Anti-torsion controllable tension and compression state strain gauge

Abstract

The utility model discloses an anti-torsion controllable tension and compression state strain gauge, which is characterized in that a pull string is sleeved with a sleeve, one end of the sleeve is fixedly connected with a fixed end, the other end of the sleeve is opposite to a tension and compression end, one end, facing the tension and compression end, of the sleeve is provided with a limiting notch, the tension and compression end extends towards the sleeve to form a boss, and the boss extends into the limiting notch; the boss and the limiting notch are matched to limit the displacement range between the pulling and pressing end and the sleeve in the axis direction of the sleeve and the relative displacement in the circumferential direction of the sleeve. Therefore, the limiting notch of the sleeve is matched with the boss, and the axial movement of the tension-compression end head can be limited in the axial direction of the sleeve, so that the movement of the tension-compression end head cannot exceed the measuring range of the tension-compression end head in the measurement process, the tension-compression range of the strain gauge is controlled, and the strain gauge is prevented from being damaged; meanwhile, the tension and compression end is limited to move circumferentially relative to the sleeve, so that the tension string is prevented from being twisted during measurement, and the tension string is also prevented from being damaged.

Description

Technical Field

[0001] This utility model relates to the field of strain gauge technology, and in particular to a torsion-resistant controllable tension-compression strain gauge. Background Technology

[0002] Strain gauges are widely used for stress and strain measurement within concrete structures such as bridges, highways, railways, subways, tunnels, dams, and foundation piles. Many large engineering structures, such as bridges, tunnels, dams, and high-rise buildings, are subject to various loads and environmental factors during long-term use, causing changes in their internal stress and strain states. By installing strain gauges, strain changes in critical parts of these structures can be monitored in real time, thereby assessing the structure's safety and health status, promptly identifying potential safety hazards, and preventing engineering accidents.

[0003] Strain gauges include vibrating wire strain gauges. Conventional vibrating wire strain gauges use a tension wire and an excitation electromagnetic coil to achieve measurement. Because the tension wire lacks protection during measurement, it is easily damaged or the tension / compression end connected to the tension wire can be ejected directly under the action of elastic force, causing the vibrating wire strain gauge to be damaged and unusable. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a strain gauge with controllable tension and compression under anti-torsion conditions, which can control the degree of tension and compression and prevent the tension string from twisting, so as to avoid damage to the strain gauge.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A torsion-resistant controllable tension-compression strain gauge includes a tension-compression end and a fixed end. A tension string connects the tension-compression end and the fixed end. A sleeve is fitted over the tension string, with one end of the sleeve fixedly connected to the fixed end and the other end facing the tension-compression end. A limiting notch is provided at the end of the sleeve facing the tension-compression end. A boss extends from the tension-compression end toward the sleeve, extending into the limiting notch. The boss and the limiting notch cooperate to limit the displacement range between the tension-compression end and the sleeve along the sleeve's axial direction and the relative displacement along the sleeve's circumference.

[0007] The beneficial effects of this utility model are: the limiting notch of the sleeve and the boss cooperate to restrict the axial movement of the tension and compression end in the axial direction of the sleeve, so that during the measurement process, the movement of the tension and compression end will not exceed its range, thereby controlling the tension and compression range of the strain gauge and avoiding its damage; at the same time, by restricting the circumferential movement of the tension and compression end relative to the sleeve, the tension string is prevented from twisting during the measurement, which also avoids its damage.

[0008] Specifically, the boss extends and is fitted inside the sleeve, and a limiting protrusion extends from the periphery of the boss, which cooperates with the limiting notch; the limiting notch pushes against the limiting protrusion along the periphery and axial direction of the sleeve.

[0009] Specifically, the limiting notch has a first plate on the side near the tension end. The first plate abuts against the limiting protrusion along the axial direction of the sleeve. One end of the first plate is connected to the limiting notch, and the other end extends into a second plate. The second plate extends away from the tension end and is perpendicular to the first plate. The second plate abuts against the limiting protrusion along the circumference of the sleeve.

[0010] Preferably, the limiting notch includes: a bottom wall near the drawstring and a first side wall and a second side wall perpendicular to the bottom surface; the first side wall extends out of the first plate, an opening is left between the second plate and the second side wall, and a first gap is left between the end of the second plate and the bottom wall.

[0011] Preferably, the gap between the second plate and the second sidewall is H1, the gap between the second plate and the first sidewall is H2, the first distance is H3, H1≥H2 and H3≥H2.

[0012] Preferably, when the drawstring is at its initial length, there is a gap between the limiting protrusion and the first plate, and the distance between the limiting protrusion and the first plate is H4.

[0013] Preferably, H4 is 0.5mm to 1mm.

[0014] Preferably, when the drawstring is at its initial length, the distance between the center point of the limiting protrusion and the end of the second plate in the axial direction of the sleeve is H5, and the distance between the tension end and the first plate is H6, where H5 > H6.

[0015] Preferably, the H6 is 0.5mm to 1mm.

[0016] Specifically, a sealing housing is provided in the middle section of the sleeve, and a coil assembly is provided inside the sealing housing. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a strain gauge structure for anti-torsion controllable tension and compression according to an embodiment of this application;

[0018] Figure 2 This is a schematic diagram of another angle of a strain gauge for anti-torsion controllable tension and compression according to an embodiment of this application;

[0019] Figure 3 yes Figure 2 A magnified view of a portion of region A in the middle;

[0020] In the picture:

[0021] 100-Anti-torsion controllable tension / compression strain gauge;

[0022] 110 - Tension / compression end, 111 - Boss, 112 - Limiting protrusion;

[0023] 120 - Fixed end;

[0024] 130-Sleeve, 13-Limiting notch, 131-Bottom wall, 132-First side wall, 1321-First plate, 1322-Second plate, 133-Second side wall, 14-Sealing shell;

[0025] 140 - Electromagnetic coil. Detailed Implementation

[0026] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] See Figures 1-3 This utility model provides a technical solution:

[0028] According to the embodiment of this application, the anti-torsion controllable tension-compression strain gauge 100, with reference to... Figure 1 The system comprises a tension / compression end 110 and a fixed end 120, connected by a tension / compression end 110 and a fixed end 120, and an electromagnetic coil 140 that works in conjunction with the tension / compression end 110 to achieve detection. When the tension / compression end 110 and the fixed end 120 are subjected to an external force and undergo relative displacement, the tension state of the tension string changes due to stretching or compression. This change in tension is directly reflected in a change in the vibration frequency of the tension string. At this time, the electromagnetic coil 140, which works closely with the tension string, converts the mechanical vibration of the tension string into an electrical signal output through the principle of electromagnetic induction. By performing frequency analysis on this electrical signal, the change in tension on the tension string can be accurately calculated, thereby deducing the strain state at the location of the strain gauge and achieving accurate detection of the corresponding variable.

[0029] Conventional vibrating wire strain gauges may twist during measurement due to improper operation, or be damaged after a period of measurement because the deformation of the target exceeds the range of the vibrating wire strain gauge. To address this, the tension wire is fitted with a sleeve 130, one end of which is fixedly connected to the fixed end 120, and the other end is directly opposite the tension / compression end 110. A limiting notch 13 is provided at the end of the sleeve 130 facing the tension / compression end 110, and a boss 111 extends from the tension / compression end 110 toward the sleeve 130, extending into the limiting notch 13.

[0030] For example, refer to Figure 2 As shown, the boss 111 extends and is fitted inside the sleeve 130. A limiting protrusion 112 extends from the periphery of the boss 111. In this example, the limiting protrusion 112 is a columnar structure extending from the periphery of the boss 111. The cylindrical surface of the columnar structure cooperates with the limiting notch 13, so that the limiting notch 13 pushes against the limiting protrusion 112 along the periphery and axial direction of the sleeve 130.

[0031] Of course, in different examples, the way the boss 111 and the limiting notch 13 cooperate can also be different. For example, the two can cooperate by means of snapping or locking, which will not be elaborated here.

[0032] In this way, the boss 111 and the limiting notch 13 cooperate to limit the displacement range between the tension end 110 and the sleeve 130 along the axial direction of the sleeve 130, thereby limiting the movement of the tension end 110 along the axial direction, and ensuring that the movement of the tension end 110 does not exceed the range of the drawstring, as well as the relative displacement along the circumference of the sleeve 130. The other end of the sleeve 130 can be fixedly set with the fixed end 120, such as integrally connected, so that the sleeve 130 is stationary relative to the fixed end 120, thereby keeping the tension end 110 from rotating relative to the sleeve 130, that is, preventing abnormal torsion of the drawstring during the measurement process.

[0033] Understandably, the limiting notch 13 of the sleeve 130 cooperates with the boss 111 to restrict the axial movement of the tension / compression end 110 in the axial direction of the sleeve 130. This ensures that the movement of the tension / compression end 110 does not exceed its range during measurement, thereby controlling the tension / compression range of the strain gauge and preventing damage. At the same time, by limiting the circumferential movement of the tension / compression end 110 relative to the sleeve 130, the tension string is prevented from twisting during measurement, thus also preventing damage.

[0034] Next, continue to refer to Figures 2-3 The corresponding example provides a detailed description of the anti-torsion controllable tension-compression strain gauge 100 of the present application embodiment.

[0035] In the example, the limiting notch 13 includes: a bottom wall 131 near the tension string and a first side wall 132 and a second side wall 133 perpendicular to the bottom surface, and the limiting protrusion 112 is a cylindrical structure.

[0036] The limiting notch 13 has a first plate 1321 on the side near the tension end 110. When the tension end 110 is fixed to the object being measured, and the tension end 110 begins to move a certain distance along the axis of the sleeve 130, the first plate 1321 can push against the cylindrical surface of the limiting protrusion 112 along the axis of the sleeve 130. In this way, through the above-mentioned pushing action, the tension end 110 can be kept from moving beyond the first plate 1321, so as not to be overstretched and cause the tension string to break.

[0037] One end of the first plate 1321 is connected to the limiting notch 13, and the other end extends into a second plate 1322. The second plate 1322 extends away from the tension end 110 and is perpendicular to the first plate 1321. The second plate 1322 pushes against the cylindrical surface of the limiting protrusion 112 along the circumference of the sleeve 130, thereby preventing the tension end 110 from twisting relative to the sleeve 130.

[0038] In detail, the first sidewall 132 extends into the first plate 1321, the end of the first plate 1321 bends and extends into the second plate 1322, an opening is left between the second plate 1322 and the second sidewall 133, and a first gap is left between the end of the second plate 1322 and the bottom wall 131; during the installation process before the vibrating wire strain gauge is actually tested, the tension end 110 needs to be properly connected and fixed to the object being measured, and then the vibrating wire strain gauge is installed. During the process, the operator can move the tension end 110 toward the sleeve 130. At this time, the protrusion 111 extending from the tension end 110 and the limiting protrusion 112 on it will gradually approach the limiting notch 13 of the sleeve 130.

[0039] During installation, the limiting protrusion 112 can smoothly pass through the opening and enter the limiting notch 13. After the limiting protrusion 112 enters the limiting notch 13, the operator continues to adjust the position of the tension end 110 so that the limiting protrusion 112 passes through the first gap and finally gets stuck between the second plate 1322 and the first side wall 132.

[0040] After installation, the first plate 1321 can block the limiting protrusion 112 along the axial direction of the sleeve 130, limiting the excessive movement of the tension end 110 in the axial direction; the second plate 1322 pushes against the cylindrical surface of the limiting protrusion 112 along the circumference of the sleeve 130 to prevent the tension end 110 from twisting relative to the sleeve 130.

[0041] More specifically, the gap between the second plate 1322 and the second sidewall 133 is H1, the gap between the second plate 1322 and the first sidewall 132 is H2, the first distance is H3, H1 ≥ H2 and H3 ≥ H2. (Combined) Figure 3 It is understood that the gap H2 between the second plate 1322 and the first sidewall 132 is suitable for axial engagement with the limiting protrusion 112 along the sleeve 130. Therefore, H2 is actually substantially the same as the diameter R of the limiting protrusion 112. To ensure that the limiting protrusion 112 can enter the space between the second plate 1322 and the first sidewall 132 from the opening and the first gap, it should be ensured that H1≥H2 and H3≥H2, in other words, that is, that H1≥R and H3≥R.

[0042] As described above, during the measurement process of the vibrating wire strain gauge, the tension / compression end 110 will move. Therefore, in the initial state before measurement, the tension wire is at its initial length and the tension / compression end 110 is in its initial position. Correspondingly, a gap is left between the limiting protrusion 112 and the first plate 1321, and the distance between the limiting protrusion 112 and the first plate 1321 is H4. This ensures that the tension / compression end 110 can generate a stretch of H4 length during measurement. In some preferred examples, H4 is preferably 0.5mm~1mm, which corresponds to a tension wire that can be stretched by 0.5mm~1mm.

[0043] Furthermore, when the drawstring is at its initial length, the distance between the center point of the limiting protrusion 112 and the end of the second plate 1322 along the axial direction of the sleeve 130 is H5, and the distance between the tension end 110 and the first plate 1321 is H6, where H5 > H6. Thus, when the tension end 110 moves towards the fixed end 120, i.e., when the drawstring retracts to H6, the tension end 110 will abut against the end of the sleeve 130 to restrict movement. Ensuring that the distance H5 between the center point of the limiting protrusion 112 and the end of the second plate 1322 along the axial direction of the sleeve 130 is greater than H6 prevents the limiting protrusion 112 from moving to the first gap, thus causing anti-torsion failure.

[0044] In some preferred embodiments, H6 is 0.5mm to 1mm, thereby ensuring that the maximum distance that the tension end 110 moves toward the fixed end 120 is 0.5mm to 1mm.

[0045] Combination Figures 1-3As shown, based on any of the above embodiments, a sealing housing 14 is provided in the middle section of the sleeve 130. A coil assembly is housed within the sealing housing 14. The sealing housing 14 can be made of high-strength, corrosion-resistant materials, such as stainless steel or engineering plastics, to ensure effective protection of the internal coil assembly from external interference and damage in various complex environments. The sealing housing 14 and the sleeve 130 are connected by a precise sealing process, such as welding or using sealant, to prevent moisture, dust, and other impurities from entering the housing and affecting the normal operation of the coil assembly.

[0046] The coil assembly includes an electromagnetic coil 140 wound on a specific frame. The frame is made of a material with good insulation properties to ensure electrical isolation between the coils. The coil assembly also includes matching electronic components, such as signal amplification circuits and filtering circuits. These electronic components are connected to the electromagnetic coil 140 through wires to form a complete signal processing system.

[0047] An interface for connecting to external devices can be provided on one side of the fixed end 120 of the sleeve 130. This interface adopts a standardized design, such as an aviation plug or terminal block, to facilitate connection with data acquisition systems, display devices, etc. Through this interface, the electrical signals detected by the vibrating wire strain gauge can be accurately and stably transmitted to external devices for further analysis and processing.

[0048] The above description is merely a preferred embodiment of this utility model. It should be understood that this utility model is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this utility model should be protected within the scope of the appended claims.

Claims

1. A torsion-resistant controllable tension / compression strain gauge, comprising a tension / compression end and a fixed end, wherein a tension / compression end and a fixed end are connected by a tension string, characterized in that: The outer sleeve of the pull string is provided with a sleeve, one end of which is fixedly connected to the fixed end, and the other end is directly opposite the tension end. A limiting notch is provided at the end of the sleeve facing the tension end, and a boss extends from the tension end toward the sleeve, with the boss extending into the limiting notch. The boss and the limiting notch cooperate to limit the displacement range between the tension / compression end and the sleeve along the sleeve axis and the relative displacement along the sleeve circumferential direction.

2. The anti-torsion controllable tension / compression strain gauge according to claim 1, characterized in that, The boss extends and is fitted inside the sleeve, and a limiting protrusion extends from the periphery of the boss, the limiting protrusion cooperating with the limiting notch; The limiting notch pushes against the limiting protrusion along the circumference and axial direction of the sleeve.

3. The anti-torsion controllable tension / compression strain gauge according to claim 2, characterized in that, The limiting notch has a first plate on the side near the tension end. The first plate abuts against the limiting protrusion along the axial direction of the sleeve. One end of the first plate is connected to the limiting notch, and the other end extends into a second plate. The second plate extends away from the tension end and is perpendicular to the first plate. The second plate abuts against the limiting protrusion along the circumference of the sleeve.

4. The anti-torsion controllable tension / compression strain gauge according to claim 3, characterized in that, The limiting notch includes: a bottom wall near the drawstring and a first side wall and a second side wall perpendicular to the bottom surface; The first sidewall extends out of the first plate, an opening is left between the second plate and the second sidewall, and a first gap is left between the end of the second plate and the bottom wall.

5. The anti-torsion controllable tension / compression strain gauge according to claim 4, characterized in that, The gap between the second plate and the second sidewall is H1, the gap between the second plate and the first sidewall is H2, the first distance is H3, H1≥H2 and H3≥H2.

6. The anti-torsion controllable tension / compression strain gauge according to claim 4, characterized in that, When the drawstring is at its initial length, there is a gap between the limiting protrusion and the first plate, and the distance between the limiting protrusion and the first plate is H4.

7. The anti-torsion controllable tension / compression strain gauge according to claim 6, characterized in that, The H4 is 0.5mm~1mm.

8. The anti-torsion controllable tension / compression strain gauge according to claim 6, characterized in that, When the drawstring is at its initial length, the distance between the center point of the limiting protrusion and the end of the second plate in the axial direction of the sleeve is H5, and the distance between the tension end and the first plate is H6, where H5 > H6.

9. The anti-torsion controllable tension / compression strain gauge according to claim 8, characterized in that, The H6 is 0.5mm~1mm.

10. The anti-torsion controllable tension / compression strain gauge according to claim 1, characterized in that, A sealing housing is provided in the middle section of the sleeve, and a coil assembly is provided inside the sealing housing.

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