Pressure test device for circumferential weld welding pipe and use method

Abstract

The invention belongs to the technical field of pipe performance testing devices, and provides a pressure testing device for a circumferential weld welding pipe and a using method. When the pressure test device is used for a pressure test, the pull rod piece, the guide piece, the first sealing piece and the second sealing piece are pushed by the transverse driving device to enter designated positions in the welding pipe. Meanwhile, the first sealing piece, the second sealing piece and the inner wall of the welding pipe are sealed, a pipe fitting circumferential welding seam of the welding pipe is located between the first sealing piece and the second sealing piece, the pressure medium is output through the pressure medium supply device and enters the welding pipe, and the pressure test process is achieved; the purpose of detecting the pressure bearing capacity of the welding seam and the pipe fitting of the welding pipe is achieved. The device is reasonable in structural design, meanwhile, assembly and disassembly automation can be achieved, and batched pressure test tasks of welded pipes can be completed.

Description

Technical Field

[0001] This invention belongs to the technical field of pipe performance testing devices, specifically relating to a pressure testing device and its usage method for circumferential welded pipes. Background Technology

[0002] In engineering projects, due to various reasons, it is necessary to weld two pipe sections together into a single pipe using a circumferential weld. To verify the strength, rigidity, and sealing performance of the weld and the entire pipe fitting, and to ensure the safety and reliability of the fitting, a pressure test is usually required. For high-precision pipe fittings, using welded seals will cause welding deformation and prevent the dimensional accuracy from meeting requirements. Therefore, mechanical seals are typically used for pressure testing.

[0003] Currently, the pressure test sealing device commonly used for circumferential welded pipe fittings adopts a method of tightening at both ends to achieve pressure sealing. This scheme relies on the external device of the device to provide the tightening force to resist the pressure of the medium on the sealing end cap during the pressure test.

[0004] The sealing method of welding sealing caps at both ends of the pipe fitting requires axial allowance to be reserved at both ends of the pipe fitting. After the pressure test, the allowance is removed by machining. Welding and cutting take a long time, the process is complicated, inefficient and costly. Moreover, welding can cause deformation of the pipe fitting, affecting the dimensional accuracy of the pipe fitting (such as inner and outer diameter dimensions).

[0005] Pressure testing using an externally tightened mechanical seal requires a large tooling platform and a complex tightening structure and related devices. The fabrication of the pressure testing device requires a lot of materials and time, resulting in high costs and long cycles for pipe pressure testing. Furthermore, the device occupies a large space, is inconvenient to hoist, and is difficult and time-consuming to assemble and disassemble, thus affecting production efficiency.

[0006] In addition, there is currently a lack of devices for fixing and adjusting the position of welded pipe fittings during testing, resulting in low adaptability and stability of the experimental process. Summary of the Invention

[0007] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of this invention is to provide a pressure testing device and a method of using it for circumferential welded pipes.

[0008] The technical solution adopted by this invention to solve its technical problem is: A pressure testing device for circumferential welded pipes includes a test platform, on which a welded pipe fixing device, a transverse driving device, and a pressure testing device are provided. The welding pipe fixing device is provided with a fixing part for fixing the welding pipe; The pressure testing device includes a pull rod, a guide, a first seal, a second seal, a first inflation connector assembly, a second inflation connector assembly, and a pressure medium supply device. The guide is disposed on the pull rod and the first inflation connector assembly. The two ends of the pull rod are respectively connected to the first seal and the second seal. The first inflation connector assembly is connected to the first seal, and the second inflation connector assembly is connected to the second seal. Both ends of the pull rod are provided with air outlets, and the air outlets are connected to the first inflation connector assembly and the second inflation connector assembly. One end of the first inflation connector assembly and the second inflation connector assembly is connected to the air supply end of the pressure medium supply device. The drive end of the lateral drive device is connected to the second inflatable connector assembly, and the drive end of the lateral drive device can drive the tie rod to move relative to the welded pipe fixing device through the second inflatable connector assembly.

[0009] Preferably, the first inflation connector assembly includes a first sealing plug, a first pipe connector, and a first sealing ring. One end of the first sealing plug is connected to one end of the first pipe connector, and the other end of the first sealing plug is connected to one end of the pull rod. The guide is sleeved on the first pipe connector, and the other end of the first pipe connector is connected to the air supply end of the pressure medium supply device. The outer wall surface of the first sealing plug is provided with a plurality of first mounting grooves for placing the first sealing ring. One end of the first sealing plug is provided with a first connecting channel, and the other end of the first sealing plug is provided with a first mating groove. The first connecting channel is connected to the first mating groove. The first mating groove is mated with one end of the pull rod. One end of the pull rod is provided with a first venting channel. One port of the first venting channel is connected to the first connecting channel, and the other port of the first venting channel is located on the outer wall surface of the pull rod and is outside the first mating groove.

[0010] Preferably, the second inflation connector assembly includes a second sealing plug, a second connector, a second connecting sleeve, and a second sealing ring. One end of the second sealing plug is connected to the other end of the pull rod, and the other end of the second sealing plug is connected to the second connector. The second connecting sleeve is connected to the second connector and to the drive end of the lateral drive device. The outer wall surface of the second sealing plug is provided with a plurality of second mounting grooves for placing the second sealing ring. The second sealing plug is connected to the air supply end of the pressure medium supply device.

[0011] Preferably, the top of the outer wall of the second sealing plug is provided with a second pipe joint, one end of the second sealing plug is provided with a second mating groove, the other end of the first sealing plug is provided with a second connecting channel, the second connecting channel is connected to the second mating groove, the second mating groove is mated with the other end of the pull rod, the other end of the pull rod is provided with a second venting channel, one port of the second venting channel is connected to one port of the second connecting channel, the other port of the second venting channel is located on the outer wall of the pull rod and is outside the second mating groove, and the other port of the second connecting channel is connected to the second pipe joint.

[0012] Preferably, the bottom of the outer wall surface of the second sealing plug is provided with a guide roller assembly, which abuts against the platform surface of the test platform.

[0013] Preferably, the guide member is cylindrical in shape, one end of the guide member is provided with an annular guide section, and the guide member is provided with a plurality of flow holes.

[0014] Preferably, the welded pipe fixing device includes a fixing base, a fixing platform, a displacement driving device, a fixing pressure plate, and a pressure plate adjusting mechanism for adjusting the position of the fixing pressure plate. The displacement driving device and the pressure plate adjusting mechanism are disposed on the fixing base. The fixing platform is connected to the driving end of the displacement driving device. The driving end of the pressure plate adjusting mechanism is connected to the fixing pressure plate. The fixing part is formed between the fixing pressure plate and the fixing platform.

[0015] Preferably, the pressure plate adjusting mechanism includes a first rotary motor, a first coupling, a first lead screw, a track rod, a first lead screw fixing seat, a first slider, and a first fixing block. The drive end of the first rotary motor is connected to the first lead screw via the first coupling. The first fixing block is connected to both the first lead screw fixing seat and the first rotary motor. The first slider is provided with a first threaded sleeve that is threadedly engaged with the first lead screw. The first threaded sleeve is rotatably engaged with the first slider. One end of the first lead screw is rotatably engaged with the first lead screw fixing seat. The track rod is connected to both the first lead screw fixing seat and the first fixing block. The first slider is provided with a roller that is slidably engaged with the track rod. The first rotary motor, the first lead screw fixing seat, and the first fixing block are connected to the fixing seat body. The fixed pressure plate is connected to the first slider. The fixing seat body is provided with a clearance for the fixed pressure plate to pass through and move.

[0016] Preferably, there are two pressure plate adjustment mechanisms, which are respectively located on both sides of the fixed base.

[0017] The present invention also includes a method of using a pressure testing device for circumferential welded pipes, applied to the aforementioned pressure testing device for circumferential welded pipes, the steps of which are as follows: S1. Fix the welded pipe at the welded pipe fixing device and adjust the height distance of the welded pipe relative to the test platform so that the axis of the welded pipe is aligned with the axis of the tie rod. S2. The drive end of the lateral drive device is in the retracted state, and the air supply end of the pressure medium supply device is in the disconnected state. S3. Install the first sealing ring and the second sealing ring onto the first sealing plug and the second sealing plug respectively, and apply grease to the first sealing ring and the second sealing ring. S4. Start the lateral drive device to move the tie rod and guide into the inside of the welded pipe, and then stop the lateral drive device. S5. Connect the air supply end of the pressure medium supply device to the first air inflator assembly and the second air inflator assembly. S6. Start the pressure medium supply device, confirm the medium flow, increase the pressure, and conduct a pressure test. S7. After the pressure test is completed, reduce the pressure to atmospheric pressure; S8. Release the connection between the air supply end of the pressure medium supply device and the first air inlet assembly and the second air inlet assembly. S9. Start the lateral drive device to move the tie rod and guide parts out of the inside of the welded pipe, and then stop the lateral drive device. S10. Replace the first and second sealing rings as needed, and prepare for the next round of pressure testing.

[0018] Compared with the prior art, the beneficial effects of the present invention include: In this pressure testing apparatus, during pressure testing, the tie rod, guide, first seal, and second seal are pushed into designated positions inside the welded pipe by a lateral drive device. Simultaneously, the first and second seals form a seal with the inner wall of the welded pipe, positioning the circumferential weld seam between the first and second seals. Pressure medium is supplied through a pressure medium supply device and enters the welded pipe, thus completing the pressure testing process and verifying the pressure-bearing capacity of the weld seam and the welded pipe fittings. This invention features a rationally designed structure and automated assembly and disassembly, enabling batch pressure testing of welded pipes. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the present invention.

[0021] Figure 2 This is a schematic diagram showing the cooperation between the pressure testing device of the present invention and the welded pipe.

[0022] Figure 3 This is a front view of the pressure plate adjustment mechanism of the present invention.

[0023] Figure 4 This is a perspective view of the pressure plate adjustment mechanism of the present invention.

[0024] in: 1-Test platform; 2- Lateral drive device; 3-Pressure testing device, 301-Tie rod, 3011-First ventilation channel, 3012-Second ventilation channel, 302-Guide, 303-First sealing plug, 3031-First connecting channel, 3032-First mating groove, 304-First pipe joint, 305-First sealing ring, 306-Second sealing plug, 3061-Second mating groove, 3062-Second connecting channel, 307-Second connector, 308-Second connecting sleeve, 309-Second sealing ring, 310-Second pipe joint; 4-Welded pipe fixing device, 41-Fixed seat, 42-Pressure plate adjusting mechanism, 4206-Fixed pressure plate, 4207-First rotating motor, 4208-First coupling, 4209-First lead screw, 4210-Rail rod, 4211-First lead screw fixing seat, 4212-First slider, 4213-First threaded sleeve, 4214-Roller, 4215-First fixing block, 43-Fixed platform, 44-Displacement driving device; 5-Guide roller assembly; 6-Welded pipe. Detailed Implementation

[0025] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. Many specific details are set forth in the following description to provide a thorough understanding of the present invention; the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0027] Example: like Figure 1-4 As shown, this embodiment provides a pressure testing device for circumferential welded pipes, including a test platform 1, on which a welded pipe fixing device 4, a transverse driving device 2 and a pressure testing device 3 are provided; The welded pipe fixing device 4 is provided with a fixing part for fixing the welded pipe 6; The pressure testing device 3 includes a pull rod 301, a guide 302, a first seal, a second seal, a first inflation connector assembly, a second inflation connector assembly, and a pressure medium supply device. The guide 302 is disposed on the pull rod 301 and the first inflation connector assembly. The two ends of the pull rod 301 are respectively connected to the first seal and the second seal. The first inflation connector assembly is connected to the first seal, and the second inflation connector assembly is connected to the second seal. The two ends of the pull rod 301 are provided with air outlets, and the air outlets are connected to the first inflation connector assembly and the second inflation connector assembly. One end of the first inflation connector assembly and the second inflation connector assembly is connected to the air supply end of the pressure medium supply device. The drive end of the lateral drive device 2 is connected to the second air inflator assembly. The drive end of the lateral drive device 2 can drive the tie rod 301 to move relative to the welded pipe fixing device 4 through the second air inflator assembly.

[0028] In this embodiment, during pressure testing, the pressure testing device 3, with its tie rod 301, guide 302, first seal, and second seal, enters a designated position inside the welded pipe under the push of the transverse drive device 2. Simultaneously, the first and second seals form a seal with the inner wall of the welded pipe, positioning the circumferential weld seam between the first and second seals. Pressure medium is output through the pressure medium supply device and enters the welded pipe, thus completing the pressure testing process and verifying the pressure-bearing capacity of the weld seam and the welded pipe fittings. This invention features a rationally designed structure and automated assembly and disassembly, enabling batch pressure testing of welded pipes.

[0029] The specific structure of the first inflation connector assembly in this embodiment is as follows: It includes a first sealing plug 303, a first pipe joint 304, and a first sealing ring 305. One end of the first sealing plug 303 is connected to one end of the first pipe joint 304, and the other end of the first sealing plug 303 is connected to one end of the pull rod 301. A guide 302 is sleeved on the first pipe joint 304, and the other end of the first pipe joint 304 is connected to the air supply end of the pressure medium supply device. The outer wall surface of the first sealing plug 303 is provided with a plurality of first mounting grooves for placing the first sealing ring 305. One end of the first sealing plug 303 is provided with a first connecting channel 3031, and the other end of the first sealing plug 303 is provided with a first mating groove 3032. The first connecting channel 3031 and the first mating groove 3032 are connected. The first mating groove 3032 is mated with one end of the pull rod 301. One end of the pull rod 301 is provided with a first ventilation channel 3011. One end of the first ventilation channel 3011 is connected to the first connecting channel 3031, and the other end of the first ventilation channel 3011 is located on the outer wall surface of the pull rod 301 and is outside the first mating groove 3032.

[0030] The specific structure of the second inflation connector assembly in this embodiment is as follows: It includes a second sealing plug 306, a second connector 307, a second connecting sleeve 308, and a second sealing ring 309. One end of the second sealing plug 306 is connected to the other end of the pull rod 301, and the other end of the second sealing plug 306 is connected to the second connector 307. The second connecting sleeve 308 is connected to the second connector 307 and to the drive end of the transverse drive device 2. The outer wall surface of the second sealing plug 306 is provided with several second mounting grooves for placing the second sealing ring 309. The second sealing plug 306 is connected to the air supply end of the pressure medium supply device.

[0031] Specifically, the top of the outer wall of the second sealing plug 306 is provided with a second pipe joint 310, one end of the second sealing plug 306 is provided with a second mating groove 3061, the other end of the first sealing plug 303 is provided with a second connecting channel 3062, the second connecting channel 3062 is connected to the second mating groove 3061, the second mating groove 3061 is mated with the other end of the pull rod 301, the other end of the pull rod 301 is provided with a second venting channel 3012, one end of the second venting channel 3012 is connected to one end of the second connecting channel 3062, the other end of the second venting channel 3012 is located on the outer wall of the pull rod 301 and is outside the second mating groove 3061, and the other end of the second connecting channel 3062 is connected to the second pipe joint 310.

[0032] In the above structure, the connection between the two ends of the pull rod 301 and the first seal and the second seal is as follows: the two ends of the pull rod 301 are threaded to the first mating groove 3032 of the first sealing plug 303 and the second mating groove 3061 of the second sealing plug 306, and the external contact position is welded into a weld. The threaded connection can ensure the structural strength, and the welded connection can ensure the connection sealing.

[0033] The first ventilation channel 3011 and the second ventilation channel 3012 at both ends of the tie rod 301 have axial channels and radial channels, which serve as channels for the pressure test medium to reach the inside of the pipe.

[0034] The first seal, the second seal, the first inflation connector assembly, and the second inflation connector assembly are connected to the pressure medium supply device. The internal channels are used for the entry and exit of the test medium, thus forming the entire pressure test medium flow loop to ensure good flow of the medium.

[0035] The second connecting sleeve 308 and the second connecting head 307 are connected by a threaded connection to ensure the stability of the connection with the transverse drive device 2.

[0036] In this embodiment, the lateral drive device 2 is a hydraulic cylinder drive device. The push rod of the hydraulic cylinder drive device extends or retracts, pushing the pull rod 301 to move linearly back and forth, thereby realizing the automated installation and disassembly of the device.

[0037] Meanwhile, a guide roller assembly 5 is provided at the bottom of the outer wall of the second sealing plug 306, and the guide roller assembly 5 abuts against the platform surface of the test platform 1. The guide roller assembly 5 specifically includes a connecting rod and a guide wheel. This structure can ensure the stability of the tie rod 301 during movement, play a supporting role, and prevent the tie rod 301 from being excessively deformed under the weight of the guide 302, the first seal, and the second seal.

[0038] In this embodiment, the guide member 302 is cylindrical in shape, one end of the guide member 302 is provided with an annular guide section, and the guide member 302 is provided with a plurality of flow holes.

[0039] The guide component 302 plays a guiding role during the installation and removal of the tie rod 301, the first seal, and the second seal, assisting the above devices in correct alignment and installation, preventing excessive angular deflection that could cause difficulties in assembly and disassembly. At the same time, the guide component 302 is made of soft material, which provides a buffering and protective function to prevent damage to the welded pipe. In addition, the guide section at one end of the guide component 302 makes that end a tapered structure, which facilitates installation guidance and also facilitates the installation of the first sealing ring 305 and the second sealing ring 309. The flow hole on the guide component 302 allows the test medium to flow through.

[0040] After pressurization, theoretically the pressure of the pressure medium on the first sealing plug 303 and the second sealing plug 306 is equal and opposite in direction. The pressure cancels each other out, and the welded pipe fittings and the entire pressure test device 3 are in a state of force balance and stable static state. No additional device is needed to apply external force to resist the pressure.

[0041] Meanwhile, the specific structure of the welded pipe fixing device 4 in this embodiment is as follows: It includes a fixed base 41, a fixed platform 43, a displacement driving device 44, a fixed pressure plate 4206, and a pressure plate adjusting mechanism 42 for adjusting the position of the fixed pressure plate 4206. The displacement driving device 44 and the pressure plate adjusting mechanism 42 are located on the fixed base 41. The fixed platform 43 is connected to the driving end of the displacement driving device 44. The driving end of the pressure plate adjusting mechanism 42 is connected to the fixed pressure plate 4206. A fixed part is formed between the fixed pressure plate 4206 and the fixed platform 43.

[0042] Specifically, the pressure plate adjusting mechanism 42 includes a first rotary motor 4207, a first coupling 4208, a first lead screw 4209, a track rod 4210, a first lead screw fixing seat 4211, a first slider 4212, and a first fixing block 4215. The drive end of the first rotary motor 4207 is connected to the first lead screw 4209 via the first coupling. The first fixing block 4215 is connected to both the first lead screw fixing seat 4211 and the first rotary motor 4207. The first slider 4212 is provided with a first threaded sleeve 4213 that is threadedly engaged with the first lead screw 4209. The first threaded sleeve 4213 is connected to the first lead screw 4209. The slider 4212 is rotatably engaged, one end of the first lead screw 4209 is rotatably engaged with the first lead screw fixing seat 4211, the track rod 4210 is connected to the first lead screw fixing seat 4211 and the first fixing block 4215 respectively, the first slider 4212 is provided with a roller 4214 that is slidably engaged with the track rod 4210, the first rotating motor 4207, the first lead screw fixing seat 4211, the first fixing block 4215 are connected to the fixing seat body 41, the fixing pressure plate 4206 is connected to the first slider 4212, and the fixing seat body 41 is provided with a clearance for the fixing pressure plate 4206 to pass through and move.

[0043] Specifically, there are two pressure plate adjustment mechanisms 42, which are respectively located on both sides of the fixed base 41.

[0044] Based on the structure of the welded pipe fixing device 4 described above, the following effects can be achieved: The welded pipe can be fixed. The welded pipe is first placed on the fixed platform 43, and then the fixed pressure plate 4206 is pressed by the pressure plate adjustment mechanism 42 to fix the welded pipe, thereby ensuring the stability of the position of the welded pipe during the test and ensuring the stability of the pressure test.

[0045] In the pressure plate adjusting mechanism 42, the first rotating motor 4207 drives the first lead screw 4209 to rotate through the first coupling 4208. The first lead screw 4209 moves through the first threaded sleeve 4213, causing the first slider 4212 to move relative to the first lead screw 4209. Specifically, the rotational engagement structure between the first threaded sleeve 4213 and the first slider 4212 is connected by bearing components. In order to ensure the stability of the movement of the first slider 4212, a track rod 4210 and a roller component 4214 are provided, which can ensure the stability of the pressure plate adjusting mechanism 42 in the process of pressing the welded pipe by fixing the pressure plate 4206.

[0046] The position of the welded pipe relative to the test platform 1 can also be moved. According to the requirements of testing different welded pipe sizes, the axis position of the welded pipe needs to be aligned with the axis position of the tie rod 301. Therefore, the displacement drive device 44 can adjust the position of the fixed platform 43 to realize the adjustment of the position of the welded pipe relative to the test platform.

[0047] The pressure medium supply device in this embodiment can supply gas or liquid as the pressure medium.

[0048] The present invention also includes a method of using a pressure testing device 3 for circumferential welded pipes. The method of using the pressure testing device 3 for circumferential welded pipes described above includes the following steps: S1. Fix the welded pipe to the welded pipe fixing device 4 and adjust the height distance of the welded pipe relative to the test platform 1 so that the axis of the welded pipe is aligned with the axis of the tie rod 301. S2. The drive end of the transverse drive device 2 is in the retracted state, and the air supply end of the pressure medium supply device is in the disconnected state. S3. Install the first sealing ring 305 and the second sealing ring 309 onto the first sealing plug 303 and the second sealing plug 306 respectively, and apply grease to the first sealing ring 305 and the second sealing ring 309. S4. Start the transverse drive device 2 to bring the tie rod 301 and guide 302 into the inside of the welded pipe, and then stop the transverse drive device 2. S5. Connect the air supply end of the pressure medium supply device to the first air inflator assembly and the second air inflator assembly. S6. Start the pressure medium supply device, confirm the medium flow, increase the pressure, and conduct a pressure test. S7. After the pressure test is completed, reduce the pressure to atmospheric pressure; S8. Release the connection between the air supply end of the pressure medium supply device and the first air inlet assembly and the second air inlet assembly. S9. Start the transverse drive device 2 to move the tie rod 301 and guide 302 out of the inside of the welded pipe, and then stop the transverse drive device 2. S10. Replace the first sealing ring 305 and the second sealing ring 309 as needed, and prepare for the next round of pressure test.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A pressure testing device for girth weld pipe, characterized by, The test platform is provided with a welded pipe fixing device, a transverse driving device and a pressure test device; The welded pipe fixing device is provided with a fixing part for fixing the welded pipe; The pressure test device comprises a pull rod, a guide, a first sealing part, a second sealing part, a first inflation joint assembly, a second inflation joint assembly and a pressure medium supply device, the guide is arranged on the pull rod and the first inflation joint assembly, the two ends of the pull rod are connected with the first sealing part and the second sealing part respectively, the first inflation joint assembly is connected with the first sealing part, the second inflation joint assembly is connected with the second sealing part, the two ends of the pull rod are provided with gas outlets, the gas outlets are in communication with the first inflation joint assembly and the second inflation joint assembly, and one end of the first inflation joint assembly and the second inflation joint assembly is connected with a gas supply end of the pressure medium supply device; The driving end of the transverse driving device is connected with the second inflation joint assembly, and the driving end of the transverse driving device can drive the pull rod to move relative to the welded pipe fixing device through the second inflation joint assembly.

2. The ring weld pressure testing apparatus for welded pipes according to claim 1, wherein The first inflation joint assembly comprises a first sealing plug, a first pipe joint and a first sealing ring, one end of the first sealing plug is in communication with one end of the first pipe joint, the other end of the first sealing plug is in communication with one end of the pull rod, the guide is sleeved on the first pipe joint, the other end of the first pipe joint is connected with the gas supply end of the pressure medium supply device, and the outer wall surface of the first sealing plug is provided with a plurality of first installation grooves for placing the first sealing ring; One end of the first sealing plug is provided with a first communication channel, the other end of the first sealing plug is provided with a first matching groove, the first communication channel is in communication with the first matching groove, the first matching groove is matched with one end of the pull rod, one end of the pull rod is provided with a first air passage, one end of the first air passage is in communication with the first communication channel, and the other end of the first air passage is arranged on the outer wall surface of the pull rod and located outside the first matching groove.

3. The ring weld pressure testing apparatus of claim 1, wherein, The second inflation joint assembly comprises a second sealing plug, a second connecting head, a second connecting sleeve and a second sealing ring, one end of the second sealing plug is in communication with the other end of the pull rod, the other end of the second sealing plug is connected with the second connecting head, the second connecting sleeve is connected with the second connecting head, the second connecting sleeve is connected with the driving end of the transverse driving device, the outer wall surface of the second sealing plug is provided with a plurality of second installation grooves for placing the second sealing ring, and the second sealing plug is connected with the gas supply end of the pressure medium supply device.

4. The ring weld pressure testing apparatus of claim 3, wherein, The top of the outer wall surface of the second sealing plug is provided with a second pipe joint, one end of the second sealing plug is provided with a second matching groove, the other end of the first sealing plug is provided with a second communication channel, the second communication channel is in communication with the second matching groove, the second matching groove is matched with the other end of the pull rod, the other end of the pull rod is provided with a second ventilation channel, one end of the second ventilation channel is in communication with one end of the second communication channel, the other end of the second ventilation channel is provided on the outer wall surface of the pull rod and is located outside the second matching groove, and the other end of the second communication channel is in communication with the second pipe joint.

5. The ring weld pressure testing apparatus of claim 3, wherein, The bottom of the outer wall surface of the second sealing plug is provided with a guide roller assembly, and the guide roller assembly abuts against the platform surface of the test platform.

6. The ring weld pressure testing apparatus of claim 1, wherein, The guide piece is in a cylindrical shape, one end of the guide piece is provided with a ring-shaped guide cutting surface part, and a plurality of flow-through holes are arranged on the guide piece.

7. The ring weld pressure testing apparatus of claim 1, wherein, The welding pipe fixing device comprises a fixing seat body, a fixing platform, a displacement driving device, a fixing pressing plate and a pressing plate adjusting mechanism for adjusting the position of the fixing pressing plate, the displacement driving device and the pressing plate adjusting mechanism are arranged in the fixing seat body, the fixing platform is connected with the driving end of the displacement driving device, the driving end of the pressing plate adjusting mechanism is connected with the fixing pressing plate, and the fixing part is formed between the fixing pressing plate and the fixing platform.

8. The ring weld pressure testing apparatus of claim 7, wherein, The pressing plate adjusting mechanism comprises a first rotating motor, a first coupling, a first screw rod, a track rod, a first screw rod fixing seat, a first sliding block and a first fixing block, the driving end of the first rotating motor is connected with the first screw rod through the first coupling, the first fixing block is connected with the first screw rod fixing seat and the first rotating motor respectively, a first threaded sleeve threadedly matched with the first screw rod is arranged on the first sliding block, the first threaded sleeve is rotationally matched with the first sliding block, one end of the first screw rod is rotationally matched with the first screw rod fixing seat, the track rod is connected with the first screw rod fixing seat and the first fixing block respectively, a roller matched with the track rod is arranged on the first sliding block, the first rotating motor, the first screw rod fixing seat, the first fixing block and the fixing seat body are connected, the fixing pressing plate is connected with the first sliding block, and a clearance for the fixing pressing plate to pass through and move is arranged on the fixing seat body.

9. The ring weld pressure testing apparatus of claim 8, wherein, The number of the pressing plate adjusting mechanisms is two and they are arranged on the two sides of the fixing seat body respectively.

10. A method of using a pressure testing apparatus for girth weld welded pipes, c h a r a c t e r i s e d in that The pressure test device for the girth weld welding pipe of any one of the above claims 1-9 is used, and the steps of the use method are as follows: S1, fixing the welding pipe at the welding pipe fixing device, and adjusting the height distance of the welding pipe relative to the test platform, so that the axis of the welding pipe is aligned with the axis of the pull rod; S2, the driving end of the transverse driving device is in a retracted state, and the gas supply end of the pressure medium supply device is in a disconnected state; S3, the first sealing ring and the second sealing ring are respectively installed on the first sealing plug and the second sealing plug, and lubricating grease is applied on the first sealing ring and the second sealing ring. S4, start the lateral driving device, and then the pull rod and the guide are moved into the inside of the welded pipe, and then the lateral driving device is stopped; S5, the gas supply end of the pressure medium supply device is connected with the first inflation joint assembly and the second inflation joint assembly; S6, the pressure medium supply device is started, and the pressure is increased after the medium flow is confirmed, and the pressure test is performed; S7, after the pressure test is completed, the pressure is reduced to normal pressure; S8, the state that the gas supply end of the pressure medium supply device is connected with the first inflation joint assembly and the second inflation joint assembly is released; S9, the lateral driving device is started, and then the pull rod and the guide are moved out of the inside of the welded pipe, and then the lateral driving device is stopped; S10, the first sealing ring and the second sealing ring are replaced according to the need, and the next round of pressure test is prepared.

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