3551 results about "Universal joint" patented technology

A seating device with a swinging device is provided. The seating device includes a seat base, a seat, an ottoman, a backrest, and two moving linkages configured to move the seating device from a first position to a second position. Moreover, the seating device includes a swinging device configured to couple between the seat base and the two moving linkages, and drive the two moving linkages to swing relative to the seat base along a front and rear direction. The swinging device includes a swinging actuator; and an eccentric transmitter is configured to transmit a swing actuation torque to the two moving linkages, where the eccentric transmitter includes a crank and a transmission arm, the crank is configured to couple with the swinging actuator, and the transmission arm is configured to couple with the two moving linkage via a universal joint device.

The invention discloses a three-degree-of-freedom series-parallel hybrid humanoid robot waist structure, and relates to the technical field of robots. The defects that an existing multi-degree-of-freedom waist structure is not compact enough, limited in precision, low in rigidity and poor in stability are overcome. The robot comprises a yaw joint mechanism and a pitching-sidesway joint mechanism which are connected in series, upper limbs and legs of the robot are connected through the yaw joint mechanism and the pitching-sidesway joint mechanism, and the yaw joint mechanism can drive the upper limbs of the robot to do yaw motion; the pitching-sidesway joint mechanism comprises a movable platform, a static platform, a joint universal joint and two joint driving assemblies, the movable platform is fixedly connected with the upper limbs of the robot, the static platform is fixedly connected with the legs of the robot, the joint universal joint is connected with the movable platform and the static platform, and the two joint driving assemblies are symmetrically arranged on the left side and the right side of the joint universal joint; and the two joint driving assemblies are connected with the movable platform and the static platform correspondingly, and when the two joint driving assemblies drive the movable platform, the movable platform can do pitching motion and / or side-sway motion around the joint universal joint.

The invention relates to the technical field of robots, and provides a parallel connection rod driving mechanical finger with four degrees of freedom, which comprises a base, and a first driving mechanism, a second driving mechanism, a third driving mechanism and a fourth driving mechanism which are arranged on the base in parallel, the mechanical finger further comprises an MCP joint, a PIP joint and a DIP joint which are connected in sequence. The MCP joint is connected with the base through a universal joint. The first driving mechanism and the second driving mechanism are connected with the two sides of the MCP joint correspondingly so as to drive the MCP joint to conduct pitching motion and side-sway motion. The third driving mechanism is connected with the PIP joint so as to drive the PIP joint to perform pitching motion; and the fourth driving mechanism is connected with the DIP joint so as to drive the DIP joint to perform pitching motion. Four degrees of freedom have high dexterity, and the repeated positioning precision is good; high load ratio, high rigidity and high energy density are achieved, the branch chain structure interchangeability is good, the overall structure is simple and compact, and the space occupation ratio is small.

The invention discloses a polishing device and polishing equipment, the polishing device comprises a polishing mechanism and an angle adjusting mechanism, a driver of the polishing mechanism is mounted on a mounting part, and a transmission shaft is connected with the driver and can be driven by the driver to rotate around the axis of the transmission shaft; the angle adjusting mechanism comprises a universal joint and an elastic reset assembly, the universal joint is connected between the polishing component and the transmission shaft, and the polishing component is provided with a first position where the included angle between the polishing component and the transmission shaft is larger than zero degree and a second position where the included angle between the polishing component and the transmission shaft is equal to zero degree. The polishing component drives the elastic reset assembly to deform from the first state to the second state in the process of rotating from the second position to the first position, and the elastic reset assembly drives the polishing component to return to the second position in the process of recovering from the second state to the first state. The problems that the swing angle of the polishing head of the polishing machine is complex to adjust, and the workload of programmers is large are solved.

A snakelike robot for internal inspection of small pipelines comprises a head machine body and a tail machine body which are connected through a cross universal joint. Three groups of crawling driving mechanisms are uniformly distributed and fixedly mounted on each of the head machine body and the tail machine body; a supporting shaft is fixedly installed at the front end of the head machine body, a rolling brush mechanism is rotationally installed on the supporting shaft, and a rolling brush driving mechanism is fixedly installed on one side of the supporting shaft. A sealed cabin is fixedly installed at the top end of a supporting shaft on the head machine body, and a camera assembly is fixedly installed in the sealed cabin. A cleaning mechanism for the sealed cabin is detachably and fixedly mounted on the rolling brush mechanism of the head machine body, and the cleaning mechanism is in rotating contact with the sealed cabin; according to the utility model, the problem that the camera assembly is blocked by foreign matters such as chippings in the pipeline is effectively avoided, and the shooting detection sight of the camera assembly is ensured; meanwhile, through the arrangement of the rolling brush mechanism, cleaning of the inner wall of the pipeline in the advancing process is achieved, and smooth crawling of the robot is guaranteed.

A space robot ground microgravity crawling test system is characterized in that the lower end of an outer frame is fixed on the ground, the upper end of the outer frame is provided with an X / Z-axis gravity compensation module and a Y-axis gravity compensation module, the upper surface of a centroid following module is fixedly connected with a suspension rope in the X / Z-axis gravity compensation module through a tension sensor, and the lower surface of the centroid following module is fixedly connected with a space crawling robot through a universal joint and a spherical hinge; the space crawling robot conducts a space microgravity crawling test on the target simulator, the target simulator is placed on the ground through universal wheels, and when the robot crawl, the target simulator moves in an X / Y mode and rotates around the Z axis under the counter-acting force, so that three-degree-of-freedom space microgravity simulation conditions are provided. Meanwhile, the X / Z-axis gravity compensation module and the Y-axis gravity compensation module can realize micro-gravity compensation autonomous following of the space crawling robot in the X / Y / Z directions, and the mass center following module can realize that the mass center of the robot is always on a suspension point extension line when the posture and the configuration of the robot are changed.

The invention relates to the technical field of universal joint fork lug hole grinding, and discloses a universal joint fork lug hole grinding device which comprises a workbench, a fixing mechanism used for fixing a universal joint fork and two grinding mechanisms provided with grinding machines in a clamping mode are arranged on the workbench, and the fixing mechanism comprises a rotating ring rotationally connected to the workbench; gear teeth are arranged on the outer side of the rotating ring, a jacking device and a supporting device are arranged on the inner side of the rotating ring, a jacking block is arranged in the jacking device and provided with a jacking face, a supporting seat is arranged in the supporting device, a shaft rod part of the universal joint fork slides in the supporting seat, and a supporting spring is further arranged in the supporting seat. The jacking block is used for pushing the earhole to the position concentric with the rotating ring, the rotating ring is driven by the connecting driving mechanism to rotate, and a grinding head on the grinding machine is tangent to the side, close to the jacking device, in the earhole. The device has the advantages that the lug hole is accurately positioned, the polishing head and the yoke rotate simultaneously to improve the polishing precision, and the polishing strength can be adjusted.

The invention belongs to the technical field of pipeline inner wall cleaning, and particularly relates to a self-adaptive pipe diameter adjusting type petroleum oil pipe intelligent cleaning robot which comprises a shell, and the shell is composed of a left shell body and a right shell body which are the same in structure. According to the supporting mechanism, a bidirectional threaded rod linkage structure hinged through a universal joint is adopted, and an electromagnetic cylinder and a moving block are matched to cooperatively control supporting legs to stretch out and draw back dynamically, so that the device is adaptive to different pipe diameters and bent pipe forms, and the device can be stably attached in a round pipe, an oval pipe or a bent pipe; the driving mechanism is based on bevel gear transmission and is combined with a radial pressure compensation mechanism to realize the multidirectional moving capability of vertical climbing and horizontal propelling; the exploration mechanism is integrated with a two-degree-of-freedom holder, and the cleaning process is monitored in real time through axial looking and radial pitching scanning in cooperation with self-adaptive light supplement; the cleaning mechanism innovatively integrates a rotary cutting drill bit, an adjustable blade set and a high-speed brush roller, the operation radius is dynamically adjusted through an extension rod, and stubborn scaling crushing, pipe wall scraping and chipping sweeping are synchronously completed.

The bevel groove edge milling device suitable for auxiliary welding of the LNG pressure container solves the problems that the workload of double-face edge milling is large, edge milling movement guiding cannot be achieved, edge milling is prone to shifting, and the edge milling accuracy is poor, the bevel groove edge milling device comprises an edge milling rack and a mounting rack, and a second mounting rack and a first mounting rack are fixedly mounted on the inner side of the mounting rack; an upper clamping plate is welded to one side of the mounting frame, a positioning frame is welded to the inner side of the upper clamping plate, a driving set and a driven shaft are movably mounted on the inner side of the positioning frame, a transmission frame is slidably connected to the inner side of the positioning frame, a first driving bevel gear rotates in the transmission frame, and first driven bevel gears are arranged on the surfaces of the driven shaft and the driving set; a universal joint is arranged between the two first driving bevel gears, and a milling cutter is installed at one end of the driving set and one end of the driven shaft, the milling cutter connected with one end of the driving set is driven to rotate through conventional driving work of the driving set, and meanwhile when the driving set is driven to work, the milling cutter is driven to rotate. And the first driving bevel gear and the first driven bevel gear which are matched with the driving set can be driven to rotate in a meshed mode.

The invention discloses an automobile transmission shaft dynamic balance detection device, and belongs to the technical field of transmission shaft detection, the automobile transmission shaft dynamic balance detection device comprises a detection table, the detection table is provided with two moving blocks, the moving block on one side is provided with dynamic balance detection equipment, and the equipment passes through a rotating first electric clamping jaw; according to the coaxial positioning mechanism, through transmission cooperation among a first bevel gear, a second bevel gear and a third bevel gear in the coaxial positioning mechanism, when the first bevel gear is driven, the second bevel gear can be driven to rotate, and then the third bevel gear and the first bevel gear rotate in the opposite directions; in the transmission process, the second rotating rod below the driving rod and the first rotating rod below the driving sleeve can rotate, and the rotation of the second rotating rod and the first rotating rod can drive the positioning clamping blocks at the two ends to clamp the two sections, with the universal joint as a grading line, on the transmission shaft, so that horizontal transmission of the transmission shaft is guaranteed, the coaxiality of the universal joint is improved, and interference to middle section detection is reduced.

The invention relates to the technical field of assembly, in particular to a universal joint assembly method and system. The method comprises the step of triggering based on an assembly instruction to drive the retainer to move towards the mounting part in the direction from the clamping groove to the mounting part. And on the basis that the inner circumferential surface of the retainer abuts against the outer circumferential surface of the mounting part and the retainer is located on the side, close to the clamping groove, of the mounting part, the press-fitting unit drives the retainer to move in the direction from the clamping groove to the mounting part till the retainer stops. And on the basis that the retainer stops, the detection module is driven to move in the direction from the clamping groove to the mounting part. And on the basis that the detection module abuts against the snap spring, the relative position of the detection module and the snap spring is obtained. And obtaining a detection result of the snap spring based on the relative position of the detection module and the snap spring. Therefore, the problem of how to improve the assembling efficiency of the universal joint is solved.

The system, for irregular shaped parts such as a thin-walled combustion chamber, includes a self-positioning device (I-1-4, Figure 13) with three ball heads (I-1-4-6, Figure 15) connected around an ax

The utility model discloses a universal joint mounting device capable of accurately positioning, relates to the technical field of universal joint mounting, and aims to solve the problems that an existing device has limitation in the aspect of adapting to quick clamping and positioning of cross shafts with different sizes, and the mounting efficiency of a universal joint needs to be improved. A plurality of supporting rods are fixedly connected to the upper surface of the supporting bottom plate, a containing plate is fixedly connected to the upper ends of the supporting rods, a movable base plate is arranged between the supporting bottom plate and the containing plate, and the two ends of the lower surface of the movable base plate are each fixedly provided with a lifting air cylinder; the telescopic end of the lifting air cylinder is fixedly connected to the lower surface of the containing plate, and a four-claw clamping air cylinder is fixedly installed in the middle of the upper surface of the movable base plate. And the effects that the cross shafts of different sizes can be rapidly clamped and positioned, and the installation efficiency of the universal joint is effectively improved are achieved.

The utility model discloses a detection device suitable for oil gas pipeline magnetic flux leakage, which comprises a probe magnet section, three groups of universal joints, a battery section and a pulley, the universal joints are arranged on two sides of the probe magnet section, the battery section is arranged on the right side of the universal joints, another group of universal joints is arranged on the right side of the battery section, and the pulley is arranged on the other group of universal joints. Three groups of pulleys are arranged on the right side of the universal joint, and a cleaning assembly is arranged at the left end of the universal joint on the left side of the probe magnet section. A cleaning assembly is arranged at one end of a universal joint on the left side of a probe magnet joint, so that an extrusion plate in the cleaning assembly rotates on a threaded rod in a threaded mode and extrudes a rotating rod, the rotating rod rotates in a fixing block and drives a scraper to be attached to the inner wall of a pipeline, and then a transmission rod is driven by a motor to rotate; and the scraper blade is used for cleaning attachments on the inner wall of the pipeline, so that interference on the probe magnet section during use is reduced, and the accuracy of a detection result of the probe magnet section is further improved.

The utility model provides a counter weight device, relates to fitness equipment technical field, including frame and link mechanism, the upper end of frame outside is equipped with central rotating shaft, the inside of central rotating shaft is rotatingly equipped with position adjusting disc, and the outside of central rotating shaft is rotatingly equipped with arm of force. A plurality of groups of positioning holes are formed in one end in the position adjusting disc; the single-acting and double-acting torque output device is formed by matching the frame upper force arm, the position adjusting disc and the connecting rod mechanism, single-sided torque output can be achieved by independently using a single-sided structure, double-sided torque output can be achieved by connecting the middle and the two sides to form an integral frame, and the single-acting and double-acting functional requirements in strength training equipment are met. The torque shaft and the training device are connected through the universal joint, the output torque is output in all directions through the flexibility of the universal joint, the universal modular design of the hanging piece counterweight device is achieved, and the hanging piece counterweight device is suitable for strength training devices of different types.

The invention relates to the technical field of robots, and discloses a waist omni-directional driving assembly for a humanoid robot and the humanoid robot, the waist omni-directional driving assembly for the humanoid robot comprises a base, a driven shaft, a cross shaft universal joint, two waist omni-directional joint modules and two crank rocker mechanisms; the two waist omni-directional joint modules are rotatably connected with the two ends of the second rotating shaft respectively, the two waist omni-directional joint modules are coaxially arranged and approximately symmetrically distributed on the two sides of the second rotating shaft, motors of the two waist omni-directional joint modules are arranged adjacently, the output ends of speed reducers are arranged oppositely, and the second rotating shaft is parallel to the driven shaft; crank parts of the two crank and rocker mechanisms are fixedly connected with output flanges of the two speed reducers respectively, and rocker parts of the two crank and rocker mechanisms are hinged to the two ends of the driven shaft respectively. Effective transmission force arms at the two ends of the equivalent lever under the working condition of trunk roll motion are prolonged, the torque output requirement for the joint module is reduced, and the control precision is improved.

The utility model relates to a machining device for a universal joint fork expansion joint, and belongs to the technical field of universal joint fork machining equipment. A positioning block is fixedly mounted on the bottom plate, a sliding part is slidably mounted on the bottom plate on one side of the positioning block through a sliding rail, tension springs are symmetrically arranged between the sliding part and the positioning block, a pushing part is mounted on the bottom plate on one side of the positioning block, and a cutting part is mounted on the bottom plate on one side of the sliding block. According to the machining device, a universal joint fork can be conveniently and rapidly positioned through a first receding groove of a positioning block, clamping of the universal joint fork can be achieved through mutual cooperation of a sliding block, a positioning pipe, a tension spring and a pushing head, and therefore the problem that when the universal joint fork is manually held by hand for expansion joint machining, fingers of a worker are prone to being cut is solved; the sliding block, the positioning pipe, the tension spring, the pushing head and the universal joint fork are pushed to the position below the cutting piece through the piston rod of the pushing air cylinder, the universal joint fork is cut through the cutting cutterhead to form an expansion joint, and therefore the joint cutting consistency of the expansion joint on the universal joint fork can be guaranteed.

The invention relates to the technical field of mooring equipment, in particular to a floating platform tension leg mooring system which comprises at least three sets of tension tendons connected with a floating platform, and each tension tendon is composed of a steel cable locking device, a steel cable, a mooring connecting arm and a universal joint base from the upper platform end to the lower anchoring end. The tension tendons are connected with the floating platform through the steel cable locking devices, accurate adjustment of tension is achieved through the tension adjusting locking connectors, the tension consistency of the tension tendons is achieved, the tension adjusting locking connectors can be locked on the steel cable locking devices, and one ends of the tension adjusting locking connectors are directly connected with the steel cables. According to the floating platform tension leg mooring system, through the design of the tension adjusting locking connectors, the tension of each group of tension tendons can be accurately adjusted, and it is ensured that the tension of each group of tension tendons is kept consistent. Therefore, the stability and the reliability of the whole mooring system are improved, and the platform movement deviation caused by uneven tension is reduced.

The invention provides an intelligent leveling and ground pressure self-adaption system of a modularized movable laboratory, and relates to the technical field of laboratory leveling, the system realizes high-precision leveling through six-degree-of-freedom hydraulic support legs, is equipped with pressure and displacement sensors, and is combined with spherical hinge universal joints to compensate ground inclination. And the reliability and the safety of the system are improved through the backup design of the double hydraulic pumps and the energy accumulator. The system further has a ground pressure self-adaption function, the pressure of the supporting legs is dynamically adjusted based on the ground type and a bearing capacity model, local overload is prevented, and an anti-sedimentation strategy is set. In addition, the system integrates technologies of Beidou / GNSS positioning assistance, multi-modal data fusion, block chain traceability and the like, and the leveling efficiency, stability and traceability are enhanced. The system is suitable for mobile laboratory deployment under complex terrains, and has the characteristics of high efficiency, accuracy and reliability.

The invention relates to the technical field of universal joints, in particular to a universal joint pull-out force measuring method and system. The method comprises triggering based on a test instruction to drive the universal joint to move until one end, close to the shell of the universal joint, of the transmission part of the universal joint abuts against one end, away from the second detection module, of the first detection module. The end, close to the shell of the universal joint, of the transmission part based on the universal joint abuts against the end, away from the second detection module, of the first detection module, and the second driving unit drives the second detection module to move in the direction away from the first detection module to abut against the shell. Based on abutting of the second detection module and the shell, the distance between the driving transmission part and the shell is increased to a set distance. On the basis that the distance between the driving transmission part and the shell is increased to the set distance, the maximum value of the driving force in the process that the distance between the driving transmission part and the shell is increased to the set distance is obtained. Therefore, the problem of low measurement efficiency of the pull-out force of the universal joint is solved.

The utility model discloses a universal joint relates to universal joint technical field, including joint body, also including limit mechanism and clamping mechanism, joint body includes fixed seat, the top of fixed seat is equipped with the mounting rod, the outside of mounting rod top is equipped with the connecting rod, the limit mechanism includes the rotating plate, and the rotating plate is equipped with the connecting rod. The rotating plate is arranged at the top of the mounting rod, four traction plates are mounted on the periphery of the top of the rotating plate, a limiting plate is mounted at one ends of the four traction plates, the clamping mechanism comprises two movable plates, the two movable plates are arranged at the two ends of the inner wall of the fixed seat respectively, and clamping plates are mounted at the opposite ends of the two movable plates. The fixing sleeve can be fixed through the limiting plate, so that the structure of the connector body is more stable, the connector body can be connected with the two connecting shafts through the arrangement of the fixing seat and the connecting rod, and the connection between the connecting shafts and the fixing seat is firmer through the arrangement of the clamping plate.

The invention relates to an angle module and a reconfigurable all-wheel independent steering drive-by-wire chassis, the angle module comprises an angle module frame, a steering motor, a controller of the steering motor, a ball cage universal joint, a steering arm, a hub motor, a controller of the hub motor, a suspension unit, a brake unit and a battery, the suspension unit comprises an upper swing arm, a lower swing arm and a damping spring, the steering motor is connected with the upper swing arm, the upper swing arm is rotationally connected with an upper section bar of the angle module frame, the lower swing arm is connected with the steering arm through a spherical hinge, and the damping spring is connected with the steering arm. The lower swing arm is rotatably connected with the lower profile of the angle module frame; the upper and lower ends of the damping spring are rotatably connected with the angle module frame and the lower swing arm respectively; and the angle modules and the connecting modules are spliced to form the drive-by-wire chassis. According to the angle module and the drive-by-wire chassis, modular design is adopted, all-wheel independent steering can be achieved, and the size, configuration and dynamic performance of the chassis can be flexibly adjusted.

The invention relates to the technical field of seabed base adjusting platforms, and discloses a seabed base self-adaptive leveling device and method based on shape memory alloy, and the device comprises a seabed base observation platform which is used for bearing instruments and equipment; the leveling supporting legs are uniformly distributed below the seabed-based observation platform and are used for realizing shock isolation and shock absorption and full-automatic and high-reliability leveling after the seabed-based observation platform touches the bottom by utilizing the shape memory effect and the superelasticity of SMA (Shape Memory Alloy); and the universal joint connecting mechanism is used for connecting the leveling support leg with the foot pad so as to adapt to and support slopes with different angles. The shape memory effect and the hyperelasticity of SMA are utilized, under the condition that an external power source and a complex control system are not needed, full-automatic and high-reliability leveling after the platform touches the bottom is achieved, and the technical problems that according to an existing leveling scheme, limitation of different degrees exists in the aspects of structure complexity, environment adaptability, long-term reliability and leveling precision are solved.

The invention discloses a concrete temperature stress testing machine for compensating ambient temperature, which belongs to the technical field of concrete temperature strain test and comprises a testing machine host, a heat insulation box, a sealing sleeve, a water-cooling temperature control system and an active compensation system. Through the combination of the heat preservation box and the sealing sleeve, the concrete test block, the fixed-end universal joint, the movable-end universal joint, the fixed chuck, the movable chuck, the load sensor and other core test parts are sealed in the heat preservation box and the sealing sleeve, an independent internal constant-temperature test area is constructed, and the idealized premise that temperature changes of all the parts are consistent in the prior art is broken through; meanwhile, a water-cooling temperature control system composed of a first water cavity, a through groove, a second water cavity, a water injection pipe and a water drainage pipe is arranged among the first fixing base, the second fixing base and the sliding rod, it is ensured that the external temperature is constant, and the water-cooling effect is good. The problem of superposition of external deformation and deformation of the test piece and the internal part is thoroughly avoided.

A tool adapter assembly, such as, for example, a socket or socket adapter, having drive, center, and work bodies. The drive body and the work body can be adjusted in a number of positions / angles relative to one another by a user. The tool adapter assembly includes components adapted to retain a set / desired position / angle of the drive body and the work body relative to one another.

The invention provides a horizontal limb joint rehabilitation physiotherapy device, and relates to the field of limb joint rehabilitation physiotherapy. A horizontal limb joint rehabilitation physical therapy device comprises a fixing plate which serves as a supporting structure for horizontal limb joint rehabilitation physical therapy, supporting seats which are evenly distributed are installed at the bottom of the fixing plate, and first ball cage type universal joints used for driving an upper limb assembly and a lower limb assembly to rotate are installed on the two sides of the fixing plate and the two sides of one end of the fixing plate; the two driving assemblies are arranged at the two ends of the top of the base correspondingly and used for driving the upper limb assembly and the lower limb assembly; and the ankle joint assembly is mounted at one end of the lower limb assembly and drives the ankle back to stretch and the plantar flexion through a servo motor. The upper limbs and the lower limbs can be driven to conduct rehabilitation training through the driving assembly, and meanwhile rehabilitation training can be conveniently conducted on one sides of the upper limbs and one sides of the lower limbs through cooperation of a first electromagnet, a first magnet, a second electromagnet and a second magnet.

The two-degree-of-freedom finger mechanism of the five-finger manipulator is suitable for five-finger manipulator equipment of a humanoid robot and serves as a ring finger and little finger module. The robot consists of two parts, namely a finger bending assembly and a finger swinging assembly. The finger bending assembly drives a ball screw nut pair through a driving motor to convert rotary motion into linear motion, and then a ball nut drives an elastic connecting rod and finger joints to achieve bending motion of fingers. The finger swinging assembly drives a bevel gear set through a driving motor, and after the direction of rotating motion is changed, a connecting rod and finger joints are driven through a universal joint to achieve the swinging action of fingers. According to the two-degree-of-freedom mechanical finger, the two assemblies are ingeniously combined to one finger, and the overall size of the mechanical finger is reduced while two-degree-of-freedom movement is achieved. And in combination with the use of the elastic connecting rod, the driving motor is protected, and the action area of the manipulator and the grabbed object is increased.

The invention relates to the technical field of universal joint machining, in particular to a three-pin-column machining method and system. The three-pin column is positioned and clamped on the clamping assembly; wherein positioning and clamping comprise the steps that a positioning unit of the clamping assembly abuts against two supporting shafts of the three-pin column, and a second clamping unit of the clamping assembly expands a connecting hole of the three-pin column; a supporting shaft, at the machining position, of the three-pin column is machined; the positioning unit relieves the abutting of the two supporting shafts, and the second clamping unit drives the three-pin column to rotate until one of the two unmachined supporting shafts reaches the machining position; the positioning unit abuts against the two supporting shafts of the three-pin column, and the supporting shaft at the machining position is machined. In this way, the problem that the machining efficiency of the three-pin column is low is solved.

The invention relates to the technical field of transmission shaft machining, and discloses an intelligent clamping method and system for universal joint transmission shaft machining. The method comprises the steps that the geometric dimension, the form and location tolerance number, vibration signal data, unbalance data and pressure distribution data of a transmission shaft are obtained; performing precision correction based on preset machining precision to obtain transmission shaft positioning parameters; adjusting parameters in real time through an adaptive control algorithm to obtain real-time positioning parameters; performing feature extraction to obtain vibration spectrum features; outputting a vector diagram to obtain an unbalanced vector diagram; performing Kalman filtering processing to obtain filtering parameters; calculating by adopting a fuzzy control algorithm to obtain a vibration compensation amount and an unbalance correction amount; performing data processing to obtain a corrected pressure matrix; inputting into a pre-trained neural network model to obtain a predicted risk level; and risk prediction and judgment are carried out, clamping strategy adjustment is carried out, a corrected clamping strategy is obtained, machining of the transmission shaft is carried out, and the machining accuracy is improved.

The invention discloses a high-temperature and high-pressure fluid lubrication rotating plane frictional wear testing device, and belongs to the technical field of extreme working condition tribology testing. The device is characterized in that a lifting device and a loading cylinder are simultaneously fixed at the top of a test stand bracket, a piston rod of the loading cylinder is connected with a tension sensor and a water-cooling loading shaft, and the water-cooling loading shaft is connected with a lower sample piece (static ring) in a high-temperature and high-pressure test cavity through a spherical universal joint; the oil-cooling main shaft is fixedly connected with an upper sample piece (moving ring) in the high-temperature and high-pressure test cavity through a locking nut, so that the axial load of the water-cooling loading shaft and the oil-cooling main shaft in a non-concentric state can be uniformly loaded, and the end surfaces of the upper sample piece and the lower sample piece can be automatically attached to each other. The upper part of the high-temperature and high-pressure test cavity is connected with the water-cooling jacket, and the lower part is connected with the bearing cavity. High pressure of the test chamber is guaranteed by a high-pressure water station system, and high temperature is adjusted and controlled by an electric heater and a water cooling jacket. The device can realize the rotary sliding friction wear test of a friction pair in a high-temperature and high-pressure water environment.