The telescopic device of self loading mixer is a special mechanism used to meet different construction requirements by changing the length of its telescopic pipe and then controlling the inclination angle or height of the discharge chute. Its structural forms include spring telescopic type, hydraulic driving type and hand screw telescopic type.
1. Spring telescopic device. The spring telescopic device is mainly composed of inner tube, outer tube, telescopic spring and limiting device. The structure uses the principle of telescopic spring to assist in the extension operation, which reduces the labor intensity of the operator to a certain extent; The spring resistance should be overcome during the contraction operation, and the controllability is reduced. The spring telescopic type has the advantages of simple structure and low cost, but it has the disadvantages of high labor intensity and difficult operation.
2. Hand screw telescopic device. Hand screw telescopic device mainly consists of outer tube, inner tube, screw, screw nut and bearing. The mechanism uses the principle of transmission motion of screw pair, and the relative displacement of nut and screw realizes the expansion and contraction of the structure. Compared with the above two forms, the hand screw telescopic type has the advantages of simple structure, easy operation and low labor intensity, so it is widely used in the self feeding mixer.
3. Hydraulic driven telescopic device. The hydraulic driven telescopic device can drive the hydraulic cylinder to expand and expand to complete the expansion and contraction of the structure. The degree of automation is improved and the labor intensity is reduced. However, it needs to be equipped with an independent hydraulic drive system to increase the manufacturing cost.