67results about How to "Prevent lock phenomenon" patented technology

The invention discloses a magneto-rheological damper which damping force can be adjusted in two ways, wherein a cylinder is connected with an upper and a lower end covers, a piston rod is inserted in the steel cylinder through a sealing ring which is arranged on the end cover, a non-corrosive steel damping magnetic slab is mounted on two ends of a piston slab, a plurality of the piston slabs are provided and alternately sleeved on the piston rod with a magnetic core sleeve barrel, the end surface of each piston slab is summarily opened with two grooves along the axial direction, a permanent magnetic ring is inserted in the groove, and the outer lateral of a magnetic core sleeve barrel is winded with an excitation coil. The damper respectively realizes the largest output and the smallest output through adding with the forward current and the inverse current, not only guarantees the fail-safe (fail-safe) performance of the damper, but also effectively prevents the occurrence of locking phenomenon, on the other hand, the invention provides a novel design of a composite magnetic circuit, greatly simplifies the composite magnetic circuit structure when the permanent magnet and the excitation coil coexist, which is beneficial to the practical manufacture and installation of the damper.

The invention relates to the technical field of pipe fitting fixture, in particular to a light-typed pipe cutting chuck. The chuck comprises a master plate. The middle part of the master plate is provided with a through hole, wherein pipe fittings can penetrate through the through hole; a pneumatic clamp is arranged on the master plate, wherein the pneumatic clamp can hold the pipe fittings penetrating through the through hole. The pneumatic clamp comprises a plurality of pairs of clamp bars and a double hinged type clamping rod pneumatic drive mechanism which independently controls the same or opposite movement of each pair of the clamp bars. According to the light-typed pipe cutting chuck, through four connecting rods (double hinged type), the good synchronism of a first cylinder and a second cylinder can be ensured; the precision is greatly protected; most of materials of the light-typed pipe cutting chuck are aluminum materials, thus the weight is reduced at least 65% compared with the weight of the conventional structure using steel materials; the existing T-typed slot is replaced by a guide rod, thereby avoiding the phenomenon of the claw locking because of the dust accumulation in the T-typed slot; movable structures are all placed outside; the fault is judged easily; the maintenance is more convenient.

The invention relates to a star-shaped discharging valve with a protecting structure. The star-shaped discharging valve with the protecting structure comprises a shell, a rotor and a flange cover, wherein the rotor comprises a rotating shaft; a plurality of blades with U-shaped cross sections are arranged on the periphery of the rotating shaft; circular side plates are arranged at the left side and right side of each blade; an expansion sleeve matched with the rotating shaft is arranged in the center of each side plate; a buffering cavity is arranged between each side plate and the flange cover; a cylindrical inner protecting sleeve is arranged in the buffering cavity; a cylindrical upper protecting sleeve is arranged at the outer side of the inner protecting sleeve; a cylindrical lower protecting sleeve is arranged at the inner side of the inner protecting sleeve; a mounting hole matched with the rotating shaft is arranged in the center of the flange cover; and a shaft sleeve matched with the expansion sleeve is arranged at the outer side of the mounting hole. The star-shaped discharging valve with the protecting structure has the beneficial effects that dust and powdery materials on the discharging valve are convenient and fast to clean through matching of an air bag and a hairbrush layer under the multiple protection effect of a material blocking plate, the upper protecting sleeve, the lower protecting sleeve, the inner protecting sleeve and the shaft sleeve, the cleaning efficiency is high, the implementation effect is good, the rotor is prevented from being locked up, and the service life of equipment is prolonged.

The invention discloses a drill rod adopting a pangolin scale biomimetic structure. The drill rod comprises a rod body and hollow circular truncated cone units, wherein an inner cavity of each hollow circular truncated cone unit is cylindrical, bulged ridges and grooves are longitudinally formed in the outer circumference surface of each hollow circular truncated cone unit at intervals, the hollow circular truncated cone units are inlaid together end to end, tightly nested on the rod body and then fixed by glue. Compared with the prior art, the drill rod adopting the pangolin scale biomimetic structure can effectively prevent locking phenomenon of the drill rod during a drilling process of a soft coal seam, so that the drill rod is easy to retreat.

The invention discloses a unidirectional regulating sliding support device which comprises a bottom plate (1), wherein two groups of sliding rails are arranged on the bottom plate (1), each group of sliding rails comprises two mutually-parallel barrier strips, a sliding chute is formed between the barrier strips, supporters are arranged in each group of sliding rails, and a positioning sleeve (3) positioned between the two supporters is arranged on the bottom plate (1). The unidirectional regulating sliding support device also comprises a screw rod (4) with two sections of threads which are in an opposite direction, the screw rod (4) between the two sections of threads is sleeved in the positioning sleeve (3), two limiting rings (5) respectively positioned at two sides of the positioning sleeve (3) are arranged on the screw rod (4), two ends of the screw rod are respectively connected with the two supporters, and threaded holes matched with the threads of the screw rod (4) are arranged in the supporters. Through rotating the screw rod, the distance between the two supporters can be regulated, thus the supporters are matched with the type of a workpiece, and practical range is increased.

The invention discloses a coating material used for preventing locking of an engine crankshaft, and a preparation method and a usage method thereof. Raw materials of the coating material are composedof, by weight, PAG polyether base oil, modified plant-based synthetic ester oxidation sunflower seed oil, epoxy resin, organic molybdenum, tungsten disulfide powder, tungsten diselenide powder, graphite fluoride powder, polyphenyl, a flame retardant, an anti-wear agent, and an antioxidant. The coating material is applied to a crankshaft journal surface or / and a bearing surface between a crankshaftjournal and a bearing bush (tile), and can provide adequate lubrication under the condition that effective lubrication cannot be provided due to inferior quality of engine oil or adequate lubricationcannot be provided between a crankshaft and a connecting rod when engine oil reduces; and the coating material can withstand a protective coating that is extremely high in temperature, not easy to wash off and burned out, has excellent waterproof, rust proof, anti-corrosion and anti-fretting wear characteristics on metal parts, can form solid dry film lubrication in the environment above 200 DEGC, can play the role of lubricating and preventing metal sintering from being stuck at a temperature of up to 1400 DEG C, and effectively avoids occurrence of the phenomenon that dry friction is generated between the tile and the crankshaft to eventually lead to the locking between the crankshaft and the connecting rod.

The invention provides an anti-locking high-temperature seal butterfly valve and belongs to the technical field of seal butterfly valves. The anti-locking high-temperature seal butterfly valve is used for preventing the occurrence of high-temperature locking fault of a seal valve. According to the technical scheme, a valve body seal ring of the seal butterfly valve is located on the inner side of a valve body supporting seat, a plurality of locking bolts are arranged on the periphery of the valve body seal ring in the horizontal direction and connected with the valve body supporting seat, the contacting face between the valve body supporting seat and the valve body seal ring is provided with a directional pin, the directional pin is arranged in the diameter direction of the valve body seal ring, and a gap of 2-3 mm is formed between the outer circumferential face of the valve body seal ring and the inner circumferential face of the valve body seal ring. By means of the anti-locking high-temperature seal butterfly valve, the limitation of the temperature changes of the valve body on the dilatation of the valve body seal ring is eliminated, the influence of temperature rise dilatation on the valve sealing pair junction surface is also eliminated, the locking phenomenon of the seal butterfly valve is avoided, and meanwhile the valve can be in a good sealing state all the time. The anti-locking high-temperature seal butterfly valve has the advantages that the structure is simple, the design is reasonable, the problem that the fault of locking occurrence of the high-temperature seal butterfly valve in high-temperature working conditions is not solved for a long time is solved, and the economic benefit of enterprises is remarkably improved.

The invention relates to a pneumatic brake cylinder, an air brake device and a gap adjustment recognizing method. The pneumatic brake cylinder comprises a reset unit and a brake unit connected with the reset unit and is characterized in that a gap adjustment unit used for adjusting the brake gap is arranged between the reset unit and the brake unit and comprises a first adjustment module, a second adjustment module and an adjustment limiting module; the adjustment limiting module is arranged between the first adjustment module and the second adjustment module and comprises a limit spring and a limit base; and the limit spring is fixedly connected with the limit base and the first adjustment module so as to ensure that the size of the brake gap can be controlled within a certain range, the function of recognizing the gap adjustment size in the gap adjustment process is achieved, the locking phenomenon caused by extra adjustment is prevented, and the travelling safety is improved.

The invention discloses a clockwork energy storage assisting braking device. The clockwork energy storage assisting braking device comprises at least two telescopic braking devices and a braking bar, wherein a clockwork energy storage friction wheel is arranged at the end part of each of the telescopic braking devices, and comprises a friction wheel body; and a fixing shaft is arranged in each of the friction wheel bodies and is connected with the corresponding friction wheel body through a corresponding energy storage clockwork.

The invention discloses a drill rod adopting a pangolin scale biomimetic structure. The drill rod comprises a rod body and hollow circular truncated cone units, wherein an inner cavity of each hollow circular truncated cone unit is cylindrical, bulged ridges and grooves are longitudinally formed in the outer circumference surface of each hollow circular truncated cone unit at intervals, the hollow circular truncated cone units are inlaid together end to end, tightly nested on the rod body and then fixed by glue. Compared with the prior art, the drill rod adopting the pangolin scale biomimetic structure can effectively prevent locking phenomenon of the drill rod during a drilling process of a soft coal seam, so that the drill rod is easy to retreat.

The invention relates to a grinding device for a metal desktop and a method for using it, comprising a bracket, a surface grinding device and a side grinding device are slidably arranged on the support, and a Desktop fixing device, the desktop fixing device includes a driving motor, the driving motor is connected with a reducer, the output shaft of the reducer is connected with a slowing device, the output shaft of the slowing device is connected with a turntable, the desktop to be polished Place it on the turntable, use the surface grinding device and the side grinding device to grind the tabletop and the side of the tabletop respectively, when the grinding is completed and the turntable needs to stop rotating, turn on the slowing device on the tabletop fixing device to stop the turntable quickly, reducing Waiting time, improve work efficiency.

The invention relates to a pneumatic brake cylinder, an air brake device and a gap adjustment recognizing method. The pneumatic brake cylinder comprises a reset unit and a brake unit connected with the reset unit and is characterized in that a gap adjustment unit used for adjusting the brake gap is arranged between the reset unit and the brake unit and comprises a first adjustment module, a second adjustment module and an adjustment limiting module; the adjustment limiting module is arranged between the first adjustment module and the second adjustment module and comprises a limit spring and a limit base; and the limit spring is fixedly connected with the limit base and the first adjustment module so as to ensure that the size of the brake gap can be controlled within a certain range, the function of recognizing the gap adjustment size in the gap adjustment process is achieved, the locking phenomenon caused by extra adjustment is prevented, and the travelling safety is improved.