27results about How to "Suppression offset" patented technology

This invention discloses a large-tapered anti-backlash tailstock adapted to a four-axis rotary table, specifically relating to the field of tailstock technology. It includes a base with a positioning and locking assembly. The positioning and locking assembly includes a central inner liner plate located in the middle of the base, with a mounting cavity in the center of the inner liner plate. An axially adjustable crossbar is inserted into the mounting cavity. This invention employs a dual-redundant structure of hydraulic and mechanical locking to fundamentally prevent the tailstock from backing up under force. The locking force is uniform and sufficiently rigid, achieving zero axial displacement positioning of the tailstock rod, thus laying a solid foundation for machining accuracy. Simultaneously, the dual locking, combined with a two-stage adjustment mechanism of coarse and fine axial adjustment, allows for deep synergy between adjustment and locking functions. Once adjusted to the correct position, the tailstock is quickly locked, improving positioning accuracy and making the anti-backlash effect more stable.

The utility model relates to a kind of buckle wire fork assemblies of double-needle computerized embroidery machine.It involves embroidery machine technical field.The application specifically includes the buckle wire mounting plate fixedly connected with shuttle box body, the buckle wire driving mechanism fixedly connected with buckle wire mounting plate, the buckle wire guide mechanism fixedly connected with buckle wire mounting plate, and buckle wire mechanism;The upper fulcrum of buckle wire mechanism bottom is connected with buckle wire driving mechanism, the lower fulcrum of buckle wire mechanism bottom is connected with buckle wire guide mechanism, buckle wire driving mechanism is used to drive buckle wire mechanism swing around lower fulcrum, and buckle wire guide mechanism limits the swing of buckle wire mechanism around lower fulcrum.Two buckle wire forks symmetrically provided on the buckle wire mechanism of the utility model, when buckle wire driving mechanism drives buckle wire mechanism swing around lower fulcrum, buckle wire mechanism can simultaneously carry out the buckle wire and loose line of double-needle surface thread through two buckle wire forks symmetrically arranged, to reduce the occupation of space by buckle wire fork assembly, and then make the structure of double-needle computerized embroidery machine more compact.

This invention provides a multi-energy field assisted ultrasonic cutting device and method for CFRP preforms, relating to the fields of intelligent manufacturing and precision machining technology. The invention uses a laser generator to precisely and locally heat the cutting area, softening the resin matrix in the processing area and significantly reducing the material's strength and cutting resistance. Simultaneously, eddy current tubes cool the non-cutting areas of the workpiece, enhancing the stiffness of the resin matrix in these areas and the constraint force on the carbon fibers, effectively suppressing excessive deformation and displacement of the carbon fibers during processing. Ultrasonic vibration further induces brittle fracture of the carbon fibers through high-frequency impact, reducing the tensile effect caused by resin viscosity. Ultimately, this achieves the beneficial effects of high-quality, high-efficiency, and low-damage processing of CFRP preforms.

The utility model relates to the field of hoist accessory, concretely relates to a hoist tail rope anti -twisting device, including fixed frame and two groups of constraint frame, two groups of constraint frame are respectively rotationally arranged in fixed frame both sides, the opposite side middle part of two groups of constraint frame all are fixed with limit stop, two limit stops opposite sides can mutually adhere, two groups of constraint frame opposite sides both sides all are provided with inner branch and outer branch, and the inner branch and the outer branch of adjacent position are located constraint frame same side, and the inner branch is located in the inner side of outer branch and can mutually abut tightly, and adjacent inner branch and outer branch constitute the blocking structure, the utility model discloses when one side tail rope occurs torsion and extrudes this side inner branch, not only does this inner branch limit the constraint of tail rope, still through the abutment cooperation with the outer branch of same side, the tail rope pressure of self -sustaining is conducted to the constraint frame of another side, thereby when tail rope deflection is by both sides constraint frame synchronous provides the constraint force of constraint, and the tail rope pressure is borne in common, effectively suppresses the deflection of tail rope.

The application discloses a high-rigidity linear sliding rail with automatic centering and four-direction load capacity, and particularly relates to the technical field of linear sliding rails, and comprises a guide rail, a sliding block is slidably arranged on the top of the guide rail, and a transmission unit is arranged on the inner side top end of the sliding block and comprises two groups of upper load bearings arranged in a symmetrical mode. The four-column circular-arc ball groove and the 45-degree contact angle of the steel ball can balance the four-direction load of the radial direction, the reverse radial direction and the horizontal and vertical directions, and realize automatic centering. Four groups of pre-pressing clamping positioning blocks are arranged between the sliding block and the bottom end of the guide rail, so that the installation precision and the operation stability of the sliding block on the guide rail can be obviously improved, the deviation and vibration in the sliding process can be further inhibited, the accurate positioning and the guiding constraint for the linear motion can be continuously provided, the high-precision smooth sliding of the sliding block along the guide rail axis direction is realized, and the positioning precision and the motion smoothness in the linear transmission process are double-protected.

This utility model relates to an online outer diameter measuring device, including a detection mounting base and an outer diameter measuring pen. Two material support frames are fixedly mounted on the detection mounting base, arranged along the length of the base, and each frame has a bearing groove adapted to the workpiece shape. A first guide rail is fixed on the detection mounting base between the two material support frames, and a second guide rail is slidably mounted on the first guide rail via a first slider. This utility model utilizes the V-shaped bearing grooves on the material support frames to adapt to the workpiece shape, combined with an anti-slip and wear-resistant pad adhered to the groove walls. Through the V-shaped positioning principle, the workpiece is stably supported. The anti-slip and wear-resistant pad increases the friction between the workpiece and the pad, effectively suppressing workpiece offset or tilting caused by placement deviation or rolling, ensuring that the workpiece axis remains consistent with the detection reference, and fundamentally reducing errors caused by detection position deviation.

The application discloses a stable control method for power regulation of a two-stage series-connected impulse power station with a regulating pool, which firstly establishes a mathematical model of the series-connected impulse power station with the regulating pool, and proposes a power-water level coordinated control strategy, namely, a proportional integral control strategy with a relative value of a power deviation of a first-stage power station as an input signal for the first-stage power station, and a double proportional integral control strategy with a relative value of a power deviation of a second-stage power station and a relative value of a water level deviation of the regulating pool as input signals for the second-stage power station; on the basis, a stability analysis model of the series-connected power station is constructed, and a determination method for the governor control parameters of the first-stage power station and the second-stage power station is proposed. The control method proposed by the application not only can realize the rapid and stable regulation of the power of the series-connected power station, but also can effectively guarantee the fluctuation stability of the water level of the regulating pool, has the advantages of clear physical meaning and strong engineering applicability, provides a theoretical basis for guaranteeing the synchronous stable operation of the series-connected impulse power station with the regulating pool, and has a wide application prospect.

The utility model relates to the field of thread detection, and discloses a multi-specification thread detection go-no go gauge device, comprising a detection bench, the top of the detection bench is provided with a switching mechanism and a limiting guide mechanism, the switching mechanism comprises a lifting plate, the bottom of the lifting plate is fixedly connected with a circular block, the inner wall of the circular block is rotatably connected with a cross-shaped rotating block, and the cross-shaped rotating block is fixedly connected with the detection bench. A limiting lifting block is slidably connected to the inner wall of the cross rotating block, a connecting rotating cylinder is rotatably connected to the inner wall of the limiting lifting block, and a supporting rotating plate is rotatably connected to the inner wall of the circular block. According to the utility model, through the arrangement of the switching mechanism, a plurality of go / no-go gauge detection heads with different specifications can be loaded at the same time, when different thread specifications need to be detected, the motor II drives the cross-shaped rotating block to rotate, the detection heads with corresponding specifications are rapidly switched, manual tool replacement is not needed, automatic control of detection head switching is realized, manual operation links are reduced, and the detection efficiency is improved. The labor intensity is reduced, and the detection efficiency is greatly improved.

This utility model relates to the field of physical and chemical testing technology, specifically to a bending test device for dissimilar steels, comprising: a pressure head, the bottom of which forms a pressure end for contacting the upper end of the test plate, the pressure end being used to apply a bending force to the center of the test plate along its length; the device further comprises: a stop member; and a fixing assembly for detachably installing the stop member at the lower end of the pressure end. This utility model, by installing a stop member at the bottom of the existing pressure head, can pre-position the test plate using the stop member and the pressure head. When the test plate is deformed under pressure, the stop member generates a horizontal force on the test plate to prevent the test plate from shifting along its length, maintaining the center of the test plate's length on the same extension line as the pressure end of the pressure head, ensuring that the test plate is bent into a U-shape, meeting the test standards.

This utility model provides a photoelectric support for a conveyor line, comprising: a base, an electric telescopic rod rotatably connected to the upper end of the base, and a fixed frame fixedly installed at the upper output end of the electric telescopic rod. This photoelectric support for a conveyor line, through the arrangement of a receiving cavity, a protective shell, a sliding groove, an electric telescopic rod, a connecting block, a telescopic plate, a steering ball, and a motor, provides installation and protection space for the drive components through the receiving cavity and the protective shell. The sliding groove, in conjunction with the slider, ensures smooth rotation. The electric telescopic rod, combined with the connecting block and the telescopic plate, enables precise height adjustment and enhances structural rigidity. The steering ball and the motor enable precise electric control of the detection angle. The various structures work together to improve the flexibility and accuracy of adjustment, meeting the detection needs under different working conditions. Furthermore, multiple stabilization mechanisms reduce swaying and offset, ensuring the continuous and stable operation of the photoelectric sensor, significantly enhancing the practicality, reliability, and adaptability of the support.

The utility model relates to the technical field of thick paperboard cutting, in particular to a paperboard cutting device which comprises a conveying mechanism, a cutting mechanism and a cutting mechanism. A first moving mechanism; a second moving mechanism; the first rotating mechanism is arranged on the first moving mechanism, and the first moving mechanism is used for driving the first rotating mechanism to move up and down; the second rotating mechanism is arranged on the second moving mechanism, and the second moving mechanism is used for driving the second rotating mechanism to move up and down; the first cutting disc is arranged on the first rotating mechanism, and the first rotating mechanism is used for driving the first cutting disc to rotate; the second cutting disc is arranged on the second rotating mechanism, the second cutting disc and the first cutting disc are arranged in a coplanar mode, and the second rotating mechanism is used for driving the second cutting disc to rotate; the cutting edge included angle of the first cutting disc is larger than that of the second cutting disc. The paperboard cutting device aims at solving the problem that thick paperboards are not easy to cut in the prior art.

The invention relates to a bamboo chip curved surface cold-bending shaping device and method, and relates to the technical field of cold-bending machining.The bamboo chip curved surface cold-bending shaping device comprises a mounting plate, supporting plates are symmetrically arranged at the top of one side of the mounting plate, a rotating shaft is arranged between the supporting plates, the rotating shaft is sleeved with a roller, baffles are symmetrically arranged on the outer wall of the roller, and an H-shaped rack is further arranged at the top of the mounting plate; a plurality of rotating shafts are rotationally arranged between the inner walls of the top of the H-shaped rack, the rotating shafts are sleeved with upper rollers of different specifications, lower rollers matched with the upper rollers are rotationally arranged between the inner walls of the top of the H-shaped rack, a centering mechanism is arranged on the outer wall of the side, close to the roller, of the H-shaped rack, and stabilizing mechanisms are arranged in the H-shaped rack and located on the two sides of the rotating shafts; by means of the aluminum profile machining device, the following problems can be solved: through cooperation of an upper rotating roller and a lower rotating roller, it can be guaranteed that the bottom faces of aluminum profiles with different thicknesses are located on the same horizontal plane when the aluminum profiles enter the device; through cooperation of the arc-shaped triangular blocks and the upper roller, aluminum materials are prevented from deviating in the machining process.

The present invention provides a plasma processing method and a plasma processing apparatus capable of applying a DC voltage to an edge ring while suppressing a shift in the characteristics of plasma applied to the entire substrate. The plasma processing method includes: a step (a) of generating plasma inside a chamber; a step (b) of applying a DC voltage to an edge ring surrounding the periphery of a substrate while the plasma is being generated; a step (c) of acquiring a first voltage of the edge ring while the DC voltage is being applied; a step (d) of stopping the application of the DC voltage; a step (e) of acquiring a second voltage of the edge ring while the application of the DC voltage is being stopped; and a step (f) of calculating a parameter for controlling the DC voltage based on the first voltage and the second voltage.

The invention belongs to the technical field of welding, and particularly discloses a programming-free welding device with a stable bearing function, which comprises a welding main body, and the welding main body comprises a transverse slide rail, a support frame, a longitudinal slide rail, a welding mechanical arm, a connecting sleeve, a guide pipe and a welding wire; the supporting frame is slidably connected to the top of the transverse sliding rail, the longitudinal sliding rail is fixedly installed on the top of the supporting frame, the welding mechanical arm is slidably connected to the bottom of the longitudinal sliding rail, and the connecting sleeve is connected to the end, away from the longitudinal sliding rail, of the welding mechanical arm through threads. And the removing assembly is used for removing impurities such as oxide layers and dust on the surfaces of the welding wires, and the removing assembly is connected with the connecting sleeve and the welding wires. By arranging the removing assembly, dust, an oxide layer and other impurities on the outer wall of the welding wire can be removed in a segmented mode, the welding quality is ensured, the defects of air holes, slag inclusion and the like are avoided during welding, the removing pressure of the removing assembly can be adjusted according to the material of the welding wire and the removing requirement, and the application range is widened.

The application provides a chuck assembly of a jigsaw, and relates to the technical field of jigsaws, which comprises a chuck body, a rotating sleeve, an elastic clamping sleeve and a plurality of steel balls. The inner periphery of the rotating sleeve is provided with a plurality of eccentric grooves in the circumferential direction, the plurality of eccentric grooves are arranged in one-to-one correspondence with the plurality of steel balls, and each eccentric groove is in communication with a saw blade mounting position. The plurality of eccentric grooves comprise a first eccentric groove group located on both sides of the saw blade in the width direction and a second eccentric groove group located on both sides of the saw blade in the thickness direction. When the rotating sleeve rotates from the release position to the locking position, the steel balls located in the first eccentric groove group move radially inward and press the elastic clamping sleeve tightly, so that the elastic clamping sleeve deforms towards the saw blade to clamp the saw blade in the width direction. The steel balls located in the second eccentric groove group move radially inward and press both sides of the saw blade in the thickness direction to clamp the saw blade in the thickness direction. The eccentric grooves drive the steel balls to apply radial force in different regions to clamp the saw blade in the width and thickness directions simultaneously.

The utility model relates to the technical field of 3D printing, in particular to a photocuring 3D printer moving platform device which comprises a bottom plate, an adjusting structure is arranged on the bottom plate, and a plurality of fixing structures are arranged on the bottom plate. According to the moving platform device of the photocuring 3D printer, through the arranged adjusting structure, a belt wheel transmission system driven by a motor is adopted in the scheme, power is efficiently transmitted to a rotating frame through precise linkage of a second belt wheel, a transmission belt and a first belt wheel, and stable rotation and linear displacement of a rotating threaded rod are achieved; according to the 3D printer height adjusting device, the moving plate is accurately guided through the guide rod, deviation and shaking in the moving process are effectively restrained, it is guaranteed that the height of a 3D printer can be smoothly and accurately adjusted in the vertical direction, and high efficiency, stability and accuracy of height adjustment of equipment are achieved through strict mechanical transmission logic and structure cooperation.

The present application provides a surface mounting electronic component and a circuit substrate, which can inhibit the shift of mounting position in the short side direction of the electronic component. The surface mounting electronic component (1) comprises a main body (10) with a mounting surface (11) and terminal electrodes (20, 30) respectively arranged at both ends of the mounting surface (11) in the y direction. The terminal electrodes (20, 30) comprise a main area (21, 31) extending in the y direction and a protruding part (22, 32) arranged at the central part in the y direction and protruding from the main area (21, 31) to the end of the mounting surface (11) in the x direction. Thus, the protruding part (22, 32) arranged at the terminal electrode (20, 30) plays a role in positioning in the y direction during mounting, so that the shift of mounting position in the short side direction of the electronic component can be inhibited.

The present application provides a groove grinding method, a groove grinding device and a storage medium, which inhibit the generation of ungrounded portions after grinding. The groove grinding method is a groove grinding method in which a plurality of grooves provided at a prescribed angular interval on an outer peripheral surface of a shaft are sequentially ground by a grinding wheel, wherein all of the plurality of grooves are ground by a machining process including a control process, the control process including: a control process of determining a position or a region on the outer periphery where a maximum point or a minimum point of vibration of the shaft centeredly aligned exists; a control process of taking a groove existing in the position or the region among the plurality of grooves as a first grinding machining groove on which initial grinding machining is performed, and performing grinding machining on the first grinding machining groove on the basis of aligning the center of the first grinding machining groove with the center of the grinding wheel; and thereafter, a control process of rotating the shaft by a prescribed angular interval with respect to the remaining grooves among the plurality of grooves and performing grinding machining.

The invention provides a photovoltaic asymmetric low-voltage ride-through control method and device and control equipment, and relates to the technical field of photovoltaic grid connection. The method comprises the steps that the voltage of a photovoltaic grid-connected point is acquired, and whether an asymmetric low-voltage fault occurs or not is determined according to the voltage of the photovoltaic grid-connected point; when the asymmetric low-voltage fault is detected, determining a positive-sequence reactive current reference value, a negative-sequence reactive current reference value and a positive-sequence active current reference value based on the distribution sequence of the positive-sequence reactive current, the negative-sequence reactive current and the positive-sequence active current from large to small according to the priority, and setting the negative-sequence active current reference value to be 0; and controlling the photovoltaic inverter according to the positive sequence reactive current reference value, the negative sequence reactive current reference value, the positive sequence active current reference value and the negative sequence active current reference value. According to the priority distribution strategy, the positive sequence voltage of the grid-connected point is rapidly supported, the asymmetry of the power grid is inhibited, and the compatibility of the photovoltaic grid-connected system and the power grid is improved.

The utility model provides a hoisting tool for roll-core transformer production, which belongs to the technical field of roll-core transformer production and comprises a portal frame and a hoisting mechanism arranged at the upper end of the portal frame, and guide components for guiding the hoisting mechanism are arranged on two sides of an inner cavity of the portal frame. The guide assembly comprises guide plates symmetrically arranged on the two sides of an inner cavity of the portal frame, the middle of the hoisting mechanism is slidably connected with a guide rod, the two ends of the guide rod are rotationally connected with guide wheels, the guide wheels are in sliding fit with the adjacent guide plates on the same side, and the two ends of the guide rod are further provided with limiting assemblies used for limiting the guide rod. By means of the hoisting mechanism, horizontal shaking in the hoisting process of the roll-core transformer is eliminated, linearity of a vertical lifting track is guaranteed, and potential safety hazards caused by load deviation are avoided.

The utility model discloses a rotary welding positioning device, including support seat, is provided with rotary positioning unit on the support seat, rotary positioning unit includes rotary frame and rotary drive assembly, is connected with the front top connecting plate on the rotary frame, and the front end of front top connecting plate is installed with the positioning structure, the utility model discloses through rotary drive assembly control rotary frame and carry out 90 degree indexing rotation, make the four edges of covering piece automatic entering welding station in proper order, need not manual repeated adjustment work piece position and attitude, in positioning structure, adopt the lower fixed block and upper sliding block of corresponding setting up, and realize automatic pressure tightly with the help of sliding elastic piece, simultaneously, through the cooperation of the edge hole of thimble section, realizes mechanical lock under the reset action of positioning elastic piece, can effectively inhibit the deviation or separation of covering piece in the welding and rotation process, provides reliable guarantee for the weld forming quality.

The optimal analysis method for the joint position of the vehicle body of the present invention determines the optimal joint position of the component group in the vehicle body model (37). In the optimal analysis method for the joint position of the vehicle body, a joint candidate (P1) is set at a position that is a candidate for joining the component group. For each component group, at least four fixed joint points or fixed joint parts (P5) are selected based on the distance between the joint candidates. The optimal analysis is performed by setting the selected fixed joint points or fixed joint parts and the optimal joint candidates that are the objects of the optimal analysis in the vehicle body model (37). The optimal analysis determines the optimal joint or joint part (P7) for joining the component group.

The utility model relates to the technical field of tunnel construction equipment, and discloses a tunnel arch support multifunctional boom assembly which comprises a three-section type telescopic boom, a two-section type telescopic boom and a support assembly. The three-section type telescopic arm frame is formed by nesting a basic arm, a second-section arm and a third-section arm. A telescopic oil cylinder is arranged in the third-section arm, the left end of a cylinder rod extends out to be connected with the basic arm, and the left end of a cylinder barrel extends out to be connected with the second-section arm. The right end of the cylinder barrel is connected with an oil cylinder pulley block which is matched with an extending steel wire rope to realize the telescopic function of the boom; one end of the two-section telescopic boom is connected with the three-section telescopic boom through the connecting assembly, and the other end of the two-section telescopic boom is connected with the supporting assembly. The supporting assembly comprises a breaking hammer, a supporting frame and a gripper. According to the device, a composite telescopic scheme is adopted, the structure is simplified, synchronous telescopic of the three-section type telescopic arm is guaranteed, multiple systems are integrated to achieve multi-dimensional movement and function combination, the requirement for supporting full-process operation is met, and the equipment universality and construction efficiency are remarkably improved.

The invention discloses an isothermal hot forging forming process and device applied to large wind power main shaft forgings, and relates to the technical field of main shaft heat treatment. And step-by-step forging and pressing forming of the forge piece is realized by matching transmission of a wedge-shaped pressing block group and an inclined wedge surface of a pressed sliding seat, multi-point pressure application of an air hammer power assembly and directional deflection of a rotary power assembly, and the process core is as follows: the forge piece is positioned and clamped after being heated; according to the method, the problems that in traditional hot forging, deformation is uneven, cracking is likely to happen, and toughness is insufficient are solved through structural collaboration and process optimization aiming at the pain points that a large wind power main shaft forged piece is large in size and high in relevance between temperature and deformation quantity, and the large wind power main shaft forged piece is formed through continuous actions of lateral surrounding positioning, overall blowing pressing, multi-point secondary hammering pressing and directional deflection circulation. Forge piece forming precision and mechanical performance are remarkably improved, and meanwhile hot forging production efficiency is improved.

This disclosure provides a technique for suppressing the displacement of an electrode disposed in a catheter. A balloon-type electrode catheter comprises: a catheter shaft (2) having an outer shaft (8) and an inner shaft (10), a balloon (4) disposed on the tip side of the catheter shaft (2), and an electrode (46). The balloon (4) comprises: an outer junction (24), an inner junction (32), a tip-side large-diameter portion (34), a base-side large-diameter portion (36), a small-diameter portion (38) located between the two large-diameter portions and having a diameter smaller than the diameters of the two large-diameter portions, a tip-side inclined portion (40) connecting the tip-side large-diameter portion (34) and the small-diameter portion (38), and a base-side inclined portion (42) connecting the base-side large-diameter portion (36) and the small-diameter portion (38). The electrode (46) is exposed at least in the small-diameter portion (38). After inflation, the balloon (4) deforms by the relative displacement of the outer shaft (8) and the inner shaft (10) in a manner that brings the two inclined portions closer together.

The utility model relates to hydraulic control high accuracy broach technical field discloses a kind of hydraulic control high accuracy broach, including workbench, the outer surface of the workbench is provided with perforation, the top of the workbench is provided with clamping mechanism, the top of the workbench is fixedly connected with I-shaped guide rail, the both ends of the I-shaped guide rail are fixedly connected with water tank, the top of the I-shaped guide rail is slidably connected with the guide rail sleeve block of two symmetries, accurate driving to broach is realized by setting servo hydraulic cylinder cooperation clamping head, and the guiding mechanism of guide rail sleeve block and rotating block is introduced in the process of tool movement, buffering structure is formed simultaneously using water tank and internal honeycomb plate, effectively inhibit the sway and deviation of broach when reciprocating broaching, reduce the impact caused by hydraulic telescopic, significantly improve the stability and precision of processing, prolong the service life of tool.

The invention relates to the technical field of unmanned aerial vehicles, in particular to an overwater unmanned aerial vehicle which comprises a shell, a rotating mechanism, a holding mechanism and a clamping mechanism, the shell is fixedly installed on the ground, the shell enables the aerial vehicle to stay at an initial position through an embedded groove, a buoyancy mechanism is movably installed in the shell, and the buoyancy mechanism is connected with the rotating mechanism. The rotating mechanism is fixedly installed at the lower end of the center of the buoyancy mechanism, the gripping mechanism is fixedly installed above the front end of the buoyancy mechanism, the clamping mechanism is fixedly installed in the middle of the upper end of the buoyancy mechanism, and the winding mechanism is rotatably installed in the center of the bottom of the shell. The rescue device can be rapidly installed, the installation efficiency is improved, the rescue device is not affected by natural factors, a more stable rescue state is provided, then drowning people can obtain multiple acting points, the rescue probability is improved, finally, the whole rescue device can be rapidly retracted, the drowning people can be rapidly pulled back to the shore, and the rescue efficiency is improved. The rescue efficiency is improved.