A threaded sleeve connector for non-fire connection of round steel grounding bodies

Abstract

The present invention discloses a threaded sleeve connector for non-fire connection of round steel grounding bodies, comprising a double-ended sleeve, two locking nuts, and a retaining rope. The double-ended sleeve comprises a straight middle portion and tapered portions at both ends, wherein the tapered portions are provided with deformable slits evenly along their circumferential direction. The inner hole of the locking nut is a tapered reducing hole, wherein the inner wall of the tapered reducing hole is provided with an internal thread, and the locking nut can be screwed onto the tapered portion of the double-ended sleeve. A wrench ring is provided on the outer fixed sleeve of the straight middle portion of the double-ended sleeve, wherein the wrench ring is provided with a plurality of first retaining holes evenly along its circumferential direction. The locking nut is provided with a plurality of second retaining holes evenly along its circumferential direction, wherein the axes of the second retaining holes are parallel to the axis of the locking nut. The retaining rope passes through the second retaining hole of the locking nut at one end, the first retaining hole of the wrench ring, and the second retaining hole of the locking nut at the other end in sequence to form a closed loop, thereby achieving locking and retaining of the locking nuts at both ends and the double-ended sleeve.

Description

Technical Field

[0001] The invention relates to the technical field of grounding equipment, and in particular to a threaded sleeve connector for non-fire connection of round steel grounding bodies. Background Art

[0002] Transmission line tower grounding systems are a crucial component of transmission lines and serve as a general term for the grounding body and grounding down conductor. Their function is to ensure the reliable discharge of lightning current to the earth, protect the insulation of line equipment, reduce line tripping rates due to lightning strikes, improve operational reliability, and prevent personal injury from step voltages. When flammable or explosive gases, liquids, or dust are present near transmission lines, hot work during construction can cause explosions, resulting in serious harm to construction workers and surrounding facilities.

[0003] The non-fire operation construction of the distribution network transmission line ground grid has the following forms:

[0004] Mechanical crimping technology: Using a specialized hydraulic crimping tool, the grounding body is crimped to the connecting terminal or wire through the pressure generated by the hydraulic system. This method is relatively simple to operate, offers stable crimping quality, and can complete the connection quickly without the need for flames. Alternatively, the grounding body can be connected using connectors such as bolts, nuts, and washers. First, a hole is drilled in the connection area of ​​the grounding body, then the bolt is passed through the hole and tightened with a nut. To ensure the reliability and conductivity of the connection, conductive paste is usually applied to the connection area, and spring washers or other anti-loosening devices are used to prevent the bolts from loosening. This mechanical bolt connection method is widely used in the construction of grounding networks for power transmission lines in mountainous areas where fire protection requirements are strict.

[0005] Chemical bonding technology utilizes the high temperatures generated by thermite reaction to melt and fuse the metal materials at the connection point, forming a permanent connection. This method requires no external power source or hot metal, is simple to operate, and offers high-quality connections with excellent conductivity and corrosion resistance. During installation, the grounding elements to be connected are placed in a specially designed mold, an appropriate amount of solder powder is added, and an initiator is ignited. This triggers a thermite reaction, generating high temperatures that melt the metals. After cooling, the connection is complete. Alternatively, a chemical adhesive with excellent conductivity and bonding properties can be used to bond the grounding elements together.

[0006] Pre-twisted fitting connection technology: A pre-twisted grounding ring is a fitting specifically designed for grounding connections. It consists of multiple strands of pre-twisted wire. To use, a round or flat grounding steel bar is inserted into the ring's center hole. The pre-twisted wire is then tightly wrapped around the grounding body, leveraging the wire's elasticity and friction to create a connection. This connection method is quick and easy to install, requiring no hot metal or special tools, and offers excellent electrical and mechanical properties. Summary of the Invention

[0007] The present invention enriches the technical route of the non-fire connection of round steel grounding bodies and provides a threaded sleeve connector for the non-fire connection of round steel grounding bodies that is different from the prior art.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions: a threaded sleeve connector for non-fire connection of round steel grounding body, comprising a double-headed sleeve, two locking nuts and a stop rope;

[0009] The double-ended sleeve comprises a middle straight cylindrical portion and two end tapered cylindrical portions, the large diameter end of the tapered cylindrical portion being connected to the middle straight cylindrical portion, the outer wall of the tapered cylindrical portion being provided with an external thread, and the tapered cylindrical portion being provided with deformation slits uniformly along its circumference, one end of the deformation slit being opened at the small diameter end of the tapered cylindrical portion and extending along the length direction of the tapered cylindrical portion to the large diameter end of the tapered cylindrical portion;

[0010] The inner hole of the locking nut is a tapered reducing hole, and the inner wall of the tapered reducing hole is provided with an internal thread. The locking nut can be screwed onto the tapered cylinder portion of the double-headed sleeve, and moves along the axial direction of the tapered cylinder portion through the thread cooperation between the tapered reducing hole and the tapered cylinder portion, and the thread rotation directions of the tapered cylinder portions at both ends of the double-headed sleeve are opposite;

[0011] The outer fixed sleeve of the middle straight tube portion of the double-headed sleeve is provided with a wrench ring, and the wrench ring is evenly provided with a plurality of first anti-retraction holes along its circumferential direction, and the axes of the first anti-retraction holes are parallel to the axis of the wrench ring;

[0012] The locking nut is evenly provided with a plurality of second anti-recession holes along its circumferential direction, and the axes of the second anti-recession holes are parallel to the axis of the locking nut;

[0013] The anti-retraction rope passes through the second anti-retraction hole of the locking nut at one end, the first anti-retraction hole of the twisting ring and the second anti-retraction hole of the locking nut at the other end in sequence to form a closed loop, thereby realizing the locking and anti-retraction of the locking nuts at both ends and the double-headed sleeve.

[0014] As a further optimization of the threaded sleeve connector for non-fire connection of round steel grounding bodies according to the present invention: the two ends of the anti-retreat rope are fixedly connected after the closed loop through a locking head, and the locking head includes an outer tube and a core rod, the outer tube is a cylinder with one end closed and the other end open, the closed section of which can be inserted into the second anti-retreat hole of the locking nut, and a retaining ring is provided at the open end, and a thread is provided on the inner wall of the outer tube, and the core rod includes a coaxially arranged threaded portion, a winding portion and a screwing portion, the threaded portion of the core rod can be screwed into the outer tube, the outer diameter of the winding portion is smaller than the outer diameter of the threaded portion, and a threading hole is provided along its radial direction near the threaded portion of the winding portion, one end of the anti-retreat rope is fixed to the closed end of the outer tube, and the other end is fixedly connected to the core rod after passing through the threading hole.

[0015] As a further optimization of the threaded sleeve connector for non-fire connection of round steel grounding bodies of the present invention: the free end of the anti-retreat rope is provided with a threading rod, the middle part of the threading rod is provided with a through hole, a pin is passed through the through hole, the length direction of the pin and the threading rod are perpendicular to each other, and the anti-retreat rope is sleeved on the pin.

[0016] As a further optimization of the threaded sleeve connector for non-fire connection of round steel grounding bodies of the present invention: the diameter ratio of the small diameter end to the large diameter end of the tapered cylinder part is 0.7-0.9.

[0017] As a further optimization of the threaded sleeve connector for non-fire connection of round steel grounding bodies of the present invention: the inner wall of the conical cylinder portion is provided with textures that increase friction.

[0018] As a further optimization of the threaded sleeve connector for non-fire connection of round steel grounding bodies of the present invention: the outer peripheries of the torque ring and the locking nut are both regular hexagons.

[0019] As a further optimization of the threaded sleeve connector for non-fire connection of round steel grounding bodies of the present invention: at least three deformation seams are provided.

[0020] As a further optimization of the threaded sleeve connector for non-fire connection of round steel grounding bodies of the present invention: the width of the deformation seam is 1 / 6-1 / 5 of the diameter of the small diameter end of the tapered cylinder part, and the length of the deformation seam is 5 / 7-5 / 6 of the length of the tapered cylinder part.

[0021] As a further optimization of the threaded sleeve connector for non-fire connection of round steel grounding bodies of the present invention: at least two anti-retraction ropes are provided, and the anti-retraction ropes are stainless steel wire ropes or galvanized iron wire ropes.

[0022] As a further optimization of the threaded sleeve connector for the non-fire connection of round steel grounding bodies of the present invention: the double-headed sleeve is a copper sleeve, a stainless steel sleeve or a copper-clad steel sleeve

[0023] The present invention has the following beneficial effects:

[0024] The present invention inserts the round steel grounding body to be connected into the double-ended sleeve from both ends. The tapered internal threads of the tapered thread locking nut are screwed into the tapered external threads of the tapered thread connecting sleeve. The open grooves distributed along the circumference of the tapered thread connecting sleeve are squeezed and contracted, so that the tapered thread connecting sleeve firmly embraces the round steel grounding body to be connected, thereby achieving a secure connection. Furthermore, the interaction of the first and second retaining holes and the retaining rope can achieve retaining and locking of the nuts at both ends, ensuring an effective grounding connection.

[0025] While reducing construction complexity, the present invention also brings significant cost savings. First, there is the reduction in labor costs. Since professional welders are not required, the cost of hiring highly skilled workers is reduced. Second, there is the saving in time costs. The simplified construction process speeds up construction and shortens the construction period of the entire project. For example, in a power transmission line grounding connection project, if traditional welding processes may take several days, it can be completed in just a few hours using the technology of the present invention. This reduction in labor and time costs improves construction efficiency, giving the project a clear advantage in both economic benefits and construction progress control. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a double-ended sleeve in the sleeve connector of the present invention;

[0027] Figure 2 Schematic diagram of the structure of the locking nut in the sleeve connector of the present invention;

[0028] Figure 3 Schematic diagram of the structure of the double-ended sleeve and the locking nut after assembly in the sleeve connector of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of the sleeve connector of the present invention after the connection is completed;

[0030] Figure 5 Schematic diagram of the structure of the locking head (unlocked state) in the sleeve connector of the present invention;

[0031] Figure 6 Schematic diagram of the structure of the locking head (locked state) in the sleeve connector of the present invention;

[0032] Figure 7 Schematic diagram of the structure of the threading rod in the sleeve connector of the present invention;

[0033] Markings in the figure:

[0034] 1. Double-ended casing;

[0035] 2. Lock nut;

[0036] 3. Stop rope;

[0037] 4. Locking head;

[0038] 5. Threading rod;

[0039] 6. Pin;

[0040] 7. Round steel grounding body;

[0041] 101, middle straight tube;

[0042] 102, cone part;

[0043] 1011, twist ring;

[0044] 1012, first stop hole;

[0045] 1021, deformation seam;

[0046] 201, second stop hole;

[0047] 401. Outer cylinder;

[0048] 4011, retaining ring;

[0049] 402, mandrel;

[0050] 4021, threaded portion;

[0051] 4022, winding unit;

[0052] 4023, screwing part;

[0053] 4024, threading hole. DETAILED DESCRIPTION

[0054] In order to better understand the present invention, the content of the present invention is further illustrated below in conjunction with examples, but the content of the present invention is not limited to the following examples.

[0055] As shown in the figure: a threaded sleeve connector for non-fire connection of round steel grounding bodies, including a double-headed sleeve 1, two locking nuts 2 and a retaining rope 3.

[0056] In this embodiment, the double-headed sleeve 1 is made of copper material, which can effectively ensure the grounding effect due to its good electrical conductivity. The double-headed sleeve 1 is composed of a middle straight tube portion 101 and a tapered tube portion 102 at both ends. The outer fixed sleeve of the middle straight tube portion 101 is provided with a wrench ring 1011, and the outer circumference of the wrench ring 1011 is a regular hexagon. This shape is convenient for operation with tools such as wrenches, and the double-headed sleeve 1 can be installed and disassembled more efficiently. The wrench ring 1011 is evenly distributed with multiple first anti-retraction holes 1012 along the circumferential direction. In this embodiment, 6 first anti-retraction holes 1012 are provided. The axis of the first anti-retraction hole 1012 is parallel to the axis of the wrench ring 1011. Its function is to cooperate with the anti-retraction rope 3 to realize the anti-retraction function.

[0057] The large diameter ends of the conical cylinder portion 102 at both ends are welded to the middle straight cylinder portion 101 to ensure a stable structure. The diameter ratio of the small diameter end to the large diameter end of the conical cylinder portion 102 is set to 0.8. This ratio can ensure that when the locking nut 2 is tightened, the conical cylinder portion 102 has enough shrinkage space to hold the round steel grounding body tightly, and can also maintain its own structural strength. The outer wall of the conical cylinder portion 102 is processed with an external thread to facilitate cooperation with the locking nut 2. The conical cylinder portion 102 is evenly provided with deformation seams 1021 along the circumferential direction. In this embodiment, 4 deformation seams 1021 are provided. The width of the deformation seam 1021 is 1 / 5 of the diameter of the small diameter end of the conical cylinder portion 102, and the length is 5 / 6 of the length of the conical cylinder portion 102. One end of the deformation seam 1021 is opened from the small diameter end of the conical cylinder portion 102 and extends to the large diameter end along the length direction of the conical cylinder portion 102. In addition, the inner wall of the conical cylinder portion 102 is processed with fine straight lines to increase the friction between the conical cylinder portion 102 and the round steel grounding body, further improving the firmness of the connection.

[0058] The inner bore of the locking nut 2 is a tapered reducing hole, with an inner wall provided with internal threads that match the external threads of the tapered portion 102 of the double-ended sleeve 1. The outer periphery of the locking nut 2 is also designed as a regular hexagon, facilitating tool manipulation. Multiple second anti-retraction holes 201 are evenly arranged along the circumference, corresponding in number to the first anti-retraction holes 1012 on the wrench ring 1011, and in this embodiment, there are also six. The axes of the second anti-retraction holes 201 are parallel to the axis of the locking nut 2, and are used to pass the anti-retraction cable 3 to prevent the backlash.

[0059] The anti-retraction rope 3 is made of stainless steel wire rope, with a total of 2 sets. Stainless steel wire rope has good strength and corrosion resistance, and can work stably for a long time in complex outdoor environments, ensuring the reliable anti-retraction function.

[0060] When connecting the round steel grounding body 7, the two round steel grounding bodies 7 to be connected are respectively inserted from the two ends of the double-headed sleeve 1 so that the round steel grounding body 7 is located in the conical cylinder 102. Subsequently, the two locking nuts 2 are screwed onto the conical cylinder 102 at both ends of the double-headed sleeve 1. Since the inner hole of the locking nut 2 is a conical reducing hole, during the screwing process, as the locking nut 2 moves axially along the conical cylinder 102, its conical internal thread exerts an extrusion effect on the external thread of the conical cylinder 102. Due to the presence of the deformation seam 1021, the conical cylinder 102 will shrink in the circumferential direction under extrusion, thereby firmly holding the round steel grounding body 7. At the same time, since the thread rotation directions of the conical cylinder 102 at both ends of the double-headed sleeve 1 are opposite, the double-headed sleeve 1 can be prevented from rotating as a whole during the tightening process. After the two locking nuts 2 are tightened into place, the two anti-retraction ropes 3 are respectively passed through the second anti-retraction hole 201 of the locking nut 2 at one end, the first anti-retraction hole 1012 of the twisting ring 1011 and the second anti-retraction hole 201 of the locking nut 2 at the other end, and then the two ends of the anti-retraction ropes 3 are fixed to form a closed loop. This effectively prevents the locking nut 2 from loosening during use, ensuring the stability and reliability of the grounding connection.

[0061] The two ends of the anti-retraction rope 3 are fixedly connected after the closed loop through the locking head 4. The locking head 4 includes an outer cylinder 401 and a core rod 402. The outer cylinder 401 is a cylinder with one end closed and the other end open. The closed end can be inserted into the second anti-retraction hole 201 of the locking nut 2. The open end is provided with a retaining ring 4011. The outer diameter of the retaining ring 4011 is larger than the diameter of the second anti-retraction hole 201. The inner wall of the outer cylinder 401 is provided with a thread. The core rod 402 includes a coaxially arranged screw thread. The threaded portion 4021, the winding portion 4022 and the screwing portion 4023, the threaded portion of the core rod 402 can be screwed into the outer tube 401, the outer diameter of the winding portion 4022 is smaller than the outer diameter of the threaded portion 4021, and the winding portion 4022 is provided with a threading hole 4024 arranged along its radial direction near the threaded portion 4021, one end of the anti-retraction rope 3 is fixed to the closed end of the outer tube 401, and the other end can pass through the threading hole 4024 and be fixedly connected to the core rod 402.

[0062] The free end of the anti-retraction rope 3 is provided with a threading rod 5, and the middle part of the threading rod 5 is provided with a through hole, and a pin 6 is passed through the through hole. The length direction of the pin 6 and the threading rod 5 is perpendicular to each other, and the anti-retraction rope 3 is sleeved on the pin 6 (see Figure 7 ).

[0063] The threading rod 5 on the anti-retraction rope 3 facilitates the anti-retraction rope 3 to pass through the first anti-retraction hole 1012 and the second anti-retraction hole 201. After the anti-retraction rope 3 forms a closed loop, the threading rod 5 is passed through the threading hole 4024 of the winding part 4022 and the threading rod 5 is rotated so that the threading rod 5 is perpendicular to the anti-retraction rope 3. The threading rod 5 cannot escape from the threading hole 4024, thus achieving a fixed connection between the free end of the anti-retraction rope 3 and the core rod 402 (see FIG. Figure 5 ), at this time, the core rod 402 is rotated by the screwing portion 4023, and the core rod 402 moves toward the bottom of the outer tube 401. During this process, the anti-retraction rope 3 is wound around the winding portion 4022 of the core rod 402, thereby tightening and locking the anti-retraction rope 3 (see Figure 6 ).

[0064] The process of grounding connection construction using the sleeve connector of the present invention is as follows:

[0065] Construction preparation: According to the design requirements, prepare round steel grounding bodies of corresponding specifications, copper double-ended sleeves 1, locking nuts 2 and stainless steel wire rope stoppers 3, and also prepare installation tools such as wrenches.

[0066] Inserting round steel into double-ended sleeve: slowly insert one end of the two round steel grounding bodies from both ends of the double-ended sleeve 1, ensuring that the round steel grounding bodies are inserted into the cone part 102 to an appropriate depth. Generally, the insertion depth reaches about 2 / 3 of the length of the cone part 102.

[0067] Install the locknuts: Take two locknuts 2 and screw them onto the tapered sections 102 at each end of the double-ended sleeve 1. Use a wrench to grip the hexagonal outer periphery of the locknut 2 and tighten in the correct direction (matching the external threads of the tapered sections 102 at each end of the double-ended sleeve 1). During the tightening process, carefully observe the deformation of the tapered sections 102 to ensure that they evenly contract and grip the round steel grounding body. When the tightening resistance noticeably increases, it is presumed that the proper tightening has been achieved.

[0068] Install the anti-retraction rope: insert the two stainless steel wire rope anti-retraction ropes 3 from the second anti-retraction hole 201 of the locking nut 2 at one end, then pass through the corresponding first anti-retraction hole 1012 on the twist ring 1011, and finally pass out from the second anti-retraction hole 201 corresponding to the locking nut 2 at the other end. After passing through, fix the two ends of the anti-retraction rope 3 with the locking head 4 to form a closed loop, completing the entire connection construction. When the closed loop is completed, the outer tube 401 of the locking head 4 is inserted into the second anti-retraction hole 201 of the locking nut 2, and is blocked by the retaining ring 4011. After the construction is completed, check the connection parts to ensure that all components are firmly installed and the anti-retraction rope 3 is securely fixed without any looseness.

[0069] After testing, it was found that when the connector of this embodiment was used in a 10kV substation grounding project, the single-point connection time was shortened from 30 minutes for traditional welding to 8 minutes, and the grounding resistance value was stably up to standard, increasing construction efficiency by more than 70%.

[0070] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various variations or modifications within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A threaded sleeve connector for non-fire connection of round steel grounding bodies, characterized by: It comprises a double-ended sleeve (1), two locking nuts (2) and a stop rope (3); The double-headed sleeve (1) comprises a middle straight cylinder portion (101) and two end conical cylinder portions (102), the diameter ratio of the small diameter end to the large diameter end of the conical cylinder portion (102) is 0.7-0.9, the large diameter end of the conical cylinder portion (102) is connected to the middle straight cylinder portion (101), the outer wall of the conical cylinder portion (102) is provided with an external thread, and the conical cylinder portion (102) is uniformly provided with deformation slits (1021) along its circumferential direction, one end of the deformation slit (1021) is opened at the small diameter end of the conical cylinder portion (102), and extends along the length direction of the conical cylinder portion (102) to the large diameter end of the conical cylinder portion (102); The inner hole of the locking nut (2) is a tapered reducing hole, and the inner wall of the tapered reducing hole is provided with an internal thread. The locking nut (2) can be screwed onto the tapered cylinder portion (102) of the double-headed sleeve (1), and moves along the axial direction of the tapered cylinder portion (102) through the thread cooperation between the tapered reducing hole and the tapered cylinder portion (102), and the thread rotation directions of the tapered cylinder portions (102) at both ends of the double-headed sleeve (1) are opposite; The middle straight tube portion (101) of the double-headed sleeve (1) is provided with a wrench ring (1011) on the outer fixed sleeve. The wrench ring (1011) is evenly provided with a plurality of first stop holes (1012) along its circumferential direction. The axes of the first stop holes (1012) and the axis of the wrench ring (1011) are parallel to each other. The locking nut (2) is evenly provided with a plurality of second anti-recession holes (201) along its circumferential direction, and the axes of the second anti-recession holes (201) and the axis of the locking nut (2) are parallel to each other; The anti-retraction rope (3) sequentially passes through the second anti-retraction hole (201) of the locking nut (2) at one end, the first anti-retraction hole (1012) of the twisting ring (1011), and the second anti-retraction hole (201) of the locking nut (2) at the other end to form a closed loop, thereby achieving locking and anti-retraction of the locking nuts (2) at both ends and the double-head sleeve (1).

2. A threaded sleeve connector for non-fire connection of round steel grounding bodies according to claim 1, characterized in that: The inner wall of the conical cylinder portion (102) is provided with textures for increasing friction.

3. A threaded sleeve connector for non-fire connection of round steel grounding bodies according to claim 1, characterized in that: The outer peripheries of the wrench ring (1011) and the locking nut (2) are both regular hexagons.

4. A threaded sleeve connector for non-fire connection of round steel grounding bodies according to claim 1, characterized in that: At least three deformation slits (1021) are provided.

5. The threaded sleeve connector for non-fire connection of round steel grounding bodies according to claim 1, characterized in that: The width of the deformation slit (1021) is 1 / 6-1 / 5 of the diameter of the small diameter end of the conical cylinder portion (102), and the length of the deformation slit (1021) is 5 / 7-5 / 6 of the length of the conical cylinder portion (102).

6. A threaded sleeve connector for non-fire connection of round steel grounding bodies according to claim 1, characterized in that: At least two of the anti-retraction ropes (3) are provided, and the anti-retraction ropes (3) are stainless steel wire ropes or galvanized iron wire ropes.

7. A threaded sleeve connector for non-fire connection of round steel grounding bodies according to claim 1, characterized in that: The double-ended casing (1) is a copper casing, a stainless steel casing or a copper-clad steel casing.

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