A method for connecting overhead transmission lines

Abstract

The present invention provides a method for connecting overhead power transmission lines. The method adopts a connecting device to connect the connecting ends of two wires through molten metal liquid and a connecting pipe, thereby replacing the original cumbersome wire end connection method. The wire connection is performed by the device instead of manual labor, eliminating the influence of human factors on the quality of wire connection, reducing the labor intensity of technicians, and improving the quality of wire connection. The connecting pipe is heated by a heating component, so that the metal liquid entering the connecting pipe will not cool down immediately. The metal liquid can evenly fill the internal space of the connecting pipe, further improving the connection quality of the wire.

Description

[0001] This invention is a divisional application of: An overhead power transmission line connection device and connection method (Application date: 2022-04-11 / Application number: 2022103763165) Technical Field

[0002] The present invention relates to the technical field of cable installation, and in particular to a method for connecting overhead power transmission lines. Background Art

[0003] The manufacturing length of overhead transmission lines is limited, and they need to be connected with connecting hardware when the lines are erected. The most widely used conductor connection method in existing projects is hydraulic connection. Its main work process includes stripping the aluminum wire part of the steel-core aluminum stranded wire, socketing the steel core and the steel pipe, and socketing the aluminum pipe and the steel-core aluminum stranded wire. The use of hydraulic presses is relatively complicated. During the crimping process, the steel core of the steel-core aluminum stranded wire is easily damaged, and the pipe is stuck when inserting the pipe. In addition, the operating technicians need to have certain operating experience to ensure good crimping quality. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that manual connection of overhead power transmission lines in the prior art is difficult and the quality is uncontrollable.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is: a method for connecting overhead power transmission lines, using a connecting device, the connecting device including a conductor, a connecting pipe, a lower heating plate, a base, an arc-shaped receiving groove, a plug, a jack, an upper heating plate, a workbench, a foot, a roller, a chute, a roller, a filling box, a filling pipe, a liquid filling hole, a valve, a first resistance wire, a pressure pump, an air duct, a second resistance wire and a liquid drain hole;

[0006] The connection method includes the following steps:

[0007] S1: Insert the connecting ends of the two wires to be connected into the two ends of the connecting tube to a certain depth, place the connecting tube in the lower heating plate, place the lower heating plate in the arc-shaped receiving groove provided on the base, and connect the upper heating plate to the lower heating plate through the plug and jack;

[0008] S2: The workbench is slid onto the base by cooperating the rollers on the legs at the bottom of the workbench with the slide grooves on the base. The position of the workbench is adjusted by the legs and rollers that can be raised and lowered so that the filling pipe at the bottom of the filling box is inserted into the filling hole on the connecting pipe.

[0009] S3: Close the valve on the filling pipe, put the tin-lead metal block to be melted into the filling tank, and energize the first resistance wire to melt the tin-lead metal block;

[0010] S4: Power on the pressure pump, open the valve, and input air into the filling tank through the air conduit, injecting the metal solution in the filling tank into the connecting pipe. At the same time, power on the second resistance wire to make the temperature in the connecting pipe reach the melting point of the tin-lead metal block;

[0011] S5: When the metal solution is discharged from the drain hole of the connecting pipe, close the valve on the filling pipe, cut off the power to the first resistance wire and the second resistance wire, and after the tin-lead metal solution solidifies, polish the filling hole and drain hole on the connecting pipe to make the surface of the connecting pipe flat and smooth.

[0012] Preferably, the connecting device includes a base, a workbench arranged on the base and a connecting pipe, the workbench is provided with a filling component that can melt metal and inject the molten metal into the connecting pipe, the base is provided with a heating component that can be connected into a tubular shape through two heating tiles and heat the space inside the tube, the two ends of the connecting pipe are coaxially provided with openings for inserting wires, and the outer wall of the connecting pipe is in contact with the inner wall of the heating component.

[0013] Preferably, a pressure pump is further provided on the workbench, and the output end of the pressure pump is connected to the top of the filling assembly through an air conduit.

[0014] Preferably, the filling assembly includes a filling box for accommodating and melting metal, and an annular sealed cavity covering its internal cavity is also provided in the side wall of the filling box, and a first heat-conducting layer, a first heating layer and a first heat-insulating layer are sequentially provided in the sealed cavity from the inside to the outside, wherein a first resistance wire spirally wound around the axis of the filling box is provided in the first heating layer, the first heat-conducting layer is filled with crystalline magnesium oxide powder, and the first heat-insulating layer is filled with glass fiber.

[0015] Preferably, the first heating layer is connected to the first heat-conducting layer, and the first heat-insulating layer covers both ends and the outer peripheral surface of the first heating layer.

[0016] Preferably, a filling pipe for outputting molten metal is provided at the bottom end of the filling box, a liquid injection hole for inserting the filling pipe is provided at the top of the peripheral surface of the connecting pipe, a liquid drainage hole is provided at the top of the peripheral surface of the connecting pipe, and a valve is provided on the filling pipe.

[0017] Preferably, the workbench is supported by legs evenly arranged at the bottom thereof, the legs being retractable rods, the bottom ends of the legs being rotatably provided with rollers, and the top surface of the base being provided with a slide groove for accommodating the rollers.

[0018] Preferably, the heating assembly includes a lower heating plate and an upper heating plate with an arc-shaped cross-section, and a second resistance wire is provided in the lower heating plate and the upper heating plate. The lower heating plate and the upper heating plate simultaneously realize the connection between the plate and the internal circuit through the jack and plug respectively provided on the docking surface.

[0019] Preferably, an arc-shaped sealed cavity is provided inside the lower heating plate and the upper heating plate, and a second heat-conducting layer, a second heating layer and a second heat-insulating layer are provided inside the arc-shaped sealed cavity from the inside to the outside, and the two ends of the second heat-insulating layer cover the two ends of the second heating layer.

[0020] Preferably, the connecting tube includes a tube body and sealing rubber rings coaxially arranged at both ends of the tube body, a through hole for inserting the wire is provided in the middle of the sealing rubber ring, and the sealing rubber ring is made of fluororubber.

[0021] 1. The present invention provides a method for connecting overhead power transmission lines, which connects the connection ends of two wires through molten metal liquid and a connecting pipe, replacing the original cumbersome wire end connection method. The wire connection is performed by equipment instead of manual labor, eliminating the influence of human factors on the quality of wire connection, reducing the labor intensity of technicians, and improving the quality of wire connection.

[0022] 2. The connecting tube is heated by the heating component so that the molten metal entering the connecting tube will not cool down immediately. The molten metal can evenly fill the internal space of the connecting tube, further improving the connection quality of the wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and examples:

[0024] Figure 1 1 is a structural isometric diagram of a wire connection device according to an embodiment of the present invention.

[0025] Figure 2 Schematic diagram of the structure of the heating component in an embodiment of the present invention.

[0026] Figure 3 Schematic diagram of the internal structure of the filling assembly in an embodiment of the present invention.

[0027] Figure 4 Schematic diagram of the structure of the filling assembly in an embodiment of the present invention.

[0028] Figure 5 Schematic diagram of the internal structure of the base, heating assembly and connecting pipe in an embodiment of the present invention.

[0029] Figure 6 2 is a cross-sectional view of the filling pipe in an embodiment of the present invention.

[0030] Figure 7 This is a diagram of the first resistance wire winding in the filling assembly in an embodiment of the present invention.

[0031] Figure 8 This is a diagram of the second resistance wire winding in the upper heating plate in an embodiment of the present invention.

[0032] Figure numbers: 1. workbench; 2. pressure pump; 7. air duct; 8. foot; 9. roller; 10. slide; 11. filling pipe; 13. valve; 14. receiving groove; 15. wire; 3. filling assembly; 31. first heat-conducting layer; 32. first heating layer; 33. first heat-insulating layer; 34. filling box; 35. first resistance wire; 36. cover plate; 37. plug; 4. connecting pipe; 41. filling hole; 42. drain hole; 43. sealing rubber ring; 44. glass fiber layer; 45. connecting groove; 5. heating assembly; 51. lower heating plate; 52. upper heating plate; 53. plug; 54. jack; 55. second heat-conducting layer; 56. second heating layer; 57. second heat-insulating layer; 58. heating tile; 59. second resistance wire; 6. base; 61. insulation cavity; 62. layer wall. DETAILED DESCRIPTION

[0033] A method for connecting overhead power transmission lines uses a connecting device, the connecting device being specifically as follows:

[0034] like Figure 1 and Figure 5 As shown, in order to improve the connection quality of the wire 15, the present invention proposes a connection device, comprising a base 6, a workbench 1 disposed on the base 6, and a connecting tube 4. The workbench 1 is provided with a filling assembly 3 capable of melting metal and injecting the molten metal into the connecting tube 4. The base 6 is provided with a heating assembly 5 capable of connecting two heating tiles 58 to form a tube and heating the space inside the tube. The connecting tube 4 has openings coaxially defined at both ends for inserting the wire 15, and the outer wall of the connecting tube 4 is in contact with the inner wall of the heating assembly 5.

[0035] The base 6 is provided with an arc-shaped receiving groove 14 for accommodating the heating assembly 5. The connecting ends of the two wires 15 to be connected are inserted from both ends of the connecting tube 4. The metal is melted by the filling assembly 3 and the molten metal is input into the connecting tube 4. At the same time, the heating assembly 5 is activated to heat the connecting tube 4, maintaining the flow of the molten metal in the connecting tube 4 until the interior of the connecting tube 4 is filled with the molten metal. Finally, the metal solution is allowed to cool, completing the connection of the wires 15.

[0036] The base 6 is provided with a heat-insulating cavity 61 at the bottom thereof through a layer wall 62 to achieve heat insulation between the top and bottom of the base 6 .

[0037] like Figure 1As shown, to ensure that the molten metal fills the interior of the connecting pipe 4, a pressure pump 2 is also provided on the workbench 1. The output end of the pressure pump 2 is connected to the top of the filling assembly 3 via an air conduit 7. The pressure pump 2 is a remote-controlled brushless micro air pump F50-JY / B for both pumping and beating. The gas output by the pressure pump 2 pressurizes the interior of the filling assembly 3 through the air conduit 7, allowing the molten metal inside the filling assembly 3 to quickly flow into the connecting pipe 4 and fill it. At the same time, the pressure pump 2 can also extract the gas expanded by heating in the filling assembly 3 to prevent damage to the device.

[0038] like Figure 1 、 Figure 3 、 Figure 4 and Figure 7 As shown, in order to achieve the melting of metal and the injection of molten metal, the filling assembly 3 includes a filling box 34 for accommodating and melting metal. The side wall of the filling box 34 is also provided with an annular sealed cavity covering its internal cavity. The sealed cavity is provided with a first heat-conducting layer 31, a first heating layer 32, and a first heat-insulating layer 33 from the inside to the outside. The first heating layer 32 is provided with a first resistance wire 35 spirally wound around the axis of the filling box 34. The first heat-conducting layer 31 is filled with crystalline magnesium oxide powder, and the first heat-insulating layer 33 is filled with glass fiber. The first resistance wire 35 in the first heating layer 32 is heated to increase the temperature of the metal block in the filling box 34, thereby achieving the melting of the metal block. The crystalline magnesium oxide powder provided in the first heat-conducting layer 31 has good insulation and thermal conductivity, and can efficiently transfer heat to the metal block. The glass fiber filled in the first heat-insulating layer 33 can both insulate and heat-insulate. An opening is provided at the top of the filling box 34 for placing the metal block, and the opening is sealed by a cover plate 36. An annular protrusion is provided at the top of the opening for supporting the cover plate 36. Three latches 37 are also provided at the top of the filling box 34 for locking the cover plate 36. After the cover plate 36 is placed in the opening, the latches 37 are used to support the top surface of the cover plate 36 to achieve the locking of the cover plate 36, thereby ensuring the sealing of the filling box 34 during the metal heating process.

[0039] like Figure 3 As shown, this enhances the safety factor of the refueling tank 34. The first heating layer 32 is connected to the first heat-conducting layer 31, and the first heat-insulating layer 33 covers both ends and the outer periphery of the first heating layer 32. The first heating layer 32 is completely located between the first heat-conducting layer 31 and the first heat-insulating layer 33, effectively insulating the first heating layer 32. The provision of the first heat-insulating layer 33 also prevents overheating of the outer wall of the refueling tank 34.

[0040] like Figure 1 、 Figure 3 、 Figure 4 and Figure 6As shown, in order to enable the filling box 34 to accurately inject the molten metal into the connecting pipe 4. The bottom end of the filling box 34 is provided with a filling pipe 11 for outputting the molten metal, the top of the circumference of the connecting pipe 4 is provided with an injection hole 41 for the filling pipe 11 to be inserted, the top of the circumference of the connecting pipe 4 is provided with a drainage hole 42, and a valve 13 is provided on the filling pipe 11. The bottom of the filling box 34 is configured to be conical, and the filling pipe 11 is connected to the bottom of the filling box 34. The injection amount of the molten metal is monitored through the drainage hole 42. When the molten metal overflows from the drainage hole 42, it indicates that the connecting pipe 4 is full of molten metal; a glass fiber layer 44 is provided in the hole wall of the injection hole 41, and when the filling pipe 11 is inserted into the injection hole 41, the filling pipe 11 can be tightly connected to the injection hole 41.

[0041] like Figure 1 As shown, to facilitate insertion of the filling tube 11 into the liquid injection hole 41, the workbench 1 is supported by legs 8 evenly arranged at its bottom. The legs 8 are retractable rods with rollers 9 rotatably mounted at their bottom ends. The top surface of the base 6 is provided with a chute 10 for accommodating the rollers 9. The height of the filling tube 11 can be adjusted using the legs 8, and the horizontal position between the filling tube 11 and the liquid injection hole 41 can be adjusted using the rollers 9. The chute 10 is positioned so that the filling tube 11 and the liquid injection hole 41 are aligned.

[0042] like Figure 1 、 Figure 2 、 Figure 5 and Figure 8 As shown, to achieve uniform heating of the connecting tube 4, the heating assembly 5 comprises a lower heating plate 51 and an upper heating plate 52 with an arc-shaped cross section. A second resistance wire 59 is provided in each of the lower and upper heating plates 51, 52. The lower and upper heating plates 51, 52 are connected to the internal circuitry via a socket 54 and a plug 53, respectively, provided on their mating surfaces. The lower heating plate 51 accommodates the connecting tube 4, and the plug 53 on the upper heating plate 52 snaps into the socket 54 on the lower heating plate 51, ensuring that the lower and upper heating plates 51, 52 adhere closely to and cover the outer wall of the connecting tube 4, ensuring uniform heating of the outer wall of the connecting tube 4.

[0043] like Figure 1 、 Figure 2 、 Figure 5 and Figure 8As shown, to achieve heating of the connecting tube 4, the lower heating plate 51 and the upper heating plate 52 are each provided with an arc-shaped sealed cavity. Inside the arc-shaped sealed cavity, a second heat-conducting layer 55, a second heating layer 56, and a second heat-insulating layer 57 are respectively arranged from the inside to the outside. The ends of the second heat-insulating layer 57 cover the ends of the second heating layer 56. A second resistance wire 59 disposed within the second heating layer 56 heats the connecting tube 4 through the second heat-conducting layer 55, preventing the molten metal injected into the connecting tube 4 from rapidly solidifying. This allows the molten metal to completely fill the connecting tube 4, thereby improving the connection quality of the two wires 15.

[0044] like Figure 5 As shown, in order to prevent the metal solution from flowing out from the end of the connecting tube 4. The connecting tube 4 includes a tube body and a sealing rubber ring 43 coaxially arranged at both ends of the tube body. The middle part of the sealing rubber ring 43 is provided with a through hole for the insertion of the wire 15. The sealing rubber ring 43 is made of fluororubber. By utilizing the elasticity of fluororubber, the inner ring of the sealing rubber ring 43 can be tightly fitted with the circumference of the wire 15, thereby improving the sealing performance of the connecting tube 4; by utilizing the high temperature resistance of fluororubber, fluororubber can be used at 250°C. The metal adopts tin-lead alloy with a melting point of 183°C. Not only is the metal easy to melt, but also the normal use of the sealing rubber ring 43 is guaranteed. Both ends of the connecting tube 4 are provided with connecting grooves 45 for accommodating the sealing rubber ring 43.

[0045] A method for connecting an overhead transmission line comprises the following steps:

[0046] S1: Insert the connecting ends of the two wires 15 to be connected into the two ends of the connecting tube 4 to a certain depth, place the connecting tube 4 in the lower heating plate 51, place the lower heating plate 51 in the arc-shaped receiving groove 14 provided on the base 6, and connect the upper heating plate 52 to the lower heating plate 51 through the plug 53 and the jack 54;

[0047] S2: The workbench 1 is slidably placed on the base 6 by engaging the rollers 9 on the legs 8 at the bottom of the workbench 1 with the slide grooves 10 on the base 6. The position of the workbench 1 is adjusted by the elevating legs 8 and rollers 9 so that the filling pipe 11 at the bottom of the filling box 34 is inserted into the filling hole 41 on the connecting pipe 4.

[0048] S3: Close the valve 13 on the filling pipe 11, put the tin-lead metal block to be melted into the filling tank 34, and energize the first resistance wire 35 to melt the tin-lead metal block;

[0049] S4: Power on the pressure pump 2, open the valve 13, and input air into the filling tank 34 through the air conduit 7, injecting the metal solution in the filling tank 34 into the connecting pipe 4. At the same time, power is supplied to the second resistance wire 59 to make the temperature in the connecting pipe 4 reach the melting point of the tin-lead metal block;

[0050] S5: When the metal solution is discharged from the drainage hole 42 of the connecting pipe 4, the valve 13 on the filling pipe 11 is closed, and the first resistance wire 35 and the second resistance wire 59 are powered off. After the tin-lead metal solution solidifies, the injection hole 41 and the drainage hole 42 on the connecting pipe 4 are polished to make the surface of the connecting pipe 4 flat and smooth.

[0051] When connecting the two wires 15, they are connected through the melted tin-lead alloy and the connecting pipe 4, and the metal liquid is injected through the pressure pump 2 in conjunction with the filling box 34, so that the connection ends of the two wires 15 are fully connected through the condensed tin-lead alloy.

Claims

1. A method for connecting overhead power transmission lines, characterized in that: A connecting device is used, which includes a wire (15), a connecting pipe (4), a lower heating plate (51), a base (6), an arc-shaped receiving groove (14), a plug (53), a jack (54), an upper heating plate (52), a workbench (1), a foot (8), a roller (9), a slide groove (10), a roller (9), a filling box (34), a filling pipe (11), a liquid injection hole (41), a valve (13), a first resistance wire (35), a pressure pump (2), an air conduit (7), a second resistance wire (59) and a liquid discharge hole (42); The connection method includes the following steps: S1: Insert the connecting ends of the two wires (15) to be connected into the two ends of the connecting tube (4) to a certain depth, place the connecting tube (4) in the lower heating plate (51), place the lower heating plate (51) in the arc-shaped receiving groove (14) provided on the base (6), and connect the upper heating plate (52) to the lower heating plate (51) through the plug (53) and the jack (54); S2: The workbench (1) is slidably placed on the base (6) by cooperating the rollers (9) on the legs (8) at the bottom of the workbench (1) with the slide grooves (10) on the base (6), and the position of the workbench (1) is adjusted by the legs (8) and rollers (9) that can be raised and lowered so that the filling pipe (11) at the bottom of the filling box (34) is inserted into the filling hole (41) on the connecting pipe (4); S3: closing the valve (13) on the filling pipe (11), adding the tin-lead metal block to be melted into the filling box (34), and energizing the first resistance wire (35) to melt the tin-lead metal block; S4: energize the pressure pump (2), open the valve (13), input air into the filling box (34) through the air conduit (7), inject the metal solution in the filling box (34) into the connecting pipe (4), and simultaneously energize the second resistance wire (59) so that the temperature in the connecting pipe (4) reaches the melting point of the tin-lead metal block; S5: When the metal solution is discharged from the drain hole (42) of the connecting pipe (4), the valve (13) on the filling pipe (11) is closed, and the first resistance wire (35) and the second resistance wire (59) are powered off. After the tin-lead metal solution solidifies, the filling hole (41) and the drain hole (42) on the connecting pipe (4) are polished to make the surface of the connecting pipe (4) flat and smooth.

2. A method for connecting overhead power lines according to claim 1, characterized in that: The connecting device comprises a base (6), a workbench (1) arranged on the base (6), and a connecting pipe (4); the workbench (1) is provided with a filling component (3) capable of melting metal and injecting the molten metal into the connecting pipe (4); the base (6) is provided with a heating component (5) capable of being connected to form a tube through two heating tiles (58) and heating the space inside the tube; openings for inserting a wire (15) are coaxially provided at both ends of the connecting pipe (4); and the outer wall of the connecting pipe (4) is in contact with the inner wall of the heating component (5).

3. A method for connecting overhead power lines according to claim 2, characterized in that: A pressure pump (2) is also provided on the workbench (1), and the output end of the pressure pump (2) is connected to the top of the filling component (3) via an air conduit (7).

4. A method for connecting overhead power lines according to claim 3, characterized in that: The filling assembly (3) includes a filling box (34) for accommodating and melting metal, and an annular sealed cavity covering the internal cavity of the filling box (34) is further provided in the side wall thereof, and a first heat-conducting layer (31), a first heating layer (32) and a first heat-insulating layer (33) are sequentially provided in the sealed cavity from the inside to the outside, wherein a first resistance wire (35) spirally wound around the axis of the filling box (34) is provided in the first heating layer (32), the first heat-conducting layer (31) is filled with crystalline magnesium oxide powder, and the first heat-insulating layer (33) is filled with glass fiber.

5. A method for connecting overhead power lines according to claim 4, characterized in that: The first heating layer (32) is connected to the first heat-conducting layer (31), and the first heat-insulating layer (33) covers both ends and the outer peripheral surface of the first heating layer (32).

6. A method for connecting overhead power lines according to claim 5, characterized in that: The bottom end of the filling box (34) is provided with a filling pipe (11) for outputting molten metal, the top of the peripheral surface of the connecting pipe (4) is provided with a liquid injection hole (41) for inserting the filling pipe (11), the top of the peripheral surface of the connecting pipe (4) is provided with a liquid discharge hole (42), and a valve (13) is provided on the filling pipe (11).

7. A method for connecting overhead power lines according to claim 6, characterized in that: The workbench (1) is supported by legs (8) evenly arranged at the bottom thereof. The legs (8) are retractable rods. Rollers (9) are rotatably arranged at the bottom ends of the legs (8). A slide groove (10) for accommodating the rollers (9) is provided on the top surface of the base (6).

8. The method for connecting overhead power lines according to claim 2, wherein: The heating assembly (5) comprises a lower heating plate (51) and an upper heating plate (52) with an arc-shaped cross section. A second resistance wire (59) is provided in each of the lower heating plate (51) and the upper heating plate (52). The lower heating plate (51) and the upper heating plate (52) are connected to the plates and the internal circuit simultaneously via a socket (54) and a plug (53) respectively provided on the mating surfaces.

9. A method for connecting overhead power lines according to claim 8, characterized in that: The lower heating plate (51) and the upper heating plate (52) are both provided with an arc-shaped sealed cavity, and a second heat-conducting layer (55), a second heating layer (56) and a second heat-insulating layer (57) are respectively provided inside the arc-shaped sealed cavity from the inside to the outside, and the two ends of the second heat-insulating layer (57) cover the two ends of the second heating layer (56).

10. The method for connecting overhead power lines according to claim 2, wherein: The connecting tube (4) comprises a tube body and sealing rubber rings (43) coaxially arranged at both ends of the tube body. A through hole for inserting the wire (15) is provided in the middle of the sealing rubber ring (43). The sealing rubber ring (43) is made of fluororubber.

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