213 results about "Friction drive" patented technology

The utility model discloses a transmission device for a vacuum coating machine, which belongs to the field of magnetron sputtering coating equipment, and comprises a transmission carrier plate, two parallel support plates arranged in a vacuum cavity, a plurality of parallel driven transmission shafts erected between the two support plates, a groove transmission wheel sleeved at one end of each driven transmission shaft, and a plurality of driven transmission shafts sleeved at the other end of each driven transmission shaft. The auxiliary transmission shafts are sequentially connected through chain transmission components, the auxiliary transmission shaft at one end is connected to the driving motor through the main transmission shaft, the transmission carrier plate is arranged on the groove transmission wheel and the plane transmission wheel, and a protruding strip is arranged at the bottom of one side of the transmission carrier plate and matched with a groove of the groove transmission wheel. Two-side friction transmission is adopted, one side is plane friction transmission, the other side is friction transmission through cooperation of the grooves and the protruding strips, the grooves can conduct linear transmission limiting during transmission of the transmission carrier plate, the plane friction transmission can adapt to thermal expansion and lengthening of the transmission carrier plate in the high-temperature environment, and the transmission clamping stagnation problem is prevented.

The utility model provides an automatic welding device for water conservancy and hydropower engineering pipelines, which comprises a bottom frame, two corresponding supporting frames are fixedly arranged on the bottom frame, a movable bracket is slidably arranged on the bottom frame, a fixed bracket is fixedly arranged at the top of one end of the bottom frame, and the fixed bracket is fixedly arranged on the top of the other end of the bottom frame. A hydraulic cylinder for driving the movable bracket to reciprocate is arranged at the other end of the underframe; a lifting adjusting mechanism is fixedly erected on the top of the supporting frame, a lifting plate is arranged at the bottom of the lifting adjusting mechanism, the lifting adjusting mechanism drives the lifting plate to move up and down, and a welding mechanism is arranged on the lifting plate. A friction driving mechanism for driving the pipeline above the fixed bracket and the movable bracket to rotate synchronously is arranged at the bottom of the lifting plate; the hydraulic engineering pipeline butt-joint device can achieve tight connection of the butt-joint position of two hydraulic engineering pipelines, meanwhile, the pipelines are convenient to rotate, annular welding of the outer portions of the pipelines is achieved, and welding efficiency is improved.

The invention relates to the technical field of detection devices, in particular to a shaft surface surfacing weld height real-time detection device. Comprising a base frame, a multi-shaft driving platform is installed on the base frame, a welding frame and an inspection frame are connected to the multi-shaft driving platform, the cooling spray pipe is fixed to the multi-shaft driving platform, a laser welding gun, an industrial camera and an infrared thermometer are fixedly installed on the welding frame, a pressing frame is connected to the inspection frame in a sliding mode, and a reciprocating pressure applying module is fixedly installed on the inspection frame. The reciprocating pressure applying module drives the pressing frame to vertically vibrate in a variable amplitude mode, a sliding frame is connected to the pressing frame in a sliding mode, and a friction transmission module for driving the sliding frame to horizontally vibrate in a variable amplitude mode is arranged between the pressing frame and the sliding frame. The integrated multi-shaft driving platform has the beneficial effects that the welding frame, the detection frame, the cooling spray pipe and other modules are integrated into the same movement system through the integrated multi-shaft driving platform, and the double-outlet-rod hydraulic cylinder and the linear transmission module are matched, so that welding, spray cooling, weld joint cleaning and height detection can be sequentially completed on the premise that a workpiece is not moved.

The invention relates to the technical field of measuring devices, in particular to a radar aluminum alloy radiator boundary dimension measuring device which comprises a measuring table arranged in a measuring area of the measuring device and used for placing a radiator to be measured, and a clamping assembly arranged in the measuring table and comprising a transmission mechanism, a lead screw and a linkage mechanism. The transmission mechanism and the linkage mechanism respectively drive a group of lead screws to rotate, nut seats which do linear motion according to rotation of the lead screws are arranged on the outer sides of the lead screws, a plurality of clamping plates with clamping fulcrums are arranged on the measuring table, the clamping mechanisms control the clamping plates to move towards a radiator through gears and the lead screws, and after the clamping plates reach, the clamping plates are driven by the transmission mechanism and the linkage mechanism to rotate. Resistance triggers the friction transmission mechanism between the lead screw and the gear to enable the clamping plates to stop moving, and the other clamping plates move to be attached to the special-shaped surface and stop moving accordingly, so that the clamping plates are adaptive to the special-shaped contour, the workpiece is prevented from being damaged by rigid extrusion, clamping stability is improved, and displacement is prevented.

The invention discloses a device and method for improving netlike grains on the roller surface of a cathode roller, and relates to the technical field of metal surface treatment, and the device comprises a roller arranged on the surface of a cathode roller main body; the gears are coaxially arranged on two sides of the roller and synchronously rotate along with the roller; the clamping insertion block is movably arranged above the gear; the special-shaped push block is fixed at the bottom end of the second oil cylinder; and the circular balls are arranged in the protective shell at equal intervals and roll and displace under the thrust of the special-shaped push block. The characteristic that the friction force can be changed before and after the cathode roller body is polished is ingeniously utilized, the idler wheels interacting through friction transmission are arranged on the surface of the cathode roller body in a contact mode, and the transmission effect of the idler wheels is dominated by the friction coefficient of the contact face; the rolling wheel does not rotate any more and drives the milligram energy actuator to be away from the cathode roller body, the cathode roller body is not polished any more, excessive polishing is prevented, and the risk that net-shaped lines are generated on the surface is reduced.

The invention discloses conveying equipment for electric iron tower angle steel production and machining, and relates to the technical field of steel structure production equipment. The device comprises a bottom plate, a mounting structure is fixedly connected to the middle of the upper end face of the bottom plate, a conveying structure is arranged in an inner cavity of the mounting structure, rotating structures are fixedly connected to the positions, located on the two sides of the mounting structure, of the upper end face of the bottom plate, and transmission structures are rotationally connected between the mounting structure and the front end faces of the rotating structures. During use, the conveying structure is installed and placed, then the first belt is supported through the supporting rollers when the conveying structure works, the second belt wheel is driven through the first belt wheel and the first belt during use through the rotating structure on the bottom plate, then the conveying frames on the two sides are driven by the belts to rotate synchronously, and a continuous and stable transmission chain is formed. And precise synchronous rotation is achieved through combination of the conveying rollers and the transmission toothed belt and gear meshing, the problem that slipping may occur in traditional friction transmission is solved, and the conveying device is particularly suitable for stable conveying of heavy angle steel.

This invention relates to the field of detection device technology, specifically a real-time detection device for the height of weld seams on shaft surfaces. It includes a base frame on which a multi-axis drive platform is mounted. A welding frame and a detection frame are connected to the multi-axis drive platform. A cooling spray pipe is also included and fixed to the multi-axis drive platform. A laser welding gun, an industrial camera, and an infrared thermometer are fixedly mounted on the welding frame. A pressure frame is slidably connected to the detection frame and a reciprocating pressure module is fixedly mounted thereon. The reciprocating pressure module drives the pressure frame to vibrate vertically with varying amplitude. A slide is slidably connected to the pressure frame, and a friction transmission module drives the slide to vibrate horizontally with varying amplitude between the pressure frame and the slide. The beneficial effects of this invention are: by integrating the welding frame, detection frame, and cooling spray pipe into a single motion system through an integrated multi-axis drive platform, and in conjunction with a double-rod hydraulic cylinder and a linear transmission module, welding, spray cooling, weld seam cleaning, and height detection can be completed sequentially without moving the workpiece.

The invention relates to the technical field of cable processing equipment, in particular to a composite cable processing device and a processing method thereof.The composite cable processing device comprises a device body, a mounting frame is arranged on the upper side of the device body, and a rotary outer gear ring and a driving gear used for driving the rotary outer gear ring are rotationally arranged on the front side of the mounting frame; a fifth synchronous wheel is mounted on the rear side of the mounting frame and is in transmission connection with the driving gear, an output shaft of the driving motor drives the fifth synchronous wheel to rotate in a friction transmission mode, and two transmission shafts and a transmission belt sleeving the two transmission shafts in a transmission mode are mounted on the portion, on the front side of the mounting frame, of the upper side of the device body in a front-back spaced mode; a plurality of electric clamping pieces used for clamping cables are installed on the surface of the transmission belt, and the transmission shaft is in transmission connection with the fifth synchronous wheel through a synchronous wheel assembly. The problem that when a cable is lapped by existing lapping equipment, lapping seam or lap joint is not uniform due to the fact that the cable slips in the traction process is solved.

The utility model discloses an X-axis multi-wheel friction transmission structure of an intelligent pharmacy. The X-axis multi-wheel friction transmission structure comprises a ground track and a multi-wheel bottom plate. The multi-wheel bottom plate comprises an upper surface and a lower surface, the multi-wheel bottom plate is connected with the ground track in a sliding mode, the ground track is arranged on the lower surface of the multi-wheel bottom plate, a lower synchronous belt wheel set is arranged on the upper surface, a lower synchronous rubber wheel set is arranged on the lower surface, the lower synchronous belt wheel set is connected with the lower synchronous rubber wheel set, and the lower synchronous rubber wheel set is distributed on the two sides of the ground track. The lower synchronous belt is wound between the lower synchronous belt wheel sets, and the driving motor drives the lower synchronous belt wheel sets. A plurality of rubber wheels are arranged to be in contact with the track at the same time and transmit power, different medicine load changes and track surface states in the intelligent pharmacy can be better adapted, and the walking efficiency of the intelligent pharmacy is improved.

This invention relates to the field of material handling technology, and specifically discloses an adjustable material handling robot. A drive component is fixedly connected to the side of the base, and the output end of the drive component is fixedly connected to the bottom of a sliding seat. A sliding seat is slidably connected to the inner side of the base, and a movable frame is fixedly connected to the top of the sliding seat. When a workpiece tends to slide downwards under external force or gravity, relative sliding friction is generated between the workpiece and the track. This friction drives the driven wheel of the track to rotate synchronously. A speed sensor on the transmission base starts monitoring, capturing the downward speed signal of the workpiece in real time, and dynamically adjusting the output speed of the drive component accordingly. This controls the positive rotation of the drive wheel, driving the track to move upwards at a speed exactly the same as the downward speed of the workpiece, forming a relatively stationary state where the track moves upwards and the workpiece moves downwards, thus counteracting the downward displacement of the workpiece.

The present disclosure relates to the technical field of insulation board processing, and an embodiment of the present disclosure provides an engraving machine for insulation board processing, which comprises an engraving machine body, a feeding rack is arranged on the side wall of the engraving machine body, a lifting feeding assembly is arranged on the feeding rack, and a driving feeding assembly is arranged on the side wall of the engraving machine body; the lifting feeding assembly comprises a sliding groove. Through the above technical scheme, the technical problem that the existing equipment adopts gear transmission or belt transmission to realize material conveying, but the gear meshing is prone to gap error, and the belt transmission is prone to slipping risk, especially in the conveying of materials such as insulation boards with smooth surfaces, if the traditional friction driving wheel lacks anti-skid design, the board conveying is prone to jamming or deviation due to insufficient friction, thereby causing the technical problems of misalignment of the engraved pattern and size deviation.

The invention relates to the technical field of baby chick placing boxes with preheating structures, and discloses a baby chick placing box with a preheating structure for baby chick incubation, the baby chick placing box comprises a box body, the bottom of the box body is fixedly connected with a plurality of support columns, the bottom of the box body is provided with a heating box, and the box body is internally provided with a plurality of incubation cavities. According to the device, an operator pulls the incubation drawer outwards along the incubation cavity, at the moment, friction driving wheels on the side wall of the incubation drawer extrude the top of the incubation cavity, and under driving of friction force, the friction driving wheels rotate to drive a second gear at the bottom of a first gear to rotate; a second gear drives a plurality of hatched eggs on a hatching frame on an angle adjusting shaft to be changed into a vertical state from an inclined state, and in this way, an operator can conveniently conduct sampling inspection on the hatched eggs; on the other hand, the gravity of the hatched eggs in the vertical state completely acts on the top of the rotating base, so that the rotating base rotates to drive the hatched eggs to rotate, and the egg turning process is more stable and smoother.

The utility model discloses a tandem type speed reduction transmission device and a mattress spring machine, and relates to the technical field of speed reducers, the tandem type speed reduction transmission device comprises at least two machine bodies arranged side by side; any machine body on the outermost side is provided with an input flange connected with power input equipment. Each machine body comprises a main box body; the transmission worm is rotatably arranged in the main box body; connecting holes are formed in the two ends of the worm, internal splines are annularly arranged on the inner walls of the connecting holes, and external splines matched with the internal splines are circumferentially arranged on the outer walls of the two ends of the connecting shaft; the transmission worms in all the machine bodies are coaxially connected in series through connecting shafts. The worm gear assembly is in friction transmission with the transmission worm; the worm gear assembly is used for outputting power; the transmission worm in each machine body is connected with the connecting shaft through a spline, so that the transmission strength among the machine bodies is improved; by adjusting the position of the external spline on the connecting shaft in the connecting hole, the distance between the machine bodies can be adjusted, and various use requirements are met.

This invention relates to the field of pipe support and vibration damping technology, and provides an impact-resistant pipe support, including a base with an inner ring rotatably fitted around the outside of a pipe. A ring gear is fixedly fitted onto the outer wall of the pipe. A vibration damping device is provided on the inner ring, comprising an outer ring rotatably fitted around the outside of the pipe, and multiple friction transmission mechanisms spaced circumferentially along the inner ring. Each friction transmission mechanism includes a swing arm that can swing axially around the inner ring. This invention, through the frictional engagement between the friction wheel and the outer ring, converts some of the motion generated during pipe vibration or axial displacement into rotation of the friction wheel, which, via a transmission mechanism and rolling gears, drives the inner ring to move circumferentially. This allows the working position of the friction transmission mechanism to be adjusted during use, thereby mitigating the problem of the friction wheel being fixed in the same circumferential position for a long time and experiencing concentrated wear.

This invention discloses a speed reducer with adjustable reduction ratio and its adjustment method, relating to the field of speed reducer technology. The key technical points are: it includes an upper planetary assembly and a lower planetary assembly. The upper planetary assembly includes an upper planet carrier, an upper sun gear, upper planet gears, and an upper ring. The lower planetary assembly includes a lower sun gear, lower planet gears, and a lower ring. The upper sun gear and lower sun gear are connected and rotate coaxially, and the upper ring and lower ring are connected and rotate coaxially. The lower planet gears are connected to the lower sun gear and lower ring via friction transmission. At least one of the lower ring and lower sun gear has a gradient radius. The lower planet gears are configured to move along the direction of the axial displacement component to change their axial position on the gradient radius working surface, thereby changing the working radius of the lower sun gear and / or the lower ring. Through the continuous change of the working radius, the overall transmission ratio of the speed reducer is continuously adjusted, achieving a compact structure and stepless speed regulation.

The utility model discloses a friction plate positioning structure, which relates to the technical field of friction transmission, and comprises two torque transmission pieces, a friction plate arranged between the working surfaces of the two torque transmission pieces, and an elastic pin, a limiting bulge is arranged on the outer side of one end of the elastic pin, and the limiting bulge is arranged on the outer side of the other end of the elastic pin. The other end of the elastic pin penetrates through the friction plate and is inserted into the inserting groove in the working face of one torque transmission piece. A plurality of expansion and contraction seams are formed in the positions, corresponding to the limiting protrusions, of the elastic pin, and the expansion and contraction seams are used for allowing the limiting protrusions to penetrate through the friction plates through contraction. According to the friction plate positioning structure, the friction plate is pre-positioned on the working face of the torque transmission piece through the elastic pin, so that the friction plate is more convenient to connect and position, meanwhile, the friction plate does not deform, and the friction transmission effect of the two torque transmission pieces is ensured.

The utility model discloses a monitor for environment monitoring, which comprises a mounting plate and further comprises a periodic revolution and rotation monitor, the periodic revolution and rotation monitor comprises a suspension, the upper surface and the lower surface of the suspension are respectively provided with a sliding groove, a wedge block is arranged in each sliding groove in a sliding manner, a sliding block is fixedly mounted on one side of each wedge block, and the other side of each wedge block is provided with a sliding groove; a servo motor is installed on one side of the sliding block in a butt joint mode, a rotating shaft is arranged at the output end of the servo motor, a friction wheel is arranged on one side of the rotating shaft and installed on the surface of the suspension in a friction transmission mode, and an environment monitor is arranged at the other end of the rotating shaft. According to the utility model, through the arrangement of the periodic revolution and rotation monitor, the monitoring equipment can revolve around the suspension, so that the video monitoring range is enlarged, and the occurrence of monitoring dead angles is avoided. In addition, the monitor can achieve the autorotation effect under the driving of the motor of the monitor, and the monitor is matched with the revolution motion of the main body, so that the monitoring range is greatly enlarged.

The application discloses a close-packed speed pursuit conveying mechanism and belongs to the technical field of conveying mechanisms. The mechanism comprises a primary adjustment mechanism for feeding and initially adjusting the interval of boxes, a conveying mechanism arranged on the primary adjustment mechanism for conveying the boxes, and a speed pursuit mechanism arranged on the conveying mechanism for adjusting the boxes into equal intervals. The primary adjustment mechanism is arranged to first comb and initially adjust the interval of the close-packed incoming boxes through limiting columns and material stirring distance setting, thereby laying a good foundation for subsequent fine adjustment. The speed pursuit mechanism adopts a unique chain plate type interval module. The boxes are accelerated through the friction drive of the speed pursuit rollers in the module until the boxes contact the front blocking plate and move synchronously with the module. Since multiple interval modules are fixed at equal intervals on the chain, the boxes conveyed by the interval modules are finally forced to be separated into completely equal intervals, which is more reliable than single adjustment mode.

The utility model discloses a waste discharge machine of a push type die-cutting machine, which belongs to the technical field of die-cutting, and comprises a bottom plate, two side plates are fixed on the top surface of the bottom plate, a plurality of driving rollers are rotatably connected between the two side plates, a plurality of ferromagnetic conveyor belts are in friction transmission on the outer sides of the driving rollers, and the ferromagnetic conveyor belts are arranged on the bottom surface of the bottom plate. A motor is fixed to the lower portion of the outer side of one side plate, the output end of the motor is coaxially and fixedly connected with one end of a rotating shaft of one transmission roller, a top plate and a base are further fixed between the two side plates, a plurality of through grooves are formed in the top face of the top plate, and the distance between the through grooves is larger than the width of the ferromagnetic conveying belt. And a plurality of guide rods are fixed between the top plate and the base. According to the utility model, the problem that the working efficiency is reduced due to the fact that a worker needs to take down printing contents from the ejector rod, stack the printing contents and then transfer waste edges into a waste box, and the process is relatively tedious is solved.

This invention discloses a thin traction machine with a split-type inductive encoder, relating to the technical field of thin traction machines. It includes a permanent magnet synchronous motor and a traction sheave assembly. The permanent magnet synchronous motor has an output shaft fixed to its end, and the traction sheave assembly includes a traction sheave disc sleeved and fixed to the outer wall of the output shaft. This thin traction machine with a split-type inductive encoder uses the rotation of the traction sheave disc to cause a piston plate entering the upper semi-circular rotation area to slide against the inner side of the semi-circular force-applying plate, triggering the clamping column to extend the steel wire rope for physical clamping and synchronous transmission along the same line. When entering the lower semi-circular rotation, the piston plate and clamping column automatically reset to release the clamp. Thus, through the anti-slip mechanism of upper semi-circular rotation triggering – area clamping – lower semi-circular rotation release, physical clamping replaces simple friction transmission, completely eliminating the risk of slippage. Furthermore, clamping and release are automatically completed with the rotation of the traction sheave disc, requiring no additional control system, which conforms to the passive safety design concept of elevators.

The invention relates to the technical field of building construction, and particularly discloses a protective fence structure for building construction. The fence frame is fixedly connected to the top end of the fence seat; through the rotating mechanism, the lifting mechanism, the connecting mechanism and the speed reducing mechanism, when the working motor is started to run, the power output shaft of the working motor drives the rotating wheel to start to rotate at a constant speed, stable friction transmission connection is formed through the high-strength transmission belt and the transmission wheel, and then the transmission wheel is driven to do synchronous circular motion. According to the transmission system, the crank-link mechanism principle is adopted, and rotary motion of the transmission wheel is converted into reciprocating swing of the first hinge rod. The speed reduction transmission mechanism and the spraying head are integrally mounted on the follow-up sliding plate seat, so that the spraying system can synchronously finish vertical displacement from the bottom of the fence to the top of the fence along with the sliding plate seat, and directional dust fall spraying is continuously kept in the movement process.

A friction transmission belt includes a compression layer forming a pulley contact portion, the compression layer includes an inner layer formed from a rubber composition and an outer layer provided on a pulley contact side of the inner layer and formed from a fiber member, and a ratio (M10 modulus / M50 modulus) of an modulus at 10% elongation in a belt longitudinal direction (M10 modulus) to an modulus at 50% elongation in the belt longitudinal direction (M50 modulus), of the rubber composition, is not less than 1.5.

The present application provides a kind of friction gear (100), it has the contact between the friction transmission body (20) of the output component (30) and multiple friction transmission mechanism (10) by taking out output rotation and transmits power, and the contact surface of output component (30) is inclined relative to axial, the friction gear has the output component (78) for transmitting output rotation to driven device and the shaft coupling (70) of linking output component (30) and output component (78).Shaft coupling (70) is configured to be more easily deformed relative to the load on the axis than output component (30) and output component (78), and has the function of absorbing the misalignment of the shaft center between output component (30) and output component (78) and the function of transmitting torque to the output component (30) side after converting the torque acting on the output component (78) into axial force.

The application provides a deburring device for a car headrest rod, which comprises a deburring machine and a clamping and rotating device, the clamping and rotating device can clamp and move the headrest rod and interact with the deburring machine to remove burrs on the outer wall of the vertical rod; the deburring machine comprises an annular sand belt and a limiting block with a groove arranged close to the annular sand belt, after the vertical rod is inserted into the groove, the vertical rod can abut against the annular sand belt and generate a force; the clamping and rotating device comprises a clamping jaw capable of clamping the horizontal rod, a feeding driving mechanism for driving the clamping jaw to move forward and backward so that the vertical rod is inserted into or taken out of the limiting block, a friction driving mechanism for driving the clamping jaw to rotate around the limiting block, and a switching driving mechanism for driving the clamping jaw to move and switch two vertical rods. The clamping and rotating device is arranged to clamp and move the headrest rod, so that the automatic deburring work of the two vertical rods of the headrest rod is realized, and only manual auxiliary feeding and discharging are needed, so the labor intensity of people is greatly reduced.

The invention belongs to the technical field of concrete prefabricated parts, and discloses steel bar positioning equipment for commercial concrete prefabricated parts, which comprises a main body box, a mold box is fixedly arranged on the inner wall of the bottom of the main body box, air pressure matching clamping assemblies are arranged on the side walls of the two sides of the main body box, and an air pressure measuring clamping assembly is arranged on the top wall of the main body box. The air pressure matching clamping assembly is connected with the air pressure measuring clamping assembly through a pipeline, and through the synergistic effect of the air pressure measuring clamping assembly and the air pressure matching clamping assembly, in combination with cooperation of a downward pressing measuring clamping plate and a reinforcing steel bar clamping groove and driving of a screw of a side clamping frame, the reinforcing steel bar is clamped. According to the equipment, automatic recognition, self-adaptive clamping force adjustment, accurate positioning and automatic centering of the reinforcing steel bars are achieved, the equipment clamps the reinforcing steel bars in a lossless mode in a friction transmission mode, damage to the reinforcing steel bars caused by a traditional mechanical clamping mode is avoided, automatic operation of reinforcing steel bar positioning and clamping is achieved through the automatic control principle, and the working efficiency is improved. And the steel bar positioning precision and the prefabricated part quality are effectively improved.

The utility model discloses a shuttle braid winding device which comprises a box body, a friction driving device is installed through the box body, clamping devices used for clamping reels are arranged at the front end and the rear end of the box body in a sliding mode, the clamping devices are driven by the driving device, a front side plate and a rear side plate are installed on the right side of the box body, and the front side plate and the rear side plate are arranged on the right side of the box body. A tensioning device for tensioning the shuttle braid is mounted through the side plate; the device can be used for winding on two sides simultaneously, the winding efficiency is improved, and the device can be disconnected independently.

Provided is a trouser waist machine. The trouser waist machine mainly solves the problem that when an existing trouser waist machine is used for processing fabric which is large in elasticity, smooth in surface or uneven in thickness, the slipping phenomenon is prone to occurring. According to the trouser waist machine provided by the invention, two independent transmission mechanisms are driven by the same upper shaft, and two groups of conveying wheel assemblies are directly and synchronously driven, so that the problems of slipping and asynchronization of feeding and discharging caused by friction transmission in the traditional design are fundamentally solved, and the sewing quality is remarkably improved.

The invention discloses a fan high-speed brake safety test device, and particularly relates to the technical field of fan brake testing, the fan high-speed brake safety test device comprises a limiting seat, a clamping brake test assembly is arranged in the middle of the limiting seat, the clamping brake test assembly comprises a deflection frame arranged in the limiting seat, and reinforcing plates are installed at the two ends of the deflection frame through bolts. Through cooperation of the arc-shaped guide groove and the sliding rod, the first electric push rod drives the abutting plate and the transmission disc to move, the pressure applying position and the pressure gradient can be dynamically adjusted, the actual stress state of the high-speed brake disc can be accurately simulated, the stability of the brake system under the sudden change load can be effectively verified, and the stability of the brake system under the sudden change load can be effectively verified. The braking failure risk caused by pressure step in a traditional test is avoided, meanwhile, a transmission wheel, a conveying belt and a rotating speed tester linkage mode is adopted, the rotating speed of the brake disc is converted into a quantifiable electric signal through friction transmission, millisecond-level monitoring of rotating speed changes in the braking process is achieved, and convenience in the test process is improved.

This utility model discloses a double-pulley device for a stair climber, relating to the field of fitness equipment and applied to a stair climber. It includes a dual-pulley resistance source with a first drive wheel and a second drive wheel; a first pulley assembly including a first pulley and a first belt, the first belt coupling the first drive wheel to a drive shaft; and a second pulley assembly including a second pulley and a second belt, the second belt coupling the second drive wheel to a drive shaft. The first pulley assembly is configured for high-friction transmission; the second pulley assembly is configured for low-friction transmission, with its friction being less than that of the first pulley assembly. This allows it to provide a buffering damping force to the drive shaft by slipping when the first belt fails. During normal operation, the device operates automatically. However, when the first belt slips off or fails, the friction between the second pulley and the second belt provides sufficient damping force to slow the descent of the stair treads, thus providing a buffering and protective function.