Strain type tension sensor

Abstract

The strain type tension sensor comprises a box body, an opening is arranged in the middle of the upper part of the box body, a connecting hole is arranged outside the box body on one side of the opening, and an outer wheel group is arranged on one side of the box body facing the opening; the sensing assembly is arranged in the box body and comprises a supporting plate, an inner wheel set rotationally mounted above the supporting plate, and a resistance type strain gauge mounted on the supporting plate; the first auxiliary wheel, the third auxiliary wheel and the second auxiliary wheel are arranged and matched with the induction rope, on one hand, the buffering effect is achieved, tiny triggering is avoided, mistaken touch recognition such as recognition of small objects such as light birds is reduced, and the recognition accuracy is improved. When the motor guide rod retracts, the support plate is driven to descend, and the third auxiliary wheel drags more induction ropes into the box body, so that the length of the external induction rope is shortened, and the tensioning strength of the induction rope is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a strain type tension sensor belongs to sensor technical field. BACKGROUND

[0002] The strain type tension sensor is a kind of sensor for measuring tension or tension, it is by detecting the strain (deformation) of elastic element (such as metal sheet or induction rope) to determine the size of the force applied.The core component of strain type tension sensor is strain gauge (strain gauge), when elastic element is subjected to tension, strain gauge will be deformed, resistance will also change, the change of resistance can be calculated by measuring the tension applied.This sensor has high precision, high sensitivity and good stability, is widely used in various industrial and research fields.

[0003] The use scene of strain type tension sensor is extensive, such as indoor for monitoring the tension of rope or belt in warehousing equipment, ensure the safe transportation and storage of goods.Such as outdoor for monitoring the tension of bridge suspension cable, building support structure etc., ensure the stability and safety of structure.

[0004] The existing part strain type tension sensor, especially in the case of using induction rope as elastic element, with the increase of use time, induction rope will gradually creep, that is, under constant tension, rope slowly and continuously elongates.This rope creep can cause the calibration parameter of sensor to change, thereby affecting the measurement accuracy.

[0005] Therefore, the purpose of this study is to design a strain type tension sensor that can adapt to external environment and adjust the tension strength of induction rope to control the measurement accuracy. CONTENT OF THE UTILITY MODEL

[0006] In view of the deficiencies existing in the prior art, the utility model aims to provide a strain type tension sensor to solve the problems of prior art.

[0007] In order to realize the above-mentioned purpose, the utility model is realized by the following technical scheme:

[0008] A strain type tension sensor, comprising:

[0009] Box body, the upper middle part of the box body is provided with an open port, the outer part of the box body on one side of the open port is provided with a connecting hole, and the box body is provided with an outer wheel set towards one side of the open port;

[0010] The sensing assembly is arranged in the box body, and the sensing assembly comprises a supporting plate, an inner wheel set rotatably installed above the supporting plate and a resistance strain gauge installed on the supporting plate;

[0011] An induction rope is connected to the connecting hole at one end, the induction rope enters the opening, loops around the inner wheel set, and exits the opening, the other end of the induction rope is connected to the target object;

[0012] An adjusting assembly is arranged to drive the support plate to rise or fall;

[0013] A control module and a timing module are electrically connected to the adjusting assembly and the resistance strain gauge;

[0014] The control module controls the adjusting assembly to drive the support plate to rise or fall to adjust the thermal expansion and contraction of the induction rope;

[0015] The timing module is preset with a cycle trigger time, and the control module controls the adjusting assembly to drive the support plate to fall by a preset distance at each trigger time.

[0016] As a further improvement, the edge of the box body towards the opening is outwardly extended and provided with a mounting plate, the outer wheel set includes a first auxiliary wheel and a second auxiliary wheel, and the first auxiliary wheel and the second auxiliary wheel are rotatably mounted on the mounting plate.

[0017] As a further improvement, the outer diameter distance of the farthest side of the first auxiliary wheel and the second auxiliary wheel is consistent with the length of the opening.

[0018] As a further improvement, the inner wheel set is a third auxiliary wheel, the induction rope is attached above the first auxiliary wheel, loops around the third auxiliary wheel from the opening, and extends above the second auxiliary wheel from the opening and is connected to the target object.

[0019] As a further improvement, the adjusting assembly includes a motor guide rod for suspending and fixing the support plate, and a motor for driving the motor guide rod to extend or retract, and the motor is fixedly installed below the box body.

[0020] As a further improvement, the top end of the motor guide rod corresponds to the connecting hole, and the induction rope is connected to the top end of the motor guide rod.

[0021] As a further improvement, the support plate is provided with a set of extensions on the side towards the motor guide rod, and a guide slot is formed between the two extensions.

[0022] A guide rod is arranged on the side of the motor guide rod away from the support plate, the guide rod is arranged in parallel with the motor guide rod, and the guide rod is embedded at both ends in the box body.

[0023] The guide rod is inserted into the guide slot.

[0024] As a further improvement, a temperature sensing module is also included, which is electrically connected with the control module, and the temperature sensing module detects the external temperature, and cooperates with the control module to control the control adjustment assembly to drive the support plate to descend by a preset distance when the external temperature rises / descends to a preset temperature.

[0025] Advantages:

[0026] The first auxiliary wheel, the third auxiliary wheel and the second auxiliary wheel are arranged in cooperation with the sensing rope, which plays a buffering role, avoids subtle triggering, reduces the misidentification of light birds and other small objects, and improves the accuracy of identification.

[0027] By driving the support plate to rise or descend, the position of the resistance strain gauge and the tension strength of the sensing rope can be dynamically adjusted, so that the strain change caused by the creep of the sensing rope is compensated.

[0028] When the motor guide rod is retracted, the support plate is lowered, and the third auxiliary wheel pulls more sensing rope into the box body, thereby shortening the length of the external sensing rope, thereby enhancing the tension strength of the sensing rope.

[0029] Since the general tension sensor has limited volume, the size of the box body is also limited, so that the retracted length of the sensing rope is limited, and therefore the top end of the motor guide rod corresponds to the connecting hole, and the sensing rope is bound to the top end of the motor guide rod.

[0030] Therefore, when the motor guide rod is retracted, the sensing rope can be pulled by the third auxiliary wheel, and the sensing rope can also be pulled by the rope cylinder top, and since the pulling starts from the end, a two-stage pulling can be formed, so that the pulling length of the sensing rope is doubled in the limited box body. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0032] Figure 1 is a three-dimensional structure schematic diagram of a strain type tension sensor of the present application.

[0033] Figure 2 is a front view internal structure schematic diagram of a strain type tension sensor of the present application.

[0034] Figure 3It is a three-dimensional internal structure schematic diagram of a strain type tension sensor.

[0035] Figure 4 It is a control diagram of a strain type tension sensor module.

[0036] 1, box body; 11, open mouth; 12, connecting hole; 2, induction assembly; 21, support plate; 22, resistance strain gauge; 3, induction rope; 4, control module; 5, timing module; 13, mounting plate; 14, first auxiliary wheel; 15, second auxiliary wheel; 16, third auxiliary wheel; 61, motor guide rod; 62, motor; 63, guide rod; 211, extension; 212, guide groove. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] In the description of the present application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0039] Referring to Figures 1-4 A strain type tension sensor, comprising:

[0040] The box body 1 is provided with an open mouth 11 in the upper middle part, and the outer part of the box body 1 on one side of the open mouth 11 is provided with a connecting hole 12. The box body 1 is provided with an outer wheel set on the side facing the open mouth 11.

[0041] An inductive assembly 2 is arranged inside the box body 1, which includes a support plate 21, an inner wheel set rotatably mounted above the support plate 21, and a resistance strain gauge 22 mounted on the support plate 21;

[0042] An inductive rope 3 is connected at one end to the connecting hole 12, which enters from the open hole 11, surrounds the inner wheel set, and exits around the outer wheel set. The other end of the inductive rope 3 is connected to the target object.

[0043] An adjusting assembly is arranged to drive the support plate 21 to rise / fall;

[0044] A control module 4 and a timing module 5 are electrically connected to the adjusting assembly and the resistance strain gauge 22.

[0045] The accuracy of the strain type tension sensor depends largely on the accuracy of its installation. If there is an error in the installation process, such as the rope not being fully aligned or the pre-tightening force being inconsistent, it will cause deviation in the measurement results. Therefore, the control module 4 controls the adjusting assembly to drive the support plate 21 to rise / fall to adjust the thermal expansion and contraction variation of the inductive rope 3.

[0046] The timing module 5 presets a cycle trigger time, and the control module 4 controls the adjusting assembly to drive the support plate 21 to fall by a preset distance at each trigger time.

[0047] By driving the support plate 21 to rise or fall, the position of the resistance strain gauge 22 and the tensioning strength of the inductive rope 3 can be dynamically adjusted, thereby compensating for the strain changes caused by the creep of the inductive rope 3.

[0048] Through the cycle trigger time preset by the timing module 5, the control module 4 automatically adjusts the position of the support plate 21 at each trigger time point, so that the pre-tightening force of the inductive rope 3 remains consistent, thereby realizing dynamic calibration of the sensor.

[0049] The precision decline problem caused by rope creep in the prior art is solved in this scheme by dynamically adjusting the position of the support plate 21, thereby maintaining long-term measurement accuracy. The automatic calibration system reduces the frequency of human intervention and reduces errors caused by improper human operation.

[0050] Through automatic calibration, the sensor can maintain good performance under different temperatures and environmental conditions, improving reliability in complex outdoor environments. The cycle trigger mechanism of the timing module 5 ensures periodic calibration of the sensor during use, improving the reliability of the overall system.

[0051] The timing module 5 can preset different cycle trigger times according to the actual material of the sensing rope 3, and meet the needs of different application scenarios and different use frequencies.

[0052] By introducing the adjusting assembly, the control module 4 and the timing module 5, the automatic calibration and dynamic adjustment of the strain type tension sensor are realized, and the problem of precision decline caused by the creep of the sensing rope 3 is effectively solved. Compared with the prior art, the present scheme has obvious advantages in precision stability, reliability, maintenance simplicity and the like, and is particularly suitable for tension measurement applications in outdoor and complex environments.

[0053] In order to make the rope have a clear guide and support point when entering and leaving the box body 1, the alignment of the rope is ensured. The edge of the box body 1 towards the open port 11 is provided with a mounting plate 13, and the outer wheel set includes a first auxiliary wheel 14 and a second auxiliary wheel 15, and the first auxiliary wheel 14 and the second auxiliary wheel 15 are rotatably installed on the mounting plate 13.

[0054] In order to ensure that the rope can smoothly transition when entering and leaving the box body 1, reduce friction and deviation. The outer diameter distance of the farthest side of the first auxiliary wheel 14 and the second auxiliary wheel 15 is consistent with the length of the open port 11.

[0055] The inner wheel set is a third auxiliary wheel 16, the sensing rope 3 is attached above the first auxiliary wheel 14, enters from the open port 11, surrounds the third auxiliary wheel 16, and exits from the open port 11 and is attached above the second auxiliary wheel 15, and is extended and connected to the target object.

[0056] Among them, the target object is the fixed point of the other end of the sensing rope 3, and then the distance between the strain type tension sensor and the target object is monitored through the sensing rope 3. Not only can the tension be measured, but also the relative distance between the sensor and the target object can be indirectly monitored through the length change of the rope.

[0057] Since the sensing rope 3 is attached above the first auxiliary wheel 14, enters from the open port 11, surrounds the third auxiliary wheel 16, and exits from the open port 11 and is attached above the second auxiliary wheel 15, and is finally extended and connected to the target object. This path design makes the movement of the rope in the box body 1 more smooth, reducing the wear and deformation of the rope during movement.

[0058] Among them, the design of the mounting plate 13 and the auxiliary wheel ensures the alignment of the rope when entering and leaving the box body 1, reduces the measurement error caused by the deviation of the rope. And through the setting of the first auxiliary wheel 14, the third auxiliary wheel 16 and the second auxiliary wheel 15 and the cooperation with the sensing rope 3, on the one hand, it plays a buffering role, avoids subtle triggering, reduces the misidentification of small objects such as light birds, and improves the accuracy of identification.

[0059] The optimized design of the rope path reduces friction and disturbances, making the measurement results more accurate and stable. The design of the auxiliary wheel reduces direct contact between the rope and the edge of the box 1 during movement, reducing friction and wear, thereby prolonging the service life of the sensing rope 3.

[0060] The multi-point support design of the inner and outer wheel groups makes the tension distribution of the rope more uniform, reducing local stress concentration and further prolonging the service life of the rope.

[0061] The strain type tension sensor has been significantly improved in terms of rope alignment, path optimization, and wear reduction. Especially for outdoor use, it can better cope with the creep problem of the sensing rope 3 during long-term use, ensuring the accuracy and stability of the sensor, improving the reliability and service life of the system.

[0062] The auxiliary plate 23 is vertically installed above the middle of the support plate 21, which can be installed by welding, and the third auxiliary wheel 16 is rotatably installed on the auxiliary plate 24.

[0063] The support plate 21 is fixedly installed on the side of the telescopic cylinder 61, and the end of the support plate 21 away from the telescopic cylinder 61 is suspended.

[0064] In the detection state, when the sensing rope 3 between the sensor and the target object is pressed, the sensing rope 3 is taut, and the third auxiliary wheel 16 is in the middle or suspended on one side. Therefore, when the sensing rope 3 pulls the third auxiliary wheel 16, the support plate 21 deforms, driving the resistance strain gauge 22 installed above it to deform, and the change of its resistance is considered as a warning signal, which is processed by the control module 4.

[0065] Further introduce the adjusting assembly, the adjusting assembly includes a motor guide rod 61 installed in the suspended support plate 21, and a motor 62 driving the motor guide rod 61 to extend / contract, the motor 62 is fixedly installed below the box 1 outside. The motor guide rod 61 is an electric telescopic rod.

[0066] The output end of the motor 62 is connected to the motor guide rod 61 and inserted into the box 1, and the motor 62 is fixedly installed below the box 1 by bolts, mainly using detachable installation, and in special cases with special requirements for fixing strength, welding and other non-detachable installation methods can be used. The motor 62 is electrically connected with the control module 4.

[0067] When the motor guide rod 61 retracts, it will lower the support plate 21, and the third auxiliary wheel 16 will pull more sensing rope 3 into the box 1, thereby shortening the length of the external sensing rope 3, thereby strengthening the tensioning strength of the sensing rope 3.

[0068] Because the general tension sensor has limited volume, the size of the box body 1 is also limited, so that the retraction length of the sensing rope 3 is limited, and the top end of the motor guide rod 61 corresponds to the connecting hole 12, and the sensing rope 3 is bound to the top end of the motor guide rod 61.

[0069] Further, when the motor guide rod 61 is retracted, not only can the sensing rope 3 be pulled by the third auxiliary wheel 16, but also the sensing rope can be pulled by the rope cylinder top. Since the pulling starts from the end, a two-stage pulling can be formed, so that the length of the sensing rope pulled in the limited box body 1 is doubled.

[0070] The support plate 21 arranged in suspension is not easy to deviate during the lifting / lowering adjustment, so a set of extensions 211 are arranged on the side of the support plate 21 extending towards the motor guide rod 61, and a guide groove 212 is formed between the two extensions 211;

[0071] A guide rod 63 is arranged on the side of the motor guide rod 61 away from the support plate 21, the guide rod 63 is arranged parallel to the motor guide rod 61, and the two ends of the guide rod 63 are embedded in the inside of the box body 1;

[0072] The guide rod 63 is inserted into the guide groove 212.

[0073] The support plate 21 arranged in suspension is easy to be affected by lateral force during the lifting or lowering adjustment, causing deviation. In order to prevent such deviation, a set of extensions 211 are arranged on the side of the support plate 21 extending towards the motor guide rod 61, and a guide groove 212 is formed between the two extensions 211.

[0074] A guide rod 63 is arranged on the side of the motor guide rod 61 away from the support plate 21, the guide rod 63 is arranged parallel to the motor guide rod 61, and the two ends of the guide rod 63 are embedded in the inside of the box body 1. The guide rod 63 is inserted into the guide groove 212, further strengthening the guidance and support of the support plate 21.

[0075] Through the combined design of the guide groove 212 and the guide rod 63, mechanical support is provided to ensure that the support plate 21 maintains straight-line motion during the lifting or lowering process, avoiding lateral deviation and shaking. The embedded design of the guide rod 63 makes the movement of the motor guide rod 61 more accurate, reducing errors caused by the deviation or vibration of the cylinder itself.

[0076] By setting a guide groove 212 on the support plate 21 and a parallel guide rod 63 on one side of the motor guide rod 61, which is inserted into the guide groove 212, this design can effectively prevent the support plate 21 from deviating during the up or down adjustment, improving the measurement accuracy and stability of the system. At the same time, this design also simplifies the system structure, reduces wear and tear, improves response speed and environmental adaptability, making the application of strain type tension sensor in complex environment more reliable and efficient.

[0077] Because the material of the sensing rope 3 is very sensitive to temperature changes, changes in temperature will cause the rope to expand and contract, which will affect the measurement results of the sensor. Especially in outdoor or environments with large temperature changes, this effect is more pronounced.

[0078] Therefore, a temperature sensing module is also included, which is electrically connected to the control module 4. The temperature sensing module detects the external temperature and cooperates with the control module 4 to control the control adjustment assembly to drive the support plate 21 to descend by a preset distance when the external temperature rises / falls to a preset temperature. The temperature sensing module is a temperature sensor for detecting temperature changes.

[0079] By real-time monitoring of temperature changes through the temperature sensing module and automatically adjusting the position of the support plate 21 when necessary, the length change of the rope caused by temperature changes can be effectively compensated, thereby maintaining the accuracy and stability of the measurement results.

[0080] Because different materials of the sensing rope 3 have different sensitivities to temperature changes, their thermal expansion and contraction rates, as well as the influence of regional environmental factors, time aging period and degree are also different. In order to ensure the accuracy of the adjustment results, different cycle trigger times need to be preset according to the specific material properties.

[0081] Different application scenarios and use frequency have different requirements for the accuracy and stability of the sensor, so the adjustment frequency needs to be set flexibly.

[0082] By setting different cycle trigger times through the timing module 5 according to the thermal expansion and contraction characteristics of the specific sensing rope 3 material, this scheme effectively solves the measurement error problem caused by temperature changes.

[0083] For example, for a sensing rope 3 made of nylon material, if the temperature is higher than 40°, the control module 4 controls the adjustment assembly to drive the support plate 21 to move downward by 5-20mm; if the temperature is lower than -10°, the control module 4 controls the adjustment assembly to drive the support plate 21 to move upward by 5-20mm.

[0084] As set by the timing module 5, the first year is set to control the adjustment assembly drive support plate 21 down 4-5mm by the control module 4; the second year is set to control the adjustment assembly drive support plate 21 down 4-5mm by the control module 4; the first year is set to control the adjustment assembly drive support plate 21 down 5-6mm by the control module 4, and so on. And the expansion characteristics of different materials and the aging extension rate of the environment are quite different, which need to be set separately.

[0085] It should be noted that the device structure and the drawings of the utility model mainly describe the principle of the utility model, and the setting of the power mechanism, power supply system and control system of the device is not completely described in the technical principle of the design, and under the premise that the above-mentioned technical personnel in the field understand the principle of the utility model, the specific power mechanism, power supply system and control system can be clearly known, and the control mode of the application file is automatically controlled by the controller, and the control circuit of the controller can be realized by simple programming of the technical personnel in the field;

[0086] The standard parts used can be purchased from the market, and can be ordered according to the description and drawings, the specific connection mode of each part adopts the conventional screw, rivet, welding and other conventional means in the prior art, the mechanical parts and equipment adopt the conventional type in the prior art, and the components known to the technical personnel in the field, the structure and principle thereof can be known by the technical personnel in the field through the technical manual or through the conventional experimental method.

[0087] The above only describes the preferred embodiments of the utility model and is not used to limit the utility model. For technical personnel in the field, the utility model can be changed and varied. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A strain gauge tension sensor, characterized by, The utility model provides a kind of temperature sensing device, including: Box (1), the open mouth (11) is provided in the middle of the box (1) upper side, the outside of the box (1) is provided with connecting hole (12) on the side of the open mouth (11), the outer wheel group is provided in the direction of the open mouth (11) side of the box (1); Induction assembly (2) is arranged in the inside of the box (1), and the induction assembly (2) includes support plate (21), inner wheel group rotatably installed above the support plate (21) and resistance strain gauge (22) installed on the support plate (21); Induction rope (3) is bound to the connecting hole (12) at one end, the induction rope (3) is from the open mouth (11) and enters around the inner wheel group, and it is from the open mouth (11) and goes out and is connected with target around the outer wheel group; Adjusting assembly drives the support plate (21) to rise / fall; Control module (4) and timing module (5), the control module (4) is electrically connected with timing module (5), adjusting assembly, resistance strain gauge (22); The control module (4) controls adjusting assembly to drive support plate (21) to rise / fall and adjusts the thermal expansion and contraction variation of the induction rope (3); The timing module (5) is preset to trigger time in cycle, and the control module (4) controls adjusting assembly to drive the support plate (21) to fall in each trigger time and preset distance.

2. A strain gauge tension sensor according to claim 1, wherein: The edge of the box (1) is outwardly extended and provided with a mounting plate (13) in the direction of the open mouth (11) side, and the outer wheel group includes a first auxiliary wheel (14) and a second auxiliary wheel (15), the first auxiliary wheel (14) and the second auxiliary wheel (15) are rotatably installed on the mounting plate (13).

3. A strain gauge tension sensor according to claim 2, wherein: The outer diameter distance of the farthest side of the first auxiliary wheel (14) and the second auxiliary wheel (15) is consistent with the length of the open mouth (11).

4. A strain gauge tension sensor according to claim 3, wherein: The inner wheel group is a third auxiliary wheel (16), the induction rope (3) is attached above the first auxiliary wheel (14), from the open mouth (11) and enters around the third auxiliary wheel (16), and from the open mouth (11) and goes out and is attached above the second auxiliary wheel (15), and is extended and connected to the target.

5. The strain gage tension sensor of claim 1 wherein: The adjusting assembly includes a motor guide rod (61) installed in the air to fix the support plate (21), and a motor (62) driving the motor guide rod (61) to stretch / contract, and the motor (62) is fixedly installed below the outside of the box (1).

6. A strain gauge tension sensor according to claim 5, wherein: The top end of the motor guide rod (61) corresponds to the connecting hole (12), and the induction rope (3) is bound to the top end of the motor guide rod (61).

7. A strain gauge tension sensor according to claim 6, wherein: The support plate (21) is extended and provided with a group of extension parts (211) in the direction of the motor guide rod (61) side, and a guide groove (212) is formed in the middle of the two extension parts (211); A guide rod (63) is arranged on the side of the motor guide rod (61) away from the support plate (21), the guide rod (63) is arranged in parallel with the motor guide rod (61), and the guide rod (63) is embedded in the inside of the box (1) at both ends; The guide rod (63) is inserted into the guide groove (212).

8. The strain gage tension sensor of claim 1 wherein: The temperature sensing module is electrically connected with the control module (4), detects the external temperature, and cooperates with the control module (4) to control the control adjusting assembly to drive the support plate (21) to descend by a preset distance when the external temperature rises / descends to a preset temperature.

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