154results about How to "Small preload" patented technology

The invention provides an aerial camera Cassegrain primary and secondary mirror supporting structure, belongs to the technical field of optical engineering, and aims at solving problems in the prior art that the supporting structure is complex, the processing and adjusting cycle is long and cost is high. A primary mirror base is fixedly connected with one end of a mirror cone. A primary mirror gasket is arranged between the primary mirror base and the mirror cone. A secondary mirror base is fixedly connected with a connecting frame. An axial gasket and an angular gasket are arranged between the secondary mirror base and the connecting frame. The connecting frame is fixedly connected with the other end of the mirror cone. A primary mirror and a secondary mirror are respectively fixed on the primary mirror base and the secondary mirror base. Flexible hinges are directly processed on the primary mirror base and flexible slots are processed on the secondary mirror base so that stress transmitted to the surface of a reflecting mirror in change of external environment temperature and the assembling process can be reduced and optical surface figure accuracy can be enhanced; and axial distance and relative angle of the primary mirror and the secondary mirror are adjustable so that the primary mirror and the secondary mirror are ensured to possess correct spatial position, and the assembling process is simple and short in the cycle.

The invention discloses a planetary speed reduction type eccentricity-adjustable helical hole-milling device. The planetary speed reduction type eccentricity-adjustable helical hole-milling device is characterized by comprising a rotation system, a revolution system, a radial eccentricity adjusting system, a clamping braking system assembly and an axial feeding system. The radial eccentricity adjusting system can achieve precise trace linear eccentricity adjustment with high transmission ratio, and required input power is small. Compared with sliding block adjusting structures disclosed by existing patents, the radial eccentricity adjusting system can perform adjustment conveniently with less labor, and compared with a dual eccentric sleeve structure and an offset sliding block structure, the ratio of the size of the adjusting structure to the size of a rotation power source is greatly decreased, the occupied space is reduced, and the dead weight is reduced relatively in case of the identical material. Compared with an electromagnetic brake, the clamping braking system assembly can perform braking easily and conveniently; compared with a radial screw holding structure, the required pretightening force is small, and clamping is reliable; and compared with a worm and gear structure, self-locking never fails, and the working stability is high.

The invention discloses an expressway guardrail cleaning device which comprises a connecting support, a reversing arm, a steering arm, a connecting bar component, a spring, a sweeper and a sweeper support assembly, a swing cylinder, a swing cylinder seat, a lifting cylinder, and a four bar mechanism formed by the connecting bar component, the steering arm and the sweeper support assembly. The middle of the swing cylinder seat is groove-shaped and provided with a connecting block inside. The connecting block is fixed with one end of a guide shaft. The other end of the guide shaft penetrates through a guide hole in the groove-shaped bottom of the swing cylinder seat. The other end of the guide shaft is provided with a limit adjusting nut. The spring, a compression spring, is arranged on the guide shaft and arranged between the connecting block and the groove-shaped bottom of the swing cylinder seat. The swing cylinder seat is arranged on the reversing arm. A piston of the swing cylinder is hinged with the reversing arm. The expressway guardrail cleaning device is convenient to operate and capable of adjusting vertical position of the sweeper and prolonging service life of the spring.

The invention provides a universal curved-surface clamp which comprises an upper clamping part and a lower clamping part, wherein a lifting part is arranged between the upper clamping part and the lower clamping part and is used for adjusting the distance between the upper clamping part and the lower clamping part, and a workpiece to be processed is arranged between the upper clamping part and thelower clamping part; a plurality of clamping bars are arranged on the upper clamping part and the lower clamping part, and the clamping bars of the upper clamping part correspond to the clamping barsof the lower clamping part; the clamping bars are correspondingly provided with elastic components; and a clamping curved surface corresponding to the workpiece to be processed is formed between theclamping bars of the upper clamping part and the lower clamping part, through the elastic components. The spring stiffness of the universal curved-surface clamp is moderate, the pretightening force issmall and does not damage the workpiece, and the flexible clamping is realized.

The invention discloses a multi-flexible beam vibration control device and method based on synchronous belt drive. The device comprises a flexible beam body, a detection part and a control part. The flexible beam body comprises three flexible beams of the same size. The detection part comprises a piezoelectric sensor and an acceleration sensor, wherein the piezoelectric sensor and the acceleration sensor are respectively arranged on the flexible beams. The control part comprises a synchronous belt drive control system and a piezoelectric drive control system. The vibration signal of the flexible beam structure is detected by the piezoelectric sensor and the acceleration sensor. A synchronous belt driven by a servo motor and a piezoelectric drive are used as an actuator for suppressing vibration. The device can be used to study the influence and vibration control of gravity, synchronous belt gap characteristics, synchronous belt elasticity and other factors on the vibration of the flexible beam structure.

The invention relates to a hydraulic steering gear, belonging to the technical field of hydraulic transmission and control. One end of the valve body of the steering gear is fixedly connected with a stator with a cycloidal pin wheel rotor. A spool which stretches out of a front shaft and a valve pocket which can form a runner switching valve together with the spool are arranged in the valve body. A linkage shaft penetrates through the inner hole of the spool. One end of the linkage shaft is provided with outer teeth which are engaged with a spline in the rotor, and the other end of the linkage shaft is connected with the spool through a radial shifting pin. An annular sealing groove is arranged on the surface of the inner hole of the valve body which is matched with the front shaft. An annular sealing skeleton made of a lubricating wear-resistant material is installed in the sealing groove. One surface of the sealing skeleton is in fit with one sealing surface, and the other surface of the sealing skeleton is provided with a groove which can hold a sealing ring. An elastic sealing ring which is in fit with the other sealing surface is arranged in the groove. On the premise that a good sealing effect is guaranteed, the input torque for power steering is effectively reduced.

The present invention discloses a macro-algae breeding floating frame for adsorbing arsenic in seawater, which comprises a floating frame, a floating ball connected with the floating frame, a connecting standpipe with two closed ends, a piston rod, and a floating airbag. A buoyancy adjusting cavity is arranged in the floating frame. A unidirectional drain pipe is arranged on the bottom surface ofthe floating frame. The connecting standpipe passes through the floating frame, and both ends of the connecting standpipe protrude out of the floating frame. Water inlet holes are formed in the outerside wall of the connecting standpipe, below the floating frame; air inlet holes are formed in the outer side wall of the connecting standpipe, inside the floating frame; a high pressure gas pipe is connected with the outer side wall of the connecting standpipe, above the floating frame; the top end of the connecting standpipe is provided with an air outlet check valve. A first piston is arrangedin the connecting standpipe. One end of a piston rod is fixedly connected with the first piston, and the other end of the piston rod is fixedly connected with the floating airbag. The piston rod is sleeved with a first spring, between the first piston and the upper wall of the connecting standpipe. The macro-algae breeding floating frame for adsorbing arsenic in seawater has ingenious structure, can adjust ups and downs, has strong anti-wind-wave ability and great practical value, and is conducive to the stable growth and reproduction of macro-algae.

The present invention provides a tension control device capable of ensuring that the tensile force is nearby constant value. Said tension control device includes the following several portions: machine frame and warp beam flange, vibrating roller, fixed roller, brake wheel, brake-and-clutch lining, spring, two swinging arms and rotary arm which are placed on the machine frame and tension regulation device. Besides, said invention also provides the working principle of said tension control device and its concrete operation method.

The invention provides an axial positioning device of a crushing roller, which relates to a crushing machine and solves the problems that in the prior art, the installation and the maintenance of the crushing roller are difficult, and the equipment operation reliability is poor. The axial positioning device comprises high-strength locking screw nuts, a plurality of high-strength round head propping and pushing screws and two high-strength propping and pushing gaskets, wherein the circumferential rings of the two end surfaces of the high-strength locking screw nuts are provided with a plurality of threaded holes, the two locking screw nuts are respectively matched and connected with external screw threads of the fixing end and the floating end of a roller shaft, one propping and pushing gasket is arranged between the locking screw nuts and a bearing arranged at the floating end, the other propping and pushing gasket is arranged between the locking screw nuts and a No. IV isolation ring, and the round head propping and pushing screws are connected with the threaded holes arranged on the end surfaces of the locking screw nuts. The axial positioning device is used for the axial positioning of the crushing roller of a double-tooth roller crushing machine, the service life of parts can be prolonged, in addition, the installation and the maintenance can be conveniently and fast carried out, and the production efficiency of equipment is greatly improved.

The invention provides a cooling device of a plastic thin film processing device and belongs to the technical field of machinery. The cooling device solves the problem of complex operation of a cooling roller in a thin film processing line. The cooling device includes two pedestals and a roller arranged therebetween. One end of the roller is sealed while the other one end is opened. A rotational portion is arranged on the sealed end and is axially fixed to the corresponding pedestal. A liquid inlet pipe is installed in the opened end and comprises a liquid inlet portion, which is axially arranged along the roller, and a liquid outlet portion, which is arranged in the radial direction of the roller. The outer end of the liquid inlet portion is stretched out from the opened end and is fixed to the corresponding pedestal. A ring-shaped connection portion is arranged on the edge of the inner end of the liquid inlet portion. A sealing ring is arranged between the connection portion and the roller. A refrigerating chamber is formed between the connection portion and the inner wall of the roller. The liquid inlet portion is communicated with a refrigerating system. The refrigerating system works so that a refrigerant cyclically flows in the refrigerating chamber. The cooling device is convenient to operate.

The invention relates to a shield tunnel line segment lining structural stiffness gear-drive reinforcing device, comprising a fixed end (1), a loading end (4), a reinforcing tie rod (3) and a releasable loading lever (2), wherein the fixed end (1) and the loading end (4) are fixedly connected to adjacent pipe rings respectively; the fixed end (1) is connected with the loading end (4) through the reinforcing tie rod (3). The reinforcing tie rod (3) comprises a fixed end reinforcing tie rod (31), a loading end reinforcing tie rod (33) and a release sleeve (32), and two threads matching respectively with external threads of the fixed end reinforcing tie rod (31) and loading end reinforcing tie rod (33) are arranged in the release sleeve (32); one end of the loading end reinforcing tie rod (33) is provided with an external thread matching with an internal thread of the release sleeve (32), and the other end of the loading end reinforcing tie rod (33) is a loading rack and barbed racks on its two sides.

To provide a bearing device for a wheel installed on a light-weight light alloy knuckle and capable of preventing preload reduction and bearing creep from occurring due to temperature rise. This bearing device for the wheel comprises a hub wheel (1) integrally having a wheel mounting flange (4) at one end and having a small diameter step part (5) axially extending from the wheel mounting flange (4) formed therein, a wheel bearing (3) formed of a double row bearing disposed in the small diameter step part (5), and the knuckle (2) forming a suspension device and formed of a light alloy. The wheel bearing (3) is press-fitted into the knuckle (2) at a specified interference, and the hub wheel (1) is rotatably pivoted on the knuckle (2). A pair of annular grooves (18) are formed in a loading area on the outer periphery of the outer ring (12) of the wheel bearing (3), and resin bands (19) formed of a heat resistant polyamide synthetic resin and having a coefficient of linear expansion of 8 to 16 x 10<-5>/ DEG C are filled in the annular grooves (18) by injection molding.

The invention discloses a pit foundation supporting structure for mining. The pit foundation supporting structure comprises a bolt, an adjusting module and a through hole; the adjusting module is arranged at one end of the upper portion of a base plate, and a supporting plate is arranged at the other end of the upper portion of the base plate; a spring cavity is formed in one end of the interior of the adjusting module, and a lead screw is arranged at the other end of the interior of the adjusting module; a spring clamping plate is arranged at the end, close to the lead screw, of the interiorof the spring cavity; and a spring is arranged on one side of the spring clamping plate, and a torsion head is arranged at the end, away from the spring cavity, of the lead screw. The pit foundation supporting structure has the beneficial effects that the pretightening force of the spring can be determined according to the geological softness degree of a foundation pit, the torsion head is operated to rotate clockwise to pressurize the spring, the pretightening force of the spring is increased, otherwise, the pretightening force of the spring is decreased, the extruding force resulting in deformation of the supporting structure through the foundation pit wall is adjusted, the deformation space is reserved for the supporting structure, the supporting structure is protected, and the situation that the supporting structure is damaged due to the geological reason and excessively-large extruding force to the following supporting plate by the foundation pit wall is avoided.

The invention belongs to the field of motor rotor manufacturing, and particularly relates to a high-speed permanent magnet synchronous motor composite rotor spiral winding preparation method which comprises the following steps: preparing a composite magnetic material; adhering the inner surface of the permanent magnet to the surface of the motor spindle; connecting and mounting circular truncatedcone metal supporting pieces at two ends of the permanent magnet; continuously and spirally winding multiple layers of prepared composite magnetic materials on the outer surface of the carbon fiber ofthe permanent magnet in the circumferential direction, and applying a pre-tightening force in the winding process; and after winding of the composite magnetic material is completed, continuously performing winding at the surface of the composite magnetic material to form a carbon fiber protective sleeve, then performing curing, cleaning, circular truncated cone metal supporting piece dismountingand turning treatment sequentially, and preparing the composite rotor. In the spiral winding process, it can be guaranteed that each layer of magnetic powder adhesive film is evenly distributed, particularly, the problem of interlayer continuous winding can be solved, and the problem that due to continuous winding, the end of the rotating shaft is wrinkled in a winding mode or time is wasted in the cutting and re-winding process is fundamentally solved.

The invention discloses a low-temperature spherical valve which comprises a main valve body, a side valve body, a sphere, a valve cover assembly and a valve rod, wherein the main valve is provided with an outlet channel and a sphere mounting chamber; the side valve body is provided with an inlet channel; the sphere is mounted in the sphere mounting chamber; the side valve body is fixed on the main valve body and covers the sphere; the side valve body is provided with a plurality of spring mounting holes extending in the direction that a medium flows, and a circular caulking groove; the spring mounting holes are communicated with the caulking groove; a compensation spring and a gasket are mounted in each spring mounting hole; a sphere gasket is mounted in the caulking groove and is in extrusion seal fit with the sphere; the sphere and the sphere mounting cavity are sealed through the sphere gasket; the valve cover assembly is fixed on the main valve body; the valve rod penetrates through the valve cover assembly and is fixedly connected with the sphere. The low-temperature spherical valve increases the balancing force to the sphere gasket, still has favorable sealing performance when the sphere gasket is subjected to low-temperature shrinkage distortion, and thus is suitable for being used in pipelines of low-temperature media.

The invention discloses an overflow valve comprising a valve body, a main valve seat, a main valve core, a pilot valve seat, a pilot valve core, a main valve spring, a pilot valve spring, a pilot valve seat installation hole and a pilot valve seat limit part, wherein the main valve seat is fixedly sleeved in the valve body, and the pilot valve seat is movably sleeved in the pilot valve seat installation hole and is provided with a pilot valve oil inlet; and the pilot valve seat limit part is used for limiting the motion range of the pilot valve seat, so that the motion stroke of the pilot valve seat is shorter than that of the pilot valve core. Compared with the prior art, with the adoption of the overflow valve, abrasion of the pilot valve core and the pilot valve seat is small, and the pre-pressure of the pilot valve spring is small, so that the using reliability of the overflow valve can be greatly improved, and the service life of the overflow valve can be greatly prolonged.

The invention relates to a pneumatic flexible wrist with an elastic hemispherical braking device, belongs to a robot-driven executing device, is applied to a robot wrist component and an executing mechanism, and aims to solve the problems of large size, insufficient flexibility, difficulty in realizing posture keeping and the like in existing motor-driven, hydraulic and pneumatic flexible joints.The pneumatic flexible wrist is structurally characterized in that an inner elastic hemisphere, a ball seat, a flexible axial driver and artificial muscles are arranged between upper and lower flangesof a wrist; wrist braking force is determined by assembly pre-tightening force between the inner elastic hemisphere and the ball seat; the flexible wrist is in a braking state when not working, so that the posture of a robot can be kept well under different loads; after pressure gas is introduced into the flexible axial driver, the wrist can release the braking state or adjust the braking force as required; the flexible wrist has two degrees of freedom, namely, pitching and swinging in a working state; and the pneumatic flexible wrist has flexibility and an overload protection function.