30results about How to "Achieve self-balancing" patented technology

The present invention provides a true triaxial loading mechanism for simulating the dynamics of ultra-deep drilling cores, comprising a reaction loading frame, a first principal stress loading assembly, a second principal stress loading assembly and a third principal stress loading assembly, wherein a high-pressure fluid loading chamber extending along the third principal stress direction is constructed inside the reaction loading frame, and a core sample is arranged in the high-pressure fluid loading chamber, wherein the first principal stress loading assembly, the second principal stress loading assembly and the third principal stress loading assembly provide principal stress loading for the core sample in three principal stress directions, and the third principal stress loading assembly is integrated in the reaction loading frame, and the third principal stress loading assembly blocks the high-pressure fluid loading chamber, so that the high-pressure fluid loading chamber is formed into an ultra-high pressure chamber. The present invention can simulate the dynamic true triaxial loading conditions of ultra-deep drilling cores in deep geological environments during the true triaxial loading process of the core sample, so as to obtain stress-strain information of the dynamic disturbance full destruction process.

The present invention discloses a grid-based intelligent inspection method and system for electric power drones, including: selecting pole towers that need to be spliced ​​for routes within a certain set coverage range of a machine nest; determining the inspection order of each pole tower with the goal of shortest drone flight path; determining the head and tail waypoints of the drone from the machine nest to the inspection pole tower, or from the previous inspection pole tower to the next inspection pole tower, or from the inspection pole tower to the machine nest; determining the altitude between the head and tail waypoints, and determining the flight strategy between the machine nest and the pole tower and between two pole towers based on the altitude; based on the inspection order of each pole tower and the flight strategy, a total route for drone inspection is obtained. The present invention determines the inspection order and flight strategy of the pole towers with the goal of shortest inspection distance, splices drone inspections into a total route for single-flight inspections of more than two pole towers, avoids waste of resources with the optimal inspection order, and improves inspection efficiency.

The application discloses a kind of without heating regeneration carbon dioxide normal temperature removal process and system, belong to natural gas decarburization field;A kind of without heating regeneration carbon dioxide normal temperature removal process, comprising the following steps:S1, raw material gas pretreatment;S2, CO2 absorption;S3, rich liquid flash evaporation;S4, lean liquid regeneration;S5, material circulation;The application is effectively solved by the absorption part of being set, the pain point that edge filler reaction is not sufficient, the low life of central filler;Can shake and scatter adhesion filler ball, clean filter hole impurity, avoid filter hole blockage, further improve gas-liquid mass transfer efficiency;Can buffer knock impact force, prevent that filler plate is damaged;Can effectively protect electric telescopic rod, and maintenance is convenient, need not to disassemble whole tower body, shorten maintenance cycle, guarantee production continuity;Can avoid liquid flooding, channeling phenomenon.

The present application provides a system for the comprehensive treatment of restaurant kitchen waste and kitchen waste, a method for the comprehensive treatment of restaurant kitchen waste and kitchen waste, and applications; the system and method can not only reduce or even eliminate the use of external carbon sources, efficiently utilize organic matter in biogas residues, increase the degradation rate of cellulose and hemicellulose in kitchen waste, increase the system's methane and hydrogen production, achieve self-balance of system heat, but also adjust the carbon-nitrogen ratio of the collaborative anaerobic digestion system, making the entire system more stable and efficient.

The invention belongs to the technical field of superconducting coil winding devices, and discloses a three-axis vector superconducting coil winding device for physical property measurement under extreme conditions, which comprises an integral coil frame, and a penetrating cold hole is formed in the center of at least one of the X-axis direction, the Y-axis direction and the Z-axis direction of the integral coil frame. Coil component mounting grooves are symmetrically formed in the connecting positions of the surface of the integral coil frame and the two ends of the penetrating type cold hole, and superconducting coil components are arranged in the coil component mounting grooves. The superconducting coil component comprises a superconducting coil arranged at the center of the coil component mounting groove, and a superconducting coil copper sheath is arranged on the surface of the superconducting coil. The three-axis orthogonal axial magnetic field vectors are superposed to realize the magnetic field vector in any direction and with the required size in the three-dimensional space, so that the experiment mode that the sample is fixed and the magnetic field angle is rotated is realized, a complex mechanical sample transmission mechanism is removed, the thermal load of the sample is effectively reduced, and the sample can reach a lower experiment temperature.

The utility model discloses a large tonnage self -balancing steel -concrete structure pre -stressed prestress tension crossbeam belongs to building construction technical field, has solved the problem of the present pre -stressed steel -concrete prestressed steel beam because of the oil cylinder and the jack is bigger, and the steel quantity is high, makes the area of production occupies the ground. The utility model discloses two tensioning plates of opposite setting, two tensioning plate bottom fixed on the bottom plate, two tensioning plate both ends are equipped with side edge reinforcing plate respectively, and the bottom of side edge reinforcing plate is fixedly connected with the bottom plate, and a plurality of tensioning holes corresponding are equipped on two tensioning plates, and tensioning pipe is equipped between the tensioning hole corresponding, and a plurality of ground anchors are equipped on the bottom plate, and the ground anchor is fixed with the pouring pool ground. The utility model discloses simple structure, stable operation can be set up flexibly according to the need of the scene, effectively reduces the original pre -stressed steel -concrete prestressed steel beam production area, improves the performance of steel -concrete prestressed steel beam simultaneously, has very strong popularization.

This utility model discloses a wire storage device for over-release protection of floating stranded wire, including a base, a floating arm hinged to the base, a guide wheel assembly installed at the free end of the floating arm, and a constant force mechanism acting on the floating arm. The guide wheel assembly is arranged on the wire path between the wire feeding wheel and the tensioner of the stranding machine. The floating arm can swing around the hinge axis according to the change of wire tension, and the temporary storage and release of wire is realized by the rise and fall of the swing path. This utility model solves the problem of wire slack accumulation and delamination caused by inertial over-release in passive wire feeding by using a floating arm-type wire storage mechanism and a double guide wheel spatial limiting structure, and realizes the self-adjustment and stabilization of stranded wire tension.

The invention discloses a climbing cone shear bearing capacity test device and test method, and belongs to the technical field of structure detection tests. The device comprises a test component structure, a pressurizing device and a self-balancing connecting device. The self-balancing connecting device comprises a connecting seat, a pull rod and a rear anchor beam, the connecting seat is arranged on the upper surface of the test component structure, the rear anchor beam is arranged on the upper surface of the connecting seat, and the arrangement direction is perpendicular to the length direction of the connecting seat. The lower end of the pull rod is pre-embedded in the test member structure, and the upper end passes through the rear anchor beam and then is connected with the rear anchor beam through a fixing member. The pressurizing device comprises a connecting rod, a lifting device and a pressurizing seat. The lower end of the connecting rod is fixedly connected with the test member structure. And the pressurizing seat is fixed on the upper surface of the connecting seat and is parallel to the rear anchor beam. The upper end of the connecting rod sequentially penetrates through the pressurizing base and the lifting device and then is fixedly connected with the lifting device through a fixing piece. When the lifting device provides upward shearing force for the test component structure below, the force is dispersed through the self-balancing connecting device, and self-balancing is achieved.

The utility model discloses a self-balancing wind-resistant portal frame which comprises stand columns, foundation feet and a top frame, clamping grooves are formed in the outer surfaces of the stand columns in an arrayed mode, a fixed threaded cylinder is connected to the center of the outer wall of a connecting block in an embedded mode, and a mounting plate is arranged on the side, away from a cross beam, of the connecting block. A rotating threaded rod is connected to the center of the side, close to the connecting block, of the mounting plate through a bearing, ejector rods are arranged around the rotating threaded rod, a fixing rod is connected to the top end of the center of the cross beam, a pull rope is connected to the bottom end of the fixing rod, and a wind stabilizing ball is connected to the end, away from the fixing rod, of the pull rope. The top rod is embedded in the clamping groove to achieve fixation of the top frame and the stand column, during installation, the rotary threaded rod can be driven to rotate by twisting the adjusting rotary disc so as to drive the installation plate to translate, the installation plate moves to drive the top rod to be embedded in the clamping groove so as to complete fixed installation of the door frame, and the stress direction of the door frame is changed through the wind stabilizing ball; and the portal is always in a stable state.

The application provides a double-suction centrifugal pump with a built-in driving mechanism, and belongs to the field of fluid delivery and special motor combination. The application comprises a split pump shell, an impeller, a pump shaft and a built-in driving mechanism. The pump shaft is fixed inside the pump shell, and two impellers are symmetrically sleeved on the pump shaft and can rotate around the pump shaft. The built-in driving mechanism is an axial flux motor structure, comprising a magnet and an induction coil. The induction coil is fixed on the pump shaft and located between the two impellers, and the magnet is embedded in each of the two impellers. A rotating alternating magnetic field is generated by electrifying the induction coil, which drives the impellers with the magnets on both sides to rotate synchronously around the stationary pump shaft, so as to realize the delivery of fluid. The application realizes the self-balancing of axial magnetic force, significantly reduces the axial load of the water-lubricated bearing, and prolongs the service life of the bearing and the whole machine.

The present invention belongs to the technical field of fluid blocking test, and specifically relates to a compound damping check valve fluid blocking test system and a test method thereof. The present invention includes a first burst pipe simulation component and a second burst pipe simulation component, the inlet of the first burst pipe simulation component is connected to the valve body inlet of the angle damping check valve, the valve body outlet of the angle damping check valve is connected to the outlet of the accumulator through the switch valve SV6, and the inlet of the accumulator is respectively arranged with a gas branch and a liquid branch; the inlet of the second burst pipe simulation component is connected to the valve body inlet of the straight-through damping check valve, and the valve body outlet of the straight-through damping check valve is connected to the outlet of the accumulator through the switch valve SV7; the pressure regulating chamber of the second burst pipe simulation component is connected to the gas source through the switch valve SV2 and the regulating valve CV2 in sequence. The present invention can simultaneously achieve the online test effects of the diagonal damping check valve and the straight-through damping check valve under the same working conditions, and the test data calculation accuracy is higher.

The present invention belongs to the technical field of superconducting coil winding devices, and discloses a three-axis vector superconducting coil winding device for measuring physical properties under extreme conditions, comprising an integral coil frame, wherein a through-type cold hole is arranged at the center of at least one direction of the X-axis, Y-axis, and Z-axis directions of the integral coil frame, and coil component mounting grooves are symmetrically arranged at the connection between the surface of the integral coil frame and the two ends of the through-type cold hole, and a superconducting coil component is arranged inside the coil component mounting groove; the superconducting coil component comprises a superconducting coil arranged at the center of the coil component mounting groove, and a superconducting coil copper sheath is arranged on the surface of the superconducting coil. The magnetic field vector of any direction and required size in three-dimensional space is realized by superposition of three-axis orthogonal axial magnetic field vectors, and an experimental method in which the sample is not moved and the magnetic field angle rotates is realized, and the complex mechanical sample transmission mechanism is removed, and the heat load of the sample is effectively reduced, so that the sample can reach a lower experimental temperature.

This invention relates to a self-balancing multistage pump with axial force, solving the problems of high energy consumption, short lifespan, and poor operational stability caused by the large axial force generated by the equal outer diameter of the front and rear cover plates and a specific speed (ns>300) in existing technologies. The technical solution includes a pump body, an impeller string housed within the pump body, and several sets of impeller units within the impeller string. The key feature is that each impeller unit includes a guide shroud, an impeller housed in the guide cavity of the guide shroud, and the impeller comprising a front cover plate, a rear cover plate, and blades disposed between the front and rear cover plates. The outer diameter of the front cover plate is larger than that of the rear cover plate. The front cover plate mates with the bottom of the guide cavity and with the open portion of the guide cavity. Its effects are: by using an impeller with a front cover plate area larger than the rear cover plate area, and in conjunction with the guide shroud, self-balancing of the impeller axial force is achieved, making the pump operation more stable and reliable, significantly reducing power consumption, greatly improving social and economic benefits, and achieving the goal of energy conservation and emission reduction.

The present invention relates to the technical field of maintenance equipment, and in particular to a quick-installation chimney maintenance equipment, comprising a chimney maintenance platform arranged in a chimney and a lifting device arranged on the chimney and used for lifting the chimney maintenance platform along the axial direction of the chimney; the chimney maintenance platform comprises a basic platform, a rotating platform, a telescopic platform and a gravity center self-balancing device, the rotating platform is rotatably arranged on the basic platform, a first driving mechanism is arranged between the rotating platform and the basic platform, the first driving mechanism is used to drive the rotating platform to rotate on the basic platform, the telescopic platform and the gravity center self-balancing device are both arranged on the rotating platform, so as to realize the rapid assembly of the chimney maintenance equipment inside the chimney, and at the same time, all maintenance inside the chimney can be realized in one lifting, the telescopic platform and the gravity center self-balancing device are controlled by a control mechanism to relatively displace along the radial direction of the chimney and approach or move away, so as to realize the self-balancing of the telescopic platform and ensure the stability and reliability of the gravity center of the chimney maintenance platform.

The invention discloses a capacitor voltage self-balancing method of a three-level dual-active bridge converter. Different from the conventional balance control method, the invention provides an improved switch sequence which realizes the self-balance of the capacitor voltage from the modulation level. In the improved switch sequence, when the polarity of the output voltage of the NPC full bridge is not changed, only a single capacitor is used for energy exchange. The unbalance of the capacitor voltage enables the current of the transformer to be superposed with an asymmetric current component, thereby facilitating the balance of the capacitor voltage. The improved switch sequence does not change the original output voltage characteristics of the NPC full bridge. And meanwhile, additional capacitor voltage balance control is not needed, so that the complexity of a converter control system is greatly reduced, and the robustness of the converter is improved.

The invention discloses a thermal-electric-chemical coupled solid oxide stack which comprises a lower end plate and an upper end plate, and a plurality of SOFC (solid oxide fuel cell) single cells and SOEC (solid oxide electric cell) single cells are arranged between the lower end plate and the upper end plate; each SOFC single battery comprises an SOFC cathode, an SOFC electrolyte and an SOFC anode which are crimped in sequence; each SOEC single battery comprises an SOEC cathode, an SOEC electrolyte and an SOEC anode which are crimped in sequence; the chamber where the SOEC anode is located is communicated with the chamber where the SOFC cathode is located, and oxygen generated by electrolysis of the SOEC anode can enter the SOFC cathode side to participate in the reaction; and the SOFC single batteries and the SOEC single batteries are electrically connected in series through connectors or current collectors. According to the invention, the SOFC units and the SOEC units are arranged in the same electric pile alternately or in blocks, and specific gas paths and circuits are opened, so that gradient utilization of energy and efficient and stable operation of the system are realized.

The utility model discloses a small axial force multi-stage centrifugal pump which comprises a vertically arranged pump shell, a main shaft extending to the two sides is arranged in the pump shell, the upper end of the main shaft is provided with a balance drum, the balance drum is sleeved with a balance sleeve, and the outer curved surface of the balance sleeve is connected with the pump shell. A plurality of guide vanes are arranged at the upper end and the lower end of the interior of the pump shell, impellers are arranged at the upper end and the lower end of the main shaft, the upper impeller and the lower impeller are symmetrically arranged, and the multiple lower impellers correspond to the multiple lower guide vanes one to one and are located on the inner sides of the lower guide vanes one to one. The multiple upper impellers correspond to the multiple upper guide vanes one to one and are located on the inner sides of the multiple upper guide vanes one to one, a partition block is arranged at the middle end of the inner side of the pump shell, the lower end of the main shaft penetrates to the position below the partition block, and two first flange openings located on the upper side and the lower side of the partition block respectively are formed in the outer side of the pump shell. The small-axial-force multi-stage centrifugal pump has the advantages of being small in axial force and long in service life.

The invention belongs to the technical field of fluid blocking tests, and particularly relates to a test method of a pipe explosion simulation device based on a fluid blocking test. The tube bursting simulation device comprises an outer tube body and a crushing diaphragm located in a tube cavity of the outer tube body, the tube bursting simulation device further comprises a bursting disc, the bursting disc and the crushing diaphragm are sequentially arranged along the tube cavity of the outer tube body, and therefore a closed pressure adjusting cavity is formed in the portion, between the bursting disc and the crushing diaphragm, of the tube cavity of the outer tube body. The pressure adjusting cavity is communicated with a pressure air source or a pressure liquid source through a flow channel penetrating through the pipe wall of the outer pipe body. The device has higher controllability on pipe explosion pressure and pipe explosion time, and has the advantages of simplicity, convenience and rapidness in use and compact and reasonable structure.

The present invention belongs to the technical field of fluid blocking test, and specifically relates to a single damping check valve fluid blocking test system and a test method thereof. The system includes a damping check valve and a burst pipe simulation component, the inlet of the burst pipe simulation component is connected to the valve body inlet of the damping check valve, the valve body outlet of the damping check valve is connected to the outlet of the accumulator via the switch valve SV6, the inlet of the accumulator is respectively arranged with an air branch and a liquid branch, the air branch is connected to the air source via the regulating valve CV1, and the liquid branch is connected to the water storage container via the switch valve SV4, the water pump, and the switch valve SV3; the pressure regulating chamber of the burst pipe simulation component is connected to the air source via the switch valve SV1 and the regulating valve CV2 in sequence; the system also includes a bridging water circuit. The system uses the built-in burst pipe simulation component to accurately control the burst pipe pressure and storage time in the pipeline, which can ensure the high accuracy of the damping check valve test data while ensuring cost-effectiveness.

The utility model discloses an electronic control driving unit integrated heat dissipation device for a fuel cell, which comprises a protective structure box body, an electronic control driving unit is arranged in the protective structure box body, and the electronic control driving unit comprises a heating device; the fuel buffer tank body is provided with a fuel medium inlet and a fuel medium outlet; the fuel medium inlet is used for receiving a low-temperature fuel medium to be preheated, and the fuel medium outlet is used for discharging a preheated high-temperature fuel medium; wherein the fuel buffer box body and the protective structure box body form a heat conduction connecting structure, so that heat generated by the heating device is transmitted into the fuel buffer box body through the heat conduction connecting structure. The fuel cell system efficiency can be improved, the heat pipe level is improved, and the system structure is simplified.

The invention provides a main manipulator and a surgical robot. The main manipulator comprises an operating rod; the balance assembly is rotationally connected with the operating rod through a rotating shaft; one end of the magnetic assembly is connected with the balance assembly, and the other end is connected with the balance position of the operating rod; the magnetic assembly always applies constant magnetic force opposite to the gravity direction to the balance position so as to at least partially balance gravitational torque generated by the gravity of the operating rod relative to the rotating shaft. The invention solves the problems that the corresponding pulling (pressing) force of a spring of a main manipulator is linearly changed along with the extension and retraction of the length, and the dynamic self-balance cannot be realized. Therefore, how to provide the gravitational equilibrium mode of the main manipulator is the problem urgently needed to be solved at present.

The utility model relates to a novel C-shaped hook structure and a self-balancing type lifting appliance, the C-shaped hook structure comprises a box body, a front-section hook tooth and a rear-section hook tooth, the rear-section hook tooth is installed on the box body in a manner of being capable of turning over up and down and being positioned, and the front-section hook tooth is installed on the rear-section hook tooth in a manner of being capable of turning over up and down and being positioned. The lifting appliance has the advantages of being simple in structure, reasonable in design, capable of achieving automatic hooking and releasing of goods, capable of achieving automatic balance of the whole lifting appliance, capable of avoiding inclination of the lifting appliance due to center-of-gravity shift, convenient to use, high in efficiency, time-saving and labor-saving.

The disclosure provides a Kafka data landing method, relates to the technical field of distribution, and can be applied to the technical field of finance. The method comprises the following steps: in response to a data landing operation of a Kafka logical partition, intercepting a to-be-landed message; adding index information to the to-be-landed message, wherein the index information is used for locating the to-be-landed message; when it is determined that a preset packaging condition is met, putting to-be-landed messages of the same topic partition into a log block for packaging; determining a landing node of the log block according to a current disk remaining capacity; and routing the packaged log block to the landing node. The disclosure further provides a Kafka data landing device, equipment, a storage medium and a program product.

The mechanical leg comprises a first leg mechanism, a second leg mechanism and a driving mechanism, the first leg mechanism is used for being rotationally connected to a robot body of the robot, and the first leg mechanism is provided with a first limiting piece; the second leg mechanism is connected to the first leg mechanism in a sliding mode, and the second leg mechanism is provided with a second limiting piece; the driving mechanism is used for driving the first leg mechanism and the second leg mechanism to integrally rotate relative to the machine body and driving the second leg mechanism to move relative to the first leg mechanism in the first direction, so that the mechanical leg is telescopic, and the first direction is the telescopic direction of the mechanical leg; the second limiting piece is used for abutting against the first limiting piece when the second leg mechanism slides to the limiting position relative to the first leg mechanism so as to limit sliding of the second leg mechanism. According to the technical scheme of the embodiment of the utility model, the advancing efficiency of the robot is improved, the stability of the robot is ensured, and parts of the robot are prevented from being damaged due to collision.

The utility model relates to the technical field of hoisting, in particular to a hoisting balancing device for moving an oversized PC (Polycarbonate) component and a laminated slab. Comprising a balancing frame, lug plates, rope passing wheels and a steel wire rope, the balancing frame is of a rectangular frame structure, four sets of lug plates are symmetrically arranged on the long sides of the balancing frame, a plurality of sets of rope passing wheels are symmetrically arranged on the two long sides of the balancing frame, corner rope passing wheels are arranged at the four corners of the bottom of the balancing frame, and the steel wire rope penetrates through all the rope passing wheels and the corner rope passing wheels. And hoisting assemblies are hung on the steel wire ropes between the adjacent rope passing wheels and between the rope passing wheels and the corner rope passing wheels. Hoisting and falling are convenient, the falling accuracy is improved, the effective height needed by component hoisting is greatly reduced, the hoisting efficiency is improved, and the construction progress is guaranteed. The lifting balance device is mainly applied to the lifting balance aspect of oversized PC components and laminated slabs.

The utility model discloses an anti -deformation building plywood, including center base plate, the outside of center base plate is fixed with a pair of aluminium honeycomb core board, the outside of a pair of aluminium honeycomb core board all is fixed with first base plate, the outside of first base plate is fixed with second base plate, the outside of second base plate is fixed with third base plate, the thickness of center base plate to third base plate reduces in this way, the texture of center base plate to third base plate is 30 degree incremental staggered arrangement, and the whole plywood is composed of 7 base plates, starting from center base plate, the outside is the base plate arrangement of thickness gradually decreasing in proper order, wherein, base plate texture is staggered arrangement according to 30 degree 60 degree 90 degree, and the base plate of different thickness produces reverse stress when hygroscopic expansion, realizes the self -balancing of plywood, can reduce the warpage of plywood, and cooperates aluminium honeycomb core board and enhances the support of center base plate, can carry out active anti -deformation operation to plywood, has improved the service life of plywood.

The utility model discloses an anti -impact self -balancing formula hollow glass belongs to hollow glass field, including the fixed installation of slider in the bottom both sides of the card block side face is close, the fixed installation of locating block above slider, the fixed installation of installing block one side of locating block surface, the fixed installation of buffer spring rod in installing block internal center position, the fixed installation of resistance block on buffer spring rod surface, the guide rail of window frame surface both sides is established, the fixed installation of locating rod on the guide rail surface both sides, the sliding sleeve joint of locating rod surface has sleeve joint block, the fixed installation of link plate one side on sleeve joint block surface, through the cooperation of above -mentioned each mechanism, in the aspect of anti -impact, the combination of window frame and card block builds the stable support frame, and the card block of triangular shape is accurately installed in the four around window frame through slider and locating block, and is matched with buffer spring rod and resistance block, can evenly disperse and effectively absorb the impact force, prevent the breakage of hollow glass body because of local stress concentration.

The cleaning tool turret with the self-balancing sealing structure comprises a rotating disc, shaft sleeves, nozzle shafts, sealing rings and wave springs, the shaft sleeves are evenly distributed on the outer side face of the rotating disc, the nozzle shafts are rotationally connected with the shaft sleeves, liquid inlet holes are formed in the rotating disc, and liquid outlet flow channels are formed in the nozzle shafts; a liquid guide hole communicated with the liquid outlet runner is formed in the side wall of the nozzle shaft, a liquid guide runner communicated with the liquid inlet hole and the liquid guide hole is formed in the shaft sleeve, the sealing rings are symmetrically arranged on the two sides of the liquid guide hole of the nozzle shaft in a sleeving mode, a liquid guide gap is formed between the sealing rings, and the wave spring is arranged on the nozzle shaft in a sleeving mode and arranged in the liquid guide gap. A plurality of flow guide grooves are formed in the end face of the side, away from the liquid guide hole, of the sealing ring and extend outwards in the radial direction from the inner ring wall of the sealing ring. The self-balancing effect of pressure on the two sides of the sealing ring can be achieved, meanwhile, the friction force between the sealing ring and the nozzle shaft can be reduced, the sealing ring is prevented from being washed away and damaged, and the service life of the sealing ring is effectively prolonged.

The invention discloses a lever self-balancing device, and relates to the technical field of lever balancing, the lever self-balancing device comprises a stand column, a lifting rod, a lifting pulley block, a counterweight pulley block, a lifting block, a counterweight block and a counterweight swing arm, the lifting rod is arranged on the stand column, the lifting rod comprises a lifting arm and a counterweight arm, and the lifting arm and the counterweight arm are located on the two sides of the stand column respectively; the lifting arm is connected with the lifting block through the lifting pulley block, the counterweight arm is connected with the counterweight block through the counterweight pulley block, the free end of a lifting rope of the lifting pulley block is connected with the free end of a counterweight rope of the counterweight pulley block, one end of the counterweight swing arm is rotatably connected with the top of the stand column, and the other end is rotatably connected with the counterweight movable pulley. The position of the counterweight movable pulley can be automatically adjusted according to the characteristic that the counterweight swing arm can swing, so that the counterweight movable pulley is adaptive to the suddenly applied hoisting weight of the cargo boom in the hoisting stage, hoisting objects with different weights and the no-load stage, self-balance of the cargo boom and the counterweight arm is achieved, and then the safety coefficient is increased.