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 invention discloses a hydraulic precision leveling machine which comprises an upper roller group, a lower roller group, a load bearing beam, a machine base and four upright posts, wherein the upper roller group and the lower roller group are respectively and fixedly provided with power decelerating devices, the load bearing beam is composed of an upper beam and a lower beam which is fixedly arranged on the machine base, the upper roller group is fixedly connected with the upper beam, the lower roller group is fixedly connected with the lower beam, the four upright posts are respectively and fixedly sheathed on four corners of the lower beam, and the upper beam can be movably sheathed on the four upright posts. Both the upper roller group and the lower roller group comprise a plurality of leveling rollers, wall plates, a plurality of support brackets, a plurality of fixing shafts and a plurality of support jockey pulleys, wherein the leveling rollers are arranged side by side and can be rotatablely supported on the wall plates on both sides, the fixing shafts are supported on the support brackets, and the support jockey pulleys can be rotatablely sheathed on the corresponding fixing shaft. The hydraulic precision leveling machine has the advantages of high leveling precision, simple structure and low manufacturing cost, and leveling requirements for plates with different thicknesses can be satisfied.

The invention discloses a gearshift for a gearbox of an engine. Wherein, a driving segment gear is fixed on a gear-shifting shaft, a driven segment gear is clearance fit on the shaft of a shifting hub, and forms flexible connection with the shifting hub through a torsional spring; the driven segment gear is engaged with the driving segment gear; a drive fork is clearance fit on a drive-fork shaft; one end of the drive fork is clearance fit on a cam slot provided on the shifting hub; the driven segment gear is in dovetail segment gear structure, the two sides of the dovetail are correspondingly intercrossed with the tooth profile evolvent of the side teeth at the head and tail of the gear at any location between the indexing circle and the tooth crest circle of the gear; the extended lines of the two sides of the dovetail extend toward the gear and intercrosses. By a driven segment gear to avoid over rotation of the driving segment gear, the invention can avoid the disengagement between the driving and driven segment gear, and guarantee the reliability in gear shifting.

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 relates to the technical field of direct current motors, and discloses a fast-installable direct current motor with a shock-absorbing effect, comprising a bottom plate, the bottom of the bottom plate is fixedly connected with a buffer layer, and the inner thread of the buffer layer is connected with fixing bolts , the top of the base plate is fixedly connected with a card frame, the top of the card frame is clipped with an upper cover, the internal thread of the card frame is connected with a mounting bolt extending to the inside of the upper cover, and the left wall of the upper cover is fixed Connected with bearing housing. The quick-installable DC motor with a shock-absorbing effect buffers the vibration generated by itself through the reverse resistance generated by the shock-absorbing spring when the DC motor body vibrates against the first shock-absorbing tube and the second shock-absorbing tube, In addition, the inner bearing is sleeved on the outside of the rotating shaft, which can make the rotating shaft stable and the vibration is small when rotating, thus effectively solving the problem that the DC motor will generate large vibration during use, and long-term use will affect itself. .

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.

The invention discloses an assembled bridge structure, which comprises a main girder and a bridge pier for supporting the main girder, on the upper end surface of the bridge pier along the longitudinal direction of the bridge, a non-penetrating chute is arranged, on the main girder The bottoms of both ends of the beam are provided with convex ribs corresponding to the chute, and the chute is slidingly matched with the convex rib; the present invention provides an impermeable chute, and when encountering mountainous highways or rivers, etc. When the longitudinal slope of the terrain is large, it can be allowed to slide naturally for a certain distance, and at the same time, the longitudinal position of the main girder can be limited, which can prevent the excessive longitudinal slip of the main girder during operation and avoid the maintenance caused by the slip Trouble. By arranging the support, the sliding process can also reduce the damage of the main girder to the bridge pier, and at the same time, it can also absorb the vibration of the bridge deck.