrical tension-compression bidirectional sensor may be subjected to forces perpendicular to its axis direction (lateral forces), these forces will generate bending moments inside the sensor, and thus these bending moments result in low measurement accuracy.

[0005] Therefore, it is necessary to provide a cylindrical three-shear beam force sensor to solve the above problems.

[0006] It should be noted that the above information disclosed in this background art section is only used to understand the background art of the concept of this application, and therefore, it may include information that does not constitute prior art. Summary of the Invention

[0007] Based on the above problems existing in the prior art, the problem to be solved by this application is: to provide a cylindrical three-shear beam force sensor, which solves the problem of low measurement accuracy caused by the generation of bending moments during the measurement process.

[0008] The technical solution adopted by this application to solve its technical problems is: a cylindrical three-shear beam force sensor, comprising:

[0009] A housing;

[0010] An induction part, which is installed inside the housing. The induction part is used to sense the force or pressure applied to the sensor and thus change. The induction part includes:

[0011] An elastomer, which is installed inside the housing;

[0012] A three-shear beam, which is installed at the upper and lower ends of the elastomer;

[0013] A force-receiving end, which is installed at the upper end of the three-shear beam;

[0014] A fixed end, which is installed at the lower end of the three-shear beam, and the fixed end and the force-bearing end are made of the same thickness;

[0015] The strain gauge is installed on the inner and outer sides of the three shear beams.

[0016] Furthermore, an upper cover plate is fixedly provided at the upper end of the cover shell, a lower cover plate is fixedly provided at the lower end of the cover shell, and sealing rings are fixedly provided at the connection between the upper cover plate, the lower cover plate and the cover shell.

[0017] Furthermore, the three shear beams are fixedly arranged at a middle position between the fixed end and the force-bearing end, and a gap is formed at the connection between the fixed end, the force-bearing end and the three shear beams.

[0018] Furthermore, a threaded hole is provided on the force-bearing end, a force-bearing thread is provided inside the threaded hole, and a threaded hole is provided at the bottom of the fixed end.

[0019] Furthermore, a junction box is fixedly provided on the outer side of the cover shell, and an aviation plug is fixedly provided on one end of the junction box.

[0020] Furthermore, a locking gasket is fixedly arranged on the force-bearing end.

[0021] The beneficial effect of the present application is that a cylindrical three-shear beam force sensor provided by the present application achieves good resistance to off-center loads and bending moments during the measurement process by setting up three shear beams, thereby improving the measurement accuracy.

[0022] In addition to the above-described purposes, features and advantages, the present application also has other purposes, features and advantages. The present application will be further described in detail with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0024] Figure 1 It is an overall schematic diagram of a cylindrical three-shear beam force sensor in this application;

[0025] Figure 2 It is an exploded schematic diagram of a cylindrical three-shear beam force sensor in this application;

[0026] Figure 3 for Figure 2 Schematic diagram of the explosion of the middle induction unit;

[0027] Figure 4 is a schematic diagram of an elastic body;

[0028] Among them, each reference numeral in the figure:

[0029] 1. Sensor; 2. Housing; 3. Junction box; 4. Aviation plug; 5. Upper cover plate; 6. Sealing ring; 8. Lower cover plate; 9. Induction part; 90. Force-receiving end; 92. Fixed end; 91. Shear beam; 93. Strain gauge; 94. Elastomer; 10. Locking gasket. Detailed implementation manners

[0030] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will describe the present application in detail with reference to the drawings and in combination with the embodiments.

[0031] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0032] As Figure 1 - Figure 2 shown, the present application provides a cylindrical three-shear beam force sensor, including a sensor 1, which is used to detect and measure the thread pre-tightening force by using the force or pressure change applied to the sensor 1, and convert it into a measurable electrical signal for output;

[0033] The sensor 1 includes a housing 2, which is used to protect the sensor 1 and other internal components, prevent external dust, moisture and other impurities from damaging the sensor 1. At the same time, an upper cover plate 5 is fixedly arranged at the upper end of the housing 2, which is used to fix the housing 2, seal the internal space or provide additional support. And a lower cover plate 8 is fixedly arranged at the lower end of the housing 2. The upper cover plate 5 and the lower cover plate 8 together form a closed space to protect the internal components of the housing 2 from the outside;

[0034] And a sealing ring 6 is fixedly arranged at the connection between the upper cover plate 5 and the lower cover plate 8 and the housing 2. The sealing ring 6 further prevents external liquids, gases or impurities from infiltrating into the device, and ensures the normal operation of the sensor 1 and other components;

[0035] As Figure 1 and Figure 3 - Figure 4As shown, an induction part 9 is fixedly arranged inside the housing 2. The induction part 9 is used to sense the force or pressure applied to the sensor 1 and thus change. The induction part 9 includes an elastomer 94 fixedly arranged inside the housing 2. At the upper and lower ends of the elastomer 94, three-shear beams 91 are fixedly arranged. The three-shear beams 91 are used to undergo minute deformation when subjected to an external force. Thus, this deformation will be sensed by the sensor 1 and converted into an electrical signal for output;

[0036] At the same time, a force-receiving end 90 is fixedly arranged at the upper end of the three-shear beam 91. The force-receiving end 90 will be closely connected to the three-shear beam 91 so as to transfer the external force to the three-shear beam 91 and then be sensed and measured by the sensor 1;

[0037] And a threaded hole is provided on the force-receiving end 90. A force-receiving thread is arranged inside the threaded hole. The force-receiving thread is used to connect with an external auxiliary test component, bear the tensile force or pressure from above, and at the same time transfer the external acting force to the three-shear beam 91 inside the sensor 1 to achieve the purpose of detecting the pre-tightening force of the thread;

[0038] At the same time, a fixed end 92 is fixedly arranged at the lower end of the three-shear beam 91. And a threaded hole (not shown in the figure) is provided at the bottom of the fixed end 92. The fixed end 92 is used to connect with an external auxiliary test component by using the threaded hole;

[0039] It should be noted that the fixed end 92 and the force-receiving end 90 are manufactured with the same thickness. At the same time, the three-shear beam 91 is fixedly arranged at the middle position between the fixed end 92 and the force-receiving end 90;

[0040] And the fixed end 92 and the force-receiving end 90 are closely connected to the three-shear beam 91, so that the aspect ratio is less than 0.01 and the precision can reach within two-thousandths. Furthermore, in the case of a relatively short height and shape, it can achieve advantages such as good anti-off-axis load and anti-bending moment performance, high precision, and high safety factor;

[0041] At the same time, a strain gauge 93 is attached to the three-shear beam 91. The strain gauge 93 converts the deformation of the three-shear beam 91 into an electrical signal. When the three-shear beam 91 is deformed under the action of an external force, the resistance value of the strain gauge 93 will change. This change can be converted into a measurable voltage or current signal for output through a circuit;

[0042] The strain gauge 93 adopts an internal and external pasting method and is pasted at the thinnest part of the wall thickness of the elastomer 94. At the same time, the internal and external strains are measured, which can more accurately reflect the overall deformation state of the structure, thereby improving the measurement accuracy;

[0043] Meanwhile, in order to improve the detection accuracy, a locking gasket 10 is fixedly arranged on the force receiving end 90, so that the force receiving end 90 will not loosen or move during the working process. The locking gasket 10 provides additional fastening force and stability, which helps to maintain the overall performance and accuracy of the sensor 1;

[0044] And at the same time, a junction box 3 is fixedly arranged on the outer side of the housing 2. One end of the junction box 3 is fixedly provided with a aviation plug 4, and the aviation plug 4 connects the junction box 3 with other external detection devices to ensure stable and reliable communication or data transmission;

[0045] When testing the thread pre-tightening force, the triple shear beam 91 is the main strain structure of the sensor 1. The bottom fixed end 92 of the sensor 1 is fixed to the outside through the bottom thread hole, and at the same time, the force receiving end 90 is connected to the external bolt through the force receiving thread. When the bolt is tightened and the force receiving end 90 is loaded with a load, it will cause the structure of the triple shear beam 91 to deform. At this time, the strain gauge 93 on the triple shear beam 91 will receive the shear force and thus sense this deformation, and generate a corresponding resistance change. This change can be converted into a measurable voltage or current signal through the circuit and output to the external detection device through the aviation plug 4.

[0046] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A cylindrical triple shear beam force sensor, characterized in that: include: Cover (2); A sensing part (9), the sensing part (9) being installed inside the housing (2), the sensing part (9) being used to sense the force or pressure applied to the sensor (1) and thereby causing a change, the sensing part (9) comprising: an elastic body (94), the elastic body (94) being installed inside the cover shell (2); Three shear beams (91), the three shear beams (91) being mounted at the upper and lower ends of the elastic body (94); A force-bearing end (90), the force-bearing end (90) being mounted on the upper end of the three shear beams (91); A fixed end (92), the fixed end (92) being mounted on the lower end of the three-shear beam (91), the fixed end (92) and the force-bearing end (90) being manufactured with the same thickness; A strain gauge (93) is installed on both inner and outer sides of the three shear beams (91).

2. A cylindrical triple shear beam force sensor according to claim 1, characterized in that: An upper cover plate (5) is fixedly provided at the upper end of the cover shell (2), a lower cover plate (8) is fixedly provided at the lower end of the cover shell (2), and a sealing ring (6) is fixedly provided at the connection between the upper cover plate (5), the lower cover plate (8) and the cover shell (2).

3. A cylindrical triple shear beam force sensor according to claim 1, characterized in that: The three shear beams (91) are fixedly arranged at a position between the fixed end (92) and the force-bearing end (90), and a gap is formed at the connection between the fixed end (92), the force-bearing end (90) and the three shear beams (91).

4. A cylindrical triple shear beam force sensor according to claim 1, characterized in that: A threaded hole is provided on the force-bearing end (90), a force-bearing thread is provided inside the threaded hole, and a threaded hole is provided at the bottom of the fixed end (92).

5. The cylindrical triple shear beam force sensor according to claim 1, characterized in that: A junction box (3) is fixedly disposed on the outer side of the cover shell (2), and an aviation plug (4) is fixedly disposed on one end of the junction box (3).

6. A cylindrical triple shear beam force sensor according to claim 1, characterized in that: A locking gasket (10) is fixedly arranged on the force-bearing end (90).

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