11 results about "Tangential contact" patented technology

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 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 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 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.

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.

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