38results about How to "Simple linkage structure" patented technology

The invention discloses a fertilizer slurry stirring and emulsifying device and relates to fertilizer production equipment. The fertilizer slurry stirring and emulsifying device comprises a seat body, an emulsifying barrel and a stirring device, wherein the emulsifying barrel is fixed to the seat body, the emulsifying barrel comprises an outer barrel body and an inner barrel body, a partition plate is arranged in the middle of the outer barrel body, the inner barrel body is arranged in the outer barrel body and is fixed with the outer barrel body through the partition plate, a sealing cover is arranged at the top of the outer barrel body, and a discharging valve is arranged at the lower end of the outer barrel body; the stirring device comprises a driving motor, a stirring blade and a piston, the driving motor is arranged on the seat body, the stirring blade is arranged at the lower portion of the outer barrel body, the stirring blade is further in rotary connection with the outer barrel body, and the stirring blade is connected with the driving motor; the piston is in slide connection in the inner barrel body, a cylindrical cam is arranged at the lower end of the piston, and a linkage block matched with the cylindrical cam is arranged on a rotation shaft of the stirring blade; a first one-way valve is arranged on the partition plate, a second one-way valve is arranged on the piston, and an opening direction of the first one-way valve is opposite to an opening direction of the second one-way valve. The fertilizer slurry stirring and emulsifying device has a good stirring effect and can quickly emulsify slurry.

An array linkage type solar energy two-degree-of-freedom tracking system comprises a supporting mechanism, a tracking mechanism, a linkage mechanism, and a driving device, wherein the supporting mechanism supports a battery panel tray by using a cardan joint and a vertical shaft; the tracking mechanism is connected to a transmission gear by using the linkage mechanism, the driving device is connected to the linkage mechanism, the linkage mechanism is connected to a tracking crank by using a linkage diverter and a linkage connecting rod, and performs successive disjunction distribution and winding cascading on two types of linkage nodes a and b along an azimuth angle (or altitude angle) linkage direction by using a steel wire rope, to implement power transmission between nodes in an array. According to the present invention, the quantity of driving devices and the quantity of sensors are reduced, a structure is relatively simple, and array linkage type solar energy two-degree-of-freedom tracking is implemented with low costs, so that not only a solar energy utilization ratio is improved, but also a geography adaptive capacity is enhanced, and array expansion is simpler and more convenient; and the quantity of battery panel components carried by a single tracking device is greater, and an area is larger.

The invention relates to a food processing device, in particular to a steamed stuffed bun forming machine. In the technical scheme provided by the invention, the steamed stuffed bun forming machine is characterized by comprising a mounting base, a forming and covering mechanism, a transmission mechanism and a driving mechanism driving the transmission mechanism. The transmission mechanism is matched with the forming and covering mechanism to enable the forming and covering mechanism to reciprocate along the axial direction of the mounting base and to expand and fold. The forming and covering mechanism comprises a sliding disk and a swingable jack catch in circumferential hinge with the sliding disc. The transmission mechanism comprises a ejector rod, a transmission shaft linked to the driving mechanism and a transmission unit used for the linkage between the ejector rod and the transmission shaft. By using the above technical scheme, the invention provides the steamed stuffed bun forming machine which has high processing speed and reduced production cost.

The invention relates to an aerial work platform with a high-stability steering running function. The aerial work platform comprises a running base plate and a lifting device, wherein the running base plate comprises a base plate, a running device, a pit protection mechanism and supporting leg structures, wherein the running device comprises a left steering wheel, a right steering wheel, a left wheel carrier, a right wheel carrier, a linkage rack, a steering cylinder and a steering curved slab; each supporting leg structure comprises a trolley frame board, a supporting leg seat board, a supporting leg mounting board, a supporting outer tube, a supporting inner tube and a supporting foot; and the lifting device comprises a scissor-fork lifting structure and a working platform, and the working platform comprises a platform fixing baseplate, a handrail rack and a handrail door. According to the aerial work platform, not only is the linkage structure simplified, but also the steering stability and the steering synchronicity are improved; and the handrail door of the working platform is convenient to open and can effectively prevent accidental looseness, so that the security of the working platform is high.

The invention discloses a jacketed type corrugated pipe compensator which comprises an inner compensator body, an outer compensator body, ring plates and a lug plate, wherein the inner compensator body and the outer compensator body are coaxially sleeved with each other, and the inner compensator body and the outer compensator body are positioned and connected through the ring plates and the lug plate; the inner compensator body comprises an inner corrugated pipe and an inner pipe opening, the two ends of an inner middle connecting pipe are coaxially and sequentially connected with the inner corrugated pipe and the inner pipe opening in a sealing mode respectively, and the inner wall of the inner corrugated pipe is fixedly connected with a flow guide pipe in the medium flow direction; the outer compensator body comprises an outer corrugated pipe and an outer pipe opening, and the two ends of an outer middle connecting pipe are coaxially and sequentially connected with the outer corrugated pipe and the outer pipe opening in a sealing mode respectively; a pull rod penetrates through through holes uniformly distributed in the end faces of the ring plates and the end face of the lug plate, the two exposed ends of the pull rod are locked by means of nuts, and a direct movement tensile structure that the inner compensator body and the outer compensator body are oriented through the through holes of the lug plate is formed. The corrugated pipe compensator is of a jacketed type structure, on the basis that axial compensation is not influenced, the aim of carrying out heat preservation on or heating medium steam in the inner compensator body is achieved by means of heat provided by heat media during circulation inside a jacket, and it is guaranteed that production is conducted in order.

The invention discloses a traveling chassis with a high-stability traveling steering function. The traveling chassis is characterized by comprising a chassis, a traveling device and a support leg structure, wherein the traveling device comprises a left steering wheel, a right steering wheel, a left wheel frame, a right wheel frame, a linkage frame, a steering cylinder and steering bent plates, and the left steering wheel and the right steering wheel are rotationally mounted on the left wheel frame and the right wheel frame respectively and are driven respectively through a left driving motor which is fixedly arranged on the left wheel frame and a right driving motor which is fixedly arranged on the right wheel frame. According to the traveling chassis, the steering cylinder is a double-rod hydraulic cylinder, so that the linkage structure is simplified, and the stability and synchronism of a steering process are improved; depressions are formed in the steering bent plates, so that the steering bent plates can be closer to a wheel frame axle, thus, the angle limit of steering can be increased, and use performance is enhanced.

The invention discloses a switch cabinet drawer. The switch cabinet drawer comprises a drawer bin; a drawer is arranged in the drawer bin in a sliding manner; a drawer panel is provided with an operation knob used for controlling the on-off of a component in the drawer; a mounting seat is arranged in the drawer; an interlocking mechanism which rotates along with the operation knob to limit the sliding of the drawer is arranged on the mounting seat; and a display mechanism which displays the state positions of the drawer according to the movement of the drawer is arranged on the mounting seat.The switch cabinet drawer can satisfy use requirements when being in three state positions; the switch cabinet drawer is simple in structure and is convenient to process and product; and the overallstructure of the display mechanism is more stable.

The invention relates to a linkage device for a turnover type humidifier. The linkage device comprises a humidification device, wherein a left partition is arranged on one side in the humidification module, and a right partition is arranged on the other side in the humidification module; a wet film assembly is arranged between the left partition and the right partition; one end of the wet film assembly is arranged on the left partition in a penetrating manner, and the other end of the wet film assembly is arranged on the right partition in a penetrating manner, and a transmission gear is arranged at the other end of the wet film assembly in a sleeving manner; a pipe cavity is formed between the left partition and the humidification module; an element cavity is formed between the right partition and the humidification module; a water feeding pipe is arranged in the pipe cavity; the water feeding pipe is connected with one end of the wet film assembly in a rotatable manner through a rotating pipe sleeve; a fixed seat is arranged on the upper side in the element cavity; a synchronous motor is arranged on the fixed seat; and the synchronous motor is connected with the transmission gear. The invention aims at providing the linkage device for the turnover type humidifier, which is convenient for water feeding, can prevent and resist wind, is small in size and can rotate.

The invention discloses a needle bed device of a flat knitting machine and the flat knitting machine, and belongs to the technical field of flat knitting machines. The needle bed device comprises needle beds and inserting pieces, needle grooves are formed between the adjacent inserting pieces, lower knitting needles and lower needle jack pins are arranged in the needle grooves, conversion needle pins are arranged between the lower knitting needles and the lower needle jack pins, partition plates are further arranged in the needle grooves, upper knitting needles are arranged at the tops of thepartition plates, the rear ends of the upper knitting needles are connected with upper needle jack pins, push pieces are arranged at the bottoms of the upper needle jack pins, transition needle pins are arranged at the bottoms of the push pieces, the front ends of the conversion needle pins can be matched with the lower knitting needles or the transition needle pins, the lower needle jack pins candrive the lower knitting needles to move front and back through the conversion needle pins, and the lower needle jack pins can further drive the upper needle jack pins to swing upwards through the conversion needle pins, the transition needle pins and the push pieces. The number of the needle beds does not need to be increased, and assembly requirement of the needle bed device is reduced. The switching of the operation of the upper knitting needles and the lower knitting needles can be realized through the matching of the conversion needle pins, the transition needle pins and the push pieces,and the structure of the needle bed device is favorably simplified.

The invention discloses a turning processing clamp used for an outer threaded joint of a water-resisting guide tube. The turning processing clamp consists of a three-claw self-centring chuck, inner claws and bolts, wherein the outer end surfaces of clamping claws of the three-claw self-centring chuck are planes, and the three clamping claws which are uniformly distributed are on the same plane, and the plane is perpendicular to the axis; each inner claw is a specially shaped part, and is formed by superposing a rectangular bottom plate and a circular-arc-shaped lug boss which is bent inwards;two through holes are formed in the bottom plate of the top of each circular-arc-shaped lug boss; and the inner claw of each clamping claw is used for positioning and connecting through the bolt, so that a self-centring circular inner expansion structure in which the inner claw rotates along with the clamping claw is formed. The structure is uniform in stress distribution while internally expanded, greatly reduces workpiece deformation, remarkably strengthens rigidity during workpiece clamping, and facilitates increasing turning amount, so that turning efficiency and turning quality are remarkably improved.

The invention discloses a guiding type corrugated limiter which is composed of a cover plate, corrugated tubes, a guiding sleeve, a base plate and a core shaft. The guiding sleeve is a thin wall shaft sleeve internally provided with a circular bead, a notch is formed in the opening portion of the right end of the guiding sleeve, the corrugated tubes are arranged outside the centered guiding sleeve, and the core shaft is arranged in the guiding sleeve in a clearance fit mode. The cover plate is respectively connected with the left end face of the guiding sleeve and the left end faces of the corrugated tubes in a sealed mode, and the base plate is installed on the core shaft in a sleeved mode, abuts against the right end face of the guiding sleeve, and is respectively connected with the right ends of the corrugated tubes and the core shaft in a sealed mode to form a linkage structure. The circular bead arranged in the guiding sleeve is of the structure that concave portions and convex portions are alternatively arranged on the same circumference, the shape of the cross section of the large end face of the core shaft is the same as the shape of the circular bead arranged in the guiding sleeve, and the core shaft is in clearance fit with the guiding sleeve to form an anti-torque structure for straight going of the core shaft. The waveform axial sections of the corrugated tubes in the guiding type corrugated limiter are in omega shapes, the tube walls of the corrugated tubes are smooth, thick, reasonable in stress and even in elastic deformation, limitation is accurate, and the corrugated tubes are particularly suitable for working under the high-temperature and high-pressure working conditions.

The invention discloses a shear fork type aloft work platform with a high-stability driving and steering function. The shear fork type aloft work platform is characterized by comprising a driving chassis and a lifting device; the driving chassis comprises a chassis body, a driving device and a supporting leg structure; the lifting device comprises a shear fork type lifting structure and a working platform; the shear fork type lifting structure comprises an upper shear fork unit, a lower shear fork unit and a lifting oil cylinder. Through the small-width upper shear fork unit, on the premise of ensuring the lifting height, by decreasing the thickness of the upper shear fork unit, the weight borne by the lifting hydraulic cylinder is reduced, and the efficiency and safety of the device are improved; through the large-width lower shear fork unit, the supporting stability is ensured; the stability and synchronism of the steering process are improved; by forming pits in a steering bent plate, the steering bent plate can be closer to a wheel carrier shaft, and therefore the steering angle limit can be improved, and the use performance is enhanced.

A draggable type portable bicycle provided with a telescopic handle and a bottom bracket serving as a rotating shaft comprises the telescopic rotating handle, a front fork lever, a front frame, a middle beam, a middle connecting component, a dragging wheel assembly, a rear fork part, a saddle, a front wheel, a rear wheel and a driving mechanism, wherein the telescopic rotating handle is connected with the front fork lever and the front frame and comprises a left handle, a right handle, an upper locking part, a lower locking part and a pull handle; the front frame comprises a rotating component and a front connecting component; the middle beam is formed by connecting a beam tube, a front inner brake shoe, a rear inner brake shoe, a front slotware and a rear slotware; the middle connecting component is formed by connecting a main connecting part, a suspension block and a positioning lock; the rear fork part is formed by connecting the bottom bracket, two bottom bracket connecting parts, a suspension block piece and two rear fork pieces; the saddle is formed by a seat tube, a locking joint part, a connecting rod, a saddle body and a foldable positioning hook; the front wheel is mounted on a front axle, the rear wheel is mounted on the rear fork part, and the driving mechanism comprises a center shaft, two cranks, a crankset, two pedals, a flywheel and a chain and is connected to the bottom bracket and the rear wheel.

The invention discloses a multi-lock-cylinder linkage electronic lock. The multi-lock-cylinder linkage electronic lock comprises an electronic drive mechanism, a linkage mechanism, a main linkage lockcylinder and an auxiliary linkage lock cylinder. The linkage mechanism comprises a main lock linkage plate, an auxiliary lock linkage plate and an ascending and descending linkage rod. The main linkage lock cylinder comprises a first horizontal movement spring bolt fixedly provided with a first horizontal movement guide column. A first horizontal movement sliding groove is obliquely formed in themain lock linkage plate, and the main lock linkage plate has the elastic potential energy to move to the locking end of the first horizontal movement spring bolt. The auxiliary linkage lock cylindercomprises a second horizontal movement spring bolt fixedly provided with a second horizontal movement guide column, a second horizontal movement sliding groove is obliquely formed in the auxiliary lock linkage plate, and the second horizontal movement guide column is located in the second horizontal movement sliding groove. The multi-lock-cylinder linkage electronic lock is provided with a simplelinkage structure, and when an inner chip of the electronic lock breaks down, a mechanical key can be used for unlocking, and locking can be automatically conducted.

The invention relates to a high-stability aerial work platform driving chassis which comprises a chassis body, a driving device, a pit protection mechanism and a support leg structure. The driving device comprises a left steering wheel, a right steering wheel, a left wheel frame, a right wheel frame, a linkage frame, a steering cylinder and a steering bend plate; the pit protection mechanism comprises a left pit plate, a right pit plate, two first pit connecting plates, two second pit connecting plates, two third pit connecting plates, a fourth pit connecting plate, two movable seats, two guide shafts, two limit plates and two movable seat press springs; the support leg structure comprises a frame plate, a support leg plate, a support leg mounting plate, an outer support pipe, an inner support pipe and a support leg. By the above structure, the pit plates can rotate flexibly to meet requirements of different states, throughout performance is improved, steering angle limit can be increased, and use performance is enhanced.

The invention discloses a square pipe end opening inner side wall grinding machine tool, and belongs to the field of pipe machining. The square pipe end opening inner side wall grinding machine tool comprises a propelling square frame. Two vertical guide rails are arranged on the side wall of the propelling square frame. A carrying guide rail is fixedly arranged at the bottom ends of the vertical guide rails. The vertical guide rails and the carrying guide rail are perpendicular to each other. Vertical sliding blocks are arranged on the vertical guide rails and are in sliding connection with the vertical guide rails. The carrying guide rail is sleeved with a carrying sliding block. The carrying sliding block and the carrying guide rail are in sliding connection. Gear discs are arranged at the top end of a plane shaft base and are rotationally connected with the plane shaft base. The two gear discs are engaged with each other. Carrying plates are fixedly arranged on the side walls of the gear discs. Drive motors are arranged at the bottom ends of the carrying plates. Drive wheel discs are arranged at the output ends of the drive motors. The output ends of the drive motors penetrate through the side walls of the carrying plates. Rubber rings are arranged on the outer side walls of the drive wheel discs. The friction coefficient between the rubber rings on the outer sides of the drive wheel discs and the side wall of a pipe can be increased.

A telescopic-handle folding portable bicycle comprises a telescopic rotary handle, a front fork rod, a front bracket, a middle beam, a rear fork piece, a seat, a front wheel, a rear wheel and a driving mechanism, wherein the telescopic rotary handle is connected with the front fork rod and the front bracket and consists of a left handle, a right handle, an upper locking piece, a lower locking piece and a handle; the front bracket consists of a rotary part and a front connecting piece; the middle beam consists of a beam tube, a front groove piece and a rear groove piece which are connected with one another; the rear fork piece consists of a wavy curved tube, a five-way tube, a front inner plug, a rear inner plug and an n-shaped auxiliary fork which are connected with one another; the seat consists of a seat tube, a locking and connecting piece, a connecting rod, a saddle and a folding positioning hook which are connected with one another; the front wheel is mounted on a front axle; the rear wheel is mounted on the rear fork piece; the driving mechanism consists of a center axle, two cranks, a crankset, two pedals, a flywheel and a chain and is connected to the interior of the five-way tube and the rear wheel.

The invention discloses a vertical self-priming centrifugal pump self-supply water-cooling mechanical sealing structure, comprising a pump shaft seal, a pressurized-water component and a connecting pipe. The pump shaft seal is arranged above an impeller, the pressurized-water component is arranged below the impeller, the pump shaft seal and the pressurized-water component are interlocked by a transmission shaft. A shell in the pressurized-water component is a water-storage container with a bottom, the shell is internally provided with an inner ring and an outer ring in clearance fit with each other; the outer wall of the inner ring and the inner wall of the outer ring are provided with multi-head rectangular threads with the same dimension and opposite direction of turning; and the rotary inner ring and the relatively static outer ring form a pump structure. The inner ring is internally provided with a bushing served as a support in clearance fit; the bushing is matched with a built-in core shaft key, and the bottom end face of the core shaft key is connected with the shell. The two ends of the connecting pipe are respectively with a water outlet of the pressurized-water component and a water inlet of the pump shaft seal. When the pump is restarted, as the shell naturally stores water, the pressurized-water component rotating with the pump shaft outputs the stored water at first time for water-cooling of the pump shaft seal so as to avoid dry friction of a rubbing pair and greatly improve service life of a mechanical seal.

The invention discloses a closestool flushing method and device and a closestool. The closestool flushing method comprises the steps that a small water tank is arranged in a closestool water tank, when large-displacement flushing is conducted, the small water tank and the closestool water tank drain water, and water in the small water tank is drained into the closestool water tank; when small-displacement flushing is carried out, the small water tank does not drain water, and the closestool water tank drains water; and in the water inlet stage of the closestool water tank, the drained small water tank is replenished with water. The double-row toilet flushing device can be used for changing a single-row toilet flushing device into a double-row toilet flushing device and can also be used forreducing the displacement of small-displacement flushing of the double-row toilet flushing device, so that the problem of water resource waste of the toilet flushing device in the prior art is solved.

The invention discloses a grinding machine tool for grinding the inner side wall of a square pipe port, which belongs to the field of pipe material processing and comprises a propulsion frame. The side wall of the propulsion frame is provided with two vertical guide rails, and the bottom ends of the vertical guide rails are fixed. The carrying guide rail is installed, the vertical guide rail and the carrying guide rail are perpendicular to each other, and the vertical slide block is installed on the vertical guide rail, the vertical slide block and the vertical guide rail are slidably connected, the carrying slide block is set on the carrying guide rail, the carrying slide block and The carrying guide rail is slidingly connected, and the top of the plane shaft seat is provided with a gear plate, the gear plate and the plane shaft seat are rotatably connected, and the two gear plates mesh with each other, and the side wall of the gear plate is fixedly installed with a carrying plate, and the carrying plate The bottom end of the drive motor is provided with a driving wheel, the output end of the driving motor passes through the side wall of the carrying plate, and the outer wall of the driving wheel is provided with a rubber ring. The rubber ring on the outside of the driving wheel in the present invention will increase the coefficient of friction with the side wall of the pipe.

A portable electric bicycle with a telescopic rotating handlebar comprises the telescopic rotating handlebar, a front fork rod, a front frame, a middle beam, a rear fork, a saddle, a front wheel, a rear wheel and an electric driving system. The telescopic rotating handlebar is connected with the front fork rod and the front frame. The telescopic rotating handlebar is composed of a left handle, a right handle, an upper lock, a lower lock and a pull handle. The front frame is composed of a rotating part and a front connecting part. The middle beam is formed by connecting a beam pipe, a front inner plug block, a front groove part, a rear groove part, a rear inner plug block, a bicycle body folding device, two pedals and two dragging wheels. The rear fork is formed by bending a strip-shaped metal sheet into a door-frame shape. The saddle is formed by connecting a saddle pipe, a locking part, a connecting rod, a saddle body and a folding positioning hook. The front wheel is mounted on a front axle, and the rear wheel is mounted on the rear fork. The electric driving system comprises a motor, a battery, a controller and a control switch. The motor is arranged on the rear wheel, and the battery and the controller are both arranged in the beam pipe of the middle beam.

The invention provides an operating device of a surge backup protector. The operating device comprises a shell; an electromagnetic release; a push rod reset member; a handle; an operating mechanism which comprises a base frame pivoted on the shell in a resettable manner, a jump pin pivoted on the base frame and matched with the handle in a linkage manner, a lock catch pivoted on the base frame ina resettable manner and matched with the jump pin in a buckling manner, and a transmission rod pivoted on the base frame in a resettable manner, wherein a pushing part for enabling the ejector rod resetting piece to swing towards the ejector rod is arranged on one side, facing the ejector rod resetting piece, of the base frame; a static contact rod assembly which is fixedly arranged on the shell;a movable feeler lever assembly which comprises a movable feeler lever and an opening spring. According to the operating device disclosed in the invention, the base frame is linked with the movable contact rod through the resettable transmission rod, and therefore the movable contact rod is in contact fit with the static contact rod assembly; after the lock catch and the jump pin are slipped and unlocked by the electromagnetic tripper, the base frame enables the ejector rod of the electromagnetic tripper to retract to the original position through the ejector rod resetting piece.

The invention discloses a limb joint function evaluation rehabilitation training system and a using method thereof. The system comprises a rack, a rehabilitation training device and a control device, wherein the rehabilitation training device comprises a lifting mechanism, a telescopic mechanism, a rotating mechanism and a supporting mechanism. The method comprises the following steps of: 1, deducing motion parameters of an affected limb of a user in a normal state; 2, measuring the motion parameters of the affected limb of the user before rehabilitation training; 3, setting the motion parameters of the affected limb of the user in the rehabilitation training; 4, formulating a rehabilitation training scheme of the affected limb of the user; 5, performing rehabilitation training on the affected limb of the user; 6, measuring the motion parameters of the affected limb of the user after the rehabilitation training; and 7, evaluating the motion parameters of the affected limb of the user after the rehabilitation training scheme. The rehabilitation training system disclosed by the invention aims at guided rehabilitation training, can help the affected limb to recover from dysfunction, is suitable for rehabilitation of dysfunction of the affected limb of early bedridden patients due to cerebrovascular accidents and the like, and can be applied to limb rehabilitation training in various clinical stages.

The invention discloses a novel lock body which comprises a connecting structure, a handle, a lock cylinder structure and a sliding plate. The sliding plate and the handle are linked through the connecting structure. One side of a lock cylinder gear of the lock cylinder structure is in contact with the sliding plate. A straight rack is arranged on the side, close to the lock cylinder structure, ofthe sliding plate and cooperates with the lock cylinder gear. The novel lock body is simple in structure and can achieve dual-side control.

The invention provides a telescopic handle five-way pipe rotating shaft portable electric bicycle capable of being dragged comprising a telescopic rotating handle, a front fork, a front frame, a middle beam, a middle link member, a towing wheel, a rear fork, a seat, a front wheel, a rear wheel, a human power drive system and an electric drive system; the telescopic handle is connected with the front fork and the front frame; the front frame is formed by a rotary part and a front link member; the middle beam comprises a beam tube, a front inner chock, a rear inner chock, a front slot piece and a rear slot piece; the middle link member is formed by connecting a main connecting member and a shock avoiding block; the rear fork member is formed by connecting a five-way pipe, two five-way pipe connecting members, a shock avoiding stop piece and two rear fork pieces. the seat is formed by connecting a seat tube, a locking link member, a connecting rod, a saddle and a folding positioning hook; the front wheel is installed on the front fork and the rear wheel is installed on the rear fork member; the drive mechanism comprises a middle shaft, two cranks, a chain wheel, two pedals, a flywheel and a chain. the electric drive system comprises a motor, a battery, a controller and a control switch.