Pull rope fastening tester and fastening method

Abstract

The invention discloses a pull rope fastening tester and a fastening method, and belongs to the technical field of rope tension measurement and adjusting.The fastening tester comprises a first connecting piece and a second connecting piece, the first connecting piece is used for being fixed to a pull rope, and the second connecting piece is used for being connected with a ground anchor; a power execution assembly is arranged between the first connecting piece and the second connecting piece, the power execution assembly can drive the first connecting piece to move, the pull rope is fastened through the power execution assembly so as to bear pull rope pulling force transmitted at the turn buckle in the adjusting process, and a pulling force sensor is arranged on the power execution assembly. The pull rope fastening tester always bears main pulling force, only a small part of force supplementing target threshold value increment load is transferred to the turn buckle during each time of manual tightening, it is ensured that thread friction force needing to be overcome by an operator during each time of tightening is kept at a very small and constant low level, and when the turn buckle is screwed, the thread friction force can be kept at a very small and constant low level. And the turn buckle can be conveniently screwed in place.

Description

Technical Field

[0001] This invention belongs to the field of rope tension measurement and adjustment technology, and particularly relates to a rope tightening tester and tightening method. Background Technology

[0002] The preload of the guy wire / steel wire rope is the main controlling factor for the safety of guyed towers. Measuring the tension value and maintaining and tightening the guy wire / steel wire rope will play a decisive role in the subsequent safety assessment of the tower.

[0003] Currently, the main instruments used for measurement and maintenance include tension testers and force gauges plus lever hoists. Commonly used maintenance and fastening machinery includes winches.

[0004] Both instruments have obvious defects in use: (1) Defects in usage requirements: The data collection of the pull rope tension is mainly done by a tension tester, but it cannot be directly used for the maintenance of the pull rope tightening; the combination of tension gauge and lever hoist is the main component for adjusting the pull rope tension, which is not convenient to carry and use; (2) Cost and expense defects: When tightening the rope, a tension gauge and a hand-operated hoist (winch) are used. The installation requires at least 3-4 people to coordinate and cooperate. The tooling of this method is low, resulting in high on-site manual implementation costs. (3) Defects in station requirements: The station itself has limited maintenance costs, which, as a routine item in maintenance work, does not meet the station's maintenance needs.

[0005] Furthermore, existing technology involves tensioning the rope to the target tension in one go. At this point, the entire tension of the rope is completely converted into a huge axial force acting on the threaded joint of the turnbuckle. According to the law of friction, the friction force that needs to be overcome to tighten the bolt is proportional to the axial load borne by the bolt. Therefore, the operator is essentially using manpower to directly resist the tension of the entire rope system. As a result, as the bolt tightens, its effective length shortens, and the tension it bears increases. Consequently, the friction between the threads increases dramatically. This makes the tightening operation extremely strenuous in the final and most critical stage, turning it into a high-intensity physical labor. This not only puts a great strain on the operator's physical strength but also often prevents the bolt from being tightened to the theoretically designed position due to the limits of human strength.

[0006] Therefore, there is an urgent need to design a rope tightening tester and a tightening method to solve the problems mentioned above. Summary of the Invention

[0007] The purpose of this invention is to provide a rope tightening tester and tightening method, which has the advantages of reducing labor costs, improving adjustment efficiency, and having a low barrier to entry for use, thus solving the problems mentioned in the background art.

[0008] To achieve the above objectives, the specific technical solution of the present invention, a rope tightening tester and tightening method, is as follows: A rope tightening tester, wherein the bottom end of the rope is connected to a ground anchor via a turnbuckle, is characterized by comprising a first connector and a second connector. The first connector is used to fix the rope, and the second connector is used to connect to the ground anchor. A power actuation component is provided between the first and second connectors. The power actuation component can drive the first connector to move, causing the rope to loosen or tighten. The power actuation component also tightens the rope to bear the tension transmitted at the turnbuckle during adjustment. The power actuation component is equipped with a tension sensor to measure the tension applied to the rope. When the power actuation component tightens the rope to a preset target tension value, the turnbuckle is manually tightened. When the tension drops to a preset first tension threshold due to the manual tightening of the turnbuckle, the power actuation component restarts, raising the rope tension to a second tension threshold. This process is repeated until the turnbuckle fully bears the target tension value.

[0009] Furthermore, the specific number of power actuation components is two, with the fixed ends of the two power actuation components connected to the second connector, and the output ends of the two power actuation components connected to the first connector.

[0010] Furthermore, a first gap is provided between the two power actuation components, through which a pull rope fixed to the first connector passes to be connected to the ground anchor via a turnbuckle.

[0011] Furthermore, the power actuation component includes a lead screw and a rotating nut. The lead screw is connected to the first connecting member, and the rotating nut is rotatable. The rotating nut and the lead screw form a helical transmission pair. When the rotating nut rotates, the lead screw slides along a first direction to drive the first connecting member to slide along the first direction.

[0012] Furthermore, the power actuation component also includes a housing, in which the lead screw and rotating nut are both located. A slot is provided inside the housing, and the rotating nut is rotatably connected within the slot.

[0013] Furthermore, a power source is fixedly connected to the housing, and a gear is fixedly connected to the output end of the power source. A toothed assembly is fixedly connected to the arc-shaped contour of the rotating nut. The rotating nut meshes with the gear through the toothed assembly, so as to control whether the rotating nut rotates through the power source.

[0014] Furthermore, a connecting rod is fixedly connected to the end of the lead screw away from the first connecting member, and a support rod is fixedly connected to the connecting rod. A sliding groove is provided on the housing, and the support rod can slide along the sliding groove.

[0015] A method for securing a pull rope, using the aforementioned pull rope securing tester, further includes the following steps: S1. Install the rope tightening tester on the connection path between the rope and the ground anchor, and preset the target tension value for the power actuator; S2. Start the power actuator to tension the rope until the tension sensor measures the real-time tension value to reach the target tension value; S3. With the power actuator maintaining the tension of the pull rope at the target tension value, manually tighten the turnbuckle while monitoring the decrease in the tension sensor reading. S4. When the reading of the tension sensor drops to the preset first tension threshold, stop the manual tightening operation; S5. Restart the power actuator to continue tensioning the rope until the reading of the tension sensor rises from the first tension threshold to the second tension threshold; S6. With the power actuator maintaining the tension of the pull rope at the second tension threshold, continue to manually tighten the turnbuckle until the reading of the tension sensor drops back to the first tension threshold. S7. Repeat steps S5 and S6 until the turnbuckle has fully borne the target tensile force value, and the tightening is complete. S8. Control the power actuator to fully release the tension, bringing it to zero, and then remove the rope tightening tester from the rope.

[0016] Furthermore, the magnitude of the pulling force increased by the power actuation component each time is the supplementary force target threshold, which is the difference between the first pulling force threshold and the second pulling force threshold.

[0017] Furthermore, in S7, when the sum of the target force thresholds equals the first tension threshold, and the reading of the tension sensor stabilizes at the first tension threshold after manual tightening, it is determined that the turnbuckle has fully borne the target tension value, and the tightening is completed.

[0018] The present invention has the following advantages: (1) Based on the results of the field test, compared with the professional maintenance of traditional chain hoists and tension gauges, this equipment is operable and can be operated by only two people. When adjusting the tension value, the digital reading of this equipment is more objective and accurate than that of a tension gauge that requires manual interpretation. It is also more stable and operable. At the same time, the equipment has a low threshold for use, and station staff can quickly get started with it according to the operation manual.

[0019] (2) The pull rope tightening tester always bears the main pulling force, and only a small part of the supplementary force target threshold incremental load is transferred to the turnbuckle each time it is manually tightened. This ensures that the thread friction force that the operator needs to overcome each time is kept at a very small and constant low level, which saves time and effort when tightening the turnbuckle and makes it easy to tighten the turnbuckle to the correct position. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the rope fastening tester of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the rope fastening tester of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the structure of the power actuation component of the present invention; Figure 4 This is a schematic diagram of the structure of the support rod and connecting rod of the present invention; The markings in the diagram are as follows: 1. Power actuator; 11. Housing; 12. Lead screw; 13. Rotary nut; 14. Gear; 15. Power source; 16. Support rod; 17. Connecting rod; 18. Control cable socket; 19. Sensor cable socket; 2. First connector; 21. First support plate; 22. Fastening plate; 23. Slot; 24. Bolt; 3. Second connector; 31. Second support plate; 32. Pull ring; 4. Tension sensor. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0023] The following is a reference to the appendix. Figure 1 To be continued Figure 4 This invention describes a rope tightening tester and a tightening method.

[0024] Currently, the main instruments used for measurement and maintenance are tension testers and force gauges with lever hoists. Commonly used maintenance and fastening machinery includes winches. Both types of instruments have limitations in terms of usage requirements, cost, and station requirements.

[0025] Therefore, in this rope tightening tester, the bottom end of the rope is connected to the ground anchor via a turnbuckle, and the top end of the rope is connected to a guy wire tower or rooftop extension frame, etc. It includes a first connector 2 and a second connector 3. The first connector 2 is used to fix the rope, and a steel wire rope is connected to the second connector 3. The end of the steel wire rope away from the second connector 3 is connected to the ground anchor. A power actuation component 1 is provided between the first connector 2 and the second connector 3. The power actuation component 1 can drive the first connector 2 to move, so that the rope is loosened or tightened. The power actuation component 1 also tightens the rope to bear the tension of the rope transmitted at the turnbuckle during the adjustment process. A tension sensor 4 is provided on the power actuation component 1. The tension sensor 4 is used to measure the tension applied to the rope.

[0026] This pull rope tightening tester is connected in series on the pull rope and located on the pull rope between the turnbuckle and the guy wire tower. The power actuator 1 can actively contract or release, driving the first connecting piece 2 to move, thereby tightening or loosening the pull rope. During the adjustment process, the tension sensor 4 continuously monitors the tension value, while ensuring adjustment accuracy and safety. The power actuator 1 bears the tension at the turnbuckle, avoiding the safety risks of manual force required during traditional turnbuckle adjustment.

[0027] The specific number of power actuators 1 is two. The fixed ends of the two power actuators 1 are connected to the second connector 3, and the output ends of the two power actuators 1 are connected to the first connector 2. The two power actuators 1 are symmetrically arranged to distribute the load, improve the stability and durability of the equipment, and work in parallel to drive the first connector 2 synchronously to ensure that the tension adjustment process is smooth and without off-center load.

[0028] Each power actuator 1 has a rated tensile force of 25KN, and the rated tensile force of this rope tightening tester is 50KN.

[0029] A first gap is provided between the two power actuators 1. The first gap allows the pull rope, which is fixed to the first connector 2, to pass through so as to connect to the ground anchor through the turnbuckle. The first gap allows the pull rope to pass directly through this pull rope fastening tester and connect to the turnbuckle without modifying the original pull rope structure, thus adapting to existing guyed tower maintenance scenarios.

[0030] The power actuation assembly 1 includes a lead screw 12 and a rotating nut 13. The lead screw 12 is connected to the first connecting member 2, and the rotating nut 13 is rotatable. The rotating nut 13 and the lead screw 12 form a screw transmission pair. When the rotating nut 13 rotates, the lead screw 12 slides in a first direction to drive the first connecting member 2 to slide in the first direction, thereby tightening or loosening the pull rope. Specifically, the power actuation assembly 1 also includes a housing 11. The lead screw 12 and the rotating nut 13 are both located inside the housing 11. A rotating groove is provided inside the housing 11, and the rotating nut 13 is rotatably connected in the rotating groove.

[0031] The first direction is the axis direction of the lead screw 12, which is also the setting direction of this rope tightening tester.

[0032] The lead screw 12 and the rotating nut 13 are made of high-strength alloy steel and have high strength and high toughness mechanical properties after heat treatment. By adopting the sliding friction helical mechanism with mechanical self-locking characteristics of the lead screw 12 and the rotating nut 13, the tension will not disappear even if the power is lost during use, and no additional braking device is required.

[0033] Specifically, a power source 15 is fixedly connected to the housing 11, and a gear 14 is fixedly connected to the output end of the power source 15. A toothed assembly is fixedly connected to the arc-shaped contour of the rotating nut 13. The rotating nut 13 meshes with the gear 14 through the toothed assembly, so as to control whether the rotating nut 13 rotates through the power source 15, and to control the spiral direction of the rotating nut 13 through the power source 15.

[0034] The power source 15 uses a DC servo motor and a 24V and 6AH lithium battery. The DC servo motor is usually a 3000 rpm motor, which can enable the lead screw 12 to achieve a running speed of 1 mm / s.

[0035] The battery and control system are integrated and housed in a single control box.

[0036] The control box is the main control device of this rope fastening tester. The control box is equipped with a touch screen, which displays the single host tensile force, total tensile force, single host stroke and total stroke. The operating tensile force can also be set on the touch screen. When the tensile force is reached, the operation will automatically stop. It is equipped with an emergency stop function so that it can be stopped immediately in an emergency.

[0037] Each power actuation component 1 is provided with a control cable socket 18 and a sensor cable socket 19, which are connected to the control box via cables.

[0038] A connecting rod 17 is fixedly connected to the end of the lead screw 12 away from the first connecting member 2. A support rod 16 is fixedly connected to the connecting rod 17. A sliding groove is provided on the housing 11. The support rod 16 can slide along the sliding groove. Under the constraint of the connecting rod 17 and the support rod 16, the rotational motion of the rotating nut 13 is forcibly converted into the axial linear motion of the lead screw 12, preventing the lead screw 12 from rotating, ensuring that it moves strictly along the axial direction, and improving the adjustment accuracy.

[0039] The tension sensor 4 is connected in series in the force transmission path. Specifically, one end of the tension sensor 4 is fixedly connected to the support rod 16, and the other end of the tension sensor 4 is fixedly connected to the housing 11.

[0040] The first connecting member 2 includes a first support plate 21 and a fastening plate 22. The fastening plate 22 can be fastened to the first support plate 21. Both the first support plate 21 and the fastening plate 22 have through holes. After the pull rope is passed between the first support plate 21 and the fastening plate 22, the fastening plate 22 is fastened to the first support plate 21, and the through holes on the first support plate 21 and the fastening plate 22 coincide. Then, the fastening plate 22 is fixed by passing a bolt 24 through the coincident through hole. Specifically, both the first support plate 21 and the fastening plate 22 have slots 23, and the pull rope passes through the slots 23 between the first support plate 21 and the fastening plate 22.

[0041] The first support plate 21 is hinged to the output ends of the two power actuation components 1.

[0042] The second connecting member 3 includes a second support plate 31, which is hinged to the fixed end of the power actuation component 1. A pull ring 32 is connected to the end of the second support plate 31 away from the power actuation component 1, and the pull ring 32 is connected to the wire rope.

[0043] Specifically, the wire rope passes through the pull ring 32, and both ends of the wire rope are connected to shackles. The wire rope is connected to the ground anchor through the shackles. The tension at both ends of the wire rope is approximately equal. In other embodiments of the present invention, the wire rope can also be connected to the pull ring 32 by means of a buckle, as long as it can be ensured that one end of the wire rope is connected to the pull ring 32 and the other end is connected to the ground anchor.

[0044] Existing technology involves tensioning the rope to the target tension in one go. At this point, the entire tension of the rope is completely converted into a huge axial force acting on the threaded joint of the turnbuckle. According to the law of friction, the friction force that needs to be overcome to tighten the bolt is proportional to the axial load borne by the bolt. Therefore, the operator is essentially using manpower to directly resist the tension of the entire rope system. As a result, the effective length of the bolt shortens as it tightens, and the tension it bears increases. The friction between the threads increases sharply, making the tightening operation extremely strenuous in the final and most critical stage. This becomes a high-intensity physical labor, which not only puts a great strain on the operator's physical strength but also often prevents the bolt from being tightened to the theoretically designed position due to the limits of human strength.

[0045] Therefore, this rope tightening method, using the aforementioned rope tightening tester, also includes the following steps: S1. Install the rope tightening tester on the connection path between the rope and the ground anchor, and preset the target tension value for the power actuator 1; Specifically, the operator inputs the target tensile force value, such as 35kN, required by the design on the touchscreen of the control box. This value is stored in the control system as the ultimate control target for the entire process. After the equipment is connected in series, it enters a "standby" state, ready to execute the preset command.

[0046] S2. Start the power actuator 1 to tension the rope until the real-time tension value measured by the tension sensor 4 reaches the target tension value; Specifically, relying on the real-time feedback from the tension sensor 4, the equipment automatically runs to the preset target tension value, such as 35kN, and then stops immediately.

[0047] S3. With the power actuator 1 maintaining the tension of the pull rope at the target tension value, manually tighten the turnbuckle while monitoring the decrease in the reading of the tension sensor 4. Specifically, while the power actuator 1 maintains the total tension of the pull rope, the turnbuckle is manually tightened, shortening its effective thread length. This is equivalent to screwing the turnbuckle into the force-bearing system, allowing it to begin sharing part of the load. According to the principle of force balance, the tension borne by the power actuator 1 will decrease by an equal amount, resulting in a drop in sensor readings.

[0048] S4. When the reading of the tension sensor 4 drops to the preset first tension threshold, stop the manual tightening operation; Specifically, the control system continuously monitors the reading of the tension sensor 4. When the force value drops to a preset first tension threshold, such as 5kN, due to manual tightening, the control system issues a prompt or the operator stops the process after observing the instrument. At this time, the rope tightening tester bears the force of the first tension threshold, and the turnbuckle bears the force of the difference between the target tension value and the first tension threshold.

[0049] S5. Restart the power actuator 1 to continue tensioning the rope until the reading of the tension sensor 4 rises from the first tension threshold to the second tension threshold. Specifically, the control system restarts the power execution component 1, raising the tension of the pull rope from the first tension threshold to the preset second tension threshold, such as 7kN. This is equivalent to the pull rope tightening tester taking back a portion of the load from the turnbuckle, temporarily reducing the stress on the turnbuckle and decreasing the pressure between its internal and external threads, thus creating conditions for continued tightening.

[0050] S6. While the power actuator 1 maintains the tension of the pull rope at the second tension threshold, continue to manually tighten the turnbuckle until the reading of the tension sensor 4 drops back to the first tension threshold. Specifically, under a higher tension benchmark second tensile force threshold, the turnbuckle is manually tightened again. The tension borne by this pull rope fastening tester decreases again, while the tension borne by the turnbuckle increases by the same amount. When the tension drops to the first tensile force threshold again, it means that the turnbuckle has taken over the load of the supplementary force target threshold in this round.

[0051] Specifically, the target threshold for supplementary force is the difference between the first tension threshold and the second tension threshold.

[0052] S7. Repeat steps S5 and S6 until the turnbuckle has fully borne the target tensile force value, and the tightening is complete. Specifically, the pulling force of the power actuation component 1 each time is the target force threshold. When the sum of the target force thresholds each time is equal to the first pulling force threshold, and the reading of the tension sensor 4 is stable at the first pulling force threshold after manual tightening, it is determined that the turnbuckle has fully borne the target pulling force value, and the tightening is completed.

[0053] S8. Control the power actuator 1 to fully release the tension, bringing it to zero, and then remove the rope tightening tester from the rope.

[0054] Specifically, the control system controls the power actuator 1 to move in the opposite direction, slowly releasing the lead screw 12, so that the tension of the first connector 2 on the pull rope gradually returns to zero. At this time, the entire tension of the pull rope is independently and completely borne by the turnbuckle, the equipment is in a zero-load state, and can be safely dismantled.

[0055] The pull rope tightening tester always bears the main tensile force, and only a small portion of the supplementary force target threshold incremental load is transferred to the turnbuckle each time it is manually tightened. This ensures that the thread friction force that the operator needs to overcome each time is kept at a very small and constant low level, which makes it time-saving and labor-saving when tightening the turnbuckle, and makes it easy to tighten the turnbuckle to the correct position.

[0056] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A rope tightening tester, wherein the bottom end of the rope is connected to a ground anchor via a turnbuckle, characterized in that, The device includes a first connector and a second connector. The first connector is used to fix the pull rope, and the second connector is used to connect to the ground anchor. A power actuator is provided between the first connector and the second connector. The power actuator can drive the first connector to move, causing the pull rope to loosen or tighten. The power actuator also tightens the pull rope to bear the pull rope tension transmitted at the turnbuckle during the adjustment process. The power actuator is equipped with a tension sensor to measure the tension applied to the pull rope. When the power actuator tightens the pull rope to a preset target tension value, the turnbuckle is manually tightened. When it is detected that the tension drops to a preset first tension threshold due to the manual tightening of the turnbuckle, the power actuator restarts and raises the pull rope tension to a second tension threshold. This process is repeated until the turnbuckle fully bears the target tension value.

2. The rope tightening tester according to claim 1, characterized in that, The specific number of power actuators is two. The fixed ends of the two power actuators are connected to the second connector, and the output ends of the two power actuators are connected to the first connector.

3. The rope tightening tester according to claim 2, characterized in that, A first gap is provided between the two power actuators, through which a pull rope fixed to the first connector passes to be connected to the ground anchor via a turnbuckle.

4. The rope tightening tester according to any one of claims 1-3, characterized in that, The power actuation component includes a lead screw and a rotating nut. The lead screw is connected to a first connecting member, and the rotating nut is rotatable. The rotating nut and the lead screw form a helical transmission pair. When the rotating nut rotates, the lead screw slides along a first direction to drive the first connecting member to slide along the first direction.

5. The rope tightening tester according to claim 4, characterized in that, The power actuation assembly also includes a housing, in which the lead screw and rotating nut are housed. A slot is provided inside the housing, and the rotating nut is rotatably connected within the slot.

6. The rope tightening tester according to claim 4, characterized in that, A power source is fixedly connected to the housing, and a gear is fixedly connected to the output end of the power source. A toothed assembly is fixedly connected to the arc-shaped contour of the rotating nut. The rotating nut meshes with the gear through the toothed assembly, so as to control whether the rotating nut rotates through the power source.

7. The rope tightening tester according to claim 4, characterized in that, A connecting rod is fixedly connected to the end of the lead screw away from the first connecting member, and a support rod is fixedly connected to the connecting rod. A sliding groove is provided on the housing, and the support rod can slide along the sliding groove.

8. A method for securing a rope, characterized in that, Using the rope fastening tester as described in any one of claims 1-7, the method further includes the following steps: S1. Install the rope tightening tester on the connection path between the rope and the ground anchor, and preset the target tension value for the power actuator; S2. Start the power actuator to tension the rope until the tension sensor measures the real-time tension value to reach the target tension value. S3. With the power actuator maintaining the tension of the pull rope at the target tension value, manually tighten the turnbuckle while monitoring the decrease in the tension sensor reading. S4. When the reading of the tension sensor drops to the preset first tension threshold, stop the manual tightening operation; S5. Restart the power actuator to continue tensioning the rope until the reading of the tension sensor rises from the first tension threshold to the second tension threshold; S6. With the power actuator maintaining the tension of the pull rope at the second tension threshold, continue to manually tighten the turnbuckle until the reading of the tension sensor drops back to the first tension threshold. S7. Repeat steps S5 and S6 until the turnbuckle has fully borne the target tensile force value, and the tightening is complete. S8. Control the power actuator to fully release the tension, bringing it to zero, and then remove the rope tightening tester from the rope.

9. The rope fastening method according to claim 8, characterized in that, The magnitude of the pulling force increased by the power actuation component each time is the supplementary force target threshold, which is the difference between the first pulling force threshold and the second pulling force threshold.

10. The rope fastening method according to claim 9, characterized in that, In S7, when the sum of the target force thresholds equals the first tension threshold, and the reading of the tension sensor stabilizes at the first tension threshold after manual tightening, it is determined that the turnbuckle has fully borne the target tension value, and the tightening is completed.

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