CN210232012U

CN210232012U - Municipal administration water supply line welding set

Info

Publication number: CN210232012U
Application number: CN201920854438.4U
Authority: CN
Inventors: Zhiqiang Wang; 王志强; Ran Luo; 罗冉
Original assignee: Sinohydro Bureau 7 Co Ltd
Current assignee: Sinohydro Bureau 7 Co Ltd
Priority date: 2019-06-07
Filing date: 2019-06-07
Publication date: 2020-04-03
Anticipated expiration: 2029-06-07

Abstract

The utility model discloses a municipal water supply pipeline welding device, which comprises a water supply pipe, wherein the top of the water supply pipe is provided with a fixing device, and the top of the fixing device is provided with a transmission device; through fixing device, make this municipal administration water supply pipe welding set fix at the top of feed pipe, the workman only need hold up fixing device, do not let fixing device slide can, easy to operate, cooperation through fixing device and transmission, make transmission take welding set to use the axis of feed pipe at the uniform velocity of center rotation, and then make welding speed invariable, help improving welding quality, through welding set, pusher constant voltage equipment's cooperation, provide a invariable decurrent pressure for the welding electrode, make the bottom of welding electrode invariable to the pressure of feed pipe, further improve welding quality, welding quality receives the influence of human factor minimum, easy control, welding quality is good, water supply pipe after the welding can not leak, the waste of water resource has been reduced.

Description

Municipal administration water supply line welding set

Technical Field

The utility model relates to a water supply line welding equipment field, more specifically say, relate to a municipal administration water supply line welding set.

Background

The pipeline is a device which is connected by pipes, pipe connectors, valves and the like and used for conveying gas, liquid or fluid with solid particles, and is widely applied to municipal water supply, drainage, heat supply, gas supply, long-distance oil and gas conveying, agricultural irrigation, hydraulic engineering and various industrial devices.

The device that is used for municipal water supply pipeline welded at present comprises electric welding and soldering turret, during the use, artifical handheld soldering turret welds water supply pipeline, welding speed and welding electrode are controlled by the workman to the pressure of water supply pipe, the operation degree of difficulty is great, inconvenient welding operation carries out, welding quality is influenced by human factor moreover great, be difficult to control, welding quality is poor, water supply pipeline after the welding leaks easily, cause the waste of water resource, consequently need to design a municipal water supply pipeline welding set urgently.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved

The device that is used for municipal water supply pipe welded to current that exists among the prior art comprises electric welding and soldering turret, during the use, artifical handheld soldering turret welds water supply pipe, welding speed and welding electrode are controlled by the workman to the pressure of water supply pipe, and the operation degree of difficulty is great, and inconvenient welding operation carries out, and welding quality receives the human factor to influence great moreover, and is difficult to control, and welding quality is poor, and the water supply pipe after the welding leaks easily, causes the problem of water waste, the utility model aims to provide a municipal water supply pipe welding set, the problem that provides in the solution background art that it can be fine.

2. Technical scheme

In order to solve the above problems, the utility model adopts the following technical proposal.

A municipal water supply pipeline welding device comprises a water supply pipe, wherein a fixing device is arranged at the top of the water supply pipe, a transmission device is arranged at the top of the fixing device, and a welding device is arranged at the top of the transmission device;

the fixing device comprises a fixing plate, the inner wall of the fixing plate is connected with a magnet plate, the magnet plate is movably clamped outside the water supply pipe, the right end of the fixing plate is connected with a first gear ring, the end part of the first gear ring is provided with an inserting hole, the inner wall of the inserting hole is provided with a fixing groove, the inner wall of the fixing groove is connected with a clamping column through a clamping spring in a transmission manner, the clamping column is connected with the inner wall of the fixing groove in a sliding manner, the left end face of the clamping column is connected with a pull wire, the other end of the pull wire penetrates through a clamping spring and extends to the outside of the first gear ring and is connected with a pull ring, the inside of the inserting hole is inserted with the inserting column, the left side face of the inserting column is provided with a clamping groove, the end part of the inserting column is connected with a second gear ring;

transmission includes the transmission case, the bottom surface slip joint of transmission case is in the inside in track groove, driving motor is installed to the right flank bolt of transmission case inner chamber, driving motor's output shaft has the rotation axis, the other end of rotation axis is connected with the left surface of transmission case inner chamber, the external fixation of rotation axis has cup jointed drive gear, drive gear can mesh with first ring gear and second ring gear, the right flank fixedly connected with of transmission case inner chamber is located the spacing section of thick bamboo of driving motor below, the inner wall connection of spacing section of thick bamboo has the coil, the right flank of spacing section of thick bamboo inner chamber is connected with the magnet post through the transmission of elastic cord, the magnet post slides with spacing section of thick bamboo and cup joints.

Preferably, welding set includes the pressure tank, the bottom surface of pressure tank is connected with the top surface of transmission case, the bottom surface of pressure tank inner chamber is connected with the inflator, the other end of inflator extends to the outside of pressure tank, the inside slip of inflator has cup jointed aerifys the piston, the top surface of aerifing the piston is connected with the action bars, the top of action bars extends to the outside of inflator and is connected with the operation panel, the bottom intercommunication of inflator right flank has the check valve of giving vent to anger, the bottom intercommunication of inflator left surface has the check valve that admits air, the other end intercommunication of the check valve that admits air has the intake pipe, the other end interlude of intake pipe is on the left surface of pressure tank and with exterior space intercommunication, the inside of pressure tank is equipped with the.

Preferably, the pushing device comprises a fixed cylinder, the fixed cylinder is inserted on the bottom surface of the pressure tank, the top end of the fixed cylinder is connected with the top surface of the inner cavity of the pressure tank, the front bottom end of the fixed cylinder is provided with an air release hole positioned outside the pressure tank, the top surface of the inner cavity of the fixed cylinder is provided with a constant pressure device, a pushing piston is sleeved in the fixed cylinder in a sliding manner, the bottom surface of the pushing piston is connected with a pushing rod, the bottom end of the pushing rod extends to the outside of the fixed cylinder and is connected with a welding head, the top surface of the inner cavity of the welding head is connected with a conductive elastic sheet, the inner wall of the welding head is connected with a fixed magnetic ring positioned below the conductive elastic sheet, one end of the conductive elastic sheet penetrates through a round hole in the middle of the fixed magnetic ring, a conductive plate is sleeved in the welding head in a sliding manner, the top surface, the middle part of soldered connection inner chamber bottom surface is connected with the conducting block, and the mounting groove has been seted up to the top surface of conducting block, and the inner wall connection of mounting groove has the centre gripping shell fragment, and the quantity of centre gripping shell fragment is two, and the centre gripping has the welding electrode between two centre gripping shell fragments, and the bottom of welding electrode extends to the outside of soldered connection.

Preferably, constant voltage equipment includes the constant voltage case, the surface of constant voltage case and the interior wall connection of a fixed section of thick bamboo, the right flank of constant voltage incasement chamber is connected with the movable block through the transmission of constant voltage bellows, the inner wall sliding connection of movable block and constant voltage case, the left end of constant voltage bottom of the case face is connected with the constant pressure block, the constant voltage groove has been seted up to the top surface of constant pressure block, the venthole that communicates with the constant voltage groove is seted up to the right flank of constant pressure block, the left flank of constant pressure block is connected with the gas-supply pipe with constant voltage groove intercommunication, the left end interlude of gas-supply pipe just communicates with the inside space of pressure case on the left surface of a fixed section of thick bamboo, the underrun through reset spring transmission of constant voltage inslot chamber is connected with the end cap, the inner wall sliding connection of end cap and constant voltage groove, the top surface of end cap is connected with the transmission.

3. Advantageous effects

Compared with the prior art, the utility model has the advantages of:

the municipal water supply pipeline welding device can be fixed at the top of the water supply pipe through the fixing device, workers only need to hold the fixing device and do not slide the fixing device, the workload is small, the operation is easy, the welding operation is convenient, the workload of the workers is reduced, the transmission device drives the welding device to rotate at a constant speed by taking the central axis of the water supply pipe as the center through the matching of the fixing device and the transmission device, and then make welding speed invariable, help improving welding quality, through welding set, pusher constant voltage equipment's cooperation, provide a invariable decurrent pressure for the welding electrode, make the bottom of welding electrode invariable to the pressure of feed pipe, further improve welding quality, welding quality receives the influence of human factor minimum, easy control, and welding quality is good, and the water supply pipe after the welding can not leak, has reduced the waste of water resource.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the internal structure of the fixing device of FIG. 1 according to the present invention;

FIG. 3 is a schematic view of the upper ring gear of FIG. 2 according to the present invention;

FIG. 4 is an enlarged schematic view of the structure at A in FIG. 3 according to the present invention;

FIG. 5 is a schematic view of the internal structure of the transmission of FIG. 1 according to the present invention;

fig. 6 is a schematic view of the internal structure of the limiting cylinder in fig. 5 according to the present invention;

FIG. 7 is a schematic view of the internal structure of the welding device of FIG. 1 according to the present invention;

fig. 8 is a schematic diagram illustrating an internal structure of the pushing device of fig. 7 according to the present invention;

fig. 9 is a schematic view showing an internal structure of the constant pressure device of fig. 8 according to the present invention.

The reference numbers in the figures illustrate:

1. a water supply pipe; 2. a fixing device; 201. a fixing plate; 202. a magnet plate; 203. an upper half gear ring; 204. inserting holes; 205. fixing grooves; 206. clamping a spring; 207. a clamping column; 208. a pull wire; 209. inserting the column; 210. a clamping groove; 211. a lower half gear ring; 212. a track groove; 3. a transmission device; 31. a transmission case; 32. a drive motor; 33. a rotating shaft; 34. a drive gear; 35. a limiting cylinder; 36. a coil; 37. an elastic cord; 38. a magnet column; 4. a welding device; 41. a pressure tank; 42. an air cylinder; 43. an inflation piston; 44. an operating lever; 45. an air outlet one-way valve; 46. an air inlet check valve; 47. an air inlet pipe; 5. a pushing device; 500. a fixed cylinder; 501. pushing the piston; 502. a push rod; 503. welding a head; 504. a conductive spring plate; 505. fixing the magnetic ring; 506. a conductive plate; 507. a movable magnetic ring; 508. a limiting rod; 509. a conductive block; 510. mounting grooves; 511. clamping the elastic sheet; 512. welding electrodes; 6. a constant pressure device; 60. a drive line; 61. a constant pressure box; 62. a constant pressure bellows; 63. a movable block; 64. constant pressure blocks; 65. a constant pressure tank; 66. an air outlet; 67. a gas delivery pipe; 68. a return spring; 69. and (7) a plug.

Detailed Description

The drawings in the embodiments of the present invention will be combined; the technical scheme in the embodiment of the utility model is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the present invention; rather than all embodiments. Based on the embodiment of the utility model; all other embodiments obtained by a person skilled in the art without making any inventive step; all belong to the protection scope of the utility model.

Referring to fig. 1-9, a municipal water supply pipe welding device comprises a water supply pipe 1, the water supply pipe 1 is connected with a return line of an external motor, a fixing device 2 is arranged on the top of the water supply pipe 1, a transmission device 3 is arranged on the top of the fixing device 2, and a welding device 4 is arranged on the top of the transmission device 3.

The fixing device 2 comprises a fixing plate 201, a magnet plate 202 is connected to the inner wall of the fixing plate 201, the magnet plate 202 is movably clamped outside the water supply pipe 1, an upper gear ring 203 is connected to the right end of the fixing plate 201, an insertion hole 204 is formed in the end portion of the upper gear ring 203, a fixing groove 205 is formed in the inner wall of the insertion hole 204, a clamping column 207 is connected to the inner wall of the fixing groove 205 in a transmission mode through a clamping spring 206, the clamping column 207 is connected to the inner wall of the fixing groove 205 in a sliding mode, a pull wire 208 is connected to the left end face of the clamping column 207, the other end of the pull wire 208 penetrates through the clamping spring 206 and extends to the outside of the upper gear ring 203 and is connected with a pull ring, an insertion column 209 is inserted into the insertion hole 204, a clamping groove 210 is formed in the left side face of the insertion column 209, the clamping groove 210 is inserted into the end portion, the side surfaces of the upper gear half ring 203 and the lower gear half ring 211 are both provided with track grooves 212.

The transmission device 3 comprises a transmission case 31, the bottom surface of the transmission case 31 is in sliding clamping connection with the inside of the track groove 212, a driving motor 32 is installed on the right side face of the inner cavity of the transmission case 31 through a bolt, the model of the driving motor 32 is Y80M2-2, an output shaft of the driving motor 32 is connected with a rotating shaft 33, the other end of the rotating shaft 33 is connected with the left side face of the inner cavity of the transmission case 31, a driving gear 34 is fixedly sleeved on the outside of the rotating shaft 33, the driving gear 34 can be meshed with the upper half gear ring 203 and the lower half gear ring 211, the right side face of the inner cavity of the transmission case 31 is fixedly connected with a limiting cylinder 35 located below the driving motor 32, the inner wall of the limiting cylinder 35 is connected with a coil 36, the right side face of the inner cavity of the limiting cylinder.

The welding device 4 comprises a pressure box 41, the bottom surface of the pressure box 41 is connected with the top surface of the transmission box 31, the bottom surface of the inner cavity of the pressure box 41 is connected with an air cylinder 42, the other end of the air cylinder 42 extends to the outside of the pressure box 41, an inflation piston 43 is slidably sleeved in the air cylinder 42, the top surface of the inflation piston 43 is connected with an operating rod 44, the top end of the operating rod 44 extends to the outside of the air cylinder 42 and is connected with an operating panel, the bottom end of the right side surface of the air cylinder 42 is communicated with an air outlet one-way valve 45, the bottom end of the left side surface of the air cylinder 42 is communicated with an air inlet one-way valve 46, the other end of the air inlet one-way valve 46 is communicated with an air inlet pipe 47, the other end of the air inlet pipe 47.

The pushing device 5 comprises a fixed cylinder 500, the fixed cylinder 500 is inserted on the bottom surface of the pressure tank 41, the top end of the fixed cylinder 500 is connected with the top surface of the inner cavity of the pressure tank 41, the bottom end of the front surface of the fixed cylinder 500 is provided with an air release hole positioned outside the pressure tank 41, the top surface of the inner cavity of the fixed cylinder 500 is provided with a constant pressure device 6, the inner part of the fixed cylinder 500 is slidably sleeved with a pushing piston 501, the pushing piston 501 is slidably connected with the inner wall of the fixed cylinder 500, the pushing piston 501 cannot slide downwards under the gravity of a pushing rod 502, a welding head 503 and internal original parts thereof, the bottom surface of the pushing piston 501 is connected with a pushing rod 502, the bottom end of the pushing rod 502 extends to the outside of the fixed cylinder 500 and is connected with the welding head 503, the top surface of the inner cavity of the welding head 503 is connected with a conductive elastic sheet 504, the inner wall of, the current-conducting plate 506 is sleeved on the inner portion of the welding head 503 in a sliding mode, the current-conducting plate 506 is connected with an output line of an external electric welding machine, the top surface of the current-conducting plate 506 is connected with the movable magnetic ring 507, the movable magnetic ring 507 is connected with the inner wall of the welding head 503 in a sliding mode, the bottom surface of the current-conducting plate 506 is connected with the limiting rod 508, the bottom end of the limiting rod 508 extends to the outside of the welding head 503, the middle of the bottom surface of the inner cavity of the welding head 503 is connected with a current-conducting block 509, a mounting groove 510 is formed in the top surface of the current-conducting block 509, the inner wall of the mounting groove 510 is connected with two clamping.

Constant voltage device 6 includes constant pressure case 61, the surface of constant pressure case 61 and the interior wall connection of a fixed section of thick bamboo 500, the right flank of the constant pressure case 61 inner chamber is connected with movable block 63 through the transmission of constant pressure bellows 62, the inner wall sliding connection of movable block 63 and constant pressure case 61, the left end of constant pressure case 61 bottom surface is connected with constant pressure block 64, constant pressure groove 65 has been seted up to the top surface of constant pressure block 64, the venthole 66 with constant pressure groove 65 intercommunication has been seted up to the right flank of constant pressure block 64, the left flank of constant pressure block 64 is connected with the air pipe 67 with constant pressure groove 65 intercommunication, the left end of air pipe 67 alternates on the left surface of a fixed section of thick bamboo 500 and communicates with the inside space of pressure tank 41, the bottom surface of constant pressure groove 65 inner chamber is connected with end cap 69 through reset spring 68 transmission, end cap 69 and the inner wall sliding connection of constant pressure groove 65, the top surface of end cap 69 is connected with transmission line 60, the other end of transmission line 60 extends to the inside.

The working principle is as follows:

firstly, connecting a water supply pipe 1 with a return line of an electric welding machine, clamping a magnet plate 202 at the top of the water supply pipe 1, fixing a fixing plate 201 by utilizing the magnetic attraction between the magnet plate 202 and the water supply pipe 1, then holding the fixing plate 201 by a worker through a handle at the top of 21 to enable the fixing plate 201 to be more stable and not to slide, then pulling a pull wire 208, pulling the clamping column 207 to slide towards the inside of a fixing groove 205 by the pull wire 208, then inserting an inserting column 209 on a lower half gear ring 211 into an inserting hole 204, then loosening the pull wire 208, inserting the clamping column 207 into a clamping groove 210 under the elastic force of a clamping spring 206, limiting the inserting column 209 to enable the lower half gear ring 211 and an upper half gear ring 203 to be fixed together, then pulling an operating rod 44 upwards, driving an inflating piston 43 to move upwards by the operating rod 44, sucking external air into an air cylinder 42 through 47 and an air inlet one-way valve 46, and, the operating rod 44 is pressed downwards, the operating rod 44 drives the inflating piston 43 to move downwards and press air in the air cylinder 42, the air in the air cylinder 42 is extruded into the pressure tank 41 through the air outlet one-way valve 45, the reciprocating operation is carried out, the air pressure in the pressure tank 41 is gradually increased, then the air in the pressure tank 41 enters the fixed cylinder 500 through the air pipe 67 and the air outlet 66, the pushing piston 501 slides downwards under the pushing of the air, the pushing piston 501 drives the welding head 503 to move downwards through the pushing rod 502, the welding head 503 drives the welding rod 512 to move downwards until the bottom end of the welding rod 512 is in contact with the surface of the water supply pipe 1, the pushing piston 501 is limited and cannot slide downwards, then the air pressure in the fixed cylinder 500 is increased, the constant pressure bellows 62 contracts under the action of the pressure difference between the air pressure in the fixed cylinder 500 and pulls the movable block 63, the movable block 63 pulls the transmission line 60, the driving wire 60 pulls the plug 69 to move upwards until the plug 69 plugs the air pipe 67 and the air outlet 66, so that the internal pressure of the fixed cylinder 500 is constant, then the power supply of the electric welding machine is switched on, the electric welding machine and the driving motor 32 run simultaneously, the driving motor 32 drives the driving gear 34 to rotate through the rotating shaft 33, the driving gear 34 enables the transmission case 31 to move along the circumference of the upper half gear ring 203 and the lower half gear ring 211 through the meshing action of the driving gear and the upper half gear ring 203 and the lower half gear ring 211, so that the welding electrode 512 moves around the circumference of the water supply pipe 1 to weld the water supply pipe 1, the length of the welding electrode 512 is gradually shortened in the welding process, the pushing piston 501 moves downwards under the action of the gas pressure, so that the gas pressure in the fixed cylinder 500 is reduced, then the gas in the constant pressure corrugated pipe 62 expands, so that the constant pressure corrugated pipe 62 is extended, and then, the air pipe 67 and the air outlet 66 are opened, then the high-pressure air in the pressure tank 41 enters the fixed cylinder 500 to maintain the constant air pressure in the fixed cylinder 500, so that the pressure of the welding electrode 512 to the water supply pipe 1 is constant, when the length of the welding electrode 512 is too short, the bottom end of the limiting rod 508 is contacted with the water supply pipe 1 and is extruded, the conductive plate 506 moves upwards, then the conductive plate 506 is separated from the conductive block 509, the driving motor 32 stops running, the welding device 4 is fixed, meanwhile, the conductive plate 506 is contacted with the conductive elastic sheet 504, the power supply of the coil 36 is switched on, the coil 36 is electrified to generate an electromagnetic field, then the magnet column 38 moves leftwards under the magnetic repulsion force, the magnet column 38 is meshed with the teeth on the upper half gear ring 203 and the lower half gear ring 211, the welding device 4 is limited, the welding device 4 stops moving, then the welding head 503 is pressed downwards, so that the movable magnet ring 507 and the fixed magnet ring 505, at this time, the pushing piston 501 moves downwards to the lowest point, the air release hole is opened, the high-pressure gas in the fixed cylinder 500 and the pressure tank 41 flows out through the air release hole, then the welding head 503 is pulled upwards, the top end of the welding head 503 is contacted with the bottom end of the fixed cylinder 500, then the residual welding rod 512 is pulled out, a new welding rod 512 is inserted between the two clamping elastic sheets 511, then the limiting rod 508 is pulled downwards, the fixed magnetic ring 505 is separated from the movable magnetic ring 507, the conducting plate 506 is contacted with the conducting block 509, and then the steps are repeated until the welding is finished.

The above; is only a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; according to the technical scheme of the utility model and the improvement conception, equivalent substitution or change is carried out; are all covered by the protection scope of the utility model.

Claims

1. The utility model provides a municipal administration water supply pipe welding set, includes feed pipe (1), its characterized in that: the top of the water supply pipe (1) is provided with a fixing device (2), the top of the fixing device (2) is provided with a transmission device (3), and the top of the transmission device (3) is provided with a welding device (4);

the fixing device (2) comprises a fixing plate (201), the inner wall of the fixing plate (201) is connected with a magnet plate (202), the magnet plate (202) is movably clamped outside the water supply pipe (1), the right end of the fixing plate (201) is connected with a first gear ring (203), the end part of the first gear ring (203) is provided with an inserting hole (204), the inner wall of the inserting hole (204) is provided with a fixing groove (205), the inner wall of the fixing groove (205) is connected with a clamping column (207) in a transmission mode through a clamping spring (206), the clamping column (207) is connected with the inner wall of the fixing groove (205) in a sliding mode, the left end face of the clamping column (207) is connected with a pull wire (208), the other end of the pull wire (208) penetrates through the clamping spring (206) and extends to the outside of the first gear ring (203) and is connected with a pull ring, an inserting column (209) is inserted inside the, the clamping groove (210) is inserted into the end part of the clamping column (207), the bottom end of the insertion column (209) is connected with a lower half gear ring (211), the end face of the lower half gear ring (211) is in contact connection with the end face of the upper half gear ring (203), and the side faces of the upper half gear ring (203) and the lower half gear ring (211) are both provided with track grooves (212);

transmission (3) are including transmission case (31), the inside of the bottom surface slip joint in track groove (212) of transmission case (31), driving motor (32) is installed to the right flank bolt of transmission case (31) inner chamber, the output shaft of driving motor (32) has rotation axis (33), the other end and the left surface of transmission case (31) inner chamber of rotation axis (33) are connected, drive gear (34) have been cup jointed to the external fixation of rotation axis (33), drive gear (34) can with first ring gear (203) and lower ring gear (211) meshing, the right flank fixedly connected with of transmission case (31) inner chamber is located spacing section of thick bamboo (35) of driving motor (32) below, the inner wall connection of spacing section of thick bamboo (35) has coil (36), the right flank of spacing section of thick bamboo (35) inner chamber is connected with magnet post (38) through elasticity rope (37) transmission, magnet post (38) and spacing section of thick bamboo (35) slip cup joint.

2. The municipal water supply pipe welding device according to claim 1, wherein: the welding device (4) comprises a pressure box (41), the bottom surface of the pressure box (41) is connected with the top surface of a transmission box (31), the bottom surface of the inner cavity of the pressure box (41) is connected with an air cylinder (42), the other end of the air cylinder (42) extends to the outside of the pressure box (41), an inflation piston (43) is sleeved in the air cylinder (42) in a sliding mode, the top surface of the inflation piston (43) is connected with an operating rod (44), the top end of the operating rod (44) extends to the outside of the air cylinder (42) and is connected with an operating panel, the bottom end of the right side surface of the air cylinder (42) is communicated with an air outlet one-way valve (45), the bottom end of the left side surface of the air cylinder (42) is communicated with an air inlet one-way valve (46), the other end of the air inlet one-way valve (46) is communicated with an air inlet pipe (47), the other end of the air inlet pipe (47) penetrates through the left side surface.

3. The municipal water supply pipe welding device according to claim 2, wherein: the pushing device (5) comprises a fixed cylinder (500), the fixed cylinder (500) is inserted on the bottom surface of the pressure box (41), the top end of the fixed cylinder (500) is connected with the top surface of the inner cavity of the pressure box (41), the front bottom end of the fixed cylinder (500) is provided with an air leakage hole positioned outside the pressure box (41), the top surface of the inner cavity of the fixed cylinder (500) is provided with a constant pressure device (6), the inner part of the fixed cylinder (500) is sleeved with a pushing piston (501) in a sliding manner, the bottom surface of the pushing piston (501) is connected with a pushing rod (502), the bottom end of the pushing rod (502) extends to the outer part of the fixed cylinder (500) and is connected with a welding head (503), the top surface of the inner cavity of the welding head (503) is connected with a conductive elastic sheet (504), the inner wall of the welding head (503) is connected with a fixed magnetic ring (505) positioned below the conductive elastic, the inside slip of soldered connection (503) has cup jointed conducting plate (506), the top surface of conducting plate (506) is connected with activity magnetosphere (507), the inner wall sliding connection of activity magnetosphere (507) and soldered connection (503), the bottom surface of conducting plate (506) is connected with gag lever post (508), the bottom of gag lever post (508) extends to the outside of soldered connection (503), the middle part of soldered connection (503) inner chamber bottom surface is connected with conducting block (509), mounting groove (510) have been seted up to the top surface of conducting block (509), the inner wall connection of mounting groove (510) has centre gripping shell fragment (511), the quantity of centre gripping shell fragment (511) is two, the centre gripping has electrode (512) between two centre gripping shell fragments (511), the bottom of electrode (512) extends to the outside of soldered connection (503).

4. The municipal water supply pipe welding device according to claim 3, wherein: the constant pressure device (6) comprises a constant pressure box (61), the surface of the constant pressure box (61) is connected with the inner wall of a fixed cylinder (500), the right side surface of the inner cavity of the constant pressure box (61) is connected with a movable block (63) through a constant pressure corrugated pipe (62) in a transmission way, the movable block (63) is connected with the inner wall of the constant pressure box (61) in a sliding way, the left end of the bottom surface of the constant pressure box (61) is connected with a constant pressure block (64), a constant pressure groove (65) is formed in the top surface of the constant pressure block (64), an air outlet hole (66) communicated with the constant pressure groove (65) is formed in the right side surface of the constant pressure block (64), the left side surface of the constant pressure block (64) is connected with an air conveying pipe (67) communicated with the constant pressure groove (65), the left end of the air conveying pipe (67) is inserted on the left side surface of the fixed cylinder (500) and communicated with the space inside the pressure box (41), the bottom surface of the inner, the plug (69) is connected with the inner wall of the constant-pressure groove (65) in a sliding mode, the top face of the plug (69) is connected with a transmission line (60), and the other end of the transmission line (60) extends into the constant-pressure box (61) and is connected with the left side face of the movable block (63).