46results about How to "Avoid maintenance hassles" patented technology

The invention relates to a portal crane. The portal crane comprises a crane body and a moving mechanism arranged at the bottom of the crane body; the crane body comprises a pair of bases, lifting mechanisms arranged on the bases, a cross beam connected between the tops of the lifting mechanisms and a slidable lifting sling which is movably arranged on the cross beam; the slidable lifting sling comprises a drive lifting sling body, a driven lifting sling body connected with the drive lifting sling body and a power part used for driving the drive lifting sling body to slide; and the drive lifting sling body comprises fixing brackets, lifting plate assemblies connected to the fixing brackets and rolling assemblies connected to the bottoms of the fixing brackets, the rolling assemblies are arranged on the cross beam, and the power part is located under the cross beam. According to the portal crane, displacement and adjustment of the lifting sling on the cross beam are achieved, the slidingdistance is increased, sliding is more convenient and more flexible, and maintenance is not needed; and a modular car or a guide rail can be adopted as the moving mechanism, and therefore selection is flexible and diverse.

The present invention relates to a power distribution electric-type load broad-range voltage adjusting device. The voltage regulating grades shunting taps of the transformer three-phase winding are respectively connected with a main control switch and a control system. The main control switch is a dual-relay main control switch formed by the in-series connection of a single-phase alternating current solid state relay SSR and a one-way magnetic protection relay TCK. Moreover, the voltage regulating grades shunting taps of the transformer three-phase winding are connected separately with one end of each main control switches. The other end of the main control switch is connected with the start point of the high-voltage side winding or with the start points of each-phase main control switches that regulate the voltage of the same grade; the intermediate voltage regulating shunting taps of the transformer high-voltage winding and the single-phase alternating current solid state relay are connected in parallel with a closed solid state relay as a watchdog stake switch. The device has the advantages of small body, simple structure, agile action, no impact of gear shifts, no circular current, no harmonious wave, low loss, good security, high reliability, low price, long service life and being free from operation and maintenance; and realizes the function of no circular current load voltage adjustment.

The invention discloses a fruit basket overturning and conveying device adopting T-shaped frames for axial fixation. The device comprises a fruit basket, a fixed overturning plate, standing plates, transmission boxes, brackets and motors; the two sides of the fixed overturning plate are movably connected with the standing plates; the brackets are welded on the side surfaces of the standing plates;the motors are mounted on the brackets, and are in transmission connection with the fixed overturning plate through the transmission boxes; the fixed overturning plate cooperates with the fruit box;the fixed overturning plate consists of rotating shafts, support plates, an overturning plate, the T-shaped frames and positioning devices; the support plates are vertically welded at the bottoms of the two sides of the overturning plate, and are positioned at the middle parts of the two sides of the overturning plate; the rotating shafts are connected to the support plates, and are connected withthe transmission boxes; two T-shaped frames are arranged on the overturning plate; the cross sections of the T-shaped frames are T-shaped; the T-shaped frames cooperate with the positioning devices;and the T-shaped frames cooperate with the fruit box. The device has the beneficial effects of simple structure, less space, low cost, incapability of stopping an outlet of the fruit box, no need of connecting pieces and direct prevention of the maintenance troubles.