Quick opening closure manufacturers

Description

1. Introduction

A quick opening blind plate is a mechanical device used to realize quick opening and closing on pressure-bearing special equipment. Since it does not need to tighten or loosen the fasteners one by one. Moreover, it has short opening and closing times and convenient material loading and unloading. Therefore, we often use this product in oil and gas stations. So if you want to know more about quick opening closure manufacturers, please contact our professionals to answer them for you.

2. Structural form and working principle of quick opening blind plate

2.1 structural form of quick opening blind plate

The quick-opening blind plate has various structural forms. It mainly has several typical structures, such as tooth type, clamp type, lock ring type, and plug-in type. Clamp type quick opening blind plate is widely used because of their high pressure and convenient use. It is a quick-opening blind plate that can be opened or closed quickly by loosening or tightening the clamp. In the early pipeline construction in China, most of the two-piece clamp-type quick-opening blind plates were used. Because of the complex structure and large volume of the two-piece clamp type quick opening blind plate. It is gradually eliminated. In pipeline construction in recent years. The three-piece clamp type quick opening blind plate has gradually replaced the two-piece clamp type quick opening blind plate. Three pieces clamp-type quick-opening blind plate is flexible and easy to operate.

2.2 structural form of three-piece clamp type quick opening blind plate

Three pieces clamp type quick opening blind plate is mainly composed of a blind plate cover, clamp, blind plate seat, safety interlock mechanism (safety clamp, vent valve, positioning pin), opening and closing mechanism (screw rod, opening, and closing nut), sealing ring, rotating arm (hinge shaft, adjusting nut), etc.

2.3 working principle of three-piece clamp type quick opening blind plate

The three-piece clamp type quick opening blind plate realizes the opening and closing function through the left and right spiral ladder-shaped lead screws, a pair of left and right spiral ladder-shaped nuts, and connectors on the opening and closing mechanism. The opening and closing mechanism drives the nut connected with the clamp through forward and reverse rotation of the screw rod to make the clamp move radially to realize opening and closing and locking.

When the three-piece clamp type quick opening blind plate is opened. First, loosen the vent valve of the safety interlock mechanism. After the pressure in the container is discharged, remove the safety clamp, and then rotate the lead screw of the opening and closing mechanism in the reverse direction to make the clamp move radially outward. When the blind plate cover can be opened, move the handle on the blind plate cover to open it.

When closing, move the handle on the blind plate cover, close the end face of the blind plate cover and the end face of the blind plate seat, rotate the lead screw of the opening and closing mechanism in the positive direction, and make the clamp move radially inward. Tighten the blind plate cover and the blind plate seat through the inclined surface, press the sealing ring, then install the safety clamp and tighten the vent valve.

2.4 main characteristics of three-piece clamp type quick opening blind plate

1. Convenient operation. The three piece clamp type quick opening blind plate can be opened or closed only through a set of opening and closing mechanisms, with small opening, compact structure and convenient operation.
2. Reliable sealing. The sealing ring of the three piece clamp type quick opening blind plate adopts O-ring or other suitable self tightening sealing ring, which can meet the working condition of frequent opening and closing, and is easy to assemble and disassemble.
3. Safe and reliable use. The safety interlock mechanism of the three piece clamp type quick opening blind plate ensures that the pressure can be increased only after the blind plate cover is closed in place and the safety interlock mechanism is installed; When opening, the pressure in the container must be confirmed to have been reduced to zero, and then the safety interlock mechanism can be opened before the blind plate cover can be opened; otherwise, the blind plate cover cannot be opened; If the blind plate cover is not closed in place and the clamp is not locked, the safety interlock mechanism cannot be installed and the pressure cannot be increased; The blind plate cover is closed in place, the clamp is locked, and the head cover cannot be opened after the safety interlock mechanism is installed.

3. Use and maintenance of three piece clamp type quick opening blind plate

3.1 opening process

1. The operator of quick opening blind plate must be familiar with the structural principle and operating procedures of quick opening blind plate.
2. When opening, the pressure in the container must be confirmed to have been reduced to zero, and then the safety interlock mechanism can be opened before the blind plate cover can be opened. Otherwise, the blind plate cover cannot be opened.
3. If the safety interlock mechanism is opened, when there is material overflowing from the vent valve, stop screwing the vent valve. When there is no more material overflowing in the equipment, completely unscrew the vent valve.

3.2 closing process

1. Before the blind plate cover is closed, the dirt in the sealing surface, sealing groove, O-ring, and clamp of the blind plate seat shall be completely removed, and anti-rust grease shall be applied, and then the O-ring shall be installed without distortion.
2. The O-ring shall be selected according to the design size. And it is not allowed to install the O-ring inconsistent with the design requirements.
3. When closing the blind plate cover, make the blind plate cover completely coincide with the outer edge of the blind plate base. If there is a small amount of misalignment between the blind plate cover and the blind plate base, and there is eccentricity, the blind plate cover and the blind plate base shall be adjusted by the adjusting nut and the adjusting bolt on the rotating arm to make the blind plate base completely coincide with the outer edge of the blind plate cover.
4. During the closing process of the blind plate cover, it is not allowed to use force combination, and it is not allowed to install it into the clamp by knocking and collision.
5. Clamp tightly. Before installing the safety clamp, confirm that the blind plate cover and the flange surface of the blind plate seat are in the clamp groove of the clamp. Meanwhile, the left and right screw rods of the opening and closing mechanism should be able to rotate easily and flexibly until the clamp reaches the predetermined position. The safety clamp should be able to be easily installed into the positioning pin.
6. Before pressurizing the equipment, it must be confirmed that the blind plate has been completely closed.

3.3 routine maintenance

1. During the operation of the equipment, it is prohibited to knock and collide with the main pressure-bearing parts of the blind plate.
2. The screw, hinge shaft, pin shaft, and other rotating devices of the blind plate must be lubricated regularly. The above parts shall be filled with lubricating grease at least once every half a year. The hinge shaft and lead screw are lubricated with yellow glycerin, and the pin shaft is lubricated with engine oil from the oil injection hole.
3. Keep the paint on the outer surface of the blind plate intact and clean.
4. Regularly check the main pressure-bearing parts of the blind plate, such as the blind plate cover, blind plate seat, clamp, hinge shaft and lead screw. If there is any deformation, serious corrosion or crack, find out the reason in time and handle it properly.
5. Before closing the blind plate each time, the sealing groove, sealing surface, and O-ring shall be cleaned, inspected, and coated with lubricating oil to prevent sealing during use.
6. The parts and components on the quick-opening blind plate shall be intact and shall not be damaged or missing.
7. As the quick opening blind plate used on the receiver and launcher of the pipeline. The inner cylinder of the quick opening blind plate is not pressurized under normal conditions. If the inner cylinder of the quick opening blind plate is pressurized. The front valve shall be timely checked to see if it is closed or there is internal leakage. In case of internal leakage of the front valve, it shall be inspected, repaired or replaced in time.

4. Common faults and treatment methods of three piece clamp type quick opening blind plate

4.1 leakage at blind sealing ring and vent valve

1. There is dirt on the sealing groove, sealing surface and O-ring surface. Check and clean it before installing the sealing ring.
2. The sealing ring is aging. Check and replace the sealing ring.
3. The blind plate cover and the blind plate seat flange are not embedded in the clamp groove. Check and adjust that the blind plate cover and the outer edge of the blind plate seat completely coincide.
4. The clamp is not locked to the predetermined position. Check and tighten the screw rod of the opening and closing mechanism until it reaches the predetermined position.
5. The vent valve is not tightened. Please check and tighten the vent valve.

4.2 safety interlock mechanism cannot be installed in place

1. The clamp is not tightened to the predetermined position, and the safety clamp cannot be installed into the positioning pin. Check and tighten the screw rod of the opening and closing mechanism until it reaches the predetermined position.
2. There are foreign matters in the clamp groove or outside the blind plate cover and blind plate seat flange. So the clamp cannot be tightly clamped, and the safety clamp cannot be installed into the locating pin. Check and clean it and then close it again.
3. The blind plate cover and the blind plate seat are misaligned, there is eccentricity, the clamp cannot be tightened, and the safety clamp cannot be installed into the locating pin. Check and adjust the adjusting nut and the adjusting bolt on the rotating arm to make the outer edge of the blind plate seat and the blind plate cover completely coincide.
4. The clamp fails to clamp the blind plate cover or blind plate seat flange into the groove, resulting in the clamp cannot being tightened. And the spacing between the positioning pins is too large to install the safety clamp. Check and adjust that the blind plate cover and the outer edge of the blind plate seat are completely overlapped. Confirm that the blind plate cover or blind plate seat flange is clamped into the groove, and then screw the screw rod of the opening and closing mechanism.

4.3 it is difficult to open the quick-opening blind plate

1. The screw rod or split nut is rusted, and the rotation is laborious. Add rust remover or lubricating oil and then rotate the screw rod.
2. The safety clamp is not removed, which makes it difficult to rotate the lead screw. Check and confirm that the pressure in the cylinder is zero. Remove the safety clamp and then rotate the lead screw.

4.4 it is laborious to close the quick-opening blind plate

1. The screw rod or split nut is rusted, and the screw rod can be rotated after adding rust remover or lubricating oil.
2. There are foreign matters in the clamp groove or outside the blind plate cover and blind plate seat flange. Close the quick-opening blind plate after inspection and cleaning.
3. The blind plate cover and the blind plate seat are misaligned. There is eccentricity, the clamp is unable to hold tightly. And it is difficult to rotate the lead screw. Check and adjust that the blind plate cover and the outer edge of the blind plate seat completely coincide. And then close the quick-opening blind plate.
4. The clamp fails to clamp the blind plate cover or blind plate seat flange into the groove, which causes the clamp to be unable to hold tightly, and it is difficult to rotate the lead screw. Check and adjust that the blind plate cover and the outer edge of the blind plate seat completely coincide. And confirm that the blind plate cover or blind plate seat flange is clamped into the groove before closing
5. The use section of the O-ring is large, resulting in the blind plate cover cannot be closed in place, the clamp cannot clamp the blind plate cover into the clamp groove, the clamp cannot hold tightly, and it is difficult to rotate the lead screw. Check and replace the O-ring that meets the requirements before closing.

5. Conclusion

Three piece clamp-type quick opening blind plate is used as the accessory of a pipe receiver, launcher, or process pressure vessel. It is more and more used in oil and gas stations. We must attach great importance to it and correctly use and maintain it. Only in this way can the quick-opening blind plate be in good condition. This can also ensure the safe and reliable operation of the oil and gas station.