100results about How to "Adjustable preload" patented technology

The invention relates to a device for automatically eliminating clearances of a screw drive pair, which comprises a leading screw, a main nut, a bolt, a machine tool sliding plate, an adjusting bolt, a spring, a guide post, a nut with an inclined plane, a bolt, a locking nut, a wedge block and a ball. The device is characterized in that the main nut and the nut with the inclined plane are connected with the leading screw respectively, the main nut is connected with the machine tool sliding plate through the bolt, and the flange of the nut with the inclined plane is provided with a through hole so that the nut with the inclined plane can move axially along the guide post. The wedge block with a self-locking function is supported between the main nut and the nut with the inclined plane; andone end of the spring is pressed on the wedge block with the self-locking function, while the other end is tightly pressed by the adjusting bolt. The incline plane of the nut with the inclined plane is provided with a guide groove. The device automatically eliminates axial clearances, has no reverse idle stroke, has adjustable pretightening force, good axial rigidity, smooth transmission, low cost, compact structure and high space utilization rate, is applied to feed drive systems of a metal cutting machine tool and a numerical control machine tool, and can greatly improve the processing accuracy.

A fixed torque preload piece is positioned between two nuts of a ball screw, the preload piece is formed with through hole located in an axial direction of the two nuts for receiving at least two steel balls. Two terminal openings of each of the through holes are defined in the surfaces of the preload piece facing the two opposite nuts. Three radial threaded holes are formed in the outer periphery of the preload piece, and the threaded holes are vertical to and in communication with the through holes. An adjusting member, an elastic member and an adjusting screw are received sequentially in the respective threaded holes. The steel balls in the through holes are pushed against the two nuts by the arc-shaped abutting surface of the adjusting member, the pushing of the steel balls can produce an adjustable preload, and can absorb the sudden increase of the pressure effectively, thus obtaining the objective of the present invention of outputting torque stably.

The invention discloses a prestretching mounting structure for a screw rod. One end of the screw rod is fixed, and the other end of the screw rod is free; bearings are separately arranged at the fixed end and the free end; the bearing at the fixed end is arranged in a bearing block fixed with a machine tool main body structure; a bearing bush is arranged outside the bearing at the free end of the screw rod; a motor base connecting flange is arranged outside the bearing bush and is fixedly connected with a motor base; a through hole is formed in the motor base connecting flange; a longitudinal sliding chute is formed in a position, corresponding to the through hole, of the bearing bush; a thread section is arranged at the outer side of the bearing bush; a thread section part is located at the lower side of the motor base connecting flange; part of the thread section part extends from the outer side of the motor base connecting flange; and a bearing bush adjusting nut is screwed in the thread section. The bearing bush adjusting nut can screw in the thread section of the bearing bush by a certain distance, so that the prestretching amount of the screw rod can be controlled, further the control over the prestretching amount of the screw rod is conveniently realized, and the simplicity in operation is realized.

The invention relates to the field of underground engineering surrounding rock support and in particular relates to an underground engineering roadway yielding support system. The system comprises a yielding hydraulic prop, a yielding anchor rod, a mesh, a steel beam, a pressure sensor and a controller, wherein the mesh is spread on roadway surrounding rock, and the roadway surrounding rock is supported by using the yielding anchor rod; the steel beam is erected, and top plate support is performed through the yielding hydraulic prop; the yielding anchor rod comprises an anchoring head, one or more yielding connectors, an elastic cushion block, a W-shaped steel strip, a base plate, a yielding device and a handle nut; each yielding connector is used for connecting two left and right sections of anchor rod bodies and is a cavity; the connected two sections of anchor rod bodies are positioned at the end of the cavity, and a piston stopper is arranged at the end; a spring is arranged between the piston stopper and the end of the cavity of each connector. The constant yielding support can be realized according to actual geological surrounding rock stress conditions, the conditions of the support system are regulated, a good yielding-supporting support system is formed, and the optimized constant yielding support is achieved.

An adjustable buffer optionally including at least some of a buffer element having an elongate buffer element body portion, wherein the buffer element body portion includes an externally threaded portion; a collar nut having a collar nut aperture formed therethrough, wherein at least a portion of the collar nut aperture is internally threaded so as to interact with the externally threaded portion of the buffer element body portion, and wherein one or more collar nut recesses are formed in the collar nut; and a locking collar having a locking collar aperture formed therethrough, wherein the locking collar aperture is formed so as to accept at least a portion of the buffer element body portion therethrough, wherein the locking collar includes one or more locking collar protrusions, and wherein the one or more locking collar protrusions are mateable with the one or more collar nut recesses.

A novel cable rope climbing device comprises a rack (1) and a climbing unit (K) composed of an upper idler wheel (2), an upper hinge I (3), an upper connecting rod I (4), a brake (5), an upper hinge II (6), an upper supporting seat (7), an upper hinge III (8), an upper connecting rod II (9), an upper hinge IV (10), a pre-tightening piece (11), a lead screw (12), a pre-tightening motor (13), a lower hinge I (14), a lower connecting rod I (15), a drive motor (16), a synchronous pulley I (17), a lower supporting seat (18), a lower hinge II (19), a synchronous belt (20), a lower hinge III (21), a lower connecting rod II (22), a synchronous pulley II (23), a lower hinge IV (24) and a lower idler wheel (25). The novel cable rope climbing device can serve as a movement carrier for equipment for cable rope detection, maintenance and the like, and the problems that manual operation is high in labor intensity and low in safety, and an existing cable rope climbing device is poor in adaptability are solved.

The invention relates to the field of underground construction surrounding rock support and particularly to a supporting pressure adjustment roadway surrounding rock support method. The supporting pressure adjustment roadway surrounding rock support method utilizes an underground construction roadway yield support system. The underground construction roadway yield support system comprises yield hydraulic pillars, yield anchor bolts, meshes, a steel beam, a pressure sensor and a controller. The meshes are laid on roadway surrounding rock, and the roadway surrounding rock is supported through the yield bolts; the steel beam is erected and performs roof support through the yield hydraulic pillars; every yield anchor bolt comprises an anchoring head, one or more yield connectors, an elastic cushion block, a W-shaped steel strip, a base plate, a yield device and a handle nut, wherein the yield connector is used for connecting a left anchor bolt body and a right anchor bolt body and is a cavity, the two anchor bolt bodies are arranged inside the end portions of the cavity and provided with piston stoppers, and springs are arranged between the piston stoppers and the end portions of the connector cavity. Therefore, the supporting pressure adjustment roadway surrounding rock support method can achieve constant yield support according to actual geological surrounding rock stress situations, adjust the status of a support system to form a good yield-support support system and accordingly obtain optimized constant yield support.

The invention discloses a horizontal CNC gear hobbing machine which comprises a lathe bed, a spindle box, a workpiece holder, a tailstock, a hob rest, a hob, a workbench, a cross beam and an oblique support. The spindle box is mounted on the lathe bed, the spindle box comprises a workpiece spindle, and the workpiece holder is mounted on the workpiece spindle. The hob rest is mounted on the workbench, the workbench is mounted on the lathe bed, and the hob is mounted on the hob rest. One end of the cross beam is mounted on the top of the spindle box, the other end of the cross beam is mounted on the oblique support, and the oblique support is mounted on the lathe bed. The tailstock is inversely hung on a trapezoidal guide rail of the cross beam. According to the technical scheme, the tailstock breaks the routine to be mounted on the cross beam and is in a suspension mode, the tailstock and the hob rest are arranged up and down, and a condition is created for guaranteeing wide-range adjustment of the hob rest which is horizontally arranged below; besides, the horizontal mode of a main machine body of the gear hobbing machine is arrayed into a gantry mode, due to the up-down arrangement of the hob rest and the tailstock, the occupied space of a machine tool is saved, and thus the machine tool structure can be simplified easily.

A bearing preload adjuster for a bicycle crank set and bottom bracket comprises an adjustment ring for coupling with a bicycle crank arm, a movable plunger comprising an external thread for rotatably coupling with the adjustment ring. The adjustment ring is rotated in order to cause the plunger to extend along an axis of the bottom bracket and apply pressure to a bottom bracket bearing inner race. The adjustment ring is rotated until the clearance in the bearing assemblies and the play in the bottom bracket assembly has been eliminated. This allows the crank assembly to rotate freely, while preventing the crank assembly from sliding side to side inside the bearing bores and along the axis of the crank spindle.

The invention discloses a self-induced vibration device for a small subsoiler, and belongs to the field of agricultural machinery. The device is mainly characterized by being composed of a lever, a pivot pin, a lead screw, a horizontal spring, a sliding block, a pre-tightening bolt, a top block, a vertical spring, a locking nut, a limiting bolt and the like. The self-induced vibration device in the horizontal direction and the vertical direction generates vibration due to the fact that resistance generated in the working process of a sub-soiling shovel changes constantly, the sub-soiling shovel is driven to vibrate. The penetrating angle of the sub-soiling shovel and the pretightening force of the vertical spring and the horizontal spring are adjustable. A sliding groove formed in the leftside of the lever can discharge sundries in time. When a locating pin is in an insertion state, the self-induced vibration device is in a non-vibrating working mode; when the locating pin is in a pulling-out state, the self-induced vibration device is in a vibrating working mode. According to the self-induced vibration device, the sub-soiling operation power consumption can be lowered to the maximum extent, the device has the advantages of being flexible in mechanism motion, simple in structure and convenient to install, and sub-soiling operation of the small subsoiler can be better adapted.

The invention discloses a mechanical device for automatically replacing an automobile tire and a control method. The mechanical device comprises a case, a mechanical arm, a high-pressure gas generating device, a screw jack, an automatic locating nut assembling and disassembling mechanism and a reversing device. Automatic tire replacement operation is achieved, a plurality of nuts are assembled and disassembled at the same time, the pre-tightening force is synchronously adjustable, a hub can be automatically located, the tire replacement efficiency and safety are improved, and the service life of an automobile is prolonged.

The invention discloses a steel wire rope pre-tightening device for flexible attachment of a tower crane. The steel wire rope pre-tightening device comprises a first connecting plate, a second connecting plate, screws, a connector and a plurality of pulleys. The first connecting plate is in threaded connection to one end of each screw. The second connecting plate is in threaded connection to the other end of each screw. The positions, on the outer side of the first connecting plate and the outer side of the second connecting plate, of each screw are each provided with a nut. The connector comprises an upper connecting plate, a lower connecting plate and two rib plates, wherein the upper connecting plate and the lower connecting plate are parallel, and the two rib plates are fixed between the upper connecting plate and the lower connecting plate. The two rib plates are rotationally connected to the outer side of the first connecting plate. Second mounting plates perpendicular to the second connecting plate are fixed to the outer side wall of the second connecting plate. The pulleys are arranged on the second mounting plates. According to the steel wire rope pre-tightening device for flexible attachment of the tower crane, flexible attachment of the tower crane can be achieved, and for buildings and variable-section buildings with attachment points far away from a tower body, the field construction requirement is met, and safety operation, smooth mounting and smooth demounting of the tower crane are achieved.

The invention discloses an improved hydraulic motor, a front end tapered roller bearing, a rear end tapered roller bearing and a driving shaft are installed by interference fit, an intermediate pressure ring is installed on the front end tapered roller bearing by interference fit, an oil groove radial channel arranged on the driving shaft is extended to the driving shaft front end to prompt the driving shaft to generate centrifugal force to improve the hydraulic energy to transform into mechanical energy efficiency; the intermediate pressure ring and an outer ring of the rear end tapered roller bearing are in interference fit with an inner hole of a motor casing; a bearing pressure cover is mounted in the motor casing, a plunger ring shrinks and sheathes a plunger, the plunger and a ball head end of a center connecting rod are respectively installed in the driving shaft, a cylindrical spring is installed in the center connecting rod for prevention of locking of the center connecting rod, the cylindrical spring and the axially uniformly distributed plunger are filled into a cylinder body, an oil distributing plate and the cylinder body spherical surface are fit, a spring seat is arranged in the end part of the center connecting rod; a rear end cover is installed in the motor casing end part, a positioning pin is inserted into the oil distributing plate, and a flush valve is tightly installed on the rear end cover end part in order to realize the automatic control of cooling.