A stringing tightener and a stringing method

Abstract

The application provides a tight rope device for stringing construction, which comprises a shell, a driving wheel, a guide rope wheel, a motor and an automatic gear shifter. The driving wheel is rotatably arranged on the shell, and the motor is in transmission connection with the driving wheel. The driving wheel is provided with at least two driving grooves with different specifications in parallel along the axial direction. The guide rope wheel is arranged on the shell and guides the rope to enter and exit the driving wheel. The guide rope wheel is provided with guide rope grooves corresponding to the driving grooves. The automatic gear shifter is arranged on the rope entering side of the driving wheel, limits the rope and moves the rope to the driving groove and the guide rope groove corresponding to the current rope diameter when the rope diameter changes. The automatic gear shifter triggered by the knot realizes the continuous tight rope ability of automatically moving the rope to switch the gear position when the knot passes and automatically resetting and locking after the knot passes, and improves the continuity of the tight rope operation.

Description

Technical Field

[0001] This invention belongs to the technical field of overhead line construction equipment, specifically a rope tensioner and overhead line construction method. Background Technology

[0002] In the construction of overhead transmission lines, the tightening and tensioning of ropes is a key step in controlling the sag of the line, ensuring the safe distance between the conductor and the ground and the crossing distance, and determining the operating tension of the line. The quality of rope tightening directly affects the electrical and mechanical safety of the line after it is completed.

[0003] Line stringing construction typically employs a tiered deployment and step-by-step traction method, with the ends of ropes at each level connected by knots or connectors, gradually transitioning from thin to thick. For example, in the laying of a 500kV four-split conductor, the diameters of the guide ropes at each level are Φ3.5mm, Φ10mm, Φ15mm, and Φ26mm, respectively. As the diameter increases, the working tension required to tighten the rope also increases progressively from tens of kilograms to hundreds of kilograms. Therefore, the rope tightening equipment needs to be able to accommodate ropes with varying diameters and increasing tensions, and multiple connected sections, in a single continuous operation, while ensuring that knots can be passed through and the operation continues without interruption.

[0004] Currently, hand-held tractors or winches are commonly used as power equipment for tensioning cables at overhead power line construction sites. While these devices can provide sufficient tension, they are large and heavy, making them cumbersome to carry, transport, and deploy in complex terrains such as mountainous areas, cities, and railways, increasing the complexity and difficulty of construction. Furthermore, their output speed and traction force are essentially fixed, making it difficult to flexibly adjust as the cable diameter changes from thin to thick. This limits their adaptability and efficiency, as they cannot simultaneously meet the different demands of higher traction speeds for thinner cables and greater traction forces for thicker cables.

[0005] In rope pulling equipment, compared to hand tractors and winches, small rope tightening devices such as ratchet tensioners, lever hoists, and rope climbers have advantages such as small size, simple structure, and ease of carrying. However, these devices are mostly manually operated or only suitable for short-distance traction, with limited single-stroke travel, requiring repeated tensioning and resetting, making it difficult to achieve continuous rope tightening operations over long distances and on multiple rope segments. Their working tension is usually only used to tighten ropes of a single diameter and specification, making it difficult to cover the tens to hundreds of kilograms of tension required for guide rope tightening and the needs of long-term continuous operation. In addition, the internal structure of these devices is relatively compact, and the rope passage is narrow, making it difficult to accommodate ropes of different diameters passing through continuously in a single operation without stopping the machine. Especially when adjacent rope segments are connected by knots, the knots often cannot pass through smoothly, requiring the machine to be stopped for adjustment or equipment replacement. Summary of the Invention

[0006] The purpose of this invention is to provide a rope tensioner and a rope stringing method that simultaneously meets the requirements of increasing diameter, increasing tension, and allowing knots to pass through during continuous rope tensioning operations.

[0007] The present invention provides a rope tensioner for overhead line construction, comprising a housing, a drive wheel, a guide wheel, a motor, and an automatic shifter; the drive wheel is rotatably mounted on the housing, and the motor is connected to the drive wheel for transmission; the drive wheel has at least two drive grooves of different specifications arranged side by side along its axial direction; the guide wheel is mounted on the housing and guides the rope in and out of the drive wheel; the guide wheel has guide grooves corresponding to each drive groove; the automatic shifter is located on the rope entry side of the drive wheel, limits the rope, and shifts the rope to the drive groove and guide groove corresponding to the current rope diameter when the rope diameter changes.

[0008] In one embodiment of the aforementioned rope tensioner, the automatic shifter includes a guide rail, a gantry, a door leaf, a torsion spring, a pretension spring, a first-position limit bolt, and a second-position limit bolt; the guide rail is fixed to the housing; the gantry is slidably mounted on the guide rail; the door leaf is hinged to the gantry; the torsion spring connects the door leaf and the gantry respectively; one end of the pretension spring is connected to the gantry and the other end is connected to the housing; the first-position limit bolt and the second-position limit bolt are fixed to the guide rail at intervals.

[0009] In one embodiment of the above-mentioned rope tensioner, the gantry is C-shaped, with its bottom end slidably mounted on the guide rail; the top of the gantry is provided with a gantry mounting seat, the top of the door leaf is provided with a door leaf mounting seat, and the two ends of the torsion spring are respectively connected to the door leaf mounting seat and the gantry mounting seat; a door leaf guide roller is installed on the door leaf, a gantry guide roller is installed on the gantry, and an upper guide roller and a lower guide roller are respectively installed on the upper and lower parts of the gantry.

[0010] In one embodiment of the above-mentioned rope tensioner, the lower part of the gantry is provided with a gantry lower mounting seat, one end of the pre-tension spring is connected to the gantry lower mounting seat and the other end is connected to the inside of the housing, and the pre-tension spring is in a pre-stretched state; the lower part of the door leaf is provided with a door leaf lower mounting seat, and the door leaf lower mounting seat is provided with an extended limiting post head. When the door leaf is closed, the limiting post head abuts against the first-position limiting bolt or the second-position limiting bolt.

[0011] In one embodiment of the above-mentioned rope tensioner, the drive wheel is a double drive wheel with two V-shaped grooves, one narrow and one wide. The narrow V-shaped groove pulls a thin rope with a smaller diameter, and the wide V-shaped groove pulls a thick rope with a larger diameter. Each V-shaped groove has wedge-shaped teeth of varying heights. The drive wheel is made of a porous material.

[0012] In one embodiment of the above-mentioned rope tensioner, the rope guide wheel includes an inlet double rope guide wheel and an outlet double rope guide wheel, which are respectively arranged on the rope inlet side and the rope outlet side of the drive wheel; each rope guide wheel is provided with two U-shaped grooves, one narrow and one wide, the narrow U-shaped groove supports thin ropes with a smaller diameter, and the wide U-shaped groove supports thick ropes with a larger diameter; the rope guide wheel is made of a porous material.

[0013] In one embodiment of the above-mentioned rope tensioner, a dustproof plate is also provided on one side of the housing.

[0014] In one embodiment of the above-mentioned rope tensioner, a handle is also fixedly connected to the outside of the housing.

[0015] In one embodiment of the above-mentioned rope tensioner, a drive controller electrically connected to the motor is also included; the output shaft of the motor is connected to the drive wheel via a key.

[0016] A method for stringing cables using the aforementioned tensioner includes the following steps:

[0017] S1. Pass the thin rope to be pulled through the automatic shifter, the guide wheel and the groove on the drive wheel corresponding to the first gear in sequence;

[0018] S2. Start the motor. The motor drives the drive wheel to rotate, and pulls the thin rope continuously through the tensioner along its length in the first gear.

[0019] S3. When the knot at the end of the thin rope, which is used to connect to the thick rope, is pulled to the automatic shifter, the knot triggers the automatic shifter to release the limit and moves the knot and the thick rope to the next gear, so that the thick rope enters the drive groove and guide groove corresponding to the next gear.

[0020] S4. After the knot and the thick rope pass through the automatic shifter, the automatic shifter resets and locks, and the thick rope is stabilized in the next gear working position. The drive wheel continues to pull the thick rope in that gear.

[0021] During continuous operation, by repeating steps S2 to S4, multiple sections of rope with varying diameters connected by knots can be pulled sequentially without stopping the machine.

[0022] The beneficial effects of this invention are as follows:

[0023] 1. The automatic shifter triggered by the knot takes advantage of the natural feature that ropes of all levels are connected by knots in the construction of overhead lines. It realizes the ability to automatically shift the rope to switch gears when the knot passes and automatically reset and lock after the knot passes without stopping the machine. This eliminates the bottleneck of the process of stopping to adjust or replace equipment due to changes in rope diameter in traditional rope tightening operations, and improves the continuity and automation of rope tightening operations.

[0024] 2. By using a multi-drive wheel and a multi-guide wheel to form a multi-gear structure, the high linear speed requirement for tightening thin ropes and the high tensile force requirement for tightening thick ropes are both taken into account under constant motor power. This allows a single device to cover all stages of rope tightening operations in overhead line construction, from Φ3.5mm to Φ26mm in diameter and from tens of kilograms to hundreds of kilograms in tensile force, thus improving the adaptability of the rope tightening equipment and its overall operational efficiency. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention.

[0026] Figure 2 for Figure 1 A schematic diagram of the internal structure of the device.

[0027] Figure 3 for Figure 2 A schematic diagram of the drive wheel structure.

[0028] Figure 4 for Figure 2 A schematic diagram of the structure of the central guide rope pulley.

[0029] Figure 5 for Figure 2 A schematic diagram of the automatic gear shifter.

[0030] Figure 6 for Figure 5 A schematic diagram of the automatic gear shifter's working process.

[0031] Figure 7 for Figure 5 A schematic diagram showing the state of the automatic transmission when it is in first gear for traction.

[0032] Figure 8 for Figure 5 A schematic diagram of the automatic shifter's state when the knot passes through the automatic shifter.

[0033] Figure 9 for Figure 5 A schematic diagram showing the state of the automatic shifter when it is in second gear for traction. Detailed Implementation

[0034] The relevant technical solutions will now be clearly and completely described with reference to the accompanying drawings of the embodiments of the present invention. The described embodiments are only a part of the embodiments, not all of the 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.

[0035] like Figure 1 and Figure 2As shown, the automatic shifting rope tensioner for overhead line construction disclosed in this embodiment includes a dustproof plate 1, a housing 2, an automatic shifter 3, an inlet double guide rope wheel 4, a handle 5, an outlet double guide rope wheel 6, a double drive wheel 7, a motor 8, and a drive controller 9.

[0036] The housing 2 is the main support component of the tensioner. On the one hand, it protects the motor 8, drive controller 9 and related circuits, and on the other hand, it provides a mounting base for the other components.

[0037] A dustproof plate 1 is installed on the side of the housing 2 where the guide rope wheel and drive wheel are located, to prevent dust and debris from entering the wheel assembly inside the housing. The handle 5 is fixed to the outside of the housing by bolts, facilitating manual handling and operation of the rope tensioner.

[0038] The motor 8 is fixedly installed inside the housing 2. The output shaft of the motor is connected to the double drive wheel 7 via a key, providing the initial power for the operation of the rope tensioner. The drive controller 9 is located near the motor 8 and is electrically connected to the motor to control its power and speed.

[0039] like Figure 3 As shown, the dual drive wheel 7 is used to directly pull the rope. Its outer circumference has two V-shaped grooves, one narrow and one wide: a narrow V-shaped groove 71 and a wide V-shaped groove 72. The narrow V-shaped groove is used to pull the thinner rope 10 with a smaller diameter in the first gear position, while the wide V-shaped groove is used to pull the thicker rope 12 with a larger diameter in the second gear position. Each V-shaped groove has staggered wedge-shaped teeth to increase the friction on the rope. The dual drive wheel 7 is made of a porous 3D-printed material to increase friction while reducing weight.

[0040] like Figure 4 As shown, the inlet double guide pulley 4 and the outlet double guide pulley 6 are respectively arranged on the rope entry side and rope exit side of the double drive pulley 7 to guide the rope smoothly into and out of the tensioner and ensure that the rope is in full contact with the V-shaped grooves of the corresponding stops on the double drive pulley. Both the inlet double guide pulley 4 and the outlet double guide pulley 6 are made of porous 3D printing material. Each guide pulley has two U-shaped grooves, one narrow and one wide, namely the narrow U-shaped groove 41 and the wide U-shaped groove 42. The narrow U-shaped groove corresponds to the first stop and is used to support the thinner rope 10 with a smaller diameter, while the wide U-shaped groove corresponds to the second stop and is used to support the thicker rope 12 with a larger diameter.

[0041] The automatic shifter 3 is located in front of the entrance double guide pulley 4 in the rope entry direction. It is used to initially limit the rope's travel position and automatically shift the rope as its diameter increases. For example... Figure 5As shown, the automatic shifter includes a guide rail 31, a second-gear limit bolt 32, a first-gear limit bolt 33, a lower door leaf mounting base 34, a door leaf 35, a door leaf guide roller 36, an upper door leaf mounting base 37, a torsion spring 38, an upper gantry mounting base 39, an upper guide roller 310, a gantry 311, a gantry guide roller 312, a lower guide roller 313, a lower gantry mounting base 314, and a preload spring 315.

[0042] The guide rail 31 is fixedly installed on the housing 2, serving as the sliding track for the automatic gear shifter 3. The second gear limit bolt 32 and the first gear limit bolt 33 are fixedly installed on the guide rail 31 at intervals, wherein the second gear limit bolt 32 corresponds to the limit position of the second gear, and the first gear limit bolt 33 corresponds to the limit position of the first gear.

[0043] The gantry 311 is approximately C-shaped, with its bottom end slidably mounted on the guide rail 31, allowing it to slide back and forth along the guide rail. The door leaf 35 is hinged to the gantry, and the door leaf and the gantry together form a portal-shaped passage for ropes to pass through.

[0044] A gantry mounting base 39 is provided at the top of the gantry 311, and a door leaf mounting base 37 is provided at the top of the door leaf 35; the two ends of the torsion spring 38 are connected to the door leaf mounting base and the gantry mounting base respectively, and the torsion spring provides the door leaf with a restoring force to keep it closed with the gantry.

[0045] The lower mounting base 34 of the door leaf is fixedly connected to the lower part of the door leaf 35, and a protruding limiting post is provided on the lower mounting base of the door leaf.

[0046] The lower mounting base 314 of the gantry is fixedly connected to the lower part of the gantry 311. One end of the pretension spring 315 is fixedly connected to the lower mounting base of the gantry, and the other end is fixedly connected to the inside of the housing 2. The pretension spring is pre-stretched and is in a limit energy storage state.

[0047] Door leaf guide roller 36 is installed on door leaf 35, gantry guide roller 312 is installed on gantry 311, upper guide roller 310 and lower guide roller 313 are installed on the upper and lower parts of gantry 311 respectively, and the guide rollers together form a guide channel for the rope to pass through, ensuring that the rope passes smoothly through the automatic shifter 3.

[0048] According to the functional division, the automatic shifter 3 contains four functional mechanisms: a gantry rope mechanism, a door opening mechanism, a sliding mechanism, and a stepping limit mechanism.

[0049] The gantry rope guide mechanism consists of a gantry 35, a gantry 311, a gantry guide roller 36, a gantry guide roller 312, an upper guide roller 310, and a lower guide roller 313. It is used to initially limit the rope's travel position and ensure that the rope passes smoothly through the automatic shifter 3.

[0050] The door opening mechanism consists of a door leaf 35, a mounting base 37 on the door leaf, a torsion spring 38, a mounting base 39 on the door frame, and a door frame 311. When a single section of rope passes normally through the automatic shifter 3, the door leaf 35 remains closed under the restoring force of the torsion spring 38. When the knot 11 connecting the thin rope 10 and the thick rope 12 passes through the automatic shifter 3, the thickness of the knot exceeds the door width when the door leaf is closed. Under the action of the rope traction force, it overcomes the restoring force of the torsion spring and pushes the door leaf open. After the knot has completely passed through the automatic shifter, the door leaf returns to its closed state under the restoring force of the torsion spring.

[0051] The sliding mechanism is composed of guide rail 31, gantry 311, gantry lower mounting base 314, and preload spring 315. For example... Figure 6 As shown, when the limit is released, the restoring force of the pre-tension spring 315 pulls the entire gantry rope guide mechanism to slide along the guide rail 31 toward the direction of the housing 2. During this sliding process, the rope passing through the automatic shifter 3 is shifted and shifted.

[0052] The stepping limit mechanism consists of a guide rail 31, a second-position limit bolt 32, a first-position limit bolt 33, and a lower mounting base 34 for the door leaf. When the door leaf 35 is closed, the limit pin on the lower mounting base 34 abuts against the second-position limit bolt 32 or the first-position limit bolt 33, thereby preventing the entire door-type rope guide mechanism from sliding along the guide rail 31 towards the housing 2.

[0053] The following describes the working method of the rope tensioner in this embodiment, using the rope traction process as an example.

[0054] like Figure 7 As shown, during the first-gear tightening operation, the thin rope 10 sequentially passes through the gantry-type rope guide mechanism of the automatic shifter 3, the narrow U-shaped groove 41 of the inlet double-linked rope guide wheel 4, the narrow V-shaped groove 71 of the double-linked drive wheel 7, and the narrow U-shaped groove 41 of the outlet double-linked rope guide wheel 6. At this time, the door 35 in the automatic shifter 3 remains closed, and the limiting post head of the mounting base 34 under the door abuts against the first-gear limiting bolt 33, locking the sliding mechanism in the first gear. Under the control of the drive controller 9, the motor 8 drives the double-linked drive wheel 7 to rotate, pulling the thin rope 10 through the tightener with high linear speed and low tension, completing the tightening operation of the thin rope segment.

[0055] like Figure 8As shown, when the knot 11 at the end of the thin rope 10 enters the automatic shifter 3 under the action of traction, because the thickness of the knot exceeds the door width when the door 35 is closed, the knot pushes the door open. The opening action of the door causes the limiting post on the lower mounting base 34 of the door to disengage from the first-position limiting bolt 33, and the locking action of the stepping limiting mechanism is released. The sliding mechanism then takes effect, and the restoring force of the pre-tension spring 315 pulls the entire gantry rope guide mechanism to slide along the guide rail 31 towards the housing 2. During this sliding process, the gantry rope guide mechanism moves the knot 11 and the thick rope 12 that comes with the knot towards the housing 2, so that the thick rope enters the working position corresponding to the second position. During this period, the knot and the thick rope pass through the automatic shifter one after another, and the door 35 gradually closes under the action of the torsion spring 38. Once the door is fully closed, the limiting post of the lower mounting base 34 abuts against the second-position limiting bolt 32, locking the stepping limiting mechanism again. At this point, the entire gantry rope guide mechanism and the thick rope 12 are switched to the second-position working position. The knot 11 then passes through the gaps between the inlet double rope guide wheel 4, the double drive wheel 7, and the outlet double rope guide wheel 6, and leaves the tensioner.

[0056] like Figure 9 As shown, during the second-gear rope tightening operation, the thick rope 12 passes sequentially through the gantry rope guide mechanism of the automatic shifter 3, the wide U-shaped groove 42 of the inlet double-linked rope guide wheel 4, the wide V-shaped groove 72 of the double-linked drive wheel 7, and the wide U-shaped groove 42 of the outlet double-linked rope guide wheel 6. Under the control of the drive controller 9, the motor 8 drives the double-linked drive wheel 7 to pull the thick rope 12 through the rope tightener at a low linear speed and high tension, thus completing the rope tightening operation of the thick rope section.

[0057] This embodiment sets two working modes. The number of gears can be increased based on the same automatic shifting principle according to actual operation needs.

[0058] The rope tensioner in this embodiment uses a multi-position structure composed of a double drive wheel 7 and a double guide wheel. In conjunction with the coordinated operation of the portal rope guide mechanism, door opening mechanism, sliding mechanism and stepping limit mechanism of the automatic shifter 3, it utilizes the natural feature that ropes of various levels are connected by knots 11 in the overhead line construction to achieve a continuous rope tensioning function without stopping the machine. It automatically shifts the rope to switch positions when the knot 11 passes and automatically resets and locks after the knot 11 passes. Under constant motor power, it takes into account both the high linear speed requirement when tightening thin ropes and the high tensile force requirement when tightening thick ropes. This allows a single device to cover the entire stage of rope tensioning operations in overhead line construction, from diameters of 3.5 mm to 26 mm and tensile forces from tens of kilograms to hundreds of kilograms.

[0059] The present invention also discloses a method for stringing cables using the above-mentioned cable tensioner, specifically including the following steps:

[0060] S1. The thin rope 10 to be pulled is sequentially passed through the portal rope guide mechanism of the automatic shifter 3, the narrow U-shaped groove 41 of the inlet double rope guide wheel 4, the narrow V-shaped groove 71 of the double drive wheel 7, and the narrow U-shaped groove 41 of the outlet double rope guide wheel 6, so that the thin rope 10 corresponds to the working channel of the first gear. At this time, the door 35 of the automatic shifter 3 remains closed under the restoring force of the torsion spring 38, and the limiting post of the lower mounting base 34 of the door abuts against the first gear limiting bolt 33, and the sliding mechanism is locked in the first gear.

[0061] S2, Reference Figure 7 The motor 8 is started by the drive controller 9. The motor 8 drives the double drive wheel 7 to rotate, which pulls the thin rope 10 with high linear speed and low tension, so that the rope passes through the tensioner continuously along its length.

[0062] S3. Reference Figure 8 When the knot 11 at the end of the thin rope 10 is pulled to the automatic shifter 3 under traction, the thickness of the knot 11 exceeds the door width when the door leaf 35 is closed, pushing the door leaf 35 open and causing the limiting post of the mounting base 34 under the door leaf to disengage from the first-position limiting bolt 33, thus releasing the locking effect of the stepping limiting mechanism. Subsequently, the pre-tension spring 315 of the sliding mechanism releases its stored energy, pulling the entire gantry rope guide mechanism to slide along the guide rail 31 towards the housing 2. During this sliding process, the knot 11 and the thick rope 12 that comes with the knot are moved towards the housing 2. That is, the knot 11 triggers the automatic shifter 3 to move the rope to the next position, so that the thick rope 12 enters the working position corresponding to the second position.

[0063] S4, Reference Figure 9 After the knot 11 and the thick rope 12 pass through the automatic shifter 3, the door 35 gradually closes and resets under the restoring force of the torsion spring 38. When the door 35 is fully closed, the limiting post of the mounting base 34 under the door abuts against the second-gear limiting bolt 32, and the stepping limiting mechanism locks again, realizing the reset and locking of the automatic shifter 3, so that the thick rope 12 is stable in the second gear working position. At this time, the thick rope 12 falls into the wide V-shaped groove 72 of the double drive wheel 7 and the wide U-shaped groove 42 of the inlet double guide rope wheel 4 and the outlet double guide rope wheel 6. The motor 8 continues to drive the double drive wheel 7 to rotate, pulling the thick rope 12 with low linear speed and high tension, so that the rope continues to be pulled in the new gear.

[0064] During continuous operation, repeating S2 to S4 allows for the sequential completion of traction operations on multiple sections of ropes with varying diameters connected by knot 11 without stopping the machine. This covers the full range of traction needs, from 3.5 mm to 26 mm in diameter and from tens of kilograms to hundreds of kilograms in tens of kilograms.

[0065] When used for rope tensioning, the tensioner is fixed to an anchor point, such as a ground anchor, tower, or fixed support, and the free end of the rope to be tensioned is connected to the object to be tensioned. After starting the motor 8, the double drive wheel 7 rotates to pull the rope, applying tension to the rope and gradually tightening it, thus completing the rope tightening and tensioning operation. In this operation mode, the tensioner remains stationary, and the rope moves relative to the housing 2 under the traction of the double drive wheel 7.

[0066] When needed, this rope tensioner can also be used as a rope climber.

[0067] When used as a rope climber, after starting the motor 8, hang the rope tensioner on the guide ropes fixed at both ends, then connect the object to be climbed to the device. The rope tensioner will move along the guide rope by relying on the traction force of the double drive wheel 7, thus completing the rope climbing operation.

[0068] Therefore, in addition to being used as a rope tensioner to complete rope tightening and tensioning operations, the device described in this invention can also be used as a rope climber to move along the rope, achieving two uses in one machine.

[0069] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although detailed descriptions have been provided with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rope tensioner for overhead power line construction, characterized in that: Includes housing, drive wheel, guide wheel, motor, and automatic shifter; The drive wheel is rotatably mounted on the housing, and the motor is connected to the drive wheel for transmission; the drive wheel has at least two drive grooves of different specifications arranged side by side along its axial direction; the guide rope wheel is mounted on the housing to guide the rope in and out of the drive wheel; the guide rope wheel has guide rope grooves corresponding to each drive groove. The automatic shifter is located on the rope entry side of the drive wheel. It limits the rope and shifts the rope to the drive groove and guide groove corresponding to the current rope diameter when the rope diameter changes.

2. The tensioner for overhead line construction as described in claim 1, characterized in that: The automatic shifter includes a guide rail, a gantry, a door leaf, a torsion spring, a pre-tension spring, a first-gear limit bolt, and a second-gear limit bolt; The guide rail is fixed to the housing; the gantry is slidably mounted on the guide rail; the door leaf is hinged to the gantry; torsion springs connect the door leaf and the gantry respectively; one end of the pre-tension spring is connected to the gantry and the other end is connected to the housing; the first-position limit bolt and the second-position limit bolt are fixed to the guide rail at intervals.

3. The tensioner for overhead line construction as described in claim 2, characterized in that: The gantry is C-shaped, with its bottom end slidably mounted on a guide rail. The top of the gantry is provided with a gantry mounting seat, and the top of the door leaf is provided with a door leaf mounting seat. The two ends of the torsion spring are respectively connected to the door leaf mounting seat and the gantry mounting seat. Door leaf guide rollers are installed on the door leaf, gantry guide rollers are installed on the gantry, and upper guide rollers and lower guide rollers are respectively installed on the upper and lower parts of the gantry.

4. The tensioner for overhead line construction as described in claim 2, characterized in that: The lower part of the gantry is provided with a gantry lower mounting seat. One end of the pre-tension spring is connected to the gantry lower mounting seat and the other end is connected to the inside of the housing. The pre-tension spring is in a pre-stretched state. The lower part of the door leaf is provided with a door leaf lower mounting seat. The door leaf lower mounting seat is provided with a protruding limiting post. When the door leaf is closed, the limiting post abuts against the first or second limiting bolt.

5. The tensioner for overhead line construction as described in claim 1, characterized in that: The drive wheel is a double drive wheel with two V-shaped grooves, one narrow and one wide. The narrow V-shaped groove pulls a thin rope with a smaller diameter, while the wide V-shaped groove pulls a thick rope with a larger diameter. Each V-shaped groove has wedge-shaped teeth of varying heights. The drive wheel is made of a porous material.

6. The tensioner for overhead line construction as described in claim 1, characterized in that: The guide sheaves include an inlet double guide sheave and an outlet double guide sheave, which are respectively arranged on the rope inlet side and the rope outlet side of the drive wheel; each guide sheave is provided with two U-shaped grooves, one narrow and one wide, the narrow U-shaped groove supports thin ropes with smaller diameter, and the wide U-shaped groove supports thick ropes with larger diameter; the guide sheaves are made of porous material.

7. The tensioner for overhead line construction as described in claim 1, characterized in that: It also includes a dustproof plate covering one side of the casing.

8. The tensioner for overhead line construction as described in claim 1, characterized in that: It also includes a handle that is fixedly attached to the outside of the housing.

9. The tensioner for overhead line construction as described in claim 1, characterized in that: It also includes a drive controller that is electrically connected to the motor; the output shaft of the motor is connected to the drive wheel via a key.

10. A method for stringing a cable using the tensioner according to any one of claims 1-9, characterized in that, Includes the following steps: S1. Pass the thin rope to be pulled through the automatic shifter, the guide wheel and the groove on the drive wheel corresponding to the first gear in sequence; S2. Start the motor. The motor drives the drive wheel to rotate, and pulls the thin rope continuously through the tensioner along its length in the first gear. S3. When the knot at the end of the thin rope, which is used to connect to the thick rope, is pulled to the automatic shifter, the knot triggers the automatic shifter to release the limit and moves the knot and the thick rope to the next gear, so that the thick rope enters the drive groove and guide groove corresponding to the next gear. S4. After the knot and the thick rope pass through the automatic shifter, the automatic shifter resets and locks, and the thick rope is stabilized in the next gear working position. The drive wheel continues to pull the thick rope in that gear. During continuous operation, by repeating steps S2 to S4, multiple sections of ropes with varying diameters connected by knots can be pulled sequentially without stopping the machine.

Images