Threaded fastener stretching installation equipment

Abstract

The invention discloses threaded fastener stretching installation equipment, which belongs to the technical field of threaded fastener installation, and comprises a base, a support frame, a threaded pull head, a stretching screw rod, a threaded rod and a threaded rod, the base covers the end of a to-be-stretched bolt, the threaded pull head is in threaded connection with the end of the bolt, and the support frame is installed on the base and is in threaded connection with the stretching screw rod. The bottom end of the stretching screw rod is rotationally connected with the top of the threaded puller through a rotary connecting piece, and in addition, a visual distance measuring mechanism is installed on the supporting frame. According to the technical key points, the threaded pull head does not rotate in the stretching process and can keep a static friction connection relation with the to-be-stretched bolt, almost no torsional load is applied to the to-be-stretched bolt, the connection reliability can be improved, and the arranged visual distance measuring mechanism can monitor the stretched length of the bolt in real time, so that the tensile strength of the bolt is improved. The method can help a user to clearly judge whether the current bolt stretching degree meets the stretching standard or not, and can also provide a necessary judgment basis for the user to stretch different bolts to different degrees.

Description

Technical Field

[0001] The invention relates to the technical field of threaded fastener installation, in particular to a threaded fastener stretching installation device. Background Art

[0002] Tension installation of threaded fasteners is a precision assembly method that applies axial tension to the bolt using a hydraulic tensioner, causing it to elastically elongate before locking the preload. Compared to traditional torque methods, this method directly controls bolt elongation, achieves a preload accuracy of up to ±5%, and eliminates torsional loads, significantly improving connection reliability. This technology is widely used in the installation of large-diameter, high-strength bolts in critical sectors such as nuclear and wind power. The process includes preload preparation, application of tensile force, nut locking, and final verification, ensuring simultaneous and even loading of multiple bolts, guaranteeing the long-term safe operation of the equipment.

[0003] Invention publication number CN119282680A provides a threaded fastener tensioning and installation device. Its structural components include an internally threaded sleeve, which is threadedly connected to the threaded fastener; a backing ring, which is positioned between the internally threaded sleeve and the fastener to be fastened. The backing ring houses a drive nut that rotates the drive assembly. Compared to traditional hydraulic tensioning methods, this invention utilizes the internally threaded sleeve to rotate the threaded fastener, improving the device's portability and installation efficiency while reducing its cost.

[0004] Compared with the traditional hydraulic stretching method, the above-mentioned structural form can greatly simplify the structural form and improve the convenience, installation efficiency and use cost of the device. However, during use, its working essence is to tighten the bolt by rotating the internal threaded barrel, which is manifested in that the internal threaded barrel only rotates but does not displace, and relies on the force of the thread engagement to stretch the bolt. This causes the internal threaded barrel to inevitably apply torque to the bolt when rotating and drive it to rotate to a certain extent, and the torque will gradually increase as the bolt is stretched, resulting in more significant friction between the bolt rotation and the structure to be connected, which will generate a larger torsional load. In addition, the above-mentioned device controls the magnitude of the applied tension through a force sensor, but it only serves as an alarm when the tension reaches a predetermined value. Since it is impossible to intuitively view the extent to which the bolt is stretched, the user cannot control the degree of stretching of the bolt based on actual conditions and experience, and it is relatively rigid to use. Therefore, a threaded fastener stretching and installation device is proposed to address the above problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a threaded fastener stretching and installation device, which pulls the threaded puller connected to the bolt to be stretched upward by a stretching screw, and then applies tension to the bolt to stretch it and generate a warning force. Since the threaded puller does not rotate during the stretching process, it can maintain a static friction connection relationship with the bolt to be stretched, and therefore will not apply a torsional load to the bolt to be stretched, which can improve the reliability of the connection and avoid the wear caused by rotational friction between the structure to be connected and the bolt. In addition, the provided visual distance measuring mechanism can monitor the stretched length of the bolt in real time, which can help the user clearly judge whether the current bolt stretching degree meets the stretching standard, and can also provide the user with the necessary judgment basis for performing different degrees of stretching on different bolts, solving the technical problems in the comparative technology that the internal threaded barrel will apply a torque load to the bolt to be stretched when rotating, and generate structural friction, which is not conducive to the connection stability, and cannot intuitively display the current bolt stretching degree.

[0006] The technical solution adopted by the embodiment of the present application to solve the technical problem is:

[0007] A threaded fastener stretching and installation device includes a base, a cover of which is arranged outside the end of the bolt to be stretched, a threaded puller overlapped on the top of the base, and the threaded puller is threadedly connected to the bolt end; a support frame, which is installed on the base and has a stretching screw threadedly connected thereto, and a wrench is installed on the top of the stretching screw, wherein the bottom end of the stretching screw is rotatably connected to the top of the threaded puller through a rotating connecting piece; in addition, a visual distance measuring mechanism is installed on the support frame, which is used to monitor the distance the threaded puller moves upward under the tension of the stretching screw, and can display the displacement information in real time.

[0008] In a possible implementation, the support frame includes two symmetrically arranged support rods, the tops of which are provided with a detachably connected crossbeam, the middle of the crossbeam is provided with a stretching threaded barrel, and the stretching screw is threadedly connected to the stretching threaded barrel.

[0009] In one possible implementation, the visual ranging mechanism includes a laser displacement sensor and a sensor display module, wherein the laser displacement sensor is mounted on a support rod via a mounting bracket, and the sensor display module is mounted on a crossbeam. The sensor display module includes a display screen and a signal processing board matching the laser displacement sensor, and the laser displacement sensor and the sensor display module are connected via a cable.

[0010] In a possible implementation, the rotating connector includes a barrel cover connected to the threaded pull head bolt, and a pull ring fixedly connected to the bottom end of the stretching screw, and the barrel cover and the pull ring are rotatably connected via a plane bearing provided therebetween.

[0011] In one possible implementation, the threaded pull head includes an internally threaded cylinder, the top of which is fixedly connected to a connecting disk, and a support is provided on the side of the connecting disk, on which a ranging ring is installed directly below the laser displacement sensor, and the upper end face of the ranging ring is flush with the upper end face of the connecting disk.

[0012] In one possible implementation, the base includes a bottom cylinder, a top of which is provided with a support platform for mounting a support frame, a middle portion of the support platform is provided with a convex cylinder for supporting a threaded pull head, and furthermore, symmetrically arranged nut screwing openings are provided on the side of the bottom cylinder.

[0013] In a possible implementation, a positioning guide cylinder is installed in the convex cylinder. The positioning guide cylinder includes a cylinder shell, a top end of which is provided with a limiting convex ring for supporting the connecting disk, and an inner wall of which is provided with a plurality of guide rings in sliding contact with the internal threaded cylinder.

[0014] In a possible implementation, the top end of the stretching screw is fixedly connected to a hexagonal head, and the wrench includes a shift rod, a front end of which is fixedly connected to a hexagonal retaining ring that matches the size of the hexagonal head.

[0015] In a possible implementation, a mounting hole is provided at the top of the hexagonal head, in which an anti-slip component is threadedly connected. The anti-slip component is composed of a disc and a screw, and the size of the disc is larger than that of the hexagonal head.

[0016] In summary, the present invention has the following beneficial technical effects:

[0017] The threaded fastener installation device uses a tensioning screw to pull the threaded puller connected to the bolt to be stretched upward, thereby applying tension to the bolt to stretch it and generate a warning force. Since the threaded puller does not rotate during the stretching process, it can maintain a static friction connection with the bolt to be stretched. Therefore, almost no torsional load is applied to the bolt to be stretched, which can improve the reliability of the connection. It also does not drive the tensioning bolt to rotate due to torque load, and can avoid the wear caused by rotational friction between the structure to be connected and the bolt.

[0018] In addition, the visual distance measuring mechanism can monitor the stretched length of the bolt in real time, which can help users clearly judge whether the current degree of bolt stretching meets the stretching standard, and can also provide users with the necessary judgment basis for different degrees of stretching for different bolts. Specifically, when the threaded puller moves upward under the action of tension and stretches the bolt, the laser displacement sensor can obtain its displacement change in real time, that is, the degree to which the bolt is stretched, and display it in real time through the sensor display module. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a cross-sectional view of the structure of the present invention;

[0022] Figure 3 Schematic diagram of the tensile structure of the present invention;

[0023] Figure 4 It is a schematic diagram of the local structure of the present invention;

[0024] Figure 5 Schematic diagram of the distance measurement structure of the present invention;

[0025] Figure 6 It is a schematic diagram of the wrench structure of the present invention.

[0026] In the figure: 1. Base; 11. Bottom tube; 12. Support platform; 13. Protruding tube; 14. Nut screwing mouth; 2. Threaded pull head; 21. Internal threaded tube; 22. Connecting plate; 23. Support platform; 24. Distance measuring ring; 3. Support frame; 31. Support rod; 32. Crossbeam; 33. Tensile threaded tube; 4. Tensile screw; 41. Hexagonal head; 42. Mounting hole; 5. Rotating connector; 51. Tube cover; 52. Pull ring; 53. Plane bearing; 6. Visual distance measuring mechanism; 61. Laser displacement sensor; 62. Mounting frame; 63. Sensor display module; 7. Positioning guide tube; 71. Tube shell; 72. Limiting protruding ring; 73. Guide ring; 8. Wrench; 81. Push rod; 82. Hexagonal retaining ring; 83. Anti-slip part. DETAILED DESCRIPTION

[0027] The technical solution in the embodiments of the present application is to solve the problems of the above-mentioned background technology, and the overall idea is as follows:

[0028] The present embodiment provides a threaded fastener stretching installation device, which mainly includes a stretching part and a displacement detection part. The stretching part can apply tension to the bolt, stretching it to apply pre-tightening force, and the displacement detection part can detect the length change of the stretched bolt in real time, providing a reference for the user to carry out the stretching work. Figure 1 shown.

[0029] like Figure 2 - Figure 3As shown, the stretching part mainly includes a base 1, a cover of which is arranged outside the end of the bolt to be stretched, and contacts the structure to be connected to transmit the reaction force load, and a threaded pull head 2 is overlapped on the top of the base 1, and a support frame 3 is installed on the base 1, and a stretching screw 4 is threadedly connected thereto, and a wrench 8 is installed on the top of the stretching screw 4, wherein the bottom end of the stretching screw 4 is rotatably connected to the top of the threaded pull head 2 through a rotating connector 5. When in use, the threaded pull head 2 is threadedly connected to the end of the bolt.

[0030] Among them, the support frame 3 includes two symmetrically arranged support rods 31, the top of which is provided with a detachably connected crossbeam 32, the middle of the crossbeam 32 is provided with a stretching threaded barrel 33, and the stretching screw 4 is threadedly connected to the stretching threaded barrel 33; the rotating connecting part 5 includes a barrel cover 51 bolted to the threaded pull head 2, and a pull ring 52 fixedly connected to the bottom end of the stretching screw 4, and the barrel cover 51 and the pull ring 52 are rotatably connected through a plane bearing 53 arranged therebetween.

[0031] When the stretching screw 4 is rotated by the wrench 8, since it is threadedly connected to the stretching threaded barrel 33, the stretching screw 4 moves downward or upward as a whole according to the direction of rotation. This is manifested as follows: when the overall equipment is working, the stretching screw 4 moves upward to drive the threaded puller 2 threadedly connected to the bolt to be stretched to move, and then applies tension to the bolt to stretch it and generate a warning force. During installation, the stretching screw 4 moves downward to drive the threaded puller 2 to move, making it easier to thread it with the bolt to be stretched.

[0032] Since the threaded puller 2 is rotationally connected to the stretching screw 4 through the rotating connector 5, the threaded puller 2 does not rotate during the stretching process and can maintain a static friction connection relationship with the bolt to be stretched. Therefore, almost no torsional load is applied to the bolt to be stretched, which can improve the reliability of the connection and will not drive the stretching bolt to rotate due to the torque load, which can avoid the occurrence of rotational friction and wear between the structure to be connected and the bolt.

[0033] like Figure 5 As shown, the displacement detection part mainly includes a visual distance measuring mechanism 6 installed on the support frame 3, which is used to monitor the distance that the threaded pull head 2 moves upward under the pulling force of the tensile screw 4, and can display the displacement information in real time; wherein, the visual distance measuring mechanism 6 includes a laser displacement sensor 61 and a sensor display module 63, wherein the laser displacement sensor 61 is installed on the support rod 31 through the mounting frame 62, and the sensor display module 63 is installed on the beam 32, and the sensor display module 63 includes a display screen and a signal processing board matching the laser displacement sensor 61, and the laser displacement sensor 61 and the sensor display module 63 are connected by a cable.

[0034] In summary, the set visual distance measuring mechanism 6 can monitor the length of the bolt being stretched in real time, can help the user clearly judge whether the current degree of bolt stretching meets the stretching standard, and can also provide the user with the necessary judgment basis for stretching different bolts to different degrees. Specifically, when the threaded puller 2 moves upward under the action of tension and stretches the bolt, the laser displacement sensor 61 can obtain its displacement change in real time, that is, the degree to which the bolt is stretched, and display it in real time through the sensor display module 63.

[0035] Based on the above-mentioned distance measurement method, the threaded pull head 2 includes an internal threaded barrel 21, the top of which is fixedly connected to a connecting disk 22, and a support 23 is provided on the side of the connecting disk 22, on which a distance measuring ring 24 is installed, which is located directly below the laser displacement sensor 61, and the upper end face of the distance measuring ring 24 is flush with the upper end face of the connecting disk 22. The above-mentioned structural form enables the detection plane of the laser displacement sensor 61 to remain flat, thereby ensuring the accuracy of its detection.

[0036] In order to provide a stable support for the entire device, the base 1 includes a bottom cylinder 11, a support platform 12 for mounting the support frame 3 is provided on the top, a convex cylinder 13 for supporting the threaded pull head 2 is provided in the middle of the support platform 12, and a symmetrically arranged nut screw opening 14 is opened on the side of the bottom cylinder 11. Figure 4 As shown, the nut screwing opening 14 is convenient for the user to insert the ratchet wrench into the base 1 and tighten the nut after the bolt is stretched.

[0037] In addition, in order to prevent the threaded pull head 2 and the base 1 from being offset during installation and not being coaxially arranged, which may cause eccentric bending moment during stretching, a positioning guide cylinder 7 is installed in the convex cylinder 13. The positioning guide cylinder 7 includes a cylinder shell 71, a limiting convex ring 72 for supporting the connecting disk 22 is provided on its top, and a plurality of guide rings 73 are provided on its inner wall for sliding contact with the internal thread cylinder 21, such as Figure 4 As shown, the above-mentioned structural form can play a positioning and guiding role in the installation between the threaded slider 2 and the base 1, ensuring that the two can be coaxially arranged during installation.

[0038] like Figure 6 As shown, the top end of the stretching screw 4 is fixedly connected to a hexagonal head 41, and the wrench 8 includes a shift rod 81, the front end of which is fixedly connected to a hexagonal retaining ring 82 that matches the size of the hexagonal head 41. The above-mentioned structural form can realize the quick-release and quick-install connection between the wrench 8 and the stretching screw 4, which is convenient for the assembly and use of the structure; and in order to prevent the hexagonal retaining ring 82 from separating from the hexagonal head 41 during use, a mounting hole 42 is provided at the top end of the hexagonal head 41, in which an anti-slip part 83 is threadedly connected. The anti-slip part 83 is composed of a disc and a screw, and the size of the disc is larger than the size of the hexagonal head 41. Based on the above scheme, the anti-slip part 83 can limit the displacement of the hexagonal retaining ring 82 at the end to prevent it from slipping outward and separating from the hexagonal head 41.

[0039] The use principle and use process of the present invention:

[0040] First, overlap the base 1 on the structural plane to be connected, so that it covers the outside of the bolt to be stretched, and then use the wrench 8 to twist the stretching screw 4 to rotate and lower the threaded pull head 2, so that the threaded pull head 2 is threadedly connected to the bolt to be stretched until the threaded pull head 2 fits with the base 1; then rotate the stretching screw 4 in the opposite direction to move it upward to drive the threaded pull head 2 threadedly connected to the bolt to be stretched, and then apply tension to the bolt to stretch it and generate a warning force.

[0041] Since the threaded puller 2 is rotationally connected to the stretching screw 4 through the rotating connector 5, the threaded puller 2 does not rotate during the stretching process and can maintain a static friction connection relationship with the bolt to be stretched. Therefore, almost no torsional load is applied to the bolt to be stretched, which can improve the reliability of the connection and will not drive the stretching bolt to rotate due to the torque load, which can avoid the occurrence of rotational friction and wear between the structure to be connected and the bolt.

[0042] In addition, during the above process, the visual distance measuring mechanism 6 is able to monitor the length of the bolt being stretched in real time, which can help the user clearly judge whether the current degree of bolt stretching meets the stretching standard, and can also provide the user with the necessary judgment basis for stretching different bolts to different degrees. Specifically, when the threaded puller 2 moves upward under the action of tension and stretches the bolt, the laser displacement sensor 61 can obtain its displacement change in real time, that is, the degree to which the bolt is stretched, and display it in real time through the sensor display module 63.

[0043] Finally, it should be noted that the above embodiments are merely examples for the purpose of illustrating the present invention and are not intended to limit the embodiments. Those skilled in the art will readily appreciate that other variations or modifications based on the above description are possible. It is not necessary and impossible to provide an exhaustive list of all embodiments. However, obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A threaded fastener stretching installation device, characterized in that: include: A base (1) is covered outside the end of the bolt to be stretched, and a threaded pull head (2) is overlapped on the top of the base, and the threaded pull head (2) is threadedly connected to the end of the bolt; A support frame (3) is mounted on the base (1) and is threadedly connected to a stretching screw (4), with a wrench (8) mounted on the top end of the stretching screw (4); The bottom end of the stretching screw (4) is rotatably connected to the top of the threaded pull head (2) via a rotating connector (5). In addition, a visual distance measuring mechanism (6) is installed on the support frame (3) for monitoring the distance that the threaded pull head (2) moves upward under the pulling force of the stretching screw (4) and can display the displacement information in real time.

2. The threaded fastener stretching installation device according to claim 1, characterized in that: The support frame (3) comprises two symmetrically arranged support rods (31), the tops of which are provided with a detachably connected crossbeam (32), the middle of which is provided with a stretching threaded barrel (33), and the stretching screw rod (4) is threadedly connected to the stretching threaded barrel (33).

3. The threaded fastener stretching installation device according to claim 2, characterized in that: The visual distance measurement mechanism (6) comprises a laser displacement sensor (61) and a sensor display module (63), wherein the laser displacement sensor (61) is mounted on the support rod (31) via a mounting frame (62), and the sensor display module (63) is mounted on the crossbeam (32); The sensor display module (63) includes a display screen and a signal processing board matching the laser displacement sensor (61), and the laser displacement sensor (61) and the sensor display module (63) are connected via a cable.

4. The threaded fastener stretching installation device according to claim 1, characterized in that: The rotating connecting member (5) comprises a barrel cover (51) bolted to the threaded pull head (2) and a pull ring (52) fixedly connected to the bottom end of the stretching screw (4); the barrel cover (51) and the pull ring (52) are rotatably connected via a plane bearing (53) provided therebetween.

5. The threaded fastener stretching installation device according to claim 3, characterized in that: The threaded pull head (2) comprises an internal threaded barrel (21), the top end of which is fixedly connected to a connecting disc (22), a support platform (23) is provided on the side of the connecting disc (22), and a distance measuring ring (24) is mounted on the support platform and is located directly below the laser displacement sensor (61), and the upper end surface of the distance measuring ring (24) is flush with the upper end surface of the connecting disc (22).

6. The threaded fastener stretching installation device according to claim 5, characterized in that: The base (1) includes a bottom cylinder (11), the top of which is provided with a support platform (12) for mounting a support frame (3), a convex cylinder (13) for supporting a threaded pull head (2) is provided in the middle of the support platform (12), and in addition, symmetrically arranged nut screwing openings (14) are provided on the side of the bottom cylinder (11).

7. The threaded fastener stretching installation device according to claim 6, characterized in that: A positioning guide cylinder (7) is installed in the convex cylinder (13); The positioning guide cylinder (7) comprises a cylinder shell (71), the top end of which is provided with a limiting convex ring (72) for supporting the connecting disk (22), and the inner wall of which is provided with a plurality of guide rings (73) in sliding contact with the internal thread cylinder (21).

8. The threaded fastener stretching installation device according to claim 1, characterized in that: The top end of the stretching screw (4) is fixedly connected with a hexagonal head (41); The wrench (8) comprises a shifting rod (81), the front end of which is fixedly connected to a hexagonal snap ring (82) whose size matches that of the hexagonal head (41).

9. The threaded fastener stretching installation device according to claim 8, characterized in that: The top of the hexagonal head (41) is provided with a mounting hole (42), in which an anti-slipping piece (83) is threadedly connected. The anti-slipping piece (83) is composed of a disc and a screw, and the size of the disc is larger than that of the hexagonal head (41).

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