237results about "Telescopic elements" patented technology

The invention discloses a plane matrix type high folding and unfolding bionic antenna truss structure with a negative Poisson's ratio effect, and relates to the technical field of space folding and unfolding mechanisms, the plane matrix type high folding and unfolding bionic antenna truss structure comprises a plurality of cell elements and a plurality of cell element connecting rods, transverse cell elements are connected through the cell element connecting rods, and longitudinal cell elements are fixedly connected through adjacent cell element cross beams; the cell element connecting rods are hinged to the cell elements on the two sides respectively, and the cell elements are three-level positioning inwards-concave hexagonal cell elements; the folding and unfolding antenna truss structure is in a folded state during launching, transportation and silent latency and is in an unfolded working state during on-orbit task execution, the high folding and unfolding ratio characteristic of the antenna provides bionic improvement inspiration for various urgent properties such as stealth and size reduction of a satellite antenna structure, the shape of the antenna folding and unfolding array can be changed in a multi-stage mode, and the antenna folding and unfolding array is suitable for large-scale popularization and application. Therefore, the functions of optimal frequency band adjustment, optimal area expansion, switching of different scanning ranges and the like are realized.

The invention is applied to the technical field of communication, and provides an antenna control method and a communication device. The method may be applied to a communication device comprising a primary antenna panel and at least one secondary antenna panel, the primary antenna panel being in a deployed configuration. The method comprises the following steps: acquiring wind speed information; determining whether the form of the auxiliary antenna panel needs to be adjusted according to the wind speed information; and under the condition that the form of the auxiliary antenna panel needs to be adjusted, the form of the auxiliary antenna panel is adjusted. Wherein the form of the auxiliary antenna panel comprises an unfolded form and an ununfolded form, the antenna panel is in the unfolded form when the antenna panel performs signal transmission, and the antenna panel comprises a main antenna panel and the auxiliary antenna panel. According to the method, the form of the auxiliary antenna panel can be flexibly adjusted according to the wind speed information, so that the size of the antenna panel can be increased as much as possible under the condition that the requirement of wind resistance for the size of the antenna panel is met, and the communication capacity and resolution can be improved.

The invention discloses a mesh antenna metal net zero-constraint splicing method. A metal net is tiled and hung on a working tension applying device, and working tension is applied to the metal net in the transverse direction and the longitudinal direction; in the working tension state, tension control belts are sewn on the edges of the two sides of the metal net in the length direction; lapping two metal nets which need to be spliced and are sewn with the same tension control belts, wherein the sections of the lapping positions are lapped according to the sequence of belt-net-net-belt; sewing two layers of metal nets along the two sides of the tension control belt by adopting composite material sewing lines; and repeating the steps, and sewing all the metal meshes required by the whole antenna reflecting surface in sequence. According to the method, the metal net is spliced by adopting an overlock stitching method, the tension control belt can be detached after splicing is completed, the formed splicing seam is of a net-net structure, the thickness is only 0.07-0.08 mm, the elasticity keeps the original elasticity of the metal net, the net surface tension is more uniform, and the risk that the antenna expansion resistance is increased due to micro shrinkage of the tension control belt at high temperature is effectively eliminated.

The invention provides a multi-folding type unfolding device of a phased-array antenna and an assembling and working method of the multi-folding type unfolding device, and belongs to the field of space product structure and mechanism design. The problem that the unfolding capacity of an existing multi-fold unfolding type phased-array antenna is limited is solved. The multi-folding type unfolding device comprises a phased-array antenna unfolding part, an unfolding locking mechanism and a pressing and releasing mechanism, the side edge of the phased-array antenna unfolding part is connected with a main frame of a satellite through the unfolding locking mechanism, a plurality of pressing points are arranged on the phased-array antenna unfolding part, each pressing point is connected with the satellite through the pressing and releasing mechanism, and the phased-array antenna unfolding part is connected with the satellite through the pressing and releasing mechanism. The phased-array antenna unfolding part and the satellite bottom plate are both provided with phased-array antenna sub-arrays, the unfolding locking mechanism comprises a tightening arm, a top hinge and a root hinge, the top hinge is installed on the side face of the phased-array antenna unfolding part, and the root hinge is installed on the side face of a main frame of a satellite. The multi-folding unfolding device is mainly used for multi-folding unfolding of the phased-array antenna.

The invention provides an unfolding device of a satellite-borne phased-array antenna and an assembling and working method of the unfolding device, and belongs to the technical field of space product structure and mechanism design. The problem that the unfolding capacity of an existing unfolding type phased-array antenna is limited is solved. The unfolding device comprises a phased-array antenna unfolding part, unfolding locking mechanisms and a pressing releasing mechanism, in a pressing state, the phased-array antenna unfolding part is located below a satellite bottom plate, and the side edge of the phased-array antenna unfolding part is connected with a main frame of a satellite through the unfolding locking mechanisms which are symmetrically arranged; a plurality of pressing points are arranged on the phased-array antenna unfolding part, each pressing point is connected with a satellite through a pressing releasing mechanism, phased-array antenna sub-arrays are arranged on the phased-array antenna unfolding part and a satellite bottom plate, and the unfolding locking mechanism comprises an unfolding arm, an unfolding arm support, a torsion spring and a locking hook. The two ends of the two unfolding arms are rotationally connected with the two ends of the two unfolding arm supports. The satellite-borne phased-array antenna unfolding device is mainly used for unfolding satellite-borne phased-array antennas.

The invention discloses an automatic unfolding parabolic antenna with a flexible surface and a fixed surface combined, and belongs to the field of antennas. The antenna comprises a center body, a reflecting surface, a folding driving mechanism, an annular adjusting mechanism, an auxiliary surface, an auxiliary surface supporting structure and a feed source, wherein a feed source supporting cylinder plays a role in overall supporting. Wherein the fixed surfaces and the flexible surfaces are arranged at intervals to form an antenna reflecting surface, when the system works, the folding driving mechanism adopts an electric unfolding and folding mode to realize full-automatic unfolding and folding actions of the reflecting surface, and after the antenna is unfolded, the surface shape precision of the flexible surfaces can be adjusted through the annular adjusting mechanism. The invention provides a flexible and fixed surface combined reflecting surface structure form for the first time, and full-automatic unfolding and folding of the whole reflecting surface are realized. A traditional manual assembly mode is broken through, the maneuvering performance of the large-diameter vehicle-mounted antenna is effectively improved, the antenna opening time is shortened to be within 15 minutes, and the position precision of the antenna when the antenna is unfolded again is guaranteed while the maneuvering performance is improved.

The invention discloses an interference elimination device for a router antenna, which relates to the technical field of routers and comprises a clamp mechanism. According to the interference elimination device for the router antenna, through the design of a clamp mechanism, in the process that a clamping plate clamps the surface of a router, a supporting rod extrudes a third spring on the inner side of a clamp shell, so that the damping and buffering effects are achieved, the clamping pressure of parts is reduced, damage to objects is avoided, and therefore the service life of the parts is prolonged; secondly, the supporting rods are contracted according to the appearance of the router, so that the supporting rods can be conveniently attached to the surface of the object, the clamping and attaching effect is improved, a certain anti-skid effect is achieved, the circular plates are made of silicone grease materials, heat conduction is enhanced, the overall heat dissipation efficiency is improved, the heat dissipation effect of equipment is kept, and the service life of the equipment is prolonged. Meanwhile, the contact area of the circular plate is small, space is reserved in the router clamping process, and the heat dissipation effect of equipment is prevented from being affected.

The present invention relates to a folding device for an antenna element layer, which comprises two first truss beams; two second truss beams; a support cross beam, including support legs and a cross beam main body; a telescopic driving mechanism arranged on the cross beam main body; a first link mechanism, including two first links, two second links and two first linkage rods; one ends of the two first links are hinged to one end of the cross beam main body, the middle parts of the first links are respectively hinged to the middle parts of the second links, and the hinge points between the first links and the second links are also respectively hinged to the second truss beams, the other ends of the first links are respectively hinged to one ends of the first linkage rods, and the other ends of the first linkage rods are respectively hinged to the first truss beams; one ends of the two second links are hinged to the telescopic driving mechanism. For the above folding device of the antenna element layer, when the antenna element layer needs to be repaired or is not in use, the telescopic driving mechanism drives the first link mechanism to fold up, and the folding device of the antenna element layer folds, which is convenient for maintenance and storage.

The application discloses an over-constrained cross type deployable parabolic cylindrical antenna support structure and particularly relates to the technical field of aerospace. The application comprises a plurality of arc surface deployable units, cylindrical deployable units and a motion control device, the arc surface deployable units are deployed to form an arc-shaped support surface, the cylindrical deployable units are deployed to form a linear support surface, and the motion control device is used for controlling the cylindrical deployable units to drive the arc surface deployable units to be deployed or contracted. The technical scheme of the application aims to provide a reference value for the structural design of a large-scale deployable parabolic cylindrical antenna, realizes the support of the deployable parabolic cylindrical antenna, and is beneficial to the structural design of the deployable parabolic cylindrical antenna.

The utility model discloses an assembly assembly dotting frock, including work table, the top of work table is sequentially provided with feeding station, assembly station, pre -dotting station, dotting station and material collecting box, and the inside of work table is provided with through groove, and one side of through groove is provided with mounting panel, and the top of through groove is provided with material shifting board, and the side of mounting panel is provided with linear slide rail, and material shifting board passes through sliding block and is installed on linear slide rail, and one side of material shifting board is sequentially provided with first material shifting dog, second material shifting dog, third material shifting dog and fourth material shifting dog, and the utility model discloses through with antenna mast from feeding station sequentially after assembly station, pre -dotting station and dotting station, then, fall into the inside of material collecting box, realized the automatic integration of antenna mast feeding, assembly, dotting and collection, reduced the consumption of human resources, improved production efficiency.

The present invention provides a curved elastic deployable rod-type film structure, which includes: a mounting body, a mounting plate provided on the end surface of the mounting body, a rotating shaft provided at the center of the mounting plate; a guide mechanism, which forms a preset track with the rotating shaft; a curved rod, one end of which is connected to the rotating shaft, and the other end of which extends radially outward from the center of the mounting plate or winds and contracts inward from the edge of the mounting plate along the preset track during the rotation of the rotating shaft; a film, which is connected to the curved rod, and when the curved rod extends radially outward from the center of the mounting plate, the film gradually unfolds to a curved state; when the curved rod winds and contracts inward from the edge of the mounting plate, the film gradually contracts to a folded state; and a limiting mechanism, which includes a fixing column, an extrusion member, and an elastic member. Compared with conventional planar deployable film structures at the current stage, the present invention not only improves its flexibility of use, but also improves the directional reflectivity, communication quality, signal transmission efficiency, rigidity, and stability of the film after deployment.

The invention discloses a horn antenna device with a reconfigurable wave beam and a using method thereof, and belongs to the technical field of antennae, and the horn antenna device comprises a wave same module which is relatively and fixedly arranged at the tail end of the horn antenna device; the three-axis telescopic framework is connected to the front end of the wave-same module, and the three-axis telescopic framework is at least composed of a transverse electric control telescopic component, a longitudinal electric control telescopic component and a depth direction electric control telescopic component and is used for changing the aperture and the depth size of the horn antenna; the distance feedback device is arranged at the oral surface position of the three-axis telescopic framework and is used for detecting in real time and feeding back the actual oral surface size to the control extension set; and the control extension set is electrically connected with the transverse electric control telescopic component, the longitudinal electric control telescopic component, the depth direction electric control telescopic component and the distance feedback device. The wave beam reconfigurable horn antenna device is simple and small in structure and high in structural strength, can expand various frequency bands and gains, and has high development and use potential.

The application relates to the technical field of aerospace equipment, in particular to a stretchable release mechanism for separating a lunar soil penetration projectile communication antenna, which comprises a main body, the main body comprising a first mounting surface and a second mounting surface, the first mounting surface being arranged obliquely to the second mounting surface; an antenna oscillator arranged on the first mounting surface and provided with a locking ring for locking the antenna oscillator; a super-elastic conductive member sleeved on the second mounting surface; and a fuel line release mechanism arranged on the super-elastic conductive member, one end of the fuel line release mechanism being connected with the locking ring and the other end being connected with one end of the second mounting surface away from the first mounting surface. The arrangement of the fuel line release mechanism avoids the risk of failure of the stretchable release mechanism for separating the lunar soil penetration projectile communication antenna.

An antenna for charging and measurement may comprise: a telescopic support installed at a lower portion of an aerial vehicle and configured to contract when the aerial vehicle lands on a wireless station and extend when the aerial vehicle takes off from the wireless station; and an antenna coil part deformed into a spiral shape when the telescopic support is contracted so that the wireless station receives wireless power and deformed into a conical shape when the telescopic support is extended to measure a radio signal.

The invention discloses a portable frequency interferometer and a wireless signal shielding system. The portable frequency interferometer comprises an interferometer host used for generating a radio interference signal; the at least one antenna assembly is used for transmitting the radio interference signal; and a movable connecting piece. The interferometer host is movably connected with the at least one antenna assembly through the movable connecting piece, so that the antenna assembly can move relative to the interferometer host, and the antenna assembly and the interferometer host can be fixed. According to the portable frequency interferometer, the antenna assembly is movably connected to the interferometer host, integration of the antenna assembly and the interferometer host is achieved, the overall size of the portable frequency interferometer is more compact, miniaturization of the portable frequency interferometer is facilitated, and the appearance of the portable frequency interferometer is simpler and more attractive.

The utility model discloses a posture monitoring communication antenna, which relates to the technical field of communication antenna equipment and comprises a sucker seat, an antenna telescopic rod arranged at the top of the sucker seat, a reflecting plate arranged at the top of the sucker seat, a plurality of reflecting strips matched with the reflecting plate arranged at the top of the reflecting plate, and a connecting rod arranged between the reflecting strips and the antenna telescopic rod. A positioning pin is arranged at the bottom of the reflecting strip, holes matched with the positioning pin are formed in the surface of the reflecting strip and the top of the reflecting plate, the multi-stage telescopic rod serves as an antenna, the length of the antenna can be changed, one side of the antenna is shielded by a housing composed of the reflecting strip and the reflecting plate, the signal receiving and transmitting direction of the antenna is accurate, and the antenna is more compact. And the antenna telescopic rod can be stretched and extended, the reflection strip is separated from the reflection plate in the extension process, the radiation area for signal sending and receiving is increased, the height is increased after the whole structure is completely unfolded, the height and the receiving area of the antenna can be adjusted without assistance of external equipment.

The utility model provides an automatic antenna feeder system, which comprises a base, a lifting rod, a lodging mechanism and an antenna which are sequentially arranged from bottom to top, a take-up mechanism is arranged on the lifting rod, and the lodging mechanism rotates along with the lifting of the lifting rod so as to drive the antenna to lodge or erect in a vertical plane. According to the automatic antenna feeder system provided by the utility model, on the basis of a traditional automatic antenna feeder system, the control of the lodging mechanism is changed from electrical control to mechanical control, and the same linkage is realized by virtue of the descending power of the lifting rod, so that the upper-mounted antenna on the lodging mechanism is lodged and erected; therefore, parts such as a centralized control box and a composite cable (a lodging control mechanism) are reduced.

The application discloses a large-diameter rib-column tension type deployable antenna mechanism and relates to a deployable antenna, which is used for solving the problems of the current lack of large-scale deployment mechanism of the existing tension type antenna mechanism and the large mass and low rigidity of the large-diameter antenna deployment structure. The application comprises a telescopic column, a plurality of rib units and a motor screw rod control unit. The motor screw rod control unit is installed in the middle of the telescopic column. The plurality of rib units are arranged in the circumferential direction. The root of each rib unit is connected with the motor screw rod control unit. The application adopts the bifurcation design of the rib end, reduces the length of the outermost circle of the tension cable, reduces the rope suspension depth, can obtain the effective diameter of the large antenna with less rib number, and makes the structure mass lighter due to the less rib number. The three-circle cross tension cable between the adjacent ribs, the telescopic column in the center and the tension cable at the rib end are designed, so that the structure is tensioned into a whole, and the rigidity of the structure is improved. The application belongs to the technical field of aerospace engineering.

The invention relates to the technical field of communication equipment, in particular to a communication base station which comprises a baseband processing unit, a radio frequency processing unit and an antenna feeder system which are installed on a stand column, the antenna feeder system is movably installed on the side portion of the stand column through a stretching component, and a movable frame of a stretching component body is installed on the side portion of the stand column in a sliding mode; the working angle and position of the antenna feeder system are adjusted by controlling the extension amplitude of the antenna feeder system on the side part of the stand column, so that the capability of resisting severe weather of the antenna equipment is improved; under the condition of hail weather, the antenna feeder system is erected, and the hail impact area is reduced; under the condition of storm weather, the antenna feeder system is folded towards the position close to the stand column, the extending distance of the antenna feeder system is shortened, the pressure borne by the connecting component is reduced, and the connecting component is prevented from being broken and damaged.

The embodiment of the invention provides an antenna. The antenna comprises a telescopic assembly, a reflection assembly and an electromechanical conversion assembly, the telescopic assembly comprises a fixed end and a free end, and the fixed end of the telescopic assembly is connected with the first end of the electromechanical conversion assembly; the length of the telescopic assembly is adjusted by stretching or compressing the free end of the telescopic assembly. The mechanical stress state of the first end of the electromechanical conversion assembly is adjusted by adjusting the length of the telescopic assembly, so that the mechanical vibration characteristic of the electromechanical conversion assembly is adjusted. The reflection assembly is connected with the second end of the electromechanical conversion assembly, and the reflection assembly adjusts the electromagnetic field distribution of the antenna by reflecting the electromagnetic radiation converted by the electromechanical conversion assembly; the first end of the electromechanical conversion assembly and the second end of the electromechanical conversion assembly are opposite ends. The antenna can improve the radiation efficiency.

The present application is applied to the technical field of communications. Provided are an antenna control method and a communication apparatus. The method may be used for the communication apparatus. The communication apparatus comprises a main antenna panel and at least one auxiliary antenna panel, the main antenna panel being in a deployed form. The method comprises: acquiring wind speed information; according to the wind speed information, determining whether the form of an auxiliary antenna panel needs to be adjusted; and if the form of the auxiliary antenna panel needs to be adjusted, adjusting the form of the auxiliary antenna panel, wherein the auxiliary antenna panel has a deployed form and a non-deployed form, when an antenna panel performs signal transmission, the antenna panel is in the deployed form, and the antenna panel comprises the main antenna panel and the auxiliary antenna panel. The method allows flexible adjustment of the forms of auxiliary antenna panels on the basis of wind speed information, so that the sizes of antenna panels can be increased as much as possible while satisfying the requirements on the sizes of antenna panels by wind resistance, thereby further improving the communication capacity and resolution.

The invention discloses a lightweight radio frequency SIP (Session Initiation Protocol) system based on a frequency-adjustable antenna, which relates to the technical field of safety management and comprises a frequency-adjustable antenna module, a feed module, a filter module, a power division module, a distribution adjustment module, an amplitude-phase control module, a transceiving component module, a power supply module and a radio frequency signal interconnection module. According to the invention, the beamforming precision can be improved, the directivity can be enhanced, the working frequency band can be dynamically adjusted, the system flexibility is improved, the anti-interference capability is improved, the communication reliability is enhanced, and the frequency adjustment function of the horn antenna within a certain frequency range is realized.

The present invention discloses a combined-drive high-storage-ratio sleeve extension arm, wherein a drive mechanism is used to drive the extension of the i+1-level sleeve relative to the i-level sleeve; a rope drive system is used to drive the extension of the deployment rib assembly relative to the n-level sleeve while the n-level sleeve is extended relative to the n-1-level sleeve; a locking mechanism is responsible for locking the sleeves and deployment ribs at each level after they are extended into place; when the deployment rib unlocking mechanism is locked with the deployment rib, the deployment rib is in a retracted state; when the deployment rib unlocking mechanism is unlocked with the deployment rib, the deployment rib is in an extended state. The present invention also discloses an extension method for a combined-drive high-storage-ratio sleeve extension arm, comprising a drive mechanism driving the n-level sleeve to extend relative to the n-1-level sleeve, while the rope drive system drives the extension of the deployment rib assembly relative to the n-level sleeve; until the 2-level sleeve is extended into place relative to the 1-level sleeve, and the deployment rib is in an extended state. The present invention can realize the step-by-step extension of the extension arm, which is beneficial to improving the driving efficiency.

The utility model relates to an antenna support capable of being rapidly unfolded and folded, and belongs to the field of portable antenna supports. The support comprises four groups of cross structures and two parallel vertical rods; each group of cross structures comprises two folding support rods and two angle plates; the two folding supporting rods are arranged in the same plane in a crossed mode and hinged through a rotating shaft. One angle plate is mounted at the top of the corresponding folding support rod, and the other angle plate is mounted at the bottom of the corresponding folding support rod; one side of the corner-free plate of one cross structure is connected with one side of the corner plate of the other cross structure, and the corner-free plate end of the folding support rod is hinged to the corner plate of the other cross structure; the two vertical rods correspond to the two sets of angle plates of the crossed structure. And the two angle plates of the crossed structure are restrained on the corresponding vertical rods. The folding and unfolding device has the advantages of being compact in structure, high in bearing capacity, low in cost, high in structural reliability and the like, and can be unfolded and folded without tools and disassembly.

The utility model relates to the technical field of watches, in particular to a telescopic antenna cavity structure of an intelligent watch, which comprises a watch body, the top surface of the watch body is coaxially and rotatably connected with a rotary cover, the inside of the watch body is movably connected with a liftable lifting seat, and the top of the lifting seat is provided with a ceramic antenna module. The surface of the rotary cover is cooperatively provided with a probe hole for the ceramic antenna module to extend out, the surface of the lifting seat is fixedly connected with a guide block, a spring is fixedly connected between the guide block and the meter body, the bottom surface of the rotary cover is cooperatively provided with an arc-shaped inclined wall for limiting the guide block, and the highest point of the arc-shaped inclined wall is communicated with the probe hole. According to the technical scheme of the utility model, the problem that the static structure is difficult to adapt to the requirements of dynamic scenes in the antenna design of a conventional watch with a metal watchcase can be solved.

The application discloses a beam reconfigurable horn antenna device and a use method thereof, and belongs to the technical field of antennas, and comprises: a wave module which is fixedly arranged at the tail end of the horn antenna device; a three-axis telescopic framework which is connected to the front end of the wave module, and is composed of at least a transverse electric control telescopic component, a longitudinal electric control telescopic component and a depth direction electric control telescopic component, and is used for changing the aperture and the longitudinal depth size of the horn antenna; a distance feedback device which is arranged at the aperture position of the three-axis telescopic framework, and is used for detecting the actual aperture size in real time and feeding back the actual aperture size to a control extension; and a control extension which is electrically connected with the transverse electric control telescopic component, the longitudinal electric control telescopic component, the depth direction electric control telescopic component and the distance feedback device. The beam reconfigurable horn antenna device has the advantages of simple structure, small size, high structural strength, and can expand horn antennas of various frequency bands and gains, and has high development and use potential.

The present invention provides a helical antenna device, comprising an extension rod, a base, an upper bracket, a flexible support tube, a helical antenna, and a locking device. The extension rod comprises a first connecting tube, a multi-stage retractable and deployable tubular structure, and a second connecting tube, connected sequentially from top to bottom. The multi-stage retractable and deployable tubular structure comprises multiple retractable and deployable tubes, adjacent retractable and deployable tubes being connected via a third connecting tube. The retractable and deployable tubes comprise multiple drive plates, which are arranged in a circle to form the drive tube. The drive plates are made of a shape memory polymer composite material. The extension rod has upper and lower ends connected to the upper bracket and the base, respectively. The flexible support tube is coaxial with the extension rod and has upper and lower ends connected to the upper bracket and the base, respectively. The helical antenna is wound around the flexible support tube. The locking device is used to lock and release the extension rod and the base. The device of the present invention can simultaneously achieve low impact, high controllability, and high reliability during the deployment process, as well as high rigidity after deployment.

The present invention discloses a manually-operated lifting rod, which comprises a lifting rod main body and a lifting driving device. The lifting rod main body includes an outer sleeve, an intermediate sleeve and an inner sleeve that are slidably sleeved with each other from outside to inside in sequence. A first fixed pulley is rotatably installed at the top of the outer sleeve. A transmission cavity is provided at the bottom of the outer sleeve, and a second fixed pulley is rotatably installed in the transmission cavity. A first movable pulley and a second movable pulley are respectively rotatably installed at the bottom and the top of the intermediate sleeve. The other end of the first winding rope is fixedly connected to the bottom of the inner sleeve after winding around the first fixed pulley, the first movable pulley and the second movable pulley in sequence. One end of the second winding rope is fixedly connected to the second winding wheel, and the other end of the second winding rope is fixedly connected to the bottom of the inner sleeve after winding around the first fixed pulley and the second fixed pulley in sequence. When the first winding rope is loosened, the second winding rope is tensioned, and the lifting rod has power during the descending process, and it is not easy to get stuck during the lifting process, effectively reducing the failure rate of the lifting rod during use.