A bolt elongation measurement and detection system

Abstract

The present invention provides a bolt elongation measurement and detection system, which includes a clamping tool, a hydraulic pump, a hydraulic pipeline, an ultrasonic bolt elongation measuring instrument, a portable coordinate measuring instrument and a bolt tensioner, wherein the hydraulic pump is connected to the bolt tensioner through a hydraulic pipeline, and a mounting hole is provided on the clamping tool. After the bolt to be tested passes through the inside of the mounting hole, the detection system uses a bolt tensioner to be sleeved on one end of the bolt to be tested. The present invention utilizes a monitoring system composed of a tensioner, a clamping tool, and an ultrasonic measuring instrument to achieve high-precision calibration of the bolt elongation, and find the corresponding relationship between the bolt elongation and the ultrasonic sound velocity change and the tension of the bolt puller. The bolt elongation can be quickly known only based on the pressure displayed by the bolt tensioner, and the ultrasonic measuring instrument can be used to achieve on-site rapid measurement and verification, guide the rapid installation of the bolt on-site, and the measurement process is more accurate and stable.

Description

Technical Field

[0001] The invention relates to the technical field of measurement and detection, and in particular to a bolt elongation measurement and detection system. Background Art

[0002] Bolts are common fasteners in industrial production, especially in aerospace and shipbuilding. Therefore, the quality of bolts determines the quality of products to a certain extent. The preload and elongation generated by bolts during tightening directly affect the tightening effect of bolts. Bolt elongation detection in engineering is an important method to ensure the reliability of bolt connections.

[0003] In the prior art, two methods are usually used to measure bolt elongation, including direct measurement method and strain gauge measurement method.

[0004] The direct measurement method uses a professional bolt elongation measuring instrument. Mark the bolt head and nut (or the surface of the connected part). Before and after tightening the bolt, use the instrument to directly measure the change in the distance between the marks to obtain the elongation. This method is simple and direct, but the accuracy may be affected by the measuring tool and operation. The strain gauge measurement method pastes a strain gauge on the side of the bolt. When the bolt is stretched, the resistance of the strain gauge changes. The resistance change is measured by the strain gauge and converted into a strain value, and the elongation is calculated based on the elastic modulus of the material. This method has high accuracy, but the operation is more complicated and requires professional knowledge and equipment.

[0005] In the shipbuilding field, there are some special bolts that penetrate cabins and connect in confined spaces. Direct measurement is not possible. Ultrasonic detection methods can be used to measure the elongation of the bolts. This is based on the principle that the propagation speed of ultrasound in the bolt is related to the axial force on the bolt. When the bolt is elongated by the axial force, the ultrasonic propagation time will change. The axial force and elongation are calculated by measuring the change in propagation time. This method is a non-contact measurement, but there is a problem of needing to calibrate the bolt parameters in advance. Usually, a universal testing machine and an extensometer are required for measurement. The testing machine needs to clamp the bolts during the stretching process, and the ultrasonic probe cannot be measured synchronously. The overall calibration accuracy is low. In addition, the universal testing machine is large and cannot be used at the test site, so the calibration efficiency is low. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present invention aims to provide a bolt elongation measurement and detection system to solve the problems raised in the above background technology. The present invention can realize high-precision calibration of bolt elongation. Ultrasonic measuring instruments can be used to achieve on-site rapid measurement and verification, guiding the rapid installation of bolts on-site.

[0007] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical scheme: a bolt elongation measurement and detection system, which includes a clamping tool, a hydraulic pump, a hydraulic pipeline, an ultrasonic bolt elongation measuring instrument, a portable coordinate measuring instrument and a bolt tensioner, wherein the hydraulic pump is connected to the bolt tensioner through a hydraulic pipeline, and a mounting hole is provided on the clamping tool. After the detection system passes the bolt to be measured through the inside of the mounting hole, the bolt tensioner is used to be sleeved on one end of the bolt to be measured, and the current elongation of the bolt to be measured is obtained according to the pressure displayed on the bolt tensioner provided by the hydraulic pump. The ultrasonic bolt elongation measuring instrument is used to measure, verify and guide the rapid installation of bolts.

[0008] Furthermore, a frame is installed on the top of the clamping tool, and end plates are integrally formed at both ends of the frame. A connecting rod is welded between the two end plates, and a movable baffle and a fixed baffle are respectively arranged on the inner sides of the two end plates.

[0009] Furthermore, a bottom rod is integrally formed on the inner side of the bottom of the end plate, a threaded sleeve is provided in the middle of the bottom rod, and a screw rod is inserted in the middle of the threaded sleeve.

[0010] Furthermore, a clamping plate is sleeved on the end of the screw rod, and the screw rod and the clamping plate are movably connected via a bearing. The screw rod, the clamping plate and the bottom rod are each in two in number, and the clamping plate is used to lean against two sides of the clamping tooling.

[0011] Furthermore, the clamping tool has an inverted "T"-shaped structure as a whole, and the bottom rod and the clamping plate are pressed on the surface of the clamping tool.

[0012] Furthermore, a rotating shaft is installed at one end of the movable baffle, and the movable baffle is movably connected to the surface of the end plate through the rotating shaft, and the fixed baffle is welded to the corresponding end plate surface as a whole.

[0013] Furthermore, a limiting convex plate is integrally formed on the surface of one of the end plates, and the limiting convex plate is used to provide support and limitation for the bottom of the movable baffle.

[0014] Furthermore, the ultrasonic bolt elongation measuring instrument includes an ultrasonic measuring component, and the ultrasonic measuring component includes an ultrasonic transmitting probe and an ultrasonic receiving probe.

[0015] Furthermore, a spring rod is inserted in the middle of the movable baffle, an ultrasonic transmitting probe is installed at the end of the spring rod, a pull rod is welded to the other end of the spring rod, and one end of the spring on the spring rod is fixedly connected to the surface of the movable baffle.

[0016] Furthermore, a threading tube is welded in the middle of the fixed baffle, a sleeve is welded at the end of the threading tube, an ultrasonic receiving probe is embedded on the inner wall of the sleeve, and the sleeve is used to be sleeved on the end of the bolt to be tested.

[0017] Beneficial effects of the present invention:

[0018] 1. The bolt elongation measurement and detection system utilizes a tensioner for on-site bolt installation, a clamping tool, an ultrasonic bolt elongation measuring instrument, and a portable coordinate measuring instrument to form a bolt elongation monitoring system, which can achieve high-precision calibration of the bolt elongation and find the corresponding relationship between the bolt elongation and the change of ultrasonic sound velocity and the tension of the bolt puller.

[0019] 2. When installing bolts, the bolt elongation measurement and detection system can quickly know the bolt elongation based on the pressure displayed by the bolt tensioner, and can achieve rapid on-site measurement and verification through an ultrasonic measuring instrument to guide rapid on-site installation of bolts.

[0020] 3. The bolt elongation measurement and detection system uses an ultrasonic measurement component to quickly measure and verify the stretched bolts to be tested. With the help of ultrasonic transmitting probes and ultrasonic receiving probes at both ends, accurate measurement can be achieved without disassembling the bolt tensioner, reducing interference from other structures, and can perform real-time measurement during the stretching process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of a bolt elongation measurement and detection system after assembly according to the present invention;

[0022] Figure 2 It is a connection schematic diagram of a bolt elongation measurement and detection system of the present invention;

[0023] Figure 3 It is a structural schematic diagram of the framework part of the present invention;

[0024] Figure 4 It is a structural diagram of one end of the ultrasonic transmitting probe in the ultrasonic measuring assembly of the present invention;

[0025] Figure 5 It is a structural diagram of one end of the ultrasonic receiving probe in the ultrasonic measuring assembly of the present invention;

[0026] In the figure: 1. Clamping fixture; 2. Hydraulic pump; 3. Hydraulic pipeline; 4. Ultrasonic measurement component; 5. Frame; 6. Mounting hole; 7. Bolt to be measured; 8. Bolt tensioner; 9. End plate; 10. Connecting rod; 11. Bottom rod; 12. Screw rod; 13. Clamping plate; 14. Fixed baffle; 15. Movable baffle; 16. Threading tube; 17. Housing; 18. Rotating shaft; 19. Spring rod; 20. Ultrasonic transmitting probe; 21. Pull ring; 22. Threaded sleeve; 23. Ultrasonic receiving probe; 24. Limiting convex plate. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0028] See also Figures 1 to 5 The present invention provides the following technical solutions: a bolt elongation measurement and detection system, which includes a clamping tool 1, a hydraulic pump 2, a hydraulic pipeline 3, an ultrasonic bolt elongation measuring instrument, a portable coordinate measuring instrument and a bolt tensioner 8, wherein the hydraulic pump 2 is connected to the bolt tensioner 8 through the hydraulic pipeline 3, and a mounting hole 6 is provided on the clamping tool 1. After the bolt 7 to be tested passes through the inside of the mounting hole 6, the detection system uses the bolt tensioner 8 to be sleeved on one end of the bolt 7 to be tested, and obtains the current elongation of the bolt 7 to be tested according to the pressure displayed on the bolt tensioner 8 provided by the hydraulic pump 2. The ultrasonic bolt elongation measuring instrument is used to measure, verify and guide the rapid installation of bolts. The above system can realize high-precision calibration of bolt elongation, and find the corresponding relationship between bolt elongation and ultrasonic sound velocity change and bolt puller tension.

[0029] In this embodiment, a frame 5 is installed on the top of the clamping tool 1, and end plates 9 are integrally formed at both ends of the frame 5. A connecting rod 10 is welded between the two end plates 9, and a movable baffle 15 and a fixed baffle 14 are respectively provided on the inner sides of the two end plates 9. A bottom rod 11 is integrally formed on the inner side of the bottom of the end plate 9, and a threaded sleeve 22 is provided in the middle of the bottom rod 11, and a screw rod 12 is inserted in the middle of the threaded sleeve 22. A clamping plate 13 is sleeved on the end of the screw rod 12, and the screw rod 12 and the clamping plate 13 are movably connected through a bearing. The screw rod 12, the clamping plate 13 and the bottom rod 11 are all in two numbers, and the clamping plate 13 is used to lean against the two sides of the clamping tool 1.

[0030] When the present invention is used, the bolt 7 to be tested is first passed through the mounting hole 6 on the clamping tool 1, and then the bolt tensioner 8 is sleeved on the end of the bolt 7 to be tested, and the hydraulic pump 2 is used to gradually increase the tension applied by the bolt tensioner 8 to the end of the bolt 7 to be tested, and finally the actual elongation of the current bolt 7 to be tested is determined based on the tension value.

[0031] Before the test, the ultrasonic measurement component 4 is supported by installing the frame 5, so that during the measurement process, the ultrasonic measurement component 4 can be controlled to contact the two ends of the bolt 7 to be tested respectively, and finally the elongation of the bolt 7 to be tested can be measured and verified during the stretching process and after the stretching is completed. During installation, the screw rods 12 at both ends are directly rotated, and the clamping plates 13 at the end are controlled by the screw rods 12 to press against the two sides of the clamping tool 1. The end plates 9 and the connecting rod 10 at both ends can be directly fixed by the clamping effect, and the sleeve 17 is also controlled by the process to be partially sleeved on one end of the bolt 7 to be tested. With the help of the sleeve process, when the bolt tensioner 8 is subsequently removed, it will not affect the bolt 7 to be tested.

[0032] In this embodiment, the clamping fixture 1 is an inverted "T"-shaped structure as a whole, and the bottom rod 11 and the clamping plate 13 are pressed on the surface of the clamping fixture 1. A rotating shaft 18 is installed at one end of the movable baffle 15, and the movable baffle 15 is movably connected to the surface of the end plate 9 through the rotating shaft 18, and the fixed baffle 14 is welded to the corresponding end plate 9 surface as a whole. A limiting convex plate 24 is integrally formed on the surface of one of the end plates 9, and the limiting convex plate 24 is used to provide support and limit for the bottom of the movable baffle 15. The ultrasonic bolt elongation measuring instrument includes an ultrasonic measuring component 4, and the ultrasonic measuring component 4 includes an ultrasonic transmitting probe 20 and an ultrasonic receiving probe 23. A spring rod 19 is inserted in the middle of the movable baffle 15, and an ultrasonic transmitting probe 20 is installed at the end of the spring rod 19. A pull rod is welded to the other end of the spring rod 19, and one end of the spring on the spring rod 19 is fixedly connected to the surface of the movable baffle 15. A threading tube 16 is welded in the middle of the fixed baffle 14, and a sleeve 17 is welded at the end of the threading tube 16. An ultrasonic receiving probe 23 is embedded on the inner wall of the sleeve 17, and the sleeve 17 is used to be sleeved on the end of the bolt to be tested 7. The ultrasonic measurement component 4 is used to quickly measure and verify the stretched bolt 7 to be tested, and with the help of the ultrasonic transmitting probe 20 and the ultrasonic receiving probe 23 at both ends, accurate measurement can be achieved without disassembling the bolt tensioner 8, reducing interference from other structures, and real-time measurement can be performed during the stretching process.

[0033] Specifically, by rotating the movable baffle 15 and flipping it toward the bottom, the ultrasonic transmitting probe 20 can be aligned with the central axis of the bolt tensioner 8, and the ultrasonic transmitting probe 20 can be directly pressed against one end of the bolt 7 to be tested inside the bolt tensioner 8 by means of the abutting effect of the spring rod 19. By transmitting ultrasonic signals and receiving them with the help of the ultrasonic receiving probe 23, the real-time elongation of the bolt 7 to be tested in the current state can be obtained. The bolt tensioner 8, hydraulic pump 2, ultrasonic transmitting probe 20 and ultrasonic receiving probe 23 used in the present invention are all existing mature technologies and do not belong to the protection scope of the present invention. Therefore, the internal structure and principle of this part of the equipment will not be described in detail here.

[0034] The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention.

[0035] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A bolt elongation measurement and detection system, characterized in that: The detection system includes a clamping tool, a hydraulic pump, a hydraulic pipeline, an ultrasonic bolt elongation measuring instrument, a portable coordinate measuring instrument and a bolt tensioner, wherein the hydraulic pump is connected to the bolt tensioner through a hydraulic pipeline, and a mounting hole is opened on the clamping tool. In this detection system, after the bolt to be tested passes through the inside of the mounting hole, a bolt tensioner is used to be sleeved on one end of the bolt to be tested, and the current elongation of the bolt to be tested is obtained according to the pressure displayed on the bolt tensioner provided by the hydraulic pump. The ultrasonic bolt elongation measuring instrument is used to measure, verify and guide the rapid installation of bolts.

2. A bolt elongation measurement and detection system according to claim 1, characterized in that: A frame is installed on the top of the clamping tool, and end plates are integrally formed at both ends of the frame. A connecting rod is welded between the two end plates, and a movable baffle and a fixed baffle are respectively arranged on the inner sides of the two end plates.

3. A bolt elongation measurement and detection system according to claim 2, characterized in that: A bottom rod is integrally formed on the inner side of the bottom of the end plate, a threaded sleeve is provided in the middle of the bottom rod, and a screw rod is inserted in the middle of the threaded sleeve.

4. A bolt elongation measurement and detection system according to claim 3, characterized in that: The end of the screw rod is sleeved with a clamping plate, and the screw rod and the clamping plate are movably connected through a bearing. The screw rod, the clamping plate and the bottom rod are all in two numbers, and the clamping plate is used to lean against the two sides of the clamping tooling.

5. A bolt elongation measurement and detection system according to claim 2, characterized in that: The clamping tool has an inverted "T"-shaped structure as a whole, and the bottom rod and the clamping plate are pressed on the surface of the clamping tool.

6. A bolt elongation measurement and detection system according to claim 2, characterized in that: A rotating shaft is installed at one end of the movable baffle, and the movable baffle is movably connected to the surface of the end plate through the rotating shaft, and the fixed baffle is welded to the corresponding end plate surface as a whole.

7. A bolt elongation measurement and detection system according to claim 6, characterized in that: A limiting convex plate is integrally formed on the surface of one of the end plates, and the limiting convex plate is used to provide support and limitation for the bottom of the movable baffle.

8. A bolt elongation measurement and detection system according to claim 2, characterized in that: The ultrasonic bolt elongation measuring instrument comprises an ultrasonic measuring component, and the ultrasonic measuring component comprises an ultrasonic transmitting probe and an ultrasonic receiving probe.

9. A bolt elongation measurement and detection system according to claim 8, characterized in that: A spring rod is inserted in the middle of the movable baffle, an ultrasonic transmitting probe is installed at the end of the spring rod, a pull rod is welded to the other end of the spring rod, and one end of the spring on the spring rod is fixedly connected to the surface of the movable baffle.

10. A bolt elongation measurement and detection system according to claim 9, characterized in that: A threading tube is welded in the middle of the fixed baffle, a sleeve is welded at the end of the threading tube, an ultrasonic receiving probe is embedded on the inner wall of the sleeve, and the sleeve is used to be sleeved on the end of the bolt to be tested.

Images