Pressure pipeline welding preheating device

Abstract

The invention relates to the technical field of pipeline welding, and discloses a pressure pipeline welding preheating device which comprises a fixed mounting mechanism, two gas guide flaming mechanisms are movably mounted on the surface of the fixed mounting mechanism, and the two gas guide flaming mechanisms are oppositely distributed; windproof flow guiding mechanisms are fixedly arranged on the sides, away from the fixed mounting mechanism, of the two gas guiding and fire spraying mechanisms, and welding and fire blocking mechanisms are arranged on the sides, away from the gas guiding and fire spraying mechanisms, of the two windproof flow guiding mechanisms. According to the pressure pipeline welding preheating device, through the arrangement of the fixed mounting mechanism, the gas guiding and fire spraying mechanism, the windproof flow guiding mechanism and the welding fire blocking mechanism, external airflow interference can be effectively blocked through the windproof flow guiding mechanism in the using process, it is ensured that flames continuously burn in a relatively stable environment, and meanwhile by means of an anti-extinguishing heating wire arranged inside, the pressure pipeline welding preheating device is convenient to use. Instantaneous ignition and reburning can be achieved when flames are extinguished accidentally, and therefore the anti-interference capacity and stability of the flames are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline welding, in particular to a pressure pipeline welding preheating device. BACKGROUND

[0002] Pre-welding preheating is a process measure of appropriately heating the local and overall welding parts before welding, and its purpose is to reduce the cooling speed of the welding joint, avoid the generation of hardened structure and reduce the welding stress and deformation, which is an effective method to prevent welding cracks, and the pre-welding preheating method mainly includes flame heating, heating furnace heating and far infrared heating, and when preheating, a surface contact thermometer should be used to measure the temperature within the range of 30-50mm on both sides of the to-be-welded area.

[0003] When performing welding preheating operation, a spray gun flame is usually directly used to heat the pressure pipeline, however, part of the pressure pipeline welding construction is often carried out outdoors, and the environmental airflow disturbance is large, which is easy to cause unstable flame flow in the preheating process, and even causes the phenomenon of flameout. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a pressure pipeline welding preheating device, which solves the problems mentioned in the background.

[0005] The present application provides the following technical scheme: a pressure pipeline welding preheating device, comprising: a fixed mounting mechanism, a gas guide and flame spraying mechanism is movably mounted on the surface of the fixed mounting mechanism, the number of the gas guide and flame spraying mechanism is two, and the two gas guide and flame spraying mechanisms are oppositely distributed, a windproof and flow guide mechanism is fixedly arranged on the side of the two gas guide and flame spraying mechanisms away from the fixed mounting mechanism, a welding fire blocking mechanism is arranged on the side of the two windproof and flow guide mechanisms away from the gas guide and flame spraying mechanism, the fixed mounting mechanism comprises a first locking ring and a second locking ring, the second locking ring is rotatably connected to one end of the first locking ring, the gas guide and flame spraying mechanism comprises a curved sliding guide block and an air inlet guide cover, the number of the curved sliding guide block is two, and the two second locking rings are movably connected to the surface of the first locking ring and the second locking ring, the air inlet guide cover is fixedly connected to the surface of the curved sliding guide block, the windproof and flow guide mechanism comprises a connecting cover, an anti-extinguishing heating wire and a fire guide cover, the connecting cover is fixedly connected to the surface of the air inlet guide cover away from the curved sliding guide block, the anti-extinguishing heating wire is fixedly connected to the inside of the connecting cover, the fire guide cover is fixedly connected to the side of the connecting cover away from the air inlet guide cover, and the welding fire blocking mechanism comprises a fire blocking snap ring, the fire blocking snap ring is movably arranged on the side of the two fire guide covers away from the connecting cover.

[0006] Preferably, the fixed mounting mechanism further comprises a first limiting slide rail and a first connecting lug, the first limiting slide rail is embedded in the surface of the first locking ring, and the first connecting lug is integrally arranged at the free end of the first locking ring.

[0007] Preferably, the fixed mounting mechanism further comprises a second limiting slide rail and a second connecting lug, the second limiting slide rail is embedded in the surface of the second locking ring, and the second connecting lug is integrally arranged at the free end of the second locking ring, and the two curved sliding guide blocks are slidingly connected between the second limiting slide rail and the first limiting slide rail.

[0008] Preferably, the fixed mounting mechanism further comprises a threaded cylinder, a threaded lock column and a twisting handle, the threaded cylinder is fixedly inserted into the inside of the first connecting lug, the threaded lock column is threadedly connected to the inside of the threaded cylinder, the surface of the threaded lock column is slidingly connected with the inner wall of the second connecting lug when the threaded lock column is connected with the threaded cylinder, and the twisting handle is fixedly sleeved at one end of the threaded lock column.

[0009] Preferably, the air guide and fire spraying mechanism further comprises a slip-resistant strip and a deflection tooth block, the slip-resistant strips are integrally arranged on both sides of the two curved sliding guide blocks respectively, and the deflection tooth blocks are fixedly connected at both ends of the two curved sliding guide blocks, and the adjacent two deflection tooth blocks are engaged with each other when the two curved sliding guide blocks are installed.

[0010] Preferably, the air guide and fire spraying mechanism further comprises an oxygen inlet waist hole, a holding handle, an anti-scald sleeve, a distribution cavity and a jet head, the oxygen inlet waist hole is penetratingly formed in the surface of the air inlet guide cover, the number of the oxygen inlet waist holes is multiple, and the multiple oxygen inlet waist holes are uniformly distributed, the holding handle is fixedly connected to the surface of the air inlet guide cover, the anti-scald sleeve is fixedly sleeved on the surface of the holding handle, the distribution cavity is formed in the inside of the air inlet guide cover, the jet head is fixedly inserted into the inner surface of the air inlet guide cover, the jet head is in communication with the distribution cavity, the number of the jet heads is multiple, the multiple jet heads are uniformly distributed, and the oxygen inlet waist hole is located outside the jet head.

[0011] Preferably, the air guide and fire spraying mechanism further comprises a distribution air guide hose, a three-way butt joint pipe, a common air guide hose and an external connector, the number of the distribution air guide hoses is two, the two distribution air guide hoses are fixedly connected to the surfaces of the two air inlet guide covers respectively, and the two distribution air guide hoses are in communication with the two distribution cavities respectively, the three-way butt joint pipe is fixedly connected between the ends of the two distribution air guide hoses away from the air inlet guide cover, the common air guide hose is fixedly connected to one end of the three-way butt joint pipe, and the external connector is fixedly connected to the end of the common air guide hose away from the three-way butt joint pipe.

[0012] Preferably, the windproof air guide mechanism further comprises an isolation plate and a fire-retardant mesh, the isolation plate is integrally arranged on the inner wall of the connecting cover, and the inner diameter length of the isolation plate is equal to the inner diameter length of the first locking ring, the fire-retardant mesh is fixedly connected to the inside of the isolation plate, one end of the jet head penetrates through one side of the isolation plate and extends to the other side of the isolation plate, and the anti-extinguishing heating wire and the oxygen inlet hole are located on the two sides of the isolation plate.

[0013] Preferably, the windproof air guide mechanism further comprises a folded air guide cover and a smoke exhaust hole, the folded air guide cover is integrally arranged at one end of the fire guide cover away from the connecting cover, the smoke exhaust hole is arranged on the surface of the fire guide cover, and the smoke exhaust hole is located in the interior of the folded air guide cover, and the outer surface of the fire guide cover is provided with a smoke guide inclined surface.

[0014] Preferably, the welding fire plugging mechanism further comprises a fracture, an anti-skid tooth block and a pushing cylinder, the fracture is arranged on the surface of the fire plugging ring, the surface of the fire plugging ring is attached to the surface of the folded air guide cover when the fire plugging ring is installed, the anti-skid tooth block is fixedly connected to the inside of the fire plugging ring, the fire plugging ring is a elastic ring, and the number of the pushing cylinders is two, and the two fire plugging rings are respectively fixedly inserted into the two ends of the fire plugging ring.

[0015] Compared with the prior art, the present application has the following advantages: The pressure pipeline welding preheating device can effectively block external airflow interference through the windproof air guide structure during use, ensure that the flame continues to burn in a relatively stable environment, and realize instantaneous ignition and reignition when the flame is accidentally extinguished by means of the internal anti-extinguishing heating wire, thereby significantly improving the anti-interference ability and stability of the flame.

[0016] The pressure pipeline welding preheating device can be fixedly installed on the surface of the pressure pipeline at a specified position during use by means of the first locking ring, the second locking ring, the first limiting slide rail, the first connecting lug, the second limiting slide rail, the second connecting lug, the threaded cylinder, the threaded locking column and the twisting hand wheel, thereby ensuring that the device is stable on the surface of the pressure pipeline for preheating work.

[0017] The pressure pipeline welding preheating device can distribute and inject the combustible gas in the gas cylinder into the interior during use by means of the curved sliding guide block, the air inlet guide cover, the anti-slip strip, the anti-deviation tooth block, the oxygen inlet hole, the holding handle, the anti-scald sleeve, the distribution cavity, the jet head, the distribution air hose, the three-way butt joint pipe, the common air hose and the external connector, thereby ensuring that the flame is evenly distributed on the surface of the pressure pipeline during preheating, and facilitating the disassembly and angle adjustment of the air inlet guide cover through the butt joint of the curved sliding guide block.

[0018] The pressure pipeline welding preheating device can isolate the flame in the fire guide cover and preheat the pressure pipeline by combustion, and can ensure the oxygen flow while blocking the flame from burning towards the air inlet guide cover through the isolation plate and the fire-retardant net, and can re-ignite the combustible gas when the flame is extinguished by disturbance through the anti-extinguishing heating wire, ensure the flame to be re-ignited, and improve the anti-interference effect.

[0019] The pressure pipeline welding preheating device can close one end of the fire guide cover by using the fire blocking snap ring during use, so that smaller flames can maintain combustion inside the fire guide cover, thereby reducing heat loss of the pressure pipeline during welding and improving the welding effect. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The figure is a structural schematic diagram of the present application; Figure 2 The figure is a bottom view structural schematic diagram of the present application; Figure 3 The figure is a side view structural schematic diagram of the present application; Figure 4 The figure is an explosive structural schematic diagram of the present application; Figure 5 The figure is a structural schematic diagram of the present application during installation; Figure 6 The figure is a side view structural schematic diagram of the present application during installation; Figure 7 The figure is an explosive structural schematic diagram of the present application during installation; Figure 8 The figure is an explosive structural schematic diagram of the present application at the position of the air guide and ignition mechanism; Figure 9 The figure is an explosive structural schematic diagram of the present application at the position of the windproof and flow guide mechanism; Figure 10 The figure is a structural schematic diagram of the welding fire blocking mechanism of the present application.

[0021] In the figure: 101, first locking ring; 102, second locking ring; 103, first limiting slide rail; 104, first connecting lug; 105, second limiting slide rail; 106, second connecting lug; 107, threaded cylinder; 108, threaded locking column; 109, twisting hand wheel; 201, bent slide guide block; 202, air inlet guide cover; 203, anti-slip bar; 204, anti-deviation tooth block; 205, oxygen inlet waist hole; 206, holding handle; 207, anti-scald sleeve; 208, distribution cavity; 209, air jet head; 210, distribution air guide hose; 211, three-way butt joint pipe; 212, public air guide hose; 213, external joint; 301, connecting cover; 302, anti-extinction heating wire; 303, fire guide isolation cover; 304, isolation plate; 305, fire-retardant net; 306, folded air guide cover; 307, smoke exhaust hole; 401, fire plugging snap ring; 402, fracture opening; 403, anti-slip tooth block; 404, actuating cylinder. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0023] Please refer to Figures 1-10The utility model provides a pressure pipeline welding preheating device, it includes: fixed mounting mechanism, the surface of fixed mounting mechanism active installation has gas -jet mechanism, the number of gas -jet mechanism is two, and two gas -jet mechanism is opposite distribution, and the side of two gas -jet mechanism away from fixed mounting mechanism is fixedly arranged with wind -proof guide mechanism, and the side of two wind -proof guide mechanisms away from gas -jet mechanism is provided with welding fire -blocking mechanism, and fixed mounting mechanism includes first lock -up ring 101 and second lock -up ring 102, and second lock -up ring 102 is rotatably connected in one end of first lock -up ring 101, and gas -jet mechanism includes curved sliding guide block 201 and air inlet guide cover 202, the number of curved sliding guide block 201 is two, and two second lock -up ring 102 are movably connected on the surface of first lock -up ring 101 and second lock -up ring 102, and air inlet guide cover 202 is fixedly connected on the surface of curved sliding guide block 201, and wind -proof guide mechanism includes connecting cover 301, anti -extinguishing hot -wire 302 and fire -guide cover 303, connecting cover 301 is fixedly connected on the surface of air inlet guide cover 202 end away from curved sliding guide block 201, anti -extinguishing hot -wire 302 is fixedly connected in connecting cover 301, and fire -guide cover 303 is fixedly connected on the side of connecting cover 301 away from air inlet guide cover 202, and welding fire -blocking mechanism includes fire -blocking snap ring 401, and fire -blocking snap ring 401 is movably arranged on the side of two fire -guide cover 303 away from connecting cover 301, through the fixed mounting mechanism, gas -jet mechanism, wind -proof guide mechanism and welding fire -blocking mechanism that set up, can effectively block external airflow interference through wind -proof guide structure when using, ensure that the flame is continuously combusted in the relatively stable environment, and simultaneously, with the internally arranged anti -extinguishing hot -wire 302, can realize instantaneous ignition and reignition when the flame is accidentally extinguished, to significantly improve the anti -interference ability and stability of flame.

[0024] Wherein: fixed mounting mechanism still includes first limit sliding rail 103 and first connecting lug 104, first limit sliding rail 103 is in -situ set up in the surface of first lock -up ring 101, and first connecting lug 104 is integrally arranged in the free end of first lock -up ring 101, and second lock -up ring 102 is opposite distribution with first lock -up ring 101.

[0025] Wherein: fixed mounting mechanism still includes second limit sliding rail 105 and second connecting lug 106, second limit sliding rail 105 is in -situ set up in the surface of second lock -up ring 102, and second connecting lug 106 is integrally arranged in the free end of second lock -up ring 102, and two curved sliding guide blocks 201 are slidably connected between second limit sliding rail 105 and first limit sliding rail 103.

[0026] The fixed mounting mechanism further comprises a threaded cylinder 107, a threaded locking column 108 and a twisting hand wheel 109. The threaded cylinder 107 is fixedly inserted into the interior of the first connecting lug 104. The threaded locking column 108 is threadedly connected to the interior of the threaded cylinder 107. When the threaded locking column 108 is connected to the threaded cylinder 107, the surface of the threaded locking column 108 is in sliding connection with the inner wall of the second connecting lug 106. The twisting hand wheel 109 is fixedly sleeved at one end of the threaded locking column 108. The first locking ring 101, the second locking ring 102, the first limiting sliding rail 103, the first connecting lug 104, the second limiting sliding rail 105, the second connecting lug 106, the threaded cylinder 107, the threaded locking column 108 and the twisting hand wheel 109 are arranged to fix the device to the surface of the pressure pipeline at a designated position during use, so that the device is stably preheated on the surface of the pressure pipeline.

[0027] The air-guiding and flame-spraying mechanism further comprises anti-slip strips 203 and anti-deviation tooth blocks 204. The anti-slip strips 203 are integrally arranged on the two sides of the two curved sliding guide blocks 201. The anti-deviation tooth blocks 204 are fixedly connected to the two ends of the two curved sliding guide blocks 201. Adjacent anti-deviation tooth blocks 204 are in meshing connection when the two curved sliding guide blocks 201 are installed.

[0028] The air-guiding and flame-spraying mechanism further comprises oxygen inlet waist holes 205, holding handles 206, anti-scald sleeves 207, distribution cavities 208 and jet heads 209. The oxygen inlet waist holes 205 are formed through the surface of the air inlet guide cover 202. The number of the oxygen inlet waist holes 205 is multiple, and the multiple oxygen inlet waist holes 205 are uniformly distributed. The holding handles 206 are fixedly connected to the surface of the air inlet guide cover 202. The anti-scald sleeves 207 are fixedly sleeved on the surface of the holding handles 206. The distribution cavities 208 are formed in the interior of the air inlet guide cover 202. The jet heads 209 are fixedly inserted into the inner surface of the air inlet guide cover 202. The jet heads 209 are in communication with the distribution cavities 208. The number of the jet heads 209 is multiple, and the multiple jet heads 209 are uniformly distributed. The oxygen inlet waist holes 205 are located on the outer side of the jet heads 209.

[0029] Wherein; the air guide fire mechanism further comprises two distribution air hoses 210, a three-way butt joint pipe 211, a common air hose 212 and an external joint 213, the two distribution air hoses 210 are fixedly connected to the surfaces of the two air inlet hoods 202 respectively, and the two distribution air hoses 210 are in communication with the two distribution cavities 208 respectively, the three-way butt joint pipe 211 is fixedly connected between the ends of the two distribution air hoses 210 away from the air inlet hoods 202, the common air hose 212 is fixedly connected to one end of the three-way butt joint pipe 211, and the external joint 213 is fixedly connected to the end of the common air hose 212 away from the three-way butt joint pipe 211, through the setting of the bending sliding guide block 201, the air inlet hood 202, the anti-slip strip 203, the anti-deviation tooth block 204, the oxygen inlet waist hole 205, the holding handle 206, the anti-scald sleeve 207, the distribution cavity 208, the air jet head 209, the distribution air hose 210, the three-way butt joint pipe 211, the common air hose 212 and the external joint 213, the combustible gas in the gas cylinder can be distributed and sprayed into the 202 during use, ensuring that the flame is evenly distributed on the surface of the pressure pipeline during preheating, and the air inlet hood 202 is convenient for disassembly and angle adjustment through the butt joint of the bending sliding guide block 201.

[0030] Wherein; the windproof and airflow guiding mechanism further comprises an isolation plate 304 and a flame-retardant net 305, the isolation plate 304 is integrally arranged on the inner wall of the connecting cover 301, and the inner diameter length of the isolation plate 304 is equal to the inner diameter length of the first locking ring 101, the flame-retardant net 305 is fixedly connected to the inside of the isolation plate 304, one end of the air jet head 209 extends to the other side of the isolation plate 304 through one side of the isolation plate 304, and the anti-extinguishing heating wire 302 and the oxygen inlet waist hole 205 are located on the two sides of the isolation plate 304 respectively.

[0031] Wherein; the windproof and airflow guiding mechanism further comprises a folding air cover 306 and a smoke exhaust hole 307, the folding air cover 306 is integrally arranged at the end of the fire guide cover 303 away from the connecting cover 301, and the smoke exhaust hole 307 is arranged on the surface of the fire guide cover 303 and located in the inside of the folding air cover 306, and the outer surface of the fire guide cover 303 is provided with a gas guiding inclined surface, through the setting of the connecting cover 301, the anti-extinguishing heating wire 302, the fire guide cover 303, the isolation plate 304, the flame-retardant net 305, the folding air cover 306 and the smoke exhaust hole 307, the flame can be isolated in the fire guide cover 303 to preheat the pressure pipeline during use, the oxygen flow is ensured while the flame is blocked from burning towards the air inlet hood 202 through the isolation plate 304 and the flame-retardant net 305, and the combustible gas can be re-ignited when the flame is extinguished by the anti-extinguishing heating wire 302, ensuring that the flame is re-ignited and improving the anti-interference effect.

[0032] Wherein, the welding fire blocking mechanism further comprises a fracture 402, an anti-skid tooth block 403 and a poking cylinder 404, the fracture 402 is provided through the surface of the fire blocking snap ring 401, when the fire blocking snap ring 401 is installed, the surface of the fire blocking snap ring 401 is attached to the surface of the folding gas guide cover 306, the anti-skid tooth block 403 is fixedly connected to the inside of the fire blocking snap ring 401, and the fire blocking snap ring 401 is an elastic snap ring, the number of the poking cylinders 404 is two, and the two fire blocking snap rings 401 are respectively fixedly inserted into the two ends of the fire blocking snap ring 401, through the fire blocking snap ring 401, the fracture 402, the anti-skid tooth block 403 and the poking cylinder 404, the fire blocking snap ring 401 can be used to close one end of the fire guide cover 303 when in use, so that the small flame can keep burning inside the fire guide cover 303, thereby reducing the heat loss of the pressure pipeline during welding and improving the welding effect.

[0033] Working principle: When in use, the external joint 213 is connected with the gas cylinder, the first locking ring 101 and the second locking ring 102 are unfolded, the two curved sliding blocks 201 are respectively slidably inserted into the first limiting slide rail 103 and the second limiting slide rail 105, so that the gas inlet guide cover 202 is connected with the first locking ring 101 and the second locking ring 102, the first locking ring 101 and the second locking ring 102 are sleeved on the surface of the pipeline at a specified position, then the threaded locking column 108 is inserted between the threaded cylinder 107 and the second connecting lug 106, the hand wheel 109 is twisted to make the threaded locking column 108 rotate, so that the second connecting lug 106 and the first connecting lug 104 are connected; Then the valve of the gas cylinder is opened, the combustible gas of the gas cylinder enters the three-way joint pipe 211 along the common gas guide hose 212, then enters the distribution cavity 208 through the distribution gas guide hose 210, and then is sprayed into the connecting cover 301 and the fire guide cover 303, and then is ignited from one side of the folding gas guide cover 306, so that the flame burns inside the folding gas guide cover 306, at the same time, due to the relatively high flow rate of the fluid inside the fire guide cover 303, a relative negative pressure is generated, so that oxygen is sucked into the gas inside through the oxygen inlet waist hole 205, and then enters the folding gas guide cover 306 through the fire-retardant mesh 305, so as to supplement oxygen to the flame inside the folding gas guide cover 306 and ensure the burning of the flame. When the flame burns, the isolation plate 304 and the fire-retardant mesh 305 isolate and retard the flame between the connecting cover 301 and the gas inlet guide cover 202, the flame flow is sprayed out from the gap between the fire guide cover 303 and the pipeline and preheats the pipeline, and the flame also heats the anti-extinguishing heating wire 302; When burning, the folding gas guide cover 306 wraps the flame to avoid being easily extinguished by air flow disturbance, if the flame is extinguished by disturbance, the heated anti-extinguishing heating wire 302 will re-ignite the gas, so as to ensure the continuous burning of the flame and keep the pipeline preheated. When welding, the fire blocking snap ring 401 can be clamped on the surface of the pipeline to block the output end of the folded air guide cover 306, reduce the fire output, so that the flame burns inside the folded air guide cover 306 and exhausts smoke from the smoke exhaust hole 307. At this time, the folded air guide cover 306 isolates and guides the hot air sprayed from the smoke exhaust hole 307, avoiding hot air from burning the welder around the welding area, thereby ensuring the heat of the pipeline during welding to be maintained, and avoiding its rapid cooling.

[0034] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are only by way of example and that modifications, changes, substitutions and alterations can be made thereto without departing from the spirit and scope of the application as defined by the appended claims and their equivalents.

Claims

1. A pressure pipe welding preheating device characterized by comprising: The utility model relates to a fixed installation mechanism, the surface of fixed installation mechanism is movably installed with air guide and spouts fire mechanism, the quantity of air guide and spouts fire mechanism is two, and two air guide and spouts fire mechanism oppositely distributes, and the side of two air guide and spouts fire mechanism away from fixed installation mechanism is fixedly arranged with windproof and flow guide mechanism, and the side of two windproof and flow guide mechanism away from air guide and spouts fire mechanism is provided with welding and plugs fire mechanism. The fixed installation mechanism comprises a first locking ring (101) and a second locking ring (102), the second locking ring (102) is rotatably connected to one end of the first locking ring (101), the air guide and spouts fire mechanism comprises a curved sliding guide block (201) and an air inlet guide cover (202), the number of the curved sliding guide block (201) is two, and the second locking ring (102) is movably connected to the surface of the first locking ring (101) and the second locking ring (102), the air inlet guide cover (202) is fixedly connected to the surface of the curved sliding guide block (201), the windproof and flow guide mechanism comprises a connecting cover (301), an anti-extinguishing heating wire (302) and a fire guide cover (303), the connecting cover (301) is fixedly connected to the surface of one end of the air inlet guide cover (202) away from the curved sliding guide block (201), the anti-extinguishing heating wire (302) is fixedly connected to the inside of the connecting cover (301), and the fire guide cover (303) is fixedly connected to the side of the connecting cover (301) away from the air inlet guide cover (202); the welding and plugs fire mechanism comprises a fire plug clasp (401), and the fire plug clasp (401) is movably arranged on the side of the fire guide cover (303) away from the connecting cover (301). The fixed installation mechanism further comprises a first limiting sliding rail (103) and a first connecting lug (104), the first limiting sliding rail (103) is embeddedly arranged on the surface of the first locking ring (101), and the first connecting lug (104) is integrally arranged on the free end of the first locking ring (101); the second locking ring (102) is oppositely arranged on the first locking ring (101).

2. A pressure pipe welding preheating device according to claim 1, characterized in that The fixed installation mechanism further comprises a second limiting sliding rail (105) and a second connecting lug (106), the second limiting sliding rail (105) is embeddedly arranged on the surface of the second locking ring (102), and the second connecting lug (106) is integrally arranged on the free end of the second locking ring (102); the curved sliding guide block (201) is slidably connected between the second limiting sliding rail (105) and the first limiting sliding rail (103).

3. A pressure pipe welding preheating device according to claim 2, characterized in that The fixed installation mechanism further comprises a threaded cylinder (107), a threaded lock column (108) and a twisting hand wheel (109), the threaded cylinder (107) is fixedly inserted into the inside of the first connecting lug (104), the threaded lock column (108) is threadedly connected to the inside of the threaded cylinder (107), the surface of the threaded lock column (108) is slidably connected with the inner wall of the second connecting lug (106) when the threaded lock column (108) is connected with the threaded cylinder (107), and the twisting hand wheel (109) is fixedly sleeved on one end of the threaded lock column (108).

4. A pressure pipe welding preheating device according to claim 3, characterized in that ​ 5. A pressure pipe welding preheating device according to claim 1, characterized in that, The air guide and fire spraying mechanism further comprises anti-slip strips (203) and anti-deviation tooth blocks (204), the anti-slip strips (203) are integrally arranged on the two sides of the two curved sliding guide blocks (201) respectively, and the anti-deviation tooth blocks (204) are fixedly connected at the two ends of the two curved sliding guide blocks (201), and the adjacent two anti-deviation tooth blocks (204) are engaged with each other when the two curved sliding guide blocks (201) are installed.

6. A pressure pipe welding preheating device according to claim 5, characterized in that The air guide and fire spraying mechanism further comprises oxygen inlet waist holes (205), holding handles (206), anti-scald sleeves (207), distribution cavities (208) and air jet heads (209), the oxygen inlet waist holes (205) are formed through the surface of the air inlet guide cover (202), the number of the oxygen inlet waist holes (205) is multiple, and the multiple oxygen inlet waist holes (205) are uniformly distributed, the holding handle (206) is fixedly connected to the surface of the air inlet guide cover (202), the anti-scald sleeve (207) is fixedly sleeved to the surface of the holding handle (206), the distribution cavity (208) is formed in the inside of the air inlet guide cover (202), the air jet head (209) is fixedly inserted to the inner surface of the air inlet guide cover (202), the air jet head (209) is in communication with the distribution cavity (208), the number of the air jet head (209) is multiple, the multiple air jet heads (209) are uniformly distributed, and the oxygen inlet waist holes (205) are located outside the air jet heads (209).

7. A pressure pipe welding preheating device according to claim 6, characterized in that The air guide and fire spraying mechanism further comprises distribution air guide hoses (210), three-way butt joint pipes (211), common air guide hoses (212) and external joints (213), the number of the distribution air guide hoses (210) is two, the two distribution air guide hoses (210) are fixedly connected to the surfaces of the two air inlet guide covers (202) respectively, and the two distribution air guide hoses (210) are in communication with the two distribution cavities (208) respectively, the three-way butt joint pipe (211) is fixedly connected between the ends of the two distribution air guide hoses (210) away from the air inlet guide covers (202), the common air guide hose (212) is fixedly connected to one end of the three-way butt joint pipe (211), and the external joint (213) is fixedly connected to the end of the common air guide hose (212) away from the three-way butt joint pipe (211).

8. A pressure pipe welding preheating device according to claim 6, characterized in that The windproof and airflow guiding mechanism further comprises an isolation plate (304) and a fire-retardant net (305), the isolation plate (304) is integrally arranged on the inner wall of the connecting cover (301), the inner diameter length of the isolation plate (304) is equal to the inner diameter length of the first locking ring (101), the fire-retardant net (305) is fixedly connected to the inside of the isolation plate (304), one end of the air jet head (209) penetrates through one side of the isolation plate (304) and extends to the other side of the isolation plate (304), and the anti-extinguishing heating wire (302) and the oxygen inlet waist holes (205) are located on the two sides of the isolation plate (304) respectively.

9. A pressure pipe welding preheating apparatus according to claim 8, wherein The windproof and airflow guiding mechanism further comprises a foldable airflow guide cover (306) and a smoke exhaust hole (307), the foldable airflow guide cover (306) is integrally arranged at one end of the fire guide cover (303) away from the connecting cover (301), the smoke exhaust hole (307) is arranged through the surface of the fire guide cover (303), the smoke exhaust hole (307) is located in the interior of the foldable airflow guide cover (306), and the outer surface of the fire guide cover (303) is provided with a gas exhaust inclined surface.

10. A pressure pipe welding preheating device according to claim 1, characterized in that The welding fire stopping mechanism further comprises a fracture (402), an anti-skid tooth block (403) and a poking cylinder (404), the fracture (402) is arranged through the surface of the fire stopping clasp (401), when the fire stopping clasp (401) is installed, the surface of the fire stopping clasp (401) is attached to the surface of the foldable airflow guide cover (306), the anti-skid tooth block (403) is fixedly connected to the interior of the fire stopping clasp (401), the fire stopping clasp (401) is an elastic clasp, the number of the poking cylinders (404) is two, and the two fire stopping clasps (401) are respectively fixedly inserted into two ends of the fire stopping clasp (401).

Images