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Quick Opening Closure is a mechanical device used in the circular opening of a pressure pipeline or pressure vessel. It can realize fast opening and closing.

It is one of the indispensable pieces of equipment in the construction of long-distance pipeline stations. It can also be used in various industries, such as petroleum, the chemical industry, building materials, and rubber.

The Quick Opening Blind has several typical structures. Such as tooth insert type, clamp type, lock ring type, and latch type. Clamp-type Quick Opening Blinds are widely used because of their high adaptation pressure and convenient use. In the early pipeline construction in our country, most of the use of two-piece clamp-type quick-opening blinds. Because of the complex structure and large volume of the two-lobe clamp quick-opening blind plate, it disappeared.

Structure and working principle of three-lobe clamp type Quick Opening Blind plate

Structure

The structure of a three-lobe clamp-type quick-opening blind

It includes a head cover, clamp, flange, safety interlocking device, quick-opening mechanism, swivel arm, and sealing ring.

The head cover, clamp, and flange are the main compression elements. According to the nominal pressure of the three-lobe clamp type Quick Opening Blind Plate, the head cover, clamp, and flange blank include 11-grade forgings through mechanical processing.

The quick-opening mechanism includes left and right rotary trapezoid lead screws. And a pair of left and right rotary trapezoid nuts and connecting parts.

The quick-opening mechanism drives the nut connected to the clamp. Through positive and reverse rotation of the screw rod, the clamp does the radial movement to realize opening and closing.

And locking. The safety interlocking device adopts the pressure self-tightening structure.

which can ensure that the equipment cannot open under pressure. And prevent the opening and closing mechanism from failing due to the loose screw during operation.

Working principle

When closing, move the switch handle on the head cover, and tighten the end face of the head cover. And the end face of the flange, rotate the lead screw of the quick-opening mechanism in the forward direction. The clamp moves in the radial direction and tights the head cover. And flange through the inclined surface, press the sealing ring, and play a sealing role.

When opening, first loosen the bolt of the safety interlock device, and remove the pressure in the container. And then reverse rotate the screw of the quick-opening mechanism, the clamp makes radial movement outwards. And when the head cover can open, move the switch handle on the head cover to open.

Reasonable structure and convenient operation

The opening of the three-lobe clamp type Quick Opening Blind plate is smaller than that of the two-lobe clamp type quick opening blind plate, only 1/3 or 1/4 of the two-lobe clamp type Quick Opening Blind plate, and the swivel arm size is greatly reduced.

There are two sets of quick-opening mechanisms for two-lobe clamp-type Quick-opening blinds and one set of quick-opening mechanisms for three-lobe clamp-type Quick-opening blind plates. Therefore, the structure of a three-lobe clamp-type opening blind is compact and easy to operate.

In the design process, the stress analysis and check of the compression parts carried out by the finite element met based on the conventional calculation.

The stress distribution is ideal and the stress concentration is eliminated Under the premise of the same technical conditions and meeting the strength requirements, the product weight reduces and the flexibility of opening.

Reliable seal

The use of type sealing rings can meet the frequent opening and closing conditions, convenient installation, and disassembly. The type sealing ring adopts fluorine rubber integral extrusion to ensure the service life.

Use safety

The safety interlocking device can close the head cover, and the pressure can increase only after the safety interlocking mechanism. Otherwise, the pressure can not increase; After pressure discharge, the safety interlocking device must open first, and the head cover can only open when the pressure in the container reduces to zero. Otherwise, the head cover cannot open.

The head cover can not close in place, and the safety interlocking device can not load; The device is convenient to manufacture, safe, and reliable.