4359 results about "Friction force" patented technology

The invention provides a finite element-based method for estimating pulling-out ultimate bearing capacity of a grouting screw anchor in gravelly soil, and relates to the technical field of civil structure engineering.A three-dimensional finite element model containing the grouting screw anchor and surrounding gravelly soil is established, model parameters cover the structure and material characteristics of the grouting screw anchor, and the grouting screw anchor and the surrounding gravelly soil are subjected to finite element modeling; a coordinate axis is established with the center of the anchor bottom as an original point for grid division, a stress concentration area is analyzed, principal stress is calculated to serve as critical bearing stress, vertical pull-out loads are applied step by step through a grouting pull-out test, a pull-out stress influence area is determined, soil stress of the area is analyzed, and soil binding power and friction force are calculated. And a grouting coefficient and a rock crack coefficient are generated, soil parameters are corrected, and the ultimate pulling bearing capacity of the grouting screw anchor is comprehensively obtained. According to the method, the pulling ultimate bearing capacity of the grouting screw anchor is accurately evaluated by establishing the three-dimensional finite element model and the graded loading experiment.

The invention relates to the technical field of damping and shock absorption, in particular to a damping-adjustable composite shock absorption system for textile printing and dyeing equipment, which comprises a bottom plate and a top plate, a first shock absorption unit and a movable plate are mounted between the bottom plate and the top plate, and a first buffer spring is fixedly connected between the top plate and the movable plate; a second damping unit is installed between the movable plate and the bottom plate. During damping, vibration is buffered through telescopic deformation of a first buffer spring and a second buffer spring, oil liquid is pushed to flow in backflow oil pipes through vertical movement of a first piston rod, vibration energy is consumed through friction force between the oil liquid and the backflow oil pipes, and vibration of a machine body is restrained; the different backflow oil pipes are switched to be communicated with the oil storage cavity through the switching mechanism, the longer the backflow oil pipes are, the larger the on-way resistance when oil passes through the backflow oil pipes is, the higher the damping force is, and the damping device can be conveniently installed on textile printing and dyeing equipment with different vibration intensities for damping.

The invention discloses a combined sealing device frictional wear and external leakage test bed and a test method thereof, and aims to solve the problem that the existing device cannot accurately know the sealing wear. The test bench comprises a rack, a test piece, a stay wire sensor, an oil pipe and a hydraulic system, wherein an oil tank is arranged in the rack. The test piece comprises a test sealing assembly and a plunger, and the stay wire sensor is connected with a sealing combination structure. During testing, the hydraulic system drives the plunger and the sealing assembly to move relatively, the pull wire sensor measures displacement, friction force is calculated by combining pressure data to reflect abrasion, and the oil groove collects leaked oil. According to the invention, comprehensive testing of friction, wear and leakage is realized, sealing performance and wear rules under multiple working conditions can be analyzed, the structure is convenient to observe and operate, and optimization of the sealing structure is facilitated.

The invention discloses structural part welding equipment for bridge engineering construction, and relates to the technical field of welding equipment. The structural part welding equipment for bridge engineering construction comprises a portal frame, a chute is formed in the top of the chute plate, the chute inclines upwards in the process of being away from the portal frame, a supporting plate is slidably mounted at the chute of the chute plate, and the top of the supporting plate is a plane. When the positioning mechanism positions the plate and applies pressure to the plate obliquely and downwards, the bottom of the plate is tightly attached to the top of the supporting plate, and when the plate tends to slide relative to the supporting plate due to inertia of the plate or contact between the plates in the movement process, the friction force between the supporting plate and the plate can be reduced to the maximum degree. And the supporting plate tends to slide in a chute of the chute plate, so that the supporting plate applies pressure to the plate upwards, and the movement of the plate is limited in cooperation with obliquely downward pressure application of the positioning mechanism.

A damping partition wall design method having variable friction energy dissipation, comprising the following steps: establishing an empty frame model which does not consider the lateral stiffness resistance of a partition wall, and calculating the inter-story shear force and inter-story displacement of a structure under the action of an earthquake; calculating the elastic strain energy of the structure, and determining an expected additional damping ratio provided by the damping partition wall for the structure; determining a friction damping force-sliding displacement curve of a single group of damping partition walls, and establishing a relational expression of total friction hysteresis energy dissipation and the friction damping force and target sliding displacement of the single group of damping partition walls; comparing a calculated additional damping ratio and the expected additional damping ratio to obtain the relationship thereof, and determining the friction damping force requirement of the single group of damping partition walls; designing elastic pieces; designing anti-shearing connecting pieces; and carrying out damage control verification. According to the damping partition wall having variable friction energy dissipation, parametric design and adjustment are carried out on the basis of the design goal of the structure, so that there are regulations to follow in the design of such a damping partition wall, and the anti-seismic toughness of the partition wall and structure can be synergistically improved.

The invention relates to a top-cover-free rectangular concrete body inner mold demolding device and demolding method.According to the top-cover-free rectangular concrete body inner mold demolding device, through innovative structural design, a rectangular inner mold is divided into two angle molds and two L-shaped molds, and a track extending by a specific angle (45 degrees in the horizontal direction) and an intermittent driving device are matched. During demolding, the intermittent driving device can accurately drive the two angle molds to synchronously slide inwards firstly, the contact area and friction force between the inner mold and a concrete body are effectively reduced, then the two L-shaped molds are driven to synchronously slide inwards, and the whole demolding process is completed. Compared with a traditional demolding mode, the demolding efficiency is greatly improved, and the demolding time is shortened; by the adoption of the gradual demolding mode, direct beating and violent disassembly of the mold and the concrete body are avoided, the risk that the inner mold and the concrete body are damaged is effectively reduced, the surface integrity and the internal structural strength of the concrete body are guaranteed, the service life of the inner mold is prolonged, and the production cost is reduced.

The invention belongs to the related field of valve bodies, and discloses an intrusive flow-state-controllable high-pressure ball valve which comprises a valve body, a valve element and valve rod assembly, a shaft sleeve assembly, a sealing assembly, a sealing valve seat assembly, a ball valve spring assembly and a valve body pressing sleeve. The sealing valve seat assembly and the valve body pressing sleeve seal the valve element in an overlapped mode, and the integration degree of the ball valve is improved. A threaded hole is formed between the shaft sleeve assembly and the valve body pressing sleeve assembly, so that the positioning difficulty and the ball valve mounting difficulty are reduced; the valve element assembly is matched with the valve seat sealing assembly and the sealing gasket assembly in a PEEK-titanium alloy matching mode, so that the friction force in the movement process of the valve element assembly is reduced, and the possibility of clamping stagnation of the valve element assembly is reduced; o-shaped rings are arranged among the valve seat sealing assembly, the inner wall of the valve body and the valve body pressing sleeve, good sealing performance is kept for a long time, and the service life of the deep sea high-pressure ball valve is prolonged; a certain gap is reserved between the end, with the containing area sealed, of the valve seat and the ball valve spring assembly, and it is ensured that effective sealing can be established between the valve element assembly and the valve seat.

An intraosseous access system includes an intraosseous driver having socket configured to receive a shaft of an obturator assembly. An O-ring disposed within a groove of the shaft inhibits removal of the shaft from the socket. The O-ring can be compressed within the groove to define a frictional force between the socket and the shaft. The socket can include recesses and the O-ring may expand into the recesses to inhibit removal of the shaft from the socket. The driver can include a latch mechanism configured to selectively prevent removal of the shaft and allow removal of the shaft. An adapter can be positioned between the driver and obturator assembly where the adapter includes the latch mechanism. The latch mechanism include an actuator to selectively transition the latch mechanism between a retaining state and a releasing state.

The application relates to the technical field of dust collectors, in particular to a dust collector with a crushing module, which comprises a dust collector main assembly and a rolling brush for gathering sundries, one end of the bottom of the dust collector main assembly is provided with a suction head assembly, an expansion assembly is movably connected in the suction head assembly, a crushing roller for crushing sundries is sleeved outside the expansion assembly, the expansion assembly comprises a friction block for pressing against the inner wall of the crushing roller, the suction head assembly comprises a buckle cover capable of dismounting the crushing roller from the side face, the dust collector with the crushing module is moved radially outward under the action of centrifugal force generated by the friction block when the connecting plate rotates, until the outer arc surface of the friction block presses against the inner wall of the crushing roller, the crushing roller is driven to rotate synchronously through friction, the cutting edges of the blades arranged on the surface of the crushing roller and the mechanical stoppers are staggered in the radial direction and the axial direction, when the crushing mode is switched, the larger garbage on the ground is crushed, and the cleaning effect of the dust collector is improved.

The invention relates to the technical field of lifting conveyor structures, in particular to an intelligent material lifting conveyor structure which comprises a support and an ejection anti-blocking assembly, a conveying cylinder is fixedly connected to the support, the ejection anti-blocking assembly is movably mounted in the conveying cylinder, and the ejection anti-blocking assembly is movably mounted in the conveying cylinder. Through the arranged ejection anti-blocking assembly, when any one of the first segmented barrel, the second segmented barrel and the third segmented barrel is blocked, the friction force of external blocking is larger than that of an internal anti-skid sealing ring, the synchronous rotation state between the axis pipe and the segmented barrels is relieved, the axis pipe starts to rotate independently, and the anti-blocking effect is achieved. The push block starts to rotate towards the side face from the gap between the ejector rods, so that the ejector rods are sequentially ejected upwards, materials are pushed and dredged, the blockage condition is relieved, the conveyor has the anti-blockage dredging capacity, dredging can be achieved under the blockage condition, and the practicability of the conveyor is improved.

The invention relates to the technical field of handheld gun drills, and discloses a lithium battery wireless operation gun drill which comprises a gun body, a supporting sleeve is fixedly connected to the outer wall of the gun body, a first sliding sleeve is slidably connected to the outer wall of the supporting sleeve, and a driving rod is rotatably connected to the inner wall of the gun body through a bearing; a sliding rod is slidably connected to the outer wall of the driving rod through a spline, a chuck is fixedly connected to the end, away from the driving rod, of the sliding rod, a supporting mechanism is arranged on the outer wall of the first sliding sleeve and comprises a third sliding sleeve, the inner wall of the third sliding sleeve is slidably connected with the outer wall of the first sliding sleeve, and a second positioning block is inserted into the inner wall of the third sliding sleeve. The gun body is supported through the supporting mechanism, the friction force between the gun body and the surface of the metal plate is increased, when the drill bit is stuck, the impact force generated by self-rotation of the gun body part is released to the surface of the metal plate through the pressing plate and the pressing block, and the situation that the counter impact force generated by sticking of the drill bit in the drilling process is too large is avoided.

The invention discloses a municipal bridge anti-seismic reinforcing structure and a construction method, and relates to the technical field of municipal engineering.The municipal bridge anti-seismic reinforcing structure comprises a base fixed to the top of a pier, a top plate fixed to the bottom of a bridge and a supporting column located between the base and the top plate, and the bottom of the supporting column is fixed to the base through a shearing bolt; the shear bolts are fractured, so that the supporting columns slide on the base, and shock isolation is carried out between the pier and the bridge; the bottom of the arc-shaped seat is in contact with the top of the supporting column and is an arc-shaped contact surface, and vibration force acting on the bridge drives the arc-shaped seat to swing at the top of the supporting column, so that the vibration force is counteracted by utilizing gravitational potential energy of the arc-shaped seat and friction force between the arc-shaped contact surfaces. Through arrangement of the memory alloy, the arc-shaped seats, the copper plates and the supporting columns, the shock resistance of the structure is effectively improved.

The invention belongs to the technical field of cable mounting equipment, and particularly relates to a corner position cable erecting device which comprises a main bracket and auxiliary brackets, and the auxiliary brackets are rotationally arranged on the two sides of the main bracket. The main bracket comprises a supporting plate, a limiting plate and a mounting panel, a clamping groove is formed in the supporting plate, and the clamping groove enables the supporting plate to form a C-shaped plate. Butt joint plates extending outwards are arranged at the two ends of the supporting plate, and rotating shafts are installed on the butt joint plates. Rollers are evenly arranged on the rear side of the clamping groove, limiting plates are symmetrically arranged on the front side of the supporting plate, and the limiting plates are integrally in a U shape and clamped on the top face and the bottom face of the supporting plate. According to the invention, the friction and tension of the cable can be obviously reduced, the roller with the soft wrapping layer is arranged in the wrapping groove of the main bracket, the limiting roller is arranged on the limiting plate in a matched manner, the cable can directly abut against the roller and the limiting roller during laying, and the sliding friction between the cable and the bracket is converted into rolling friction through the rotation of the roller; friction force borne by the cable in the dragging process is reduced, and cable sheath abrasion caused by traditional hard contact is avoided.

The invention provides a multi-leaf grating assembly, radiotherapy equipment and a blade locking method. The multi-leaf grating assembly comprises a frame and at least two grating blades arranged at intervals. Each grating blade is in sliding connection relative to the frame and can slide along a first direction; the device further comprises a driving device and a locking piece connected with the driving device. When the grating blade slides into the initial position in the frame, the driving device can drive the locking piece to abut against the grating blade in the second direction, and the grating blade abuts against the frame. The first direction and the second direction are perpendicular to the thickness direction of the grating blade, and the first direction and the second direction are not parallel. The driving device can drive the locking piece to abut against the grating blade so that the grating blade can abut against the frame, and therefore the grating blade is fixed through friction force between the grating blade and the frame and friction force between the grating blade and the locking piece. Therefore, mechanical collision of grating blades or weakening of mechanical collision strength in acceleration and deceleration stages of high-speed rotation of the multi-leaf grating assembly is avoided.

The invention relates to the technical field of resistance spot welding, in particular to a cement telegraph pole reinforcement cage automatic binding and welding integrated device based on PLC control. The device comprises a working rotating disc rotationally connected with a mounting support, a machining channel allowing the reinforcement cage to horizontally penetrate through is formed in the center of the working rotating disc, a conductive wheel and a pressing assembly are arranged on the same side of the working rotating disc, and the conductive wheel, the pressing assembly and the reinforcement cage form a closed conductive loop. When the diameter of the produced reinforcement cage is small, the axial component force applied to the spiral bar by the cylindrical pressing wheel is guided by the inclined plane of the groove, and forced friction is reduced. When the diameter of a produced reinforcement cage is large and the reset slope of the circular truncated cone pressing wheel presses a spiral bar, the acting direction of force is more deviated to the radial direction, the axial component force is reduced, and therefore the axial friction force is reduced. When the reset slope on the periphery of the round table roll welding wheel is in contact with the spiral rib, an inclined contact line along the conical surface is formed.

The invention provides an anti-shake motor, a camera module and electronic equipment, and relates to the technical field of shooting equipment. The anti-shake motor includes a base and a first bracket. The first support is movably connected with the base and can rotate around a first shaft relative to the base. The first axis is parallel to the second direction. The anti-shake motor further comprises a positioning ball. The positioning ball is movably connected between the base and the first support. The base is provided with a positioning groove. The positioning groove comprises three limiting faces. And the three limiting surfaces form three side surfaces of the triangular pyramid. The positioning balls and the positioning grooves are arranged in the second direction, the positioning balls are movably connected into the positioning grooves and make contact with the three limiting faces at the same time, and the first shaft penetrates through the center of the space defined by the three limiting faces. According to the anti-shake motor, positioning of the first shaft is achieved through cooperation of the positioning balls and the positioning grooves, friction force between the first support and the base is small, the first support is not prone to clamping stagnation when moving relative to the base, and the control precision of the anti-shake motor is high.

The utility model relates to the technical field of battle boots, and discloses a double-valve negative pressure drainage and exhaust battle boot which comprises a vamp. The sole is arranged below the vamp; the sole is formed by integrally bonding a drainage and exhaust hot sole, a drainage and exhaust middle sole, a drainage and exhaust sole inner layer and a drainage and exhaust sole outer layer from top to bottom in sequence through glue. The solid supporting ball body made of the supercritical foaming material is placed in the elliptic inner cavity, the supporting ball body plays a role in supporting the elliptic inner cavity, and the elliptic inner cavity is tightly attached to the ABS plastic sheet; the water and air in the inner cavity of the shoe can be discharged out of the shoe through the cooperation of the sole inner layer one-way valve and the sole outer layer one-way valve by means of pressure formed by extrusion of external force, and the problem that water cannot be effectively discharged out of the inner cavity of the shoe in the outdoor wading process of a traditional shoe is solved. The antiskid lines can increase the roughness of the surface of the outer layer of the drainage and exhaust sole so as to increase the friction force of the whole combat boot.

The invention relates to the technical field of optical transceivers, and discloses an interface connection mechanism of an optical transceiver and a use method thereof.The interface connection mechanism comprises a shell, and a plurality of first sliding grooves are formed in the side wall of the shell. At the moment, the diameter of the cable is slightly larger than the inner diameter of the L-shaped groove, certain extrusion exists between the outer skin of the cable and the inner wall of the L-shaped groove, and the second limiting block and the third limiting block can prevent the cable from sliding out after being pulled after entering the L-shaped groove. At the moment, the pulling force or the extruding force, in all directions, borne by the cable can be converted into the pressure and the friction force between the side wall of the cable and the side wall of the L-shaped groove in the first limiting block to a certain extent; and the loosening of the connection between the joint and the interface and the loosening of the welding point between the interface and the circuit board caused by the pulling force and the shaking of the cable close to the interface can be effectively reduced.

The invention discloses a winding device with a tension adjusting function for transformer production, and relates to the technical field of transformer production, the winding device comprises a pay-off rack, a positioning seat and a power seat, the pay-off rack is provided with a plurality of fixed shafts, and the fixed shafts are arranged on the positioning seat; compared with an existing winding device for transformer production, dynamic adjustment of wire tension is achieved, winding precision is greatly improved, friction force can be adjusted in real time according to the wire pay-off speed through cooperation of the brake disc at the end of the fixed shaft on the pay-off frame and the brake, it is ensured that the tension degree of the wire is stable in the winding process, and the winding efficiency is improved. The winding machine is further provided with a positioning mechanism, the positioning mechanism has an eccentricity correction function, in the winding process, if the axis of the transformer framework deviates, fine adjustment force can be applied to the end of the transformer framework through a correction assembly, so that eccentricity is automatically compensated, and the winding accuracy is improved. And the axis of the transformer framework and the axis of the ejector rod coincide again.

The present invention relates to the field of tractors, comprising: in the process of adjusting the sliding support head by the vehicle tractor, the user needs to unscrew the locking bolt, so that the front end of the locking bolt is separated from the locking screw hole of the vertical adjusting end. The friction force between the sliding support head and the vertical adjusting end can be reduced, so that the sliding support head can slide more easily; on the other hand, the talcum powder located in the talcum powder cylinder is attached to the surface of the roller, so that a layer of thin film can be formed between the contact surface of the vertical adjusting end and the sliding support head, so that the movement is smoother, and the abrasion generated by the vertical adjusting end and the sliding support head in the subsequent traction process is protected.

The positioning device comprises a disc body, the edge of the surface of the disc body is provided with a step which is formed in a protruding mode and used for supporting the edge of the wafer, a groove is formed in the position, located on the inner side of the step, of the surface of the disc body, an air inlet hole is formed in the center of the bottom face of the groove, and a negative pressure annular groove surrounding the air inlet hole is formed in the position close to the step. The air inlet hole is used for inputting air into the groove to form an air film so as to enable the wafer to be in an air floating state, and the negative pressure ring groove is configured to be suitable for providing a negative pressure environment so as to enhance the air tightness between the edge of the wafer and the step; the clamping parts are arranged on the step at intervals in the circumferential direction, the clamping parts are configured to be heating expansion bodies, the clamping parts clamp the wafer after being heated and expanded, and the clamping force is suitable for providing friction force for the wafer in the high-speed rotating state of the disc body so that the wafer can synchronously rotate along with the disc body. The method has the beneficial effects that the damage to the wafer is reduced, and particles generated in a detection environment are reduced.

The invention discloses a modular assembly type hydraulic jacking portal crane which comprises a rail device, a hydraulic jacking device and a hydraulic jacking device. The number of the walking devices is two, the walking devices are movably arranged on the left track and the right track respectively, each walking device comprises a power unit and a walking vehicle, and the power units are connected to the walking vehicles in a replaceable mode and used for driving the walking vehicles to move along the track devices; the supporting device is detachably arranged on the walking vehicle; the cross beam is detachably arranged on the supporting device; wherein the rail device, the walking device, the supporting device and the cross beam are all of modular structures and can be adaptively adjusted and assembled according to needs, and the driving friction force of the power unit relative to the rail device can be adjusted. The crane can efficiently and conveniently complete manual installation, hoisting operation and disassembly transition in a high-floor room and other scenes with limited space, the driving friction force can be accurately and efficiently adjusted, and efficient and safe load hoisting can be achieved.

The invention relates to the technical field of laser cutting machines, and discloses a motor home roof pipe fitting laser cutting machine which comprises a base. The pipe fitting is arranged on the roof of the motor home; and the laser cutting mechanism is arranged on the base and comprises a telescopic motor, the telescopic motor is arranged at the top of the base, and the output end of the telescopic motor is fixedly connected with a supporting rod. According to the laser cutting machine for the roof pipe fitting of the motor home, the laser cutting mechanism is arranged, a semi-cylindrical groove is matched with a circumferential array ball to achieve smooth sliding of the pipe fitting to adjust the cutting position, and a telescopic motor drives a supporting rod to drive a top hollow block and a side top hollow block to move downwards; after being in butt joint with the bottom hollow block and the side bottom hollow block, the ball tightly abuts against the pipe fitting to achieve stable clamping, the driving motor drives the flexible cylindrical block and the anti-skid lines to improve friction force so as to drive the pipe fitting to rotate evenly, and the cutting area is covered to effectively limit spark splashing and improve operation safety.

The invention relates to the technical field of automobile parts, in particular to a gap adjusting mechanism, a steering gear and an automobile. The gap adjusting mechanism is arranged in an installation cavity of a steering gear, a gear and a rack which are meshed with each other are further arranged in the installation cavity, the gap adjusting mechanism comprises an abutting structure and an adjusting structure, and the abutting structure is connected to the adjusting structure. Through the arranged adjusting structure, the position of the abutting structure relative to the gear is adjusted, then the gap between the gear and the rack is adjusted, and after adjustment is completed, when the automobile steering device steers and the rack moves in the length direction of the rack, due to the fact that the abutting structure can rotate around the axis of the abutting structure, the gap between the gear and the rack is adjusted. And rolling friction is generated between the abutting face and the face making contact with the rack, compared with traditional sliding friction, friction force is small, the abrasion degree of the surface (namely the abutting face) of the abutting structure is lower in long-term work, and friction abnormal noise is not prone to being generated.

The utility model belongs to the field of conveyors, and particularly relates to a corner conveyor which comprises a machine frame, a plurality of rollers are installed on the top of the machine frame through bearings, a guide seat is installed on the side edge of the machine frame through bolts, a guide plate is connected to the inner side of the guide seat in a sliding mode, and a speed reducer is fixedly installed on the guide plate. The two groups of driving flat belts, the driving wheels, the speed reducers, the guide plates, the guide seats, the tensioning wheels and the like are arranged on the side surface of the rack for mounting the roller, and then the adjusting screw rods are arranged on the guide seats, so that the height of the guide plates in the guide seats can be adjusted by utilizing the adjusting screw rods; therefore, the synchronous belt is tensioned and adjusted through the driving wheel of the speed reducer, transmission failure caused by the fact that friction force provided by the synchronous belt is smaller than resistance when the load is too large is avoided, and transmission parts such as rollers are protected against damage.

The utility model belongs to the technical field of element performance detection, and discloses a testing device. The device comprises a rack, a driving assembly, a pull pressure sensor, a displacement sensor, a force testing mechanism and a displacement testing mechanism. The driving assembly drives in the first direction. The pull pressure sensor is arranged at the driving end of the driving assembly; the force testing mechanism comprises a first connecting piece connected with the pull pressure sensor, a first shielding piece and a first execution piece, the first execution piece is used for pushing or pulling an armature of the electromagnet, the first shielding piece and the armature can move synchronously, and the displacement sensor can detect the position of the first shielding piece; the displacement testing mechanism comprises a mounting sleeve, a pressing piece and a second execution piece; the second execution piece is used for pushing or pulling an armature of the electromagnet, the second shielding piece and the armature can move synchronously, and the displacement sensor can detect the position of the second shielding piece. The device can test both the dynamic performance and the static performance of the electromagnet, is high in integration degree, and can avoid the influence of transverse friction force at the same time.

The invention discloses a plate flexible laser cutting production line and method integrating uncoiling, flattening and robot grabbing, and belongs to the technical field of metal plate machining. The plate flexible laser cutting production line comprises the steps that S1, an uncoiling and flattening mechanism, a gas-magnetic composite suspension bed and a sorting robot with a Bernoulli gripper are configured; s2, the coiled materials are fed into a suspension bed, the levelness is locked through permanent magnet attraction, and non-contact suspension and locking flat conveying of the plates are achieved in cooperation with the lifting force of a micropore air cushion; s3, laser head follow-up cutting is carried out, and plate local warping caused by thermal stress release is restrained through a permanent magnetic field; and S4, negative pressure lift force is generated through the Bernoulli effect, and when the lift force overcomes the resultant force of the magnetic attraction force, the gravity and the friction force, the workpiece is separated from the crawler belt and stripped from the framework. The air-magnetic composite suspension bed is constructed, the permanent magnet array is used for generating downward background magnetic attraction force, meanwhile, the high-pressure air bellow is used for spraying airflow through the micropore array to generate air cushion lift force, the plate is in a non-contact suspension state, and the risk of surface scratching is remarkably reduced.

The utility model discloses an anti-deformation bearing thin-wall part machining supporting and fixing structure which comprises a base and a supporting assembly, a machining table is connected to the top of the base, clamping blocks are arranged on the two sides of the top of the machining table, and the supporting assembly is arranged in the machining table and comprises a bevel gear ring and a plurality of bevel gears meshed with the bevel gear ring. A lead screw is arranged in the machining table through a plurality of rotating frames, the surface of the lead screw is in transmission connection with a supporting plate through a lead screw nut, the supporting and fixing structure is provided with a supporting assembly, a driving motor drives a bevel gear ring to rotate, a plurality of bevel gears rotate synchronously, then the lead screw is driven to rotate, and the supporting plate ascends to support the interior of the thin-wall part; by means of the internal supporting mode, pressure and friction force borne by the inner wall of the thin-wall part during polishing can be effectively dispersed, deformation caused by lack of supporting is avoided, the size precision, the shape precision and the surface quality of the bearing thin-wall part are guaranteed, the product percent of pass is increased, and waste products are reduced.

The utility model relates to the technical field of U-rib welding, in particular to a wire feeding mechanism and a U-rib internal welding wire feeding trolley, the wire feeding mechanism is installed on a U-rib internal welding machine and used for conveying welding wires wound on a wire reel to a welding gun, and the wire feeding mechanism comprises a wire feeding driving wheel connected with an output shaft of a driving motor; the wire feeding pressing wheel freely rotates around a central shaft of the wire feeding pressing wheel, and the wire feeding pressing wheel tightly presses the welding wire on the wire feeding driving wheel, so that the welding wire is pulled out from the welding wire reel by utilizing friction force and is fed to the welding gun; the point where the welding wire leaves from the welding wire reel is the discharging point of the welding wire reel, and the welding wire enters the position between the wire feeding pressing wheel and the wire feeding driving wheel from the direction in which the included angle between the welding wire and the tangent line of the discharging point is smaller than 30 degrees. The wire feeding mechanism provided by the utility model is smoother in wire feeding.

The present invention relates to the technical field of mechanical manufacturing, and disclosed are a centering fixture, machining tool and machining method for a hollow shaft. The centering fixture comprises a center rod; truncated-conical holes for matching tool centers are formed at two ends of the center rod; a first end of the center rod is provided with a truncated-conical boss for abutting against one end of the hollow shaft; a truncated-conical plug for abutting against the other end of the hollow shaft is movably fitted over a second end of the center rod; the truncated-conical plug and the center rod rotate synchronously; and a power pin for fitting a transmission rod of the tool centers is provided on the truncated-conical boss. The centering fixture for a hollow shaft provided by the present invention uses the friction force and clamping force between tool centers and a center rod of a centering fixture, and also increases a mechanical transmission mode by means of fitting of a power pin provided on the centering fixture and a transmission rod of the tool centers, thereby avoiding the problem of rotation delay of the hollow shaft during machining, and improving the finish machining effect of the hollow shaft.