89 results about "Helical line" patented technology

The application discloses a kind of bundled biaxial skin-core structure tensile yarn spinning processes, specifically including the following steps, step S1: one low modulus high elongation fiber filament one and one low modulus high elongation fiber filament two are unwound by active feeding roller, and are respectively fed into lower layer hollow spindle center tube one and lower layer hollow spindle center tube two, as two core filaments;Step S2: high modulus low elongation fiber filament one is wrapped on the surface of the core filament in positive helical line configuration at lower layer guide hook one;High modulus low elongation fiber filament two is wrapped on the surface of the core filament in reverse helical line configuration at lower layer guide hook two;Form biaxial skin-core structure covering yarn system, and pass through upper layer hollow spindle center tube;Step S3: at upper layer guide hook, the fiber filament yarn with excellent elastic elongation wound on upper layer hollow spindle is bound to the surface of the biaxial skin-core structure covering yarn system with low spiral covering density, to form bundled biaxial skin-core structure tensile yarn.

The present application relates to a flow equalizing device. The flow equalizing device comprises a pipeline (110) and at least two blades (101), wherein the pipeline (110) is cylindrical and has a central axis, the at least two blades (101) are arranged in the pipeline (110), and the at least two blades (101) are arranged along a helical line around the central axis, such that a fluid in the pipeline (110) can be divided into at least two streams of fluid to flow in a helical direction on the cross section of the pipeline (110). The at least two blades (101) are spaced apart from an inner wall of the pipeline (110) and / or the at least two blades (101) are provided with through holes, thereby forming a gap on the cross section of the pipeline, such that the at least two streams of fluid can circulate through the gap. The flow equalizing device of the present application can uniformly distribute a fluid in a circumferential direction of the pipeline, thereby equalizing flow.

The present application relates to a kind of particle implantation equipment and positioning implantation method, the equipment includes frame body, with the implantation tube fixedly connected to frame body;Pusher is installed on the frame body;Particle bin, between the implantation tube and the pusher, when one of the particles is located in the implantation tube and the pusher line, the particle is placed in the particle bin;The circumferential side of the particle is formed with helical line type protrusion along its length direction, and the pusher includes threaded screw-in push rod, the threaded screw-in push rod is driven to rotate and slide and drive the particle to rotate and advance along the length direction of the implantation tube.By the above setting, the position of particle implantation is stable, and displacement is not easily generated, and the adaptability of implantation equipment and particle is high.

The utility model relates to the technical field of miniature lens installation, and discloses a miniature lens capable of being adjusted at a large angle. According to the miniature lens capable of being adjusted at the large angle, the adjusting assembly is adjusted, the tooth cylinder is manually rotated and adjusted, the position of the tooth cylinder is conveniently adjusted, then the angle for installing the lens cylinder is adjusted, a positioning block is pulled to bring a cleaning belt out of a torsional spring to deform when the lens cylinder is installed, and the cleaning belt covers the end of the lens cylinder; after installation, a positioning block is loosened, a torsional spring is reset, a fixing cylinder rotates, a cleaning belt passes through a guide cylinder, the cleaning belt can conveniently see a corner at an opening through a fixing box, and a guide plate slightly lifts the cleaning belt under the elastic action of a volute spiral spring, so that the surface of the lens tube is cleaned. And meanwhile, spiral threads arranged on the surface of the promoting barrel flatten the cleaning belt in the process of promoting the barrel to rotate, the winding process is guaranteed, a positioning block is clamped to an opening of the fixing box, and a lens is conveniently extracted and protected when the lens barrel is installed.

This invention belongs to the field of oil and gas extraction technology and discloses a well-clearing device and its construction method. The well-clearing device includes: a milling column, comprising a cutting shaft section and a helical spline shaft section. The outer circumferential surface of the cutting shaft section is provided with multiple centralizing bands distributed along a helical line. Each centralizing band has a first cutting element and a second cutting element at the chamfered ends at opposite ends along the axial direction of the milling column. The first cutting element is used for forward reaming when the well-clearing device is lowered into the well, and the second cutting element is used for reverse reaming when the well-clearing device is raised into the well; a helical spline sleeve, drivenly connected to the outer circumference of the helical spline shaft section and coaxially arranged with the milling column; and a pushing element, connected to the end of the helical spline sleeve axially away from the cutting shaft section. The pushing element can push the helical spline sleeve axially towards the end closer to the cutting shaft section, thereby driving the milling column to rotate downwards. This invention can optimize the well-clearing reaming construction process and improve the efficiency of reaming construction.

The application discloses a forming gear grinding machine sensitive geometric error identification method for gear evaluation error, which comprises the following steps: establishing a grinding wheel rotary surface parameter model based on gear parameters to be machined; establishing a quantitative mapping analytical model of machine tool geometric error-gear tooth profile / helical line deviation; and identifying sensitive geometric errors affecting the evaluation deviation of the gear tooth profile / helical line. The application can identify key errors affecting the gear surface precision, provide a theoretical basis for subsequent machining compensation, and improve the forming gear grinding error compensation efficiency.

The utility model discloses a shredding machine for recycling lithium batteries. The shredding machine comprises a rack, a box body, a shredding cutter assembly, a driving assembly and a driven assembly, the cutter bodies are distributed on the cutter shaft in the spiral line mode, when materials are shredded, the cutting edges of the cutter bodies can conduct cutting at different points of the materials, cutting force is strong, the materials with large hardness are easily broken, and energy consumption is reduced under the condition that the materials are the same. The cutter body with the spiral structure can smoothly push the materials into the crushing cavity, so that the height of the materials in the center of the crushing cavity is reduced, and the blanking efficiency is improved; and a gap is formed between the cutter body on the cutter shaft and the bearing seat, so that materials are prevented from entering the bearing in the crushing process of the materials in the crushing cavity, and the service life of the equipment is prolonged.

The present invention belongs to the technical field of wind power prestressed towers, and particularly relates to a precast concrete wind turbine tower barrel. The present invention is composed of a plurality of circumferential members spliced by a plurality of precast concrete members. The lateral end faces of the precast concrete members are inclined planes or smooth curved surfaces, and the vertical joint surfaces of the wind turbine tower barrel form regular helical lines. The precast concrete members of the main body of the precast concrete wind turbine tower of the present invention have controllable sizes, are easy to manufacture, convenient to construct, have good structural stress performance, can accelerate the on-site assembly progress of the precast members, reduce the construction cost, and are applicable to onshore and offshore wind turbine towers.

The utility model provides a square cap freezing mesh belt which comprises a horseshoe mesh belt, the horseshoe mesh belt comprises horseshoe connecting plates, a round bar and a spiral line, the horseshoe connecting plates are connected to the two ends of the round bar, each horseshoe connecting plate is of a semi-closed bent structure, and each bent structure is formed by connecting a baffle side, a bent side and a fixed side in an end-to-end mode. The bent side of any horseshoe connecting plate is arranged in a cavity formed by the bent structures of the adjacent horseshoe connecting plates, and one end of each round bar sequentially penetrates through the baffle side of one horseshoe connecting plate, the bent side of the adjacent horseshoe connecting plate and the fixed side of the horseshoe connecting plate and is fixed to the fixed side. The square cap is arranged at the end, close to the rotating dragon, of the round bar, the abutting face of the square cap and the blocking strip assembly arranged on the rotating dragon is a perpendicular plane, the face, making contact with the blocking strip assembly in the moving direction, of the square cap is a plane, the stress area of the blocking strip assembly is large, the blocking strip assembly and the mesh belt are not prone to abrasion deformation, and the conveying efficiency is improved.

The invention relates to a method for sheathing elongated goods, such as cable sets in particular, wherein in the method an adhesive tape is provided comprising a textile carrier and an adhesive compound applied to at least one side of the carrier, and the elongated goods are sheathed with the adhesive tape, wherein a tensile stress in the longitudinal direction is applied to the adhesive tape before it is applied to the elongated goods, by which the adhesive tape is lengthened so that in the lengthened state it is guided in a helical line around the elongated goods and is fixed on them in the lengthened state.

The utility model discloses engineering machinery multiway valve body accessories relates to multiway valve technical field, including main valve body, the both sides of main valve body are provided with a plurality of oil inlet and oil outlet, the oil inlet and oil outlet outside all are fixedly connected with helical line shunt passage, the inner chamber of helical line shunt passage is towards the oil inlet one side and is opened with the liquid inlet tapering runner, when oil liquid is in through oil inlet and oil outlet send, all first pass through helical line shunt passage, and the oil liquid of passing through helical line shunt passage first pass through liquid inlet tapering runner, effectively reduced the impact force of oil liquid, improved the stability of oil liquid. Oil liquid continues to flow in helical line shunt passage, gradually enters the export diffusion chamber, and the design of export diffusion chamber makes oil liquid can diffuse steadily when flowing out, then is sent into main valve body and is sent into oil equipment, further reduces the turbulent flow and energy loss of oil liquid.

The utility model relates to an agricultural machine, namely a pepper annular gap screening machine, including feeding port (1), crushing bin (2), screening device (3), the main part of screening device is a cylinder (12), and the cylinder is placed on the carrier roller (8) above frame (5), and can rotate under the drive of carrier roller, its characterized in that: the cylinder wall of screening device cylinder (12) distributes multilayer annular screen line (13), and the screen gap (14) between each layer annular screen line (13) and adjacent annular screen line (13) are all with cylinder axis as center. Advantageous effect is: changed the direction of the screen gap of existing screening device, and the screen line is made with the reinforcing bar with smaller diameter than the screen gap, and the screen gap area proportion increases fold; the machine weight reduces fold, rotates more flexible, and energy consumption reduces greatly; screen line transverse distribution restricts material longitudinal sliding; especially adopt helical screen line, can push material along helical line, equivalent to increase the screening distance, and screening effect is enhanced significantly.

The invention provides a novel grain crusher for a silage maize harvester, and relates to the technical field of grain crushers, the novel grain crusher comprises a shell frame, one end of the top of the shell frame is provided with a pair of first bearing seats, one side of the top of the shell frame is provided with a pair of second bearing seats, and a main transmission roller is rotatably arranged between the pair of first bearing seats; a driving screw roller is mounted at the outer end of the main transmission roller, a secondary transmission roller is rotationally arranged between the pair of second bearing seats, a driven screw roller is mounted at the outer end of the secondary transmission roller, and transverse teeth are designed at the outer ends of the driving screw roller and the driven screw roller. According to the invention, the transverse tooth spiral lines on the surfaces of the driving screw roller and the driven screw roller are designed into left and right opposite structures, and the spiral directions are the middle part of the roller body, so that when the driving screw roller and the driven screw roller are matched to crush seeds, a force for approaching the middle part of the roller body is applied to the seeds; therefore, impact noise caused by splashing of the crushed seeds to two ends is avoided, and the wire softening effect is improved.

The utility model discloses a concrete curing device for in-situ extension of a mountain tunnel, which comprises a pipeline, a spiral through groove is formed in the side wall of the pipeline along the axis direction, and a water pipe is arranged in the pipeline in a penetrating manner; the driving rails are arranged in the direction, corresponding to the spiral line, of the spiral through groove, and the driving rails are arranged on the two sides of the spiral through groove; one end of the water pipe is installed on the pipe head fixing assembly, a driving wheel is installed on the pipe head fixing assembly, the driving wheel is installed on the driving track, and a speed regulator is installed on the driving wheel; the positioning module is mounted on the pipe head fixing assembly; a support assembly; wherein a nozzle is mounted at one end of the water pipe; the pipeline comprises a straight section and a bent section. According to the utility model, the position of the nozzle is adjusted through the arrangement of the positioning module, so that the maintenance condition of the device on each position is ensured, the maintenance efficiency of the device is conveniently adjusted according to the field environment, and the efficiency of the maintenance device is greatly improved.

This invention relates to the field of aero-engine technology, and discloses a composite material thrust reverser cascade configuration suitable for winding processes and having a non-orthogonal grid, as well as its preparation method. This invention employs a continuous fiber winding process to prepare the thrust reverser cascade, ensuring fiber continuity, improving the stiffness and strength of the cascade, facilitating increased production efficiency, reducing production costs, and improving material utilization. Furthermore, by improving thrust reverser aerodynamic efficiency and reducing the thickness of the helical cascade, the weight of the thrust reverser cascade can be reduced. This invention uses a helical first and second helical cascades, which are obliquely positioned at a predetermined angle to the engine axis. This results in a swept-back aerodynamic layout of the helical cascades relative to the incoming flow through the thrust reverser cascade. The resulting swept-back cascade naturally produces aerodynamic effects of increased lift and reduced drag, improving thrust reverser aerodynamic efficiency.

The present application relates to a kind of track profile array eddy current detection sensor, for detecting rail head tread and inner side, can be adaptive to the form of rail under different degree of wear and carry out detection, including shell, elastic spiderweb membrane and the eddy current detection component of being arranged on elastic spiderweb membrane.First shell portion and second shell portion rotatably connected and form the open shell of being foldable, the edge of elastic spiderweb membrane is fixedly connected in the opening edge of shell, is interwoven by several helical lines and several amplitude lines, and heavy back pad and elastic lifting rope are arranged on each interwoven point and can be followed by dynamic traction;Eddy current detection component includes several orthogonal eddy current detection lines and is arranged on interwoven point;When detecting, eddy current detection component realizes the three-dimensional follow-up of track tread and inner side under the action of shell pressure, elastic spiderweb membrane elasticity and the natural gravity of heavy back pad, can be accurately profiled to convex surface and concave surface of tread and inner side, improve detection sensitivity.

The utility model relates to a drilling and reaming drill which comprises a drill handle and a drill bit body arranged at the front end of the drill handle. The drill bit body comprises three drill edges evenly distributed with the center line of the drill bit body as the central axis, the drill edges are spiral, one side of each drill edge is a main cutting edge, the other side of each drill edge is a groove back face, and the main cutting edge of one drill edge and the groove back face of the other drill edge are jointly matched to form a chip containing groove. The three chip flutes are also spirally distributed among the drill edges, and the groove-shaped angles of the chip flutes are in an open V shape on the section perpendicular to the spiral lines of the drill edges; and chisel edges which are in one-to-one correspondence are respectively formed among the main cutting edges, a drill tip of the drill bit main body is jointly formed among the three chisel edges, and each chisel edge is in an arc shape. According to the reaming drill disclosed by the utility model, the three drill edges are matched to realize drilling, so that the feeding amount is increased, and a hole wall is sleeked and is similar to reaming while drilling is realized, so that efficient and high-precision hole processing is realized, and the processing time is greatly shortened.

The present invention discloses a method for solving the dispersion curve of ultrasonic guided waves of a multilayer helical structure, comprising establishing a 3D model of a multilayer helical structure in which each helical line has a single pitch length; meshing the cross section; calculating the mesh size in the mesh sweep direction; mesh sweeping each helical line; solving the unit stiffness matrix and unit mass matrix of each node, using a rectangular coordinate system for straight lines and a spiral coordinate system for spiral lines; assembling the cross-sectional overall stiffness matrix and cross-sectional overall mass matrix of each line, and assembling the pitch overall stiffness matrix and pitch overall mass matrix; periodically replicating and expanding the pitch overall stiffness matrix and pitch overall mass matrix of each line to assemble the overall stiffness matrix and overall mass matrix of the multilayer helical structure; solving the wave number, group velocity, and phase velocity; and matching the guided wave eigenvectors based on orthogonality. The present invention can achieve a fast and accurate solution to the dispersion curve of a multilayer helical structure composed of different pitches, handedness, sizes, or materials.

This invention discloses a symmetrical non-rotational composite material oblique mesh structure suitable for automated molding, comprising an upper frame, a lower frame, and bidirectional helical ribs; the upper frame, lower frame, and bidirectional helical ribs are integrally molded structures, and the structural materials used for the upper frame, lower frame, and bidirectional helical ribs are composite materials; the bidirectional helical ribs include two mutually symmetrical ribs, and the center line of the outer contour surface of each rib is a helix with equal pitch, equal helix angle, or geodesic. This invention further discloses methods for determining the center line of ribs used in various typical symmetrical non-rotational structures applied in aerospace engineering. The oblique mesh structure of this invention is rationally designed, lightweight, and suitable for automated mass production.

The present application relates to a kind of block transverse tumbling longitudinal conveying belt shaft and conveying module, including oppositely arranged power hub shaft, spiral shaft, dispersed conveying roller, dispersed conveying roller includes hollow cylinder and the plurality of toothed belts being axially arranged on its surface along hollow cylinder, each toothed belt ring is distributed on the surface of hollow cylinder, power hub shaft is connected with one end of hollow cylinder, and spiral shaft is engaged with each toothed belt.The present application can be small, noiseless, use helical line solid wheel and non-metal toothed soft band engagement, create the new form of mechanical transmission, realize the longitudinal motion of the block being sent simultaneously doing rotation, so that material is evenly distributed on the conveyor belt, to meet the requirement of visual full surface coverage;At the same time, compared with the current vibration longitudinal conveying mode, the present application transports long distance, and equipment reliability is high, it is an independent operation mechanism, and other equipment is strong, can be used as standard parts in multiple scene mode, with great application value.

Fermentation or digester (5) with a pump or agitator mount (1), wherein the agitator mount (1) is attached to a vessel wall (51) by means of a wall mount (2) in such a way that the weight force acting on the agitator mount (1) is at least partially absorbed by the vessel wall (51), characterized in that the vessel wall (51) is essentially cylindrical and is formed from a strip of strip material running along a helical line on the cylindrical shell, wherein the side edges of the strip material are connected by means of a folded-over hem and the pump or agitator mount (1) is suspended on the hem.

The invention discloses a miniature continuum mechanical arm and a spiral line obtaining method thereof, belongs to the technical field of miniature machinery, and aims to solve the problem that high compliance and high rigidity cannot be considered in the prior art. Due to the elastic characteristic of a spiral band, when other parts give out actions or force for driving the whole mechanical arm to bend, a bent arm body can well adapt to driving force and generate expected continuous deformation, and compliance and rigidity are both considered on the premise that the radius of the arm is extremely small; due to the fact that force transmission type contact is carried out at multiple positions between the first spiral belt and the second spiral belt, the action of the shaft arm can be effectively transmitted, and the high-rigidity foundation is met; the shaft arm acts to enable the force transmission contact points between the spiral belts to have the tendency of slipping, mutual slipping between the spiral belts can be avoided through the further arranged anti-slipping structure, the transmission loss of the shaft arm action along the bent arm body is greatly reduced, and then high compliance and high rigidity are both considered on the premise that the arm radius is extremely small.

The utility model discloses a fin type air heat exchanger, and relates to the technical field of heat exchange equipment. Comprising two tube plates and a heat exchange tube bundle, the heat exchange tube bundle is fixed between the two tube plates, and the heat exchange tube bundle is composed of a plurality of heat exchange tubes which are arranged in parallel. The heat exchange pipe comprises a pipeline, in-pipe fins and out-pipe fins, the in-pipe fins are concentrically nested in the inner wall of the pipeline and can allow fluid to pass through the hollow fluid channel, the out-pipe fins are concentrically nested in the outer wall of the pipeline, the in-pipe fins are of a spiral inclined structure, the spiral line is parallel to the axis direction of the pipeline, and the in-pipe fins and the out-pipe fins are arranged in parallel. And the inclination of the rib part of the in-pipe fin relative to the spiral line is not more than 25 degrees. Due to the double design of the inner fins and the outer fins, the heat transfer process is optimized, and heat can be quickly distributed in the whole air heat exchanger.

The utility model discloses a pressure pipeline pressure bearing detection device which comprises a workbench, a containing cavity is formed in the workbench in a penetrating mode, two sets of notches with upward openings are formed in the containing cavity, the inner walls of the notches are rotationally connected with two-way lead screws, and the positions of different spiral lines of the two-way lead screws are connected with clamping plates in a penetrating and threaded mode respectively. A supporting base plate is slidably connected to the center of the workbench, and an adjusting lead screw is in threaded connection with the interior of the supporting base plate. A limiting plate is fixedly connected to the outer surface of the end, close to the rotating handle, of the workbench, a sliding block is slidably connected into the limiting plate, and a transparent plate is fixedly connected to the top of the sliding block. According to the pressure pipeline pressure-bearing detection device, the distance between a pressure pipe fixing point and a pressure base plate is far, so that the influence of a clamping plate on the pressure test of a pressure pipe is reduced, the pressure detection structure is more accurate, and meanwhile, a transparent plate is mounted above the workbench, so that the purpose of shielding fragments of the pressure pipe is achieved.

The invention discloses a twisting preparation device and method for continuous fiber reinforced 3D printing composite filaments. The twisting preparation device comprises a rotating platform, a winding spindle, a containing cavity, first guide wheels distributed in a staggered mode, a diameter control mold, a cooling system and a filament collecting mechanism. The rotating platform drives the spool to rotate around a shaft, the winding spindle limits a twisting intersection below the liquid level of resin, and a pumping effect is generated when fibers are gathered into a spiral line bundle from a loose bundle to achieve deep impregnation; a pultrusion cavity and a penetrating-out cavity of the diameter control mold are used for performing radial compaction and shape-preserving sizing on the tows in sequence; and the cooling system rapid locking structure and the second guide wheel correct the wire collecting posture. Impregnation, twisting and shaping are integrated, the porosity is low, the wire diameter is uniform, and the printing precision and mechanical property are remarkably improved.

This invention discloses a combined turning, milling, drilling, boring, honing, and broaching machine tool and its processing technology, comprising a bed, spindle box, mechanical C-type center rest, hydraulic C-type center rest, four-pin centering center rest, tailstock, turning and milling cutter post system, tool post three-axis feed system, oiler, guide bracket, tool feed system, tool holder rotary indexing box, tool head radial feed system, tool holder, etc. This invention integrates turning, milling, drilling, boring, honing, and broaching processes, designing a machine tool that integrates turning, milling, drilling, boring, honing, and broaching processes and procedures. It meets the processing requirements of key processes for long pipes, has a small footprint, high output ratio, and can complete the machining of inner and outer diameters and internal helical lines (rifling) in a single setup, reducing auxiliary time and labor intensity, lowering costs, and offering high efficiency, high precision, energy saving, and environmental protection.

Propulsion devices that provide increased propeller efficiency when operating outside of an optimal advance ratio are described. In one example, a propulsion device includes a hub having a curved surface extending around and along a rotation axis of the hub. The propulsion device can further include two or more rows of blades extending radially outward from the curved surface and including a first row of blades having a first blade and a second row of blades having a second blade that is angularly and axially offset from the first blade on the curved surface. A first centerline of the first blade and a second centerline of the second blade each intersect with a helical line that extends along the rotation axis of the hub. The first blade and the second blade collectively form a helical pattern of blades that projects radially outward from the curved surface along the helical line.

Threaded tubular connector for an oil and gas well casing obtained by fitting a male and a female tool joint, which, starting from the free edge (19) of the male tool joint, comprises in succession: an inner metal-to-metal seal (25, 26), a first threaded portion (16a, 18a), an intermediate shoulder (22, 24), an intermediate metal-to-metal seal (27, 28), a second threaded portion (16b, 18b), the free edge (19) being at a non-zero axial distance (d) from the female tool joint, each of the threaded portions comprising helical lines having a load flank, a thread crest, an engagement flank and a thread root, such that the load flank pitches (LFLp1, LFLb1) and the engagement flank pitches (SFLp1, SFLb1) of the first threaded portion, and correspondingly the load flank pitches (LFLp2, LFLb2) and the engagement flank pitches (SFLp2, SFLb2) of the second threaded portion, satisfy the condition: [Mathematical formula 12] SFLb1 = LFLb1 = SFLb2 = LFLb2 = SFLp1 = LFLp1 = SFLp2 = LFLp2.

The utility model discloses a tensile wire cable, which comprises a protection structure, a tensile structure installed inside the protection structure, a conductor structure installed inside the tensile structure, a waterproof film installed inside the protection structure, the waterproof film made of polyvinyl chloride, and a tensile strip made of polyester fiber. The polyester fibers have excellent tensile performance, the tensile strips can effectively bear and disperse tensile force and prevent the structure from being deformed or damaged due to stress, the spiral lines are wound on the surfaces of the tensile strips, friction and abrasion of the tensile strips can be reduced, the service life of the tensile strips is prolonged, the spiral lines are made of the aramid fibers, the surfaces of the aramid fibers are smooth, the friction coefficient is low, and the service life of the tensile strips is prolonged. A tensile strip is installed in the waterproof film, a spiral line is arranged on the outer side wall of the tensile strip, a limiting block is installed at one end of the spiral line, anti-skid lines are arranged at the top end of the limiting block, and a limiting groove is formed in the surface of the spiral line.

The present application relates to the field of well repair tool, disclose a kind of hydraulic tong main tong automatic reversing device, it includes lifting type guide mechanism, reversing screw sleeve mechanism and limiting mechanism;Lifting type guide mechanism includes fixed vertical cylinder, lifting drive cylinder, sliding cylinder and guide plate, guide plate includes upper guide plate and lower guide plate;Reversing screw sleeve mechanism includes reversing screw, sleeve, cross bar and guide wheel, reversing screw includes stem and rod base, stem is equipped with several same pitch helical line, rod base is equipped with the opening slot of accommodating main tong reversing knob, sleeve inner wall is equipped with the helical groove matched with helical line;Limiting mechanism includes limiting casing, middle plate and support column, limiting casing is equipped with vertical guide slot.The present application realizes the hydraulic tong main tong automatic reversing function, device is divided into fixed structure and follow-up structure two parts, with the outstanding characteristics of simple structure, easy assembly, smooth operation.