Magnetic type flexible guide threading assist device and use method

Abstract

The invention discloses a magnetic type flexible guide threading assistor which is arranged in a line pipe and comprises a flexible guide head, a magnetic module is arranged at the advancing end of the flexible guide head, and the magnetic module is matched with an external insert of the line pipe to position the advancing direction of the flexible guide head; an adaptive interface at the tail end of the flexible guide head is connected with a threading steel wire; and the magnetic suction module, the flexible guide head and the adaptive interface are connected in sequence to form a strip-shaped body for guiding a threading steel wire.

Description

Technical Field

[0001] This invention relates to the field of electrical engineering construction technology, and in particular to a magnetic flexible guide wire threading aid and its usage method. Background Technology

[0002] In electrical engineering construction, wiring through conduits (such as PVC pipes and metal pipes) is a crucial step in electrical installation. It involves threading wires and cables from one end of a pre-buried or installed conduit to the other to achieve concealed wiring. However, in actual construction, conduits are often designed with long distances, multiple bends (such as 90° bends or continuous bends), or complex paths concealed within walls and floors due to building structural requirements, posing numerous challenges to the wiring operation.

[0003] Existing wire threading tools have significant drawbacks, including: traditional rigid wire threaders (such as rigid metal rods) are unable to adapt to changes in the path of curved conduits due to their inherent rigidity. They are prone to jamming and getting stuck at bends, and may even scratch the inner wall of the conduit or damage the cable insulation layer, especially in conduits with multiple bends. Ordinary flexible wire threading tools (such as flexible steel wires and nylon ropes) can adapt to a certain degree of curvature, but they lack active guiding capabilities. They are prone to deviating from the preset path during the threading process, and it is difficult to accurately position and connect the two ends (inside and outside the conduit). In buried conduits, due to obstructed visibility, repeated attempts are often required, resulting in extremely low threading efficiency. Some wire threading tools with guiding functions are either inconvenient to operate due to complex structural designs (such as requiring an external power device) or have insufficient flexibility in their guiding components, failing to meet the dual requirements of "flexible adaptation to curved paths" and "precise guiding and positioning." Especially when the two ends of the conduit are far apart or there are obstructions, the magnetic connection between the two ends of the tool is unreliable, further affecting the success rate of threading.

[0004] The aforementioned problems result in high labor intensity and low efficiency in existing wiring operations, and are prone to increasing construction costs due to improper operation (such as cable damage, rework, etc.), becoming common pain points that restrict the progress of electrical installation. To address the above problems, invention publication CN202322627434.x discloses a detachable magnetic tube-threading device, comprising: a magnetic traction head, a connector, a traction rope, and a magnetic traction rod. The magnetic traction head includes a magnetic sphere and a buckle fixed to the magnetic sphere. One end of the traction rope passes through the buckle and is detachably connected to the main body of the traction rope via the connector to form a rope loop. The magnetic traction head is positioned inside the tube to be threaded, and the magnetic traction rod is positioned outside the tube. The magnetic poles of the magnetic traction rod and the magnetic traction head are opposite, and the magnetic traction rod and the magnetic traction head magnetically attract each other through the side wall of the tube. The device connects the traction rope to the magnetic traction head via the connector, and moves the magnetic traction head by attracting it outside the tube. Oriented threading is achieved through the magnetic attraction effect, and the magnetic sphere of the magnetic traction head passes more easily at corners to avoid thread jamming, thereby improving work efficiency. However, in actual use, although it adopts magnetic positioning and the guide head is an integrated rigid ball, it can only pass through a single 90° bend and cannot adapt to complex pipeline paths such as continuous bends and multiple branches.

[0005] Therefore, there is an urgent need for a threading aid that can simultaneously achieve flexible guidance and precise magnetic positioning. Summary of the Invention

[0006] To address the aforementioned problems in existing technologies, the purpose of this invention is to provide a magnetically pleasing flexible guide threading aid. By combining a flexible serial structure with a magnetically pleasing functional module, this invention solves the problems of high jamming rate, difficult end-positioning, and high operational threshold of rigid threading tools, thereby improving threading efficiency.

[0007] Another object of the present invention is to provide a method of using a magnetically attached flexible guide threading aid.

[0008] To solve the above problems, the present invention adopts the following technical solution: a magnetic flexible guide wire threading aid, wherein the aid is disposed inside the conduit and includes a flexible guide head, wherein the forward end of the flexible guide head is provided with a magnetic module, the magnetic module cooperates with the external magnetic component of the conduit to position the forward direction of the flexible guide head; the tail end of the flexible guide head is provided with an adapter interface for connecting the threading wire; the magnetic module, the flexible guide head, and the adapter interface are sequentially connected to form a strip for guiding the threading wire.

[0009] Furthermore, the flexible guide head is composed of 3-5 flexible units connected in series, with adjacent flexible units linked by a miniature connecting shaft. This design, by disassembling the flexible guide head into 3-5 independent flexible units, increases the flexibility of each individual flexible unit in following the pipeline's direction. This allows the series-connected flexible units to swing sequentially through the pipeline under the influence of the miniature connecting shaft, solving the problem of high jamming rates in long-distance, multi-bend pipelines using traditional rigid steel wires. The jamming rate is reduced, the metal pipe threading time is shortened, and the overall threading efficiency is significantly improved.

[0010] Furthermore, the miniature connecting shaft has a diameter of 2-3 mm and a length of 12-15 mm. Shaft holes are provided at opposite ends of the outer surface of the miniature connecting shaft, and the flexible unit's two ends are respectively inserted into these shaft holes, connecting the flexible unit to the miniature connecting shaft. This solution makes the connection between the flexible unit and the miniature connecting shaft more stable, improving the success rate of threading.

[0011] Furthermore, the flexible unit is made of nylon 66 wire with a diameter of 8-10 mm, a length of 10-15 mm, and a coefficient of friction ≤0.2. This design, based on the durability of nylon 66, ensures a stable overall structure for the flexible guide head, enabling it to withstand wear from repeated threading operations and extending its service life.

[0012] Furthermore, in the flexible guide head, the foremost flexible unit is a hemispherical end, with a 0.1-0.2mm thick polytetrafluoroethylene coating on its surface, and a friction coefficient ≤0.15. This design further reduces threading resistance.

[0013] Furthermore, the magnetic module is a neodymium iron boron strong magnet with a magnetic strength of 800-1200 gauss, located in the frontmost flexible unit. Using this solution, by embedding an 800-1200 gauss neodymium iron boron strong magnet in the frontmost flexible unit, combined with an external magnet, precise end-effector positioning can be achieved, solving the problem of difficult positioning and repeated trial-and-error required by traditional tools in scenarios such as buried conduits.

[0014] Furthermore, the adapter interface is located at the connection end of the flexible unit at the last end of the flexible guide head, and its length is 10-15mm and its diameter is 6-8mm.

[0015] Furthermore, the outer edge of the adapter interface is provided with an M3-M4 external thread or elastic buckle to accommodate Φ2-3mm threaded steel wire or nylon wire. By adopting this solution and designing the adapter interface with a threaded or buckle structure, it is compatible with existing Φ2-3mm threaded steel wire or nylon wire, eliminating the need to replace the entire tool set and facilitating its widespread application in existing construction scenarios.

[0016] This application also provides a method for using a magnetically attached flexible guide threading aid, the method comprising the following steps:

[0017] Step 1: The magnetic module, flexible guide head, and adapter interface are connected in sequence to form a strip-shaped auxiliary device, which is used to guide the wire being threaded; the adapter interface is connected to the wire / nylon line to be threaded, and the front end of the flexible guide head is fed into the inlet of the conduit;

[0018] Step 2: Use external tools to apply pushing / pulling force to push the auxiliary device forward. The flexible guide head bends naturally with the pipeline, driving the steel wire / pull at its tail end forward.

[0019] Step 3: When the auxiliary device approaches the target outlet, the external magnet senses the position of the magnetic module on the auxiliary device through magnetic force and guides it to be precisely aligned with the outlet.

[0020] Step 4: After the auxiliary device is pulled out from the target outlet, it drives the threading steel wire / nylon line located at its tail end to complete the threading operation.

[0021] Furthermore, the flexible guide head described in step two bends naturally with the pipeline. Specifically, the flexible guide head includes 3 to 5 flexible units arranged in series. Adjacent flexible units are movably connected by a micro-connecting shaft, allowing each flexible unit to make independent turning movements and bend adaptively with the pipeline.

[0022] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0023] 1. Significantly improved threading efficiency: This application uses 3-5 olive-shaped flexible units connected in series to form a flexible guide head. The units can be movably connected, allowing the flexible guide head to adapt to the direction of the conduit and easily pass through 90° bends. This solves the problem of high jamming rate of traditional hard steel wire in long-distance, multi-bend pipelines. The jamming rate is reduced, the pipe threading time is shortened, and the overall threading efficiency is greatly improved.

[0024] 2. Precise and reliable end-point positioning: This application uses a neodymium iron boron strong magnet of 800-1200 gauss built into the flexible unit at the front end, which, together with an external magnet, can achieve precise positioning of the auxiliary device with a positioning accuracy of over 95%. In particular, it solves the problem of difficult positioning and repeated trial and error required by traditional tools in scenarios such as buried conduits.

[0025] 3. Significantly reduced operating threshold: This application does not require professional experience to adjust the threading angle. The flexible guide head can naturally adapt to pipeline bends, making it easy for ordinary people to use. The learning cost is reduced, and non-professionals can also complete the threading operation efficiently.

[0026] 4. Strong compatibility and low modification cost: The adapter interface of this application is designed with a threaded or snap-fit ​​structure, which can be compatible with existing Φ2-3mm threading steel wire or nylon wire. There is no need to replace the entire set of tools. The modification cost is less than 10 yuan / set, which makes it easy to promote and apply in existing construction scenarios.

[0027] 5. Durable structure: This application further reduces threading resistance by spraying a polytetrafluoroethylene coating (friction coefficient ≤0.15) on the hemispherical end, combined with the flexible unit itself having a friction coefficient ≤0.2; the use of nylon 66 makes the structure stable, able to withstand the wear of repeated threading operations, and extend service life.

[0028] 6. Flexible guidance and magnetic positioning working together: This application provides a pair of auxiliary devices that are designed as a working structure of "flexible guidance + magnetic positioning". This structure not only takes advantage of the anti-jamming advantage of the flexible structure, but also achieves accurate threading with the help of magnetic attraction. Compared with single-function tools in the prior art (such as fixed structure guide heads or rigid magnetic heads), it performs better in complex pipeline threading scenarios. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the flexible guide head structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the auxiliary device structure of the present invention;

[0031] Figure 3 This is a schematic diagram of the micro-connecting shaft structure of the present invention;

[0032] Among them, 1. Flexible unit, 2. Magnetic module, 3. Adaptor interface, 4. Threading wire, 5. Miniature connecting shaft, 11. Hemispherical end, 12. Polytetrafluoroethylene coating. Detailed Implementation

[0033] 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. 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.

[0034] Example 1

[0035] like Figure 1-3As shown, this invention provides a magnetically aspirated flexible guide cable threading aid. The aid is installed inside a conduit and includes a flexible guide head. The forward end of the flexible guide head has a magnetically aspirated module 2, which, in conjunction with an external magnetic component, positions the flexible guide head in the forward direction. The rear end of the flexible guide head has an adapter interface 3 connected to a threading wire 4. The magnetically aspirated module 2, the flexible guide head, and the adapter interface 3 are sequentially connected to form a strip-like structure for guiding the threading wire 4. This application is applicable to conduit networks with multiple branches and complex bends, such as integrated cabling systems in large buildings. Specifically, a magnetic component is installed outside the conduit, with the magnetic poles opposite to those of the aid. By utilizing the magnetic field generated by the magnet (magnetic component), the magnetic component penetrates the non-magnetic conduit wall and magnetically couples (attracts) with the magnetically aspirated module 2 inside the conduit, thereby guiding the forward movement or deflection of the internal magnetically aspirated module 2 through the movement of the external magnet. In some preferred embodiments, the flexible guide head is composed of 3-5 flexible units 1 connected in series, with adjacent flexible units 1 connected by a miniature connecting shaft 5. By disassembling the flexible guide head into 3-5 independent flexible units 1, the flexibility of each individual flexible unit 1 along the pipeline route is increased. This allows the series of flexible units 1 to swing through sequentially under the drive of the miniature connecting shaft 5, solving the problem of high jamming rate of traditional rigid steel wire in long-distance, multi-bend pipelines. The jamming rate is reduced, the metal pipe threading time is shortened, and the overall threading efficiency is greatly improved.

[0036] In some preferred embodiments, the foremost flexible unit 1 of the flexible guide head is a hemispherical end 11, with a 0.1-0.2 mm thick polytetrafluoroethylene coating 12 sprayed on its surface, having a friction coefficient ≤0.15. This design can further assist in reducing threading resistance.

[0037] In some embodiments, the miniature connecting shaft 5 has a diameter of 2-3 mm and a length of 12-15 mm (e.g., 12 mm, 13 mm, or 15 mm). The outer surface of the miniature connecting shaft 5 has shaft holes at opposite ends, and the flexible unit 1 has its two ends embedded in these shaft holes, thus connecting the flexible unit 1 to the miniature connecting shaft 5. Based on this connection method, the connection between the flexible unit 1 and the miniature connecting shaft 5 is more stable, improving the success rate of threading. Simultaneously, through the connection between the flexible units 1 and the miniature connecting shaft 5, the miniature connecting shaft 5 can swing in the direction of movement of the flexible unit 1, providing high flexibility.

[0038] In some preferred embodiments, the flexible unit 1 is made of nylon 66 wire with a diameter of 8-10 mm (e.g., 8 mm, 9 mm, etc.) and a length of 10-15 mm (e.g., 10 mm, 12 mm, 13 mm, or 15 mm, etc.), and a coefficient of friction ≤0.2. Nylon 66 has high tensile strength and surface hardness, enabling it to withstand large loads and pressures without easily deforming or being damaged, making it suitable for manufacturing structural components such as gears, bearings, housings, and tool handles; it also possesses excellent toughness (impact resistance), making it less prone to breakage even under impact. Based on the durability of nylon 66, the overall structure of the flexible guide head is stable, able to withstand wear from repeated threading operations, and extending its service life.

[0039] In this embodiment, the magnetic module 2 is a neodymium iron boron strong magnet with a magnetic strength of 800-1200 gauss, located at the frontmost flexible unit 1. In use, by embedding the 800-1200 gauss neodymium iron boron strong magnet in the frontmost flexible unit 1, and in conjunction with an external magnet, precise positioning can be achieved, solving the problem of difficult positioning and the need for repeated attempts required by traditional tools in scenarios such as buried conduits.

[0040] In this embodiment, the adapter interface 3 is adapted to the connecting section of the flexible unit 1 at the rear end of the flexible guide head, with a length of 10-15mm (e.g., 10mm, 11mm, 13mm, or 15mm) and a diameter of 6-8mm. The outer edge of the adapter interface 3 is provided with an M3-M4 external thread or an elastic buckle to accommodate Φ2-3mm threading steel wire 4 or nylon wire. In use, by designing the adapter interface 3 as a threaded or buckle structure, it can be compatible with existing Φ2-3mm threading steel wire 4 or nylon wire, without the need to replace the entire set of tools, making it easy to promote and apply in existing construction scenarios.

[0041] Example 2

[0042] A method for using a magnetically attached flexible guide threading aid, the method comprising the following steps:

[0043] Step 1: The magnetic suction module 2, the flexible guide head, and the adapter interface 3 are sequentially connected to form a strip-shaped auxiliary device, which is used to guide the wire 4. The adapter interface 3 is connected to the wire 4 to be threaded. The front end of the flexible guide head is fed into the inlet of the conduit.

[0044] Step 2: Using external tools, apply pushing / pulling force to advance the auxiliary device forward. The flexible guide head bends naturally with the pipeline, driving the threading steel wire 4 at its tail end forward. The flexible guide head bends naturally with the pipeline. Specifically, the flexible guide head includes 3 to 5 flexible units 1 arranged in series. Adjacent flexible units 1 are movably connected by a miniature connecting shaft 5, so that each flexible unit 1 can make independent turning movements and bend adaptively with the direction of the pipeline.

[0045] Step 3: When the auxiliary device approaches the target outlet, the magnet outside the conduit senses the position of the magnetic module 2 on the auxiliary device through magnetic force, guides it to accurately align with the outlet, and moves forward.

[0046] Step 4: The auxiliary device is pulled out from the target outlet under the guidance of the magnet outside the tube, and then drives the threading steel wire 4 / nylon wire at its tail end to realize the threading operation.

[0047] In summary, the auxiliary device provided in this application, by designing "flexible guidance + magnetic positioning" into a collaborative working structure, not only leverages the anti-jamming advantage of the flexible structure but also achieves precise threading through the magnetic function. Compared with single-function tools in the prior art (such as fixed structure guide heads or rigid magnetic heads), it performs better in complex pipeline threading scenarios.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A magnetically aspirated flexible guide threading aid, characterized in that, The auxiliary device is located inside the conduit and includes a flexible guide head. The forward end of the flexible guide head is provided with a magnetic suction module (2). The magnetic suction module (2) works with the external magnetic suction component of the conduit to position the forward direction of the flexible guide head. The adapter interface (3) at the tail end of the flexible guide head is connected to the threading steel wire (4). The magnetic suction module (2), flexible guide head, and adapter interface (3) are connected in sequence to form a strip for guiding the threaded steel wire.

2. The magnetic flexible guide threading aid according to claim 1, characterized in that, The flexible guide head is composed of 3-5 flexible units (1) connected in series, and adjacent flexible units (1) are connected by a micro-connecting shaft (5).

3. The magnetic flexible guide threading aid according to claim 2, characterized in that, The micro-connecting shaft (5) has a diameter of 2-3 mm and a length of 12-15 mm. The outer surfaces of the micro-connecting shaft (5) are provided with shaft holes at opposite positions. The flexible unit (1) is embedded in the shaft holes at both ends, so that the flexible unit (1) is connected to the micro-connecting shaft (5).

4. A magnetically aspirated flexible guide threading aid according to claim 2, characterized in that, The flexible unit (1) is made of nylon 66 wire with a diameter of 8-10 mm, a length of 10-15 mm, and a friction coefficient of ≤0.

2.

5. A magnetic flexible guide threading aid according to claim 1, characterized in that, In the flexible guide head, the foremost flexible unit (1) is a hemispherical end (11), and its surface is coated with a 0.1-0.2mm thick polytetrafluoroethylene coating (12), with a friction coefficient ≤0.

15.

6. A magnetically aspirated flexible guide threading aid according to claim 1, characterized in that, The magnetic module (2) is a neodymium iron boron strong magnet set at the frontmost flexible unit (1), with a magnetic strength of 800-1200 Gauss.

7. A magnetically aspirated flexible guide threading aid according to claim 1, characterized in that, The adapter interface (3) is located at the connection end of the flexible unit (1) at the last end of the flexible guide head, and its length is 10-15mm and its diameter is 6-8mm.

8. A magnetically aspirated flexible guide threading aid according to claim 7, characterized in that, The adapter interface (3) has an M3-M4 external thread or elastic buckle on its outer edge, which can be used to fit Φ2-3mm threading steel wire (4) or nylon wire.

9. A method of using the magnetically attached flexible guide threading aid as described in claim 1, characterized in that, The method includes the following steps: Step 1: The magnetic suction module (2), flexible guide head, and adapter interface (3) are connected in sequence to form an auxiliary device in the shape of a strip, which is used to guide the wire being threaded; the adapter interface (3) is connected to the wire (4) / nylon wire to be threaded, and the front end of the flexible guide head is sent into the wire tube inlet; Step 2: Use external tools to apply pushing / pulling force to push the auxiliary device forward. The flexible guide head bends naturally with the pipeline, driving the steel wire / pull at its tail end forward. Step 3: When the auxiliary device approaches the target outlet, the external magnet senses the position of the magnetic attraction module (2) on the auxiliary device through magnetic force and guides it to align with the outlet; Step 4: After the auxiliary device is pulled out from the target outlet, it drives the threading steel wire (4) / nylon wire located at its tail end to realize the threading operation.

10. The method of using the magnetic flexible guide threading aid according to claim 9, characterized in that, The flexible guide head described in step two bends naturally with the pipeline. Specifically, the flexible guide head includes 3 to 5 flexible units (1) arranged in series. Adjacent flexible units (1) are movably connected by a micro connecting shaft (5), so that each flexible unit (1) can make independent turning movements and bend adaptively with the pipeline.

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