Large-diameter, ultra-long stroke plug with mechanical locking

Abstract

This large-diameter, ultra-long-stroke plugging device with mechanical locking comprises a lifting lug, cylinder head flange, guide flange, cylinder liner protective ring, piston rod, outer sleeve, directional rod, guide copper sleeve, base, connecting flange, and locking mechanism. The piston rod has a hollow structure with a cylinder liner protective ring at its front end. One end of the piston rod slides into the outer sleeve, while the other end engages with the guide copper sleeve. The guide copper sleeve connects sequentially to the base and outer sleeve. A locking mechanism, consisting of a locking shaft copper sleeve and a locking shaft screw, is located in the middle of the base and the connecting flange. This invention features a cylinder liner protective ring at the front end of the piston rod and locking shaft copper sleeves in the base and connecting flange, allowing for piston rod positioning adjustment and mechanical locking. This not only enables better application of the plugging device in large-diameter pipeline plugging operations but also provides greater safety, stability, and reliability for long-term continuous pipeline plugging operations due to the mechanical locking structure.

Description

Technical Field

[0001] This utility model relates to the technical field of pipeline repair and sealing equipment, specifically to a large-diameter, ultra-long-stroke sealing device with a mechanical lock. Background Technology

[0002] With the rapid development of the national economy in recent years, China's energy sector has entered a new stage of high-quality development. The importance of the energy engineering industry, as a cornerstone of the national economy, is self-evident. In recent years, the specifications of long-distance energy transmission pipelines have increased year by year. After several years of service, pipelines are susceptible to damage from long-term factors such as foundation settlement, corrosion, and external construction activities, necessitating pipeline maintenance and emergency repairs. Currently, for defects such as damage or leakage in energy transmission pipelines and process pipelines, according to the national standard "Guidelines for Repairing Defects in Buried Steel Pipelines," pressurized tapping and plugging is recommended as the preferred permanent repair method. For the live tapping and plugging process, which involves continuous pipeline operation, the plugging device is one of the key pieces of equipment in the process. Its safety, stability, and efficiency directly affect the advancement and innovation of the entire process.

[0003] The pressurized tapping and plugging process consists of three main steps: tapping, plugging, and sealing. The plugging step primarily utilizes a plugging device. The plug head is inserted into the pipe through a tapping hole and placed inside to cut off and block the internal medium, facilitating subsequent replacement of intermediate pipe sections. However, as the pipe diameter increases, the size of the plug head also increases, requiring an increase in the weight of the plug head and the stroke of the plugging device. When the pipe size increases to a certain size (DN1000 and above), traditional plugging device structures become unsuitable for current working conditions. Utility Model Content

[0004] This invention provides a large-diameter, ultra-long-stroke plugging device with a mechanical lock to solve the problem that existing plugging devices cannot be used in plugging processes involving large-diameter pipelines or excessively long lowering strokes of the plugging head.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A large-diameter, ultra-long-stroke mechanically locked plugging device comprises a lifting lug, a cylinder head flange, a guide flange, a cylinder liner protective ring, a piston rod, an outer sleeve, a directional rod, a guide copper sleeve, a base, a connecting flange, and a locking mechanism. The lifting lug is connected to the cylinder head flange by welding, and the cylinder head flange is connected to the outer sleeve by bolts. A cylinder liner protective ring is provided at the front end of the piston rod. The piston rod has a hollow structure, with one end slidingly engaging with the outer sleeve and the other end engaging with the guide copper sleeve. The guide copper sleeve engages with the directional rod and is connected to the base and the outer sleeve in sequence. A locking mechanism with the same structure is provided in the middle of the base and the middle of the connecting flange. The locking mechanism consists of a locking shaft copper sleeve and a locking shaft screw. The locking shaft copper sleeve is embedded inside the base and the connecting flange. An L-shaped notch is provided on the annular body of the locking shaft copper sleeve, and a screw hole is provided on one side of the L-shaped notch. The connecting flange, the outer sleeve, and the base are fixedly connected by bolts.

[0007] A sealing O-ring is installed between the cylinder head flange and the outer sleeve.

[0008] The cylinder liner protection ring is made of tin bronze; the locking shaft copper bushing is also made of tin bronze.

[0009] The piston rod is equipped with a double-layer YX sealing ring and a double-layer wear-resistant strip.

[0010] A YX sealing ring is installed between the piston rod and the guide copper sleeve.

[0011] A sealing O-ring is provided between the guide copper sleeve and the base, and a sealing O-ring is provided between the guide copper sleeve and the outer sleeve.

[0012] The aforementioned connecting flange is equipped with a YX sealing ring and a dustproof ring inside.

[0013] The above-mentioned connecting flange is provided with a stop on the outside, and the size of the stop is matched with the matching assemblies.

[0014] The aforementioned guide copper sleeve is made of ductile iron, and the inside of the guide copper sleeve has a hexagonal structure. The directional rod is made of standard hexagonal steel profile.

[0015] The aforementioned locking screw has a T-shaped structure.

[0016] When using this utility model device, first connect the matching plugging assembly, cutter head, center drill and plugging device according to the construction requirements. Then install the plugging assembly onto the valve that has been installed on the pipeline (the valve is installed on the plugging fitting, the plugging fitting is welded to the pipeline and the previous hole opening process has been completed). Open the pressure balance and then the plugging operation can be carried out. After the plugging head is lowered to the predetermined position, the mechanical lock is achieved by tightening the locking shaft screw. Then the subsequent process can be carried out. The locking shaft copper sleeve in the base and the connecting flange are used for piston rod positioning adjustment and mechanical locking shaft, respectively. The locking shaft copper sleeve is embedded in the base and the connecting flange. The tightness can be adjusted by rotating the locking shaft screw.

[0017] This invention features a cylinder liner protection ring at the front end of the piston rod in a traditional plugging device, and locking copper sleeves in the base and connecting flange, which can be used for piston rod positioning adjustment and mechanical locking. This not only allows the plugging device to be better applied to large-diameter pipeline plugging operations, but also makes the mechanical locking structure safer, more stable and reliable for long-term continuous pipeline plugging operations. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a front view schematic diagram of the device of this utility model;

[0020] Figure 2 This is a side view of the device of this utility model;

[0021] Figure 3 A front view of the locking shaft copper sleeve of this utility model device;

[0022] Figure 4 This is a front view schematic diagram of the locking screw of the device of this utility model;

[0023] In the diagram, 1 is the lifting lug, 2 is the cylinder head flange, 3 is the guide flange, 4 is the cylinder liner protection ring, 5 is the piston rod, 6 is the outer sleeve, 7 is the guide rod, 8 is the guide copper sleeve, 9 is the base, 10 is the connecting flange, 11 is the locking shaft copper sleeve, 12 is the locking shaft screw, 13 is the L-shaped notch, and 14 is the screw hole. Detailed Implementation

[0024] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, a large-diameter, ultra-long stroke plugging device with a mechanical lock comprises a lifting lug 1, a cylinder head flange 2, a guide flange 3, a cylinder liner protective ring 4, a piston rod 5, an outer sleeve 6, a directional rod 7, a guide copper sleeve 8, a base 9, a connecting flange 10, and a locking mechanism. The lifting lug 1 is connected to the cylinder head flange 2 by welding, and the cylinder head flange 2 is connected to the outer sleeve 6 by bolts. The piston rod 5 has a cylinder liner protective ring 4 at its front end and a hollow structure. One end of the piston rod 5 slides with the outer sleeve 6, and the other end of the piston rod 5 is connected to the guide copper sleeve. The guide copper sleeve 8 mates with the directional rod 7. The guide copper sleeve 8 is connected to the base 9 and the outer sleeve 6 in sequence. A locking mechanism with the same structure is set in the middle of the base 9 and the middle of the connecting flange 10. The locking mechanism consists of a locking shaft copper sleeve 11 and a locking shaft screw 12. The locking shaft copper sleeve 11 is embedded inside the base 9 and the connecting flange 10. An L-shaped notch 13 is opened on the annular body of the locking shaft copper sleeve 11, and a screw hole 14 is set on one side of the L-shaped notch 13. The connecting flange 10, the outer sleeve 6, and the base 9 are fixedly connected by bolts. A sealing O-ring is set between the cylinder head flange and the outer sleeve. The cylinder liner protective ring 4 is made of tin bronze; the locking shaft copper sleeve 11 is made of tin bronze. The piston rod 5 is equipped with a double-layer YX sealing ring and a double-layer wear-resistant strip. A YX sealing ring is set between the piston rod 5 and the guide copper sleeve 8. A sealing O-ring is set between the guide copper sleeve 8 and the base 9, and between the guide copper sleeve 8 and the outer sleeve 6. A YX sealing ring and a dustproof ring are set inside the connecting flange 10. A stop is provided on the outer side of the connecting flange 10, and the size of the stop matches the matching assemblies. The guide copper sleeve is made of ductile iron, and the interior of the guide copper sleeve has a hexagonal structure. The guide rod is made of standard hexagonal steel profile. The locking screw 12 has a T-shaped structure.

[0025] When using this utility model device, first connect the matching plugging assembly, cutter head, center drill and plugging device according to the construction requirements. Then install the plugging assembly onto the valve that has been installed on the pipeline (the valve is installed on the plugging fitting, the plugging fitting is welded to the pipeline and the previous hole opening process has been completed). Open the pressure balance and then the plugging operation can be carried out. After the plugging head is lowered to the predetermined position, the mechanical lock is achieved by tightening the locking shaft screw. Then the subsequent process can be carried out. The locking shaft copper sleeve in the base and the connecting flange are used for piston rod positioning adjustment and mechanical locking shaft, respectively. The locking shaft copper sleeve is embedded in the base and the connecting flange. The tightness can be adjusted by rotating the locking shaft screw.

Claims

1. Large-bore, ultra-long stroke mechanical lock-type occluder, characterized by It consists of a lifting lug, cylinder head flange, guide flange, cylinder liner protective ring, piston rod, outer sleeve, directional rod, guide copper sleeve, base, connecting flange, and locking mechanism. The lifting lug is connected to the cylinder head flange by welding, and the cylinder head flange is connected to the outer sleeve by bolts. A cylinder liner protective ring is set at the front end of the piston rod. The piston rod has a hollow structure. One end of the piston rod slides with the outer sleeve, and the other end of the piston rod engages with the guide copper sleeve. The guide copper sleeve engages with the directional rod. The guide copper sleeve is connected to the base and the outer sleeve in sequence. A locking mechanism with the same structure is set in the middle of the base and the middle of the connecting flange. The locking mechanism consists of a locking shaft copper sleeve and a locking shaft screw. The locking shaft copper sleeve is embedded in the base and the connecting flange. An L-shaped notch is opened on the annular body of the locking shaft copper sleeve. A screw hole is set on one side of the L-shaped notch. The connecting flange, the outer sleeve, and the base are fixedly connected by bolts.

2. The large diameter, long stroke, band mechanical lock occluder according to claim 1, characterized in that A sealing O-ring is installed between the cylinder head flange and the outer sleeve.

3. The large diameter, long stroke, band and mechanical lock occlusion device of claim 1, wherein The cylinder liner protective ring is made of tin bronze; the locking shaft copper bushing is made of tin bronze.

4. The large-diameter, ultra-long stroke plugging device with mechanical locking according to claim 1, characterized in that: The piston rod is equipped with a double-layer YX sealing ring and a double-layer wear-resistant belt.

5. The large-diameter, ultra-long stroke plugging device with mechanical locking according to claim 1, characterized in that: A YX sealing ring is installed between the piston rod and the guide copper sleeve.

6. The large-diameter, ultra-long stroke plugging device with mechanical locking according to claim 1, characterized in that: A sealing O-ring is installed between the guide copper sleeve and the base, and a sealing O-ring is installed between the guide copper sleeve and the outer sleeve.

7. The large-diameter, ultra-long stroke plugging device with mechanical locking according to claim 1, characterized in that: The connecting flange is equipped with a YX sealing ring and a dustproof ring.

8. The large-diameter, ultra-long stroke plugging device with mechanical locking according to claim 1, characterized in that: A stop is provided on the outside of the connecting flange, and the size of the stop matches the matching assemblies.

9. The large-diameter, ultra-long stroke plugging device with mechanical locking according to claim 1, characterized in that: The guide bushing is made of ductile iron and has a hexagonal internal structure. The directional rod is made of standard hexagonal steel profile.

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