1105 results about "Kinetic friction" patented technology

The invention relates to the technical field of steel box girder welding, and particularly discloses a steel box girder welding device and method.The steel box girder welding device comprises a platform, a movable frame body and a welding mechanism, the movable frame body is provided with a bearing frame, and the bearing frame is provided with a rolling assembly and a first driving assembly for driving the rolling assembly to abut against the top face of a U-shaped rib of a steel box girder; the bearing frame is provided with two symmetrically-distributed clamping assemblies and a second driving assembly for driving the clamping assemblies to abut against the two side faces of the U-shaped rib, each clamping assembly comprises a mounting frame and a clamping plate connected to the mounting frame, a crawler belt is arranged on the periphery of each clamping plate, and the mounting frame is provided with a third driving assembly for driving the crawler belt to rotate; the third driving assembly drives the crawler belt to rotate to be matched with the moving speed of the moving frame body, so that sliding friction does not occur between the crawler belt and the U-shaped rib. According to the steel box girder welding device and the welding method, the abrasion of the U-shaped rib caused by sliding friction is avoided, and the stability of the moving process of the movable frame body and the continuous proceeding of the welding operation are ensured.

A method of additive manufacturing a part having integrated passages is provided. In one aspect, the method includes forming a part having a near net shape by moving a friction stir tool to deposit a filler material in a predetermined formation. The tool can include a rotating spindle having a channel configured to hold the filler material. The method can include machining the near net shape part to form a plurality of grooves extending into a surface of the part, the plurality of grooves sized and shaped to each receive a tube. The method can include placing a tube into each of the plurality of grooves and moving the tool across the surface of the part and depositing additional material configured to secure the tubes within the plurality of grooves. The method can include machining the additional material deposited over the tubes to a predetermined shape.

A method of additive manufacturing a part having integrated passages is provided. In one aspect, the method includes forming a part having a near net shape by moving a friction stir tool to deposit a filler material in a predetermined formation. The tool can include a rotating spindle having a channel configured to hold the filler material. The method can include machining the near net shape part to form a plurality of grooves extending into a surface of the part, the plurality of grooves sized and shaped to each receive a tube. The method can include placing a tube into each of the plurality of grooves and moving the tool across the surface of the part and depositing additional material configured to secure the tubes within the plurality of grooves. The method can include machining the additional material deposited over the tubes to a predetermined shape.

The invention provides a laser cutting jig and laser cutting equipment, and belongs to the technical field of laser cutting. The laser cutting jig comprises a cutting table and supporting legs, a sliding rail is fixedly installed at the top of the cutting table, a moving table is installed on the surface of the sliding rail, a limiting mechanism is arranged at the top of the cutting table, and the limiting mechanism comprises a rotating disc, a sliding groove, a rolling wheel and a first hydraulic rod. By arranging the limiting mechanism, a user places a workpiece to be cut on four limiting seats and enables the workpiece to be located above rolling wheels, sliding friction between the workpiece and the limiting seats is converted into rolling friction through the arrangement of the rolling wheels, friction force is reduced, and after the limiting seats reach preset positions, the workpiece is cut by starting a first hydraulic rod; and the limiting plates are driven to move, the limiting plates are finely adjusted, so that the workpiece is clamped by the four limiting plates, and compared with the prior art, the clamping effect is more stable.

The invention relates to the technical field of friction coefficient measuring devices, and discloses a device for testing the friction coefficient of an anti-skid coating of a cultivation work ship deck. Comprising a testing platform, a friction coefficient testing mechanism arranged below the testing platform, a driving mechanism arranged on the testing platform and used for driving the friction coefficient testing mechanism to horizontally move, and a partition assembly and a water spraying assembly arranged in the middle of the lower surface of the testing platform; through the arrangement of the high-pressure nozzles, in the moving process of the testing platform, high-pressure gas can automatically clean a deck testing area through the high-pressure nozzles, dust attached to the surface of a deck is effectively removed, manual pre-cleaning is not needed, the testing efficiency is remarkably improved, meanwhile, seawater is sprayed to the designated testing area through the water spraying assembly, and the testing efficiency is improved. The environment of the residual seawater on the deck in the actual operation of the cultivation work ship is accurately simulated, and the technical problems that an existing portable sliding friction instrument needs to be manually cleaned and cannot simulate the residual seawater environment are solved.

The utility model provides a friction testing machine, belongs to the technical field of titanium alloy ball testing equipment, and particularly relates to a friction testing machine for titanium alloy ball cladding, which comprises a base, and a supporting structure is connected above the base through a fixed gear. One side of the supporting structure is connected with a movable gear through a transmission gear corresponding to the fixed gear, a friction roller is connected above the movable gear, and through the movable gear with the friction roller arranged on the base, when different friction rollers are replaced, the friction roller drives the movable gear to adaptively abut against a to-be-tested ball, and therefore the ball can be tested. Linkage with the fixed gear is achieved through transmission of the transmission gear, the fixed gear drives the to-be-tested ball to rotate together through the supporting structure, transmission is transmitted to the movable gear to drive the friction roller to rotate, and the real use friction condition is simulated.

The invention discloses a friction-driven precise pipettor and a use method thereof. The friction-driven precise pipettor comprises a fixed frame, a pipette and a driving mechanism arranged in the fixed frame, the driving mechanism comprises a disc motor, the disc motor is fixedly connected to the outer wall of one side of the fixing frame, a driving shaft is rotationally connected to the inner wall of one side of the fixing frame, one end of an output shaft of the disc motor penetrates through the fixing frame and is fixedly connected with the driving shaft, and a driving friction wheel is movably connected to the circumferential outer wall of the output shaft of the disc motor; the circumferential outer wall of the output shaft of the disc motor is in threaded connection with a locking nut; a friction wheel frame is slidably connected between the inner walls of the two sides of the fixing frame, and a driven friction wheel is rotationally connected between the inner walls of the two sides of the friction wheel frame. Through the arrangement of a controller, a pressure sensor, a displacement sensor, an actuator and a liquid level sensor, it is ensured that key parameters are controlled in the pipetting process; the compression degree of the compression spring is adjusted in a self-adaptive mode, the radial pre-tightening force is changed, and the stability of the pipettor in long-term operation is achieved.

The utility model discloses a recoverable swing column for shock resistance, relates to the technical field of shock resistance of constructional engineering, and adopts the technical scheme that the recoverable swing column comprises a stand column, two energy consumption dampers and a rotatable column foot, each energy consumption damper comprises a clamping plate, a bottom connecting piece, a top connecting piece, an SMA energy consumption metal rod, a friction plate and a fastener, the energy dissipation damper is connected with the stand column through the top connecting piece, one end of the clamping plate is connected with the top connecting piece through a fastener, the other end of the clamping plate is connected with the bottom connecting piece through a fastener, and the number of the friction plates is two. Rotation constraint of a connecting interface of the main body structure and the foundation slab is relaxed through the energy dissipation dampers and the rotatable column feet, so that the structure rotates and rubs in a limited mode to dissipate earthquake energy, the energy dissipation dampers generate up-down sliding friction to dissipate the earthquake energy, and damage and residual deformation of the main body structure are reduced.

The invention relates to the technical field related to conveying belts, in particular to a material conveying structure for a conveying belt detection machine table, which comprises a baffle plate, and a material blocking mechanism is arranged on the upper surface of the baffle plate. According to the material conveying structure for the conveying belt detection machine table, through the arrangement of the material blocking mechanism, when the material conveying structure is used, a rotating cylinder in the material blocking mechanism can rotate when making contact with materials, sliding friction between the materials and a check block is converted into rolling friction, the influence of friction force on the materials is greatly reduced, and the integrity of the materials is effectively protected; the speed of materials moving towards the material receiving box can be increased through rotation of the rotating cylinder, the materials are prevented from being detained and accumulated at the blocking position, the materials can quickly and smoothly pass through the material blocking area, continuity and smoothness of the whole material conveying process are guaranteed, the position of the material blocking mechanism can be flexibly adjusted according to the height of the materials, unqualified objects are accurately blocked, and production efficiency is improved. And the material detection accuracy and the separation efficiency are effectively improved.

The utility model discloses a display pitching adjusting assembly, including swivel seat, panel subassembly and adjusting structure, adjusting structure includes locating piece, clamping piece and friction piece, locating piece has outer wall and inner wall, and the outer wall and inner wall enclose and is provided with the accommodation space, friction piece is clamped in the accommodation space, and the friction piece is clamped in the accommodation space. The inner wall is provided with an inner wall outer surface and an inner wall inner surface opposite to the inner wall outer surface, the clamping piece is clamped in the positioning piece and makes contact with the inner wall inner surface in an abutting mode, so that the inner wall outer surface makes friction contact with the friction piece, and the displayer pitching adjusting assembly has a look-up state and a look-down state. The swivel base and the panel assembly are rotationally connected around a first axis so as to be switched between a look-up state and a look-down state, when the swivel base and the panel assembly are switched to the look-up state, the positioning piece, the friction piece, the clamping piece and the panel assembly rotate in the same direction, and when the swivel base and the panel assembly are switched to the look-down state, the positioning piece, the clamping piece and the panel assembly rotate in the same direction; and a one-way mechanism for limiting the friction piece to rotate relative to the rotating head seat is arranged between the friction piece and the rotating head seat.

The invention discloses a method and device for testing the sliding friction coefficient of rock under the true triaxial stress condition, and belongs to the field of rock parameter tests.The method comprises the steps that a rock cube to be tested is cut into two parts along the diagonal line, and rock powder of the same texture is smeared on the diagonal planes of the two cut rocks; the two parts of rocks coated with the rock powder are attached together along the diagonal planes of the rocks, and confining pressure is applied to the two opposite directions of the attached to-be-measured rock cube respectively till the confining pressure reaches the corresponding preset value; applying an axial pressure to the attached to-be-tested rock cube at a constant loading speed until the change of the axial pressure tends to zero; and calculating the sliding friction coefficient of the rock cube to be measured according to the final stable value of the axial pressure. The method can test and simulate the rock friction coefficient of a real stratum under the three-dimensional ground stress condition, and the accuracy of a test result is improved.

The utility model discloses a ball mill lining plate for preparing superfine powder, which comprises a lining plate bottom plate, the top surface of the lining plate bottom plate is a grinding working surface, the lining plate bottom plate is provided with at least two grinding working surfaces, each grinding working surface is an involute arc-shaped curved surface, each grinding working surface is provided with a grinding medium lifting flow guide strip, and the grinding medium lifting flow guide strips are arranged on the lining plate bottom plate. Reinforcing ribs are embedded in the lining plate bottom plate, and positioning through grooves and positioning strips are arranged on the two side faces, arranged in the axial direction of the ball mill, of the lining plate bottom plate correspondingly. Materials on the grinding working face make full contact with grinding media, grinding is carried out by making full use of sliding friction between the grinding media and the grinding working face, the grinding media lift the flow guide strips to promote self-circulation of the grinding media and the materials, the contact face with the grinding media is changed into line contact from point contact, the grinding area is increased, and the grinding efficiency is improved. And a positioning strip, a positioning through groove, a positioning pin and a positioning circular groove are arranged, so that the lining plate bottom can be quickly and accurately positioned and spliced.

The invention relates to the field of low-temperature liquid conveying equipment, and discloses a rotor supporting system of a low-temperature liquid pump, which is arranged on a pump rotating shaft and is used for supporting a rotor. The system includes a fixed bearing bushing, a swivel bearing bushing, and a flexible coupling bushing ring. The fixed bearing bushing is fixedly mounted in a bearing supporting seat of the pump body; the rotating bearing bush is arranged on the pump rotating shaft in a sleeving mode, and a sliding friction pair is formed between the rotating bearing bush and the fixed bearing bush. And the flexible connecting bushing ring is arranged between the rotary bearing bushing and the pump rotating shaft and is in interference fit with the rotary bearing bushing and the pump rotating shaft respectively. Through the flexible connection bushing ring, the thermal deformation difference of materials in a low-temperature environment can be absorbed, starting impact and operation friction damage are reduced, and therefore stable supporting and long-term reliable operation of the low-temperature liquid pump rotor are achieved.

The present invention relates to the technical field of automatic polishing of target side edges, and in particular, to an automatic polishing device for target side edges and a method for using the device. The device comprises a processing support base, a rotating movable guide assembly is provided on the surface of the processing support base, the rotating movable guide assembly is used to set a lateral placement point for target polishing, and an anti-deviating block is installed at the lateral placement point, thereby limiting the friction between the lateral placement point and the target; a movable side polishing processing assembly is provided on the surface of the rotating movable guide assembly, and the movable side polishing processing assembly is used to polish the side of the target; when the connecting frame rotates, the friction block is driven to move along the side of the target, and the debris on the side of the target is cleaned during the movement of the friction block, thereby improving the polishing quality of the polisher, and the pressing plate and the friction block are respectively located at the four corners of the side of the target, and the lateral movement of the target is limited, thereby offsetting the driving force generated during the polisher processing, so that the target is continuously in a stable state.

The invention relates to the field of steel cutting equipment, in particular to die steel fixed-length cutting equipment which comprises a base, supporting pieces are fixedly installed on the front side of the base in a bilateral symmetry mode, a cutting saw is arranged on the upper side of the front portion of the supporting piece on the left side in a left-right sliding mode through an electric sliding block, and a pushing mechanism for pushing die steel materials in a fixed-length mode is arranged in the middle of the base. The positioning mechanism is in contact with the die steel material in a rolling contact mode, rolling contact points are evenly distributed in the upper direction, the lower direction, the left direction and the right direction of the die steel material, and therefore sliding friction between the positioning mechanism and the die steel material is prevented; and the cutting effect and the cutting precision of the die steel materials are guaranteed, the pushing plate is controlled to be not in contact with the die steel materials during reset movement through the control assembly, and the cutting effect and the cutting precision are further guaranteed.

The utility model relates to the technical field of chain plate conveying, and discloses a low-friction horizontal bending wheel which is characterized in that connecting blocks are fixedly connected to the ends, away from a fixing shaft, of a first connecting frame and a second connecting frame, and clamping grooves are formed in one ends of the connecting blocks; two bearings are fixedly connected to the positions, located on the two sides of the first connecting frame and the second connecting frame, of the outer side of the fixing shaft in a sleeving mode, discs are fixedly connected to the outer sides of the two bearings in a sleeving mode, arc-shaped sectional materials are arranged on the outer sides of the two connecting blocks, and inserting grooves are formed in the inner sides of the arc-shaped sectional materials; the bottom of the chain plate is mounted in the limiting groove and below the disc, the chain plate moves at the top of the arc-shaped profile, the chain plate drives the disc to rotate on the outer side of the fixing shaft, sliding friction between the chain plate and the disc is changed into rolling friction, friction force is reduced, and the service life of the chain plate is prolonged. Therefore, the service life of the chain plate is prolonged, the designable length of the conveying line is increased, and more space is saved.

The invention relates to the technical field of stress detection equipment, and discloses building steel structural member stress detection equipment which comprises a base, an adjusting ring is fixedly arranged on the base, and a first detection piece for detecting stress at the two ends of a steel structural member is arranged on the adjusting ring; the adjusting ring is provided with a second inspection part for detecting the stress of the middle section of the steel structural part, and the adjusting ring is provided with a pushing part for enabling the steel structural part to move; the J-shaped connecting groove is matched with the pulley, non-impact conversion from horizontal movement to vertical movement is achieved, jumping generated during lifting of the placing piece is avoided, the size design of the avoiding groove provides an independent movement space for the first sensor, the movement interference risk is thoroughly eliminated, sliding friction is converted into rolling friction through bearing matching of the pulley and the rotating shaft, and the stability of the sensor is improved. And through the symmetrical layout of the connecting grooves, the stress on the two sides of the placing piece is balanced, side inclination during lifting is avoided, and it is ensured that the posture of the steel structural piece is stable.

The invention discloses paired disc type friction equipment for cloth fiber recovery processing, and particularly relates to the field of mechanical equipment, the paired disc type friction equipment comprises a bearing box table, and a friction mechanism, a spiral conveying mechanism for feeding and a finished material extraction assembly are arranged at the top of the bearing box table. The friction mechanism is driven by the transmission motor to work, the friction mechanism shears and crushes materials, the materials are heated and softened after being cut, and the materials are discharged out of the friction assembly through the discharging groove from the position of the inclined variable slope table at the edge of the concave table disc along with the centrifugal force of high-speed rotation of the movable convex disc under the self weight of the materials. The granular materials are assisted to be discharged from the position of the friction assembly part, so that the condition that viscous materials are retained on the surfaces of the movable convex disc and the fixed concave disc and cannot be discharged smoothly is effectively avoided, and then the granular materials gathered in the processing cavity are discharged out of the friction mechanism through the discharging hopper along with negative-pressure airflow; and the situation that the softened materials cannot be smoothly discharged due to the viscous force of the materials is avoided.

The invention relates to the technical field of road and bridge construction, and particularly discloses road and bridge construction steel bar connecting equipment convenient to position, collecting parts are fixedly connected to the two sides of the middle of a main body, and a welding part is fixedly connected to the side, away from the collecting parts, of the middle of the main body. According to the road and bridge construction reinforcing steel bar connecting equipment convenient to position, the rotating wheels are arranged on the inner side of the feeding cylinder in a surrounding mode, and after reinforcing steel bars enter the feeding cylinder, the rotating wheels make multi-point contact with the surfaces of the reinforcing steel bars. The rotating wheels are uniformly distributed, not only convert sliding friction into rolling friction, but also play a role in auxiliary positioning. Due to the fact that the positions of the rotating wheels are relatively fixed, the reinforcing steel bars are jointly supported and guided by the rotating wheels in the moving process, and the position deviation of the reinforcing steel bars in the feeding cylinder is further limited. When the reinforcing steel bar moves forwards, if tiny radial deviation occurs, the rotating wheel can push the reinforcing steel bar back to the position relative to the center through contact force, and the reinforcing steel bar is always kept to move forwards stably in the axis direction of the feeding cylinder.

The invention provides a friction and wear performance testing system and method for a sealing ring. The frictional wear performance test system comprises: an accommodating device, which comprises a first accommodating groove for placing a sealing ring sample; the friction device is rotatably arranged relative to the accommodating device and comprises a sample surface opposite to the notch of the first accommodating groove; the driving device is in driving connection with the friction device and is configured to drive the friction device to rotate relative to the accommodating device; the loading device is in driving connection with the accommodating device and is configured to enable the sealing ring sample in the first accommodating groove to be in contact with the surface of the sample through the accommodating device and enable a preset test force to be formed between the sealing ring sample and the sample; the friction force measuring device is configured to obtain friction force information representing friction force between the surface of the sample and the sealing ring sample; and the data processing device is coupled with the friction force measuring device and is configured to receive the friction force information and obtain a friction performance parameter value of the sealing ring sample according to the friction force information.

The invention discloses wear resistance detection equipment for carpet production and a detection method, and particularly relates to the field of carpet detection.The detection equipment comprises a machine body, a supporting seat is fixedly arranged in the machine body, the supporting seat is used for placing a carpet to be detected, and a fixing mechanism is further arranged in the machine body and used for fixing the carpet to be detected on the supporting seat; a grinding detection mechanism is arranged in the machine body, the grinding detection mechanism comprises a friction head capable of performing vertical linear motion and transverse reciprocating motion, and the grinding detection mechanism performs wear resistance detection by driving the friction head to perform transverse reciprocating motion on the upper surface of the carpet to be detected. The multi-point supporting assembly is arranged to disperse pressure, limit tensile strain, reduce vertical compression and provide additional support for the carpet to be detected, deformation of a surface layer material of the carpet to be detected when the surface layer material moves along with the friction head can be effectively reduced, and therefore the actual movement distance of the friction head can be closer to the theoretical movement distance; and the wear resistance detection precision is improved.

The invention discloses a detachable soft gasket and method for thin plate grinding deformation control. The soft gasket structurally comprises a friction adsorption enhancement layer, a micropore vibration reduction layer and an elastic supporting layer which are detachably connected in sequence from top to bottom. In the soft gasket, the elastic supporting layer provides flexible buffering, the micropore vibration reduction layer absorbs machining vibration through a closed-cell micropore structure, the friction adsorption enhancement layer enhances the adsorption force and stability through non-uniform waveform raised grains and conical grooves, the bottom of the friction adsorption enhancement layer is designed in a sealed mode, grinding fluid permeation is effectively prevented, and all the layers cooperate with one another to improve the machining precision. The soft gasket is designed to be of a multi-layer structure, machining deformation is effectively reduced by providing a positioning reference, and the problems of initial deformation, end face jumping and planeness out-of-tolerance of the thin plate caused by a traditional rigid fixing or adsorption mode can be remarkably solved.

The invention relates to the technical field of winding and conveying systems, in particular to a prepreg tape large-tension winding and conveying system which comprises a prepreg tape yarn releasing creel and a tension control device, multiple sets of tension control boxes are installed at the upper end of a tension control rack at equal intervals, and tension control swing rods are installed below the front ends of the tension control boxes; a cantilever control box and an encoder guide roller are installed at the left end and the right end of the tension control rack correspondingly, and an electrical cabinet is installed on the right side of the inner wall of the tension control rack. The prepreg tape large-tension winding and conveying system comprises four groups of air swelling shafts, 1-4 spindles of prepreg tapes can be selectively placed according to requirements, the rack structure is stable and firm, high-speed rotation of the air swelling shafts can be ensured, the tension of the prepreg tapes is always kept constant, and the prepreg tapes are free of sliding friction fuzzing, so that guarantee is provided for continuous and stable winding production of large-tension gas cylinders, and the production efficiency is improved. And a more efficient, more environment-friendly and higher-quality composite material manufacturing process is realized.

The invention relates to a sawing and milling machining unit, a machining center and a working method suitable for curtain wall profiles, a milling machining mechanism is used for achieving sawing machining or milling machining, a sawing and milling clamp is used for clamping and fixing the profiles in the vertical direction and the horizontal direction, and a pressing block of the sawing and milling clamp is driven by an air cylinder to clamp the profiles in the vertical direction and the horizontal direction. The vertical pressing mechanism moves towards the fixed roller in the vertical direction to vertically press the profile to be machined; the cross section of each fixed roller is semicircular, a plurality of groups of air holes which are arranged in parallel are formed in the semicircular area, the connecting line of the plurality of groups of air holes is positioned on one side of the axis of the fixed roller, and the connecting line of the air holes in two adjacent groups of fixed rollers forms an angle alpha of 100-120 degrees in the cross section direction of the fixed roller. In the section feeding and processing period, air is sprayed out through the fixed roller, an air cushion is formed on the bottom face of the section, the pressure of the dead weight of the section on the surface of the fixed roller is reduced, meanwhile, aluminum skimmings on the bottom face of the section are blown away, and the scratch problem caused by sliding friction between the section and the fixed roller is solved.

The invention discloses a winding and friction combined type depth self-adaptive lifting system for an ultra-deep well. The winding and friction combined type depth self-adaptive lifting system comprises an active driving device, a passive friction device, a guiding device and a winding rope storage device which are sequentially arranged. A steel wire rope is led out of the winding rope storage device, enters the active driving device through the guiding device, is wound between the active driving device and the passive friction device for multiple times and then is wound out of the active driving device, and the wound-out steel wire rope is connected with a lifting container. The active driving device is used for providing traction for the steel wire rope; the passive friction device is used for providing friction of the steel wire rope; the guiding device is used for steel wire rope turning. The winding rope storage device is used for winding and unwinding steel wire ropes. By adopting the compound winding friction that the steel wire rope is wound between the driving friction winding drum and the driven friction winding drum in a reciprocating mode, the friction of the steel wire rope can be effectively improved, meanwhile, the tension of the steel wire rope at the winding winding drum can be effectively reduced, and the interlayer pressure of the winding winding drum can be greatly reduced.

The utility model belongs to the technical field of metal plate forming experiments, and particularly relates to a metal plate forming testing machine which comprises a forming testing machine operation bottom table, a supporting frame is connected to the top of the forming testing machine operation bottom table in a welded mode, and a metal plate limiting assembly is installed on the side of the supporting frame. A metal plate pressing and bending assembly is installed on the inner wall of the supporting frame, a first supporting table is fixedly connected to one end of the forming testing machine operation bottom table, a first rotating shaft is fixedly connected to the top end of the first supporting table, and a rotating carrier roller is rotationally connected to the outer portion of the first rotating shaft; sliding friction force is converted into rolling friction force, the friction force between a metal plate and a bottom cushion block in the downward bending forming process of the metal plate is conveniently reduced, meanwhile, the metal plate limiting assembly is arranged, it is conveniently guaranteed that the middle position of the metal plate right faces the spherical punch in the experiment process, and the experiment efficiency is improved. And uniform stress during downward bending forming is facilitated.

The utility model discloses a double-layer drill rod structure of a drill rod, which relates to the technical field of drill rods and comprises a first drill rod, a female end connector is arranged at the top end of the first drill rod, a male end connector is arranged at the bottom end of the first drill rod, a distance adjusting mechanism is arranged in the first drill rod, and the distance adjusting mechanism is used for adjusting the unfolding distance of a second drill rod. A limiting mechanism is arranged on the outer side of the second drill rod, the friction force of the second drill rod is increased through internal parts of the first drill rod, and meanwhile the outer end of the second drill rod is prevented from directly shaking and rubbing with the inner end of the first drill rod. An operator can pull the limiting ring, adjust the position of the limiting ring and position and limit the outer side of the second drill rod, the overall length of the double-layer grouting drill rod can be freely adjusted according to needs, and therefore use flexibility is improved, friction force of the drill rod in the displacement process is increased through the sealing ring pad, and the service life of the drill rod is prolonged. And direct contact friction between the first drill rod and the second drill rod is avoided.

The invention relates to the technical field of robot welding guns, in particular to a robot welding gun neck capable of reducing wire feeding resistance. The robot welding gun neck comprises an outer pipe and an inner pipe, the inner pipe is a special-shaped pipe, a wire feeding channel extending in the axial direction of the inner pipe is arranged on the upper portion of the inner pipe, and a notch is formed in the bottom side of the wire feeding channel; a set of idler wheels are arranged in the wire feeding channel, and welding wires can penetrate through cavities between the idler wheels and the notches. The structural form of the inner pipe and the outer pipe is adopted, the special grooves are designed in the inner pipe to serve as wire feeding channels, the roller sets are placed in the grooves, sliding friction with large resistance in the wire feeding process is changed into rolling friction with low resistance through the roller sets, and therefore the wire feeding stability is improved.

The present application provides a friction material, a brake friction pad and a preparation method thereof, and a brake friction pair. The friction material includes the following components: 20% to 60% of a first damping material, 8% to 29% of a second damping material, 10% to 20% of an adhesive, 3% to 15% of spherical alumina, 3% to 20% of zirconium silicate, 3% to 10% of stannous sulfide, and 3% to 15% of chromite; wherein the first damping material includes a chrome steel alloy, a manganese copper alloy, and a cast iron alloy; and the second damping material includes vermiculite and porous graphite. The present application uses a first damping material with an excellent attenuation coefficient and an inorganic second material with a porous structure to prepare a friction material; the first damping material can convert external mechanical vibration energy into internal friction heat energy, thereby reducing vibration intensity; the porous structure of the second damping material can absorb and reduce the transmission of brake vibration energy, thereby reducing brake vibration and noise.

A cleaning apparatus, method, program product, medium and cleaning system, the cleaning apparatus including a cleaning member providing a forward force to the cleaning apparatus during forward movement of the cleaning apparatus and cleaning of a surface to be cleaned, and an assist member providing a forward force to the cleaning apparatus during forward movement of the cleaning apparatus and cleaning of the surface to be cleaned. And the power assisting piece provides backward speed reducing force for the cleaning equipment. In this way, in the process that the cleaning equipment moves forwards depending on the rolling friction force of the cleaning piece, the power assisting piece can be used for providing backward speed reducing force for the cleaning equipment to consume part of the rolling friction force, then the probability that a user is dragged forwards by the cleaning equipment in the process of using the cleaning equipment is reduced, user experience is improved, and user experience is improved. And meanwhile, the cleaning equipment is prevented from moving forwards too fast, and the use safety of a user is guaranteed.