Quick copper nose welding device for pipes

Abstract

The present invention is applicable to the technical field of buried pipeline welding, and provides a fast copper nose welding device for pipelines, including a welding gun, a welding nail and a pre-positioning assembly sleeved on the welding gun, a ceramic ring sleeved on the welding nail and a copper nose, the welding gun includes a welding gun seat, a welding gun head installed on the welding gun seat and a clamp, the pre-positioning assembly includes a snap ring sleeved on the welding gun head and a symmetrically arranged positioning mechanism, the positioning mechanism includes an adjustment part, a telescopic part and a positioning arc plate connected in sequence. The device solves the problems that the copper nose and the buried pipeline are not easy to weld, deformation is easy to occur after welding, and displacement is easy to occur between the welding nail and the buried pipeline, and achieves the use of pre-positioning to avoid displacement of the welding nail during welding, quickly complete the welding of the copper nose and the buried pipeline, and avoid the problem of monitoring accuracy of the cathodic protection system due to welding deformation.

Description

Technical Field

[0001] The invention relates to the technical field of buried pipeline welding, and more particularly to a fast copper nose welding device for pipelines. Background Art

[0002] The terrain of the buried steel pipeline installation route is complex, and the substances in the soil are corrosive to the steel pipeline. In order to prevent pipeline corrosion, it is not only necessary to use a coating on the outer surface of the pipeline for protection, but also to use an external current to force cathodic protection (buried steel pipeline cathodic protection technology), thereby forming a double-layer protection system outside the pipeline to minimize the possibility of corrosion.

[0003] The buried pipeline cathodic protection project includes two parts: the cathodic protection station and the test pile. A major step in the construction of the test pile is to connect the test cable to the steel pipeline. When connecting, the test cable head needs to be crimped onto the copper nose, and then the copper nose is welded to the steel pipeline. The welding effect of the copper nose and the steel pipeline will directly affect the safety and effectiveness of the connection between the test cable and the steel pipe, which will further affect the accuracy of monitoring and control after the cathodic protection system is put into operation.

[0004] Most existing buried pipeline welding devices use a welding gun to melt the welding wire and evenly coat it on the outside of the copper nose, and use the solidified welding liquid to achieve the connection between the copper nose and the steel pipe. In the process of welding the copper nose and the steel pipe, since the thermal conductivity of copper is much higher than that of iron, the copper nose will conduct heat faster, resulting in a temperature difference between the copper nose and the steel pipe during welding, making it difficult to heat evenly, and easily causing the problem of uneven fusion of the welding liquid; on the other hand, the linear expansion coefficient and contraction rate of copper are larger than those of iron, which will cause the copper nose to expand and contract more obviously, and it is easy to produce large deformation after welding. Uneven fusion of welding liquid and deformation of the copper nose will cause the welding point between the copper nose and the steel pipe to be unreliable, and the cable will easily loosen during the subsequent monitoring process, affecting the monitoring accuracy. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a buried pipeline welding device which utilizes pre-positioning to avoid displacement of welding pins during welding, quickly completes the welding of the copper nose and the buried pipeline, and avoids the monitoring accuracy of the cathodic protection system due to welding deformation.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A quick copper nose welding device for a pipeline comprises a welding gun, a welding stud and a pre-positioning assembly mounted on the welding gun, a ceramic ring and a copper nose mounted on the welding stud. The welding gun comprises a welding gun seat, a welding gun head mounted on the welding gun seat, and a clamp. The pre-positioning assembly comprises a snap ring mounted on the welding gun head and a symmetrically arranged positioning mechanism. The positioning mechanism comprises an adjusting part, a telescopic part, and a positioning arc plate connected in sequence.

[0008] The present invention is further configured as follows: the snap ring is configured as a hollow cylindrical structure, the snap ring is provided with a snap groove whose shape matches the shape of the welding gun head, a connecting plate is installed at the bottom of the snap ring, and a mounting hole is provided on the connecting plate.

[0009] The present invention is further configured as follows: the two positioning mechanisms are installed at the bottom of the connecting plate, each of the adjusting parts includes a top plate and a screw rod installed on the top plate, an adjusting block is sleeved on the outer wall of the screw rod, and the internal shape of the adjusting block is meshed with the positioning arc plate.

[0010] The present invention is further configured as follows: the telescopic part includes an upper connecting rod and a lower connecting rod which are slidably connected, the upper connecting rod has an inner cavity, a telescopic spring is installed in the inner cavity, the lower connecting rod is inserted in the inner cavity, and the top is connected to the telescopic spring.

[0011] The present invention is further configured as follows: the two positioning arc plates are configured as symmetrically arranged semi-circular arc structures, each positioning arc plate is provided with a fitting portion at the bottom, the bottom of the positioning arc plate can abut against the buried pipeline, and the fitting portion is configured as an arc-shaped structure that fits with the side wall of the buried pipeline.

[0012] By adopting the above technical solution, during the process of continuous pressure applied by the welding gun, the positioning arc plate is subjected to the reverse force of the buried pipeline, so that the lower connecting rod is synchronously stressed to compress the telescopic spring, and the positioning arc plate can always keep in contact with the side wall of the buried pipeline during the entire welding process through the sliding between the lower connecting rod and the upper connecting rod. Thus, the purpose of pre-positioning by using the positioning arc plate is achieved, and the friction between the positioning arc plate and the side wall of the buried pipeline is used to ensure that the welding nail will not be displaced from the side wall of the buried pipeline after being stressed.

[0013] The present invention is further configured as follows: the welding gun head is configured as a cylindrical structure, one end of the welding gun head is inserted into the welding gun seat, and a clamp is installed in the other end.

[0014] The present invention is further configured as follows: the clamp is configured as a conical structure, a clamping opening is provided on a side of the clamp away from the welding gun head, and the shape of the clamping opening is adapted to the shape of the welding nail.

[0015] The present invention is further configured as follows: the welding stud comprises a main body portion and a joint portion arranged at one end of the main body portion, and a fitting portion is arranged around the middle of the main body portion.

[0016] The present invention is further configured as follows: the ceramic ring is configured as a circular ring structure, a fitting ring is provided inside the ceramic ring, the shape of the fitting ring is adapted to the shape of the fitting portion, and a contact portion with a serrated structure is provided on the inner side of the bottom of the ceramic ring.

[0017] The present invention is further configured as follows: a welding port is provided on the copper nose, the shape of the welding port is adapted to the shape of the welding nail, a connecting cable is provided on the copper nose away from the welding port, and a connecting portion is provided between the welding port and the connecting cable for connection.

[0018] By adopting the above technical solution, the ceramic ring is sleeved on the welding nail, so that the embedding part on the welding nail and the embedding ring on the ceramic ring are well embedded. Then the copper nose is laid flat, and the welding nail is inserted into the welding port on the copper nose, and welding can be carried out.

[0019] The beneficial effects of the present invention are:

[0020] When welding the copper nose and the buried pipeline, on the one hand, the welding is quickly achieved through the uniform melting of the joint part on the welding nail, avoiding the uneven heat conduction caused by the copper nose's excessive heat conduction, ensuring that the welding point is firm and there will be no false connection; on the other hand, the ceramic ring is used for heat insulation during the welding process to reduce the temperature rise around the welding point at the moment of welding, so that the alloy material is always welded at a low temperature throughout the welding process, and the heat-affected zone of the welding point is small, which can not only effectively avoid the damage to the metallographic structure of the buried pipeline, but also reduce the probability of deformation of the copper nose after welding. In this way, the reliability of the welding of the copper nose and the buried pipeline is guaranteed, and the accuracy of the monitoring and control of the cathodic protection system after commissioning is avoided due to the loose connection cable in the subsequent process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 The figure is a schematic structural diagram of a rapid copper nose welding device for pipelines according to the present invention.

[0023] Figure 2 for Figure 1 The welding diagram of the quick copper nose welding device for pipes is shown.

[0024] Figure 3 for Figure 1 Schematic diagram of the exploded structure of the rapid copper nose welding device for pipelines.

[0025] Figure 4 for Figure 2 A partial enlarged view of area A is shown.

[0026] Figure 5 for Figure 4A cross-sectional view of the welding stud, ceramic ring and copper nose shown.

[0027] Figure 6 for Figure 2 Schematic diagram of the structure of the copper nose shown.

[0028] Figure 7 for Figure 3 Schematic diagram of the structure of the ceramic ring shown.

[0029] Figure 8 It is a schematic diagram of the structure of the buried pipeline welding device in the second embodiment of the present invention.

[0030] Fig. 9 for Figure 8 The figure shows a welding schematic diagram of a quick copper nose welding device for a pipeline in the second embodiment of the present invention.

[0031] Fig.10 for Figure 8 The diagram shows an exploded structure of a quick copper nose welding device for a pipeline in the second embodiment of the present invention.

[0032] Fig.11 for Fig.10 A schematic diagram of the structure of the pre-positioning component shown.

[0033] Fig.12 for Fig.11 Schematic diagram of the exploded structure of the pre-positioning component shown.

[0034] Fig.13 for Fig.12 Front view of the adjustment and positioning mechanism shown.

[0035] Fig.14 for Fig.13 Schematic diagram of the structure of the regulating part shown.

[0036] Fig.15 for Fig.13 A cross-sectional view of the telescopic portion shown.

[0037] Fig.16 for Fig. 9 A partial enlarged view of area B is shown.

[0038] Fig.17 for Fig. 9 A partial enlarged view of area B from another perspective.

[0039] Fig.18 It is a structural schematic diagram of the manual adjustment part in the third embodiment of the present invention.

[0040] Fig.19 for Fig.18 Schematic diagram of the exploded structure of the manual adjustment part shown.

[0041] Description of the accompanying drawings: 1. buried pipeline;

[0042] 2. Copper nose; 21. Welding port; 22. Connecting part;

[0043] 3. welding gun; 31. welding gun seat; 32. welding gun head; 33. clamp; 34. clamping mouth;

[0044] 4. welding nail; 41. main body; 42. fitting part; 43. joint part;

[0045] 5. Ceramic ring; 51. Fitting ring; 52. Abutment portion;

[0046] 6. Pre-positioning assembly; 61. Buckle ring; 611. Buckle groove; 62. Connecting plate; 621. Mounting hole; 622. Protrusion; 63. Positioning mechanism; 631. Adjusting part; 6311. Top plate; 6312. Driving member; 6313. Screw rod; 6314. Adjusting block; 632. Telescopic part; 6321. Upper connecting rod; 6322. Inner cavity; 6323. Telescopic spring; 6324. Lower connecting rod; 633. Positioning arc plate; 6331. Fitting part;

[0047] 634, manual adjustment part; 6341, mounting frame; 6342, slide rail; 6343, slide bar; 6344, limit part; 6345, buckle; 63451, first buckle block; 63452, second buckle block; 63453, buckle clip; 63454, buckle groove;

[0048] 7. Connect the cables. DETAILED DESCRIPTION

[0049] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is now described in detail in conjunction with the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basics of the present invention in an illustrative manner, so it only shows the composition related to the present invention. Obviously, the described embodiments are 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 making creative work are within the scope of protection of the present invention.

[0050] Example 1, please refer to Figure 1-7, a fast copper nose welding device for pipelines, comprising a welding gun 3, a welding nail 4 sleeved on the welding gun 3, a ceramic ring 5 sleeved on the welding nail 4 and a copper nose 2. The buried pipeline welding device can be used to weld the copper nose 2 to the buried pipeline 1 to achieve the connection between the buried pipeline 1 and the connecting cable 7. Multiple copper noses 2 can be continuously welded on the buried pipeline 1 to achieve the connection between the test cable and the buried pipeline 1. During welding, the welding nail 4 is first inserted into the welding gun 3, and then the ceramic ring 5 is sleeved on the welding nail 4. Finally, the welding nail 4 passes through the copper nose 2, so that the welding nail 4 contacts the buried pipeline 1, and the welding is completed.

[0051] Please refer to Figure 1-3 , the welding gun 3 includes a welding gun seat 31, a welding gun head 32 mounted on the welding gun seat 31, and a clamp 33. It should be noted that the welding gun seat 31 in the present application can be connected to a power control unit (not shown in the figure), a combined welding and grounding cable with a clamp (not shown in the figure), etc., to achieve the control and operation of welding. The welding gun head 32 is set as a cylindrical structure, one end of the welding gun head 32 is plugged into the welding gun seat 31, and the clamp 33 is installed at the other end of the welding gun head 32. The clamp 33 is set as a conical structure, and the bottom of the clamp 33 is composed of a plurality of clips arranged around. A clamping opening 34 is opened on the side of the clamp 33 away from the welding gun head 32, and the shape of the clamping opening 34 is adapted to the shape of the welding nail 4. Before welding, the welding nail 4 needs to be plugged into the welding gun head 32 through the clamping opening 34.

[0052] Please refer to Figure 3-5 The welding nail 4 is configured as a cylindrical structure as a whole. The welding nail 4 includes a main body 41 and a joint part 43 arranged at one end of the main body 41. A fitting part 42 is arranged around the middle of the main body 41, and the diameter of the fitting part 42 is smaller than the diameter of the main body 41. It should be noted that the main body 41 and the fitting part 42 on the welding nail 4 are made of high-purity brass, and the outer shell of the joint part 43 is made of a special alloy, and a special chemical powder is filled inside. The alloy material of the joint part 43 can be selected from alloy materials such as carbon steel, stainless steel, aluminum alloy, copper alloy and nickel alloy, and the special chemical powder can be chemical powders such as flux, deoxidizer, alloying agent and adhesive. The welding can be quickly achieved by uniformly melting the joint part 43 on the welding nail 4, avoiding the uneven heat conduction caused by the excessive heat conduction of the copper nose 2, ensuring that the soldering point is firm and no false connection will occur.

[0053] Please refer to Figure 4-5 and Figure 7The ceramic ring 5 is set as a circular ring structure, and a fitting ring 51 is provided inside the ceramic ring 5. The shape of the fitting ring 51 matches the shape of the fitting part 42. When the ceramic ring 5 is sleeved on the welding nail 4, the fitting part 42 on the welding nail 4 and the fitting ring 51 on the ceramic ring 5 fit together. A serrated abutment part 52 is provided on the inner side of the bottom of the ceramic ring 5. The abutment part 52 can effectively increase the friction between the ceramic ring 5 and the copper nose 2 during contact, thereby avoiding displacement of the two during welding. The ceramic ring 5 is used for heat insulation to reduce the temperature rise around the instantaneous welding spot, so that the alloy material is always welded at a low temperature during the entire welding process, and the heat-affected zone of the welding spot is small, which can not only effectively avoid the damage to the metallographic structure of the buried pipeline 1, but also reduce the probability of deformation of the copper nose 2 after welding.

[0054] Please refer to Figure 2 , Figure 4-6 , a connecting portion 22 is provided on the copper nose 2, and the connecting portion 22 is inclined to the main body of the copper nose 2. Before welding, the connecting cable 7 is first crimped on the connecting portion 22. After crimping, the height of the connecting cable 7 is higher than the main body of the copper nose 2. Then the copper nose 2 is welded to the buried pipeline 1, and multiple copper noses 2 can be continuously welded on the buried pipeline 1. A welding port 21 is provided on the copper nose 2, and the welding port 21 is arranged on the side of the copper nose 2 away from the connecting cable 7. The shape of the welding port 21 is adapted to the shape of the welding nail 4. During welding, the welding nail 4 passes through the welding port 21 on the copper nose 2, and the joint part 43 on the welding nail 4 contacts the buried pipeline 1.

[0055] Specifically, before welding, insert the welding nail 4 into the holder 33 so that the holder 33 and the welding gun head 32 are well fixed, and then the ceramic ring 5 is sleeved on the welding nail 4 so that the interlocking portion 42 on the welding nail 4 and the interlocking ring 51 on the ceramic ring 5 are well interlocked. Then, the copper nose 2 is laid flat, and the welding nail 4 is inserted into the welding port 21 on the copper nose 2. After the welding nail 4, the ceramic ring 5 and the copper nose 2 are installed, the height of the joint portion 43 on the welding nail 4 should be exposed to the end surface of the copper nose 2 by 4-5mm, and the welding gun switch is triggered, and the depth of the welding nail 4 into the copper nose is 1.5mm.

[0056] At the beginning of welding, continuous pressure is applied to the welding gun 3 to make the welding points on the ceramic ring 5, the copper nose 2 and the buried pipeline 1 tightly combined. The start switch button of the welding gun 3 is turned on, and the welding power supply first forms a small current (150A-450A) between the welding nail 4 and the welding point on the buried pipeline 1. Then the magnetic lifting mechanism of the welding gun 3 lifts the welding nail 4 under the control of the welding gun control circuit. At this time, a low-current pilot arc is formed between the welding nail 4 and the welding point on the buried pipeline 1. Then the control circuit drives the main circuit thyristor rectifier to trigger the main current to make the arc burn stably. After the main arc burns stably, the pilot current is turned off to melt the joint part 43 on the welding nail 4. 2s after the welding starts, the joint part 43 is completely melted, the current circuit is interrupted, the arc is extinguished, and the copper nose 2 is welded to the surface of the buried pipeline 1. Finally, the welding gun 3 is removed and the ceramic ring 5 is knocked off. The description of the welding method process refers to other technologies.

[0057] When welding the copper nose 2 and the buried pipeline 1, on the one hand, the welding is quickly achieved by uniformly melting the joint part 43 on the welding nail 4, avoiding the uneven heat conduction caused by the copper nose 2 being too fast, ensuring that the welding point is firm and there will be no false connection; thereby ensuring the reliability of the welding of the copper nose 2 and the buried pipeline 1, and avoiding the loosening of the connecting cable 7 in the subsequent process to affect the accuracy of the monitoring and control of the cathodic protection system after commissioning. On the other hand, during the welding process, the ceramic ring 5 is used for heat insulation to reduce the temperature rise around the welding point at the moment of welding, so that the alloy material of the low-temperature joint head 43 is always used for welding throughout the welding process, and the heat-affected zone of the welding point is small, which can not only effectively avoid the damage to the metallographic structure of the buried pipeline 1, but also reduce the probability of deformation of the copper nose 2 after welding.

[0058] Example 2, please refer to Figure 8-17 , although the melting of the welding nail 4 and the heat insulation of the ceramic ring 5 can realize the rapid welding of the copper nose 2 and the buried pipeline 1, and ensure the firmness of the welding point. However, the joint part 43 on the welding nail 4 and the buried pipeline 1 are both circular structures. After the two are abutted, they are easily displaced by force during the force application process of the welding gun 3, thereby causing the position between the welding nail 4, the copper nose 2 and the buried pipeline 1 to change, and the lifting of the welding nail 4 in the subsequent welding process will further cause the welding point to shift. Changes in the welding point between the welding nail 4, the copper nose 2 and the buried pipeline 1 during welding will cause uneven distribution of the welding liquid on the copper nose 2 and the buried pipeline 1, and will also cause the problem of insufficient welding between the copper nose 2 and the buried pipeline 1, thereby affecting the reliability of the connection between the copper nose 2 and the buried pipeline 1. Eventually, the connecting cable 7 becomes loose, affecting the subsequent monitoring accuracy of the cathodic protection system. Therefore, it is necessary to set a pre-positioning component 6 on the welding gun 3 to assist the welding nail 4 in positioning when the joint part 43 abuts against the buried pipeline 1 and in the subsequent welding process.

[0059] Please refer to Figure 8-17The pre-positioning assembly 6 includes a snap ring 61 sleeved on the welding gun head 32 and a symmetrically arranged positioning mechanism 63, and the positioning mechanism 63 includes an adjusting portion 631, a telescopic portion 632 and a positioning arc plate 633 connected in sequence. The snap ring 61 is set as a hollow cylindrical structure, and a snap groove 611 whose shape is adapted to the shape of the welding gun head 32 is opened on the snap ring 61. The snap ring 61 can be sleeved on the welding gun head 32 through the snap groove 611. A connecting plate 62 is installed at the bottom of the snap ring 61, and a mounting hole 621 is opened on the connecting plate 62. The shape of the mounting hole 621 is adapted to the shape of the welding gun head 32, and the welding gun head 32 can pass through it. The connecting plate 62 is symmetrically provided with raised portions 622 on both sides, and two adjusting portions 631 are installed at the raised portions 622 on the bottom of the connecting plate 62.

[0060] Please refer to Figure 11-14 Each adjusting part 631 includes a top plate 6311 and a screw rod 6313 installed on the top plate 6311. The top plate 6311 is connected to the bottom of the protrusion 622 and is arranged along the length direction of the protrusion 622. The screw rod 6313 is arranged along the length direction of the top plate 6311, and its end away from the center of the connecting plate 62 is connected to a driving member 6312, and the driving member 6312 can drive the screw rod 6313 to rotate. The outer wall of the screw rod 6313 is sleeved with an adjustment block 6314, and the internal shape of the adjustment block 6314 is meshed with the screw rod 6313. During the rotation of the screw rod 6313, the adjustment block 6314 can be meshed with the adjustment block 6314 to achieve a change in position relative to the length direction of the screw rod 6313. By changing the position of the adjustment block 6314, the distance between the two positioning arc plates 633 can be changed, which makes it easier for the copper nose 2 to be placed between the two positioning arc plates 633 to complete welding normally. At the same time, the distance between the two positioning arc plates 633 can be adjusted according to the sizes of different copper noses 2, thereby expanding the scope of use of the buried pipeline welding device.

[0061] Please refer to Figure 11-15 , a telescopic part 632 is installed at the bottom of the adjustment block 6314, and the telescopic part 632 includes an upper connecting rod 6321 and a lower connecting rod 6324 that are slidably connected. The upper connecting rod 6321 is connected to the bottom of the adjustment block 6314, and an inner cavity 6322 is opened inside the upper connecting rod 6321. The shape of the inner cavity 6322 is adapted to the shape of the lower connecting rod 6324, and the lower connecting rod 6324 is inserted into the inner cavity 6322. A telescopic spring 6323 is installed inside the inner cavity 6322, and the top of the lower connecting rod 6324 is connected to the telescopic spring 6323. When the lower connecting rod 6324 is subjected to force, the telescopic spring 6323 is compressed, so that the lower connecting rod 6324 moves toward the inner cavity 6322, so that the lower connecting rod 6324 can slide relative to the upper connecting rod 6321.

[0062] Please refer to Figure 10-12 and Figure 16-17A positioning arc plate 633 is installed at the bottom of each lower connecting rod 6324, and the two positioning arc plates 633 are set as symmetrical semicircular arc structures. A fitting portion 6331 is set at the bottom of each positioning arc plate 633, and the bottom of the positioning arc plate 633 abuts against the buried pipeline 1. The fitting portion 6331 is set as an arc-shaped structure that abuts against the side wall of the buried pipeline 1. When the positioning arc plate 633 abuts against the buried pipeline 1, the fitting portion 6331 abuts against the side wall of the buried pipeline 1.

[0063] Specifically, before welding the copper nose 2 and the buried pipe 1, the snap ring 61 can be first mounted on the welding gun head 32, and then the relative position of the adjustment block 6314 can be adjusted by rotating the screw rod 6313 according to the specific width of the copper nose 2, so that the spacing between the two positioning arc plates 633 can allow the copper nose 2 to pass through, thereby ensuring that the copper nose 2 can complete the welding normally.

[0064] During welding, after the welding points on the ceramic ring 5, the copper nose 2 and the buried pipe 1 are fitted, the fitting part 6331 at the bottom of the positioning arc plate 633 fits with the side wall of the buried pipe 1. In the process of continuous pressure applied by the welding gun 3, the positioning arc plate 633 is subjected to the reverse force of the buried pipe 1, so that the lower connecting rod 6324 is synchronously stressed to compress the telescopic spring 6323, and the positioning arc plate 633 can always maintain a state of fitting with the side wall of the buried pipe 1 during the entire welding process through the sliding between the lower connecting rod 6324 and the upper connecting rod 6321. In this way, the purpose of pre-positioning using the positioning arc plate 633 is achieved, and the friction between the positioning arc plate 633 and the side wall of the buried pipe 1 is used to ensure that the welding nail 4 will not be displaced from the side wall of the buried pipe 1 after being stressed.

[0065] By sleeved the pre-positioning assembly 6 on the welding gun head 32, the positioning arc plate 633 is always in contact with the side wall of the buried pipeline 1 during welding, which not only can pre-position the welding nail 4 to ensure the accuracy of the welding point position, but also can avoid displacement between the joint part 43 on the welding nail 4 and the buried pipeline 1 during the force application of the welding gun 3, resulting in inaccurate welding point position between the copper nose 2 and the buried pipeline 1, affecting the reliability of the connection between the copper nose 2 and the buried pipeline 1, and finally affecting the subsequent monitoring accuracy of the cathodic protection system.

[0066] Example 3, please refer to Figure 18-19 Based on the second embodiment of the present invention, the adjustment unit 631 is different. The adjustment unit 631 is a manual adjustment unit 634, which is as follows:

[0067] Please refer to Figure 18-19The manual adjustment part 634 includes a mounting frame 6341, a slide rail 6342 and a snap 6345 mounted on the mounting frame 6341, and a slide bar 6343 slidably mounted on the slide rail 6342. The mounting frame 6341 is mounted at the bottom of the protrusion 622 on the connecting plate 62, and the slide rail 6342 is arranged along the length direction of the mounting frame 6341. A plurality of limiting parts 6344 are arranged on the slide bar 6343, and the shapes of the slide rail 6342 and the slide bar 6343 are adapted. Pulling the end of the slide bar 6343 can make the slide bar 6343 slide along the direction of the slide rail 6342. The telescopic part 632 can be installed at the bottom of the slide bar 6343, and the telescopic part can be driven to move synchronously through the slide bar 6343.

[0068] Please refer to Figure 18-19 , the buckle 6345 is installed at one end of the mounting frame 6341, the slide bar 6343 is sleeved inside the buckle 6345, and the end of the slide bar 6343 passes through the buckle 6345. The buckle 6345 includes a first buckle block 63451 and a second buckle block 63452 that are rotatably connected, and the first buckle block 63451 is installed at the bottom of the mounting frame 6341. A buckle groove 63454 is provided between the first buckle block 63451 and the second buckle block 63452, and the shape of the buckle groove 63454 is adapted to the shape of the limiting portion 6344. A buckle clip 63453 that can be buckled on the second buckle block 63452 is rotatably installed on the first buckle block 63451, and the buckle clip 63453 can be manually pulled to achieve locking and loosening between the first buckle block 63451 and the second buckle block 63452.

[0069] Specifically, before welding the copper nose 2 and the buried pipeline 1, according to the specific width of the copper nose 2, the end of the slide bar 6343 can be pulled to slide the slide bar 6343 along the direction of the slide rail 6342. When the limit portion 6344 on the slide bar 6343 slides to the inside of the buckle groove 63454 between the first buckle block 63451 and the second buckle block 63452, the buckle clamp 63453 is manually pulled to lock the first buckle block 63451 and the second buckle block 63452, so that the position of the telescopic portion 632 and the positioning arc plate 633 can be fixed. The spacing between the two positioning arc plates 633 is enough for the copper nose 2 to pass through, ensuring that the copper nose 2 can be welded normally. When the spacing between the two positioning arc plates 633 needs to be adjusted, it is only necessary to pull the buckle clamp 63453 to loosen the first buckle block 63451 and the second buckle block 63452, and then repeat the above operation to complete the spacing adjustment.

[0070] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0072] The above is based on the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications without departing from the scope of the present invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A fast copper nose welding device for pipes, characterized by: The invention comprises a welding gun (3), a welding stud (4) and a pre-positioning assembly (6) sleeved on the welding gun (3), a ceramic ring (5) and a copper nose (2) sleeved on the welding stud (4), wherein the welding gun (3) comprises a welding gun seat (31), a welding gun head (32) and a holder (33) mounted on the welding gun seat (31), the pre-positioning assembly (6) comprises a snap ring (61) sleeved on the welding gun head (32) and a symmetrically arranged positioning mechanism (63), wherein the positioning mechanism (63) comprises a plurality of sequentially connected The clamping ring (61) is provided with a hollow cylindrical structure, a clamping groove (611) whose shape matches the shape of the welding gun head (32), a connecting plate (62) is installed at the bottom of the clamping ring (61), and a mounting hole (621) is opened on the connecting plate (62). The two positioning mechanisms (63) are installed at the bottom of the connecting plate (62), and each of the adjusting parts (631) is provided with a clamping groove (611) whose shape matches the shape of the welding gun head (32). The telescopic portion (632) includes an upper connecting rod (6321) and a lower connecting rod (6324) which are slidably connected. The upper connecting rod (6321) has an inner cavity (6322) which is provided inside the inner cavity (6322). A telescopic spring (6323) is installed, the lower connecting rod (6324) is inserted into the inner cavity (6322), and the top is connected to the telescopic spring (6323), the two positioning arc plates (633) are arranged as symmetrical semi-circular arc structures, and each positioning arc plate (633) is provided with a fitting portion (6331) at the bottom, the bottom of the positioning arc plate (633) abuts against the buried pipeline (1), and the fitting portion (6331) is arranged as a circular arc structure that fits with the side wall of the buried pipeline (1).

2. The rapid copper nose welding device for pipelines according to claim 1, characterized in that: The welding gun head (32) is configured as a cylindrical structure, one end of the welding gun head (32) is inserted into the welding gun seat (31), and the other end of the welding gun head (32) is provided with a holder (33) therein.

3. The rapid copper nose welding device for pipelines according to claim 2, characterized in that: The holder (33) is configured as a conical structure, and a holding opening (34) is provided on a side of the holder (33) away from the welding gun head (32), wherein the shape of the holding opening (34) is adapted to the shape of the welding nail (4).

4. The rapid copper nose welding device for pipelines according to claim 1, characterized in that: The welding nail (4) comprises a main body (41) and a joint portion (43) arranged at one end of the main body (41), and an embedded portion (42) is arranged around the middle of the main body (41).

5. The rapid copper nose welding device for pipelines according to claim 4, characterized in that: The ceramic ring (5) is arranged as a circular ring structure, a fitting ring (51) is provided inside the ceramic ring (5), the shape of the fitting ring (51) is adapted to the shape of the fitting portion (42), and a contact portion (52) with a sawtooth structure is arranged on the inner side of the bottom of the ceramic ring (5).

6. The rapid copper nose welding device for pipelines according to claim 1, characterized in that: The copper nose (2) is provided with a welding opening (21), the shape of the welding opening (21) being adapted to the shape of the welding nail (4), a connecting cable (7) being provided on a side of the copper nose (2) away from the welding opening (21), and a connecting portion (22) being provided between the welding opening (21) and the connecting cable (7) for connection.

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