Revolving Door Blocking Device with Eccentric Expansion Bolts
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Solution Overview
Problem
Existing two-leaf revolving door systems face challenges in regulating the closing sequence efficiently, particularly in achieving a compact blocking device with easily adjustable braking force, which leads to high power consumption and noise due to permanent energization of the drive motor.
Innovation Solution
The solution involves a blocking device with two expansion bolts arranged eccentrically on a shaft connected to a mechanical transmission element, allowing for simple adjustment of braking force through a clamping screw, resulting in a compact and efficient design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a blocking device is used to control the closing sequence of the revolving door, then the closing sequence can be regulated, but the device becomes complex and the braking force adjustment becomes difficult
Solution Approach 1:
The blocking device is segmented into modular components: brake shoes that can be independently adjusted, expansion bolts that separate the braking function from the actuation mechanism, and a ratchet mechanism that divides the control into directional segments. This segmentation allows each component to be simple while the overall system achieves complex control functionality.
Solution Approach 2:
The brake shoes are made dynamically adjustable through the expansion bolt mechanism, allowing the braking force to be changed without redesigning the entire blocking device. The ratchet mechanism provides dynamic directional control, enabling the door to be blocked in specific phases of its closing sequence while allowing movement in other phases.
2Reliability
If the drive motor is permanently energized to maintain control, then the closing sequence can be precisely controlled, but power consumption and noise increase
Solution Approach 1:
The blocking device operates periodically rather than continuously. The ratchet mechanism allows the drive motor to be energized only during specific phases of the closing sequence when blocking is needed, rather than maintaining constant energization. This periodic operation reduces power consumption and noise while maintaining reliable control when required.
Solution Approach 2:
The ratchet mechanism provides self-locking functionality, maintaining the blocked position without requiring continuous power input. Once the brake shoes engage the brake drum, the ratchet mechanism holds the position mechanically, allowing the drive motor to be de-energized during inactive phases while maintaining control reliability.
3Volume of moving object
If a compact blocking device is designed, then space is saved, but the braking force adjustment becomes more difficult
Solution Approach 1:
The expansion bolts are nested within the brake shoe structure, with the adjustment mechanism integrated into the compact assembly. The clamping screw is positioned to access the expansion bolts without requiring external space, allowing braking force adjustment while maintaining a compact overall device volume.
Solution Approach 2:
The complex mechanical adjustment system is replaced with a simple threaded clamping screw mechanism that directly adjusts the expansion bolts. This substitution provides easy braking force adjustment through a single rotational operation while maintaining the compact nested structure of the blocking device.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design allows for precise control of the closing sequence by adjusting the braking force, reducing power consumption and noise emissions by enabling the drive motor to be de-energized during inactive phases, thus enhancing the operational efficiency of the revolving door system.
Implementation Method 1
The brake shoes (36, 37) are pressed with their brake pads (42, 43) against the brake drum (35) by the expansion bolts (40, 41)
Implementation Method 2
a tension spring (47) which acts on the brake shoes (36, 37) in such a way that the brake shoes (36, 37) are pressed with their brake pads (42, 43) against the brake drum (35)
Data Source
Figure 1~2
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Figure 5~6
AI summary
A device for controlling the closing sequence of a two-wing revolving door installation, which has an overhanging swing wing and an underhanging stationary wing, is described. The swing wing and the stationary wing are each operatively connected to a drive shaft of a drive device. Furthermore, there is a blocking device by means of which the swing wing can be blocked or released depending on the position of the stationary wing, in that it has a coupling point for a mechanical transmission element. The blocking device acts on a movable component of the drive device of the swing wing, in that it has a brake drum coupled to the movable component via a free-running bearing, which cooperates with at least one brake element that at least partially surrounds the brake drum and is spring-loaded against the brake drum.The blocking device further has at least one spreading element which interacts with the braking element by pivoting the spreading element to vent the braking element from the brake drum. The spreading element of the blocking device includes at least two spreading bolts, the spreading bolts being arranged at a distance from one another and the longitudinal central axes of the spreading bolts being arranged at least approximately parallel to one another.