Straightness testing tool structure of threaded connecting piece

Abstract

The utility model discloses a straightness testing tool structure of a threaded connecting piece, which comprises a bolt to be tested, a supporting plate and two linear sliding rails arranged at the top of the supporting plate, two sliding modules are arranged on the two linear sliding rails in a sliding manner, a profiling block I is arranged at the top of the two adjacent sliding modules, and a profiling block II is arranged at the top of the profiling block I; a second profiling block is installed at the top of the first profiling block, threaded holes matched with the tested bolt are formed in the two adjacent faces of the first profiling block and the second profiling block, and the two ends of the tested bolt are in threaded fit with the threaded holes in the two sides. A connecting assembly for connection and fixation is further arranged between the first profiling block and the second profiling block, the threaded connecting piece testing tool is designed, threaded connecting pieces of different lengths can be detected, and the threaded connecting piece testing tool is simple in structure and flexible to use.

Description

Technical Field

[0001] This utility model relates to the field of testing fixtures, and in particular to a fixture structure for testing the straightness of threaded connectors. Background Technology

[0002] Wind power generation is an important way to utilize renewable energy. Wind turbine generators typically consist of a rotor, nacelle, tower, and foundation. The connections between these components need to withstand enormous dynamic loads and complex environmental stresses.

[0003] In wind turbines, numerous bolts are used to connect critical components such as the hub and blades, and the nacelle and tower. Due to the massive size of wind turbines, components can weigh several tons or even tens of tons, and during operation, the rotor constantly rotates and vibrates with changes in wind direction and speed. For example, the bolts connecting the hub and blades must ensure the blades are stably fixed to the hub while withstanding various complex forces generated during blade rotation, such as centrifugal force, flapping force, and oscillation force. The bolts connecting the nacelle and tower must bear the weight of the entire nacelle as well as various loads caused by rotor rotation and changes in wind direction.

[0004] When a wind turbine is running, the rotor is constantly rotating. Fluctuations in wind speed and the turbulent nature of the wind cause the rotor to vibrate. The blades are typically tens or even hundreds of meters long, and this long cantilever structure generates enormous dynamic forces on the connecting parts during vibration. If the bolts are not straight, they will bear uneven loads under these dynamic forces.

[0005] For example, bent bolts connecting the hub and blades may develop fatigue cracks due to localized stress concentration during blade vibration. As the wind turbine continues to rotate and vibrate, these cracks can propagate rapidly, eventually causing the bolts to break and leading to serious accidents such as blade detachment.

[0006] The nacelle houses important equipment such as generators and gearboxes, and is quite heavy. Under wind conditions, the nacelle will sway and vibrate. The nacelle is bolted to the tower; bolts with good straightness ensure that the stress at the connection points is evenly distributed during swaying and vibration.

[0007] If the bolt straightness does not meet the requirements, excessive local compression or excessive gaps may occur during the dynamic movement of the nacelle. Excessive compression can lead to deformation of the connecting parts, while excessive gaps can cause the connection to loosen. Both of these situations will affect the stability of the nacelle, and consequently affect the power generation efficiency and safety of the entire wind turbine. Therefore, the straightness of threaded connectors needs to be tested after they are manufactured. Existing threaded connectors have threaded structures at both ends, and the two ends are connected by a connecting shaft. In actual use, the connecting shaft plays a major role in bearing the load, so it is essential to test the straightness of the connecting shaft. To address the above problems, a solution is proposed below. Utility Model Content

[0008] The purpose of this invention is to provide a tooling structure for testing the straightness of threaded connectors, so as to solve the problems mentioned in the background art.

[0009] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0010] A straightness testing fixture structure for threaded fasteners includes a bolt to be tested, a support plate, and two linear slide rails mounted on the top of the support plate. Two sliding modules are slidably arranged on each of the two linear slide rails. A first contour block is mounted on the top of each of the two adjacent sliding modules, and a second contour block is mounted on the top of the first contour block. Threaded holes that mate with the bolt to be tested are opened on the two adjacent surfaces of the first and second contour blocks. Both ends of the bolt to be tested are threaded into the threaded holes on both sides. A connecting component for connecting and fixing is also provided between the first and second contour blocks.

[0011] Preferably, the connecting assembly includes two fixing studs, two buffer springs, and two locking nuts. The two fixing studs are respectively fixed to the top two sides of the first profile block. The top of the second profile block has through holes corresponding to the fixing studs, and one end of the fixing stud passes through the through hole. The two buffer springs are respectively fixed to the top two ends of the second profile block, and the fixing stud passes through the buffer spring. The two locking nuts are respectively threaded into the top of the fixing studs. The diameter of the locking nut is larger than the width of the buffer spring. One end of the buffer spring is fixed to the top of the second profile block, and the other end of the buffer spring is a movable end, and the buffer spring is located at the bottom of the locking nut.

[0012] Preferably, a metal upright plate is installed on the side wall of the support plate, a dial indicator magnetic base is installed on the top of the metal upright plate, a dial indicator is installed on the dial indicator magnetic base, and the sensing head of the dial indicator is positioned above the bolt being measured.

[0013] Preferably, the first contour block and the sliding module are fixed together by bolts, and the first contour block and the sliding module are detachably connected by bolts.

[0014] Preferably, the sliding module has a locking bolt threaded onto its side wall, and the locking bolt abuts against the linear slide rail.

[0015] Preferably, the bottom of the support plate is equipped with a plurality of adjustable feet, each of the adjustable feet being installed at a foot on the bottom of the support plate, and each of the adjustable feet is also equipped with a rubber pad at its bottom.

[0016] Beneficial effects: When straightness testing of a bolt is required, firstly, slide the first profile block according to the length of the bolt. The first profile block moves on a linear guide rail via a sliding module at its bottom. After the two profile blocks move to the designated position, place the threaded ends of the bolt into the threaded holes of the first profile block. Install the second profile block on top of the first profile block, allowing them to engage and form a complete threaded hole. Rotate the bolt to ensure that the threaded end of the bolt engages with the threaded hole. Assemble the first and second profile blocks using a connecting assembly for easy subsequent measurement. Install the dial indicator and contact the bottom of the dial indicator with the bolt. The straightness of the bolt is then tested using the dial indicator. The structure is simple and the operation is flexible. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment;

[0018] Figure 2 This is a schematic diagram illustrating the assembly structure of the connecting component with contour block one and contour block two in an embodiment.

[0019] Figure 3 This is a schematic diagram of a partial cross-sectional structure of the connecting component and the first and second contour blocks, used as an example.

[0020] Figure 4 This is an exploded structural diagram used to illustrate the connection components in an embodiment.

[0021] Reference numerals in the attached diagram: 1. Bolt under test; 2. Support plate; 3. Linear slide rail; 4. Sliding module; 5. Copying block one; 6. Copying block two; 7. Threaded hole; 8. Connecting assembly; 81. Fixing stud; 82. Buffer spring; 83. Locking nut; 9. Metal upright plate; 10. Dial indicator magnetic base; 11. Dial indicator; 12. Adjustable support foot; 13. Rubber pad. Detailed Implementation

[0022] See Figures 1 to 4As shown, a straightness testing fixture structure for threaded fasteners includes a bolt to be tested 1, a support plate 2, and two linear slide rails 3 mounted on the top of the support plate 2. Two sliding modules 4 are slidably mounted on each of the two linear slide rails 3. A contour block 5 is mounted on the top of each of the two adjacent sliding modules 4. When straightness testing of the bolt 1 is required, the contour block 5 can be slid according to the length of the bolt 1. The contour block 5 moves on the linear slide rails 3 via the sliding modules 4 at its bottom. The contour blocks 5 on both sides can be moved to corresponding positions according to the length of the bolt 1. When shaping block 5, the distance between the two shaping blocks 5 is measured using a length measuring tool to match the length of the bolt being measured. A scale mark can be set on the linear guide rail 3 to ensure the relative position of the two shaping blocks 5. The shaping block 5 is fixed to the sliding module 4 by bolts. The shaping block 5 and the sliding module 4 are detachably connected by bolts, so that when the size of the bolt 1 being measured changes, the bolt can be removed by a wrench, thereby removing the shaping block 5 and installing different models of shaping blocks 5 on the sliding module 4.

[0023] A second profile block 6 is mounted on the top of profile block 1 5. Both ends of the bolt 1 being tested are threaded into the threaded holes 7 on both sides. The two ends of the bolt 1 being tested have a threaded structure. In order to facilitate clamping the bolt 1 being tested, threaded holes 7 that mate with the bolt 1 being tested are opened on the two adjacent surfaces of profile block 1 5 and profile block 2 6. After the two profile blocks 1 5 are moved to the designated position, the threaded ends of the bolt 1 being tested are placed in the threaded holes 7 of profile block 1 5. Then, profile block 2 6 is installed on the top of profile block 1 5. Profile block 2 6 and profile block 1 5 are matched, so that a complete threaded hole 7 can be formed to connect with the threaded structure of the bolt 1 being tested. During the process of profile block 1 5 and profile block 2 6 being matched, the bolt 1 being tested is rotated to ensure that the threaded end of the bolt 1 being tested can mate with the threaded hole 7, so as to prevent damage to the threads of the bolt 1 being tested when profile block 1 5 and profile block 2 6 are fixed later.

[0024] A connecting component 8 is provided between the first profile block 5 and the second profile block 6 to connect and fix them. After the second profile block 6 and the first profile block 5 are installed, the connecting component 8 can be used to fix the first profile block 5 and the second profile block 6, which is convenient for clamping the stud being tested.

[0025] The connecting assembly 8 includes two fixing studs 81, two buffer springs 82, and two locking nuts 83. The two fixing studs 81 are respectively fixed to the top two sides of the profile block 5. The top of the profile block 6 has through holes corresponding to the fixing studs 81, with one end of the fixing stud 81 passing through the through hole. The two buffer springs 82 are respectively fixed to the top two ends of the profile block 6, with the fixing studs 81 passing through the buffer springs 82. The two locking nuts 83 are threaded into the top of the fixing studs 81, with the diameter of the locking nuts 83 being larger than the width of the buffer springs 82. One end of the buffer spring 82 is fixed to the top of the profile block 6, and the other end of the buffer spring 82 is a movable end, located at the bottom of the locking nuts 83. When the profile block 6 is installed on the profile block 5, the two through holes of the profile block 6 can be aligned with the two fixing studs 81, and the fixing studs 81 can be passed through the holes. Through the two through holes, the two adjacent surfaces of the first profile block 5 and the second profile block 6 come into contact. The fixing stud 81 passes through the through holes and also through the two buffer springs 82. Finally, the locking nut 83 is rotated onto the fixing stud 81, and the locking nut 83 will be threaded into the fixing stud 81. The continuous rotation of the locking nut 83 on the fixing stud 81 will cause the bottom of the locking nut 83 to come into contact with the buffer spring 82. The locking nut 83 will press the buffer spring 82, and the buffer spring 82 will press the second profile block 6 in the opposite direction, realizing the fixed fit between the second profile block 6 and the first profile block 5. The setting of the buffer spring 82 makes the second profile block 6 and the first profile block 5 flexibly connected, preventing damage to the threads of the second profile block 6 when the threaded end of the stud being tested does not fit well with the threaded hole 7.

[0026] When the second profile block 6 is installed onto the first profile block 5, the fixing stud 81 passes through the through hole of the second profile block 6 and the buffer spring 82. Then, by tightening the locking nut 83, the axial force generated by the threaded engagement between the nut and the stud compresses the buffer spring 82. The reaction force generated by the buffer spring 82 presses the second profile block 6 tightly onto the first profile block 5, achieving a tight connection between the two. In this process, the buffer spring 82 plays a role in buffering and compensation. If there is a certain mismatch between the thread of the stud being tested and the threaded hole 7, the buffer spring 82 can adaptively adjust within a certain range, avoiding damage to the thread of the stud being tested caused by the hard contact between the second profile block 6 and the first profile block 5. Compared with the traditional rigid connection method, it can effectively reduce the impact of the machining error of the stud being tested or the tooling installation error on the test results, improving the accuracy and stability of the test. At the same time, this connection assembly has a simple structure, is easy to operate and maintain, and can greatly improve work efficiency and reduce production costs in actual production testing.

[0027] A metal upright plate 9 is installed on the side wall of the support plate 2. A dial indicator magnetic base 10 is installed on the top of the metal upright plate 9. A dial indicator 11 is installed on the dial indicator magnetic base 10. The measuring head of the dial indicator 11 is set above the bolt 1 to be tested. After the bolt to be tested is installed, the detection end at the bottom of the dial indicator 11 can be brought into contact with the bolt 1 to be tested. The bolt 1 can be moved by pushing it, and the detection value on the dial indicator 11 can be observed to check whether the straightness of the bolt to be tested meets the requirements.

[0028] The sliding module 4 has a locking bolt threaded on its side wall. The locking bolt abuts against the linear slide rail 3. When rapid testing is required, the sliding module can be fixed by the locking bolt. After the sliding module is fixed, the bolt 1 under test will not move. By installing multiple dial indicators 11 on the metal vertical plate 9, the endpoints of the bolt 1 under test can be detected by each dial indicator 11, thereby detecting the straightness of the bolt 1 under test.

[0029] Several adjustable feet 12 are installed at the bottom of the support plate 2. Each adjustable foot 12 is installed at the bottom of the support plate 2. A rubber pad 13 is also installed at the bottom of each adjustable foot 12. The support plate 2 is supported by the adjustable feet 12 at the bottom. By installing the rubber pad 13 at the bottom of the adjustable feet 12, the support plate 2 can be better supported and the stability of the support plate 2 can be ensured.

Claims

1. A fixture structure for testing the straightness of threaded fasteners, comprising a bolt to be tested (1), a support plate (2), and two linear slide rails (3) mounted on the top of the support plate (2), characterized in that, Two sliding modules (4) are slidably arranged on both linear slide rails (3). A first contour block (5) is installed on the top of the two adjacent sliding modules (4). A second contour block (6) is installed on the top of the first contour block (5). Threaded holes (7) that cooperate with the bolt (1) being tested are opened on the two adjacent surfaces of the first contour block (5) and the second contour block (6). Both ends of the bolt (1) being tested are threadedly engaged with the threaded holes (7) on both sides. A connecting component (8) for connecting and fixing is also provided between the first contour block (5) and the second contour block (6).

2. The straightness testing fixture structure for threaded connectors according to claim 1, characterized in that, The connecting assembly (8) includes two fixing studs (81), two buffer springs (82), and two locking nuts (83). The two fixing studs (81) are respectively fixed on the top two sides of the first contour block (5). The second contour block (6) has a through hole corresponding to the fixing studs (81) at its top. One end of the fixing stud (81) passes through the through hole. The two buffer springs (82) are respectively fixed at the top two ends of the second contour block (6). The fixing studs (81) pass through the buffer springs (82). The two locking nuts (83) are respectively threaded to the top of the fixing studs (81). The diameter of the locking nut (83) is larger than the width of the buffer spring (82). One end of the buffer spring (82) is fixed to the top of the second contour block (6). The other end of the buffer spring (82) is a movable end, and the buffer spring (82) is located at the bottom of the locking nut (83).

3. The straightness testing fixture structure for threaded connectors according to claim 1, characterized in that, A metal upright plate (9) is installed on the side wall of the support plate (2), a dial indicator magnetic base (10) is installed on the top of the metal upright plate (9), a dial indicator (11) is installed on the dial indicator magnetic base (10), and the detection head of the dial indicator (11) is set above the bolt (1) being tested.

4. The straightness testing fixture structure for threaded connectors according to claim 1, characterized in that, The contour block (5) and the sliding module (4) are fixed together by bolts, and the contour block (5) and the sliding module (4) are detachably connected by bolts.

5. The straightness testing fixture structure for threaded connectors according to claim 1, characterized in that, The sliding module (4) has a locking bolt threaded on its side wall, and the locking bolt abuts against the linear slide rail (3).

6. The straightness testing fixture structure for threaded connectors according to claim 1, characterized in that, The bottom of the support plate (2) is equipped with several adjustable feet (12), each of the adjustable feet (12) is installed at the bottom of the support plate (2), and each of the adjustable feet (12) is also equipped with a rubber pad (13).

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