a级毛片无码久久精品免费_柠檬福利第一导航在线_广东少妇大战黑人34厘米视频_色噜噜狠狠综曰曰曰

The anti-collision device of the high-altitude operation lifting platform vehicle has been improved multiple times, and the performance and quality of the anti-collision device of the lifting platform have gradually improved. Even when the height of the high-altitude operation lifting platform truck is greater than 20m, the lifting platform will not collide with objects such as buildings in the air. The initial anti-collision device for the lifting platform was directly composed of an antenna type travel switch. Its protection range is around the two corners of the outer edge of the platform, which is relatively small. Due to the exposed switch housing, a buffer spring (hu á ng) is added between the switch mounting plate and the lifting platform to prevent the switch from being damaged. Even so, the switch is often damaged, indicating the shortcomings of this anti-collision device. In order to increase the protection range of the anti-collision device, an anti-collision frame has been added below the lifting platform. The anti-collision frame is a rectangular flat frame welded with circular tubes, and its protection range covers the four edges below the entire lifting platform. No matter from which direction the lifting platform collides with objects, it can provide protection. The anti-collision frame is connected to the lifting platform by a steel wire rope, which serves as a buffer when colliding with objects and a reset of the anti-collision frame when recovering. Due to the poor elasticity of the steel wire rope during folding, the reset of the anti-collision frame is not good. In order to avoid the protrusion of the clamp plate connecting the steel wire rope and the anti-collision frame, the outer edge of the anti-collision frame can be concave, and the corner of the anti-collision frame adopts a circular arc transition. When there is a collision on the lifting platform, the antenna type travel switch is activated through the anti-collision frame. There are usually two travel switches arranged on the diagonal of the bottom surface of the lifting platform. The second improvement aims to address the disadvantage of poor resetting of the steel wire rope. Referring to the connection method of the anti-collision frame of the Finnish Blancpain fire truck lifting platform, the steel wire rope is changed to a spring component, and the spring is vertically arranged, achieving almost complete resetting effect. According to the size of the lifting platform, 3-4 spring components can be selected to connect the anti-collision frame. When there is no collision, the spring is in a free state, and the anti-collision frame is connected to the lifting platform by the zipper inside the spring coil, causing the spring to deform when there is a collision. The stiffness of the spring should be moderate and meet two requirements: the influence of inertia should not cause the anti-collision device to move; When touching objects, the contact force between the anti-collision frame and the object should not be too strong. The third improvement of the photoelectric switch used for collision prevention on the lifting platform should choose diffuse reflection type. When the modulated light emitted by the transmitter falls on any shape or color object, the light is diffusely reflected, and a part returns to the receiver of the switch. When the intensity of the received light is sufficient, the switch will act. The distance at which the switch operates depends on the material quality, shape, size, color, and surface texture of the object. For the anti-collision device of the high-altitude operation lifting platform, the detection object of the switch is mainly reinforced concrete buildings. If considering that the anti-collision device works when the lifting platform is 200-30mm away from the building, a photoelectric switch with a working distance of 600mm should be selected. The installation form of photoelectric switches is very simple, basically divided into two forms: rectangular and circular. Like proximity switches, photoelectric switches usually have protective functions such as reverse connection and short circuit. With the continuous updating and development of technology related to high-altitude operation lifting platforms, the application scope of high-altitude operation lifting platforms is also constantly expanding. In this practice, the shortcomings of lifting platforms are identified and improved, which brings great help to people's production and life, and is also very profitable.

Previous：Factors affecting the lifting speed of hydraulic lifting platform

Next：11 precautions for using hydraulic pumps on mobile lifting platforms

Return