32results about How to "High normal stiffness" patented technology

The invention discloses a piezoelectric linear driver, which comprises a base and guide rail integrated mechanism and a driver clamping and stretching integrated structure. The base and guide rail integrated structure consists of a base and a guide rail which are integrally combined, the driver clamping and stretching integrated structure consists of an eight-rod flexible mechanism and is mounted on the base and guide rail integrated structure, a gap between a clamping block of the driver clamping and stretching integrated structure and a guide rail of the base and guide rail integrated mechanism can be adjusted by a fastening device, and the clamping block and the guide rail are pretensioned by the fastening device. The piezoelectric linear driver is simple in structure, assembling errors during assembling of too many parts can be avoided, and integral rigidity of the driver can be improved.

A hitch receiver apparatus for a vehicle is provided in which a hitch receiver is disposed without being directly connected with a rear back beam, such that the hitch receiver is kept in the rear back beam when not being used, and the hitch receiver protrudes down under the rear back beam when using the function of a trailer.

A steam turbine rotor blade has a profile and a cover integrally formed on and at an end of the profile, the leading edge of the cover formed on the profile and the trailing edge of a cover formed on an adjacent preceding profile being in contact and connected with each other by the torsional return force produced during rotation. The cover formed on the profile is provided with a radially-formed stepped portion at the trailing edge, the stepped portion having a height large than the thickness of the cover.

An electromechanical transducer includes multiple elements each including at least one cellular structure, the cellular structure including: a semiconductor substrate, a semiconductor diaphragm, and a supporting portion for supporting the diaphragm so that a gap is formed between one surface of the substrate and the diaphragm. The elements are separated from one another at separating locations of a semiconductor film including the diaphragm. Each of the elements includes in a through hole passing through a first insulating layer including the supporting portion and the semiconductor substrate: a conductor which is connected to the semiconductor film including the diaphragm; and a second insulating layer for insulating the conductor from the semiconductor substrate.

A coil spring of this invention includes a first end coil part with a first bearing surface facing to the first side in the axial direction, a second end coil part with a second bearing surface facing to the second side in the axial direction and a central coil part connecting the first and second end coil parts. A displacement length in the axial direction from the outer end portion until the inner end portion of the first end coil part is a thickness of a spring wire forming the coil spring so that a space between the outer end portion of the first end coil part and an inner end portion of the central coil part is zero, and a displacement length in the axial direction between the outer end portion of the first end coil part and a point away along the circumferential direction from the outer end portion toward the inner end portion of the first end coil part by a half of turn around the axial line is less than a half of the thickness of the spring wire.

The invention provides an off-axis reflector, and the reflector comprises a reflective surface, a back surface, a front surface, a back surface, a first side surface, and a second side surface. The reflective surface is opposite to the back surface, and the front surface is opposite to the back surface. The first side surface is opposite to the second side surface, and a first light weight hole layer is disposed between the first side surface and the second side surface. A second light weight hole layer is disposed between the front surface and the back surface. The reflector can obtain higherrigidity, and can effectively solve problems that a conventional reflector is long in processing period and is high in manufacturing cost and a long-strip off-axis reflector is low in rigidity. The invention also provides a processing method for the reflector, and the employs the modification technology for modifying the reflector. Optical processing is carried out on the surface of a modified layer, thereby improving the surface figure accuracy and surface cleanness of the reflector. The method can meet the requirements of visible light.

The invention discloses a piezoelectric linear driver, which comprises a base and guide rail integrated mechanism and a driver clamping and stretching integrated structure. The base and guide rail integrated structure consists of a base and a guide rail which are integrally combined, the driver clamping and stretching integrated structure consists of an eight-rod flexible mechanism and is mounted on the base and guide rail integrated structure, a gap between a clamping block of the driver clamping and stretching integrated structure and a guide rail of the base and guide rail integrated mechanism can be adjusted by a fastening device, and the clamping block and the guide rail are pretensioned by the fastening device. The piezoelectric linear driver is simple in structure, assembling errors during assembling of too many parts can be avoided, and integral rigidity of the driver can be improved.

The invention belongs to the technical field of large-span greenhouse space structural design in civil engineering and discloses a diagonal pull rod type single-layer spherical greenhouse latticed shell system and a design method thereof. The latticed shell system comprises a bidirectional lattice type single-layer spherical latticed shell, and diagonal pull rods are arranged at lattice diagonal positions in the bidirectional lattice type single-layer spherical latticed shell and / or outside the lattice shell surface. The design method includes: constructing a latticed shell structural model, and designing a diagonal pull rod scheme; adopting finite element software ANSYS for developing of a whole elastoplasticity analysis process to analyze influences of a pull rod arrangement form and prestress to an ultimate load of the spherical greenhouse latticed shell, and verifying and determining a structural design scheme of the diagonal pull rod type single-layer spherical greenhouse latticed shell system. By arrangement of the pull rods in the bidirectional lattice surface, internal rigidity of the structural surface is improved; by arrangement of the pull rods outside the lattice shell surface, external rigidity of the structural surface is improved, and the prestress in a certain range is applied to improve structural bearing capacity, and the structure has advantages of high light transmittance, low material consumption, high rigidity and the like.

The invention discloses a five-freedom-degree series-parallel lower limb rehabilitation robot, and belongs to the technical field of medical rehabilitation instruments. The five-freedom-degree series-parallel lower limb rehabilitation robot can achieve the attitude rotation around the X axis, the Y axis and the Z axis, conducts axial movement along the Y axis and the Z axis, and actually simulates multi-free-degree complex motions of human lower limb and foot walking. The five-freedom-degree series-parallel lower limb rehabilitation robot comprises a rack and two moving platforms, and a base and a support are connected in a series mode to form the rack. When a patient is in the early days of rehabilitation, the patient can keep balance with the help of a supporting frame and passively conduct rehabilitation trainings of lower limb joint motion. When the patient is in the later stage of rehabilitation, the patient can actively conduct the rehabilitation exercises of walking and the like with the help of handles frames, so that the rehabilitation trainings are more effectively and continuously provided for the patient. The five-freedom-degree series-parallel lower limb rehabilitation robot is comprehensive in functions, simple in structure, convenient to operate, and suitable for different training stages of different patients, so that the patient with lower limb walking function damaged can more effectively and continuously conduct the rehabilitation trainings.

A moving coil type self-driven maglev guide rail device and a control method thereof belong to the technical field of high-end equipment. Four guide sleeve support frames are combined to form a square sleeve, and the centers of the inner sides of the four guide sleeve support frames are respectively packaged with E-shaped components, and the coil windings are packaged on the inner side of the upper guide sleeve support frame, and are located One side of the component; four I-type electromagnets are respectively packaged on the four sides of the guide shaft support frame, the four I-type electromagnets are arranged opposite to the four E-type components, and the permanent magnets are packaged on the guide shaft support On the upper side of the frame, the permanent magnet and the coil winding are arranged oppositely; the bipolar electromagnet is E-type, and the two Hall elements are installed at the center of the two-stage pole faces of the bipolar electromagnet, and the induction coil is wound on the two-stage of the bipolar electromagnet. On the surface, the primary coil is wound on the surface of the two-stage induction coil of the bipolar electromagnet, and the eddy current sensor is installed at the center of the middle tooth of the bipolar electromagnet. The invention is used in ultra-precision systems.

The invention discloses a tangential self-excited vibration auxiliary dry grinding system and method. A grinding head system is mounted on a self-excited vibration plate. The self-excited vibration plate is fixed to a machine tool body through a cantilever. During machining, a grinding wheel of the grinding head system rotates to serve as an excitation source of the whole system, energy is input to the self-excited vibration plate, and the self-excited vibration plate drives the grinding head system to subjected to self-excited vibration, so that abrasive grains of the grinding wheel are made to make reciprocating componential movement at a certain frequency in the tangential direction of the grinding wheel relative to a workpiece while grinding the workpiece. By controlling the rotating speed of the grinding wheel, the quantity of input self-excited vibration energy can be adjusted; by analyzing and designing the inherent frequency and modal of the self-excited vibration plate, the frequency of a self-excited vibration system can be controlled; and the abrasive grains of the grinding wheel make contact with or are separated from the workpiece periodically, so that grinding heat is effectively dissipated, and the purposes of decreasing the grinding temperature and avoiding grinding burns are achieved.

The invention relates to a method for manufacturing a multi-pipe confluence node with an isosceles triangular cross-section, which belongs to the technical field of building steel structures. The operation steps are as follows: the first step: bending and forming a steel plate into a steel pipe, and the cross-sectional shape of the steel pipe is an isosceles triangle . Step 2: Take a solid steel rod at one end and grind both ends of the solid steel rod. Step 3: Take several inserting plates and weld them with solid steel rods in an equal-spaced circular distribution with the solid steel rods as the center. Step 4: Between two adjacent inserting plates, weld the steel pipe to the inserting plate in the opposite-side through-length manner, and finally polish the weld seam to make it smooth. It has the characteristics of simple structure, good stability and long service life. The problem of low stiffness of the connection nodes of the space-fabricated steel structure is solved.