Calibration device for high-strength bolt pre-tightening force sensor

Abstract

The utility model discloses a calibration device for a high-strength bolt pre-tightening force monitoring sensor. The calibration device comprises a high-strength bolt pre-tightening force detection system, a force value sensor, a hydraulic stress application system, a bolt, a wedge-shaped block, a cushion block, a pore plate and a mounting bracket structure. The high-strength bolt pre-tightening force monitoring system is connected with the pre-tightening force sensor to measure a characteristic value signal of a high-strength bolt pre-tightening force state; the force value sensor and the hydraulic jacking device are installed on the support, and the wedge block is fastened to one end of the force value sensor through threads. A to-be-calibrated high-strength bolt penetrates through the hydraulic jacking device and the force value sensor and is fixed through the pore plates at the two ends and the cushion block in the middle, the bolt is loaded through the hydraulic jacking device, and the bolt pre-tightening force sensor can be calibrated according to the mapping relation between the measured value of the force value sensor and the characteristic value measured by the high-strength bolt pre-tightening force sensor. According to the device, the calibration work of the high-strength bolt pretightening force sensor which is low in cost, easy to operate, quick and convenient can be realized.

Description

Technical Field

[0001] The utility model relates to the field of sensor calibration, in particular to a high-strength bolt preload force detection sensor calibration device. Background Art

[0002] High-strength bolts are generally used in critical load-bearing locations. Their failure can lead to failure of the structural components they connect, resulting in major safety accidents. Therefore, monitoring the preload of high-strength bolts is an important means to ensure structural safety.

[0003] Ultrasonic stress measurement is a commonly used method for monitoring the preload of high-strength bolts. Its advantages include lightweight and compact equipment, non-destructive monitoring, and convenient fastener inspection and maintenance. It also provides real-time monitoring, making it easy to establish a real-time monitoring network. Furthermore, its high measurement accuracy meets engineering measurement requirements.

[0004] Calibration of high-strength bolt preload sensors is crucial for preload monitoring accuracy. Existing methods typically utilize large-scale tensile testing machines and other equipment to load high-strength bolts. The loading force is then measured using the machine's force sensor, and the preload sensor's output signal is captured using a measuring instrument. This process establishes a correspondence between the loading force and the output signal, completing the calibration of the high-strength bolt preload sensor. This calibration process requires the use of large-scale equipment such as tensile testing machines, resulting in complex operation and high calibration costs.

[0005] The utility model designs a calibration device for a high-strength bolt preload sensor, which realizes the calibration work of the high-strength bolt preload sensor with low cost, simple operation, quickness and convenience. Utility Model Content

[0006] The utility model proposes the following technical solutions:

[0007] A calibration device for a high-strength bolt preload force sensor comprises: a high-strength bolt preload force detection system, a force value sensor, a hydraulic jacking device, bolts, wedge blocks, pads, orifice plates, and a mounting bracket structure.

[0008] The high-strength bolt preload monitoring system is connected to the preload sensor through a cable. The sensor is installed at the end of the high-strength bolt. The high-strength bolt preload sensor is used to measure the characteristic value signal representing the preload state of the high-strength bolt in real time, and transmit the characteristic value signal obtained by the measurement to the high-strength bolt preload monitoring system for processing and recording; the force sensor and the hydraulic jacking device are installed on the bracket and fixed with bolts; the force sensor is at the bottom and the hydraulic jacking device is at the top; the hydraulic jacking device can control the lifting and lowering of its lifting surface by pressurizing or unloading, and the axial force is applied to the high-strength bolt by the lifting of the hydraulic jacking device; the wedge block It is fastened to one end of the force sensor via threads. The high-strength bolt to be calibrated passes through the hydraulic jacking device and the force sensor, and is fixed by orifice plates at both ends. Since the lengths of the high-strength bolts to be calibrated vary, a spacer is required between the orifice plate and the jacking device. The spacer is designed with various thicknesses to accommodate the calibration of high-strength bolts of different lengths. Since the bolts to be calibrated are high-strength bolts, the wedge block, orifice plate, and spacer used are all made of high-strength materials. During installation, the centerlines of the bolt, orifice plate, wedge block, hydraulic jacking device, force sensor, and spacer must be aligned to ensure stable bolt force application. The bolt preload sensor can be calibrated by mapping the measured value of the force sensor to the characteristic value measured by the high-strength bolt preload sensor.

[0009] Since the stroke of the hydraulic jacking device is small, the clamping length of the bolt can be made consistent with the on-site usage by adding or removing spacers of different specifications, and there can be no visual gap between the orifice plate, wedge block, spacer, hydraulic jacking device and force sensor.

[0010] When calibrating high-strength bolts of different specifications, in addition to adding or removing spacers of different specifications, the orifice plates at both ends also need to be selected according to the specifications of the bolts. In particular, if the high-strength bolts to be calibrated are stud bolts, threaded orifice plates must be used at both ends. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The drawings and descriptions herein are provided to facilitate a further understanding of the present invention and its embodiments, constitute a part of this application, and do not constitute a limitation on the embodiments of the present invention;

[0012] Figure 1 This is a schematic diagram of the structure of the calibration device for the medium and high strength bolt preload force sensor of the utility model;

[0013] Figure 2 It is a wedge-shaped block that matches the force sensor in the utility model;

[0014] Figure 3 It is a hole plate used when calibrating M39 high-strength bolts used in the embodiment of the utility model;

[0015] Figure 4It is a spacer used when the high-strength bolt with a nominal length of 530 mm is used in the embodiment of the present invention;

[0016] In the figure, 1-orifice plate, 2-pad, 3-hydraulic jacking device, 4-force sensor, 5-wedge block, 6-mounting bracket structure, 7-high-strength bolt preload sensor, 8-high-strength bolt. DETAILED DESCRIPTION

[0017] The technical solution of the present invention will be further clearly and completely described below in conjunction with the accompanying drawings and embodiments.

[0018] In the description of the embodiment, many specific details are set forth to facilitate a full understanding of the present invention, but the protection scope of the present invention is not limited by the embodiment.

[0019] Reference Attachment Figure 1 , this embodiment realizes a high-strength bolt preload monitoring sensor calibration device. It consists of a high-strength bolt 8, a hole plate 1, a pad 2, a hydraulic jacking device 3, a force sensor 4, a wedge block 5, a high-strength bolt preload sensor 7 and a mounting bracket structure 6. The high-strength bolt preload sensor 7 is installed at the end of the high-strength bolt 8 and is connected to the high-strength bolt preload sensor monitoring system by a cable, which is used to measure the characteristic value signal representing the preload state of the high-strength bolt in real time, and process and record it; the force sensor 4 and the hydraulic jacking device 3 are installed on the bracket 6 and fixed with bolts; the wedge block 5 is fastened to one end of the force sensor 4 by a thread; in this embodiment, the M39×530 high-strength bolt 8 to be calibrated passes through the hydraulic jacking device 3 and the force sensor 4. This bolt is a double-headed bolt with a threaded hole plate 1 ( Figure 3 ) and use two spacers 2 between the upper orifice plate 1 and the lifting surface of the hydraulic jacking device 3 to ensure that there is no visible gap between the contact surfaces when the bolts are clamped at the normal length. During installation, ensure that the axes of the high-strength bolts 8, orifice plate 1, spacers 2, hydraulic jacking device 3, force sensor 4, and wedge block 5 are aligned.

[0020] In this embodiment, after all components are installed, hydraulic pressure is applied to the hydraulic jacking device 3 to jack it upward, thereby loading the high-strength bolt 8. The loading value can be measured by the force sensor 4, and the measurement value of the high-strength bolt preload sensor 7 can be recorded at the same time. In this way, through multi-point loading, a mapping relationship between the force value and the measured characteristic value can be obtained, and the calibration value of the high-strength bolt preload sensor can be obtained.

[0021] In this embodiment, two threaded orifice plates are used. Figure 3 .

[0022] In this embodiment, two pads are used. Figure 4 .

Claims

1. A high-strength bolt preload sensor calibration device, characterized in that: The device includes: a high-strength bolt preload monitoring system, a force sensor, a hydraulic jacking device, bolts, wedge blocks, pads, orifice plates, and a mounting bracket structure. The high-strength bolt preload monitoring system is connected to the high-strength bolt preload sensor via a cable, and the sensor is installed at the end of the high-strength bolt.

2. A high-strength bolt preload sensor calibration device according to claim 1, characterized in that: The force sensor and the hydraulic jacking device are installed on the bracket structure, with the force sensor at the bottom, the wedge block fastened to one end of the force sensor through threads, and the hydraulic jacking device at the top. The axial force is applied to the high-strength bolt by the jacking of the hydraulic jacking device.

3. The high-strength bolt preload sensor calibration device according to claim 1, characterized in that: High-strength bolts pass through the hydraulic jacking device and the force sensor and are fixed by the orifice plates at both ends. Pads are used to fill the space between the orifice plate and the hydraulic jacking device. The center lines of the bolts, orifice plate, wedge block, hydraulic jacking device, force sensor and pad are in a straight line.

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