110results about How to "Convenient preload" patented technology

The present invention relates to finger driving mechanism of robot, and is especially wire coupled finger driving mechanism of skillful robot hand. The wire coupled finger driving mechanism has one first wire piece and one second wire piece twisted separately on the first joint wire wheel and the second joint wire wheel and crossed to form one 8 figure shape, one wire clamping board inserted in the first groove, one first steel ball mounted inside the first pretension device, one second steel ball mounted inside the wire clamping board, one third steel ball mounted inside the second pretension device, and one fourth steel ball mounted inside the wire clamping board. The present invention realizes the coupling motion of two finger joints in the same direction and the same angle, and has the advantages of high simple structure, convenient pretension, high reliability, etc.

The invention discloses a novel stress corrosion test specimen and an experiment method thereof. The test specimen is in a rectangular flat plate shape, and the plate-shaped test specimen is cut and formed in one step by a line cutting method. The method comprises the following steps: step 1. preparing the test specimen for getting ready to do the displacement deformation stretching stress corrosion experiment of the stress corrosion crack test; step 2. preparing 42 percent of MgCl2 solution and NaCl/NaOH mixed solution; step 3. building an experiment device, and placing the prepared test specimen into the experiment environment for carrying out stress corrosion experiment until the test specimen has corrosion cracks; and step 4. taking the test specimen for carrying out gold phase observation, finding the crack initialization position, and carrying out statistical analysis on the two-phase stainless steel stress corrosion mechanism. The processing of the test specimen of the invention is very convenient, and can be completed through one-step processing by line cutting in existence of plate-shaped test blocks.

The invention discloses a multi-layer bubbled foil radial dynamic pressure gas bearing, which comprises a bearing block and a shaft which is arranged in the bearing block, wherein the inner side of the bearing block is provided with an elastic supporting component; the elastic supporting component comprises multi-layer elastic bubbled elements arranged on the inner side of the bearing block and a top flat foil arranged between the elastic bubbled elements and the shaft; the top flat foil is attached to the elastic bubbled elements; a shell-shaped bulge with a continuous surface fillet is arranged on each layer of elastic bubbled elements; and one end of the elastic supporting component is fixed on the bearing block through a positioning element, and the other end of the elastic supporting component is free. The multi-layer bubbled foil radial dynamic pressure gas bearing is novel in structure, can generate timely and effective deformation, has adjustable local and integral rigidity and damping height, and has high load adaptability and excellent stability.

A digital phase-locked loop (PLL) device includes a digital loop filter which is provided with both a VCO-loop output and a DCO-loop output. The VCO-loop output is connected to an analog input of a multiband voltage-controlled oscillator (VCO) module for allowing usual operation of the PLL with a direct voltage acting as feedback parameter. The DCO-loop output is connected to a digital control input of the multiband VCO module for allowing automatic frequency range selection. A code value which is produced by the digital loop filter acts as feedback parameter during the frequency range selection. Rapid and precise range selection can thus be performed.

The invention relates to a method and a device for determining the optimal pretension quantity of a sphere and cone mixed double-line hub bearing, and belongs to the technical field of bearing design. The method comprises the steps: formulating a load spectrum of a sphere and cone mixed double-line hub bearing unit; calculating radial displacement delta r, axial displacement delta a and angle displacement theta according to a mechanical model of the sphere and cone mixed double-line hub bearing; obtaining corresponding single-line ferrule life and comprehensive life of the hub bearing unit by taking the load spectrum as a known condition and pretension quantity as analysis variable; and establishing a relationship between the pretension quantity and the life of the hub bearing unit and taking the pretension quantity, corresponding to the longest life of the single-line ferrule of the hub bearing unit and/or the whole hub bearing unit, as the optimal pretension quantity. By the method for determining the optimal pretension quantity of the sphere and cone mixed double-line hub bearing based on the load spectrum, which is provided by the invention, the optimal pretension quantity of the sphere and cone mixed double-line hub bearing unit during assembling can be obtained accurately.

The invention discloses a linear ultrasonic motor stator and an electric excitation method thereof. The stator comprises a stator elastic body and piezoelectric ceramic pieces, wherein an open slot isformed in the stator elastic body along the length direction, and the stator elastic body is divided into a driving body and two symmetrical driving legs by the open slot; the piezoelectric ceramic pieces in axial symmetry are attached to the two opposite outer side surfaces of the two driving legs, and driving feet extending outwards are arranged at the upper ends of the two driving legs respectively; and the piezoelectric ceramic pieces are coated with an electrode layer. The electric excitation method comprises the steps of 1) bonding the piezoelectric ceramic pieces; 2) preparing electrifying electrodes; and 3) simultaneously exciting local second-order bending vibration of the driving legs and overall first-order longitudinal vibration of the stator twice by using two paths of same-frequency sinusoidal voltage signals, and finally realizing forward and reverse movement of a driving rotor. According to the invention, the local second-order bending vibration of the two driving legsof the stator and overall first-order longitudinal vibration of the stator are combined and degenerate, and elliptical vibration of the driving feet is achieved.

The invention discloses a shock absorption performance improved punching device. The punching device comprises a punching frame, a hydraulic cylinder fixing seat, a hydraulic cylinder, a top plate, a male die, a female die and guide posts. A punching column is mounted under the male die. The lower portion of the punching column is detachably provided with a punching head through threads. The lower end of a bottom plate of the punching frame is provided with four telescopic rods. Each telescopic rod is sleeved with a damping spring A. The bottom ends of the four telescopic rods are mounted on the upper surface of a supporting plate body. An elastic plate body is arranged under the supporting plate body. The supporting plate body and the elastic plate body are arranged in parallel. The lower surface of the supporting plate body is fixedly provided with a plurality of spring seat bodies A. The upper surface of the elastic plate body is fixedly provided with a plurality of spring seat bodies B. The spring seat bodies A and the spring seat bodies B are in one-to-one correspondence. Damping springs B are mounted between the spring seat bodies A and the corresponding spring seat bodies B.

The invention relates to an inertial rotation piezoelectric motor. The inertial rotation piezoelectric motor comprises a base, a rotor mechanism and a pretightening mechanism, wherein the base comprises a quadrangular prism and a cantilever-shaped mounting pipe; the rotor mechanism comprises a rotor, a mounting plate, a pair of piezoelectric plates and a pair of mass blocks, the piezoelectric plates are fixedly arranged on the two side surfaces of the middle part of the mounting plate respectively, and the mass blocks are fixedly arranged on the two side surfaces of the upper part of the mounting plate; the pretightening mechanism comprises a pretightening shaft, a screw and a spring; in working hours, an electric signal with corresponding frequency is applied onto the piezoelectric plates, the mounting plate begins to swing, due to the existence of a flexible hinge, the mounting plate is of micro deflection around the flexible hinge, under the effect of the mass blocks, alternating conversion states of clamping and loosening appear, and the inertial rotation piezoelectric motor integrally rotates at a micro angle theta in the loosening state; and one-way rotational motion of the inertial rotation piezoelectric motor is realized through continuous motion. The friction loss during working is low, and the motion efficiency is improved by 5% to 10%.

The invention discloses a date-pit-type composite anti-collision system for a pier and a construction method for the date-pit-type composite anti-collision system for the pier. The composite anti-collision system comprises a prepressing-type anti-collision device which is arranged at the outer side of the pier, and a floating-type external retaining device which sleeves the outer side of the prepressing-type anti-collision device, wherein the floating-type external retaining device is in a date pit shape, and is formed by connecting a plurality of anti-collision boxes which float on the water surface; the prepressing-type anti-collision device comprises one or a plurality of date-pit-type anti-collision structures; each date-pit-type anti-collision structure comprises an external cofferdam, and an energy consumption layer which is arranged at the inner side of the external cofferdam and is composed of a plurality of energy consumption rings; each external cofferdam is in the date pit shape; each energy consumption ring comprises an elastic ring which is formed through prepressing, and an external protective sleeve which sleeves the outer side of the elastic ring. The construction method comprises the following steps of (1) building a horizontal construction platform; (2) conveying parts in place; (3) constructing fixing elements at the outer side of the pier; (4) constructing the prepressing-type anti-collision device; (5) constructing the floating-type external retaining device. The date-pit-type composite anti-collision system for the pier and the construction method for the date-pit-type composite anti-collision system for the pier have the advantages that the design is reasonable, the construction is simple and convenient, the use effect is good, and the pier can be effectively protected.

The invention relates to the technical field of wind driven generator foundation structures, and discloses an annular prefabricated assembly beam plate type fan foundation which is characterized in that an annular prefabricated assembly beam plate type fan foundation cushion layer is poured at the bottom of a corresponding area of a wind driven generator foundation; the annular structure is formed by annularly distributing a plurality of precast beam and slab units, the annular structure is arranged above the cushion layer, the annular structure and the cushion layer are in filling connection through a bottom grouting body, and any two adjacent precast beam and slab units are in filling connection through an abutted seam grouting body; the annular prestressed cable is arranged on the outer side of the annular structure in a surrounding mode, and the annular prestressed cable is tightly attached to the outer side of the annular structure and tensioned; and the anchor bolt assemblies are arranged on the precast beam and slab units respectively and used for being connected with a bottom flange of the fan tower drum. The overall strength of the assembly type fan foundation can be improved, and the shock resistance of the fan foundation is improved. Meanwhile, the invention further provides an installation method of the annular prefabricated assembly beam plate type draught fan foundation.

The invention discloses a construction method of a large-span continuous beam closely next to an existing line deep water foundation. The large-span continuous beam to be constructed is a reinforced concrete box beam located on one side of an existing railway line, and is formed by splicing two side-span beam segments, a middle-span beam segment and two pier top beam segments. The construction method of the large-span continuous beam to be constructed comprises the steps that 1, bridge piers are constructed; 2, the pier top beam segments are constructed, specifically, pier top brackets are installed and pre-pressed, formworks are erected on the pier tops, and concrete is poured to the pier top beam segments; and 3, side-span and middle-span closure construction is carried out, specifically, after construction of the two pier top beam segments is completed, closure construction is carried out on the middle-span beam segment and the two side-span beam segments through a hanging basket. According to the method, the steps are simple, design is reasonable, construction is easy and convenient, the using effect is good, construction of the large-span continuous beam closely next to the existing line deep water foundation can be completed easily, conveniently and quickly, and the construction process is safe and reliable.

The invention discloses a novel vertical numerical control turning and grinding composite machine tool. The novel vertical numerical control turning and grinding composite machine tool comprises a base and an alternating current servo motor, wherein the top end of the base is provided with a workbench, the upper surface of the base is provided with a stand column, the alternating current servo motor is arranged on the outer side of a protective shell, the tail end of a rotating shaft is connected with a coupler, the tail end of the coupler is connected with a transmission lead screw, and the front side of a cross beam is sequentially provided with a grinding tool rest and a turning tool rest from left to right. The novel vertical numerical control turning and grinding composite machine tool is convenient to install, can conveniently adjust the pretightening of an X-axis screw rod and a Z-axis screw rod, can increase the rigidity of the screw rods, saves the occupied area, improves theautomation degree, improves the depth of a ground inner hole, increases the range of the ground inner hole, reduces the vibration of a grinding wheel in the grinding process, accordingly improves thegrinding precision, has the characteristics of high positioning precision, stability, reliability, compact structure and the like and can ensure normal work of a spindle under the conditions of largecutting depth and large feeding.

The present invention discloses a non-woven cloth pre-pressing conveying device. The device comprises a conveying belt, first lifting brackets, driving guide rollers, auxiliary pressing rollers, a driving pressing roller, a second lifting bracket, a transmission bracket, a rack, a speed reduction motor and a supporting frame, wherein the left and right sides of the bottom of the conveying belt areprovided with supporting legs, a connecting plate is arranged between the supporting plates, the left side and the right side of the connecting plate are provided with the first lifting brackets, thetops of the first lifting brackets are provided with the driving guide rollers, the auxiliary pressing rollers are arranged above the driving guide rollers, the auxiliary pressing rollers are arranged on the left side and the right side of the bottom of the transmission bracket, and the second lifting bracket is arranged at the lower part of the middle of the transmission bracket and is connectedwith the driving pressing roller. The device is simple in structure; by arranging the multiple driving guide rollers, the auxiliary pressing rollers and the driving pressing roller, non-woven cloth is convenient to pre-press, and working positions of the driving guide rollers, the auxiliary pressing rollers and the driving pressing roller can be adjusted according to the requirements to better perform the required pre-pressing work so as to achieve the required working effect and improve the product quality.

The invention relates to the alloy die casting technology field, and discloses an alloy die casting clamping device capable of preventing offsetting. The alloy die casting clamping device capable of preventing offsetting comprises a bottom seat and a U-shaped support frame, wherein a support seat is fixedly connected with the middle of the upper end of the bottom seat, two clamping rods verticallyarranged are arranged on the left side and the right side of the support seat, arc rods are fixedly connected with upper ends of rod walls on two opposite sides of the two clamping rods, sliding blocks are fixedly connected with lower ends of the two clamping rods, sliding chutes matched with the sliding blocks are formed in the left side and the right side of the upper end of the bottom seat, abidirectional threaded rod transversely arranged is rotatably inserted into the support seat through a rolling bearing, the two clamping rods respectively run through the left end and the right end ofthe bidirectional threaded rod, and the left end and the right end of the bidirectional threaded rod are connected with the two clamping rods through threads. The alloy die casting clamping device capable of preventing offsetting can apply multidirectional force to alloy pending for die casting so as to clamp the alloy, enables the position of the alloy to correspond to the position of a die casting head, can perform pre-compression on the peripherical edge of the alloy in the die casting, and prevents the alloy from offsetting in the die casting.

The invention relates to a material outboard annular inspection device with a cable arrangement function, and the device comprises an installation platform which is provided with a steel belt drivingmechanism, wherein the peripheral side of the installation platform is provided with an annular groove for accommodating a cable; an annular steel belt which is driven by the steel belt driving mechanism to do annular motion around the peripheral side of the mounting platform; an annular guide rail which is annularly arranged around the installation platform; a bearing sliding block which is usedfor bearing an annular inspection mechanism, is connected to the annular steel belt and is arranged on the annular guide rail in a sliding manner; and a cable telescopic device which is mounted on theinstallation platform, wherein a cable of the annular inspection mechanism is arranged along the annular groove and is connected with the cable telescopic device. The steel belt driving mechanism drives the annular steel belt to move in an annular mode and drives the annular inspection mechanism on the steel belt driving mechanism to perform annular inspection, and a cable on the annular inspection mechanism achieve synchronous take-up and pay-off under the action of the cable telescopic device. According to the invention, the cable telescopic device can follow the movement position of the annular inspection mechanism to release or withdraw the cable.

The invention discloses an assembling stress testing platform for a structural member of a heavy type machine tool. The testing platform is characterized by comprising a pedestal, horizontal guide rails, slide blocks, rear supports, horizontal hydraulic cylinders, columns, a balancing connection plate, vertical hydraulic cylinders and a movable crossbeam. The testing platform can test influence on assembling stress and precision when two drivers of the heavy type machine tool are asynchronous, influence of deadweight of the movable crossbeam of the heavy time machine tool on the assembling stress, and influence of parallelism and flatness errors of the guide rails on the assembling stress and precision; and testing results can provide bases for optimizing assembling of the guide rails, optimizing pretightening forces of the slide blocks and optimizing the parallelism of the guide rails of the heavy type machine tool.

The invention discloses a bearing testing machine with adjustable pre-tightening force. The bearing testing machine comprises a driving assembly, an axial force applying assembly, a radial force applying assembly, a pre-tightening force adjusting assembly, a data acquisition set and a main shaft. The driving assembly is used for providing driving force for the main shaft and is arranged on one end of the main shaft. A to-be-tested bearing is installed on the main shaft. The axial force applying assembly is used for simulating axial force of axial working conditions of the bearing and is arranged on the other end of the main shaft. The radial force applying assembly is used for simulating radial force of radial working conditions of the bearing, and is arranged on the upper part of the to-be-tested bearing. The pre-tightening force adjusting assembly is used for adjusting the pre-tightening force of the to-be-tested bearing and is installed on the main shaft and on one side of the to-be-tested bearing. The data acquisition assembly is connected with the to-be-tested bearing and used for testing and acquiring temperature and vibration change of the to-be-tested bearing. According to the invention, measurement of performance of temperature rise and vibration under different pre-tightening force can be achieved and the testing machine is advantaged by simple structure, convenient test and highly adaptability.

A motor includes a stator, a rotor and a motor base. The stator includes a stator core and a stator winding wound on the stator core. The rotor includes a magnet which is mounted on a motor shaft andcan rotate with the motor shaft. The stator is fixedly supported on the motor base, and the motor shaft is rotationally supported on the motor base through at least one bearing. The rotor is located near one end of the motor shaft, the at least one bearing is arranged near the other end of the motor shaft opposite to the rotor, and the rotor is in a cantilever structure. The motor has a simple andcompact structure, and is convenient to maintain. A gas turbine including the motor is further disclosed.

The invention provides a clamp type pressurizing device for formation and capacity grading of a square battery cell. The clamp type pressurizing device comprises a clamp type tray, a support frame, a pressurizing connecting mechanism and a plurality of trays, the plurality of trays are movably connected to the support frame, and the plurality of trays are connected together to realize linkage; the pressurizing connecting mechanism is connected to one of the trays; the pressurizing device comprises a driving device and a fixed seat; the driving device is fixedly connected to the fixed seat; the output end of the driving device is detachably connected to the pressurizing connecting mechanism; and the pressure detection device is used for detecting the pressure borne by the tray. The tray is pressurized through the pressurizing device, the pressure on the tray is detected through the pressure detection device, and the pressure applied by the pressurizing device can be adjusted in time, so that the applied pre-tightening force is more uniform, more stable and optimal.