33 results about "Tangential contact" patented technology

A handheld, portable ladder anchoring system designed for pitched roofs or other pitched constructs, that secures ladder placement in all directions via a 360-degree ladder stop. Platform configuration embodies a tripodal, load bearing design of tangential contact points of ladder feet abutting the inner rim of the ladder stop with a third leg of tripodal force-distribution being a tie-down strap.

The present invention discloses a piezoelectric driver based on the epicycloid induction principle and a control method thereof, wherein the piezoelectric driver comprises a base, an initial gap adjustment unit, a stator unit and a mover unit; the base, the initial gap adjustment unit and the stator unit are fixedly connected in sequence from bottom to top, and the position of the stator unit along the X-axis direction and the Y-axis direction is adjusted by the initial gap adjustment unit; the stator unit is fixed on the base and the stator unit and the mover unit are located in the same horizontal plane; the mover unit comprises a bearing, a guide rail and a slider, the guide rail is fixed on the base, the slider is slidably connected to the guide rail, and the bearing is fixed on the base; the bearing is in close tangential contact with the slider along the Y-axis direction, and the outer ring of the bearing generates an epicycloid motion under the drive of the stator unit, thereby driving the slider to generate a corresponding burst motion. The present invention provides a solution for studying the elimination of the retraction motion of the stick-slip piezoelectric driver.

The invention relates to a device for assisting in the handling and implantation of at least one electrode support(s) for a cardiac device, in particular a cardiac pacing device, said at least one electrode support(s) comprising a distal end and a proximal end, the proximal end comprising at least one connector configured to be in electrical connection with at least one portion of the distal end, characterized in that said device comprises: - a body, preferably one-piece, configured to cover at least one portion of said at least one connector, - at least one receiving portion for a means of temporary electrical connection, such as a crocodile clip, said at least one receiving portion being electrically conductive, - at least one connection element in electrical connection with said at least one receiving portion, said at least one connection element being in controlled tangential contact with said at least one connector.The invention also relates to the use of this device for the transfer of electrical signals into or from a cardiac stimulation device electrode, as well as a method for assembling this device.

The invention relates to a multi-channel rotary joint with a balanced mechanical sealing structure, which is applied to the technical field of rotary joints and comprises a rotary shaft, a shell, an annular groove, a sealing ring, a channel outlet, an assembling end, a telescopic cylinder, an introduction sheet and a pressure monitoring module. Through the arrangement of the annular groove, a circulating medium can do circular motion in the annular groove, the purpose that the rushing-out pressure of the circulating medium is converted into rotating kinetic energy is achieved, and therefore the sealing pressure of the sealing ring is reduced, the leading-in piece stretches into the annular groove, and the circulating medium rapidly enters the assembling and connecting end by utilizing the leading-in piece to face the circulating medium discharged out of the channel outlet. Therefore, the staying time of a circulating medium in the annular groove is effectively shortened, the leakage risk of the rotary joint is reduced, the stress condition of the leading-in piece is monitored through the pressure monitoring module, and the condition that the circulating medium enters the assembling end is reflected through the change of pressure data.

The present application discloses a method, device and equipment for determining the tangential contact stiffness of a bolted joint surface. The method includes: constructing a preload relaxation model that characterizes the relationship between the preload of the bolted structure and time; respectively constructing a fractal dimension model and a surface roughness model that characterize the relationship between the fractal dimension and surface roughness of the bolted joint surface and time based on the preload relaxation model; constructing a tangential contact stiffness model that characterizes the change of the tangential contact stiffness of the bolted joint surface with time based on the preload relaxation model, the fractal dimension model and the surface roughness model; inputting the assembly time of the target bolted structure to be evaluated into the tangential contact stiffness model, and calculating the tangential contact stiffness of the target bolted structure, so as to evaluate the target bolted structure based on the determined tangential contact stiffness. Through the above method, the tangential contact stiffness of the bolted joint surface can be calculated more accurately and reliably, providing a basis for the accurate prediction of the time-varying characteristics of the dynamic performance of the whole machine.

The invention relates to the technical field of bridge detection, in particular to a bridge crack wall-climbing type detection device and detection method.The bridge crack wall-climbing type detection device comprises a frame, the frame is quadrilateral and composed of four panels, and connecting discs are arranged on the panels; a detection piece is arranged on the connecting disc; the detection piece comprises a mounting groove formed in the connecting disc, guide rods which are symmetrically distributed are arranged at the two ends of the mounting groove in a sliding mode, a rolling wheel is rotationally arranged at one end of each guide rod, and abutting springs located between the cross beam and the guide rods are arranged in the sliding holes; through a gear-arc rack meshing structure of the adjusting piece, the connecting disc can accurately rotate by 45 degrees, so that the roller and the circular bridge column form tangential contact, and full-circumference detection of the circular bridge column is realized by matching with a spiral rising track of the frame; angle adjustment is not needed for the square bridge column, detection can be achieved by directly sleeving and locking the frame, special equipment does not need to be replaced, and the application range of the device is greatly widened.

The embodiment of the invention relates to the technical field of combined structure dynamic analysis, in particular to a method suitable for determining the vibration response of a bolt connection combined structure, and the method comprises the steps: S10, determining the stress distribution of the combination of each bolt and nut; s20, determining the contact load, the normal contact stiffness and the tangential contact stiffness of a connection interface according to the stress distribution of the combination of each bolt and nut determined in the step S10 and the applied external load; s30, determining the strain energy of the connection interface according to the contact load, the normal contact stiffness and the tangential contact stiffness of the connection interface determined in the step S20; s40, according to the strain energy, determined in the step S30, of the connection interface, the first structure and the second structure are combined, the overall strain energy, kinetic energy and external force work of the bolt connection combined structure are established, a system motion equation is established and solved, and the vibration response of the bolt connection combined structure is determined. According to the determination method, the prediction precision and efficiency of the vibration response of the bolted connection combined structure can be improved.

A mixing and extrusion machine (10) for the manufacture of rubber mixtures has a mixer with a converging conical twin screw (12) with a fixed frame (14) that supports sleeves (16). Two screws (18), being mounted at an angle, are mounted in the mixer (12) so as to move in translational movement between an opening (22) arranged upstream and an outlet (25) arranged downstream of the sleeves, so that the thread tips of each screw contact tangentially the surfaces of the opposite screw so that the screws remain substantially in contact with each other when the screws rotate at an angle and at a center distance that facilitates self-cleaning. The screw threads maintain tangential contact with the inner surfaces of the sleeves, thus preventing the retention of mixing material on these surfaces.

The utility model belongs to the technical field of office furniture, and particularly relates to a telescopic rod sliding mechanism and a chair seat with a footrest, the telescopic rod sliding mechanism comprises an elliptical telescopic rod, and the telescopic rod sliding mechanism also comprises an elliptical auxiliary sleeve provided with a plurality of arc-shaped propping plates which protrude inwards; at least part of the oval telescopic rod is inserted into the oval auxiliary sleeve and can move relative to the oval auxiliary sleeve under the action of external force, and the arc-shaped abutting plate makes tangent contact with the oval auxiliary sleeve. An oval auxiliary sleeve is arranged between a seat frame and an oval telescopic rod for separated connection, the oval auxiliary sleeve is detachably installed in a sleeve fixing base at the bottom of the seat frame, and the oval telescopic rod is only in contact with an arc-shaped abutting plate, protruding inwards, of the oval auxiliary sleeve. And the plurality of arc-shaped propping plates are arranged in a certain manner to jack up the elliptical telescopic rod in a suspended manner, so that the elliptical telescopic rod can smoothly move in a track with very small friction force, and the stability of the footrest device is kept.

The utility model provides a motor fixing and supporting device, which relates to the technical field of motor mounting structures, and is characterized in that a pushing frame is slidably mounted in the middle of a top plate of a mounting base in a penetrating manner, and the whole pushing frame is jointly composed of a bottom stress frame shaped like a Chinese character'ri 'and two transverse top shafts symmetrically welded to the top end of the stress frame shaped like the Chinese character'ri' in a front-back manner; two non-through transverse placing grooves are symmetrically formed in a top plate of the mounting base, and in a normal state, two transverse top shafts are inserted and hidden in the two transverse placing grooves; and a driving shaft is rotatably mounted in the middle of the interior of the mounting base, two ejector rods are welded to the driving shaft in a bilateral symmetry mode, the two ejector rods are turned upwards to abut against and make contact with the stress frame shaped like the Chinese character'ri ', and the left end of the driving shaft is partially sleeved with a driven gear. And the cross sections of the two transverse jacking shafts are circular structures and are in tangent contact with the fixed bottom plate of the motor, so that the frictional resistance between the motor and the pushing frame can be further reduced, and the calibration and alignment operation is more convenient and labor-saving.

The invention relates to the technical field of wedge mechanisms, and discloses a rack type upturning wedge mechanism which comprises a wedge base, a linkage axial part is arranged on the wedge base, power execution parts are correspondingly arranged on the two sides of the linkage axial part in a matched mode, and the power execution parts on the two sides are in running fit with the linkage axial part. Power is transmitted in a tooth surface meshing mode, the contact point of the rack and the gear is located on the circumferential face of the outermost side of the gear all the time, pure tangential acting force is formed, no torsion is generated, the acting force direction is completely consistent with the transmission direction, force loss component force does not exist, and due to the outermost side tangential contact design, the transmission efficiency is greatly improved. Driving resistance is greatly reduced based on the principle of arm of force maximization, namely the closer to the outer side of the gear, the longer the arm of force is, the smaller the needed driving acting force is, efficient and labor-saving driving is achieved, meanwhile, the tangential force characteristic thoroughly avoids vertical friction component force of a traditional structure, and meshing friction resistance is further reduced to the minimum.

This invention discloses a high-rigidity double-row cylindrical roller backing bearing for multi-roll mills. It relates to a bearing field belonging to the technical field of green manufacturing and precision rolling equipment, and includes a thick-walled outer ring, an inner ring, double-row cylindrical rollers, and a center flange. The outer raceway of the thick-walled outer ring has an asymmetric unloading micro-zone along its axial direction away from the center flange. The center flange has inwardly recessed chamfered pressure-relieving grooves at the junction of its two guide surfaces and the bottom surface of the inner ring, creating an axially elastic suspended structure for the center flange. The inner end face of the cylindrical rollers near the center flange is a slightly convex spherical surface, and the two guide surfaces of the center flange are inclined conical surfaces radiating outwards, with tangential contact between them. This invention compensates for the bending of the outer ring under load through the asymmetric unloading micro-zone, eliminating edge stress concentration; and absorbs axial compressive force through the suspended center flange and the combination of spherical and conical surfaces, achieving adaptive load distribution and flexible pressure relief, significantly improving the bearing's service life under extreme off-center load conditions.

The invention relates to a grinding technology, in particular to automatic steel pipe groove grinding equipment and method based on automatic centering, a grinding structure comprises a bayonet socket connected with a clamping unit and a sliding rod in sliding connection with the bayonet socket, one end of the sliding rod is rotationally provided with an elastic supporting frame, and the other end of the sliding rod is provided with a clamping unit. The elastic supporting frame is provided with a polishing unit capable of being synchronously adjusted along with the elastic supporting frame. The design of the elastic supporting frame endows the polishing unit with the flexible adjusting capacity, the polishing unit can automatically adapt to angle changes when making contact with a groove, the self-adaption function is further enhanced through the telescopic driving part, it is ensured that the polishing unit can be adjusted in real time according to the actual angle of the groove by accurately controlling the position of the sliding rod, and the polishing efficiency is improved. By means of the automatic adjusting mechanism, the grinding piece can keep ideal tangent contact with the groove face no matter what angle deviation the grinding piece faces, and therefore the maximum grinding efficiency and the best grinding effect are achieved.

The invention discloses a method for evaluating the anti-sliding performance of a textured joint surface. The method comprises the following steps: 1) calculating the tangential contact stiffness of a rough contact surface part in the textured joint surface based on a statistical theory and a fractal theory; 2) calculating the tangential contact stiffness of the texture contact surface part in the textured junction surface according to the occlusion effect of the micro-convex body and the texture; 3) linearly superposing the tangential contact stiffness of the rough contact surface part and the tangential contact stiffness of the texture contact surface part to obtain the tangential contact stiffness of the textured joint surface; 4) obtaining the microscopic tangential displacement through the tangential contact stiffness of the textured joint surface; and 5) obtaining the anti-sliding capability of the textured joint surface according to the microscopic tangential displacement. According to the method, the anti-sliding performance of the textured joint surface is represented by adopting the tangential contact stiffness of the textured joint surface, and the anti-sliding performance of the textured joint surface can be accurately evaluated.

The invention belongs to the technical field of mechanical connection interface elastoplastic deformation analysis methods, and particularly relates to a connection interface contact and wear modeling method based on a rigid flat plate and a micro-convex body. According to the invention, modeling of contact and wear of the connection interface is realized based on the equivalent rigid flat plate and spherical micro-convex body theory; a semi-analytical model fusing multiple physical mechanisms is put forward, and the problem that a traditional model is insufficient in tangential wear description is solved by dividing the elastic stage, the elastic-plastic stage and the plastic deformation stage of a micro-convex body and combining the corrected'partial slippage-full slippage 'characteristic of tangential contact; friction dissipated energy (including normal load and tangential sliding work) is introduced to replace a traditional normal load driving hypothesis, association between microscopic energy accumulation and a macroscopic wear rate is established, a critical mechanism of sudden change of the wear rate is explained, and the curvature radius and the contact load of the micro-convex body after wear are corrected through dynamic feedback.

The invention is based on a rotor axle bearing device for a rotor axle of an electric motor, with a base body which has at least one axial opening for receiving the rotor axle with play, and with a play remover unit which is provided to remove a bearing play of the rotor axle mounted in the axial opening by an at least substantially play-free spring-elastic clamping of the rotor axle mounted in the axial opening at least between a first play remover element of the play remover unit and a second play remover element of the play remover unit, wherein the first play remover element is formed by a part of the base body.It is proposed that the second play-removing element is formed directly by a rotor axle shoe unit with a rotor axle shoe that tangentially contacts the rotor axis, has a rotor axle receptacle for at least partially encompassing the rotor axis, and is resiliently mounted by a spring-elastic element of the rotor axle shoe unit that is arranged without contact with the rotor axis but does not itself act in a spring-elastic manner, wherein the rotor axle shoe is designed as an element that is different from the spring-elastic element of the rotor axle shoe unit and is coupled to the spring-elastic element via a form-locking connection with mutually corresponding form-locking elements, wherein at least one of the form-locking elements is arranged centrally in the rotor axle shoe.

The invention discloses a method for analyzing the machining precision of a machine tool by bolt performance degradation in consideration of hole position errors, which considers the influence of manufacturing hole position errors on the rigidity of a bolted part for the first time. The method comprises the following steps: firstly, extracting normal and tangential contact rigidities of a joint surface under the conditions of different hole position errors, fractal parameters and pre-tightening forces by utilizing an abaqus finite element method to obtain a data set; and then, taking the hole position error, the fractal parameter and the pre-tightening force as input vectors, taking the joint surface rigidity as an output vector, and training data by utilizing a BP neural network to complete rigidity prediction. And finally, establishing a dynamic model of the gantry machine tool based on a multi-body system transfer matrix method so as to explore the influence of performance degradation of the bolts on the machining precision of the machine tool, and providing technical guidance for optimization of the bolt joint surfaces in engineering.

The invention relates to a device for assisting in the handling and implantation of at least one electrode support for a cardiac device, in particular a cardiac stimulation device, the at least one electrode support comprising a distal end and a proximal end, the proximal end comprising at least one connector configured to be electrically connected to at least one portion of the distal end, characterized in that the assistance device comprises: - a body, preferably a one-piece body, configured to cover at least a portion of the at least one connector, - at least one receiving portion for a temporary electrical connection means, such as a crocodile clip, the at least one receiving portion being electrically conductive, - at least one connection element connected electrically to the at least one receiving portion, the at least one connection element being in controlled tangential contact with the at least one connector. The invention also relates to the use of this assistance device for transferring electrical signals to or from a cardiac stimulation device electrode, and to a method for assembling this assistance device.

The application discloses a non-regular impact vibration test system of a light-weight two-wheeled frame, which comprises a bumping impact wheel, the bottom end of the rear wheel of the measured electric two-wheeled vehicle is in rolling tangential contact with the wheel surface of the upper end of the bumping impact wheel; the wheel surface of the bumping impact wheel is provided with a bumping tongue outlet extending in the radial direction, a bumping tongue extending in the radial direction of the rear wheel is movably arranged in the bumping tongue outlet, and the bumping tongue extends outwards from the bumping tongue outlet when the bumping tongue outlet faces upwards; in the final effect of the scheme, the rear wheel of the measured electric two-wheeled vehicle will be subjected to an impulse bumping impact of the bumping surface once, but the intensity of the impulse bumping impact is different each time, so that the purpose of non-regular vibration impact on the rear wheel is achieved.

A measuring fixture for the sealing surface of a wedge-type single-gate valve body, belonging to the field of valve processing technology, addresses the difficulty in measuring the distance between the sealing surfaces on both sides of a wedge-type single-gate valve. It includes a reference body and a main shaft. The reference body is connected to the valve body, with its inner bore axis directly above the reference body's axis. The main shaft is coaxial with the inner bore of the reference body and can move left and right. A measuring rod is locked to the main shaft. By measuring the tangential contact between the measuring rod and the two sealing surfaces, the horizontal distance between the center of the sealing surface and the axis of the measuring rod is calculated. Furthermore, by measuring the change in distance of the measuring rod when it is tangential to the two sealing surfaces, the center-to-center distance between the two sealing surfaces can be accurately obtained. This invention allows for efficient and accurate measurement of the distance between the sealing surfaces of a single-gate valve body.

This invention discloses a machining fixture and method for a ring-shaped thin-walled part at the head of a flame tube, belonging to the field of flame tube part machining technology. The invention sets a positioning unit and a pressing unit on the base. The pressing unit includes a support block, a top block, and a clamping component. The support block has an inclined mounting surface. Through the cooperation of the inclined mounting surface and the top block, the pressure applied by the clamping component to the top block towards the base is divided into radial and axial components. The point of application is located in the tangential contact area of ​​the outer circular surface, without directly pressing the end face of the part. Errors in the flatness of the end face only cause local suspension of the contact line, without introducing a forced correction bending load. This fundamentally cuts off the deformation transmission chain of "poor end face flatness - forced flattening - bending moment - machining rebound," avoiding axial warping and springback caused by end face clamping. After machining, the roundness, cylindricity, and end face runout accuracy of the part are significantly improved.

An endoscopic surgical instrument has a distal end configured to perform an action on tissue; a proximal end; a beam; a drive rod; and at least one rail supporting at least one bearing, the at least one bearing movable relative to the at least one rail. The distal end of the instrument is configured to receive at least a portion of the beam, the beam movable longitudinally in response to an action on the drive rod. The at least one rail is shaped and configured to contact the beam tangentially to prevent the beam from buckling as the beam is moved longitudinally.

Various embodiments of the present disclosure are directed to packing rings. In one example embodiment, a packaging ring is disclosed including a first axial ring end, a second axial ring end, at least three ring segments, a radial seal and at least one relief opening. Each of the at least three ring segments having a first segment end and a second segment end in a circumferential direction. A first segment end of one of the three ring segments including a first tangential contact surface and a first axial contact surface, the first axial contact surface facing towards the first axial ring end. A second segment end of another of the three ring segments including a second tangential contact surface and a second axial contact surface, the second axial contact surface facing towards the second axial ring end.

The utility model discloses a pipe cutter for metal chromatographic pipe, including base, cutting knife and bearing subassembly, the base is equipped with the groove cavity that runs through its opposite side surface, cutting knife is provided on the base and partially extends into the groove cavity, the bearing subassembly is provided on the base and can penetrate into the groove cavity in the mode of opposite to cutting knife, and the bearing subassembly is equipped with the groove cavity. Therefore, the bearing assembly and the cutting knife are in tangent abutting connection with a to-be-cut pipe inserted between the bearing assembly and the cutting knife. And at the time, the base or the to-be-cut pipe is rotated by applying external force, so that the to-be-cut pipe can be cut. The pipe cutter is simple in structure, small and exquisite in size, easy to control and carry, capable of effectively avoiding the phenomena of surface abrasion, pipe hole blockage and the like when the pipe is cut, capable of greatly improving the cutting quality of the pipe, and capable of being well applied to cutting operation of stainless steel chromatographic pipes and capillary pipes.

The invention discloses a non-involute variable-tooth-thickness gear machining method and device, equipment, a medium and a machine tool. The method comprises the steps that a non-involute variable-tooth-thickness gear tooth surface equation and a non-involute variable-tooth-thickness gear normal vector of a non-involute variable-tooth-thickness gear are constructed; a grinding wheel tooth surface equation and a grinding wheel normal vector of a grinding wheel are constructed, and the grinding wheel is used for grinding the non-involute variable-tooth-thickness gear; based on the geometric principle that the grinding wheel and the non-involute variable-tooth-thickness gear need to keep tangent contact in the machining process, the machining path of the grinding wheel is planned; and according to the grinding wheel tooth surface equation and the machining path, the non-involute variable-tooth-thickness gear is machined. The non-involute variable-tooth-thickness gear precise grinding device can achieve precise grinding of the non-involute variable-tooth-thickness

The present invention relates to a roll system of an integral multi-linear layout leveller, which includes an upper roll system and a lower roll system. The upper roll system includes upper working rolls and upper backup rolls, and the lower roll system includes lower backup rolls and lower working rolls. The diameters of the upper working rolls are equal, and the axial center heights of the first upper working roll from the inlet to the fourth upper working roll decrease in sequence, and the axial center heights of the fourth upper working roll to the last upper working roll at the outlet are equal. The diameters of the lower working rolls are the same and their axes are in the same plane. Each upper working roll is in tangential contact with two upper backup rolls, and the diameters of the upper backup rolls are equal. The axial center heights of the first upper backup roll at the inlet and the second upper backup roll at the inlet are equal, and the axial center heights of the first upper backup roll at the end of the outlet and the second upper backup roll at the end of the outlet are equal. The beneficial effects of the present invention are: forming a multi-linear feed roll gap that gradually decreases, so that the sheet metal reaches the maximum bending amount required for leveling; forming a straight leveling roll gap that gradually increases, and realizing a reduction in the difference in the residual bending degree after the sheet metal rebounds.

The invention discloses an improved damping joint model modeling method based on a PFC built-in model, relates to the field of civil engineering technology numerical calculation, and solves the problems of stress concentration caused by particle interlocking during rock shearing in a discrete element model, lack of a damper in a smooth joint model, single energy dissipation mode and the like. The method comprises the steps that a normal damper parallel to the normal contact force direction and a tangential damper parallel to the tangential contact force direction are added on the basis of a smooth joint model to serve as a damping joint model; the normal contact force and the tangential contact force of the damping joint model are respectively divided into a linear part and a damping part; the linear part and the smooth joint model part are completely the same, the damping part provides the viscous behavior of a contact interface, and the damping force of the damping part is generated by a damper and is calculated according to the normal and tangential critical damping ratio; the problems that a smooth joint does not have a damping system and the energy dissipation mode is single are solved.

A synthetic fiber cord construction for improving the bonding strength and performance of conveyor belts, including a central core (2) and at least three, preferably four, preferably five, in particular six, peripheral cores (1) set on the periphery of the central core (2), the six peripheral cores (1) forming a cord layer and each peripheral core (1) being in tangential contact with the central core (2), wherein the central core (2) and the peripheral cores (1) form a cord, the outer side of which is filled with a covering body (3). The synthetic fiber cord construction improves the bonding strength and performance of conveyor belts by effectively reducing the possibility of bonding failure between the reinforcement cord and the covering body; at the same time, the buffering performance of the reinforcement layer of the conveyor belt can be improved, making the conveyor belt more coordinated thus to improve its service life.

The invention discloses a method, a device and equipment for determining the tangential contact rigidity of a bolting joint surface. The method comprises the following steps: constructing a pre-tightening force relaxation model for representing the change relation of the pre-tightening force of a bolting structure along with time; respectively constructing a fractal dimension model and a surface roughness model for representing the change relation of the fractal dimension and the surface roughness of the bolted joint surface along with time based on the pre-tightening force relaxation model; based on the pre-tightening force relaxation model, the fractal dimension model and the surface roughness model, constructing a tangential contact rigidity model of the bolting joint surface, wherein the tangential contact rigidity of the bolting joint surface changes along with time; and inputting the assembly time of a to-be-evaluated target bolting structure into the tangential contact stiffness model, and calculating the tangential contact stiffness of the target bolting structure so as to evaluate the target bolting structure based on the determined tangential contact stiffness. Through the method, the tangential contact stiffness of the bolting joint surface can be calculated more accurately and reliably, and a basis is provided for accurate prediction of the time-varying characteristic of the dynamic performance of the whole machine.