48results about How to "Prevent top damage" patented technology

A mechanical motored lock cylinder using a thin key card includes a motored pushbutton (1), a rotor(9), a cylinder case (3) receiving outside pins (14) and inside pins (15), and a thin key card (11) with identifying pin holes (28). In which, an outside pin sliding piece (17) and an inside pin sliding piece (18) controlled by a sliding way body with a sliding platform or a sliding groove are set in the cylinder case (3), an outside pin guiding body (7) and a support body supporting the key card for retaining the thin key card (11) are mounted between an outside pin closing board (6) and the rotor (9),a pin head (2) with bullet or wedge piece and a position block (21) clipped by the outside pin closing board (6) are provided outside of the outside pin pole (23), pin through-holes corresponding to the identifying pin holes (28) in the key card (11); are respectively provided in the outside pin closing board (6),the outside pin guiding body (7) and the support body (8).

The invention discloses a straight walking type plate shearing machine, which belongs to the field of machining equipment. The straight walking type plate shearing machine comprises a shearing machine and a feeding device, wherein the feeding device is matched with the shearing machine, a straight walking mechanism is arranged at the bottom of the shearing machine, and the straight walking mechanism comprises a switch rail, a flat rail and a plurality of groups of roller assemblies; double inclined planes are formed on both sides of the upper part of the switch rail, the distance of the top ends of the double inclined planes is less than that of the bottom ends of the double inclined planes, and the center line of the flat rail is parallel to that of the switch rail; and the roller assemblies include concave rollers which are matched with the switch rail and flat rollers which are matched with the flat rail, and grooves which are matched with the upper part of the switch rail are formed in the surfaces of the concave rollers. The straight walking type plate shearing machine has the advantages of low cost and high practicability, the problem of incapability of straight walking of an existing walking type shearing machine is effectively solved, the structural design is optimized, the straight walking of the walking type shearing machine is realized by adopting a simple structure, and the plate shearing accuracy is guaranteed.

The invention discloses a lifting oil cylinder for agricultural machinery. The lifting oil cylinder for the agricultural machinery comprises a cylinder barrel, a cylinder cover, a piston and a piston rod; the external rod section of the piston rod is provided with a limiting stop clamp; a rod cavity oil port and a rodless cavity oil port are formed in the cylinder cover; the rodless cavity oil port communicates with a rodless cavity through a rodless cavity oil channel; a stop valve is arranged at the rodless cavity oil port; a connecting channel communicating with the rodless cavity oil port and the rodless cavity oil channel is further formed in the cylinder cover; and a check valve is arranged in the connecting channel. According to the lifting oil cylinder for the agricultural machinery, after a main engine of the lifting oil cylinder for the agricultural machinery is adopted for storing or transporting for a long time, when the lifting operation is started again, oil liquid of the rodless cavity oil port bypasses the stop valve, firstly the check valve is opened so that the oil liquid can enter the rodless cavity, when the oil liquid in the rodless cavity pushes the piston rod to be lifted to a certain position, the stop valve can be normally opened, the piston rod is continuously lifted, and therefore the phenomena that a valve rod abuts against and damages the limiting stop clamp or damages a sealing part, and the limiting stop clamp abuts against and damages the stop valve can be avoided, the failure rate of the oil cylinder can be reduced, and the service life of the oil cylinder can be prolonged.