129results about How to "Realize deadlock" patented technology

Disclosed is a self-adaption claw mechanism of a spatial on-orbit service robot. The self-adaption claw mechanism is composed of a self-adaption claw, a motor, a transmission mechanism of the motor and a base part. The self-adaption claw is used for achieving the function of on-orbit target object capturing. The motor and the transmission mechanism of the motor are used for transmitting torque, and the motor provides active torque. The base part is used for maintaining the relative positions of all the parts of a system. The self-adaption claw mechanism has adaptivity, so that grabbing modes can be selected in a self-adaption mode according to the shapes of target objects, and the universality is strong. The claw mechanism has auto-stability, and after the claw mechanism makes contact with the target objects, the post grabbing process is prone to self-stabilization due to the fact that a torsion spring which has the effect of adjusting the torque in a passive mode is adopted. The active and passive composite driving design with the single motor and the torsion spring combined is adopted in the mechanism, so that control strategies are simplified, and impulsive loads can be effectively buffered. The self-adaption claw mechanism is applied to the on-orbit robot, and greatly improves the task executing efficiency.

The invention relates to a metal rubber damper and anti-buckling support combined energy dissipating device with limit-locking function; under small loads like wind load, the metal rubber damper can firstly enter a non-linear state and carry out elastoplasticity energy dissipation because the vibromotive force is low; when the structure bears large earthquake effect, the metal rubber damper will have large deformation; in order to prevent fast damages, when the deformation exceeds a set threshold, the damper will be locked by a locking device and limiting device, and is effectively constrained, thus only having small deformations in an assigned scope; the anti-buckling support starts to perform the energy dissipating ability; metal rubber rings are placed between inner and outer sleeves of the anti-buckling energy dissipating support at intervals so as to allow the anti-buckling energy dissipating support have fixed point yield under the large earthquake effect, thus solving the problems that a normal anti-buckling energy dissipating support cannot determine the yield positions, and a constrain unit needs mortar perfusion, thus enlarging self-weight and wasting materials, the processing process is complex, the support end can be easily damaged, and the yield force is high.

The invention provides a four-freedom-degree spherical module unit, and relates to a modular robot module unit. The four-freedom-degree spherical module unit aims to solve the problems that an existing robot module unit has fewer degrees of freedom, poor flexibility and a low space utilization rate. The four-freedom-degree spherical module unit comprises a spherical shell, a regular tetrahedron assembly and four sets of connecting assemblies, wherein the regular tetrahedron assembly comprises a regular tetrahedron support and four drive motors; each connecting assembly comprises a transmission mechanism, an outer shell and two lifting mechanisms; the regular tetrahedron support and the four connecting assemblies are disposed in the spherical shell, each drive motor is installed in a mounting base of the regular tetrahedron support, and an output shaft of each drive motor is provided with one outer shell; two driving guide rail holes and two driven guide rail holes are formed in each outer shell; each transmission mechanism is mounted on the inner side face of the corresponding outer shell and connected with the two lifting mechanisms, the driving guide rail holes are used for the lifting mechanisms of the module unit to stretch out, and the driven guide rail holes are used for receiving the lifting mechanisms of the butted module unit. The four-freedom-degree spherical module unit is used for a modular robot.

The invention belongs to the technical field of connection pieces and particularly provides an expansion bolt convenient to disassemble. The expansion bolt convenient to disassemble comprises a firstscrew cap, a first threaded rod and a first nut. The first threaded rod is fixedly installed on the bottom surface of the first screw cap and coaxial with the first screw cap. The first threaded rod is sleeved with the first nut. The bottom surface, far away from the first screw cap, of the first threaded rod is provided with a first through hole extending to the bottom surface of the first screwcap. The upper surface of the first screw cap is provided with second through holes communicating with the first through hole. A locking piece is fixedly installed on the upper surface of the first screw cap. The other end of each steel wire rope penetrates through an installation plate, the first through hole and the corresponding second through hole to be connected with the locking piece. The steel wire ropes are used for tensioning friction blocks to enable the elastic pieces to be compressed and deformed. According to the expansion bolt convenient to disassemble, through the arrangement ofthe friction blocks and the elastic pieces, the first nut is squeezed, so that locking of the bolt is achieved; a first screw is arranged to drive the steel wire ropes to move in the vertical direction so as to enable the bolt to be convenient to disassemble; and the use efficiency of the expansion bolt convenient to disassemble is improved.

The invention relates to a subsea pipeline in-situ overhaul bin. A pressing resistant shell is formed by fixedly connecting a dry-wet bin and a manned bin. An opening-closing door used for communicating with the dry-wet bin and the manned bin is arranged between one side of the dry-wet bin and the manned bin. An automatic opening-closing bin opening cover is further arranged on the other side of the dry-wet bin. A cable grabbing manipulator and a workbench are located in the automatic opening-closing bin opening cover. An electric control system used for providing electric power and a life support system are arranged in the manned bin. A replacement water tank, a replacement water pump, overhaul equipment, an underwater hydraulic pump, a valve box, a workbench and a cable grabbing manipulator are arranged in the dry-wet bin. The subsea pipeline in-situ overhaul bin adopts single-shell structure design, thus the space utilization rate of the subsea pipeline in-situ overhaul bin is high, the whole bin size is reduced under the same compression strength requirements, the carrying capacity is high, and the working depth is large. Balance of the underwater posture in the dry-wet bin is achieved through a water replacement principle, and the advantages of high bottom resting stability and wide usage performance are achieved. Through the arrangement of a pipeline seal structure, partial sealing of a submarine cable is achieved, and the submarine cable can enter the subsea pipeline in-situ overhaul bin and can be taken out of the subsea pipeline in-situ overhaul bin after an overhaul conveniently.

The invention relates to the technical field of petroleum drilling and production equipment, and provides a self-locking casing head. The self-locking casing head comprises a casing head body, wherein the casing head body is provided with a mounting hole; a hanger is arranged in the mounting hole; a sealing assembly is arranged between the hanger and the mounting hole; the casing head body is further provided with a mounting groove; the mounting groove communicates with the mounting hole; a plurality of clamping pieces are uniformly distributed at intervals in the circumferential direction of the mounting hole; the clamping pieces are provided with inverted teeth; the end of the hanger is provided with positive teeth; the inverted teeth are matched with the positive teeth; the clamping pieces are provided with vertical long-strip holes; a rotating shaft penetrates through the long-strip holes; reset elastic pieces are arranged on the clamping pieces; the upper ends of the clamping pieces are connected with the mounting groove through the reset elastic pieces; the lower ends of the clamping pieces abut against the inner wall of the bottom surface of the mounting groove; the bottom surface of a locking piece mounting groove is provided with a locking hole; a locking piece is arranged in the locking hole in a sliding mode in the vertical direction; and the clamping piece is jacked up after sliding. According to the technical scheme, the problem that an oil pipe is prone to loosening in the prior art is solved.

The invention discloses a vehicle-umbrella separating mechanism for initiating explosive release. The mechanism is mainly applied to vehicle-umbrella separating in the recovery process of a fixed-wing unmanned aerial vehicle. A piston in a cavity can be pushed to act through the chemical energy produced by explosion of an initiating explosive device, a limiting aluminum wire is cut off, a steel ball is released, and disengagement and separation of two connectors are achieved. The vehicle-umbrella separating mechanism of the unmanned aerial vehicle has the advantages of being small in size, simple in control mode and high in reliability.

The invention relates to an adaptive stair climbing and cleaning robot, in particular to an adaptive stair and corridor cleaning robot and a stair climbing method thereof. According to the adaptive stair and corridor cleaning robot, the length and the width of a laminating folding mechanism are adjustable by the aid of inclined electric telescopic rods and vertical electric telescopic rods, and accordingly, the adaptive stair climbing and cleaning robot is adaptive to stairs with different heights and different widths and has a wider application range.

The invention belongs to the field of hub brake locks, and particularly relates to a novel intelligent hub brake lock. The novel intelligent hub brake lock comprises a hub brake casing, wherein a mounting position for being mounted on an end cover of a hub is formed on the hub brake casing; a motor accommodating chamber for accommodating a motor is arranged on the hub brake casing; the motor is arranged in the motor accommodating chamber; a lock tongue slideway is also formed on the hub brake casing at one side of the motor; a lock tongue is arranged in the lock tongue slideway; a driving device is arranged between the motor and the lock tongue; a motor control device is also connected to the motor and controls the motor to rotate; the motor rotates to drive the lock tongue to slide in the lock tongue slideway through a driving device and the front end of the lock tongue is enabled to extend into the mounting position or leave from the mounting position. The novel intelligent hub brake lock disclosed by the invention has the advantages of simple structure, convenience in use, safety and reliability; a switch of the hub brake lock can be remotely controlled; and when the connection of a torsional spring is broken off, the lock tongue automatically retracts to prevent the hub brake from being locked.

The invention discloses a power generation knapsack. The power generation knapsack comprises a knapsack frame assembly, a plurality of elastic assemblies, a motion mechanism and a battery unit. The elastic assemblies are arranged on one side of the knapsack frame assembly. The motion mechanism is arranged on the elastic assemblies and moves up and down on the knapsack frame assembly through the elastic assemblies. The motion mechanism comprises a power generation box, a power generator and a battery unit. The power generation box comprises a transmission assembly and a mechanical energy storage device. The knapsack frame assembly is provided with a rack, the rack is connected with the transmission assembly, the transmission assembly is connected with the mechanical energy storage device, the mechanical energy storage device is connected with the gear end of the power generator through a transmission gear, and the power generator is further electrically connected with the battery unit.According to the power generation knapsack, in the upward and downward motion process of the motion mechanism, power generation can be achieved, and the power generation efficiency is improved by twotimes compared with existing devices.

An automatic stepping tree climbing monitoring and detecting robot comprises a mechanical leg system, sensors, a monitoring and detecting system and a rack rod assembly. When a mechanical leg driving motor conducts driving alone, complex tree climbing and holding movement can be achieved, and driving is simple. An inclined angle is formed between each mechanical leg and a tree trunk, locking can be achieved through the reaction force of the driving force, and the tree climbing and holding work is safe and reliable. In the robot tree climbing process, the holding angle can be changed by switching the freedom degree, and the robot flexibly adapts to trees with different diameters. The body structure of animals is simulated, so that the tree climbing monitoring and detecting robot flexibly adapts to trees in different shapes. The multi-freedom-degree monitoring and detecting system and the tree climbing robot are combined, the movement performance is good, the working range is wide, and the field monitoring and detecting work can be flexibly and conveniently completed. The multiple sensors feed parameters back to a controller, and the automatic tree climbing monitoring and detecting work can be achieved through programming control.

The invention discloses an anti-loosening sealing cover for a pressure vessel for an aerospace dynamic test, and relates to the technical field of sealing covers. The anti-loosening sealing cover comprises a vessel body, an inner sealing cover and an outer sealing cover; and the bottom of the inner sealing cover is in pressing connection with the top of the vessel body, the top of the periphery ofthe vessel body is fixedly connected with threaded seats, the periphery of the inner sealing cover is fixedly connected with bolt sleeves, and the bolt sleeves and the inner surfaces of the threadedseats are in threaded connection with bolts. According to the anti-loosening sealing cover for the pressure vessel for the aerospace dynamic test, the match among the bolts, the threaded seats and thebolt sleeves is arranged, so that the inner sealing cover can be pressed on the top of the vessel body for primary sealing, then the outer sealing cover is matched with external threaded sleeves foruse, so that a secondary sealing effect can be achieved, and the sealing performance is improved; and through the match between gear rings and gear caps, the outer sealing cover can synchronously drive the four bolts to rotate when being screwed, and the four bolts do not need to be manually tightened one by one, so that a large amount of time is saved, and the use is convenient.

The invention discloses anti-panic rope ascender / descender equipment. The anti-panic rope ascender / descender equipment comprises a body, a movable cam and a releasing and clamping mechanism, wherein a lockhole is formed in one end of the body, one end of the movable cam stretches into the end, deviating from the lockhole, of the body, the end of the body is hinged with the movable cam, and a first rope threading gap is formed between the end of the movable cam and the body; the releasing and clamping mechanism comprises a handle, a first friction element and a second friction element, andthe first friction element and the second friction element are arranged on the handle; one end of the handle is hinged with the end, deviating from the body, of the movable cam; and a second rope threading gap is formed between the first friction element and the second friction element. The anti-panic rope ascender / descender equipment is simple in structure, by arranging the first rope threadinggap, the second rope threading gap and the movable cam, the anti-panic rope ascender / descender equipment is smooth when a rope ascends and is locked automatically within a very short travel when the rope is loaded, and self-locking can be achieved during descending when a user instinctively clenches the handle due to panic caused by rapid falling.

The invention discloses a stepping motor cam friction mechanism. The stepping motor cam friction mechanism comprises a fixing groove and a plurality of friction guide units, wherein each friction guide unit comprises a first polished rod, a second polished rod, a first vertical plate, a second vertical plate, a connecting piece, an adjusting plate, a driving motor, a connecting block and an adjusting wheel; the first polished rod and the second polished rod are horizontally fixed in a fixing groove and are parallel to the width direction of the fixing groove; the first polished rod and the second polished rod penetrate through the first vertical plate and the second vertical plate; the first polished rod and the seconded polish rod are perpendicular to the first vertical plate and the second vertical plate; the connecting piece connects the first vertical plate and the second vertical plate; and the driving motor is fixed in the fixing groove and provided with a driving shaft, one endof the connecting block is connected with the driving shaft, the other end of the connecting block is connected with the adjusting wheel, the adjusting plate is vertically arranged and connected withthe connecting piece, an adjusting hole is formed in the adjusting plate and is in a vertical long-strip shape, and the adjusting wheel is inserted into the adjusting hole. Compared with the prior art, the stepping motor cam friction mechanism has the advantages of high positioning precision, low cost, simple structure and stable operation.

The invention discloses a tree supporting frame capable of changing the support force. The tree supporting frame comprises a fixed base, support rods and an elastic bandage; the fixed base is provided with self-locking units, the support rods are connected with the self-locking units, and each self-locking unit comprises a gear, a gear lock and a gear holder, wherein the gear lock comprises a lock piece, a compound pendulum and a suspension frame which are arranged on the gear holder; a groove is formed in the portion, located below the corresponding compound pendulum, of each gear holder, each groove is internally provided with a mode adjusting device which comprises a spring, a compound pendulum adjusting block and a pulling part, each compound pendulum is located under the corresponding compound pendulum, a notch is formed in each compound pendulum adjusting block, and each mode adjusting device is used for achieving switching of the self-locking unit between an automatic locking mode and an active locking mode; the fixed base is formed by splicing four splicing pieces. Accordingly, in the using process, diameter variations of trees can be adapted automatically according to growth of the trees, and meanwhile the reinforcing function can be achieved for the trees.

The invention discloses a variable-damping flexibly-driven exoskeleton joint. The variable-damping flexibly-driven exoskeleton joint comprises a crank-slider series elastic driver, an exoskeleton joint shell and a magnetorheological damper, two joint rolling bearings are placed in the exoskeleton joint shell and used for supporting a joint center rotating body in the crank sliding block series connection elastic driver, other rod pieces or joints are connected through joint connecting pieces, and elastic elements are connected with the exoskeleton joint shell and the joint center rotating body respectively. A first magneto-rheological damper connecting block in the magneto-rheological damper is connected with an exoskeleton joint shell, a second magneto-rheological damper connecting block in the magneto-rheological damper is connected with a joint center rotating body, and the crank sliding block is connected with the elastic driver in series, and the magneto-rheological damper and the elastic element are connected in parallel. According to the invention, the mechanism can realize flexible driving and can resist external impact, so that the wearing comfort of the exoskeleton is improved.

The invention discloses an automatic industrial washing machine door sealing device which comprises a machine door body. A first fixing block is welded on one side of the machine door body, a first installing hole is formed in the first fixing block, a rotary shaft is rotatably installed in the first installing hole, a door body fixing rack is welded on the rotary shaft, a door body buffer rack is installed in the door body fixing rack in a sliding mode and is matched with the door body fixing rack, multiple rubber air bags are welded on the inner wall of the bottom of the door body fixing rack in an equal distance mode, multiple second installing holes are formed in the door body buffer rack, rubber air bags are installed in the second installing holes in a sliding mode, and the second installing holes are matched with the rubber air bags. The automatic industrial washing machine door sealing device is simple in structural principle, and an air spring air cylinder pushes a first clamping column to be clamped into a first clamping groove so as to achieve a machine door locking effect. The rubber air bag pushes the door body buffer rack and extrudes a machine door, so that a machine door periphery seal ring is matched with the machine door body in a sealed mode, and a comprehensive machine door sealing effect is achieved.

The invention relates to the technical field of casting shakeout, and discloses a casting sand removing line which comprises a hammering mechanism, a sand shaking mechanism and a sand conveying mechanism, the hammering mechanism and the sand shaking mechanism are connected to the ground, and the sand conveying mechanism passes through the lower portion of the hammering mechanism and the lower portion of the sand shaking mechanism. And the shakeout receiving mechanism is used for receiving shakeout from the hammering mechanism and the sand shaking mechanism. According to the sand core removing device, automatic workpiece sand core removing work is achieved, and the working efficiency is improved.

The invention relates to the technical field of the relay, more particularly to an improved moving-reed relay comprising a housing, an electromagnet assembly installed in the housing, a push member installed in the housing, and a contact assembly installed in the housing. The contact assembly consists of a static reed and a moving reed that are installed in the housing; and a static contact and amoving contact are arranged at the static reed and the moving reed respectively. One end of the push member is connected with the moving reed and the other end of the push member is connected with theelectromagnet assembly; and the electromagnet assembly drives the push member to move back and forth to drive the moving reed to move back and forth, so that connection or disconnected of the movingcontact and the static contact is realized by the moving reed moving back and forth. Besides, a sliding cavity for sliding of the push member is formed in the housing; an abutting protrusion abutted against the side of the push member is arranged on the wall of the sliding cavity; and the push member is provided with an oblique sliding surface abutted against the abutting protrusion. The improvedmoving-reed relay has advantages of simple and compact structure and low manufacturing cost; and problems that closing can not be realized and rebounding occurs are solved.

The invention relates to a metal rubber damper and anti-buckling support combined energy dissipating device with limit-locking function; under small loads like wind load, the metal rubber damper can firstly enter a non-linear state and carry out elastoplasticity energy dissipation because the vibromotive force is low; when the structure bears large earthquake effect, the metal rubber damper will have large deformation; in order to prevent fast damages, when the deformation exceeds a set threshold, the damper will be locked by a locking device and limiting device, and is effectively constrained, thus only having small deformations in an assigned scope; the anti-buckling support starts to perform the energy dissipating ability; metal rubber rings are placed between inner and outer sleeves of the anti-buckling energy dissipating support at intervals so as to allow the anti-buckling energy dissipating support have fixed point yield under the large earthquake effect, thus solving the problems that a normal anti-buckling energy dissipating support cannot determine the yield positions, and a constrain unit needs mortar perfusion, thus enlarging self-weight and wasting materials, the processing process is complex, the support end can be easily damaged, and the yield force is high.

The invention relates to a hydraulic turnover side-sway elevator. The hydraulic turnover side-sway elevator comprises an elevator main body, a side-sway mechanism and a turnover mechanism, wherein rotatable rotary shafts are arranged at the left side and the right side of the elevator main body; a hinge and a blocking hinge are correspondingly arranged on the two rotary shafts separately; a hingedrive structure comprises a hinge opening-closing oil cylinder and an opening-closing oil cylinder fixing base; a blocking hinge drive structure comprises a blocking hinge locking oil cylinder and a locking oil cylinder fixing base; the opening-closing oil cylinder fixing base and the locking oil cylinder fixing base are arranged on the rear side wall of the elevator main body; the cylinder barrelpart of the hinge opening-closing oil cylinder is hinged on the opening-closing oil cylinder fixing base; the piston part of the hinge opening-closing oil cylinder is hinged with the hinge; the cylinder barrel part of the blocking hinge locking oil cylinder is hinged on the locking oil cylinder fixing base; and the piston part of the blocking hinge locking oil cylinder is hinged with the blockinghinge. The hydraulic turnover side-sway elevator can effectively solve the problems that a mechanical elevator which is mostly manually operated on the market is great in working strength, is low inworking efficiency and is great in potential safety hazards.

The invention provides a vehicle type rear axle and leaf spring subpackaging tool. The vehicle type rear axle and leaf spring subpackaging tool comprises a base, a fixed supporting piece, a first movable supporting piece, a second movable supporting piece, a third movable supporting piece and a fourth movable supporting piece, and further comprises a motor, four collinearly-arranged lead screws and the connecting blocks connected between every two adjacent lead screws. A motor shaft of the motor is connected with one ends of the lead screws located at a straight end, the cylindrical containingcavities used for containing the ends of every two adjacent lead screws are formed at the two ends of the connecting block, and an annular sliding groove is coaxially fixed in the cylindrical accommodating cavity; an abutting plate is further fixed to each lead screw, a sliding block capable of sliding in the sliding groove is arranged at the end of the abutting plate, and three sets of through grooves communicating with the cylindrical containing cavity are further formed on the connecting block. The distance between every two adjacent through grooves is the same as the width of the slidingblock, and the limiting plates can be inserted into the through grooves towards the upper cylindrical containing cavity. The vehicle type rear axle and leaf spring subpackaging tool can subpackage various vehicle type rear axles and leaf springs, is simple in structure and lower in processing cost.

A hydraulic drive stepping type metamorphic tree-climbing robot comprises a hydraulic drive mechanical leg system and a rack rod assembly. The hydraulic drive mechanical leg system comprises a first hydraulic drive mechanical leg system, a second hydraulic drive mechanical leg system, a third hydraulic drive mechanical leg system and a fourth hydraulic drive mechanical leg system. When mechanical leg hydraulic driving motors conduct separate drive, complex tree-climbing and tree-holding movement can be achieved, and drive is easy; the oblique angles exist between the mechanical legs and a trunk, dead lock can be achieved through counter acting force of driving force, and tree-climbing work is safe and reliable; in the tree-climbing process of the robot, the tightly-holding angle can be changed by converting the degree of freedom, and thus the effect that the robot is flexibly adaptable to changing of the diameters of trees is achieved; by simulating the structure of an animal body, the tree-climbing robot is flexibly adaptable to the trees of different shapes; and through hydraulic drive, noise is small, movement transmitting is steady, force or moment of force is liable to obtain, and the power weight ratio is large.

The invention proposes a Mira separation structure model for air automotive aerodynamics research. The Mira separation structure model comprises a main body, a tail cover, an intermediate plate and abottom plate, wherein the main body is an automotive body model framework, a front half part of the main body is an engine cabin and driver cabin, the engine cabin and the driver cabin both are cavities, a passenger cabin and a rear compartment position of a rear half part of the main body are cavities, the intermediate plate, the bottom plate and the main body are spliced to seal the cavity, a mortise is arranged on a back surface of a front row part of the passenger cabin, the tail cover is arranged on the intermediate plate, a tenon is arranged at a front end of the tail cover and is inserted into the mortise on the back surface of the front row part of the passenger cabin, an outer surface is flush after an edge of a lower end of the tail cover is spliced with a rear half part framework of the main body, and a plurality of pressure measurement holes are formed in each surface of the automotive body. By the model, the model weight is greatly reduced, and carrying and adjustment arefacilitated; and meanwhile, a measurement device is also convenient to install in the model, turbulent flow caused by an external measurement device to intervene experiment data can be prevented, thetail cover can be replaced, and comparison research is performed.

An anti-misoperation structure for an ignition switch comprises a transmission rod which is linked with an ignition lock core of the automobile ignition switch and a shell; an electromagnetic valve is also installed on the shell, the electromagnetic valve is connected with main control unit through a circuit, a retractable push rod is arranged inside the electromagnetic valve, and the push rod extends into an inner cavity of the shell through a hole on the shell; and the transmission rod is provided with a groove which is matched with the push rod, when an automobile transmission case gear stays at a neutral gear state, the main control unit inputs a signal to the electromagnetic valve, the electromagnetic valve is conducted, the push rod is retracted under the effect of a magnetic field force, and the push rod is separated from the groove. Due to adopting the anti-misoperation structure for the ignition switch, the problems that the service life of an engine is influenced by easiness of the ignition switch on a non-corresponding gear caused by misoperation in the advancing process of a car can be solved, simultaneously the safety of the car can be improved, simpleness in structure is realized, and the anti-misoperation structure can be widely applied to the field of the ignition switch.

The invention discloses a small bone saw for joint surgery and belongs to the field of joint surgery devices. The small bone saw for joint surgery comprises a handheld arm, a power box is fixedly connected to the handheld arm, a long arm rod is connected to the power box in an inserted mode, an electric push rod matched with the long arm rod is fixedly connected to an interior of the power box, one end, away from the power box, of the long arm rod is fixedly connected with a movable joint, the movable joint is connected with a movable rod, one end, away from the movable joint, of the movable rod is fixedly connected with a working end table, the working end table comprises a shell, a mounting hole is formed in the shell, a hollow rotating shaft is rotationally connected into the mounting hole, a circular sawtooth blade is fixedly connected to the hollow rotating shaft, an induced draft fan is arranged in a rotating column, and a corrugated air guide pipe is connected between the induced draft fan and the hollow rotating shaft. Grinding and cutting can be carried out according to needs in an operation process. The small bone saw for joint surgery can be easily adapted to different use environments. By locking and fixing the movable rod and the corrugated air guide pipe, stability of a working end during working is guaranteed.

The invention discloses a novel self-locking tree support. The novel self-locking tree support comprises a fixing base, supporting rods, adjusting rods and an elastic binding band; a plurality of supporting pieces are uniformly arranged on the elastic binding band, a sliding way is formed in each supporting rod, and the fixing base is of an annulus structure; the top and the bottom of each supporting rod are connected with a bolt hole in the corresponding supporting piece and a bolt hole in the fixing base, a self-locking unit is arranged at the bottom of each adjusting rod, each self-locking unit comprises a gear, a gear lock and a gear holder, wherein the gear is rotationally arranged on the gear holder, the gear lock comprises a locking plate, a physical pendulum and a suspension bracket, the locking plate, the physical pendulum and the suspension bracket are arranged on the gear holder, the locking plate is rotationally connected with the suspension bracket, a groove is formed in the lower surface of the locking plate, a top plate is rotationally arranged on the suspension bracket, and one oblique plane is arranged on the side, away from the suspension bracket, of the upper surface of the top plate. When used, the novel self-locking tree support can be automatically suitable for the changes of the diameter of a tree according to the growth of the tree, and meanwhile, a strengthening effect on the tree can be achieved.