42results about How to "Change the installation angle" patented technology

The invention relates to the technical field of machines, and discloses a pipeline supporting assembly convenient to mount and demount. The pipeline supporting assembly comprises a supporting base. Asupporting plate is movably mounted at the top of the supporting base. A limiting column is fixedly mounted at the position, located on the left side of the supporting plate, of the top of the supporting base. According to the pipeline supporting assembly convenient to mount and demount, through the arrangement of a first adjusting rod and a second adjusting rod, a first moving block, a second moving block and clamp blocks can be adjusted to proper positions by twisting the first adjusting rod and the second adjusting rod, and it is guaranteed that a pipeline can pass through a mounting cavityformed by the arc face between the two clamp blocks; locking bolts are inserted and mounted in locking holes in the surface of locking ribs at the tops of the clamp blocks, and the two clamp blocks are fixed and clamped; the positions of supporting rods in a supporting mechanism are adjusted, the tops of the supporting rods abut against the bottoms of the clamp blocks, and the aims of supportingthe clamp blocks and further fixing the clamp blocks are achieved; and the pipeline is more stable, and mounting, demounting and maintenance of the pipeline are facilitated.

The invention provides a load-bearing connector test specimen clamp for a fatigue test machine, and solves the problems that the existing clamp cannot meet the requirements of correct clamping, accurate detection, multi-position stretching and fatigue test and the like. The load-bearing connector test specimen clamp for the fatigue test machine comprises a clamping mechanism, an angle regulating mechanism and a base, wherein the clamping mechanism is assembled between upper and lower connecting rods of the fatigue test machine and is used for clamping and installing a load-bearing connector test specimen. The load-bearing connector test specimen clamp is mainly characterized in that the clamping mechanism consists of upper and lower clamping plates and a fastening element screw bolt; screw bolt holes are formed in the peripheries of the upper and lower clamping plates; the load-bearing connector test specimen is hinged to the upper connecting rod through a pin shaft; the base is assembled with a fatigue test machine platform through the lower connecting rod; the angle regulating mechanism consists of a box body provided with a crank transmission mechanism and a semicircular worm wheel block assembled in a box body rotating groove. The load-bearing connector test specimen clamp has the advantages that the structural design is reasonable; the clamping and positioning accuracy of the load-bearing connector test specimen is ensured; the mounting and the dismounting are convenient; the clamping is stable; the connection of components and the effective transmission and distribution of the load can be really simulated; the multi-position stretching and fatigue test result accuracy can be obviously improved.

The invention discloses a handheld micro-electromechanical system (MEMS) optical scanning device which comprises a handle, a probe, a connecting tube and a photoelectric connection line. A through channel is formed inside the handle, a cavity is formed at the tail end of the handle, and a socket is installed inside the cavity. The photoelectric connection line is in conducting connection with the socket. The tail end of the probe is connected with a plug which can be connected with the socket. An optical fiber cable and an electric connection line which are connected with the plug are arranged in the probe and the connecting tube. After being connected, the probe and the connecting tube are embedded in the handle, the plug is connected with the socket to realize photoelectric conductivity. The scanning probe can be replaced for the MEMS optical scanning device, the one-handle multi-probe using mode can meet the requirement for scanning imagery at different angles, real-time imaging scanning of tissues at different parts such as the oral cavity, the skin and the surgical parts can be achieved, doctors have less difficulty in operation, and the diagnostic imaging scanning time is significantly reduced.

The invention discloses a shower head which comprises a head shell. Both ends of the head shell are respectively provided with a first chamber and a second chamber with openings, and a water channel for conduction is arranged between the two chambers; the internal wall of the first chamber is provided with an internal thread, a water outlet in threaded connection with the internal thread is arranged in the first chamber, and the water outlet comprises a spacer in contact connection with the bottom of the chamber, a gland in threaded connection with the internal thread of the first chamber and a nozzle arranged between the gland and the spacer and penetrating through the gland; the second chamber is arranged into a structure forming 45 DEG to the central axis of the head shell, one end face close to the second chamber is also arranged to be 45 DEG to the central axis of the head shell, the internal end of the second chamber is provided with a first seal ring, and the external end is provided with a clamp spring; and a hollow rotating shaft penetrates through the clamp spring and can rotate 360 DEG in relative to the head shell, one end of the rotating shaft arranged in the second chamber is a spherical structure and can be clamped by the clamp spring and the first seal ring, and the other end of the rotating shaft is provided with a second seal ring and an external thread.

The invention provides a variable-cycle large-bypass-ratio turbofan engine. The variable-cycle large-bypass-ratio turbofan engine comprises a plurality of turbine guide vanes. The turbine guide vanescomprise blade parts with fixed structures and a plurality of movable blade segments, wherein the movable blade segments are connected through hinges, and a hollow area is formed by the movable bladesegments and the blade parts with the fixed structures. The movable blade segments are changed to rotate towards the interiors or exteriors of the turbine guide vanes, so that the throat area betweentwo turbine guide vanes is adjusted. Under the condition of the high bypass ratio, the flow areas of the turbine guide vanes are reduced, the booster stage guide vane installing angle is changed, andthe booster stage anti-surge effect can be achieved; the energy loss caused by gas discharge after the booster stage is avoided, and non-gas discharge of the full-envelope booster stage is realized; more air can pass through an inner bypass so as to provide larger margin for the development of the thrust of the engine.

The invention discloses an adjustable water-turbine generator set cooling fan which comprises a fan center, blades, operating force arms, driving pins and synchronous operation rings. A pivot is arranged at one end of each blade, a plurality of first through holes are circumferentially formed in the fan center, the end of each pivot is connected with one end of the corresponding operating force arm through a cylindrical pin after the pivot penetrates the corresponding first through hole, and the other end of the operating force arm is connected with the corresponding synchronous operation ring through the corresponding driving pin. Special bearing bushes are arranged among the pivots and a shaft hole of the fan center to accurately position and decrease an operating torque, one end of each operating force arm is clamped on the pivot of the corresponding blade, mounting and adjusting are facilitated when reliable operations are ensured, the other end of the operating force arm is connected with the corresponding synchronous operation ring through the corresponding driving pin, the synchronous operation rings slightly move along the axis direction of a generator shaft to drive the operating force arms to rotate around axes of the pivot of the blades, and mounting angles of the blades are changed.

The present invention relates to steering operation mechanical for motor tricycle, three wheeler, low speed transport vehicle, etc and is especially one kind of hydraulic direction machine. The hydraulic direction machine includes one shaft with annular slot, one steering wheel in the top of the shaft, one driving oil cylinder the shaft is inserted in, one executing oil cylinder with oil returning port and oil inlet communicated separately with the oil inlet and the oil returning port of the driving oil cylinder, and one rocker connected through a round head to the top of the piston in the executing oil cylinder. The hydraulic direction machine has driving mechanism and executing mechanism separately set and connected through middle hose, and this result in convenient design and installation of the steering mechanism and high adaptability.

The invention relates to the technical field of agricultural machines, and discloses a rice planting soil restoration device. The rice planting soil restoration device comprises a device shell, a shovel plate is fixedly installed at the front end of the device shell, a conveying belt is movably installed on the lower portion of the interior of the device shell, a rotating rod is movably installedin the middle of the conveying belt, a first belt wheel is fixedly installed at one end of the rotating rod, a first belt is movably installed on one side of the interior of the first belt wheel, stirring blades are movably installed above the conveying belt, and rotating shafts are fixedly installed in the middles of the stirring blades. According to the rice planting soil restoration device andmethod, the shovel plate is fixedly installed at the front end of the device shell and is in a comb tooth shape, soil can be conveniently screwed up when the device moves on the soil, waste plastic films and plant root systems in the soil can be shoveled through the comb tooth shape, it is conveniently ensured that impurities in the soil are treated, and the soil is restored conveniently.

The invention relates to the technical field of 5G network communication equipment, in particular to a 5G communication-used 5G base station convenient to adjust. The base station comprises a vertical cylinder, a vertical rod is fixedly arranged at the top end of the vertical cylinder, a base station body is mounted on the side of the vertical rod, the vertical rod is fixedly provided with a track frame and a support frame, and the base station body is fixedly provided with a roller in rolling fit with the track frame and a hinge shaft in running fit with the support frame. A rigid rope is fixedly mounted on the base station body, a guide pipe is fixedly mounted on the vertical rod, a spring mounting seat is fixedly arranged on the guide pipe, a spring is fixedly arranged between the spring mounting seat and the base station body, a winch is fixedly mounted on the vertical cylinder, and one end, far away from the base station body, of the rigid rope penetrates through the guide pipe and then is wound on a winding drum of the winch. Through traction of the rigid rope, the base station body smoothly and stably slides on the track frame with the hinged shaft as the center, the installation angle of the base station body can be conveniently changed, climbing operation is not needed, and the base station is safe, reliable, low in manufacturing cost and convenient to maintain.

The invention discloses a centrifugal pump which comprises a shell, a water outlet and a cover plate, wherein the water outlet is formed in one side of the shell, the cover plate is arranged in the shell, a connecting axle sleeve is arranged at the center of the cover plate, a plurality of arc blades are uniformly arranged at two sides of the cover plate, an arc head is fixed at one end of each ofthe arc blades, a damping mounting seat mechanism is connected to two sides of the bottom of the shell by two pairs of support rods which are hinged, a water inlet is formed in the other side of theshell, and a filtering mechanism is arranged at one side of the water inlet. According to the scheme, an arc water guide plate arranged at one end of the arc blade can guide water, so as to prevent water flowing to the connecting sleeve from flowing without restraint to reduce the centrifugal strength, and the design of an annular water blowing plate can reduce resistance of the cover plate to water after entering the shell, so as to improve the centrifugal efficiency; and due to the design of the damping mounting seat mechanism, the mounting angle can be changed flexibly according to mountingarea, so as to extent the use scope.

The invention discloses a novel grain cleaning and drying integrated device. The integrated device comprises a vibrating screen mechanism, a bucket elevating mechanism, a tower drying mechanism, a duster mechanism, a heat pump mechanism, a centrifugal fan, a spiral conveying mechanism and a movable support structure, wherein a material outlet of a vibrating screen is connected with a material inlet of the bucket elevating mechanism, a material feeding port of the bucket elevating mechanism is connected with a material inlet of the tower drying mechanism by virtue of a spout, the material outlet of the tower drying mechanism is connected with a material feeding port of the spiral conveying mechanism, a cold air outlet of the tower drying mechanism is connected with an inlet of the duster mechanism, a hot air inlet of the tower drying mechanism is connected with a hot air outlet of a heat pump, and a cold air inlet of the heat pump is connected with an air outlet of the centrifugal fan.In operation, grains enter the vibrating cleaning screen mechanism and then enter the drying machine, hot air transversely enters the drying machine to perform heat exchange, the grains are dried andthe dried grains enter the spiral conveying mechanism to finish conveying of the grains; and the mechanisms are convenient and easy in operation.

The invention discloses greenhouse gas emission reduction monitoring equipment based on a carbon neutralization condition, relates to the technical field of environment monitoring, and solves the problems that an existing greenhouse gas monitoring device cannot adjust the monitoring height during use, is low in detection precision and is easily influenced by the wind direction, so that the sampling accuracy is low, and the monitoring effect is influenced. The greenhouse gas emission reduction monitoring equipment based on the carbon neutralization condition comprises a base, a first-stage lifting rod which is slidably connected to the upper part of the base, a lifting driving piece which is fixedly connected to the lower part of the base, a first-stage lifting driving mechanism and a second-stage lifting rod, wherein the first-stage lifting driving mechanism is arranged in the base, and the lifting driving piece drives the first-stage lifting rod to slide up and down through the first-stage lifting driving mechanism; and the second-stage lifting rod is slidably connected to the upper part of the first-stage lifting rod. According to the invention, compared monitoring at different heights can be realized, higher monitoring accuracy is achieved, the influence of the wind direction can be reduced, and the monitoring accuracy is improved.

The invention discloses a handheld micro-electromechanical system (MEMS) optical scanning device which comprises a handle, a probe, a connecting tube and a photoelectric connection line. A through channel is formed inside the handle, a cavity is formed at the tail end of the handle, and a socket is installed inside the cavity. The photoelectric connection line is in conducting connection with the socket. The tail end of the probe is connected with a plug which can be connected with the socket. An optical fiber cable and an electric connection line which are connected with the plug are arranged in the probe and the connecting tube. After being connected, the probe and the connecting tube are embedded in the handle, the plug is connected with the socket to realize photoelectric conductivity. The scanning probe can be replaced for the MEMS optical scanning device, the one-handle multi-probe using mode can meet the requirement for scanning imagery at different angles, real-time imaging scanning of tissues at different parts such as the oral cavity, the skin and the surgical parts can be achieved, doctors have less difficulty in operation, and the diagnostic imaging scanning time is significantly reduced.

The invention relates to a bag placing structure for a packaging machine. The bag placing structure for the packaging machine comprises a support arranged in the perpendicular direction and a bag placing board arranged on the support and is characterized in that the bag placing structure further comprises a clamping board fixed to the support and opposite to the bag placing board and a driving device capable of driving the bag placing board to be close to or far away from the clamping board. According to the bag placing structure for the packaging machine, the clamping board is additionally arranged on the bag placing board used for supporting a packaging bag and the corresponding driving device is offered, so that the packaging bag placed between the clamping board and the bag placing board is clamped through matching of the clamping board and the bag placing board, and the bag placing structure is particularly suitable for the condition that the bag placing board is obliquely arranged and matched with a mechanical arm capable of well and stably grabbing the packaging bag. In addition, the bag placing structure for the packaging machine enables the clamping degree and the number of the contained packaging bags to be adjustable and use is convenient and flexible.

The invention relates to an agricultural tool, namely an energy-saving efficient rotary tiller. The energy-saving efficient rotary tiller comprises a traction frame (1), a cross shaft (2), a cutter disc (5), a blade (6) and a transmission component which is connected with a power output shaft of a tractor. The invention is characterized in that an included angle alpha between the straight line of the cutting edge side of the blade (6) or the midline (10) of the blade (6) and the radial line (9) from the center of an installation hole (8) at the inner end of the blade (6) to the center of the cutter disc (5) is between 60 degrees and 80 degrees. The installation angle of the blade is changed, the cutting performance is improved, the blockage of weeds is avoided, and the cutting effect of the cutter disc is exerted adequately. In addition, a strengthening frame is arranged above a rack, so the rigidity and stability of the tool are improved. On the premise of ensuring tilling depth, the power consumption is greatly lowered, and the operation efficiency of the tool is improved. The invention has the characteristics that the energy-saving efficient rotary tiller has a simple structure, the cost is low, the installation is convenient, and the like. The energy-saving efficient rotary tiller has considerable market prospects.

The present invention provides a turbofan engine with variable cycle and high bypass ratio, which comprises a plurality of turbine guide vanes, the turbine guide vanes include blade parts of a fixed structure, and a plurality of movable blade segments, and the plurality of movable blades The segment is connected by a hinge and forms a hollow area with the blade part of the fixed structure; by changing the movable blade segment to rotate to the inside or outside of the turbine guide vane, the distance between the two turbine guide vanes can be adjusted. Throat area. Under the condition of high bypass ratio, the invention reduces the flow area of ​​the guide vane of the turbine and changes the installation angle of the guide vane of the supercharging stage, which can achieve the effect of anti-breathing of the supercharging stage; avoids the energy loss caused by the deflation after the supercharging stage, Realize the all-envelope supercharging stage without blow-off; the connotation can pass through more air, which can provide a greater margin for the development of engine thrust.

The invention relates to a bag placing structure for a packaging machine. The bag placing structure for the packaging machine comprises a support arranged in the perpendicular direction and a bag placing board arranged on the support and is characterized in that the bag placing structure further comprises a clamping board fixed to the support and opposite to the bag placing board and a driving device capable of driving the bag placing board to be close to or far away from the clamping board. According to the bag placing structure for the packaging machine, the clamping board is additionally arranged on the bag placing board used for supporting a packaging bag and the corresponding driving device is offered, so that the packaging bag placed between the clamping board and the bag placing board is clamped through matching of the clamping board and the bag placing board, and the bag placing structure is particularly suitable for the condition that the bag placing board is obliquely arranged and matched with a mechanical arm capable of well and stably grabbing the packaging bag. In addition, the bag placing structure for the packaging machine enables the clamping degree and the number of the contained packaging bags to be adjustable and use is convenient and flexible.

The invention discloses an integrated solar intelligent street lamp. The integrated solar intelligent street lamp comprises a street lamp body, a supporting rod, a universal ball and two telescopic rods, wherein the street lamp body comprises a shell, a light-emitting assembly, a control assembly, a storage battery and a solar panel; the upper end of the shell is of an open structure, and the solar panel covers the upper end of the shell so as to seal the upper end of the shell; the inner bottom of the shell is sunken downwards to form a groove, the storage battery and the control assembly are arranged in the groove from bottom to top, and the light-emitting assembly is arranged at the outer bottom of the shell; the upper end of the supporting rod is connected with the outer bottom of the shell through a universal ball; and one end of each telescopic rod is connected with the supporting rod through a universal ball, and the other end of each telescopic rod is connected with the outer bottom of the shell through a universal ball. The integrated solar intelligent street lamp is simple in structure, compact in layout, small in occupied space, convenient to install, capable of adjusting the inclination direction of a solar panel and the irradiation direction of the light-emitting assembly, high in intelligent degree and high in waterproof capacity.

The invention provides a cement real wood simulator, and relates to the technical field of landscape construction. The problems are solved that workers can complete the manufacturing of simulating wood by frequently changing various tools and it needs to take long time in the whole manufacturing process. The cement real wood simulator comprises a fixed support. A handle is axially connected with the right side of the top of the fixed support. Six annual ring drawing mechanisms are axially connected with the right side of the fixed support. A rotating plate and six crack drawing blocks are axially connected with the right side of the fixed support and press upwards through elastic components correspondingly. The cement real wood simulator can draw annual rings with different shapes and meanwhile can draw cracks with different angles, the simulating effect of a cement pile is greatly improved, the requirement for the differences of different woods during drawing is met, the cement real wood simulator is easy to operate, the simulating wood can be rapidly drawn, the drawing efficiency is improved, and the workload of workers is greatly reduced.

The invention discloses an anti-caking raw material pre-wetting device suitable for biotechnology, relates to the technical field of biotechnology, and solves the problems that a pre-wetting device in the prior art difficultly ensures uniform mixing of materials and water in use, and meanwhile, the materials are easy to harden, so that the humidity of the materials is not uniform enough, subsequent biological processing is influenced, and the quality of products is influenced. The anti-caking raw material pre-wetting device suitable for biotechnology comprises a mounting base; the left side of the mounting base is rotationally connected with a group of angle adjusting operation pieces; a group of angle adjusting sliding pieces are connected to the interior of the left side of the mounting base in a sliding manner; the left end face of an upper shell is fixedly connected with a group of rolling driving pieces; and eleven groups of fragment middle transmission pieces are rotationally connected to the interior of the mounting base. According to the invention, the discharging speed of materials can be conveniently adjusted, meanwhile, uniform stirring can be guaranteed, so that the pre-wetting effect can be guaranteed; meanwhile, material hardening can be well prevented; the pre-wetting speed is high; the humidity after pre-wetting is balanced; and the production quality is guaranteed.

The invention discloses a fan blade connecting device and a fan comprising the fan blade connecting device, and relates to the technical field of fans. The fan blade connecting device comprises a body. The middle portion of the body is a columnar locating platform, an upper installation plate with an installation hole is arranged on the upper end face of the columnar locating platform, and a lower installation plate with an installation hole is arranged on the lower end face of the columnar locating platform. A space included angle alpha is formed between the upper installation plate and the lower installation plate. The fan comprises a fan hub and fan blades, wherein the fan hub is connected with the fan blades through the fan blade connecting device. Compared with the prior art, the middle portion of the fan blade connecting device is in a columnar structure, change of an installation angle of the fan blades is convenient to achieve, and the fan is formed through fixed connection of the fan blades and the fan hub through the fan blade connecting device, so that the fan blades are convenient to install and disassemble, and the fan is low in cost and easy to popularize and apply.

The invention discloses a vortex-induced vibration test device for marine umbilical cables, relates to the technical field of test devices, and solves the problem that in the existing vortex-induced vibration test device, the installation angle of the general cable is fixed, the adjustment is complicated, and it is difficult to achieve a good contrast effect. At the same time, when the existing vortex-induced vibration test device is installed on the cable, the operation is complicated, which affects the test efficiency, including the support frame; the right side of the top of the support frame is fixed with multiple sets of the tightness adjustment motors; the support The bottom right side of the frame is fixedly connected with multiple groups of the winches; the top left side of the support frame is fixedly connected with multiple groups of the tilt adjustment motors; the upper left end surface of the support frame is axially connected with multiple groups of the tilt drive shafts . The device can realize quick disassembly of cables, is simple to use and is convenient to operate, and can fix cables of different thicknesses to improve adaptability.

The invention provides a surface reciprocating type polishing machining device for hydraulic accessory production, and relates to the technical field of paint spraying. The diameter adjusting mechanism is arranged in the polishing swing seat, and the diameter adjusting mechanism drives the diameter adjusting swing seat to swing; and the angle adjusting mechanism is arranged in the polishing swing seat, and the angle adjusting mechanism drives the grinding tool mounting seat to rotate. Reciprocating rotation is adopted for polishing the outer circle face, rotation of a workpiece is avoided, the grinding tool is suitable for machining parts large in size, rotation of the grinding tool installation base is achieved, the installation angle of the grinding tool installation base is changed, polishing machining of a conical face or an end face is achieved, the machining range is larger, and the machining effect is better; the problems that a traditional polishing machining device is large in machining difficulty for large parts, and meanwhile an existing polishing device only conducts polishing machining on cylindrical faces generally and is difficult to conduct polishing machining on conical faces and end faces are solved.

The invention belongs to the field of electrical production and manufacturing, and in particular discloses a production process of a metal fitting and an insulator series connection integrated device. The technical scheme adopted in the present invention is: a production process of a metalware and insulator series connection integrated device, including the following steps: Step 1, low-pressure casting a strain clamp with a crimping hole; Step 2, low-pressure casting with a pressure Connecting fittings for connecting holes; step 3, making matching insulators; step 4, making plastic inner wedges compatible with step 1 strain clamps; step 5, connecting the strain clamps with crimping holes in the above steps, The fittings and insulators are crimped to form a device in which fittings and insulators are connected in series, and the inner wedge is put into the threading slot of the strain clamp. This kind of device is connected in series, simple in structure, efficient in installation, convenient in maintenance, energy-saving and environmentally friendly, superior in performance, good in mechanical properties and light in weight, and can better adapt to the development requirements of the continuous upgrading of overhead conductors in the power industry.

The invention relates to the technical field of sealing devices, in particular to an adjustable high-strength valve rod connecting seat which comprises a bottom connecting disc and a top connecting rod. According to the adjustable high-strength valve rod connecting base, the connecting end of the top of the upper overturning supporting plate is controlled to ascend and descend through the internal thread adjusting ring, so that the mounting angle of the lateral supporting mechanism is changed, the telescopic length of the transverse telescopic assembling plate is controlled, the adjustable high-strength valve rod connecting base can be matched with valves of different specifications and sizes, and the application range is widened; a transverse telescopic assembling plate and a lower turnover supporting plate which are movably connected are arranged on a bottom connecting disc, an upper turnover supporting plate is arranged on the outer side of a top connecting rod, and the lower turnover supporting plate and the upper turnover supporting plate are connected to the outer side of a valve rod upper seat in a clamped mode to form an inclined supporting and adjusting mechanism. Therefore, the supporting force of the outer side of the valve rod upper seat is improved, and the compressive strength is greatly improved.

The invention discloses a prepressing device of a hanging basket for a cantilever construction bridge support, and relates to the field of bridge construction. The prepressing device of the hanging basket for the cantilever construction bridge support comprises a pre-pressing supporting frame, a welding folding rod is welded to the upper end face of the pre-pressing supporting frame, the other side of the welding folding rod is connected to the outer side wall face of a hanging basket inclined supporting device through a screw, and an angle adjusting device is installed on the upper right side of the hanging basket inclined supporting device. A hanging basket angle adjusting column is installed in an inner hole of the angle adjusting device in a matched mode, an inner-layer welding rod is connected to the bottom face of the hanging basket angle adjusting column through a screw, the other side of the inner-layer welding rod is welded to the upper end face of a material sun visor, a weight hanging basket is installed on the bottom face of the material sun visor in a swinging mode, and an outer side protection plate is welded to the outer side of the weight hanging basket. End base supporting devices are installed on the two sides of the hanging basket angle adjusting column, and the bottom faces of the end base supporting devices are welded to the top face of the top end welding frame. The prepressing device can be stably supported, and the mounting angle of the hanging basket can be adjusted.

The invention discloses a fan blade connecting device and a fan comprising the fan blade connecting device, and relates to the technical field of fans. The fan blade connecting device comprises a body. The middle portion of the body is a columnar locating platform, an upper installation plate with an installation hole is arranged on the upper end face of the columnar locating platform, and a lower installation plate with an installation hole is arranged on the lower end face of the columnar locating platform. A space included angle alpha is formed between the upper installation plate and the lower installation plate. The fan comprises a fan hub and fan blades, wherein the fan hub is connected with the fan blades through the fan blade connecting device. Compared with the prior art, the middle portion of the fan blade connecting device is in a columnar structure, change of an installation angle of the fan blades is convenient to achieve, and the fan is formed through fixed connection of the fan blades and the fan hub through the fan blade connecting device, so that the fan blades are convenient to install and disassemble, and the fan is low in cost and easy to popularize and apply.