Tension sensor

Abstract

The utility model relates to the technical field of tension sensors, in particular to a tension sensor, which comprises a shell, an installation cavity is arranged in the shell, an induction structure is arranged in the installation cavity of the shell and comprises a main inner core, and the main inner core comprises a first induction inner core and a second induction inner core which are symmetrically arranged. One end of the first induction inner core is connected with the third induction inner core, one end of the second induction inner core is connected with the fourth induction inner core, the first induction inner core, the second induction inner core, the third induction inner core and the fourth induction inner core are all sleeved with first coils, and a connecting ring is arranged between the first induction inner core and the second induction inner core. An auxiliary inner core is arranged in the connecting ring, and a second coil is arranged outside the auxiliary inner core in a sleeving mode. Therefore, the sensor can quickly sense the magnitude and state of stress, is convenient to install, can detect in a circumferential range, and is wide in application range and high in sensitivity and detection precision.

Description

Technical Field

[0001] The utility model relates to the technical field of tension sensors, in particular to a tension sensor. Background Art

[0002] A tension sensor is a device that converts physical signals into measurable electrical signal outputs. In the resistance detection of tractors, force sensors are usually required.

[0003] At present, the existing tension sensor, such as the Chinese patent with announcement number CN218330354U, discloses a bidirectional tension sensor, including a tension sensor body and two pull ring mechanisms, the left and right sides of the tension sensor body are both provided with U-shaped cavities, the two U-shaped cavities are staggered, the top surface and the bottom surface of the tension sensor body are both provided with threaded holes, each of the threaded holes is communicated with the corresponding U-shaped cavity, each of the threaded holes is matched and connected with the corresponding pull ring mechanism, each of the pull ring mechanisms includes a connecting screw, each of the connecting screws is threadedly connected with the corresponding threaded hole, one end of each connecting screw is fixed with a connecting round block, the other end of each connecting screw is threadedly sleeved with a locking nut, each of the locking nut is matched and pressed against the inner wall of the corresponding U-shaped cavity, and a matching positioning component is provided between each connecting screw and the tension sensor body, which is convenient for installation and disassembly, but the sensitivity of the above device is poor, and the volume is large, which is inconvenient to use.

[0004] How to quickly sense the size and state of force, make installation easy, detect within a circular range, have a wide range of applications, and have high sensitivity and detection accuracy has become a technical problem that needs to be broken through.

[0005] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0006] In view of the above-mentioned defects, the purpose of the utility model is to provide a tension sensor, which has a simple structure, is easy to use, can quickly sense the size and state of force, is easy to install, can detect within a circular range, has a wide range of applications, and has high sensitivity and detection accuracy.

[0007] In order to achieve the above-mentioned object, the utility model provides a tension sensor, comprising a shell, a mounting cavity is provided inside the shell, and a sensing structure is provided inside the mounting cavity of the shell.

[0008] The induction structure includes a secondary inner core, a connecting ring is sleeved on the outside of the secondary inner core, a second coil is arranged between the secondary inner core and the connecting ring, the connecting ring connects a first induction inner core, a second induction inner core, a third induction inner core and a fourth induction inner core, and the first induction inner core, the second induction inner core, the third induction inner core and the fourth induction inner core are all sleeved on the outside with a first coil.

[0009] According to the tension sensor of the utility model, the energization directions of the first coil on the first induction inner core and the first coil on the second induction inner core are opposite, the energization directions of the first coil on the third induction inner core and the first coil on the fourth induction inner core are opposite, and the energization directions of the first coil on the first induction inner core and the first coil on the third induction inner core are the same.

[0010] According to the tension sensor of the utility model, a groove is provided on the outside of the shell at the sensing structure.

[0011] According to the tension sensor of the utility model, the inner side walls of the groove are perpendicular to the housing.

[0012] According to the tension sensor of the utility model, the inner side walls of the groove are all inclined.

[0013] According to the tension sensor of the utility model, the shell is a cylindrical structure.

[0014] According to the tension sensor of the utility model, the secondary inner core is perpendicular to the main inner core.

[0015] The purpose of the utility model is to provide a tension sensor, including a sensing structure. When the outer part of the shell is subjected to a force along the radial direction of the shell, the load will be transferred to the shell. The sensing structure can sense the state of the force and output a voltage signal, so that the operator can monitor the tension at this place. A groove is provided on the outer part of the shell at the sensing structure. The groove can provide a variable cross-section area for the shell, reduce the rigidity of the shell in this area, increase the deformation of the shell after being subjected to force, increase the internal stress, increase the difference in magnetic permeability in different areas of the shell, and increase the output voltage under the same force condition, thereby improving the sensitivity. In summary, the beneficial effects of the utility model are: it can quickly sense the size and state of the force, is easy to install, and can be detected within a circumferential range, has a wide range of applications, and has high sensitivity and detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Figure 2 is a longitudinal section view of the interior of the housing;

[0018] Figure 3 is a structural diagram of the sensing structure;

[0019] Figure 4 is a structural diagram of Example 2;

[0020] In the figure: 1-housing, 11-groove, 12-installation cavity, 2-induction structure, 21-main inner core, 211-first induction inner core, 212-second induction inner core, 213-third induction inner core, 214-fourth induction inner core, 22-first coil, 23-connecting ring, 24-auxiliary inner core, 241-second coil. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0022] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", "top / bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "sleeved / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0024] See also Figure 1 to Figure 3 The utility model provides a tension sensor, including a shell 1, the shell 1 is a cylindrical structure, a mounting cavity 12 is arranged inside the shell 1, and a sensing structure 2 for sensing tension is arranged inside the mounting cavity 12 of the shell 1.

[0025] See also Figure 1 to Figure 3The induction structure 2 includes a main inner core 21, which includes a first induction inner core 211 and a second induction inner core 212 that are symmetrically arranged. One end of the first induction inner core 211 is connected to the third induction inner core 213, and one end of the second induction inner core 212 is connected to the fourth induction inner core 214. The third induction inner core 213 and the fourth induction inner core 214 are symmetrically arranged. The first induction inner core 211, the second induction inner core 212, the third induction inner core 213 and the fourth induction inner core 214 are all sleeved with a first coil 22. A connecting ring 23 (connecting the first induction inner core 211 and the second induction inner core 212) is arranged between the first induction inner core 211 and the second induction inner core 212. The material of the ring 23 is the same as that of the main inner core 21), the connecting ring 23 connects the first inductive inner core 211, the second inductive inner core 212, the third inductive inner core 213 and the fourth inductive inner core 214, and the connecting ring 23 connects the first inductive inner core 211, the second inductive inner core 212, the third inductive inner core 213 and the fourth inductive inner core 214 into a whole. The interior of the connecting ring 23 is hollow, and a sub-core 24 is arranged inside the connecting ring 23 (the sub-core 24 is arranged perpendicular to the main inner core 21), and a second coil 241 is arranged outside the sub-core 24 (the second coil 241 is arranged between the connecting ring 23 and the sub-core 24).

[0026] See also Figure 1 to Figure 3 In the utility model, gaps are provided between the main inner core 21, the auxiliary inner core 24 and the inner wall of the outer shell 1 (there are many ways to achieve non-contact between the main inner core 21, the auxiliary inner core 24 and the inner wall of the outer shell 1, such as providing a bracket of non-conductive material between the connecting ring 23 and the inner wall of the outer shell 1).

[0027] See also Figure 1 to Figure 3 In the present invention, the auxiliary inner core 24, the connecting ring 23, and the main inner core 21 (ie, the first inductive inner core 211, the second inductive inner core 212, the third inductive inner core 213, and the fourth inductive inner core 214) are all made of conductive materials.

[0028] See also Figure 1 to Figure 3When the outside of the shell 1 is subjected to a force along the radial direction of the shell 1, the load will be transferred to the shell 1. This force will produce a shearing effect on the shell 1. There will be shear stress generated by the shearing effect and positive stress generated by the lateral force bending on the shell 1. The stress state varies greatly along the axial, circumferential and radial directions. According to the principle of ferromagnetism, within a certain range, the change in magnetic permeability is positively correlated with the positive stress. The size of the internal stress of the shell 1 will change with different forces, resulting in a change in magnetic permeability. Using this principle, after power is turned on, the auxiliary core 24 generates a changing magnetic field due to the excitation of the second coil 241. The magnetic field returns to the auxiliary core 24 along the shell 1, the first induction core 211, the second induction core 212, the third induction core 213 and the fourth induction core 214 and closes. In the unstressed state, due to the symmetry of the magnetic circuit structure, the magnetic field distribution on the magnetic circuit is symmetrical. When the outer shell 1 is subjected to force, due to the special position of the auxiliary inner core 24 on the outer shell 1, the stress values ​​on both sides of the auxiliary inner core 24 will be different. The stress difference on both sides will lead to a difference in magnetic permeability, which is reflected in the output induced voltage. The output voltage changes to reflect the size of the force and the tension and compression state. The output voltage and force value are calibrated (calibrating the output voltage and force is a mature existing technology in this field and a conventional technical means for those skilled in the art. The specific calibration method will not be repeated here), and the voltage signal of the state of the induced force can be output.

[0029] See also Figure 1 to Figure 3 The first coil 22 on the first induction inner core 211 and the first coil 22 on the second induction inner core 212 are energized in opposite directions, the first coil 22 on the third induction inner core 213 and the first coil 22 on the fourth induction inner core 214 are energized in opposite directions, and the first coil 22 on the first induction inner core 211 and the first coil 22 on the third induction inner core 213 are energized in the same direction, and the first coil 22 on the second induction inner core 212 and the first coil 22 on the fourth induction inner core 214 are energized in the same direction, thereby reducing the influence of temperature during operation.

[0030] In order to improve the sensitivity of the utility model, the utility model provides the following embodiments:

[0031] Example 1

[0032] See also Figure 1 to Figure 4 On the basis of the above scheme, a groove 11 is provided on the outside of the shell 1 at the induction structure 2, and the inner side walls of the groove 11 are perpendicular to the shell 1. The groove 11 can provide a variable cross-section area for the shell 1, reducing the stiffness of the shell 1 in this area, so that the deformation of the shell 1 after being subjected to force increases, the internal stress also increases, and the difference in magnetic permeability in different areas of the shell 1 increases, so that the output voltage increases under the same force condition, thereby improving the sensitivity of the utility model.

[0033] Example 2

[0034] See also Figure 1 to Figure 4 On the basis of the above scheme, a groove 11 is provided on the outside of the shell 1 at the sensing structure 2, and the inner side walls of the groove 11 are inclined. The inclined inner side walls can not only improve the strength of the groove 11 and improve the service life of the shell 1, but also make the internal stress distribution of the groove 11 more uniform when the shell 1 is subjected to force (compared with the above-mentioned groove 11 whose inner side walls are perpendicular to the shell 1).

[0035] The utility model provides a tension sensor, including a sensing structure. When the outer part of the shell is subjected to a force along the radial direction of the shell, the load will be transferred to the shell. The sensing structure can sense the state of the force and output a voltage signal, so that the operator can monitor the tension at this place. A groove is provided on the outer part of the shell at the sensing structure. The groove can provide a variable cross-section area for the shell, reduce the rigidity of the shell in this area, increase the deformation of the shell after being subjected to force, increase the internal stress, increase the difference of magnetic permeability in different areas of the shell, and increase the output voltage under the same force condition, thereby improving the sensitivity. In summary, the beneficial effects of the utility model are: it can quickly sense the size and state of the force, is easy to install, and can detect within a circumferential range, has a wide range of applications, and has high sensitivity and detection accuracy.

[0036] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field can make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A tension sensor, characterized in that: It comprises a shell, wherein a mounting cavity is provided inside the shell, and a sensing structure is provided inside the mounting cavity of the shell; The induction structure includes a secondary inner core, a connecting ring is sleeved on the outside of the secondary inner core, a second coil is arranged between the secondary inner core and the connecting ring, the connecting ring connects a first induction inner core, a second induction inner core, a third induction inner core and a fourth induction inner core, and the first induction inner core, the second induction inner core, the third induction inner core and the fourth induction inner core are all sleeved on the outside with a first coil.

2. The tension sensor according to claim 1, characterized in that: The first coil on the first induction core and the first coil on the second induction core are energized in opposite directions, the first coil on the third induction core and the first coil on the fourth induction core are energized in opposite directions, and the first coil on the first induction core and the first coil on the third induction core are energized in the same direction.

3. The tension sensor according to claim 1, characterized in that: A groove is arranged on the outside of the housing at the sensing structure.

4. The tension sensor according to claim 3, characterized in that: The inner side walls of the grooves are perpendicular to the outer shell.

5. The tension sensor according to claim 3, characterized in that: The inner side walls of the grooves are all arranged inclined.

6. The tension sensor according to claim 1, characterized in that: The shell is a cylindrical structure.

7. The tension sensor according to claim 1, characterized in that: The secondary inner core is perpendicular to the main inner core.

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