A method for manufacturing and using a power fitting with stepless adjustment of sag

Abstract

The application discloses a manufacturing method and a using method of a power fitting for stepless adjustment of sag, and belongs to the technical field of power fittings. The power fitting for stepless adjustment of sag comprises a double-end bolt with a rotating disc, the screw rod of the double-end bolt with the rotating disc is connected with a π-shaped nut with the rotating disc at two ends respectively, and the π-shaped nut with the rotating disc and the double-end bolt with the rotating disc are limited by a rotation blocking rod piece. The double-end bolt with the rotating disc mainly comprises a double-end bolt and a rotating disc. The double-end bolt with the rotating disc is manufactured by welding the rotating disc on the nut of the double-end bolt. The π-shaped nut with the rotating disc is installed at two ends of the screw rod of the double-end bolt. The rotation blocking rod piece is installed between the π-shaped nut with the rotating disc and the double-end bolt with the rotating disc. The application can not only greatly reduce the complexity of observation and adjustment of wire sag, but also facilitate correction of the unqualified sag found after acceptance of wire cutting.

Description

Technical Field

[0001] This invention belongs to the field of hardware fittings, and specifically relates to a method for manufacturing and using a power fitting with stepless adjustable sag. Background Technology

[0002] The sag of overhead transmission lines is a crucial indicator in line design and construction, directly impacting the safe and stable operation of the transmission lines. Therefore, ensuring the safe and stable operation of transmission lines requires not only calculating a reasonable sag size during the line design phase, but also ensuring that the installation quality of the sag meets the requirements of construction specifications during the construction phase.

[0003] Under long span conditions, the sag of power lines follows the mathematical equation of a catenary. Due to the nature of the catenary, even a small change in the length of the overhead line can cause a large change in the sag. Existing sag adjustment hardware can only adjust in increments when adjusting the line length, resulting in low precision and a tendency for the sag to be too loose or too tight, which greatly limits the construction of power lines. In mainstream overhead line construction techniques, the sag value of the erected power line needs to be observed using instruments before construction, then marks are drawn on the power line (technically called "marking" or "marking"), and finally the power line is cut to the required length (technically called "cutting") to ensure that the sag meets the accuracy requirements as much as possible. This makes the observation and adjustment of power line sag one of the most complex and time-consuming procedures in transmission line construction. Numerous papers in various academic databases introduce the principles and techniques of marking and cutting. For decades in power construction, if unqualified sag is found during the final acceptance of an overhead line, rectification work often requires significant manpower and resources to reconnect the power line and readjust the sag. For certain sections of the line where wire splicing is prohibited, it may even be necessary to scrap the existing wires and replace them with new wires.

[0004] Therefore, there is an urgent need to propose a hardware that can adjust sag and improve construction efficiency, as well as a method for manufacturing and using such hardware. Summary of the Invention

[0005] In view of the technical problems existing in the background art, the present invention provides a method for manufacturing and using a stepless adjustable sag power fitting, which can not only greatly reduce the complexity of observing and adjusting the sag of the wire, but also facilitate the correction of substandard sag found after wire cutting and acceptance.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A method for manufacturing a power fitting with stepless sag adjustment, comprising the following steps: Step 1: Determine the structure of the object to be manufactured: The object to be manufactured is a power fitting with stepless sag adjustment. The power fitting with stepless sag adjustment includes a double-ended bolt with a turntable. The two ends of the bolt with the turntable are respectively connected to a π-shaped nut with a turntable. The π-shaped nut with the turntable and the double-ended bolt with the turntable are limited by a rotation-stopping rod. The double-ended bolt with the turntable mainly includes a double-ended bolt and a turntable. Step 2: Select the diameter d of the double-ended bolt: Step 2.1: Based on the breaking tensile force N1 of the overhead transmission line and the design safety factor K of the line, obtain the actual operating tension N2; Step 2.2: After determining the safety factor K of the power fittings, obtain the tensile load value F that the power fittings are designed to withstand; Step 2.3: Based on the magnitude of the tension load value F and the material strength M of the double-ended bolt, obtain the design diameter d of the double-ended bolt; when multiple (n) electrical fittings are used in engineering applications to jointly bear the tension of the wire, the diameter d of the double-ended bolt can be reduced according to the actual distributed tension load value (F / n).

[0007] Step 3: Select the thread of the double-ended bolt: The thread should be single-threaded (pitch P equals lead S), and the thread profile half angle should not exceed 15 degrees, and the thread helix angle should not exceed 5.5 degrees; the thread of the double-ended bolt should adopt a dual-direction design, that is, with the turntable as the dividing line, the threads on both sides rotate in opposite directions, one side is right-handed and the other side is left-handed. Step 4: After selecting the required double-ended bolts, reinforce the thread: use a nitrocarburizing process to strengthen the surface material of the thread, improving its wear resistance and fatigue resistance under aerodynamic vibration; Step 5: Assemble the power fittings for stepless sag adjustment: Weld a turntable onto the nut of the double-ended bolt to create a double-ended bolt with a turntable; Install π-shaped nuts with turntables at both ends of the bolt; Install a deflector between the π-shaped nuts with turntables and the double-ended bolt with turntables.

[0008] Preferably, the sub-step of step 5 is as follows: Step 5.1: Weld a turntable onto the nut of the double-ended bolt to create a double-ended bolt with a turntable; and make a ring of holes on the turntable of the double-ended bolt with a turntable; Step 5.2: Machining a π-shaped nut with a turntable: The π-shaped nut with a turntable includes a turntable and a nut. The turntable is welded to the nut, and a hanger is welded to the turntable. The hanger is used to connect with other hardware. A socket is opened on the turntable. Step 5.3: Select a rotation-blocking rod that matches the insertion hole; the rotation-blocking rod is a bolt. Step 5.4: Make radial through holes at the ends of the double-headed bolt with turntable and the anti-rotation rod; Step 5.5: Install two π-shaped nuts with turntables at both ends of the double-ended bolt with turntables, then install the anti-rotation rod, then install the anti-loosening nut at the end of the double-ended bolt with turntables, and finally install the pin; the process is complete.

[0009] Preferably, the end of the screw is detachably provided with a pin, which is located outside the anti-loosening nut; the anti-loosening nut can prevent the π-shaped nut with a turntable from falling off due to misoperation during the adjustment of the wire sag stage; the pin has a self-locking characteristic, and will not loosen after being inserted into the pin hole, which is used to prevent the anti-loosening nut from accidentally coming off.

[0010] Preferably, the π-shaped nut with a turntable and the double-ended bolt with a turntable can achieve stepless adjustment of the wire sag through threaded engagement and displacement.

[0011] A method for using a steplessly adjustable sag electrical fitting, wherein the steplessly adjustable sag electrical fitting includes a double-ended bolt with a turntable, the two ends of the bolt with the turntable being connected to a π-shaped nut with a turntable, and the π-shaped nut with a turntable and the double-ended bolt with a turntable are limited by a rotation-stopping rod; the π-shaped nut with a turntable includes a turntable and a nut, the double-ended bolt with a turntable includes a turntable, a nut and a bolt, the turntable has a socket, and the rotation-stopping rod is adapted to the socket; the end of the bolt has an anti-loosening nut; the end of the bolt has a pin, the pin being located outside the anti-loosening nut; the turntable of the π-shaped nut with a turntable has a hanging part; the end of the rotation-stopping rod has a pin; The usage method includes the following steps: Step S1: By rotating the double-headed bolt with the turntable clockwise or counterclockwise, the relative position of the bolt and the π-shaped nuts (1) with turntables on both sides is changed, thereby adjusting the length L of the fitting. This is equivalent to changing the length of the line to adjust the sag. Step S2: Remove the anti-rotation rod that runs through the three turntables. The double-ended bolt can rotate freely clockwise or counterclockwise. When the operator rotates the π-shaped nut with the turntable clockwise, the two π-shaped nuts move closer to the center. When rotated in the opposite direction, the two π-shaped nuts with the turntable move away from each other. The anti-loosening nut acts as a limit during the movement of the π-shaped nut with the turntable, ensuring that the π-shaped nut with the turntable can only move between the center of the double-ended bolt with the turntable and the anti-loosening nut, preventing accidental dislodgement of the π-shaped nut with the turntable. The position of the anti-loosening nut can also be adjusted to change the adjustment range of the stepless adjustment hardware. The pin located on the outermost side of the double-ended bolt also acts as a limit during the movement of the anti-loosening nut, ensuring that the anti-loosening nut can only move between the pin and the π-shaped nut with the turntable, preventing accidental dislodgement of the anti-loosening nut. After adjustment, reinsert the anti-rotation rod and the pin. Step S3, Tightening the thread: 1) Remove the anti-rotation rod; 2) Rotate the double-ended bolt's turntable clockwise to reduce the length L of the fitting; 3) Tighten the anti-loosening nut; 4) Reinsert the anti-rotation rod, tighten the nut of the anti-rotation rod, and insert the pin; Step S4, Loosen the line: 1) Remove the anti-rotation rod; 2) Loosen the anti-loosening nut; 3) Rotate the double-headed bolt counterclockwise to increase the length L of the fitting, reinsert the anti-rotation rod, tighten the anti-rotation rod nut, and insert the pin.

[0012] The present invention can achieve the following beneficial effects: This power fitting provides mathematically continuous adjustment of wire sag, achieving stepless adjustment. This invention not only significantly reduces the complexity of wire sag observation and adjustment but also facilitates the correction of substandard sag discovered during post-wire cutting inspection. It improves the accuracy of sag adjustment in mainstream overhead line construction methods, reduces the technical difficulty of sag adjustment, and enhances the construction efficiency of the overhead line process. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a front view of the power fittings with continuously adjustable sag in this invention; Figure 2 This is a top view of the power fittings with continuously adjustable sag according to the present invention; Figure 3 This is a three-dimensional diagram of the power fittings for stepless sag adjustment according to the present invention. Figure 1 ; Figure 4 This is a three-dimensional diagram of the power fittings for stepless sag adjustment according to the present invention. Figure 2 ; Figure 5 This is a cross-sectional view of the power fittings for the stepless adjustable sag of the present invention; Figure 6 This is an installation effect diagram of the power fittings for the stepless adjustable sag of the present invention.

[0014] In the diagram: 1-π-shaped nut with a turntable; 2-double-ended bolt with a turntable; 3-rotation-resistant rod; 4-anti-loosening nut; 5-pin; 6-hanger; d represents the diameter of the double-ended bolt's screw; L represents the length of the fitting. Detailed Implementation

[0015] The present invention proposes a method for manufacturing a steplessly adjustable sag power fitting and a method for using a steplessly adjustable sag power fitting, which are based on the structure of the steplessly adjustable sag power fitting. For example... Figures 1 to 6As shown, the stepless adjustable sag electrical fitting includes a double-ended bolt 2 with a turntable. The two ends of the screw of the double-ended bolt 2 with the turntable are respectively connected to a π-shaped nut 1 with a turntable. The π-shaped nut 1 with the turntable and the double-ended bolt 2 with the turntable are limited by a rotation-stopping rod 3.

[0016] Specifically, the π-shaped nut 1 with a turntable includes a turntable and a nut, and the double-ended bolt 2 with a turntable includes a turntable, a nut, and a bolt. The turntable has a socket, and the anti-rotation rod 3 is adapted to the socket. The turntable is a circular disc, welded to the outer edge of the nut. The π-shaped nut 1 with a turntable has a socket on its turntable, and the double-ended bolt 2 with a turntable has a ring of sockets on its turntable.

[0017] Furthermore, the end of the screw is provided with an anti-loosening nut 4. The anti-loosening nut 4 is used to prevent the π-shaped nut 1 with the turntable from falling off.

[0018] Furthermore, a pin 5 is provided at the end of the screw, and the pin 5 is located outside the anti-loosening nut 4. The pin 5 is used to prevent the anti-loosening nut 4 from falling off. Specifically, a through hole is provided on the screw, and the through hole is radially arranged on the screw, and the pin 5 is used to be inserted into the through hole.

[0019] Furthermore, the π-shaped nut 1 with a turntable is provided with a hanger 6, which can be connected to other hardware.

[0020] Furthermore, the end of the anti-rotation rod 3 is provided with a pin 5. The anti-rotation rod 3 is a bolt, and the end of the anti-rotation rod 3 is also provided with a through hole for installing the pin 5.

[0021] The functions of each component in this invention are as follows: The π-nut with a turntable and the double-ended bolt with a turntable: These two types of nuts can achieve stepless adjustment of wire sag through threaded engagement and displacement. A vertical plate hanger is connected to the turntable of the π-nut with a turntable, which is used to connect other electrical fittings. The edge of the turntable of the π-nut with a turntable also has at least one through hole. After sag adjustment, a rotation-resistant rod passes through the through holes on both the double-ended bolt (which is one component of the double-ended bolt with a turntable) and the turntable of the π-nut with a turntable. The double-ended bolt and the rotation-resistant rod are locked together, making the stepless adjustment function of this invention ineffective due to locking, thus preventing relative rotation between the double-ended bolt and the π-nut with a turntable and preventing them from loosening. The turntable of the double-ended bolt has multiple through holes arranged in a circle around it, and holes for inserting anti-rotation rods are reserved. At the same time, the integrated design of the turntable and the double-ended bolt makes it convenient for operators to rotate the double-ended bolt and adjust the sag.

[0022] Anti-rotation rod: The anti-rotation rod not only prevents the double-ended bolt and the π-nut with a swivel from rotating relative to each other, but also bears the tensile force on the wire axis after the double-ended bolt breaks, serving as a backup. Under normal circumstances, the installed anti-rotation rod is not fastened to the swivel of the π-nut with a swivel, but can move within a small range along its own axis; that is, under normal circumstances, the anti-rotation rod does not bear the axial tensile force of the wire. When the double-ended bolt breaks, the anti-rotation rod will be forced into the π-nut with a swivel, preventing the two π-nuts with swivels from loosening, thereby ensuring that the entire power fitting string does not break. The diameter of the anti-rotation rod is determined according to the method for calculating the size of the load-bearing component of this invention.

[0023] Anti-loosening nuts and pins: Anti-loosening nuts and pins are fitted onto both ends of the double-ended bolt. The anti-loosening nut prevents the π-nut with a turntable from accidentally falling off during the adjustment of the wire sag. The pin has a self-locking feature; once inserted into the pin hole, it will not loosen, preventing the anti-loosening nut from accidentally coming out.

[0024] A method for manufacturing a power fitting with stepless sag adjustment, comprising the following steps: Step 1: Determine the structure of the object to be manufactured: The object to be manufactured is a power fitting with stepless sag adjustment. The power fitting with stepless sag adjustment includes a double-ended bolt 2 with a turntable. The two ends of the screw of the double-ended bolt 2 with the turntable are respectively connected to a π-shaped nut 1 with a turntable. The π-shaped nut 1 with the turntable and the double-ended bolt 2 with the turntable are limited by a rotation-stopping rod 3. The double-ended bolt 2 with the turntable mainly includes a double-ended bolt and a turntable. Step 2: Select the diameter d of the double-ended bolt: Step 2.1: Based on the breaking tensile force N1 of the overhead transmission line and the design safety factor K of the line, obtain the actual operating tension N2; Step 2.2: After determining the safety factor K of the power fittings, obtain the tensile load value F that the power fittings are designed to withstand; Step 2.3: Based on the magnitude of the tension load value F and the material strength M of the double-ended bolt, obtain the design diameter d of the double-ended bolt; when multiple (n) electrical fittings are used in engineering applications to jointly bear the tension of the wire, the diameter d of the double-ended bolt can be reduced according to the actual distributed tension load value (F / n).

[0025] Step 3: Select the thread of the double-ended bolt: The thread should be single-threaded (pitch P equals lead S), and the thread profile half angle should not exceed 15 degrees, and the thread helix angle should not exceed 5.5 degrees; the thread of the double-ended bolt should adopt a dual-direction design, that is, with the turntable as the dividing line, the threads on both sides rotate in opposite directions, one side is right-handed and the other side is left-handed. Step 4: After selecting the required double-ended bolts, reinforce the thread: use a nitrocarburizing process to strengthen the surface material of the thread, improving its wear resistance and fatigue resistance under aerodynamic vibration; Step 5: Assemble the power fittings for stepless sag adjustment: Weld a turntable onto the nut of the double-ended bolt to create a double-ended bolt 2 with a turntable; Install π-shaped nuts 1 with turntables at both ends of the bolt; Install a deflector rod 3 between the π-shaped nuts 1 with turntables and the double-ended bolt 2 with turntables.

[0026] Preferably, the sub-step of step 5 is as follows: Step 5.1: Weld a turntable onto the nut of the double-ended bolt to create a double-ended bolt 2 with a turntable; and make a ring of holes on the turntable of the double-ended bolt 2 with a turntable; Step 5.2: Processing the π-shaped nut 1 with a turntable: The π-shaped nut 1 with a turntable includes a turntable and a nut. The turntable is welded to the nut. A hanger 6 is welded to the turntable. The hanger 6 is used to connect with other hardware. A socket is opened on the turntable. Step 5.3: Select a rotation-blocking rod 3 that matches the insertion hole, wherein the rotation-blocking rod 3 is a bolt; Step 5.4: Make radial through holes at the ends of the double-headed bolt 2 with turntable and the anti-rotation rod 3; Step 5.5: After installing two π-shaped nuts 1 with turntables at both ends of the double-ended bolt 2 with turntables, install the anti-rotation rod 3, then install the anti-loosening nut 4 at the end of the double-ended bolt 2 with turntables, and finally install the pin (5); the process is complete.

[0027] A method for using a steplessly adjustable sag electrical fitting includes the following steps: Step S1: By rotating the double-headed bolt with the turntable clockwise or counterclockwise, the relative position of the bolt and the π-shaped nuts with turntables on both sides is changed, thereby adjusting the length L of the fitting. This is equivalent to changing the length of the line to adjust the sag. Step S2: Remove the anti-rotation rod that runs through the three turntables. The double-ended bolt can rotate freely clockwise or counterclockwise. When the operator rotates the π-shaped nut with the turntable clockwise, the two π-shaped nuts move closer to the center. When rotated in the opposite direction, the two π-shaped nuts with the turntable move away from each other. The anti-loosening nut acts as a limit during the movement of the π-shaped nut with the turntable, ensuring that the π-shaped nut with the turntable can only move between the center of the double-ended bolt with the turntable and the anti-loosening nut, preventing accidental dislodgement of the π-shaped nut with the turntable. The position of the anti-loosening nut can also be adjusted to change the adjustment range of the stepless adjustment hardware. The pin located on the outermost side of the double-ended bolt also acts as a limit during the movement of the anti-loosening nut, ensuring that the anti-loosening nut can only move between the pin and the π-shaped nut with the turntable, preventing accidental dislodgement of the anti-loosening nut. After adjustment, reinsert the anti-rotation rod and the pin. Step S3, Tightening the thread: 1) Remove the anti-rotation rod; 2) Rotate the double-ended bolt's turntable clockwise to reduce the length L of the fitting; 3) Tighten the anti-loosening nut; 4) Reinsert the anti-rotation rod, tighten the nut of the anti-rotation rod, and insert the pin; Step S4: Loosen the thread. 1) Remove the anti-rotation rod; 2) Loosen the anti-loosening nut; 3) Rotate the double-headed bolt counterclockwise to increase the length L of the fitting, reinsert the anti-rotation rod, tighten the anti-rotation rod nut, and insert the pin.

[0028] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be defined as the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A method for manufacturing a power fitting with stepless sag adjustment, characterized in that... Includes the following steps: Step 1: Determine the structure of the object to be manufactured: The object to be manufactured is a power fitting with stepless sag adjustment. The power fitting with stepless sag adjustment includes a double-ended bolt (2) with a turntable. The two ends of the screw of the double-ended bolt (2) with a turntable are respectively connected to a π-shaped nut (1) with a turntable. The π-shaped nut (1) with a turntable and the double-ended bolt (2) with a turntable are limited by a rotation-stopping rod (3). The double-ended bolt (2) with a turntable mainly includes a double-ended bolt and a turntable. Step 2: Select the diameter d of the double-ended bolt: Step 2.1: Based on the breaking tensile force N1 of the overhead transmission line and the design safety factor K of the line, obtain the actual operating tension N2; Step 2.2: After determining the safety factor K of the power fittings, obtain the tensile load value F that the power fittings are designed to withstand; Step 2.3: Based on the magnitude of the tension load F and the material strength M of the double-ended bolt, obtain the design diameter d of the double-ended bolt; Step 3: Select the thread line of the double-ended bolt: The thread line should be single-line, and the thread profile half angle should not exceed 15 degrees, and the thread helix angle should not exceed 5.5 degrees; the thread of the double-ended bolt should adopt a dual-direction design, that is, with the turntable as the dividing line, the threads on both sides rotate in opposite directions, one side is right-handed and the other side is left-handed. Step 4: After selecting the required double-ended bolts, reinforce the thread: use a nitrocarburizing process to strengthen the surface material of the thread, improving its wear resistance and fatigue resistance under aerodynamic vibration; Step 5: Assemble the power fittings for stepless sag adjustment: Weld a turntable onto the nut of the double-ended bolt to make a double-ended bolt with a turntable (2); Install the π-shaped nut (1) with the turntable at both ends of the screw of the double-ended bolt; Install the anti-rotation rod (3) between the π-shaped nut (1) with the turntable and the double-ended bolt (2) with the turntable.

2. The method for manufacturing a steplessly adjustable sag power fitting according to claim 1, characterized in that: The sub-steps of step 5 are as follows: Step 5.1: Weld a turntable onto the nut of the double-ended bolt to make a double-ended bolt (2) with a turntable; and make a ring of holes on the turntable of the double-ended bolt (2) with a turntable; Step 5.2: Processing the π-shaped nut with turntable (1): The π-shaped nut with turntable (1) includes a turntable and a nut. The turntable is welded to the nut. A hanger (6) is welded on the turntable. The hanger (6) is used to connect with other hardware. A socket is opened on the turntable. Step 5.3: Select a rotation-blocking rod (3) that matches the insertion hole, wherein the rotation-blocking rod (3) is a bolt; Step 5.4: Open radial through holes at the ends of the double-headed bolt (2) with turntable and the anti-rotation rod (3); Step 5.5: Install two π-shaped nuts (1) with turntables at both ends of the double-ended bolt (2) with turntables, then install the anti-rotation rod (3), then install the anti-loosening nut (4) at the end of the double-ended bolt (2) with turntables, and finally install the pin (5); the process is complete.

3. The method for manufacturing a steplessly adjustable sag power fitting according to claim 2, characterized in that: The end of the screw is detachably provided with a pin (5), which is located outside the anti-loosening nut (4); the anti-loosening nut (4) can prevent the π-shaped nut (1) with a turntable from falling off due to misoperation during the adjustment of the wire sag stage; the pin has a self-locking characteristic and will not loosen after being inserted into the pin hole, which is used to prevent the anti-loosening nut (4) from accidentally coming off.

4. The method for manufacturing a steplessly adjustable sag power fitting according to claim 3, characterized in that: Pi-shaped nuts with turntables and double-ended bolts with turntables can achieve stepless adjustment of wire sag through threaded engagement and displacement.

5. A method for using a power fitting with stepless adjustable sag, characterized in that: The stepless adjustable sag electrical fitting includes a double-ended bolt (2) with a turntable. The two ends of the screw of the double-ended bolt (2) with a turntable are respectively connected to a π-shaped nut (1) with a turntable. The π-shaped nut (1) with a turntable and the double-ended bolt (2) with a turntable are limited by a rotation-stopping rod (3). The π-shaped nut (1) with a turntable includes a turntable and a nut. The double-ended bolt (2) with a turntable includes a turntable, a nut and a screw. The turntable is provided with a socket. The rotation-stopping rod (3) is adapted to the socket. The end of the screw is provided with an anti-loosening nut (4). The end of the screw is provided with a pin (5). The pin (5) is located outside the anti-loosening nut (4). The turntable of the π-shaped nut (1) with a turntable is provided with a hanging part (6). The end of the rotation-stopping rod (3) is provided with a pin (5). The usage method includes the following steps: Step S1: By rotating the double-headed bolt with the turntable clockwise or counterclockwise, the relative position of the bolt and the π-shaped nuts (1) with turntables on both sides is changed, thereby adjusting the length L of the fitting. This is equivalent to changing the length of the line to adjust the sag. Step S2: Remove the anti-rotation rod that runs through the three turntables. The double-ended bolt can rotate freely clockwise or counterclockwise. When the operator rotates the π-shaped nut with the turntable clockwise, the two π-shaped nuts move closer to the center. When rotated in the opposite direction, the two π-shaped nuts with the turntable move away from each other. The anti-loosening nut acts as a limit during the movement of the π-shaped nut with the turntable, ensuring that the π-shaped nut with the turntable can only move between the center of the double-ended bolt with the turntable and the anti-loosening nut, preventing accidental dislodgement of the π-shaped nut with the turntable. The position of the anti-loosening nut can also be adjusted to change the adjustment range of the stepless adjustment hardware. The pin located on the outermost side of the double-ended bolt also acts as a limit during the movement of the anti-loosening nut, ensuring that the anti-loosening nut can only move between the pin and the π-shaped nut with the turntable, preventing accidental dislodgement of the anti-loosening nut. After adjustment, reinsert the anti-rotation rod and the pin. Step S3, Tightening the thread: 1) Remove the anti-rotation rod; 2) Rotate the double-ended bolt's turntable clockwise to reduce the length L of the fitting; 3) Tighten the anti-loosening nut; 4) Reinsert the anti-rotation rod, tighten the nut of the anti-rotation rod, and insert the pin; Step S4: Loosen the line. 1) Remove the anti-rotation rod; 2) Loosen the anti-loosening nut; 3) Rotate the double-headed bolt counterclockwise to increase the length L of the fitting, reinsert the anti-rotation rod, tighten the anti-rotation rod nut, and insert the pin.

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