A pneumatic blind plate obturator and obturation method

Abstract

The application provides a kind of pneumatic blind plate plugging device and plugging method, it is related to flange equipment technical field.The plugging device includes cylinder, sealing mechanism, control mechanism and diffusion mechanism, cylinder includes cylinder cover, cylinder rod, diffusion cylinder and cylinder main body, cylinder structure promotes sealing mechanism to seal flange, sealing mechanism includes flange slot, anti-static gasket, flange sealing pad and sealing press plate, its sealing press plate is connected with cylinder rod, sealing press plate is pressed on flange to complete sealing, control mechanism includes gas guide groove and switch, compressed air accesses the gas inlet hole of gas guide groove, and air passage switching is carried out by switch, diffusion mechanism includes diffusion cylinder and diffusion valve, diffusion cylinder is fixedly installed on sealing press plate and is connected diffusion pipeline, by controlling diffusion mechanism, diffusion and relieving the sealing of flange can be realized.The plugging device guarantees the tightness of sealing, and also has the advantages of simple structure, low maintenance cost, safe use and the like.

Description

Technical Field

[0001] This invention relates to the field of flange equipment technology, and in particular to a pneumatic blind flange plugger and plugging method. Background Technology

[0002] LNG tanker unloading primarily involves hose connection, followed by blind flange sealing of the unloading hose using bolts. In existing technology, the sealing of the unloading hose and blind flange during gas loading and unloading typically uses bolts. However, this bolt tightening process is prone to safety hazards due to habitual violations. These include: some LNG may remain in the hose after unloading; after sealing the blind flange, the LNG may vaporize due to temperature changes. Reopening the flange could easily lead to a natural gas leak, causing a chain reaction of injuries or explosions. Furthermore, manually installing gaskets, bolts, and nuts after connecting the unloading hose flange to the blind flange and then tightening them individually is labor-intensive. Without supervision, operators frequently violate regulations, such as omitting gaskets, loosening bolts, or using fewer bolts, all posing significant safety risks. Therefore, further improvements to existing sealing equipment and methods are necessary. Summary of the Invention

[0003] To ensure tight sealing during tank truck unloading, avoid the dangers of gas leakage, and facilitate equipment connection, this invention provides a pneumatic blind flange plug and a plugging method, the specific technical solution of which is as follows.

[0004] A pneumatic blind flange plugger includes a cylinder, a sealing mechanism, a control mechanism, and a venting mechanism. The cylinder and the sealing mechanism cooperate with each other, and the control mechanism cooperates with the venting mechanism. The cylinder includes a cylinder head, a cylinder rod, a venting cylinder, and a cylinder body. The cylinder structure drives the sealing mechanism to seal the flange. The sealing mechanism includes a flange groove, an antistatic gasket, a flange sealing gasket, and a sealing pressure plate. The sealing pressure plate is connected to the cylinder rod. After the sealing pressure plate is activated, it presses against the flange to complete the seal. The control mechanism includes an air guide groove and a switch. A compressed air pipeline is connected to the air inlet of the air guide groove. The air passage is switched by the switch. The venting mechanism includes a venting cylinder and a venting valve. The venting cylinder is fixedly installed on the sealing pressure plate and connected to the venting pipeline. The gas of the venting mechanism is controlled to release the seal on the flange.

[0005] Preferably, the valve handle of the vent valve cooperates with a switch, and when the vent valve is closed, the valve handle extension section of the vent valve swings as a limit switch.

[0006] Preferably, the antistatic gasket is placed in the flange groove, and the flange sealing gasket is fixedly installed on the sealing pressure plate.

[0007] Preferably, the flange groove has an arc-shaped notch in the middle, the flange groove is fixedly installed on the base plate, the base plate is also fixedly installed on the base plate, the cylinder is fixedly connected to the back plate, and the antistatic gasket is arc-shaped and matches the groove of the flange groove.

[0008] Preferably, the air guide groove and the switch are fixedly mounted on the switch bracket; one end of the venting cylinder is fixedly mounted on the sealing pressure plate, and the other end is connected to the venting pipeline through a flexible hose.

[0009] Preferably, the components of the pneumatic blind flange plug are made of aluminum alloy or stainless steel.

[0010] A pneumatic blind flange sealing method, utilizing the aforementioned pneumatic blind flange sealing device, includes: placing the unloading flange into the flange slot, swinging the switch to allow compressed air to enter the air guide groove, and then pushing the cylinder rod to push the sealing pressure plate, which presses the flange to complete the seal.

[0011] A further preferred embodiment is that the valve handle of the vent valve swings, and when the valve handle of the vent valve is parallel to the vent cylinder, the vent channel opens, the switch deviates from the swing space, and the gas in the pipeline is released; after the switch swings, the compressed air enters the cylinder again through the air guide groove, pushes the cylinder rod to move in the opposite direction, the sealing pressure plate separates from the flange, and the seal is released.

[0012] A further preferred application is the fastening of the hose flange and blind flange during the natural gas unloading process.

[0013] The beneficial effects of the pneumatic blind flange plugger and blind flange plugging method provided by this invention are as follows: the plugger achieves sealing through cylinder actuation, solving the problem of incomplete sealing caused by manual sealing operations; the linkage design of the control mechanism avoids the risk of gas leakage; the plugger has a compact overall structure and also has the advantages of low manufacturing cost and good durability. Using this plugger for sealing also has the advantages of simple connection, convenient replacement, and good safety. Attached Figure Description

[0014] Figure 1 This is an exploded view of the structure of a pneumatic blind flange plugger;

[0015] Figure 2 This is a schematic diagram of the installation structure of a pneumatic blind flange plugger;

[0016] Figure 3 This is a schematic diagram of the cross-sectional structure of a pneumatic blind flange plugger;

[0017] Figure 4 This is a front view of the pneumatic blind flange plugger;

[0018] Figure 5 This is a left view of a pneumatic blind flange sealer;

[0019] Figure 6 This is a right view of the pneumatic blind flange plugger;

[0020] Figure 7 This is a top view of a pneumatic blind flange plugger;

[0021] In the diagram: 1-Flange slot, 2-Antistatic gasket, 3-Flange sealing gasket, 4-Sealing pressure plate, 5-Cylinder head, 6-Cylinder rod, 7-Ventilation cylinder, 8-Cylinder body, 9-Air guide groove, 10-Switch bracket, 11-Back plate, 12-Ventilation valve, 13-Base plate, 14-Switch. Detailed Implementation

[0022] Combination Figures 1 to 7 As shown, a specific embodiment of the pneumatic blind flange plugger and plugging method provided by the present invention will be described.

[0023] A pneumatic blind flange plugger includes a cylinder, a sealing mechanism, a control mechanism, and a venting mechanism. Through the cooperation of these components, pneumatic plugging of the blind flange is achieved. The cylinder is designed to push the sealing assembly to seal the flange, eliminating the need for manual bolt sealing. The extended length of the venting valve handle enables linkage control. When the venting valve is closed, its handle will block the swing of the switch, ensuring that the pipeline can only be controlled by the cylinder when it is in the venting state. The blind flange plugger has the advantages of high efficiency and high safety performance, and can also effectively prevent habitual violations.

[0024] The system comprises a cylinder and a sealing mechanism that work together, as well as a control mechanism and a venting mechanism. The cylinder includes a cylinder head, cylinder rod, venting cylinder, and cylinder body. The cylinder rod's movement drives the sealing mechanism to seal the flange. The sealing mechanism includes a flange groove, an anti-static gasket, a flange sealing gasket, and a sealing plate. The sealing plate is connected to the cylinder rod, and its movement presses against the flange to complete the seal. The control mechanism includes an air guide groove and a switch. Compressed air is supplied through the air inlet of the air guide groove, and the switch switches the air passage. The venting mechanism includes a venting cylinder and a venting valve. The venting cylinder is fixedly mounted on the sealing plate and connected to a venting pipeline. Controlling the venting mechanism releases the gas and releases the seal on the flange.

[0025] The cylinder structure includes a cylinder head, cylinder rod, cylinder body, sealing rings, and screws, etc. It is the power system of the pneumatic blind flange plugger, which drives the plugger to work by outputting kinetic energy from the front and rear.

[0026] The sealing mechanism includes a flange groove, an antistatic gasket, a flange sealing gasket, and a sealing pressure plate. It is the sealing system of a pneumatic blind flange plugger. The antistatic gasket is embedded in the flange groove, and the flange sealing gasket is embedded in the sealing pressure plate. The unloading flange is placed into the flange groove, and compressed air is introduced into the air guide groove via a swing switch. The compressed air enters the bottom of the cylinder by adjusting the air inlet position, pushing the cylinder rod forward. The sealing pressure plate connects with the cylinder rod, pressing down on the flange to complete the seal. The flange groove has an arc-shaped notch in the middle and is fixedly mounted on a base plate. A back plate is also fixed to the base plate, and the cylinder is fixedly connected to the back plate. The antistatic gasket is arc-shaped and mates with the groove of the flange groove.

[0027] The control mechanism consists of an air guide groove, a switch bracket, a switch, a sealing gasket, and screws. The air guide groove and the switch are fixedly mounted on the switch bracket. One end of the vent cylinder is fixedly mounted on the sealing pressure plate, and the other end is connected to the vent pipeline via a flexible hose. The air guide groove and the switch are mounted on the switch bracket. Compressed air enters the air inlet of the air guide groove, and the air passage is switched by a swing switch to complete the forward and backward movement of the cylinder.

[0028] The venting mechanism includes a venting cylinder and a venting valve. The valve handle of the venting valve works in conjunction with a switch. When the venting valve is closed, the limit switch on the extended section of the valve handle swings. The front end of the venting cylinder is welded to a sealing plate, and the end is connected to the plant's venting pipeline via a flexible hose. Venting of the gas passage is achieved by swinging the venting valve. Linkage control is achieved by extending the length of the venting valve handle. When the venting valve is in the closed state, its handle will block the swing of the switch, thereby ensuring that the pipeline can only control the cylinder when it is in the venting state.

[0029] The components of the pneumatic blind flange plug are made of aluminum alloy or stainless steel.

[0030] A pneumatic blind flange sealing method, utilizing the aforementioned pneumatic blind flange sealing device, includes: placing the unloading flange into the flange slot, swinging the switch to allow compressed air to enter the air guide groove, and then pushing the cylinder rod to push the sealing plate, which presses the flange to complete the seal. During sealing, the unloading flange is placed in the flange slot, and compressed air is introduced into the air guide groove through the swing switch. The air inlet position is adjusted to allow compressed air to enter the bottom of the cylinder; the cylinder rod is pushed forward, connecting the sealing plate to the cylinder rod and pressing the flange to complete the seal. To release the seal, the vent valve handle is swung upwards until it is parallel to the vent cylinder. At this time, the vent channel is open, allowing space for the switch to swing, and excess natural gas in the pipeline is released, eliminating safety hazards; then the switch is swung to allow compressed air to enter the top of the cylinder through the air guide groove, while compressed air at the bottom of the cylinder is discharged, pushing the cylinder rod backwards. The sealing plate follows the cylinder rod backwards, releasing the seal on the flange.

[0031] The vent valve handle swings, and when the handle is parallel to the vent cylinder, the venting channel opens, the switch deviates from the swinging space, and the gas in the pipeline is released. After the switch swings, compressed air re-enters the cylinder through the air guide groove, pushing the cylinder rod to move in the opposite direction, separating the sealing plate from the flange, and releasing the seal. This is used for the connection and fastening of hose flanges and blind flanges during natural gas unloading.

[0032] This sealing device achieves sealing through cylinder actuation, solving the problem of incomplete sealing caused by manual sealing operations. Its linkage design through a control mechanism avoids the risk of gas leakage. The sealing device has a compact overall structure and also boasts advantages such as low manufacturing cost and high durability. Using this sealing device for plugging also offers advantages such as simple connection, convenient replacement, and good safety.

[0033] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A pneumatic blind flange plugger, characterized in that, The system includes a cylinder, a sealing mechanism, a control mechanism, and a venting mechanism. The cylinder and sealing mechanism cooperate with each other, and the control mechanism cooperates with the venting mechanism. The cylinder includes a cylinder head, a cylinder rod, a venting cylinder, and a cylinder body. The cylinder structure drives the sealing mechanism to seal the flange. The sealing mechanism includes a flange groove, an anti-static gasket, a flange sealing gasket, and a sealing pressure plate. The sealing pressure plate is connected to the cylinder rod. After the sealing pressure plate is activated, it presses against the flange to complete the seal. The control mechanism includes an air guide groove and a switch. The compressed air pipeline is connected to the air inlet of the air guide groove. The air passage is switched by the switch. The venting mechanism includes a venting cylinder and a venting valve. The venting cylinder is fixedly installed on the sealing pressure plate and connected to the venting pipeline. By controlling the venting mechanism, the gas is released and the seal on the flange is released. The valve handle of the vent valve is coupled with a switch, and when the vent valve is closed, the limit switch on the extension section of the valve handle of the vent valve swings. The air guide groove and the switch are fixedly installed on the switch bracket; one end of the venting cylinder is fixedly installed on the sealing pressure plate, and the other end is connected to the venting pipeline through a flexible hose.

2. The pneumatic blind flange plugger according to claim 1, characterized in that, The antistatic gasket is installed in the flange slot, and the flange sealing gasket is fixedly installed on the sealing pressure plate.

3. A pneumatic blind flange plugger according to claim 2, characterized in that, The flange slot has an arc-shaped notch in the middle. The flange slot is fixedly installed on the base plate, and a back plate is also fixed on the base plate. The cylinder is fixedly connected to the back plate. The antistatic gasket is arc-shaped and matches the groove of the flange slot.

4. A pneumatic blind flange plugger according to claim 1, characterized in that, The components of the pneumatic blind flange plug are made of aluminum alloy or stainless steel.

5. A method for sealing a pneumatic blind flange, characterized in that, The pneumatic blind flange plugger according to any one of claims 1 to 4 includes: placing the unloading flange into the flange slot, swinging the switch to allow compressed air to enter the air guide groove, and then pushing the cylinder rod to push the sealing plate, which presses the flange to complete the seal.

6. The pneumatic blind flange sealing method according to claim 5, characterized in that, When the valve handle of the vent valve swings and is parallel to the vent cylinder, the vent channel opens, allowing space for the switch to swing, and the gas in the pipeline is released. After the switch is swung, compressed air enters the cylinder again through the air guide groove, pushing the cylinder rod to move in the opposite direction, separating the sealing plate from the flange, and releasing the seal.

7. A pneumatic blind flange sealing method according to claim 6, characterized in that, It is used for fastening the connection between the hose flange and the blind flange during the natural gas unloading process.

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