Buried wire laying device and laying method

Abstract

The invention provides a buried wire laying device and laying method, and relates to the technical field of wire installation, the buried wire laying device comprises a moving trolley, the moving trolley is provided with a long pull rod, and the long pull rod is provided with a plurality of guide rings for guiding the direction of a wire along the length direction; the wire winding drum is arranged on the moving trolley, a gap is reserved between the inner side of the wire winding drum and the electric wire, a spiral guide groove is formed in the wire winding drum in the axial direction, a wire unwinding reel is arranged on the pull rod, a steel wire is wound in the wire unwinding reel, and the steel wire can be driven to enter the spiral guide groove to form a winding spring and is arranged on the electric wire in a sleeving mode; the pressing wheel is rotationally mounted at the tail end of the moving trolley and pressed on the electric wire so as to guide the electric wire; the cutting assembly is arranged on the moving trolley and used for cutting and breaking the winding spring. The device can work in a deep and narrow wire duct environment, residual stress in the paying-off process is effectively controlled, stable laying and straight in-place of wires are achieved, and the construction quality and laying precision are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of electrical wire installation technology, and more specifically, to a buried electrical wire laying device and laying method. Background Technology

[0002] In urban power distribution and communication engineering, buried power cables are often wound on reels for ease of transportation and construction. During the winding and handling process, residual stress and torsional energy are generated in the cables. When the cables are laid out, the release of these stresses can cause twisting, arching, or localized springback. In confined spaces with narrow cross-sections or large depths of the cable trench, twisting, arching, or localized springback can directly cause the cables to bend, the outer sheath to be scratched, or the conductor to deform, thereby reducing their service life and increasing the probability of operational failure.

[0003] Existing cable laying aids are mostly designed for open spaces or large cross-sections, making it difficult to achieve controllable and flat positioning in deep and narrow cable trenches. They also often require manual adjustments afterward, affecting construction efficiency and increasing construction costs. Summary of the Invention

[0004] The purpose of this invention is to provide a buried wire laying device and method that can work in deep and narrow cable trench environments. By effectively controlling the residual stress during the laying process, it can achieve stable laying and straight positioning of the wire, significantly improving construction quality and laying accuracy.

[0005] Firstly, the present invention is achieved through the following technical solution: A buried power cable laying device, comprising: A mobile trolley is provided with a long pull rod, and the long pull rod is provided with a plurality of guide rings along its length to guide the direction of the wires; A wire winding spool is mounted on the mobile trolley for mounting wires, with a gap reserved between its inner side and the wires. A spiral guide groove is provided inside the wire winding spool along the axial direction. A wire feeding spool is mounted on the pull rod, and a steel wire is wound inside the wire feeding spool. The steel wire can be driven into the spiral guide groove to form a winding spring and be mounted on the wires. A pressure roller is rotatably mounted at the rear end of the mobile trolley and presses against the wire to guide it. A cutting assembly, mounted on the mobile trolley, is used to cut the coiled spring.

[0006] Furthermore, the winding spool includes a flared section and a straight section. The flared section is close to the inlet end of the steel wire. The inner wall of the straight section is smoothly connected to the inner wall of the flared section. Winding rings are spaced apart and coaxially arranged on the inner side of the flared section. The spiral guide groove includes a first spiral groove and a second spiral groove. The first spiral groove is arranged along the outer periphery of the winding ring, and the second spiral groove is arranged along the inner wall of the straight section. The first spiral groove and the second spiral groove are smoothly connected to each other.

[0007] Furthermore, the pitch of the second helical groove is smaller than the pitch of the first helical groove; And / or, a bracket is fixedly provided on the flared section, a pair of drive wheels are rotatably provided on the bracket, and a drive motor is provided on the bracket to drive the drive wheels to rotate. The steel wire passes through the first spiral groove of the wire coiling ring in the flared section from between the pair of drive wheels. And / or, the pressure roller is rotatably mounted on the swing arm, the tail end of the moving trolley is fixedly mounted with a hinge seat, the swing arm is hinged to the hinge seat, and the pressure roller has a predetermined mass to apply a pressing force to the wire by its own weight.

[0008] Furthermore, the cutting assembly includes cutting blades arranged symmetrically on both sides of the straight section outlet and a drive cylinder. The cutting blades are mounted on the piston rod of the drive cylinder, which is fixedly installed inside the moving trolley and is used to drive the cutting blades to cut the coiled spring.

[0009] Furthermore, the cutting assembly also includes a support cylinder, which is a thin-walled cylinder structure and is coaxially arranged with the winding spool. One end of the support cylinder extends out of the straight section, which is used to provide cutting limit for the winding spring when the cutting blade cuts the winding spring.

[0010] Furthermore, a first pressure strip is fixedly provided on each of the two cutting blades. The first pressure strip is arranged along the side away from the straight section and can move synchronously with the reciprocating motion of the cutting blade to squeeze the opposite sides of the coiled spring.

[0011] Furthermore, the mobile trolley is also provided with a pair of second pressure strips for pressing the other two sides of the coiled spring. The pair of second pressure strips are arranged perpendicular to the first pressure strip and are located near the straight section. Each of the second pressure bars has a guide bevel on the side near the straight section to guide the entry direction of the coiled spring; The pressing part of the first pressure strip is located on the side of the second pressure strip away from the straight section.

[0012] Furthermore, a guide cover is provided at the rear end of the mobile trolley, and the width of the guide cover gradually decreases in the direction away from the mobile trolley. And / or, a pair of guide rollers are rotatably arranged inside the moving trolley and in front of the winding drum, with a power supply line passing between the pair of guide rollers.

[0013] Furthermore, the long pull rod is a telescopic structure, and a locking element is provided on the long pull rod to lock its length after the long pull rod is extended or retracted; And / or, the long tie rod is hinged to the front end of the mobile trolley; And / or, a positioning wheel is installed on the long pull rod at the front end of the mobile trolley, the positioning wheel is hinged to the long pull rod via a front swing frame, and a limit member is also provided on the long pull rod to limit the rotation angle of the front swing frame on the long pull rod.

[0014] Secondly, the present invention is achieved through the following technical solution: A method for laying underground power cables, using the underground power cable laying device described in the above scheme, includes the following construction steps: S1. Place the mobile trolley into the underground cable trench to be constructed, and then pass one end of the wire through the multiple guide rings on the long tie rod and out through the wire winding spool. S2. Adjust the position of the pressure roller so that it presses against the outer surface of the wire to guide and limit the wire; at the same time, fix the movable end of the wire and pull the moving trolley to move along the wire groove to perform the wire feeding operation. S3. During the wire feeding process, the drive structure of the wire feeding reel is activated as needed to allow the steel wire to enter the spiral guide groove inside the wire drum and form a winding spring. The winding spring is sleeved on the wire and is used to constrain the wire's posture and control stress. S4. When the winding spring is wound to a predetermined length, the cutting assembly is activated to cut the winding spring, so that multiple segmented winding springs are formed on the outer surface of the wire. S5. Continue to pull the moving trolley forward and repeat steps S3 and S4 until the wire is laid along the entire length of the cable tray, thus completing the underground laying of the wire.

[0015] The technical solution of the present invention has at least the following advantages and beneficial effects: 1. This invention, by incorporating a mobile trolley and a long pull rod, allows the entire device to directly extend into narrow wire troughs or trenches. During its movement, a guide ring guides the wire in an orderly manner, achieving automatic wire laying and directional installation. This avoids the bending or tangling problems caused by manually pulling the wire in the trench. Simultaneously, the spiral guide grooves arranged axially inside the winding drum cooperate with the wire unwinding reel. After the steel wire enters the spiral guide grooves, it automatically forms uniformly wound springs on the wire. During installation, the wire is periodically supported and wrapped by these springs, significantly resisting bending stress and straightening the wire under their constraint.

[0016] 2. Due to the excellent elasticity of the coiled springs, after being fitted onto the outside of the wire, they provide uniform external support and constraint, preventing localized twisting, arching, or excessive bending during installation. The coiled springs, to a certain extent, hinder wire deformation without compressing or abrading the wire itself, thus balancing constraint and protection. Furthermore, the segmented installation structure of the coiled springs allows for selection based on the actual laying route. Springs can be installed only at intervals on long straight sections, while omitting springs in sections requiring bends or curves. This ensures the wire remains straight during long straight laying and maintains flexibility at corners, improving the overall flatness and reliability of the wire installation.

[0017] 3. In conjunction with the pressure roller structure at the tail end, the weight of the pressure roller provides continuous guiding pressure to the wire, making the wire fit more closely to the bottom of the cable tray when it is released, thus improving the stability and fit of the laying. The overall structure can automatically complete the actions of wire release, winding, pressing and cutting during continuous movement, reducing manual intervention and improving laying efficiency and construction quality. Attached Figure Description

[0018] Figure 1 A schematic diagram of the overall structure of a buried power cable laying device provided by the present invention; Figure 2 for Figure 1 Enlarged view of section A; Figure 3 for Figure 1 Enlarged view of section B; Figure 4 This invention aims to show an exploded view of the interior of the mobile vehicle and the cutting components; Figure 5 This is a schematic diagram illustrating the structure of the wire winding spool and the cutting assembly. Figure 6 This invention aims to show a front view of the wire winding spool, the cutting assembly, the first pressure bar, and the second pressure bar; Figure 7 This invention aims to illustrate the internal structure of a wire winding spool; Reference numerals: 100-moving trolley, 101-wheel, 110-installation space, 120-insertion cavity, 130-guide roller, 200-long pull rod, 201-scale, 202-handle, 203-pin hole, 210-guide ring, 220-winding reel, 221-steel wire, 2210-clamping ring, 2211-winding spring, 223-mounting base, 300-winding drum, 310-spiral guide groove, 311-first spiral groove, 312-second spiral groove, 320-flared section, 321-bracket, 3211-drive wheel, 321 2-Drive motor, 330-Straight section, 340-Wire coiling ring, 341-Support plate, 400-Pressure roller, 410-Swing rod, 420-Hinge seat, 500-Cutting assembly, 510-Cutting blade, 520-Drive cylinder, 530-Support cylinder, 540-First pressure bar, 541-Extrusion part, 550-Second pressure bar, 551-Guide angle, 600-Guide cover, 610-Allowing opening, 700-Locking component, 710-Limit pin, 800-Positioning wheel, 810-Front swing frame, 811-Limit component, 8111-Locking bolt. Detailed Implementation

[0019] 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, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] Example 1 The following is for reference Figures 1-7 As shown in the illustration, and further explained with reference to a specific embodiment, this embodiment provides a buried cable laying device, including a mobile trolley 100. The mobile trolley 100 is equipped with multiple wheels 101, which can be selected from wear-resistant rubber wheels, engineering plastic wheels, or metal wheels according to the usage environment to adapt to different underground cable trays. A long pull rod 200 is hingedly mounted on the mobile trolley 100, and the long pull rod 200 is connected to the front end of the mobile trolley 100 via a pin. This hinged structure allows the long pull rod 200 to swing within a certain range according to the pulling direction of the operator, facilitating pulling and adapting to different cable tray or trench paths.

[0022] The top of the long pull rod 200 has a handle 202, which may be rubber-coated to improve grip comfort and anti-slip properties. The long pull rod 200 has multiple guide rings 210 along its length to guide the wire's path. The guide rings 210 may be fixed to the long pull rod 200 by integral welding or snap-fit ​​assembly to ensure that the wire enters the winding drum 300 area along a fixed trajectory and remains stable without jumping.

[0023] The long pull rod 200 is a telescopic structure, consisting of two or more inner and outer sleeves. The outer sleeve has markings 201, allowing operators to easily set the specific length according to the groove depth. This prevents the pull rod from being too long and affecting the movement of the trolley 100, and also prevents it from being too short and causing an unreasonable guiding angle. The long pull rod 200 is equipped with a locking element 700 to lock its length after extension or retraction. The locking element 700 is a limiting pin 710, which automatically engages with multiple pin holes 203 along the length of the long pull rod 200 via a spring-loaded latch, enabling rapid positioning at different length positions. In other embodiments, the locking element 700 can be a helical fastener or an eccentric locking element to achieve more precise length adjustment and stronger locking force.

[0024] The mobile trolley 100 is a housing with an installation space 110. The installation space 110 is supported by reinforcing ribs to facilitate the installation of components such as the wire winding drum 300. The wire winding drum 300 is installed in the installation space 110 of the mobile trolley 100. A pair of mounting seats 223 are fixedly installed in the installation space 110. The mounting seats 223 are connected to the trolley body by screws or welding. The wire winding drum 300 is coaxially sleeved on the wire, and the wire passes through the inside of the wire winding drum 300. A gap is reserved between the inside of the wire winding drum 300 and the wire to ensure that the wire sheath is not squeezed when the wire 221 is wound into a coiled spring 2211.

[0025] The spool 300 is fixedly mounted on the mounting base 223, maintaining a stable posture under the fixing effect of the mounting base 223. A spiral guide groove 310 is provided axially inside the spool 300. The cross-section of the guide groove can be designed as a semi-circular groove or a V-shaped groove to guide the steel wire 221 to form smoothly. A wire unwinding reel 220 is fixedly or detachably rotatably mounted near the top of the long pull rod 200. The wire 221 is wound inside the wire unwinding reel 220 and can be driven into the spiral guide groove 310 to form a winding spring 2211 and be sleeved on the wire. Simultaneously, a retaining ring 2210 is provided on the guide ring 210 of the long pull rod 200 or on the body of the long pull rod 200. The retaining ring 2210 is used to limit the steel wire 221, preventing the steel wire 221 from swinging or deviating before entering the spool 300.

[0026] In different embodiments, a heating element can be provided at the front end of the winding drum 300 to locally heat the coiled spring 2211 formed by the steel wire 221 after it enters the winding drum 300. The heating element can be a resistance wire heating coil or a miniature hot air heater structure, arranged on the outer wall of the winding drum 300 or close to the forming area of ​​the steel wire 221. By heating, the steel wire 221 achieves a certain stress relief and shaping effect after deformation, reducing the instantaneous rebound of the coiled spring 2211, ensuring that the coiled spring 2211 is straighter after being sleeved on the outside of the wire, and improving the attachment stability of the coiled spring 2211. The heating element can be precisely temperature-controlled by a temperature controller to prevent the steel wire 221 from overheating and affecting the material properties. In some embodiments, the heating element can also operate intermittently to save energy and adjust the heating according to different steel wire 221 materials.

[0027] It should be noted that the wires mentioned in this invention include cables, normal wires or communication lines, etc., all of which can be laid underground using this laying device.

[0028] The pressure roller 400 is rotatably mounted on the rear end of the mobile trolley 100 and presses against the wire to guide it. The shaft of the pressure roller 400 is connected to the swing rod 410 via a bearing to ensure smooth rotation. The outer ring of the pressure roller 400 can be made of wear-resistant rubber or metal-coated rubber to prevent damage to the wire sheath while providing suitable friction. The pressure roller 400, through its own weight, can stably press the wire, ensuring a stable path for the wire during installation.

[0029] Reference Figure 5 and Figure 6 As shown, the cutting assembly 500 is mounted on the mobile trolley 100 and is used to cut the coiled spring 2211. The cutting assembly 500 includes cutting blades 510 arranged symmetrically and laterally on both sides of the exit of the straight section 330, and a drive cylinder 520. A pair of drive cylinders 520 are fixedly installed within the mounting space 110 of the mobile trolley 100. The cutting blades 510 are mounted on the piston rods of the drive cylinders 520, which can rapidly extend and retract, causing the cutting blades 510 to cut the coiled spring 2211. The cutting blades 510 can be made of high-speed steel or hard alloy to ensure sharp cutting and wear resistance.

[0030] Reference Figure 6 and Figure 7As shown, the wire winding spool 300 includes a flared section 320 and a straight section 330. The flared section 320 is located near the inlet end of the steel wire 221, and its inner diameter is tapered with a gradually increasing diameter, designed to allow the steel wire 221 to initially wind along the winding ring 340. The inner wall of the straight section 330 smoothly transitions to the inner wall of the flared section 320, preventing the steel wire 221 from getting stuck at the transition position. The winding rings 340 are spaced apart and coaxially arranged on the inner side of the flared section 320. The winding rings 340 are used to limit and support the winding of the steel wire 221, allowing the steel wire 221 to gradually come into contact with the inner wall along a fixed guide path, forming an initial winding spring 2211.

[0031] The spiral guide groove 310 includes a first spiral groove 311 and a second spiral groove 312. The first spiral groove 311 is arranged along the outer periphery of the coiled wire ring 340, and the second spiral groove 312 is arranged along the inner wall of the straight section 330. The first spiral groove 311 and the second spiral groove 312 are smoothly connected to each other. The pitch of the second spiral groove 312 is smaller than that of the first spiral groove 311, which allows the steel wire 221 to be further compressed after entering the straight section 330 to form a tighter spiral structure, improving the forming quality of the coiled spring 2211 and thus enhancing its support capacity after installation.

[0032] Reference Figure 5 and Figure 6 As shown, a bracket 321 is fixed on the flared section 320, and a pair of drive wheels 3211 are rotatably mounted on the bracket 321. The surface of the drive wheels 3211 can be provided with grooves or a rubber coating to increase friction. A drive motor 3212 is mounted on the bracket 321 to drive the drive wheels 3211 to rotate, and the drive motor 3212 is connected to the drive wheels 3211 through a synchronous belt or a reduction mechanism. The steel wire 221 passes through the pair of drive wheels 3211 into the first spiral groove 311 of the winding ring 340 in the flared section 320 from between the pair of drive wheels 3211. The rotation of the drive motor 3212 drives the pair of drive wheels 3211 to rotate, thereby driving the steel wire 221 to stably enter the first spiral groove 311. In some embodiments, in order to ensure that the steel wire 221 does not deviate when running at high speed, multiple pairs of drive wheels 3211 arranged side by side can be used, so that the steel wire 221 enters the spiral groove more smoothly under the clamping of multiple wheel sets.

[0033] Reference Figure 4 As shown, the pressure roller 400 is rotatably mounted on the swing arm 410, and a hinge seat 420 is fixedly mounted on the tail end of the moving trolley 100. The swing arm 410 is hinged to the hinge seat 420. The pressure roller 400 has a predetermined mass to apply a clamping force to the wire by its own weight, thus providing a continuous and stable clamping effect without additional power. The pressure roller 400 can be made of a heavy metal material, such as cast steel or high-density aluminum alloy, to ensure that it provides sufficient clamping force. The pressure roller 400 has an annular groove in its circumference to clamp the wire, and this annular groove matches the outer diameter of the wire, making the clamping more stable.

[0034] In different embodiments, a small vibration motor can be installed on the swing arm 410. The vibration motor can cause the swing arm 410 and the pressure roller 400 to produce slight vibrations, which can relieve the relative stress between the coiled spring 2211 and the wire, make the coiled spring 2211 more evenly distributed on the surface of the wire after being sleeved, and further improve the straightness of the wire.

[0035] Reference Figure 7 As shown, the cutting assembly 500 also includes a support cylinder 530. The support cylinder 530 is a thin-walled cylindrical structure made of a hard metal material, such as stainless steel or aluminum alloy, to ensure its rigidity and provide reliable support during the cutting process. The support cylinder 530 is coaxially arranged with the wire winding drum 300 and is extended and fixed to the front end of the wire winding drum 300 by a support plate 341, so that the support cylinder 530 is not easily deflected when the cutting blade 510 applies lateral force. One end of the support cylinder 530 extends into a straight section 330, which is used to limit the winding spring 2211 when the cutting blade 510 winds around the spring 2211, preventing the winding spring 2211 from jumping due to force and affecting the cutting accuracy. At the same time, the support cylinder 530 can also act as a conductor for the wire, maintaining an appropriate gap between the winding spring 2211 and the wire, avoiding excessive restraint, and preventing wear between the winding spring 2211 and the wire sheath.

[0036] Reference Figures 4-6 As shown, first pressure strips 540 are fixedly installed on the two cutting blades 510 respectively. The first pressure strips 540 are arranged along the side away from the straight section 330 and can move synchronously with the reciprocating motion of the cutting blades 510, so as to simultaneously laterally compress the left and right sides of the coiled spring 2211 after cutting. A pair of second pressure strips 550 for compressing the vertical sides of the coiled spring 2211 are fixedly installed on the mounting base 223. The pair of second pressure strips 550 are located behind the pair of first pressure strips 540 and are arranged perpendicular to each other to deform and compress the coiled spring 2211 to a certain extent.

[0037] In this embodiment, the movement and shaping of the coiled spring 2211 are performed in a predetermined sequence: the steel wire 221 is formed into a coiled spring 2211 within the winding drum 300 and moves forward with the wire, first contacting the first pressure strip 540 which moves synchronously with the cutting blade 510. The first pressure strip 540 performs preliminary lateral compression and positioning on the coiled spring 2211, suppressing the lateral amplitude and eccentricity of the coiled spring 2211, thereby pre-correcting the pitch and radial position of the coiled spring 2211 to a state conducive to subsequent shaping. Subsequently, the preliminarily positioned coiled spring 2211 enters the vertical restriction zone formed by a pair of fixed second pressure bars 550. To prevent the coiled spring 2211 from getting stuck when entering this zone, the second pressure bar 550 is provided with a guide angle 551 on the side near the straight section 330. The guide angle 551 plays a guiding and buffering role when the coiled spring 2211 enters, so that the coiled spring 2211 passes smoothly through the opening of the second pressure bar 550 without head-on collision or lifting.

[0038] The staggered clamping process, which involves first performing lateral pre-extrusion with a moving first pressure bar 540 and then vertical shaping with a fixed second pressure bar 550, offers three clear benefits: First, by applying force in stages, it avoids applying a combined vector force to the coil spring 2211 at the same instant, reducing the instantaneous rebound and irregular deformation of the coil spring 2211. Second, the lateral pre-positioning improves the geometric consistency of the coil spring 2211 when it enters the area of ​​the second pressure bar 550, allowing the second pressure bar 550 to complete the final shaping with less impact force, thereby reducing the risk of local indentations or scratches on the wire sheath. Third, the staggered stepped clamping creates a more uniform contact surface between the coil spring 2211 and the wire, increasing the contact area and reducing the unit contact stress, thus better protecting the wire body during laying and cutting.

[0039] This phased force application prevents the application of excessively large and complex vector forces (such as simultaneous large lateral and vertical forces) to the coil spring 2211 at a single moment, thus avoiding local yielding or instantaneous rebound of the coil spring 2211 that could lead to coiling / lifting. Phased compression also allows the coil spring 2211 to gradually converge to a stable shape while forming a larger effective contact area with the wire surface, reducing unit contact pressure, minimizing micro-cutting or long-term indentation of the sheath, and extending the lifespan of the wire.

[0040] Reference Figure 4As shown, a guide cover 600 is provided at the rear end of the mobile trolley 100. A clearance opening 610 for the rotation of the swing arm 410 is provided on the top of the guide cover 600 near the side of the mobile trolley 100, ensuring that the swing arm 410 swings up and down without obstruction. The width of the guide cover 600 gradually decreases in the direction away from the mobile trolley 100, forming a funnel-like structure. When the mobile trolley 100 pushes the soil, it can guide the soil to be evenly distributed on both sides of the power line, thereby enhancing the stability of the power line in the trench and reducing external impact.

[0041] As an optional embodiment, a pair of guide rollers 130 are rotatably arranged within the installation space 110 of the mobile trolley 100 and in front of the winding drum 300. The pair of guide rollers 130 are both vertically and parallelly arranged, forming a structure similar to a clamping channel. The power supply line passes through between the pair of guide rollers 130, further stabilizing the wire's posture before entering the winding drum 300. At the same time, an insertion cavity 120 is provided in front of the guide rollers 130 on the mobile trolley 100. The insertion cavity 120 is a long cavity to facilitate the entry of the wire and has a small range of movement. This prevents the wire from bending more during the process of entering the installation space 110 of the mobile trolley 100 from the long pull rod 200, thus avoiding increased bending stress on the wire at that position, which could affect its entry into the winding drum 300 or cause bending, arching, or other deformations after laying.

[0042] As an optional embodiment, a positioning wheel 800 is installed on the long pull rod 200 at the front end of the mobile trolley 100. The positioning wheel 800 allows the mobile trolley 100 to move more smoothly in a predetermined direction within the groove, preventing the trolley from deviating from the center of the groove. The positioning wheel 800 is hinged to the long pull rod 200 via a front swing bracket 810, with the hinge direction perpendicular to the travel direction of the mobile trolley 100. When the positioning wheel 800 is not needed, it can be rotated upwards and stored away. A limiting member 811 is also provided on the long pull rod 200. In this embodiment, the limiting member 811 is a locking bolt 8111, which can be tightened after the angle of the positioning wheel 800 is adjusted to fix the front swing bracket 810, guiding the positioning wheel 800 at the set angle. In narrow or tortuous grooves, this structure can effectively improve the walking accuracy.

[0043] In other embodiments, during the movement of the mobile trolley 100, a cylinder can be used to push out U-shaped nails at intervals to engage with the wire. A nail box is fixed on the long pull rod 200, and multiple U-shaped nails are stacked inside the nail box via guide rails. When the cylinder pushes, one U-shaped nail can be pushed out at a time, locking it onto the wire or the winding spring 2211 outside the wire, achieving an additional limiting effect. This is suitable for construction environments with large slopes or where the wire may slip. The nail box can adopt a slot-type structure for easy and quick replenishment of U-shaped nails, improving construction efficiency.

[0044] Example 2 This embodiment also provides a method for laying buried power cables, which uses the buried power cable laying device described in the above scheme, and includes the following construction steps: S1. Place the mobile trolley 100 into the underground cable trench to be constructed, and then pass one end of the wire through the multiple guide rings 210 on the long pull rod 200 in sequence, and out through the wire winding drum 300. S2. Adjust the position of the pressure roller 400 so that the pressure roller 400 presses against the outer surface of the wire to guide and limit the wire; at the same time, fix the movable end of the wire front end and pull the moving trolley 100 to move along the wire groove direction to perform the wire feeding operation. S3. During the wire feeding process, the drive structure of the wire feeding reel 220 is activated as needed, so that the steel wire 221 enters the spiral guide groove 310 in the wire winding drum 300 and forms a winding spring 2211. The winding spring 2211 is sleeved on the wire and is used to constrain the posture of the wire and control the stress. S4. When the winding spring 2211 is wound to a predetermined length, the cutting assembly 500 is activated to cut the winding spring 2211, so that multiple segmented winding springs 2211 are formed on the outer surface of the wire. S5. Continue to pull the moving trolley 100 forward and repeat steps S3 and S4 until the wire is laid along the entire length of the cable tray, thus completing the underground laying of the wire.

[0045] The above are merely preferred embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A buried power cable laying device, characterized in that, include: A mobile trolley (100) is provided with a long pull rod (200), and the long pull rod (200) is provided with a plurality of guide rings (210) along its length for guiding the direction of the wires; A wire winding spool (300) is mounted on the moving trolley (100) for mounting wires, with a gap reserved between its inner side and the wires. A spiral guide groove (310) is provided in the axial direction inside the wire winding spool (300). A wire unwinding reel (220) is mounted on the pull rod. A steel wire (221) is wound inside the wire unwinding reel (220). The steel wire (221) can be driven into the spiral guide groove (310) to form a winding spring (2211) and mounted on the wires. A pressure roller (400) is rotatably mounted on the tail end of the mobile trolley (100) and presses against the wire to guide the wire. A cutting assembly (500) is disposed on the moving trolley (100) and is used to cut the coiled spring (2211).

2. The buried power cable laying device according to claim 1, characterized in that, The winding spool (300) includes a flared section (320) and a straight section (330). The flared section (320) is close to the inlet end of the steel wire (221). The inner wall of the straight section (330) is smoothly connected to the inner wall of the flared section (320). Winding rings (340) are spaced apart and coaxially arranged on the inner side of the flared section (320). The spiral guide groove (310) includes a first spiral groove (311) and a second spiral groove (312). The first spiral groove (311) is arranged along the outer periphery of the winding ring (340), and the second spiral groove (312) is arranged along the inner wall of the straight section (330). The first spiral groove (311) and the second spiral groove (312) are smoothly connected to each other.

3. The buried power cable laying device according to claim 2, characterized in that, The pitch of the second helical groove (312) is smaller than the pitch of the first helical groove (311); And / or, a bracket (321) is fixedly provided on the flared section (320), a pair of drive wheels (3211) are rotatably provided on the bracket (321), and a drive motor (3212) is provided on the bracket (321) to drive the drive wheels (3211) to rotate. The steel wire (221) passes through the pair of drive wheels (3211) into the first spiral groove (311) of the coiled wire ring (340) in the flared section (320); And / or, the pressure roller (400) is rotatably mounted on the swing arm (410), the tail end of the moving trolley (100) is fixedly provided with a hinge seat (420), the swing arm (410) is hinged on the hinge seat (420), and the pressure roller (400) has a predetermined mass to apply a pressing force to the wire by its own weight.

4. The buried power cable laying device according to claim 2, characterized in that, The cutting assembly (500) includes a cutting blade (510) arranged symmetrically on both sides of the outlet of the straight section (330) and a driving cylinder (520). The cutting blade (510) is mounted on the piston rod of the driving cylinder (520). The driving cylinder (520) is fixedly installed in the moving trolley (100) and is used to drive the cutting blade (510) to cut the coiled spring (2211).

5. The buried power cable laying device according to claim 4, characterized in that, The cutting assembly (500) also includes a support cylinder (530), which is a thin-walled cylinder structure and is coaxially arranged with the winding spool (300). One end of the support cylinder (530) extends out of the straight section (330) to provide cutting limit for the winding spring (2211) when the cutting blade (510) cuts the winding spring (2211).

6. The buried power cable laying device according to claim 4, characterized in that, A first pressure strip (540) is fixedly provided on each of the two cutting blades (510). The first pressure strip (540) is arranged along the side away from the straight section (330) and can move synchronously with the reciprocating motion of the cutting blade (510) to squeeze the opposite sides of the coiled spring (2211).

7. The buried power cable laying device according to claim 6, characterized in that, The mobile trolley (100) is also provided with a pair of second pressure strips (550) for pressing the other two sides of the coiled spring (2211). The pair of second pressure strips (550) are arranged perpendicular to each other with the first pressure strip (540) and are located near the straight section (330). Each of the second pressure bars (550) is provided with a guide angle (551) on the side near the straight section (330) to guide the entry direction of the coil spring (2211); The pressing portion (541) of the first pressure strip (540) is located on the side of the second pressure strip (550) away from the straight section (330).

8. The buried power cable laying device according to claim 1, characterized in that, The rear end of the mobile trolley (100) is provided with a guide cover (600), and the width of the guide cover (600) gradually decreases in the direction away from the mobile trolley (100). And / or, a pair of guide rollers (130) are rotatably disposed inside the moving trolley (100) and in front of the winding drum (300), with a power supply line passing between the pair of guide rollers (130).

9. The buried power cable laying device according to claim 1, characterized in that, The long pull rod (200) is a telescopic structure, and a locking element (700) is provided on the long pull rod (200) for locking its length after the long pull rod (200) is extended or retracted; And / or, the long tie rod (200) is hinged to the front end of the mobile trolley (100); And / or, a positioning wheel (800) is installed on the long pull rod (200) at the front end of the mobile trolley (100), the positioning wheel (800) is hinged to the long pull rod (200) via a front swing frame (810), and a limit member (811) is also provided on the long pull rod (200) to limit the rotation angle of the front swing frame (810) on the long pull rod (200).

10. A method for laying buried power lines, using the buried power line laying device according to any one of claims 1-9, characterized in that, The construction steps include the following: S1. Place the mobile trolley (100) into the underground cable trench to be constructed, and then pass one end of the wire through the multiple guide rings (210) on the long pull rod (200) in sequence, and out through the wire winding spool (300); S2. Adjust the position of the pressure roller (400) so that the pressure roller (400) presses against the outer surface of the wire to guide and limit the wire; at the same time, fix the movable end of the wire and pull the moving trolley (100) to move along the wire groove to perform the wire feeding operation. S3. During the wire feeding process, the drive structure of the wire feeding reel (220) is activated as needed, so that the steel wire (221) enters the spiral guide groove (310) in the wire winding drum (300) and forms a winding spring (2211). The winding spring (2211) is sleeved on the wire and is used to constrain the posture of the wire and control the stress. S4. When the winding spring (2211) is wound to a predetermined length, the cutting assembly (500) is activated to cut the winding spring (2211), so that multiple segmented winding springs (2211) are formed on the outer surface of the wire. S5. Continue to pull the moving trolley (100) forward and repeat steps S3 and S4 until the wire is laid along the entire length of the trough, and finally complete the underground laying of the wire.

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