Abstract: An electric swing is provided, which includes support frames, wherein fixing brackets are arranged at top ends of the support frames, a transmission shaft is arranged at ends of the fixing brackets in a sleeved manner, a power device is arranged at one end of the transmission shaft, fixing plates are arranged on the transmission shaft, and fixing assemblies are arranged on the fixing plates; each fixing assembly specifically comprises a rope, a fixing disc and two rope anchoring pins, wherein a T-bar is arranged on the fixing disc, the two rope anchoring pins are arranged symmetrically, the rope anchoring pins are located below the fixing plate and form a triangle together with the fixing disc, the rope is mounted on the fixing disc and located between the rope anchoring pins, and circular rings are fixedly arranged at two ends of a lower side of the T-bar.

Abstract: A cradle movement mechanism and a crib are provided. The cradle movement mechanism comprises a vertical movement mechanism, a horizontal rotation mechanism and a mounting base, wherein the vertical movement mechanism comprises a first driving member, a lead screw and a nut; the first driving member drives the lead screw to rotate forward and backward, so that the nut moves up and down along the lead screw to drive the mounting base fixed on the nut to move up and down; the horizontal rotation mechanism comprises a second driving member and a main rotor; the main rotor is fixedly connected with the vertical movement mechanism, and when the second driving member drives the main rotor to rotate, the vertical movement mechanism and the mounting base are driven to do a horizontal circular movement.

Abstract: An electric swing is provided, which includes support frames, wherein fixing brackets are arranged at top ends of the support frames, a transmission shaft is arranged at ends of the fixing brackets in a sleeved manner, a power device is arranged at one end of the transmission shaft, fixing plates are arranged on the transmission shaft, and fixing assemblies are arranged on the fixing plates; each fixing assembly specifically comprises a rope, a fixing disc and two rope anchoring pins, wherein a T-bar is arranged on the fixing disc, the two rope anchoring pins are arranged symmetrically, the rope anchoring pins are located below the fixing plate and form a triangle together with the fixing disc, the rope is mounted on the fixing disc and located between the rope anchoring pins, and circular rings are fixedly arranged at two ends of a lower side of the T-bar.

Abstract: A baby care device is disclosed, which comprises a base and a seat holder, wherein the base is connected to a base cover, a plane arc motion mechanism is arranged between the base cover and the base, and an output end of the plane arc motion mechanism is connected to a vertical lifting motion mechanism; a bottom end of the seat holder is connected to an output end of the vertical lifting motion mechanism, and a top end of the seat holder penetrates through the base cover to be connected to a rocking chair frame device; and the plane arc motion mechanism and the vertical lifting motion mechanism work to drive the rocking chair frame device to make three-dimensional combined movements.

Abstract: A swing control method is disclosed. Dual photoelectric sensors and gratings are involved. The method includes: detecting the time when blocked or opening parts of gratings pass through photoelectric sensors; comparing a minimum time value with a time value corresponding to a preset swing amplitude in each swing cycle, and when the minimum time value is not equal to the preset time value, generating a control signal for adjusting an output power of a motor so that the swing amplitude reaches the preset swing amplitude; detecting a current swing direction; and determining whether the current swing direction changes, and if yes, generating a control signal for adjusting the output power of the motor for co-direction supplementary augmentation. The method controls the swing speed of a swing by calculating a value of the time when the blocked or opening parts of the gratings pass through the photoelectric sensors.

Abstract: A swing control method is disclosed. Dual photoelectric sensors and gratings are involved. The method includes: detecting the time when blocked or opening parts of gratings pass through photoelectric sensors; comparing a minimum time value with a time value corresponding to a preset swing amplitude in each swing cycle, and when the minimum time value is not equal to the preset time value, generating a control signal for adjusting an output power of a motor so that the swing amplitude reaches the preset swing amplitude; detecting a current swing direction; and determining whether the current swing direction changes, and if yes, generating a control signal for adjusting the output power of the motor for co-direction supplementary augmentation. The method controls the swing speed of a swing by calculating a value of the time when the blocked or opening parts of the gratings pass through the photoelectric sensors.

Abstract: Disclosed is a swinging drive control apparatus, including a controller and a motor, where the controller detects a counter-electromotive force of the motor and drives the motor according to the detection result. Also disclosed is a corresponding method, including: measuring a counter-electromotive force of a motor in a previous cycle; and comparing a maximum counter-electromotive force value with a preset value, and calculating a PWM pulse duty factor in a next cycle. By directly detecting the counter-electromotive force of the motor without using a sensor, the present invention implements swinging frequency and phase tracking as well as swinging amplitude control, and simplifies a control system.

Abstract: Disclosed is a swinging drive control apparatus, including a controller and a motor, where the controller detects a counter-electromotive force of the motor and drives the motor according to the detection result. Also disclosed is a corresponding method, including: measuring a counter-electromotive force of a motor in a previous cycle; and comparing a maximum counter-electromotive force value with a preset value, and calculating a PWM pulse duty factor in a next cycle. By directly detecting the counter-electromotive force of the motor without using a sensor, the present invention implements swinging frequency and phase tracking as well as swinging amplitude control, and simplifies a control system.

Abstract: A superconducting magnet (10) generates a uniform, static magnetic field through a central bore (12) along its longitudinal or z-axis. An insertable coil assembly (40) is inserted into the bore with a radio frequency shield (76, 84) for providing a radio frequency shield between the insertable coil assembly and a surrounding, whole body radio frequency coil assembly (32) and a whole body gradient magnetic field coil assembly (30). The insertable coil includes a gradient coil (44a) including conductors (52) mounted on a dielectric former (50) with a dielectric constant below 4.0. The conductors are relatively narrow and spaced relatively far apart to minimize capacitive coupling with a closely adjacent insertable radio frequency coil (70a). Filters (60, 64) are connected with the conductors of the gradient coil to prevent the gradient coil conductors from supporting radio frequency signals while permitting ready support of kHz frequency currents.

Abstract: A magnetic resonance imaging apparatus includes a magnet assembly (10) for generating a temporally constant primary magnetic field through a central bore (14). The central bore is surrounded by a gradient coil assembly (30) including a dielectric former (32) and gradient coils (34, 36, 38) for generating magnetic field gradient pulses across the examination region. A radio frequency coil assembly (50) including a birdcage coil (52) is mounted inside of the gradient coil assembly and surrounding the examination region. A radio frequency shield (60) includes a dielectric sheet (62) having a plurality of first metal foil strips (72) defined on each surface. The metal strips are defined by etching or cutting gaps (70) in a continuous sheet of copper foil, leaving bridges (74) across the gaps adjacent opposite ends of the foil strips.

Abstract: A primary gradient coil assembly (22) is mounted in the inner bore or cylinder (20) of a vacuum dewar (18) that surrounds a superconducting magnet assembly (10). A pair of end ring assemblies, such as electrically conductive lapped segment loops (38) are supported by the gradient coil assembly (22). The end ring segments are capacitively coupled. A plurality of removable radio frequency coil element assemblies (40) are selectively attached to and detached from the gradient coil assembly. Each of the removable RF coil element assembly includes a dielectric housing (50), a longitudinally extending conductor element (52), an electrical connector (44), and circuit components (54) which connects the longitudinal conductor element with the electrical connector. The connector is electrically connected, at radio frequencies, with the ring assembly (38). A mechanical interlock (60) mechanically locks and selectively releases the removable element assemblies (40) to the gradient coil assembly.

Abstract: The magnetic field assembly of a magnetic resonance imaging device includes an annular superconducting magnet (10) which is mounted within a toroidal vacuum vessel (24). A cylindrical member (26) defines a central bore through which the superconducting magnets generate a temporally constant primary magnetic field. A cylindrical, dielectric former (46) is mounted in the bore displaced a small distance from the cylindrical member. A radio frequency coil (32) is mounted within the cylindrical member defining a patient receiving examination region. An RF shield (34) is mounted around the exterior peripheral surface of the former. Primary gradient coils (40) are mounted around and potted to the exterior of the dielectric former around the RF shield. Gradient shield or secondary coils (44) are potted around an exterior of the cylindrical member within the vacuum chamber. As illustrated in FIG.

Abstract: Superconducting magnets (10) of a magnetic resonance imager create static magnetic fields through an examination region (12). Gradient magnetic field coils (30) under control of a gradient magnetic field control (42) generate gradient magnetic fields across the examination region (12), as a whole. A plurality of surface coils (36, 38) receive radio frequency signals from each of two distinct subregions within the examination region (12). The two receiver coils are connected with separate receivers (60.sub.1, 60.sub.2) which demodulate the received magnetic resonance signals. The magnetic resonance signals are reconstructed (76) into an image representation (80, 82) of the first and second subregions. In the embodiment of FIGS. 1 and 2, a radio frequency transmitter (40) and a whole body coil (32) generate and manipulate the magnetic resonance signals within the first and second subregions. In the embodiment of FIGS. 3 and 4, a plurality of transmitters (40.sub.1, 40.sub.2, . . .

Abstract: In a magnetic resonance system, four primary loop circuits (50, 52, 54, 56) are inductively coupled to a resonator coil (32) at 90.degree. intervals around its circumference. The loop circuits are over-coupled to the resonator coil, i.e. they present more than the characteristic resistance of the associated cabling system which causes the maximum current transfer between the loop circuits and the resonator coil to be offset (f.sub.N) in equal amounts in each direction from a natural resonance frequency (f.sub.0) of the resonator coil. In one embodiment, two adjacent primary loop circuits provide for quadrature radio frequency transmission to and from the resonator coil at a first frequency and the other two primary loop circuits provide for quadrature radio frequency transmission to and from the resonator coil at a second resonance frequency. Each of the primary loop circuits includes a tank circuit (62) for blocking the passage of the frequency of the other quadrature primary loop circuit pair.

Abstract: A superconducting magnet (10) generates a uniform, static magnetic field through a central bore (12) along its longitudinal or z-axis. A biplanar gradient coil assembly (44) is inserted into the bore to create gradients across the static magnetic field along orthogonal x, y, and z-axes. A biplanar radio frequency coil assembly (50, 80) is inserted into the bore for transmitting radio frequency signals into a subject and receiving magnetic resonance signals from the subject. The radio frequency coil includes a first biplanar coil assembly (50) for generating RF signals in an x-direction and a second biplanar coil assembly (80) for generating RF signals in a y-direction. The two biplanar coil assemblies each include a plurality of conductors (52, 82) along a first plane and a second plurality of conductors (54, 84) along a parallel second plane. The conductors extend parallel to the z-direction.