389 results about "Contact friction" patented technology

The invention relates to the field of electro connecting pressure gauges, in particular to an electro connecting pressure gauge with an alarm function, which comprises an external pipeline connected with an external pressure pipeline, the outer end face of the external pipeline is fixedly connected with a dial plate, and a transparent shield is embedded and matched on the dial plate; the pointer adjusting mechanism is used for adjusting the position of the pointer, and the pointer adjusting mechanism is arranged in the center of the transparent shield; the pointer mechanism is used for carrying out alarm processing when an upper limit is exceeded or a lower limit is lower, and the pointer mechanism is arranged on the dial plate and is protected by the transparent protective cover; wherein the pointer adjusting mechanism comprises a circular groove, the circular groove is formed in the top of the transparent protective cover, and according to the electric contact pressure gauge with the alarm function, a friction damper (such as metal sheet contact friction) is arranged on a reset path, vibration energy is consumed through friction, and impact and residual vibration of the second bourdon tube in the reset process are reduced.

The invention discloses an air floatation lifting rotating platform, and belongs to the technical field of precise instruments, the platform comprises a base, a slide block and an objective table, the slide block maintains a suspension state in the base through gas power and can respond to an external load in the vertical direction to carry out position adjustment, and the objective table and the slide block are in isolated contact through a gas film. The objective table can rotate in a plane parallel to the surface of the sliding block, the sliding block comprises a shell, a thrust bearing is arranged on the upper portion of the shell, a radial bearing is arranged on the inner side of the thrust bearing, the objective table is in clearance fit with the upper surface and the lower surface of the thrust bearing to form a cavity, and the objective table is in clearance fit with the inner side of the radial bearing to form a cavity. The thrust bearing is provided with an air path for releasing high-pressure air to the cavity, and the objective table is connected with a motor. According to the invention, the contact friction is reduced, the lifting precision and the rotating precision are improved, and the wafer detection alignment efficiency is improved.

The invention discloses a capacitance method measuring device and method for the thickness of a lubricating oil film between mechanical friction pairs based on a dynamic correction model, and belongs to the technical field of electrical measurement. Wherein the point contact ball disc testing machine comprises a point contact friction pair formed by a conductive disc and a steel ball; the conductive disc is electrically isolated by arranging insulating rubber pads on the upper surface and the lower surface of the conductive disc, and the steel ball is electrically isolated by arranging an insulating ceramic ball bearing in a transmission mechanism where the servo motor is connected with the steel ball. The two independent servo motors respectively drive the steel ball and the conductive disc to rotate, so that test working conditions at different speeds can be realized. According to the invention, the capacitance distribution in the Hertz contact area can be effectively calculated, the problem of measurement errors caused by peripheral capacitance interference of the Hertz contact area in a traditional capacitance method is solved, and accurate measurement of the oil film thickness between common metal friction pairs in engineering is realized.

The invention provides a winding anti-loosening and unfolding orienting device for a flexible stretching rod and a using method thereof.The winding anti-loosening and unfolding orienting device comprises wedge blocks, wedge block seats, a winding cylinder, the flexible stretching rod, an adapter shaft, a connecting rod and a guide wheel, the multiple wedge block seats are symmetrically arranged on the two sides of the winding cylinder, and the flexible stretching rod is arranged on the winding cylinder from inside to outside in a winding mode; a plurality of wedge blocks are symmetrically installed on the two sides of the flexible stretching rod, and the wedge blocks on the wound flexible stretching rod are stacked layer by layer and locked on the wedge block base to form a wedge block set. The wedge blocks and the wedge block bases are interlocked in the tangential direction and the transverse direction, the tangential displacement and the transverse displacement between the rings are limited, and disordered expansion and scattering of the flexible stretching rods under the action of the elastic energy of the flexible stretching rods and mutual contact friction of flexible stretching rod bodies between the rings are prevented; orderly fixation of folding and winding and orientation of unfolding of the flexible stretching rod are ensured; the structure is simple and reliable, the additional mass is small, and the usability and reliability of the flexible stretching rod serving as a stretching mechanism are improved.

The invention discloses a polishing device and a polishing method for a blue glass optical filter, and relates to the field of polishing equipment. The upper polishing disc and the lower polishing disc are used for polishing the upper face and the lower face of a workpiece at the same time, the two faces of the workpiece can be polished at the same time, the polishing efficiency of the workpiece can be improved, the workpiece is positioned through the positioning grooves in the jig disc, and the situation that the workpiece moves disorderly under the friction force effect during polishing is prevented; during polishing, the jig disc can be driven by the planetary driving unit to drive the workpiece to do circular motion and self-rotate, it can be ensured that the two faces of the workpiece are evenly stressed, excessive abrasion of the single face of the workpiece is avoided, and therefore the polishing effect of the workpiece is further improved; during polishing, the lifting frame drives the jig disc to move upwards, so that the bottom surface of the jig disc is separated from the top surface of the lower polishing disc, abrasion of the jig disc and the lower polishing disc caused by continuous contact friction between the bottom surface of the jig disc and the lower polishing disc during polishing is prevented, and the service life of the jig disc and the service life of the lower polishing disc are prolonged.

The invention relates to the technical field of petroleum equipment, and particularly discloses an oil and gas well spherical milling head and a using method thereof.The oil and gas well spherical milling head comprises a milling head body, and the outer side surface of the milling head body is fixedly connected with first milling blocks distributed in an annular array; the upper surface of the milling head body is fixedly connected with a mounting block which is coaxially arranged; the mounting block is provided with a supporting and moving mechanism which is elastically supported towards two sides, free ends of two sides of the supporting and moving mechanism are provided with first sliding balls which are in rolling contact with a well wall, the mounting block is provided with pneumatic supporting mechanisms which are distributed towards the outer side in a divergent shape, and the free ends of the pneumatic supporting mechanisms are provided with second grinding and milling blocks. The radial grinding and milling block can be pneumatically supported and adjusted according to the construction pipe diameter, so that the radial grinding and milling block is suitable for construction of various pipe diameters, the application range is wide, the contact friction between the radial grinding and milling block and the well wall when the radial grinding and milling block moves in the well is reduced in an elastic supporting and righting mode, and the radial grinding and milling block has the advantage of protecting the well wall.

A selectively frictionally engaged hole cover for a bore hole cored from a paved surface that includes a cover plate configured to cover the bore hole and support vehicular traffic. An engagement mechanism is attached to the cover plate and extends down into the bore hole. The engagement mechanism is configured to be actuated by a user torque input that causes an engagement plate selectively shiftable relative to the cover plate to thereby shift an engagement member along a engagement member stop and thus radially outwardly or inwardly, causing the engagement mechanism to selectively engage or disengage the wall of the bore hole. When the engagement member is in frictional contact with the hole, unintentional extraction of the engagement mechanism is prevented. The selectively frictionally engaged hole cover effectively provides a temporary cover for a bore hole in a road, parking lot, or other paved surface.

The invention provides a cable dragging anti-friction device for power construction, and belongs to the technical field of cable protection devices.The cable dragging anti-friction device comprises a supporting frame, a rotating roller is arranged on the supporting frame, a drawing frame is slidably installed on the supporting frame, a supporting plate is arranged on the drawing frame, two arc-shaped limiting grooves are formed in the supporting plate, and a corner auxiliary part is installed on the supporting plate; the corner auxiliary part comprises four first U-shaped supporting plates, two of the four first U-shaped supporting plates are fixedly installed on the supporting plate, the other two of the four first U-shaped supporting plates are slidably arranged in the two arc-shaped limiting grooves correspondingly, and rotating rollers and inclined rollers are installed on the first U-shaped supporting plates correspondingly. A cable can be supported and limited through the rotating rollers and the inclined rollers, contact friction between the cable and a building or other objects is prevented, an operator can prolong or shorten the overall length of the supporting frame according to actual needs through the design of the drawing frame so that the supporting frame can adapt to cables of different lengths, and the practicability of the device is improved.

The invention discloses a near-net forming friction welding method for a dissimilar metal stud based on a middle layer, which comprises the following steps of: pre-processing a similar T-shaped boss with a thread or a circular truncated cone-shaped boss without a thread section on the end surface of a workpiece with high hardness, and pre-processing a corresponding similar T-shaped groove or a circular truncated cone-shaped groove on the end surface of a workpiece with low hardness; and before welding, middle-layer alloy is placed at the upper end and the bottom of the T-like groove or the bottom of the circular-truncated-cone-shaped groove, and the welding steps comprise rotary pressing, rotary pressing and friction, sudden stop and upsetting. The intermediate layer alloy is used as a medium, direct contact friction of a welded workpiece is avoided, surface oxidation films of adjacent base metal are broken and gaps are filled through severe plastic deformation of the intermediate layer under rotary extrusion of the workpiece, and effective welding under the conditions of low upsetting friction pressure and no obvious deformation of the workpiece is achieved. And a dissimilar metal welding interface is prevented from being overheated to generate an overthick intermetallic compound, subsequent machining is omitted, near-net forming of a friction welding joint is achieved, and the production efficiency is improved.

The invention relates to the field of foundation detection, in particular to an impact-controllable foundation strength detection device and method for building construction, and the device comprises a steel chisel main body, an annular transmission block, a piercing hammer and a coaxial release mechanism; the coaxial releasing mechanism comprises a coaxial connecting ring, a plurality of force applying structures and a buffering assembly, the coaxial connecting ring is coaxially connected with the steel chisel body, a plurality of lifting lugs are arranged on the coaxial connecting ring at equal intervals, the force applying structures are arranged on the lifting lugs correspondingly, the force applying structures are used for applying radial acting force to the piercing hammer, and the buffering assembly is used for buffering the piercing hammer. The acting force applied to the piercing hammer by the force application structures is the same in magnitude, and the buffer assembly is connected with the coaxial connecting ring and the steel chisel body and used for reducing vibration borne by the coaxial connecting ring. The steel chisel is provided with the steel chisel body, the piercing hammer and the coaxial release mechanism, so that energy loss caused by eccentricity or contact friction of the piercing hammer is avoided, and the impact amount of the piercing hammer is precisely controllable.

The utility model belongs to the technical field of welding robots, and particularly relates to a welding robot moving track which comprises a base, a first telescopic rod is fixedly connected to the left side of the upper end of the base, a lug plate is fixedly connected to the right side of the first telescopic rod, and a sliding plate is fixedly connected to the upper end of the lug plate. The lower end of the sliding block is in rolling connection with the balls, the balls support the sliding block to prevent the lower end of the sliding block from generating surface contact friction with the upper end of the base, the balls are in rolling connection with the interior of the arc-shaped groove, and therefore surface friction sliding between the sliding block and the base is converted into rolling contact sliding, and the contact area of the friction position is reduced; friction resistance is reduced, sliding of the workbench is facilitated, the contact face is protected, the lower end of the workbench is connected through a motor shaft, the workbench is conveniently driven to rotate, and therefore a robot at the upper end of the workbench is conveniently driven to rotate, and welding work can be conveniently conducted on different positions of the robot at one position.

To provide a vibration type actuator capable of improving wear resistance and being stably driven in a vacuum environment such as cosmic space and a vacuum device.SOLUTION: A vibration type actuator includes: a vibrating body having a rectangular elastic body and an electromechanical energy conversion element; and a contact body in contact with the elastic body, and is configured such that the contact body and the vibrating body relatively move by vibration of the vibrating body. With the elastic body, a flat plate portion and a protruding portion having a top portion and a wall portion are integrally formed, and both ends or the entire circumference of the top portion is supported by the wall portion. A friction material different from the elastic body is provided on the top portion so as to come into contact with the contact body. The friction material is a sphere or a cylinder. The friction material is supported with respect to a slope formed on the top portion.SELECTED DRAWING: Figure 3

The utility model discloses a conveying device for lead frame processing, which belongs to the technical field of lead frame processing and comprises a conveying frame, a plurality of rotating shafts are rotatably arranged in the conveying frame, a protective shell is arranged on the outer side of the conveying frame, one end of each rotating shaft penetrates into the protective shell and is sleeved with a chain wheel, and the other end of each rotating shaft is sleeved with a chain wheel. The multiple chain wheels are in transmission connection through a chain, the outer sides of the multiple rotating shafts are symmetrically sleeved with rolling wheels, the rolling wheels are fixedly connected with the rotating shafts through bolts, bosses used for bearing the lead frame are arranged on the inner sides of the rolling wheels, and an adjusting assembly used for adjusting the installation distance between the rolling wheels on the rotating shafts is arranged in the conveying frame. The lead frame conveying device has the advantages that the lead frame is placed on the boss to be conveyed by arranging the rotating shaft, the idler wheel and the boss, a silver plating area of a product is in a suspended state and does not make contact with the boss and the rotating roller, contact friction of the silver plating area is avoided, and the percent of pass of the product is further improved.

A selectively frictionally engaged hole cover for a bore hole cored from a paved surface that includes a cover plate configured to cover the bore hole and support vehicular traffic. An engagement mechanism is attached to the cover plate and extends down into the bore hole. The engagement mechanism is configured to be actuated by a user torque input that causes an engagement plate selectively shiftable relative to the cover plate to thereby shift an engagement member along a sloped wall and thus radially outwardly or inwardly, causing the engagement mechanism to selectively engage or disengage the wall of the bore hole. When the engagement member is in frictional contact with the hole, unintentional extraction of the engagement mechanism is prevented. The selectively frictionally engaged hole cover effectively provides a temporary cover for a bore hole in a road, parking lot, or other paved surface.

The utility model relates to a high-stability security lifting guide rail suitable for multiple scenes, which aims to solve the technical problems of larger friction force and larger loss caused by larger contact surface when the current lifting guide rail is connected with a corresponding moving mechanism, and comprises a track, a connecting plate and an L-shaped plate, the two rails are symmetrically connected through a cross beam; the connecting plate is arranged between the two rails; wherein guide wheels are arranged at the two ends of the connecting plate respectively, and the guide wheels are in rolling fit with the rails; the rear end of the top of the longitudinal section of the L-shaped plate is fixedly connected with the connecting plate; wherein the rear end of the longitudinal section of the L-shaped plate is provided with a hydraulic cylinder body, the hydraulic cylinder body is connected with a hydraulic press body, and the outer end of a piston rod of the hydraulic cylinder body is fixedly connected with the connecting plate. Therefore, the loss is reduced.

The utility model belongs to the technical field of chimneys, and particularly relates to a self-standing steel chimney damper which comprises symmetrically-arranged fixing rings, a winding shaft is rotationally connected between the fixing rings at the top end, the fixing rings at the lower portion are fixedly connected through a sliding rod, the two fixing rings are fixedly connected through a friction plate, and the friction plate is fixedly connected with the winding shaft. A shell is slidably connected to the outer surfaces of the friction plate and the sliding rod, a friction block is slidably connected into the shell and makes contact with the friction plate, a traction rope is fixedly installed at the top end of the friction block, the traction rope penetrates through the shell and extends to the outer side of the shell, and the end, away from the friction block, of the traction rope is wound and fixed to the outer surface of the winding shaft. According to the self-standing steel chimney damper, the pulling rope is arranged to pull the friction block and increase the pressure between the friction block and the friction plate, so that the friction force between the friction block and the friction plate can be increased, the damping force can be increased, and the damping can be changed through the arrangement.

The utility model relates to an aluminum disc flywheel ring assembly for a steel cord double-twisting machine, which comprises two aluminum discs and a flywheel ring, only one flywheel ring is arranged between the two aluminum discs; a mounting groove is formed at the mounting bulge on the aluminum disc, and the mounting groove is matched with the flywheel ring in size; the mounting groove is formed in the outer side of the mounting bulge of the aluminum disc; the two ends of the flywheel ring are embedded in the mounting grooves of the aluminum discs correspondingly, and the flywheel ring synchronously rotates at a high speed along with the two aluminum discs. A pressing plate is mounted on the mounting groove through a fastener, and is used for pressing and fixing the end part of the flywheel ring in the mounting groove of the aluminum disc; two thread guide holes are formed in the flywheel ring, and the core strand and the upper thread correspondingly penetrate through the two thread guide holes respectively; a balancing weight is arranged on the side, away from the flywheel ring, of the aluminum disc. The number of the flywheel rings between the aluminum discs is reduced to be one, so that parts which are in high-speed contact friction with air are reduced, air resistance is further reduced, and in the operation process of the steel cord double-twisting machine, the rotation driving power for driving the cradle device is lower, and more energy is saved.

The application relates to a friction build-up welding repair method for metal parts and relates to the technical field of welding repair of metal materials. The main technical scheme is that in the process of adopting a raw material rod to perform friction build-up welding treatment on a metal part, a set type of cooling medium is applied to the raw material rod and the metal part in a set mode, heat generated in the friction build-up welding process is timely conducted, excessive softening and deformation of the raw material rod are inhibited, and the top forging pressure and the friction force of the raw material rod acting on the surface of the metal part are improved. The application is mainly used for improving the stability of the contact friction force and the top forging pressure of the raw material rod and the surface of the metal part in the friction build-up welding process, thereby promoting metallurgical combination of a build-up welding layer and a metal part interface, and thereby solving the problems of poor interface combination, poor surface forming quality, high repair cost and low material utilization rate of the existing friction build-up welding repair.

The utility model relates to a kind of coating device with antiskid conveying structure, core improvement is to replace the first over roller of traditional metal over roller of winding guide roller group with plastic material and the first over roller of surface being equipped with antiskid structure, to solve traditional technical defects.Plastic material friction coefficient is higher than metal, can naturally promote and the contact friction of flexible copper-clad plate substrate, surface antiskid structure is matched, can further increase effective contact area, make friction force multiple level promotion, ensure that flexible copper-clad plate substrate is stably and uniformly conveyed to winding mechanism.Meanwhile, plastic thermal conductivity is far lower than metal, surface temperature is little by environmental temperature and humidity fluctuation, not easy to reduce to dew point temperature below, reduce the condensation of over roller surface water vapor from the source, greatly reduce the probability of dewing, both eliminate the negative influence of water droplet on friction coefficient, consolidate antiskid effect, prevent flexible copper-clad plate substrate from being damp and deforming, improve the reliability and service life of final product.

The utility model relates to a multistage liquid centrifugal pump, in particular to a multistage liquid centrifugal pump with eccentric deflection of a middle-section rotor. A pump cover (2) in front of the pump is fixedly connected with a barrel (1); the first-stage middle section (4) and the cylinder body (1) are positioned by adopting a spigot; the radial positioning seam allowances of the first-stage middle section (4) and the second-stage middle section (5) are eccentric, the radial positioning seam allowances of the second-stage middle section (5), the third-stage middle section (6) and the fourth-stage middle section (7) are concentric, the radial positioning seam allowances of the fourth-stage middle section (7) and the fifth-stage middle section (8) are eccentric, the radial positioning seam allowances of the fifth-stage middle section (8) and the sixth-stage middle section (9) are eccentric, and the radial positioning seam allowances of the sixth-stage middle section (9) and the barrel body (1) are concentric; and the cylinder body (1) is fixedly connected with the rear pump cover (3). According to the utility model, contact friction and shaft sticking between the rotor and static parts during starting, shutdown and operation, especially during low-rotating-speed turning are avoided. The service life of parts is prolonged, gaps between dynamic / static parts are minimized, and the efficiency of the pump is improved.

The utility model discloses a cross-shaped self-tapping screw with an anti-skidding tooth structure, which comprises a screw cap, a screw body is arranged on the bottom wall of the screw cap, the screw body and the screw cap are integrally formed, anti-skidding tooth threads are arranged on the screw body, a cross-shaped groove is arranged on the top wall of the screw cap, a locking mechanism is arranged on the screw cap, and the anti-skidding tooth threads are arranged in the cross-shaped groove. The locking mechanism comprises a locking gasket, the locking gasket is arranged on the screw body in a sleeving mode through a formed through hole, a plurality of pointed cones are fixedly welded to the side wall, away from the nut, of the locking gasket, a fixing ring is arranged on the side, away from the nut, of the locking gasket, and the fixing ring is fixedly welded to the screw body. According to the self-tapping screw, the contact friction force between the locking gasket arranged on the self-tapping screw and a connecting piece can be improved through the multiple pointed cones, the locking gasket cannot rotate, then the nut cannot rotate reversely, and the problem that the self-tapping screw is prone to reversely rotating out of a workpiece due to shaking generated by the outside world, and consequently looseness is caused is solved.

The invention discloses a shielding layer scattering method and device based on wire harness composite motion. The scattering method comprises the following steps that S1, the end of a wire harness is fixed; s2, a rotating tool with flexible brush wires is driven to approach the to-be-processed section of the shielding layer, and the rotating tool continuously rotates; s3, when the rotating tool rotates, the wire harness is controlled to execute compound motion, and the compound motion is one of or a combination of the following two modes: a, periodic up-down swinging is performed in the direction perpendicular to the length direction; b, enabling the wire harness to periodically rotate around the axis of the wire harness; s4, in the process of executing the steps S2 and S3, one of the following progressive motions is synchronously controlled: a, the wire harness gradually moves towards a rotating tool with flexible brush wires in the length direction of the wire harness; b, the rotating tool gradually moves towards the shielding layer of the wire harness; and S5, continuous contact and friction between the flexible brush wires and the wire harness shielding layer executing the composite motion are carried out, and shielding layer metal wires are carded and scattered. The shielding layer scattering device is used for executing the method.

The invention discloses a novel roller type conveying device of a drawing machine, and relates to the technical field of copper material conveying equipment. Comprising a conveying table, a motor is arranged on one side of the conveying table, a plurality of sets of conveying rollers are arranged on the inner side of the conveying table, the output end of the motor is fixedly connected with one ends of the conveying rollers, a notch is formed in one side of the conveying table, and a guide groove is formed between every two adjacent sets of conveying rollers. And one end of the guide groove extends to the notch. According to the novel roller type conveying device of the drawing machine, the high-temperature felt conveying belt is matched with the rubber sleeves on the outer sides of the belt rollers, the contact friction force between the high-temperature felt conveying belt and the copper bars is increased, scratches are avoided in the conveying process, the conveying belt and the belt rollers are driven by the gravity of the copper bars to rotate, extra power is not needed, and damage to the surfaces of the copper bars caused by hard contact is reduced.

The utility model relates to the technical field of side protection of belt conveyors, and provides an integrated belt conveyor with a side protection function, which is characterized in that a driving mechanism is arranged below a conveying belt mechanism, and a first fluted disc and a second fluted disc can be driven to rotate in a meshed manner through a forward and reverse motor; two groups of driven fluted discs which are respectively engaged with the two sides of the first fluted disc and the second fluted disc can be synchronously engaged and rotate oppositely, and at the moment, limiting plates at the tops of the two groups of driven fluted discs can rotate by taking a rotating rod as an axis until rolling assemblies which are arranged at equal intervals on the side surfaces of the limiting plates are positioned above a conveying belt mechanism; according to the design, synchronous inward rotation work of the two sets of limiting plates can be rapidly completed, then limiting protection is conducted on object conveying, contact friction between the objects and the limiting plates can be reduced through the rolling assemblies arranged on the side faces of the limiting plates at equal intervals when the objects make contact with the limiting plates, and then the problem that the objects are abraded in the conveying process is effectively solved.

The utility model discloses a cabinet door opening and closing limiting mechanism which comprises a fixing plate, a first connecting plate perpendicular to the fixing plate is integrally arranged at one end of the fixing plate, and a second connecting plate parallel to the fixing plate is integrally arranged at the end, away from the fixing plate, of the first connecting plate. A limiting plate perpendicular to the fixing plate is integrally arranged at the end, away from the first connecting plate, of the second connecting plate, and the beneficial effects are that through a limiting mechanism composed of the fixing plate, the first connecting plate, the second connecting plate, the limiting plate, the limiting groove and the notch, when the cabinet door is opened and closed, the part, rotating in the limiting groove, of the inner frame on the cabinet door can be limited; the rotating angle is not larger than 90 degrees, abrasion and paint peeling caused by contact friction between the outer side of the cabinet door and the edge of the door frame in the rotating opening and closing process are avoided, damage caused by collision between the cabinet door close to the wall and the wall face is also avoided, the appearance attractiveness of the cabinet door is protected, and the service life of the cabinet door is prolonged.

The utility model relates to the technical field of bearings, in particular to a noise reduction type sliding bearing for a wind turbine generator, which comprises a first bearing seat and a second bearing seat, connecting supports are arranged on the inner side of the first bearing seat and the inner side of the second bearing seat, and an upper bearing bush and a lower bearing bush are fixedly connected to the inner surfaces of the two connecting supports respectively. The arc-shaped cavities in the first bearing seat and the second bearing seat are matched with the communicating mechanism composed of the first communicating pipe and the second communicating pipe, the first oil cavity is communicated with the second oil cavity, the first oil cavity is communicated with the second oil cavity through the communicating mechanism composed of the first communicating pipe and the second communicating pipe, and the oil cavity is communicated with the second oil cavity through the connecting support. The first oil cavity and the second oil cavity are prevented from being provided with openings and directly butted and communicated through the openings to cause oil leakage at the joint, and the situation that the service life of the bearing is affected by aggravation of friction due to direct contact friction of the metal surface caused by rapid loss of lubricating oil can be prevented.

The utility model relates to the technical field of multi-core electric energy meters, in particular to a multi-core electric energy meter harmonic test device, which comprises two box bodies, the two box bodies are rotatably connected through a hinge, the box bodies are provided with cavities for storing devices, the box bodies are provided with a plurality of first rollers, the box bodies are provided with a plurality of second rollers, and the first rollers and the second rollers are arranged on the box bodies. A second protection thin plate used for protecting the device is arranged in the box body, a clamping groove is formed in the box body, a buckle body is fixedly installed on the box body, and the buckle body is matched with the clamping groove. Through the arrangement of the first roller and the second roller, a worker can additionally select one transportation mode when transporting the box body, so that the transportation efficiency of the box body is improved, the phenomenon that the hinge is in contact friction with the ground is reduced, the service life of the hinge is prolonged, and the cost is reduced. And meanwhile, the first rolling wheels and the second rolling wheels can effectively improve the transportation efficiency of workers.

A sleeved type anti-eccentric-wear oil pipe pup joint assembly comprises an oil pipe pup joint outer sleeve, and annular clamping grooves are symmetrically formed in the positions, close to the two ends, of an inner hole of the oil pipe pup joint outer sleeve. Positioning sleeves are inserted into the two ends in the oil pipe pup joint outer sleeve respectively, an inner hole of each positioning sleeve is in a step shape, a plurality of open grooves are evenly distributed in the circumference of the small hole end of each positioning sleeve, and an annular boss is arranged at the end, close to the small hole, of the outer edge of each positioning sleeve and clamped in the corresponding annular clamping groove. End bushings are respectively inserted into the inner holes of the positioning sleeves at the ends of the large holes, and the inner ends of the end bushings are provided with conical openings and are tightly attached to the shoulders of the inner holes of the positioning sleeves; a middle lining is embedded between the two positioning sleeves in the oil pipe pup joint outer sleeve, the two ends of the middle lining are tightly attached to the end linings, the inner diameters of the two ends of the middle lining and the end linings are consistent, and the middle lining and the end linings are made of abrasion-resistant, oil-resistant and temperature-resistant materials and used for avoiding contact friction between the sucker rod and an oil pipe. The device has the beneficial effects that direct eccentric wear between the sucker rod and the oil pipe can be prevented, and oil leakage caused by wear of the oil pipe and rod breakage caused by fine grinding of the sucker rod are avoided.

The utility model relates to the technical field of tunnel construction, in particular to an anti-slip device of a tunnel frequency conversion locomotive, which comprises a frame, a track and a brake cylinder, the surface of the frame is fixedly connected with a mounting plate, an output shaft of the brake cylinder is fixedly connected with a four-claw connecting piece, and the surface of the four-claw connecting piece is movably connected with a secondary connecting piece. Through the connection of the output shaft of the brake cylinder and the four-claw connecting piece, under the connection of the first brake rocker and the first pull rod and the connection of the second brake rocker and the second pull rod, the action angles of the first brake rocker and the second brake rocker are changed by changing the length of the output shaft of the brake cylinder; under the connection of the first brake shoe and the first brake rocker and the connection of the second brake rocker and the second brake shoe, the contact friction force is increased through the abutting contact of the first brake shoe and the second brake shoe with the track, the anti-slip effect on the locomotive is achieved, and the use safety performance of the locomotive is improved.