40results about How to "No inversion" patented technology

The invention provides an alternating current-direct current parallel system seamless switching control method based on VSC-HVDC. According to the method, the phase shift angle delta, relative to a voltage vector Uw of a wind power plant PCC point, of a voltage vector Us of a power grid connected with an alternating current circuit is adjusted by controlling a synchronous rotation angle theta of a VSC-HVDC wind power plant side convertor station so that active power transmitted by an alternating current power transmission circuit can be controlled, and the rest of the active power is completely absorbed by a VSC-HVDC power transmission system. As the phase position of the voltage of the wind power plant PCC point is controlled to be ahead of the phase position of the voltage of the alternating current power grid all the time, the current of the alternating current power transmission circuit will not turn over; when the alternating current circuit stops operating, any external signal does not need to be detected, the control mode of the VSC-HVDC wind power plant side convertor station does not need to be changed either, and when the alternating current-direct current parallel operation mode is converted into the operation mode that wind power has access to the VSC-HVDC independently, all wind power is absorbed automatically.

The invention discloses a combined ring with a replaceable ring surface. The combined ring comprises a ring body, a ring base integrally connected with the ring body and the ring surface movably connected with the ring base. A connecting column is arranged on the ring surface, and a stretchable fixing block is arranged on the connecting column; a sliding groove matched with the stretchable fixing block is formed in the ring base, at least one positioning groove is formed in the sliding groove, and the depth of the sliding groove is smaller than the maximum stretchable length of the stretchable fixing block; the depth of the positioning groove is larger than that of the sliding groove. According to the combined ring, as the connecting column arranged on the ring surface is combined with the sliding groove formed in the ring base in a sliding mode, flexible replacement of the ring surface is achieved; as the stretchable fixing block on the connecting column and the positioning groove in the sliding groove are buckled, fixing of the ring surface and the ring base is achieved; as the ring surface is rotated, the ring surface can be easily replaced, replacing is convenient and simple, buckling is firm, and slipping, losing and the like of the ring surface can be avoided.

The invention discloses a novel energy-saving elevator using a super capacitor. The novel energy-saving elevator comprises a cage, a traction device, an electric motor, and a control system; the control system comprises a direct current bus, a brake unit, an electric motor driving circuit, a charging circuit, a discharging circuit, and at least one super capacitor assembly; the charging circuit and the discharging circuit are connected with the super capacitor assembly through a direct current (DC) / DC bidirectional voltage converter; a sampling control driving module is used, and after operation, the voltage of the bus and the super capacitor are detected by using a pulse width modulation conversion control circuit, and voltage reduction charging and voltage raising discharging pulse-width modulation (PWM) control signals are output to the charging circuit and the discharging circuit; when the elevator reduces speed, ascends in an underloading way and descends in an overloading way, the electricity energy is stored by using the super capacitor assembly during electricity generation; and when the elevator runs, the super capacitor assembly release electricity energy to the motor, and by using direct current electricity energy stored on the super capacitor assembly, an emergency power supply is provided for the elevator through a DC / alternated current (AC) module.

The invention relates to a kind of structure changing of multithread embroidering machine, which can replace embroidering line color real time automatically and tangential, includes main drive shaft. There is handpiece more than one, ring tank under handpiece. Main drive shaft as said has driving mechanism, attached to running gear, the other end needle bar: the ring tank has ring framework. Thus, this invention is of proper designing, simple structure, convenient fixing, easy changing and preserving. It is no not reversaling, turning calm, improving work efficiency significantly, reducing labor intensity. It is of compact structure, good locking character. It can improve embroidering producing precision, change rolling to rotating. It greatly improves stability and consistency and embroidering precision, processing character, shorts production cycle, lows cost.

The invention discloses a combined ring with a replaceable ring surface. The combined ring comprises a ring body, a ring base integrally connected with the ring body and the ring surface movably connected with the ring base. A connecting column is arranged on the ring surface, and a stretchable fixing block is arranged on the connecting column; a sliding groove matched with the stretchable fixing block is formed in the ring base, at least one positioning groove is formed in the sliding groove, and the depth of the sliding groove is smaller than the maximum stretchable length of the stretchable fixing block; the depth of the positioning groove is larger than that of the sliding groove. According to the combined ring, as the connecting column arranged on the ring surface is combined with the sliding groove formed in the ring base in a sliding mode, flexible replacement of the ring surface is achieved; as the stretchable fixing block on the connecting column and the positioning groove in the sliding groove are buckled, fixing of the ring surface and the ring base is achieved; as the ring surface is rotated, the ring surface can be easily replaced, replacing is convenient and simple, buckling is firm, and slipping, losing and the like of the ring surface can be avoided.

The invention discloses an abrasion-proof composite solid wood floor. A transparent abrasion-proof layer is arranged on the surface layer of the composite solid wood floor, and is formed by dissolving nanoscale aluminium oxide in polyurethane coating and coating the mixed solution on the surface layer of the composite solid wood floor. The abrasion-proof composite solid wood floor has the advantages that when paint is coated on the traditional abrasion-proof layer, the abrasion-proof effect is realized by quantity accumulation, the paint needs to be painted repeatedly, and the surface blurring is caused; while according to the abrasion-proof composite solid wood floor disclosed by the invention, the nanoscale aluminium oxide (superhard metal) is uniformly dissolved in the polyurethane coating, the abrasion-proof standard can be reached by one-time coating, and the surface layer is transparent; the abrasion-proof effect of the surface layer can reach more than 6000 revolutions, and the service life of a product is longer than 30 years.

An overturnable scopper is composed of motor, worm-gear speed reducer and its holder fixed to swinging arm of robot, bevel gear A fixed to output shaft of speed reducer, rotary axle, bevel gear B fixed to said rotary axle, and scooper fixed to said rotary axle.

A kite spool belongs to the field of entertainment products. It is composed of spool, spool gear, spool ratchet, bearing, center shaft, support arm, strap ring, support arm handle, support arm handle shaft, pawl adjustment ring, belt groove, belt, threader, threading block, ratchet Claws, pawl shafts, extension springs, rocker arms, etc., one side of the reel is provided with a reel ratchet concentric with the reel, and the other side of the reel is provided with a reel gear concentric with the reel; The shaft hole runs through the spool ratchet, the spool and the spool gear; the spool is fixed on the central shaft through the cooperation of the spool shaft hole and a bearing; the end of the central shaft close to the spool ratchet is fixed on the support arm; the support arm is Hollow structure. The design of the overall structure of the kite spool is scientific and reasonable, which well solves the problems that the existing kite spool cannot quickly stop setting out the line and the process of taking up the line is laborious and the like during use.