91results about How to "Avoid abnormal wear and tear" patented technology

The invention relates to a tire tread (B) provided with a tread design formed of a number of relief elements (1, 10) delimited by grooves and / or incisions (2). This tread design comprises, on each of its sides, i.e. the axially outermost area of the tread, a circumferentially oriented edge rib (1) that is axially delimited on the inside by a groove (2) having the same general orientation and depth H. The tire tread also comprises, axially on the exterior of each edge rib (1), a rib (3) that is offset with regard to the outer contact surface (11) of the adjacent edge rib (1) by a distance d that is not equal to zero. Said offset rib (3) is separated from the edge rib (1) by a groove (4) of the same depth or nearly the depth H of groove (2) delimiting the edge rib (1). The tire tread is characterized in that it comprises, on each side where an offset rib (3) is formed, a number of channels (5) that open on the lateral faces of the tread. These channels (5) extend inside the tread until they open into the groove (4) between the offset rib (3) of the adjacent edge rib (1).

A paper roll slitter machine comprises a framework, a band saw machine, an intermittent paper feeding mechanism, a main driving mechanism and a control device. The intermittent paper feeding mechanism is arranged on the framework in such a manner that the intermittent paper feeding mechanism can longitudinally and horizontally slide, the main driving mechanism is arranged on the framework, is connected with the intermittent paper feeding mechanism and can drive the intermittent paper feeding mechanism to longitudinally and horizontally reciprocate, and the control device is respectively connected with the intermittent paper feeding mechanism, the band saw machine and the main driving mechanism; the intermittent paper feeding mechanism comprises a slide base, a groove and a belt pushing mechanism, the slide base is arranged on the framework in such a manner that the slide base can longitudinally and horizontally slide, the groove is transversely and horizontally arranged on the slide base and is used for accommodating a paper roll, and the belt pushing mechanism is transversely and horizontally arranged on the slide base and is used for intermittently pushing the paper roll in the groove to move forwards; the main driving mechanism comprises a transmission shaft, two crank and slider mechanisms and a second motor, the transmission shaft is transversely and horizontally arranged on the framework, the two crank and slider mechanisms are connected among two ends of the transmission shaft and the slide base, and the second motor is connected with the transmission shaft by a speed reducer and can drive the transmission shaft to rotate via the speed reducer; and a saw blade penetrates through the groove in an output section of the groove and can cut the paper roll when the intermittent paper feeding mechanism slides.

The invention discloses a shield tunneling construction method of a composite stratum; the method includes step 1, geological survey of composite stratum; step 2, selection of a shielding cutter according to the geological condition of the composite stratum; step 3, selection of shield tunneling construction mode according to the geological condition of the composite stratum; step 4, selection of shield tunneling parameter according to the geological condition of the composite stratum, wherein the step 4 includes step 401 of calculating push force of a shield tunneling machine; step 402 of calculating torque of the shield tunneling machine; step 5, shield tunneling construction, wherein the step 5 includes step 501 of feeding back the shield tunneling direction; step 502 of adjusting the shield tunneling direction. The shield tunneling construction method is simple in structure and reasonable in design; according to the change of the composite stratum, the method can reasonably select the shield tunneling machine, correctly select the tunneling parameter, prolong the service life of a cutter disk, improve the adaptation of the cutter disk to the composite stratum, and guarantee the safe, rapid and economic performance of the shield construction; thus the method is good in using effect and convenient to popularize and use.