39results about How to "High static stiffness" patented technology

The invention discloses a quasi zero stiffness vibration isolator using multilayer squeezing type magnetic spring and oscillating bars. The vibration isolator comprises a main shaft, guiding shafts, the oscillating bars and a multiplayer structure; the multilayer structure comprises an upper roof arranged from top to bottom in sequence, an upper end cover, a negative stiffness unit, a lower end cover, positive stiffness unit and a bottom plate; the main shaft is a center shaft with multilayer structure; the guiding shafts and the oscillating bars are multiple, and are all arranged around the main shaft at fixing intervals; the structure is compact, and has more bearing ability under relatively small size. In addition, the negative stiffness unit and the positive stiffness unit are connected in parallel by the vibration isolator using the principle of magnetic negative stiffness; the vibration isolator has the characteristics of high static stiffness and low dynamic stiffness, the inherent frequency of the vibration isolator can be efficiently reduced, the vibration isolation frequency band is widened, and the vibration isolator is suitable for low frequency vibration isolation; thenegative stiffness unit is in the form of multilayer squeezing type magnetic spring, the stronger magnetic induction intensity can be produced, the negative stiffness of magnetic spring is increased,the negative stiffness unit is suitable for high loading occasion, and a wide range of applications is met.

The invention relates to a vertical machining center, in particular to a high-rigidity large-torque vertical machining center. The machining center mainly solves the technical problems that high-grade and low-grade reduction boxes are high in price, high speed gears operate in ultimate states, the failure rate is high, the use and maintenance costs are high, the machining requirements of other reduction ratios such as 1:2/1:3 cannot be met, the rigidity of a spindle is poor, and the tool changing failure frequency is high in vertical machining in the prior art. The machining center comprises a honeycomb type bed, wherein a double-layer ribbed carriage and a workbench are arranged on the honeycomb type bed; a herringbone frame upright is also arranged on the bed and connected with a spindle box by a guide rail in a sliding manner; a ball screw is arranged on the herringbone frame upright; the spindle box is in threaded connection with the ball screw; a tool magazine and an unclamping cylinder is arranged on the spindle box; the spindle box is internally provided with a 1:2/1:4/1:8 speed reducer; a spindle location device is arranged on a spindle of the spindle box; and the vertical machining center is provided with an electric and numerical control system.

The invention relates to the technical field of structural vibration control and discloses a vibration isolator. The vibration isolator comprises a steel plate spring, a first air spring, a second air spring, a foundation and a device waiting vibration isolation, wherein the first air spring and the second air spring are horizontally arranged and are located on the two sides of the device waiting vibration isolation, and the two ends of each of the first air spring and the second air spring are hinged to the foundation and the device waiting vibration isolation respectively through bolts; the two air springs provide non-linear restoring force and damping force for the device waiting vibration isolation and guarantee that the device waiting vibration isolation moves in the vertical direction; the steel plate spring is horizontally arranged and provides linear and elastic support for the device waiting vibration isolation, and the two ends of the steel plate spring are fixedly connected to the device waiting vibration isolation and the foundation respectively through bolts. The vibration isolator has the advantages that the static deformation can be effectively reduced, and therefore the static rigidity can be improved, and the stability of a system can be improved; the inherent frequency of the system can be effectively lowered, and therefore the vibration isolation area can be expanded, and the vibration isolation efficiency can be improved; the transmissibility of a resonance region and a vibration isolation region can be simultaneously and effectively lowered, and therefore the vibration isolation effect of the vibration isolator can be improved.

The invention relates to a machining center, and in particular to a gantry machining center with high rigidity and large torque. The gantry machining center mainly solves the technical problems existing in the prior art that a high-low gear reduction gearbox is expensive, a high speed gear works in the limiting condition, the failure rate is high, and the cost of using and maintenance is high; requirements of processing at the reduction ratio of 1:2/1:3, and the like cannot be satisfied; the rigidity of a main shaft of a vertical processing is bad, tool changing failure frequency is high, and the like. The gantry machining center comprises a lathe bed, wherein the lathe bed is provided with a vertical column and a working table; a cross beam is arranged at the upper end of the vertical column; a tool magazine is arranged at one end of the cross beam; the cross beam is provided with a cross beam guide rail, a sliding saddle is slidably connected with the cross beam; the sliding saddle is provided with a ram of a high rigid guide rail structure; the ram is provided with the main shaft and a tool hitting cylinder; the main shaft is connected with a main motor through a reducing gear with wheels; the main shaft is further provided with a main shaft positioning device; the gantry machining center is provided with an electrical and numerical control system.

The invention relates to the machining field of steel strips, in particular to a boring tool holder of a combined machining machine special for drum shafts. The boring tool holder comprises a main boring shaft, a ram and a ram feed assembly; a boring tool is installed on the main boring shaft and located through conical holes, and an end-face key transmits torque; the main boring shaft is installed in the ram, and the ram is fed through the ram feed assembly installed below the ram. According to the scheme, the behavior errors of machined work-pieces are reduced, and the surface accuracy is improved.

The invention belongs to the field of electro-hydraulic control, and discloses a state parameter obtaining device used for an electro-hydraulic servo control system. The state parameter obtaining device comprises an acceleration sensor, a position speed sensor, a position giving controller, a position controller, a first-order differential controller, a second-order differential controller, a third-order differential controller, a speed controller, an acceleration controller and a system controller. The state parameter obtaining device performs real-time online acquisition on six state parameters which are displacement, speed, acceleration, displacement deviation, speed deviation and acceleration deviation of the electro-hydraulic servo system, and provides state parameters for the systemcontroller, and the system controller outputs a control signal to drive a hydraulic performing unit to work to improve control performance of the electro-hydraulic servo system according to differentcontrol strategies. The state parameter obtaining device is suitable for realizing controlling various electromechanical-hydraulic cooperative control systems through various state parameters.

The invention discloses a shape memory alloy based impact load retarding device. The shape memory alloy based impact load retarding device comprises a shape memory alloy gasket, a shape memory alloy sleeve and a connector. The shape memory alloy sleeve is arranged between an upper connecting piece to be subjected to vibration attenuation and a lower connecting piece to be subjected to vibration attenuation. The connector comprises a nut and a connecting rod. The shape memory alloy gasket is used for being arranged on the upper connecting piece. One end of a rod body of the connecting rod is provided with a cap body. The rod body penetrates through the upper connecting piece, the sleeve, the lower connecting piece and the shape memory alloy gasket in sequence. The other end of the rod bodyis in threaded connection with the nut. The shape memory alloy gasket and the shape memory alloy sleeve are both in a martensite phase transformation critical stress state by tightening the nut. The invention further discloses an impact load retarding method of the shape memory alloy based impact load retarding device. Through the impact load retarding method, the assembly tightness of the upper connecting piece, the lower connecting piece and the connector is ensured, impact and vibration between the upper connecting piece and the lower connecting piece are reduced. Moreover, the shape memoryalloy based impact load retarding device is simple in structure and easy to dismantle.

The present invention provides a device for winding a web of a material on a winding roll (5), comprising at least at least one roller (2, 3), wherein the roll abuts against the roller when winding and enables the roller to rotate when winding, the roller (2, 3) is supported in a bearing apparatus by bearings (7, 8) at end portion of each roller. It is also desired to wind the vibration-critical web of material with as fewer problems as possible. Therefore, it is determined that the bearings (7, 8) are provided with a liquid static pressure bearing with at least one first bearing oil chamber (12) supplied by a hydraulic liquid.

The invention discloses a suspension assembly for a vehicle, comprising: a front common bracket; Speed reducer suspension, the speed reducer suspension is arranged on the front common bracket; Motor suspension, the motor suspension is arranged on the front common bracket and is spaced apart from the speed reducer suspension; A left suspension and a right suspension, the left suspension and the right suspension being arranged at the left and right ends of the front common bracket, respectively, and the speed reducer mount and the motor mount being positioned between the left suspension and theright suspension, the left suspension and the right suspension being adapted to be connected with the left and the right longitudinal beams of the vehicle, respectively; And a rear bracket adapted tobe secured to a subframe of the vehicle, the rear bracket being provided with a rear suspension, wherein the reducer mount, the motor mount and the rear mount are used for mounting a powertrain of thevehicle. A suspension assembly for a vehicle accord to an embodiment of that present invention integrally mounts a plurality of suspension on a front common bracket, facilitates assembly, and enablessecondary shock absorption.

The invention discloses a boom assembly for a washing machine and a pulsator washing machine. The boom assembly for a washing machine includes a boom and a spring damping assembly. The spring dampingassembly includes an upper bracket, a spring and a lower bracket disposed on the boom, and further includes a magnetic assembly including a first magnet and a second magnet mutually generating magnetic forces. The first magnet is disposed on the boom. The second magnet is movable relative to the boom. Vibration absorbing performance of the boom assembly for the washing machine is realized, so as to improve use reliability and user experience of the pulsator washing machine.

A composition for coating steel belts used in constructing a radial medium truck (RMT) tire, having improved tensile strength and modulus retention, increased dynamic stiffness, increased fracture and tear resistance, and improved reversion resistance.

The invention discloses a two-stage vibration isolation buffer, and belongs to the technical field of vibration isolation buffers. The problems that an existing vibration isolation buffer is low in energy conversion rate and longitudinal impact resistance are solved. The lower portion of a connecting end cover is arranged between two cylinder bodies and fixedly connected with the second-stage cylinder body, the upper portion of the connecting end cover is inserted into the first-stage cylinder body and fixedly connected with the inner wall of the first-stage cylinder body, a piston is arrangedin the first-stage cylinder body in an up-down sliding mode, and the upper portion of the piston penetrates through the first-stage cylinder body and is fixedly connected with a guide cylinder; and acomposite membrane is fixedly clamped between the connecting end cover and the second-stage cylinder body and attached to the inner wall of the connecting end cover, the upper surface of the middle of the composite membrane is attached to the bottom of the piston, and the composite membrane, the connecting end cover and the first-stage cylinder body form a closed first-stage cavity. Two closed cavities which are isolated from each other are formed, energy consumption and energy storage are achieved at the same time, and on the basis of a molecular spring, the problem that low inherent frequency and small static deformation cannot be achieved at the same time under heavy loads is solved in combination with the working principle of the energy consumption type vibration isolation buffer.

The invention discloses a preparation method of an anti-fatigue composite material plate spring. The preparation method comprises the steps of preparing modified S-type glass fibers, modifying epoxy resin and preparing the plate spring. The prepared composite material plate spring is high in strength, the tensile strength ranges from 1647 MPa to 1655 MPa, the compression strength ranges from 1269 MPa to 1278 MPa, and the bending strength ranges from 2251 MPa to 2267 MPa; the prepared composite material plate spring is long in fatigue life, and the fatigue life is 315,000-322,000 times.