RU224247U1 - Telescopic mast - Google Patents

Abstract

The utility model relates to antenna technology and can be used in telescopic masts designed to lift antenna devices to a given height. The telescopic mast contains a fixed section, at least one movable section and an upper section, and a winch with a drum with a cable is attached to the fixed section, one end of which is wound on the drum, and the other is secured through a roller installed at the upper end of the fixed section and two rollers installed at the lower end of the movable section, as well as a cable attached through a roller at the upper end of the movable section and connected to the lower end of the upper section, while the fixed section contains guide rollers located at the upper end of the section, the upper section contains guide rollers located at the lower end sections, and the movable section contains guide rollers located at the upper and lower ends of the section. The technical result of the claimed utility model is to increase the reliability of deployment and retraction of the mast structure in difficult climatic conditions. 2 ill.

Description

Application area

The utility model relates to antenna technology and can be used in telescopic masts designed to lift antenna devices to a given height.

State of the art

A truss telescopic mast is known, including retractable sections connected by a system of cables and rollers to the winch drum and to each other (see A.S. 370688, M. class H01Q 9/32, publ. 11/15/73, B.I. 11) [1].

The telescopic mast contains a fixed section with a winch and drum installed on it, and movable sections kinematically connected by a system of cables and rollers to the winch drum and to each other. When the winch handle is rotated clockwise, the cable is wound onto the drum, which ensures the simultaneous exit of all moving sections of the mast. When the winch handle is rotated counterclockwise, the cable is unwinded from the drum, and the moving sections, under the influence of their own weight, as well as the weight of the antenna device, fit into one another, i.e. The telescopic mast collapses.

A disadvantage of the known mast is unreliable operation when rolled up in difficult climatic conditions (icing, dust) and when left in the deployed position for a long time. According to the instructions, in this case it is recommended to swing the upper movable section. However, in this case, the upper section often spontaneously falls, leading to damage to the antenna attached to it.

The reason for the fall of the upper section is the sagging of the cable that ensures the lifting of this section, due to the fact that the penultimate section, the mass of which is significantly greater than the mass of the upper section, has fallen.

A telescopic mast is known (RF patent 2198131), containing a fixed outer section fixed to the base, movable intermediate and inner sections, in the lower parts of which nuts are installed, a drive screw with a groove for placing the nuts, and locks in the folded and unfolded states. The disadvantage of the known mast is the complexity of the design.

Essence of a utility model

The technical result of the claimed utility model is to increase the reliability of deployment and retraction of the mast structure in difficult climatic conditions, significantly better straightness of the extended mast shaft, which has a positive effect on the stability of the mast structure as a whole and uniform load transfer along the mast shaft.

A telescopic mast is claimed, containing a fixed section, at least one movable section and an upper section, and a winch with a drum with a cable is attached to the fixed section, one end of which is wound on the drum, and the other is secured through a roller and two rollers installed at the upper end of the fixed section installed at the lower end of the movable section, as well as a cable secured through a roller at the upper end of the movable section and connected to the lower end of the upper section, while the fixed section contains guide rollers located at the upper end of the section, the upper section contains guide rollers located on the lower end of the section, and the movable section contains guide rollers located at the upper and lower ends of the section.

Brief description of drawings

In fig. 1 - kinematic diagram of a telescopic mast containing four sections. In fact, the number of sections is determined by the required lifting height of the antenna installed on the mast. However, the kinematic connection of the sections does not change.

The telescopic mast contains a fixed section 1 with a winch 2 installed on it with a drum 3. A cable 4, one end of which is wound on the drum 3, and the other is fixed at the upper end of section 1, through a roller 7 installed on the upper end of section 1, and two rollers 6, installed at the lower end of the movable section 8, kinematically connects sections 1 and 8. Cable 9 is connected to the lower end of section 10 through a roller 7 installed at the upper end of section 8. Similarly, cable 11 is connected through a roller 7 installed at the upper end of section 8 , is connected to the lower end of the upper movable section 12.

In fig. Figure 2 shows a diagram of the arrangement of rollers 7 on the sides of the mast.

Implementation of a utility model

The claimed utility model works as follows.

When drum 3 rotates clockwise, cable 4 is wound onto drum 3, which ensures lifting of section 8 through rollers 6 and 7.

When section 8 is lifted, the distance between the upper ends of sections 1 and 8 increases, as a result of which cable 9 ensures extension of section 10. Similarly, cable 11 ensures extension of section 12.

The kinematic scheme ensures the simultaneous extension of all moving sections 8, 10, 12.

When drum 3 rotates counterclockwise, cable 4 is unwinded from the drum and section 8 is lowered under its own weight, which in turn reduces the tension of cables 9 and 11. Sections 10 and 12, similar to section 8, are lowered under their own weight.

To reduce the gaps between sections, as well as the free (friction-free) movement of sections between each other, guide rollers 5 are included in the design of each section. Fixed section 1 contains guide rollers only at the upper end, the upper section 12 - only at the lower end. In the remaining sections, guide rollers are located at both ends.

To prevent skewing of the mast trunk during lifting, alternating mast faces are used to position the lifting cables 4, 9, 11 and rollers 7 from the lower section to the upper ones.

Additionally, the mast design contains a locking mechanism 13, which is designed to remove the load from the winch drum and transfer it to the lower section and then to the mast foundation.

Claims (1)

A telescopic mast, characterized in that it contains a fixed section, at least one movable section and an upper section, and a winch with a drum with a cable is attached to the fixed section, one end of which is wound on the drum, and the other is secured through a roller installed at the upper end of the fixed section and two rollers installed at the lower end of the movable section, as well as a cable secured through a roller at the upper end of the movable section and connected to the lower end of the upper section, while the fixed section contains guide rollers located at the upper end of the section, the upper section contains guide rollers located at the lower end of the section, and the movable section contains guide rollers located at the upper and lower ends of the section.