72results about How to "Flexible commutation" patented technology

The invention discloses a switch reversing device in an electric tool. The switch reversing device is quick in reversing and good in contact after reversing, and comprises a shell, wherein two pairs of terminals are arranged in the shell, a connecting wire at one end of one pair of terminals is perpendicular to a connecting wire at one end of the other pair of terminals, the distance between the end of each terminal and the foot of a perpendicular is equal, and a disc-shaped reversing shaft is respectively arranged on the same sides of the four terminals; two parallel reversing sheets for switching the on / off of the two pairs of terminals are arranged on a part of the reversing shaft positioned on one side of the terminals; a circle of positioning groove or positioning bulge is arranged on the outer wall of the reversing shaft along the circumferential direction; a positioning rib which is buckled in the positioning groove on the reversing shaft or two positioning separation blades which clamp the positioning bulge are arranged in the shell; and a reversing rod which drives the reversing shaft to rotate is arranged on the shell. The switch reversing device has the advantages that when the switch reversing device is rotated by using the disc-shaped reversing shafts, the distance between the ends of the four terminals can be reduced, so that the entire structure is more compact, and the reversing operation is flexible, quick and convenient.

The invention discloses a particle drilling method, and belongs to the technical field of oil gas drilling engineering. The particle drilling method comprises steps of particle injection and particle recovery. The particle drilling method is characterized in that a. a slurry and particles are injected in a well through an injection device in the step of particle injection; b. a mixture of particles, rock debris and the slurry returned from the well is drained into a magnet separator after passing pipes from a rotary control head on a derrick floor in the step of particle recovery, and the magnet separator sends separated particles into a storage tank, and sends separated rock debris and slurry into a slurry tank; and c. particles in the storage tank are injected into the well again to drill through the injection device, to form a drilling cycle. According to the particle drilling method, the mixture of particles, rock debris and the slurry returned from the well is directly drained into a magnet separator through an exit device at the well head, particles can be separated and stored, a problem in the prior art that a slurry may leak from a plurality of positions because rock debris and the slurry are directly pumped into a drilling crew vibrating screen can be solved, and the risk of environmental pollution can be greatly reduced.

The invention discloses a combined combination lock, which comprises an inner handle assembly, an outer handle assembly and a lock body, wherein: a clutch mechanism arranged on the outer handle assembly and a driving mechanism for driving the clutch mechanism are also included; the lock body includes a lock case, a lock The tongue and the linkage mechanism that drives the lock tongue to move; the outer handle component can selectively drive the linkage mechanism through the clutch mechanism; the inner handle component is connected with the linkage mechanism and can directly drive the linkage mechanism. The beneficial effects of the present invention are: the present invention combines the fingerprint coded lock and the button-type mechanical coded lock as the dual drive of the coded lock, which avoids the potential safety hazards brought by the traditional mechanical lock and improves the security of the coded lock. In addition, the present invention It is also equipped with a handle reversing mechanism, which is flexible to install; the linkage mechanism of the present invention cooperates with the double drive mechanism and the clutch mechanism to form a complete structure, which can well satisfy people's needs for anti-theft locks such as high safety, convenient and quick use, and flexible installation. various needs.

The invention provides a thread-cutting presser foot lifter for sewing machinery, belongs to the technical field of clothing manufacture equipment and solves the technical problems that, for instance,a thread-cutting presser foot lifter of existing sewing machinery has poor applicability. A screwing machine comprises a bottom plate, a presser foot rod arranged above the bottom plate and a presserfoot fixedly connected to the lower end of the presser foot rod; a thread cutting mechanism is also arranged right below the presser foot at the bottom of the bottom plate. The thread-cutting presserfoot lifter comprises a driving motor fixed to the bottom of the bottom plate and having two output shafts; the output shaft at one end of the driving motor is fixedly connected with a presser foot lift cam; a linkage is arranged above the bottom plate; the presser foot lift cam can drive the presser foot rod to rise through the linkage; the output shaft at the other end of the driving motor is fixedly connected with a thread-cutting cam; the thread-cutting cam can drive the thread cutting mechanism to do cutting motion. The thread-cutting presser foot lifter herein is widely applicable and reliable in performance.

The invention discloses a quick-drill pneumatic hard rock drill which comprises a host machine, an operating valve and a propulsion unit, which are independent of one another and are connected with one another. An air suction nozzle communicated with an air distribution valve is arranged on a base of the host machine; the air distribution valve is in a fin type structure and consists of a valve body, a valve block and a valve rod; a valve cavity is arranged inside the valve body and is respectively communicated with a front chamber and a back chamber of a cylinder body through left and right air passages; the seesaw-like valve block is installed in the valve cavity through the valve rod; under the action of air pressure, the two ends of the valve block can respectively close or open the left and right air passages to enable a piston rod to move with high frequency; and a rotating device is arranged on a machine head. According to the invention, a new fin type air distribution valve which is flexible in change-over is adopted, so the impact frequency is greatly improved. The rotating device realizes primary transmission by adopting worm-and-gear principle, the transmission ratio is big, and the transmission efficiency is high. The quick-drill pneumatic hard rock drill is small in size, light in weight and convenient to operate, and is applicable for various propulsion modes.