Two-stage pressing manhole device

Abstract

The invention discloses a two-stage pressing manhole device, which belongs to the technical field of sealing of manholes of powdery cargo storage tanks. The two-stage pressing manhole device comprises a manhole cover, a lock pin device, a manhole collar device and a pressing device, wherein the manhole collar device comprises retaining rings, a rotating shaft, a rib plate and pressing lug plates, the manhole cover is hinged to the manhole collar device through the rotating shaft, the lock pin device penetrates through the manhole cover and the pressing lug plates, and the pressing device comprises a pressing shaft and pressing shaft connecting plates. The pressing shaft penetrates through upper shaft holes of the pressing shaft connecting plates, the rotating shaft penetrates through lower shaft holes of the pressing shaft connecting plates and retaining rings, and the pressing shaft can rotate in the pressing shaft connecting plates. The device is still capable of achieving a sealing effect after a seam is formed between the manhole cover and a manhole collar.

Description

technical field [0001] The invention belongs to the technical field of sealing manholes of powder cargo storage tanks, and in particular relates to a two-stage compression type manhole device for powder cargo storage tanks. Background technique [0002] The powder cargo storage tank usually needs to use compressed air to discharge the material in the tank by means of pneumatic conveying. Since the pressure of the conveying system is higher than the external ambient air pressure, the manhole device of the storage tank needs to be sealed during discharge to prevent the powdery material from being released from the human body. Leakage at the hole. At present, the manhole device for powder cargo storage tanks generally adopts a one-stage compression structure. The manhole cover is equipped with a sealing ring. One side of the manhole cover and the manhole seat is connected by a rotating shaft, and the other side is connected by a lock The pin is pressed tightly, and the lock p...

AI Technical Summary

Problems solved by technology

[0003] However, the one-stage compression manhole device has the following disadvantages: 1. After the manhole device has been used for a period of time, due to structural wear or deformation, a gap is formed at the seal between the manhole cover and the manhole seat, and the material can flow through the gap when unloading. 2. One side of the manhole cover is hinged, and the other side is pressed tightly. After the seal ring is worn out, the hinged side cannot be adjusted, resulting in partial wear of the seal ring and poor working condition; 3. The manhole cover adopts riveting structure, The process is complicated, the strength reserve is insufficient, and it is easy to deform; 4. The lock pin is not strong in anti-theft ability and is easy to lose; 5. There is no power-assisted device when the manhole cover is opened and closed, and it depends entirely on manual opening and closing, which is laborious and easy to damage the sealing ring; 6. .There is no operation warning mark, which is easy to cause injury to the operator

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