Flow guide cable and feed steel pipe transition welding die, device and welding method

Abstract

The invention discloses a transition welding die, device and method for a diversion cable and a feed steel pipe, an adapter piece is arranged between the diversion cable and the feed steel pipe, and welding grooves are formed in the welding position of the adapter piece and the feed steel pipe and the welding position of the adapter piece and the diversion cable. The welding groove is communicated with the opening cavity formed in the welding mold to jointly form the cavity for forming the welding spot, so that the heated welding flux is cooled and formed in the cavity to form the welding spot which fully fills the welding groove and protrudes out of the surface of the adapter, and the shape of the welding spot is regular; the connection reliability of the current guide cable and the adapter and the connection reliability of the feed steel pipe and the adapter are improved, the quality of the welding spots is improved, and the welding efficiency of transition welding of the current guide cable and the feed steel pipe is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of grounding in a direct current transmission project, and in particular to a transition welding die, a device and a welding method for a current guide cable and a feeder steel pipe. Background Art

[0002] In the electrical installation of deep well vertical grounding electrodes for DC transmission projects, the connection between the guide cable and the feeder steel pipe is very important. The connection point is generally tens or hundreds of meters underground. Once a fault occurs, no remedial measures can be taken. With the promotion of deep well vertical grounding electrode technology, the connection process between the guide cable and the feeder steel pipe has received more and more attention. At present, an adapter is used for transition welding between the guide cable and the feeder steel pipe, but there is a lack of welding solutions to form reliable welds. Summary of the invention

[0003] The invention provides a transition welding die, device and welding method for a current guide cable and a feeder steel pipe, which are used to realize a welding scheme for forming reliable welding points.

[0004] A welding mold for transition welding of a guide cable and a feeder steel pipe provided in an embodiment of the present invention comprises an open cavity, a flow channel and a flux chamber. The open cavity is connected with the flux chamber through the flow channel. The open cavity is used to communicate with the welding groove of the workpiece to be welded to jointly form a cavity for forming a formed weld point.

[0005] Furthermore, the welding mold comprises a symmetrical main body 1 and a main body 2, and the main body 1 and the main body 2 are assembled to form the flux chamber, the flow channel and the open cavity in the welding mold.

[0006] Furthermore, the shape of the end surface of the opening cavity is matched with the surface shape of the workpiece to be welded, so as to enable the opening cavity to be closely connected with the welding groove.

[0007] Furthermore, the end surface of the opening cavity is provided with a step, the step is higher or lower than the opening cavity, and the step is used to abut against the top surface or bottom surface of the workpiece to be welded.

[0008] Furthermore, a first cable channel is provided on the upper side of the open cavity, and the first cable channel is used for inserting the end of the guide cable into the open cavity.

[0009] Further, the axis of the first cable channel is colinear with the axis of the open cavity, and the diameter of the first cable channel is smaller than the diameter of the open cavity.

[0010] A welding device for transition welding of a guide cable and a feeder steel pipe provided in an embodiment of the present invention comprises a welding mold as described in any one of the above items and a part to be welded, wherein the part to be welded comprises a transition piece, wherein the transition piece is arranged between the guide cable and the feeder steel pipe, and welding grooves are respectively arranged at the welding point between the transition piece and the feeder steel pipe and at the welding point between the transition piece and the guide cable, and the welding grooves are used to communicate with the opening of the welding mold to jointly form a cavity for forming a formed weld point.

[0011] Furthermore, the welding groove provided at the welding point between the adapter and the feeder steel pipe is a first welding groove, the adapter comprises a sleeve, the sleeve is used for interference fit with the feeder steel pipe, a welding opening is provided on the side wall of the sleeve, the welding opening is connected with the internal space of the sleeve, and the welding opening is used to form the first welding groove with the outer wall of the feeder steel pipe.

[0012] Furthermore, the welding groove provided at the welding point between the adapter and the guide cable is a second welding groove, a protrusion is provided on the outer wall of the ring, the second welding groove is opened on the side of the protrusion away from the ring, a second cable channel is opened on one side of the second welding groove, and the second cable channel is used for the end of the guide cable to be inserted into the second welding groove.

[0013] Further, the axis of the second cable channel is colinear with the axis of the second welding groove, and the diameter of the second cable channel is smaller than the diameter of the second welding groove.

[0014] An embodiment of the present invention provides a method for transition welding of a current guide cable and a feeder steel pipe using the above-mentioned welding device, comprising the following steps:

[0015] S01, abutting the end surface of the opening cavity of the welding mold against the surface of the adapter, so that the opening cavity and the welding groove are closely connected to form a cavity for forming a welding point;

[0016] S02. Add heated flux from the flux chamber of the welding mold, and the heated flux enters the cavity through the flow channel. After the flux in the cavity is cooled, a first welding point connecting the adapter and the feeder steel pipe or a second welding point connecting the adapter and the guide cable is formed.

[0017] It can be seen from the above technical solutions that the present invention has the following advantages:

[0018] The embodiment of the present invention sets welding grooves at the welding points between the adapter and the feeder steel pipe and at the welding points between the adapter and the guide cable. The welding grooves are connected to the opening cavity set in the welding mold to form a cavity for forming the weld point, which helps the heated flux to cool in the cavity and form a weld point that fully fills the welding groove and protrudes from the surface of the adapter. The weld point has a regular shape, which is beneficial to improving the reliability of the weld point connection and the quality of the weld point, and effectively improves the welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 A schematic diagram of a welding mold structure for welding a feeder steel pipe and a transition piece provided in an embodiment of the present invention;

[0021] Figure 2 A structural schematic diagram of a welding mold body for welding a feeder steel pipe and a transition piece provided in an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of a welding mold for welding a feeder steel pipe and a transition piece provided in an embodiment of the present invention. Figure 1 ;

[0023] Figure 4 A schematic diagram of a welding mold for welding a feeder steel pipe and a transition piece provided in an embodiment of the present invention. Figure 2 .

[0024] Figure 5 A schematic diagram of a welding mold structure for welding a current guide cable and an adapter provided in an embodiment of the present invention;

[0025] Figure 6 A structural schematic diagram of a welding mold body for welding a guide cable and an adapter provided by an embodiment of the present invention;

[0026] Figure 7 A schematic diagram of a welding mold for welding a guide cable and an adapter provided in an embodiment of the present invention. Figure 1 ;

[0027] Figure 8 A schematic diagram of a welding mold for welding a guide cable and an adapter provided in an embodiment of the present invention. Figure 2 ;

[0028] Fig. 9 A schematic diagram of the effect of connecting a guide cable and a feeder steel pipe after welding using a guide cable and a feeder steel pipe transition welding structure, a mold and a method provided by an embodiment of the present invention;

[0029] Fig.10 A schematic diagram of the structure of an adapter for transition welding between a guide cable and a feeder steel pipe provided in an embodiment of the present invention;

[0030] Fig.11 A schematic diagram of the welding groove structure of a transition piece for transition welding between a guide cable and a feeder steel pipe provided in an embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1. Guide cable; 11. Cable core; 2. Feeder steel pipe; 3. Adapter; 31. Ring; 311. Welding port; 32. Welding groove; 321. First welding groove; 322. Second welding groove; 323. Second cable channel; 33. Protrusion; 4. Second welding point; 5. First welding point; 6. Welding mold; 601. Main body one; 602. Main body two; 61. Flux chamber; 62. Flow channel; 63. Opening cavity; 64. End face; 65. Step; 66. First cable channel. DETAILED DESCRIPTION

[0033] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and drawings of the present invention are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the implementation of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] See also Figure 9-11 ,in Fig.10 An adapter 3 for transition welding between a guide cable 1 and a feeder steel pipe 2 is provided in an embodiment of the present invention. The adapter 3 is arranged between the guide cable 1 and the feeder steel pipe 2. Welding grooves 32 are respectively provided at the welding points between the adapter 3 and the feeder steel pipe 2 and at the welding points between the adapter 3 and the guide cable 1. The welding grooves 32 are used to communicate with the opening cavity 63 of the welding mold 6 to jointly form a cavity for forming a formed weld point.

[0036] It can be understood that, in a specific implementation, the welding groove 32 is arranged to communicate with the opening cavity 63 of the welding mold 6 to form a cavity for forming a welding point, thereby providing a place for forming a reliable welding point.

[0037] In a more specific embodiment, the adapter 3 is made of copper material to ensure that after the guide cable 1 is connected to the feeder steel pipe 2 through the adapter 3 , the current can be smoothly conducted from the guide cable 1 to the feeder steel pipe 2 through the adapter 3 .

[0038] In a more specific embodiment, the welding groove 32 provided at the welding point between the adapter 3 and the feeder steel pipe 2 is a first welding groove 321. The adapter 3 includes a collar 31, which is used to be sleeved with the feeder steel pipe 2 by interference fit. A welding opening 311 is provided on the side wall of the collar 31, and the welding opening 311 is connected to the internal space of the collar 31. The welding opening 311 is used to fit with part of the outer wall of the feeder steel pipe 2 to form a first welding groove 321.

[0039] It can be understood that, in specific implementation, the collar 31 is sleeved on the middle part of the feeder steel pipe 2, and the inner surface of the collar 31 contacts the circumferential outer wall of the feeder steel pipe 2, so that the contact area between the adapter 3 and the feeder steel pipe 2 is maximized, and the efficiency of the current guide cable 1 in transmitting current to the feeder steel pipe 2 is ensured. By opening a welding port 311 on the side wall of the collar 31, the welding port 311 is connected to the internal space of the collar 31, and after the collar 31 is sleeved on the feeder steel pipe 2, a part of the area on the side wall of the feeder steel pipe 2 can be exposed. In this way, when solder is filled into the welding port 311, the edge of the collar 31 at the welding port 311 can be welded to the side wall of the feeder steel pipe 2 around the edge, thereby further realizing the connection between the adapter 3 and the feeder steel pipe 2, and improving the connection strength between the adapter 3 and the feeder steel pipe 2.

[0040] See also Figure 1-Figure 4 The embodiment of the present invention provides a welding mold 6 for welding an adapter 3 and a feeder steel pipe 2, including: an open cavity 63, a flow channel 62 and a flux chamber 61. The open cavity 63 is connected to the flux chamber 61 through the flow channel 62. The open cavity 63 is used to communicate with the welding point between the feeder steel pipe 2 and the adapter 3 to form a cavity for forming a formed weld.

[0041] It can be understood that, in a specific implementation, a cavity for forming a formed weld point is formed by setting a welding groove 32 and communicating with the opening cavity 63 of the welding mold 6, thereby providing a place for forming a reliable first weld point 5. By adding heated flux to the welding mold 6, the heated flux enters the cavity through the flow channel 62, and the flux is cooled in the cavity to be formed into the first weld point 5.

[0042] See also Figure 1 In a more specific embodiment, the welding mold 6 includes a symmetrical body 1 601 and a body 2 602. The body 1 601 and the body 2 602 are assembled to form a flux chamber 61, a flow channel 62 and an open cavity 63 in the welding mold 6. It can be understood that in a specific implementation, by dividing the welding mold 6 into the symmetrical body 1 601 and the body 2 602, welding slag is not easy to clog the mold, and it is convenient to disassemble the mold after the welding point is formed.

[0043] In a more specific embodiment, the shape of the end face 64 of the opening cavity 63 of the welding mold 6 fits the surface shape of the adapter 3 so that the opening cavity 63 is closely connected with the welding groove 32. It can be understood that this embodiment is applied in the electrical installation of the deep well type vertical grounding electrode of the DC power transmission project. The welding head formed by the feeder steel pipe 2, the adapter 3 and the guide cable 1 is installed in the pipeline. The overall appearance of the welding head is arc-shaped, which is adapted to the arc-shaped structure of the inner wall of the pipeline. Therefore, the outer wall surfaces of the adapter 3 and the feeder steel pipe 2 of this embodiment are both arc-shaped structures. In specific implementation, the shape of the end face 64 of the opening cavity 63 of this embodiment fits the surface shape of the adapter 3, that is, the arc shape of the cavity opening and the end face 64 structure of the opening cavity 63 of this embodiment. Through the fit of the end face 64 and the surface shape of the adapter 3, the cavity opening of the opening cavity 63 is closely connected with the notch of the welding groove 32 to avoid leakage of flux due to misfit.

[0044] In a more specific embodiment, Figure 2 and Figure 3As shown, the outer side of the end face 64 is provided with a step 65 protruding from the end face 64, including a step 65 higher than the top end of the opening cavity 63 for abutting against the top of the adapter 3, and a step 65 lower than the bottom end of the opening cavity 63 for abutting against the bottom of the adapter 3. The abutting surfaces of the steps 65 are perpendicular to the end face 64. It can be understood that since the collar 31 of the adapter 3 is sleeved on the surface of the feeder steel pipe 2, the collar 31 has a certain thickness. In specific implementation, the top step 65 and the The bottom step 65 forms a slot, and the distance between the top and bottom steps 65 is greater than the upper and lower heights of the adapter 3. Therefore, the step 65 can limit the adapter 3 from being inserted into the slot, so that the surface of the adapter 3 fits with the end face 64 and the welding port 311 is quickly aligned and fit with the cavity mouth of the opening cavity 63; in the process of flux flowing into the cavity to form the weld, the bottom of the adapter 3 sleeve 31 keeps in contact with the step 65 at the outer bottom of the end face 64 of the opening cavity 63, thereby maintaining the stability of the adapter 3 and ensuring that the first weld 5 is stably formed in the cavity.

[0045] In a more specific embodiment, Figure 2 As shown, the welding mold 6 includes a symmetrical body 1 601 and a body 2 602 . After the body 1 601 and the body 2 602 are assembled, a flux chamber 61 , a flow channel 62 , an open cavity 63 and a slot are formed in the welding mold 6 . The slot is located on the outer side of the open cavity 63 .

[0046] In a more specific embodiment, Figure 4 As shown, the outlet of the flow channel 62 is arranged near the top of the cavity. It is understood that, in a specific implementation, injecting the flux from the top of the cavity can allow the flux to flow naturally to various parts of the cavity under the action of gravity, thereby ensuring that the entire cavity can be filled evenly, reducing the deformation of the weld point or local defects caused by uneven filling.

[0047] In a more specific embodiment, the height and width of the opening cavity 63 are both greater than the first welding groove 321 on the adapter 3. It can be understood that the flux can be ensured to fill the first welding groove 321, so that the flux is in full contact with the welding port 311 on the adapter 3 and the outer wall of the feed steel pipe 2, thereby ensuring the welding quality.

[0048] In a more specific embodiment, Figure 1 As shown, the cavity is an arc-shaped cavity. It can be understood that, on the one hand, the formed weld can be fully fitted with the arc-shaped outer wall of the feed steel pipe 2, and the thickness of the weld is uniform; on the other hand, the welding head formed by the feed steel pipe 2, the connecting piece and the guide cable 1 is installed in the pipeline, and the overall appearance of the welding head is arc-shaped. This embodiment makes the formed weld adapt to the arc-shaped structure of the inner wall of the pipeline, avoiding the wear of the weld due to shape incompatibility when the welding head is placed in the pipeline.

[0049] See also Fig. 9 , the embodiment of the present invention provides a first welding spot 5 formed by a first welding groove 321 and an opening cavity 63, and the first welding spot 5 is filled into the first welding groove 321. In this embodiment, the welding port 311 and the outer wall of the feeder steel pipe 2 exposed at the welding port 311 form the first welding groove 321. By filling the first welding groove 321 with flux, on the one hand, the flux and the welding port 311 of the adapter 3 are fully connected with the side wall of the feeder steel pipe 2, so that the connection between the adapter 3 and the feeder steel pipe 2 is more firm, and the loosening or falling off between the adapter 3 and the steel pipe is prevented, thereby improving the reliability of welding; on the other hand, a good conductive connection is achieved. When the flux and the welding port 311 of the adapter 3 are fully connected with the side wall of the feeder steel pipe 2, a low-resistance conductive path can be provided to ensure that the current is efficiently transmitted from the adapter 3 to the feeder steel pipe 2.

[0050] In a more specific embodiment, the first weld 5 formed by the first weld groove 321 and the opening cavity 63 of the welding mold 6 has a weld thickness greater than the thickness of the collar 31 of the adapter 3, a portion of the first weld 5 is filled in the first weld groove 321, and this portion is constrained and formed by the first weld groove 321, and another portion of the first weld 5 protrudes from the surface of the adapter 3 and is exposed on the surface of the adapter 3, and this portion is constrained and formed by the opening cavity 63 of the welding mold 6. Since the contact area between the first weld 5 and the feeder steel pipe 2 is larger than the contact area between the first weld 5 and the adapter 3, the connection between the first weld 5 and the feeder steel pipe 2 is more stable, and the thickness of the first weld 5 is greater than that of the adapter 3 and protrudes from the outer surface of the adapter 3, so the first weld 5 not only has a connecting function for the adapter 3, but also has a further supporting function for the adapter 3, which is conducive to improving the connection reliability between the first weld 5 and the adapter 3.

[0051] In a more specific embodiment, the first welding point 5 is in the shape of an arc block, which can fully fit with the arcuate outer wall of the feed steel pipe 2 on the one hand, thereby improving the connection reliability between the first welding point 5 and the outer wall of the feed steel pipe 2; on the other hand, the welding head formed by the feed steel pipe 2, the adapter 3 and the guide cable 1 is installed in the pipeline, and the overall appearance of the welding head is arc-shaped, which is adapted to the arc-shaped structure of the inner wall of the pipeline. Therefore, the first welding point 5 of this embodiment is in the shape of an arc block, which is also adapted to the arc-shaped structure of the inner wall of the pipeline, thereby avoiding wear of the welding point due to shape incompatibility when the welding head is placed in the pipeline.

[0052] In a more specific embodiment, the first weld 5 has a flat surface and uniform thickness. The uniform weld can make the mechanical strength of the weld more evenly distributed throughout the first weld groove 321. At the same time, it can avoid the uneven current distribution caused by the different contact areas between the adapter 3 and the feeder steel pipe 2 and the weld due to uneven welds, thereby avoiding the occurrence of resistance differences. This is beneficial to improving the current transfer performance of the weld.

[0053] Therefore, this embodiment can form a weld point connecting the adapter 3 and the feeder steel pipe 2 in the first welding groove 321 that is reliable in terms of current transfer performance and structural strength.

[0054] The embodiment of the present invention provides a method for welding a feeder steel pipe 2 and a transition piece 3, comprising the following steps:

[0055] S01, abutting the end surface 64 of the opening cavity 63 of the welding mold 6 against the surface of the adapter 3, so that the opening cavity 63 and the welding groove 32 are closely connected to form a cavity for forming a welding point;

[0056] S02, adding heated flux from the welding mold 6, the heated flux enters the cavity through the flow channel 62, and after the flux in the cavity is cooled, a uniform first welding point 5 is formed that fills the welding groove 32 and has a thickness greater than the adapter 3.

[0057] Step S01 also includes:

[0058] Prepare exothermic flux, welding mold 6, ignition device, safety protection equipment, parts to be welded, etc. The parts to be welded include feeder steel pipe 2 and adapter 3. Ensure that the welding surface of the parts to be welded and the welding mold is clean without oil stain, rust or impurities.

[0059] Step S02 also includes:

[0060] S21. Fill the flux chamber in the welding mold with an appropriate amount of exothermic flux. Gently compact the flux to ensure that there are no air bubbles and gaps.

[0061] S22. Place an ignition device above the flux, use the ignition device to ignite the flux, and start an exothermic reaction.

[0062] S23, the first welding point 5 is naturally cooled and solidified at room temperature. After being completely cooled, the welding mold 6 is disassembled, the main body 1 601 and the main body 2 602 of the welding mold 6 are separated, and the welding mold 6 is fixed at the welding position to ensure that the welding mold 6 is aligned with the adapter 3.

[0063] It can be understood that, in a specific implementation, the welding method of this embodiment cools and forms the heated flux in the mold cavity into a first weld 5 that fully fills the welding groove 32 and protrudes from the surface of the adapter 3, and the first weld 5 has a regular shape, which is beneficial to improving the reliability of the first weld 5 connecting the adapter 3 and the feeder steel pipe 2 and the quality of the first weld 5, and significantly improves the welding efficiency.

[0064] See also Figure 9-11 , Fig.10An adapter 3 for transition welding between a guide cable 1 and a feeder steel pipe 2 is provided in an embodiment of the present invention. In a more specific embodiment, a welding groove 32 provided at the welding point between the adapter 3 and the guide cable 1 is a second welding groove 322. A protrusion 33 is provided on the outer wall of the ring 31. The protrusion 33 is used for welding with the guide cable 1. The second welding groove 322 is opened on the side of the protrusion 33 away from the ring 31. A second cable channel 323 is opened on one side of the second welding groove 322. The second cable channel 323 is used to provide an insertion port for the end of the guide cable 1 to be inserted into the second welding groove 322.

[0065] It can be understood that, in a specific implementation, a second weld point 4 is formed through the second weld groove 322 and the opening cavity 63 of the welding mold 6, so that a reliable weld point is formed in the second weld groove 322 to connect the adapter 3 and the guide cable 1; the second cable channel 323 enables the cable end to be inserted into the second weld groove 322 so that the end of the guide cable 1 is in contact with the flux.

[0066] In a more specific embodiment, the axis of the second cable channel 323 is parallel to the axis of the collar 31, so as to realize the parallel connection between the guide cable 1 and the feeder steel pipe 2. It is understandable that, in specific implementation, the axis of the second cable channel 323 is parallel to the axis of the collar 31, so as to realize the parallel welding between the guide cable 1 and the feeder steel pipe 2, avoid cable bending, and adapt to the limited space underground.

[0067] In a more specific embodiment, the axis of the second cable channel 323 is colinear with the axis of the second welding groove 322, and the diameter of the second cable channel 323 is smaller than the diameter of the second welding groove 322. It can be understood that, in a specific implementation, the axis of the second cable channel 323 coincides with the second welding groove 322, and the diameter is smaller than the second welding groove 322, so that the guide cable 1 core is inserted into the opening 63 and fixed in the middle of the second welding groove 322, so that the flux evenly wraps the cable core 11.

[0068] In a more specific embodiment, the second cable channel 323 is disposed above the second welding groove 322 to facilitate the arrangement of the current cable above the adapter 3 .

[0069] In a more specific embodiment, the cable core 11 at the end of the guide cable 1 is inserted into the second welding groove 322 through the second cable channel 323 .

[0070] In a more specific embodiment, the second welding groove 322 is a semi-cylindrical groove.

[0071] In a more specific embodiment, the second cable channel 323 is a semicircular hole.

[0072] In a more specific embodiment, the second welding groove 322 is connected to the second cable channel 323, the second welding groove 322 and the second cable channel 323 are coaxially arranged, the diameter of the second cable channel 323 is smaller than the diameter of the second welding groove 322, and the inner diameter of the second cable channel 323 is slightly larger than the outer diameter of the cable core 11. It can be understood that in a specific implementation, when the cable core 11 is inserted from the second cable channel 323 to the second welding groove 322, under the limiting effect that the diameter of the second cable channel 323 is smaller than the diameter of the second welding groove 322, the position of the cable core 11 is achieved in the middle of the second welding groove 322, and when the flux is injected, the gap between the cable core 11 and the second welding groove 322 is filled, so that the flux evenly wraps the cable core 11.

[0073] In a more specific embodiment, the outer wall of the protrusion 33 is arc-shaped, which is adapted to the arc-shaped structure of the inner wall of the installation pipe.

[0074] See also Figure 5-8 The embodiment of the present invention provides a welding mold 6 for realizing welding between the adapter 3 and the guide cable 1, comprising: an open cavity 63, a flow channel 62 and a flux chamber 61, wherein the open cavity 63 is connected with the flux chamber 61 through the flow channel 62, and the open cavity 63 is used to communicate with the welding point between the guide cable 1 and the adapter 3 or the welding point between the feed steel pipe 2 and the adapter 3 to jointly form a cavity for forming a formed weld point.

[0075] It can be understood that, in a specific implementation, the welding groove 32 is arranged to communicate with the opening cavity 63 of the welding mold 6 to form a cavity for forming a welding point, thereby providing a place for forming a reliable welding point.

[0076] In a more specific embodiment, the welding mold 6 includes a symmetrical body 1 601 and a body 2 602, which are assembled to form a flux chamber 61, a flow channel 62 and an open cavity 63 in the welding mold 6. It can be understood that, in a specific implementation, by dividing the welding mold 6 into the symmetrical body 1 601 and the body 2 602, welding slag is not easy to clog the mold, and it is convenient to disassemble the mold after the welding point is formed.

[0077] In a more specific embodiment, the end face 64 of the opening cavity 63 is in conformity with the surface shape of the adapter 3 so that the opening cavity 63 is closely connected with the welding groove 32. It is understandable that, in the specific implementation, the end face 64 of the opening cavity 63 of this embodiment is in conformity with the outer wall of the protrusion 33 of the adapter 3 so that the opening cavity 63 is closely fitted with the second welding groove 32 to avoid leakage of flux due to misfit. To adapt to the installation of the pipeline, the outer wall of the protrusion 33 is arc-shaped, therefore, the end face 64 of the opening cavity 63 of this embodiment is also arc-shaped.

[0078] In a more specific embodiment, Figure 5As shown, a step 65 protruding from the end face 64 is provided on the outer side of the end face 64 of the opening cavity 63, and the step 65 is lower than the opening cavity 63. The step 65 is used to abut against the bottom of the protrusion 33, and the abutting surface of the step 65 is perpendicular to the end face 64. It can be understood that in a specific implementation, the step 65 abuts against the bottom surface of the protrusion 33, which is used to position the welding mold 6 at the protrusion 33 of the adapter 3, thereby improving the alignment efficiency between the opening cavity 63 and the second welding groove 32. The bottom of the protrusion 33 of the adapter 3 is kept in contact with the step 65 at the outer bottom of the end face 64 of the opening cavity 63, maintaining the stable state of the adapter 3 and ensuring that the second welding point 4 is stably formed in the cavity.

[0079] In a more specific embodiment, a first cable channel 66 is provided on the upper side of the opening cavity 63, and the first cable channel 66 is used to provide an insertion port for the end of the guide cable 1 to be inserted into the opening cavity 63. It is understandable that, in a specific implementation, the cable channel enables the end of the guide cable 1 to be inserted into the opening cavity 63 so that the cable core 11 at the end of the guide cable 1 contacts the flux, thereby achieving welding of the guide cable 1 and the adapter 3. By providing the first cable channel 66 on the upper side of the opening cavity 63, the flux will not leak out under the action of gravity.

[0080] In a more specific embodiment, the first cable channel 66 is a semicircular hole, and the first cable channel 66 of the welding mold 6 is combined with the second cable channel 323 of the adapter 3 to form a connected circular hole for inserting the cable core 11 into the cavity; the opening cavity 63 is a semi-cylindrical groove, and the opening cavity 63 of the welding mold 6 and the second welding cavity of the adapter 3 form a cylindrical cavity, the diameter of the circular hole is smaller than the diameter of the cylindrical cavity, and the axis of the circular hole is colinear with the axis of the cylindrical cavity, which is used to form a cylindrical weld point and evenly wrap the cable core 11.

[0081] In a more specific embodiment, Figure 6 As shown, the outlet of the flow channel 62 is arranged near the top of the cavity. It is understood that, in a specific implementation, injecting the flux from the top of the cavity can allow the flux to flow naturally to various parts of the cavity under the action of gravity, thereby ensuring that the entire cavity can be filled evenly, reducing the deformation of the weld point or local defects caused by uneven filling.

[0082] In a more specific embodiment, the height and width of the opening cavity 63 are both greater than the second welding groove 322 on the adapter 3. It can be understood that this can ensure that the flux can fully fill the second welding groove 322, so that the flux is in full contact with the inner wall of the second welding groove on the adapter 3, thereby ensuring the welding quality.

[0083] In a more specific embodiment, Figure 5As shown, the welding mold 6 includes a symmetrical body 1 601 and a body 2 602 . After the body 1 601 and the body 2 602 are assembled, a flux chamber 61 , a flow channel 62 , an opening 63 and a step 65 are formed in the welding mold 6 . The step 65 is located outside the opening 63 .

[0084] An embodiment of the present invention provides a second weld point 4 formed by a second weld groove 322 and an opening cavity 63. The second weld point 4 is a regular cylindrical shape. Part of the second weld point 4 is formed in the second weld groove through the second welding groove 32. Part of the second weld point 4 is formed outside the protrusion 33 through the opening cavity 63 of the welding mold 6, protruding from the outer wall of the adapter protrusion 33. The middle part of the second weld point 4 is hollow for setting the cable core 11. The end and periphery of the cable core 11 are wrapped with flux, which is beneficial to improving the reliability of the weld connecting the guide cable 1 and the adapter 3, and improving the quality of the weld.

[0085] In a more specific embodiment, the wall thickness of the cylindrical weld is uniform. It can be understood that the uniform wall thickness can make the mechanical strength of the weld be more evenly distributed between the entire second weld groove 322 and the cable core 11. At the same time, it can avoid the uneven current distribution caused by the different contact areas between the second weld groove 322 of the adapter 3 and the cable core 11 and the weld due to uneven welds, thereby avoiding the occurrence of uneven current distribution due to resistance differences. This is beneficial to improving the current transfer performance of the weld.

[0086] Therefore, this embodiment can form a welding point in the second welding groove 322 that is reliable in terms of current transmission performance and structural strength to connect the adapter 3 and the guide cable.

[0087] A method for welding a current guiding cable 1 and a connecting piece 3 provided in an embodiment of the present invention comprises the following steps:

[0088] S01, abutting the end surface 64 of the opening cavity 63 of the welding mold 6 against the surface of the adapter 3, so that the opening cavity 63 and the welding groove 32 are closely connected to form a cavity for forming a welding point;

[0089] S02. Insert the cable core 11 at the end of the guide cable 1 into the cavity through the cable channel formed by combining the first cable channel 66 and the second cable channel 323.

[0090] S03, adding heated flux from the flux chamber 61 of the welding mold 6, the heated flux enters the cavity through the flow channel 62, and after the flux in the cavity is cooled, a second welding point 4 connecting the adapter 3 and the guide cable 1 is formed.

[0091] Step S01 also includes:

[0092] Prepare exothermic flux, welding mold 6, ignition device, safety protection equipment, parts to be welded, etc. The parts to be welded include guide cable 1 and adapter 3. Ensure that the welding surfaces of the parts to be welded and welding mold 6 are clean, free of oil, rust or impurities; fix welding mold 6 in the welding position, and ensure that welding mold 6 is aligned with adapter 3.

[0093] Step S03 also includes:

[0094] S31. Fill an appropriate amount of exothermic flux into the flux chamber of the welding mold 6. Gently compact the flux to ensure that there are no air bubbles and gaps.

[0095] S32. Place an ignition device above the flux, use the ignition device to ignite the flux, and start an exothermic reaction.

[0096] S33, the second welding spot 4 is naturally cooled and solidified at room temperature. After being completely cooled, the welding mold 6 is disassembled, and the main body 1 601 and the main body 2 602 of the welding mold are separated.

[0097] It can be understood that, in a specific implementation, the welding method of this embodiment cools and molds the heated flux in the mold cavity into a second weld point 4 that fully fills the welding groove 32 and protrudes from the surface of the adapter 3, and the second weld point 4 has a regular shape, which is beneficial to improving the reliability of the second weld point 4 connecting the adapter 3 and the guide cable 1 and the quality of the second weld point 4, and significantly improves the welding efficiency.

[0098] In a more specific embodiment, the welding mold 6 uses first-level three-impregnated four-cultivated graphite with high strength, high purity, high density and good wear resistance as the basic raw material, and is manufactured through CNC processing.

[0099] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A welding die for transition welding of a guide cable and a feeder steel pipe, characterized in that: The invention comprises an open cavity (63), a flow channel (62) and a flux chamber (61); the open cavity (63) is connected to the flux chamber (61) through the flow channel (62); the open cavity (63) is used to be connected to a welding groove (32) of a workpiece to be welded to form a cavity for forming a weld point.

2. A welding die for transition welding of a guide cable and a feeder steel pipe according to claim 1, characterized in that: The welding mold (6) comprises a symmetrical main body (601) and a symmetrical main body (602). The main body (601) and the main body (602) are assembled to form the flux chamber (61), the flow channel (62) and the open cavity (63) in the welding mold (6).

3. A welding die for transition welding of a guide cable and a feeder steel pipe according to claim 1, characterized in that: The shape of the end surface (64) of the open cavity (63) matches the surface shape of the workpiece to be welded, so as to enable the open cavity (63) to be tightly connected with the welding groove (32).

4. A welding die for transition welding of a guide cable and a feeder steel pipe according to claim 3, characterized in that: The end surface (64) of the opening cavity (63) is provided with a step (65), the step (65) is higher or lower than the opening cavity (63), and the step (65) is used to abut against the top surface or bottom surface of the part to be welded.

5. A welding die for transition welding of a guide cable and a feeder steel pipe according to claim 1, characterized in that: A first cable channel (66) is provided on the upper side of the open cavity (63), and the first cable channel (66) is used for inserting the end of the guide cable (1) into the open cavity (63).

6. A welding die for transition welding of a guide cable and a feeder steel pipe according to claim 5, characterized in that: The axis of the first cable channel (66) is colinear with the axis of the open cavity (63), and the diameter of the first cable channel (66) is smaller than the diameter of the open cavity (63).

7. A welding device for transition welding of a guide cable and a feeder steel pipe, characterized in that: It comprises a part to be welded and a welding mold according to any one of claims 1 to 6, wherein the part to be welded comprises an adapter (3), the adapter (3) is arranged between the guide cable (1) and the feeder steel pipe (2), and welding grooves (32) are respectively provided at the welding point between the adapter (3) and the feeder steel pipe (2) and the welding point between the adapter (3) and the guide cable (1), and the welding groove (32) is used to communicate with the opening (63) of the welding mold (6) to jointly form a cavity for forming a formed weld point.

8. A welding device for transition welding of a guide cable and a feeder steel pipe according to claim 7, characterized in that: The welding groove (32) provided at the welding point between the adapter (3) and the feeder steel pipe (2) is a first welding groove (321); the adapter (3) comprises a sleeve ring (31); the sleeve ring (31) is used for interference fit sleeve connection with the feeder steel pipe (2); a welding opening (311) is provided on the side wall of the sleeve ring (31); the welding opening (311) is communicated with the internal space of the sleeve ring (31); the welding opening (311) is used for forming the first welding groove (321) with the outer wall of the feeder steel pipe (2).

9. A welding device for transition welding of a guide cable and a feeder steel pipe according to claim 8, characterized in that: The welding groove (32) provided at the welding point between the adapter (3) and the guide cable (1) is a second welding groove (322); a convex part (33) is provided on the outer wall of the ring (31); the second welding groove (322) is opened on a side of the convex part (33) away from the ring (31); a second cable channel (323) is opened on one side of the second welding groove (322); the second cable channel (323) is used for inserting the end of the guide cable (1) into the second welding groove (322).

10. A welding device for transition welding of a guide cable and a feeder steel pipe according to claim 9, characterized in that: The axis of the second cable channel (323) is colinear with the axis of the second welding groove (322), and the diameter of the second cable channel (323) is smaller than the diameter of the second welding groove (322).

11. A method for transition welding of a current guide cable and a feeder steel pipe using the welding device according to any one of claims 7 to 10, characterized in that: The following steps are involved: S01, bringing the end surface (64) of the opening cavity (63) of the welding mold (6) into contact with the surface of the adapter (3), so that the opening cavity (63) and the welding groove (32) are closely connected to form a cavity for forming a welding point; S02. Heated flux is added from the flux chamber of the welding mold (6), and the heated flux enters the mold cavity through the flow channel (62). After the flux in the mold cavity cools, a first welding point (5) connecting the adapter (3) and the feeder steel pipe (2) or a second welding point (4) connecting the adapter (3) and the guide cable (1) is formed.

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