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 safety control device for anti-backward tilting of a crane jib, comprising a display, a controller, an angle sensor, a low-pressure alarm pressure switch, and a high-voltage alarm pressure switch; Compared with the setting value of the tilt limit position, a limit position limit signal is sent to stop the oil cylinder from retracting; the display is used to receive the anti-backward length signal sent by the controller, display it in real time on the display, and set it in the display Set a pre-alarm range for anti-backward limit, and when the anti-backward length reaches this range, an alarm window will pop up to remind the operator. The invention avoids the problem of inaccurate data display caused by signal interference; improves the generality and operation convenience of the detection of the limit position of anti-backward tilt; increases the pre-alarm function of the limit position of anti-backward tilt; improves the accuracy and accuracy of the entire anti-backward tilt safety control system. Reliability; reduce the cost of the anti-roll safety control system.

The invention discloses an automobile component punching forming die, and belongs to the technical field of automobile component punching. The automobile component punching forming die comprises a bottom plate, a first air pump, a male die, a top plate and a female die. The first air pump is connected to the top of the bottom plate, the female die is connected to the top plate, the end, away fromthe bottom plate, of the first air pump is connected with a sliding plate, the male die is connected to the outer wall of the sliding plate, ejector pins are connected to the inner wall of the femaledie, the tops of the ejector pins are connected with a pressing plate, the top of the pressing plate is connected with second air pumps, and the outer wall of each second air pump is connected with agas releasing valve and a one-way valve; and the ends, away from the female die, of the ejector pins penetrate through the second air pumps and are connected with pistons, and the ends, arranged in the female die, of the ejector pins are connected with ejector sheets. Through the arrangement of the second air pumps, it can be guaranteed that the stretching length of the ejector pins in the motionprocess is proper, and the situation that the ejector pins jack the dies to damage is avoided; and cost is reduced, manual drawing is avoided, the labor intensity is lowered, the work efficiency is improved, and repeated operation is convenient.

The invention discloses a method for retaining a gob-side tunnel, which overall arranges the retaining of the gob-side tunnel in a stope working face gateway tunneling period, and comprises the steps of: combining the stope working face gateway with the gob-side retained tunnel, namely the next section gateway, together to be served as one tunnel for tunneling; and constructing tunnel concrete pier columns between the stope working face gateway and the gob-side retained tunnel, wherein the tunnel concrete pier columns are served as support in the tunnel and also served as one part of the side support for the gob-side retained tunnel; namely comprising the steps of: widening the section of the tunnel by tunneling, reserving the tunnel section according to the shrinkage factor of the god-side retained tunnel suffering from two times of support pressure, and pouring the reinforcing steel bar concrete pier columns in middle of the transverse direction of the tunnel to match with a cable anchor for supporting. The tunnel concrete pier columns are arranged along the whole length of the tunnel at intervals, and used for dividing the tunnel into two parts. Insulating walls are constructed between two adjacent columns after the columns are constructed. When the stope is starting, the support is needed to be temporarily reinforced at two sides of the columns according to requirements along with the advancing of the stope working face. According to the method for retaining a gob-side tunnel, the retaining of the gob-side tunnel and the tunneling of the stope working face gateway are overall arranged, and the tunnel concrete pier column support is arranged; therefore, the side support intensity and support resistance of the retained tunnel are greatly enhanced, the influence of support pressure in two times of mining is effectively controlled. The method for retaining gob-side tunnel is particularly suitable for using in flexible mining faces of bottom plate and / or top plate.

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.