Tension detection device

Abstract

The utility model provides a tension detection device, which comprises a sleeve, a sensor body and a force sensor, the force sensor is mounted on the sensor body, one end of the force sensor is inserted into the sleeve, and a measuring end of the other end of the sensor body is arranged outside the sleeve and used for bearing external force. The sleeve and the sensor body are fastened by using the locking device, and the contact point of the locking device and the sensor body is used as a fulcrum to form a lever structure, so that the external force detected by the measuring end can be amplified when being transmitted to the stress end through the lever structure, thereby realizing the detection of the tension. And the change of tiny tension can be sensed more accurately.

Description

Technical Field

[0001] This utility model relates to the field of tension detection, and in particular to a tension detection device. Background Technology

[0002] In modern industrial production, tension testing devices are widely used as a crucial measuring tool in numerous fields, such as papermaking, plastic film production, metal sheet processing, textiles, packaging machinery, and cable manufacturing. These industries have extremely high requirements for the accuracy, stability, and reliability of tension testing; precise tension control is directly related to product quality, production efficiency, and equipment operational safety.

[0003] However, existing tension detection devices suffer from numerous technical problems in practical applications, which seriously affect the smooth operation of the production process and the improvement of product quality. First, insufficient measurement accuracy is a prominent issue. Traditional tension detection devices often struggle to accurately measure minute tension changes due to limitations in their structural design and sensor performance. For example, in some strain gauge-based tension sensors, the strain gauges have limited sensitivity and linearity, resulting in weak measurement signals that are easily affected by external interference, thus failing to accurately reflect the actual tension situation. This measurement error is particularly pronounced in the low tension range, posing a significant challenge to production processes requiring precise tension control.

[0004] Secondly, poor structural stability is a major drawback of existing tension detection devices. Many devices are prone to structural deformation, loosening, or damage in complex industrial environments, such as high temperature, high humidity, and vibration. Taking a common tension roller-type detection device as an example, the fit accuracy between the roller and the bearing decreases with long-term use and environmental factors, leading to poor repeatability and stability of the measurement results. Furthermore, the connection structure between the sensor and the object being measured in some devices is not well-designed, and when tension changes significantly, structural resonance or shaking can easily occur, further affecting the accuracy of the measurement.

[0005] Furthermore, existing tension detection devices have poor environmental adaptability. In actual production, equipment often needs to operate in harsh environments, such as dusty, oily, and corrosive gases. However, many tension detection devices lack effective sealing and protection measures, making their internal electronic components and mechanical parts susceptible to contamination and corrosion. For example, in some chemical production lines, the sensor surface of tension detection devices adsorbs a large amount of chemical media. These media not only interfere with the measurement signal but also gradually corrode the sensor material, shortening its service life and increasing equipment maintenance costs and downtime.

[0006] Finally, the limited service life of existing tension testing devices cannot be ignored. Due to shortcomings in structural design and material selection, these devices are prone to various malfunctions during prolonged use. For example, some devices based on mechanical measurement principles experience fatigue aging of their internal elastic elements under repeated tension, leading to a gradual decrease in measurement accuracy and ultimately failing to meet production requirements. Furthermore, the frequent replacement of vulnerable components in some devices not only increases production costs for enterprises but also affects the continuity of production.

[0007] In summary, existing tension testing devices face several challenges in terms of measurement accuracy, structural stability, environmental adaptability, and service life. These issues make it difficult for traditional tension testing devices to meet the demands of many high-precision, high-reliability production scenarios. Therefore, a new type of tension testing device is urgently needed to overcome these technical difficulties and improve production efficiency, product quality, and equipment operational safety. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides a tension detection device. Through a lever structure in the sensor body, using the contact point between the locking device and the force-bearing end as a fulcrum, the sensor body can generate an amplification effect when subjected to force. This effective application of the lever structure achieves precise amplification of the external force borne by the measuring end, significantly improving the sensitivity and accuracy of tension detection. This allows the tension detection device to capture subtle changes in tension, providing a strong guarantee for accurate tension measurement.

[0009] This utility model achieves the above-mentioned technical objectives through the following technical means.

[0010] A tension detection device includes a sleeve, a sensor body, and a force sensor; one end of the sensor body is inserted into the sleeve, and the other end of the sensor body extends to the outside of the sleeve for connection with the workpiece to be measured; a groove is provided on the end of the sensor body inserted into the sleeve, and the force sensor is installed in the groove; the sensor body is connected to the sleeve by a fastening device, and the fastening device serves as a fulcrum for the sensor body, so that the sensor body forms a lever structure.

[0011] Furthermore, the sensor body includes a force-receiving end, a measuring end, and a connecting section. The measuring end is located outside the sleeve and is used to connect with the workpiece to be measured. The force-receiving end is inserted into the sleeve and positioned by a limiting step inside the sleeve. The force-receiving end and the measuring end are connected by the connecting section, and the side of the force-receiving end is provided with a groove.

[0012] Furthermore, the force-bearing end is clearance-fitted with the inner wall of the sleeve, and a gap is formed between the outer circumferential surface of the measuring end and the inner circumferential surface of the sleeve, the gap allowing relative displacement of the measuring end within the measuring range.

[0013] Furthermore, the force-bearing end is connected to the sleeve through a tightening device, and a lever structure is formed with the contact point between the tightening device and the force-bearing end as the fulcrum, which is used to amplify the external force borne by the measuring end.

[0014] Furthermore, the cross-sectional area from the measuring end to the connecting section drops sharply, and the ratio of the cross-sectional area of ​​the measuring end to the cross-sectional area of ​​the connecting section is between 2.5 and 3.5.

[0015] Furthermore, a sealing structure is provided between one end of the sensor body inserted into the sleeve and the sleeve.

[0016] Furthermore, limiting blocks are provided on both sides of the sleeve into which the measuring end is inserted; the limiting blocks are at a set distance from the measuring end after being inserted into the sleeve.

[0017] The beneficial effects of this utility model are as follows:

[0018] 1. The tension detection device of this utility model, through the lever structure of the sensor body, uses the contact point between the locking device and the force-bearing end as the fulcrum, enabling the sensor body to generate an amplification effect when subjected to force. This effective application of the lever structure achieves precise amplification of the external force borne by the measuring end, significantly improving the sensitivity and accuracy of tension detection. This allows the tension detection device to capture subtle changes in tension, providing a strong guarantee for accurate tension measurement.

[0019] 2. The tension detection device of this utility model comprises a force-receiving end, a measuring end, and a connecting section. The measuring end is located on the outside of the sleeve and connected to the workpiece to be measured. The force-receiving end is inserted into the sleeve and positioned by a limiting step. A large gap exists between the measuring end and the inner circumferential surface of the sleeve, allowing the measuring end to undergo relative displacement within the measuring range. Simultaneously, this ensures that the sensor body can stably transmit force when subjected to stress, avoiding measurement errors caused by structural interference and ensuring the stability and reliability of the measurement process.

[0020] 3. The tension detection device of this utility model has a sealing structure between the sensor body at one end inserted into the sleeve and the sleeve, which can effectively prevent external dust, oil and liquid impurities from entering the sleeve, protect the force sensor and other internal components, prevent them from being contaminated and damaged, thereby improving the service life and measurement accuracy of the device, and enhancing the applicability and reliability of the device in harsh environments.

[0021] 4. The tension detection device of this utility model has limiting blocks on both sides of the sleeve into which the measuring end is inserted, and the limiting blocks are at a set distance from the measuring end after being inserted into the sleeve. The limiting blocks can restrict the displacement of the measuring end, prevent the measuring end from exceeding the measuring range when subjected to excessive force, avoid excessive friction and collision between the measuring end and the sleeve, effectively protect the sensor body and the measuring end, and extend the service life of the device.

[0022] 5. The tension detection device of this utility model features a sharp drop in cross-sectional area from the measuring end to the connecting section, with the ratio of the cross-sectional area of ​​the measuring end to the connecting section controlled between 2.5 and 3.5. This unique design allows the measuring end to undergo more significant deformation when subjected to external force, thereby improving the response speed and measurement sensitivity of the force sensor to tension changes, and further enhancing the performance of the tension detection device. Attached Figure Description

[0023] 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. The drawings described below are some embodiments of this utility model. For those skilled in the art, it is obvious that other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a three-dimensional view of the tension detection device described in this utility model.

[0025] Figure 2 This is a cross-sectional view of the tension detection device described in this utility model.

[0026] Figure 3 This is a three-dimensional view of the sensor body described in this utility model.

[0027] In the picture:

[0028] 1-Sleeve; 2-Sealing structure; 3-Sensor body; 3-1-Groove; 3-2-Force-receiving end; 3-3-Measuring end; 3-4-Connecting section; 4-Upper limit block; 5-Lower limit block; 6-Force sensor; 7-Set screw; 8-Spindle. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0030] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] like Figure 1 As shown, the tension detection device of this utility model includes a sleeve 1, a sensor body 3, and a force sensor 6. One end of the sensor body 3 is inserted into the sleeve 1, and the other end extends to the outside of the sleeve 1 and is connected to the workpiece to be measured via a threaded connection. A groove 3-1 is provided on the side of the end of the sensor body 3 that is inserted into the sleeve 1. The groove 3-1 is located inside the sleeve 1, and the force sensor 6 is installed in the groove 3-1 and fits tightly against the sensor body 3. The sensor body 3 is connected to the sleeve 1 by a set screw 7, which is installed in a threaded hole on the side of the sleeve 1, passes through the sleeve 1, and contacts the sensor body 3. When the workpiece to be measured is subjected to an external force (tension), the sensor body 3 forms a lever structure with the contact point between the set screw 7 and the sleeve 1 as the fulcrum, enabling the force sensor 6 to sense the change in tension. The tension detection device of this utility model, through the lever structure of the sensor body 3, with the contact point between the set screw 7 and the force-bearing end as the fulcrum, enables the sensor body to produce an amplification effect when subjected to force. The effective application of this lever structure enables precise amplification of the external force borne by the measuring end, significantly improving the sensitivity and accuracy of tension detection. This allows the tension detection device to capture tension changes more precisely, providing a strong guarantee for accurate tension measurement.

[0033] like Figure 2 and Figure 3 As shown, the sensor body 3 includes a force-receiving end 3-2, a measuring end 3-3, and a connecting section 3-4. The measuring end 3-3 is located outside the sleeve 1 and is used to connect with the workpiece to be measured, capturing the tension change of the workpiece. The force-receiving end 3-2 is inserted into the sleeve 1 and positioned by a limiting step inside the sleeve 1 to prevent positional shift during later use. The force-receiving end 3-2 and the measuring end 3-3 are connected by the connecting section 3-4. A groove 3-1 is provided on the side of the force-receiving end 3-2, and a force sensor 6 is installed in the groove 3-1 to sense the stress change of the sensor body 3. Using the contact point between the set screw on the sensor body 3 and the sleeve 1 as a fulcrum, the sensor body 3 forms a lever structure, allowing the measuring end 3-3 to sense the stress change. The change in tension is transmitted to the force sensor 6 at the force-receiving end 3-2 through the connecting section 3-4, and the external force borne by the measuring end 3-3 is amplified at the force-receiving end 3-2 through the lever structure. Furthermore, the cross-sectional area from the measuring end 3-3 to the connecting section 3-4 is set to a sudden drop, with the cross-sectional area of ​​the connecting section 3-4 being significantly smaller than that of the measuring end 3-3. For example, the ratio of the cross-sectional area of ​​the measuring end 3-3 to the cross-sectional area of ​​the connecting section 3-4 can be set between 2.5 and 3.5 to ensure that the measuring end 3-3 undergoes sufficiently large deformation when subjected to external force, enabling the force sensor 6 at the force-receiving end 3-2 to more accurately sense changes in tension, even subtle changes, thus improving the sensitivity of tension detection. To ensure the normal operation of the tension detection device, the force-receiving end 3-2 is inserted into the sleeve 1 and achieves a clearance fit with the inner wall surface of the sleeve 1. This clearance fit is a tolerance fit based on a hole-basis system or a shaft-basis system in mechanical design. Generally, the clearance between the force-receiving end 3-2 and the inner wall of the sleeve 1 on one side is less than 0.02mm. Then, a set screw 7 passes through the sleeve 1 and contacts the force-receiving end 3-2, thus fixing the force-receiving end 3-2, including the internal force sensor 6. A gap is also formed between the outer circumferential surface of the measuring end 3-3 and the inner wall surface of the sleeve 1. This gap is much larger than the clearance fit size. In this embodiment, the outer circumferential surface of the measuring end 3-3 has a large gap of 3-5mm on one side with the inner wall surface of the sleeve 1, which is much larger than the clearance fit of a hole-basis system or a shaft-basis system in mechanical design. This gap ensures that the measuring end 3-3 can move relatively within the allowable measurement range inside the sleeve 1 during operation, ensuring that the device can perform its monitoring function normally.

[0034] like Figure 2As shown, a sealing structure 2 is provided between the measuring end 3-3 of the sensor body 3 and the sleeve 1. The sealing structure 2 is annularly arranged along the inner wall surface of the outermost end of the sleeve 1, thereby sealing and enclosing the measuring end 3-3 inside the sleeve 1. This prevents external dust, oil, and other impurities from entering the interior of the sleeve 1 through the end opening and affecting the normal operation of the sensor body 3. The sealing structure 2 not only ensures the performance of the tension detection device in harsh environments but also extends the device's lifespan and maintains the accuracy of tension detection. Generally, the sealing structure 2 is a dustproof ring or a dustproof sponge.

[0035] like Figure 2 As shown, in this embodiment, the measuring end 3-3 is connected to the shaft of the reel 8 by bolts, and the reel 8 is supported on the shaft by bearings. The rotation of the reel 8 will not drive the shaft to rotate, so the change in tension during the rotation of the reel 8 can be transmitted to the measuring end 3-3.

[0036] like Figure 2 As shown, the sleeve 1 has several through holes radially opposite each other at its end. A limiting block is installed in any of these through holes. After being inserted into the sleeve 1, the limiting block is at a set distance from the measuring end 3-3, which limits the displacement of the measuring end and prevents it from exceeding the measuring range under excessive force. This avoids excessive friction and collision between the measuring end 3-3 and the sleeve, effectively protecting the sensor body and the measuring end, and extending the service life of the device. The limiting block includes an upper limiting block 4 and a lower limiting block 5. The upper sleeve 1 is inserted into the upper limiting block 4, and the distance from the upper limiting block 4 to the surface of the measuring end 3-3 is X1. The lower sleeve 1 is inserted into the lower limiting block 5, and the distance from the lower limiting block 5 to the surface of the measuring end 3-3 is X2. When the measuring end 3-3 is subjected to a downward force, X2 is greater than X1; when the measuring end 3-3 is subjected to an upward force, X1 is greater than X2. In this embodiment, the measuring end 3-3 is subjected to a downward force, X2 is 2.5 mm, and X1 is 1 mm. The upper limit block 4 and the lower limit block 5 can be set screws, which can limit the measurement end 3-3.

[0037] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0038] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present utility model, and are not intended to limit the scope of protection of the present utility model. All equivalent embodiments or modifications made without departing from the spirit of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. A tension detection device, characterized in that, It includes a sleeve (1), a sensor body (3), and a force sensor (6); one end of the sensor body (3) is inserted into the sleeve (1), and the other end of the sensor body (3) extends to the outside of the sleeve (1) for connection with the workpiece to be measured; a groove (3-1) is provided on one end of the sensor body (3) inserted into the sleeve (1), and the force sensor (6) is installed in the groove (3-1); the sensor body (3) is connected to the sleeve (1) by a fastening device, and the fastening device serves as the fulcrum of the sensor body (3), so that the sensor body (3) forms a lever structure.

2. The tension detection device according to claim 1, characterized in that, The sensor body (3) includes a force-receiving end (3-2), a measuring end (3-3), and a connecting section (3-4). The measuring end (3-3) is located outside the sleeve (1) and is used to connect with the workpiece to be measured. The force-receiving end (3-2) is inserted into the sleeve (1) and positioned by a limiting step inside the sleeve (1). The force-receiving end (3-2) and the measuring end (3-3) are connected by the connecting section (3-4). The side of the force-receiving end (3-2) is provided with a groove (3-1).

3. The tension detection device according to claim 2, characterized in that, The force-bearing end (3-2) is fitted with the inner wall of the sleeve (1) with a clearance, and a gap is formed between the outer circumferential surface of the measuring end (3-3) and the inner circumferential surface of the sleeve (1). The gap allows the relative displacement of the measuring end (3-3) within the measuring range.

4. The tension detection device according to claim 2, characterized in that, The force-receiving end (3-2) is connected to the sleeve (1) through a fastening device. The contact point between the fastening device and the force-receiving end (3-2) is used as the fulcrum to form a lever structure, which is used to amplify the external force borne by the measuring end (3-3).

5. The tension detection device according to claim 2, characterized in that, The cross-sectional area of ​​the measuring end (3-3) drops sharply from the connecting section (3-4), and the ratio of the cross-sectional area of ​​the measuring end (3-3) to the cross-sectional area of ​​the connecting section (3-4) is between 2.5 and 3.

5.

6. The tension detection device according to claim 1, characterized in that, A sealing structure (2) is provided between one end of the sensor body (3) inserted into the sleeve (1) and the sleeve (1).

7. The tension detection device according to claim 2, characterized in that, Limiting blocks are provided on both sides of the sleeve (1) inserted into the measuring end (3-3); after the limiting blocks are inserted into the sleeve (1), there is a set distance between them and the measuring end (3-3).

Images