172results about How to "Large clamping range" patented technology

The invention relates to a pneumatic clamping mechanism which comprises a chuck body, an air cylinder, a plurality of clamping mechanisms and a guiding mechanism, wherein a cavity for placing the guiding mechanism is formed at one side inside the chuck body; sliding chutes for placing the plurality of clamping mechanisms are formed in the end part of the chuck body; a push rod is connected onto a piston rod of the air cylinder; one sliding block group A is arranged at each of two ends of the push rod; each clamping mechanism comprises a clamping block arranged in the corresponding sliding chute; a sliding block group B is connected to the bottom end of each clamping block; the guiding mechanism comprises guide rails A, guide rails B and a crank; the guide rails A are arranged in the cavity; the sliding block groups A are in inserted fit with the insides of the guide rails A; two ends of the crank are respectively hinged to the sliding block group A and the sliding block group B which are positioned at the lower end of the same sliding chute. The pneumatic clamping mechanism disclosed by the invention has the advantages of consisting of the air cylinder and a crank sliding block mechanism, being simple in mechanical motion and integral structure, and being easy to process; a clamping block is clamped by the motion of pushing the crank sliding block mechanism through the air cylinder; higher precision can be obtained; meanwhile, the pneumatic clamping mechanism is quick in clamping process, so that the working efficiency is improved.

The invention discloses a clamping mechanical arm with a self-adjusting clamping force. The clamping mechanical arm comprises a motor, the inner circumference of a vertical pipe is fixedly connected to the outer circumference of the motor, the upper end of a rotating shaft of the motor is fixedly connected with the lower end of a screw rod, a screw nut is installed on the outer circumference of the screw rod in a threaded mode, a bearing of the outer circumference of the screw nut is connected with the inner circumference of a sleeve pipe, a first limiting device for limiting the rotation of the screw nut is arranged on the inner side of the sleeve pipe, the upper end of the screw rod is connected with the lower end of a telescopic shaft, the upper end of the telescopic shaft is fixedly connected to the middle of the top side of a rotating plate, a bearing of the top side of the rotating plate is connected with the bottom side of a coaxial first helical gear, and a second limiting device is arranged between the rotating plate and the first helical gear. According to the clamping mechanical arm, the structure is simple, the conception is ingenious, the linear moving clamping and theshearing moving clamping are combined, thus the advantages and disadvantages of the two clamping modes are complemented with each other, a large clamping range is retained, meanwhile the volume can be adjusted, convenient use is achieved in a narrow space, two clamping structures are driven by one motor, the structure is simpler, the production cost is saved, the market demand can be met, and theclamping mechanical arm is suitable for popularization.

The invention discloses an industrial robot clamp and further discloses an industrial robot adopting the industrial robot clamp as a tail end actuating mechanism. The industrial robot clamp comprisesa clamping part. The clamping part is in a ring shape and is formed by oppositely closing two semi-ring-shaped clamping arms; the industrial robot clamp further comprises a driving part for driving the clamping part to be opened and closed; a plurality of sliding cavities are circumferentially and evenly distributed in the clamping arm, and the bottoms of the sliding cavities are located on the inner circumferential wall of the clamping part and are made of elastic materials; and pistons capable of sliding in the radial direction of the clamping part are transversely arranged in the sliding cavities, each piston and the bottom of the corresponding sliding cavity form an airbag with airtightness, and the airbags are filled with air, and electromagnets are arranged in the pistons. The limitation that the clamping range of an existing industrial robot clamp is limited, and the existing industrial robot clamp has special purposes is overcome, the clamping range is wide, and applicability is high.

The invention discloses a parallel clamping device and method for a robot end. The parallel clamping device for the robot end comprises a driving air cylinder, a parallel clamping mechanism and two end clamping mechanisms, wherein the two end clamping mechanisms are arranged on the two sides of the parallel clamping mechanism respectively, and the two ends of the driving air cylinder are fixedly connected with the two end clamping mechanisms respectively. The parallel clamping method for the robot end comprises the steps that the two end clamping mechanisms are symmetrically arranged on the two sides of the parallel clamping mechanism respectively, and are connected with the parallel clamping mechanism through adjusting rods, the two ends of each adjusting rod are hinged to the parallel clamping mechanism and the corresponding end clamping mechanism, a rotating base is used in cooperation so that when the driving air cylinder works, the two end clamping mechanisms can be driven to synchronously run, and clamping or loosening of workpieces can be achieved. According to the parallel clamping device for the robot end, the mode that one driving air cylinder is used for driving the two end clamping mechanisms is adopted, the rotating base and the adjusting rods are used in cooperation, synchronous operation of the two end clamping mechanisms is achieved, clamping is stable, alignment performance and synchronism are high, the accuracy rate of clamping is high, and production efficiency and the degree of automation of a production line can be effectively improved.

The invention discloses a high temperature tensile clamp for tubular products, which is mainly used for a tubular product test sample meeting the detection requirements of high temperature tensile properties. GB / T4338-2006. The high temperature clamp comprises: an outer sleeve, an ejector rod and an inner sleeve, wherein the bottom end of the inner sleeve is mounted on one large-diameter end of a connecting hole of the outer sleeve, and is provided with a mounting hole; a group of guide grooves are formed at the circumferential edge of the mounting hole, and an included angle between the bottom of each guide groove and the central axis of the hole is greater than 0 degree; and a group of clamping titles as many as the guide grooves are each provided with a mounting portion and a clamping portion; the mounting portions are mounted in such a manner of being matched with the guide grooves; the slope of the bottom edge of each mounting portion is consistent with that of the bottom edge of the corresponding guide groove; and each clamping portion is provided with a cambered clamping surface in contact with test piece. The high temperature tensile clamp is not only capable of providing a reliable clamping state to guarantee the detection quality of non-proportional extension strength Rp0.2, but also has large clamping range coverage, so that by using one set of clamp, the use of tubular product test samples within a standard diameter range in high temperature tensile tests can be satisfied.

The invention relates to the field of machining and detection, in particular to an in-machine roundness detection method. The in-machine roundness detection method involves a base, a first rotating shaft, a second rotating shaft, a circular hoop, a clamping buckle, a first half ring and a second half ring, wherein the first half ring is arranged on the circular hoop through the first rotating shaft; the second half ring is connected with the first half ring through the clamping buckle; the circular hoop is arranged on the base through the second rotating shaft; supporting legs are arranged on the lower end surfaces of the circular hoop and the first half ring. According to the in-machine roundness detection method, a three-dimensional measurement point, acquired by a three-coordinate measurer, on a cylinder is projected to a plane, and a circle center of a circle with the minimum area is searched by an iteration method, so that the calculated amount of searching is greatly simplified; an initial value of the circle center is determined by the least square method according to the projected measurement point, so that the search process under a determined attitude is quicker; by the selection of a center moving direction and a center moving step length, the number of searching times is reduced, and the searching precision is improved.

The invention aims at providing a power slip capable of realizing on-line quick change of clamp tooth boxes and automatic lubrication, which can realize the quick change function of the slip, increase the pipe diameter clamping range and improve the working efficiency. The power slip comprises a slip housing, a slip upper cover, a slip body and the clamp tooth boxes, wherein a slip upper cover plate is connected with an upper cover pin shaft base through a pin shaft, the upper cover pin shaft base is in bolted connection with the slip housing, the slip body is connected with a swing arm of a lifting oil cylinder through a lifting shaft, the swing arm of the lifting oil cylinder is fixed on a rotating shaft of a left lifting oil cylinder and a right lifting oil cylinder, the left lifting oil cylinder is in bolted connection with the slip housing, the three clamp tooth boxes are connected with the slip body through clamping blocks, and the axial fixing is realized with a clamping plate on the slip body through a convex edge. By adopting the power slip, the degree of automation of the clamping process of the slip is improved, the automation of the clamping process is completely realized, the labor intensity of a worker is reduced, and the safety guarantee is improved. The clamping of the slip and the centering are performed step by step, the working quality is ensured, the quick change function of the slip is realized, the pipe diameter clamping range is increased, and the working efficiency is improved.

A blind fastener has a setting head portion and a shank portion having one end connected with the setting head portion and an opposite end with an internal thread or a threaded bolt receptacle. The shank has a sidewall with an outside diameter smaller than the diameter of the setting head portion, and is configured for close reception in an aperture of the workpiece prior to being upset. The sidewall has a deformation area that is disposed between the setting head portion and the internal thread or the threaded bolt receptacle, and is upset radially outwardly to secure the fastener to the workpiece. The deformation area includes a central circumferential region which provides sole weakening for the sidewall.

A blind fastener has a setting head portion and a shank portion having one end connected with the setting head portion and an opposite end with an internal thread or a threaded bolt receptacle. The shank has a sidewall with an outside diameter smaller than the diameter of the setting head portion, and is configured for close reception in an aperture of the workpiece prior to being upset. The sidewall has a deformation area that is disposed between the setting head portion and the internal thread or the threaded bolt receptacle, and is upset radially outwardly to secure the fastener to the workpiece. The deformation area includes a central circumferential region which provides sole weakening for the sidewall.

A threaded blind insert includes a shank with a bore therethrough and a head at one end and a threaded region at the opposite end. The shank includes a weakened deformable portion created by a reduced outside diameter of the shank. A reinforcement collar integral with the shank is located in the middle of the deformable portion which provides a rigid area and creates bulges in the deformable portion on either side of the collar. A flange is located adjacent to the underside of the head and centers the insert when it is set in a workpiece mounting hole. The reinforcing collar may be replaced by a band of material of greater hardness on the deformable wall which can be created by heat treatment.

The invention relates to a shaft holder comprising a V-shaped block, a shell, a V-shaped block compressing screw and a left and right shell body locking latch. The V-shaped block comprises a left fixed V-shaped block and a right movable V-shaped block, the shell comprises a left shell body and a right shell body, the left fixed V-shaped block and the right movable V-shaped block are wrapped by the shell body, the left fixing V-shaped block is fixedly connected with the shell body, mesh teeth in cross banding are evenly arranged on a teeth mouth portion corresponding to the left fixed V-shaped block and the right movable V-shaped block, so that the left fixed V-shaped block and the right movable-V shaped block can be meshed correspondingly to adaptive to diameter range changes of different clamping targets; the shaft holder is capable of solving the problem that the existing simple shaft holder cannot lock tightly and is narrow in application range, and meeting actual demand in real life or industry production.

An electrostatically acturated miniature clamper is composed of a drive electrode, a flexible structure which is a continuous S-shaped one connected between the drive electrode and a movable comb, the movable comb, a fixed comb, a limit block, a miniature clamping arms and a bottom plate, and features that the static electricity is used as the powr source. Its advantages are high response speed and clamping force, and easy control.

The invention discloses a simple and practical mechanical arm which comprises a frame, a base, a supporting seat, a second rotary layer and an arm body. A supporting rod is fixedly installed under the frame, and the frame is connected with an air cylinder through the supporting rod. A travel switch is fixedly installed on the left side of the supporting rod. A telescopic rod is installed on the oblique upper portion of the supporting seat, and the supporting seat is connected with the arm body through the telescopic rod. A supporting arm is fixedly installed on the right side of the second rotary layer, and the frame is connected with the supporting arm through the second rotary layer. The arm body is connected with the supporting arm through a rotating device, and a wrist is installed on the oblique lower portion of the arm body. The arm body is connected with a manipulator through the wrist. According to the simple and practical mechanical arm, suckers are evenly arranged on the surface of the manipulator, when a round object is clamped, the object is sucked through the suckers, thereby being prevented from falling, unnecessary troubles are avoided, and the simple and practical mechanical arm is simple in structure and easy to operate.

The invention discloses a split type inverted wedge type power chuck for a machine, which mainly comprises a chuck body, a sliding seat, a T-shaped key, a clamping jaw, a dustproof cover, a sliding shaft, a location key, a regulating pad and a pull rod, wherein an integral semi-closed structure of a guide groove is changed into an open surface, thus groove width precision and smooth finish of a guide surface are improved, and movement precision and service life of the chuck are improved; and by adopting an inverted cone chuck, the split type inverted wedge type power chuck has replaceability. By adopting round corner transition, the diameter range of clamping a workpiece is increased. A packing and a guide block of the chuck are separately manufactured, and then assembled into a whole, thus the split type inverted wedge type power chuck has the advantages of compact structure, convenience for maintenance, large clamping range, convenience for regulation, adjustable clamping force, higher automatic centering precision and the like.

The invention relates to a part machining turnover device. The device comprises a base, a supporting platform, turnover supports, a turnover box and an upper clamping mechanism; the supporting platform is located over the base, a hydraulic cylinder is arranged on the base, the output shaft end of the hydraulic cylinder is connected to the bottom of the supporting platform, the positions, on the two sides of the supporting platform, of the base are each connected with one turnover support, the two outer side walls of the turnover box are connected to the turnover supports on the two sides through rotation shafts, one rotation shaft is connected with a servo motor, the upper clamping mechanism comprises two opposite chucks, two air cylinders connected with the chucks and lengthening rods, the two air cylinders are mounted on two inner side walls of the turnover box, and the air cylinders are connected with the chucks through the lengthening rods; buffer mechanisms are arranged on the inner walls of the chucks.

The invention discloses an anti-fatigue pre-twisted protective bar. The protective bar comprises two spiral pre-twisted wire sheets; and the centers of the two pre-twisted wire sheets are twisted to form an enclosed circular tube. The anti-fatigue pre-twisted protective bar uniformly disperses pressure borne by a bearing seat to two sides without stress concentration; the stress strain of a lead at the position is reduced, the anti-fatigue property is improved, and the fatigue damage of the lead is effectively avoided; in addition, the invention has the advantages that the anti-fatigue pre-twisted protective bar can be installed manually, and is easy and quick to operate.

The invention relates to the technical field of machining devices, in particular to an improved steel pipe clamping device with a horizontal adjustment function. The improved steel pipe clamping device comprises a base, sleeve rods, lifting rods, a transverse rod, a spiral rod, an upper clamping head, an elevation rod, a lower clamping head and a fine adjustment assembly. The bottom of the base is larger than the upper portion of the base. The sleeve rods are arranged on the left side and the right side of the base. Vertical open holes are formed inside the sleeve rods. The lifting rods are arranged inside the vertical open holes. The transverse rod is arranged on the upper portion of the lifting rods. The upper clamping head is arranged at the lower end of the spiral rod. The elevation rod is arranged one side of the transverse rod. The lower clamping head is arranged on the two sides of the base. Fixed columns are arranged on the base. Grooves are formed in the lower clamping head. The grooves are sleeved with the fixed columns. A rotating gear is further arranged on the base, and a vertical gear strip is arranged on the lower clamping head.

The invention provides a feeding and discharging robot. The feeding and discharging robot comprises a base, a lifting air cylinder, a rotary air cylinder, an air cylinder installation plate, a balanceweight, a horizontal air cylinder, a finger installation plate and pneumatic fingers. The pneumatic fingers are installed on the pneumatic finger installation plate, the finger installation plate isarranged on the horizontal air cylinder, the horizontal air cylinder is installed on the air cylinder installation plate, the balance weight is arranged on the air cylinder installation plate, the aircylinder installation plate is arranged on the rotary air cylinder, the rotary air cylinder is arranged on the lifting air cylinder, and the lifting air cylinder is arranged on the base. The liftingair cylinder, the rotary air cylinder and the horizontal air cylinder independently or synergistically move to control pincers on the pneumatic fingers to complete grabbing and releasing of parts, thewhole process is completely automatic, the production efficiency of feeding and discharging can be improved, and the labor intensity of a worker is reduced.

The invention provides a hardware clamp capable of adjusting clamping degree and clamping hardware in various shapes, and relates to the technical field of hardware. The hardware clamp comprises a base, wherein a screw rod penetrating through and extending to the right side of the base is rotationally connected to the middle of the base; a motor is fixedly connected to the right side of the screwrod; and screw blocks are in threaded connection with the two sides of the screw rod. According to the hardware clamp capable of adjusting the clamping degree and clamping the hardware in various shapes, a rubber sleeve and turbid liquid are used in cooperation, when a hardware material is clamped, the rubber sleeve can change along with the shape of the hardware material, the rubber sleeve and the turbid liquid are attached to the hardware material to form corners, the turbid liquid can extrude and move a piston block towards the outer side when being extruded, and the rubber sleeve is prevented from being extruded to be broken; and after the hardware material and the rubber sleeve are extruded and attached, a conductive column is electrified, the turbid liquid can become a solid state after being electrified, and therefore the hardware material is firmly clamped, the effect of clamping various shapes is achieved, the clamping range is wide, the production cost is saved, and the production efficiency is improved.

The invention relates to machine tool clamping, and provides a four-claw automatic centering chuck. The four-claw automatic centering chuck comprises a rotary base. The rotary base is provided with amounting hole. The four-claw automatic centering chuck further comprises two sets of two-claw clamping mechanisms. Each two-claw clamping mechanism comprises two sets of clamp claw assemblies and a screw. The screws of the two sets of two-claw clamping mechanisms cross with each other. Each clamp claw assembly comprises a rotary clamping claw and a drive part, and the rotary clamping claws are distributed on the mounting hole. The two rotary clamping claws of each two-claw clamping mechanism are arranged oppositely, and the moving paths of the two rotary clamping claws of each two-claw clamping mechanism are located on the same straight line. In each two-claw clamping mechanism, one rotary clamping claw is in right-hand thread connection with the screw, and the other rotary clamping claw is in left-hand thread connection with the screw. The invention further provides a machine tool which comprises the above chuck. The rotary clamping claws of the chuck are synchronously closed or opened under the action of the drive parts, clamping force is constant and can be adjusted according to the actual condition, and when clamped, a workpiece can move and penetrate from the middle of the rotary base; and the clamping range is wide, the speed is high, and the locating precision is high.

The invention relates to an integrated type automatic thread screwing-unscrewing device, in particular to an automatic screwing-unscrewing device for a drill rod of a drill, and belongs to the technical field of drilling equipment. The device comprises a mounting member, a swing shell and a fixed shell. The mounting member is provided with a plurality of guide rail bolts which are arrayed sequentially to form a semicircular swing guide rail. The swing shell is provided with a semicircular swing guide groove and is slidably mounted in the swing guide rail through the swing guide groove. The mounting member is connected with the fixed shell through bolts. Two sides of the mounting member are respectively connected to swing cylinders through swing pins, each front end of piston rod of each swing cylinder is rotatably connected to a connecting pin of the lower end of the swing shell, and the two swing cylinders of two sides of the mounting member push the swing shell to swing along the semicircular swing guide rail. The device is convenient to use and can be used for automatic screwing and unscrewing the drill rod of a drill, screwing-unscrewing operation is efficient and reliable, and working intensity of operators is reduced greatly.

The invention relates to a soft electrostatic adhesion coating type bionic octopus manipulator. The soft electrostatic adhesion coating type bionic octopus manipulator comprises a connecting base, a main cavity and claw fingers, wherein the connecting base is in a hollow circular truncated cone shape, the lower end of the connecting base is open, and through inflating holes are formed in the upper end face of the connecting base; the main cavity is in a hollow drum shape, the upper end of the main cavity is open, and the main cavity is connected with the lower end of the connecting base; the periphery of the main cavity is provided with a plurality of connecting holes which are through from inside to outside; the multiple claw fingers are in a pneumatic network type; the claw fingers are hollow, the front ends of the claw fingers are inclined wedge-shaped, and the rear ends of the claw fingers are communicated with the connecting holes; the inflating holes are connected with the connecting holes through air pipes; the soft electrostatic adhesion coating type bionic octopus manipulator further comprises a flexible covering film; the covering film is disc-shaped, and the center of the top surface of the covering film is connected with the bottom of the main cavity; and a plurality of electrodes are arranged in the covering film. According to the soft electrostatic adhesion coating type bionic octopus manipulator, the clamping force is effectively increased, the clamping force borne by a target object can be equally divided, and the damage risk of the target object is reduced; and meanwhile, multiple grabbing modes are achieved, so that the clamping range is enlarged, and the use requirement can be fully met.

The invention discloses an automatic centering and clamping device based on transmission of worm-worm gears and crank connecting rods. The automatic centering and clamping device comprises at least two worm gears, wherein each worm gear is hinged to a crank connecting rod; the tail ends of the crank connecting rods are fixedly connected with pressure heads; the pressure heads are used for driving the crank connecting rods through rotation of the worm gears to drive the pressure heads to clamp a workpiece; each worm gear is driven by a worm which is meshed with the worm gear respectively; each worm is provided with a driven gear; each driven gear is meshed on the same driving gear. According to the automatic centering and clamping device, the worm-worm gears and the crank connecting rod mechanisms are arranged symmetrically, and the output force generated by the pressure heads is equal in magnitude and reverse in directions, so that automatic centering and alignment are realized, the fixture adjusting time can be shortened, the workpiece machining efficiency is increased, and the effects of saving labor force, saving time and increasing efficiency are achieved.

The invention discloses an electromagnetic suction cup type multi-direction clamping caliper. A rotating disk, a magnetic base installed at the lower end of the rotating disk in a matched manner, a bottom plate arranged at the lower end of the magnetic base, a fixed caliper body arranged at the upper end of the rotating disk, and a movable caliper body connected with the right side of the fixed caliper body in a matched manner are included; the body of the rotating disk is of a disk-shaped structure, and the fixed caliper body is arranged at the upper end of the rotating disk; the movable caliper body is installed at the right end of the fixed caliper body in a matched manner; the lower ends of the movable caliper body and the fixed caliper body are each a groove body of a U-shaped structure; a clamping block and the fixed caliper body form a fixed chuck, and the clamping block and the movable caliper body form a movable chuck; the fixed chuck and the movable chuck each correspondinglyhave three installing manners, and therefore the movable chuck and the fixed chuck form a multi-direction clamping manner, and the whole caliper is wider in clamping range; and due to a guiding rod,a guiding sleeve and a limiting plate arranged on the fixed caliper body, when a workpiece is clamped on the caliper, accurate positioning can be provided on the side face of the caliper, the installing and positioning error of the workpiece is lower, and the positioning and machining precision of the workpiece is improved.

The invention relates to the technical field of milling machine equipment, and discloses a clamp for milling machine machining. The clamp comprises a base, wherein fixing grooves are formed in the middle axes of the left side and the right side of the base, a supporting table is fixedly arranged at the top of the base, a clamping base is fixedly arranged at the end, away from the base, of the supporting table, a fixed arc clamping plate is fixedly arranged at the top of the clamping base, L-shaped lifting rods are fixedly arranged on the two sides of the top of the supporting table, and a movable arc clamping plate is arranged between the two L-shaped lifting rods. According to the clamp, the pressure generated in the part clamping process by the clamping plate is utilized, a transmission mechanism is arranged, the transmission mechanism can automatically transmit the pressure generated by the clamping plate to the part to a semicircular push rod, the semicircular push rod pushes out a friction ball, when the friction ball makes contact with the part, the contact area between the part and the clamping plate can be increased, and therefore the friction resistance of the part is increased, and the purpose of preventing the part from deviating in the drilling process is achieved.

The invention provides a circular seam assembly and welding device for a bearing type spherical storage tank. The circular seam assembly and welding device comprises a clamping rod, a connecting disc,a chassis, a support rod, a disc, an adjusting disc and an adjusting screw, wherein the clamping rod is welded with the connecting disc and is used for connecting a rotating device; a threaded rod isinstalled on the chassis and is connected with a threaded hole corresponding to a bearing storage tank; a groove is formed in the center of the chassis, so that the interference with a filler neck ofthe bearing storage tank is avoided; the height between the adjusting disc and the disc is adjusted by the adjusting screw, and the clamping range of the adjusting disc can be adjusted; and an arc surface is formed on the inner side of the adjusting disc, so that the inner side of the adjusting disc is tightly abutted with the bearing storage tank. The circular seam assembly and welding device has the advantages of the simple structure and convenience in installation, the bearing storage tank can be reliably and quickly connected with a headstock and tailstock rotating device, the roundness of the bearing storage tank can be corrected, and the welding dislocation meets technological requirements.

A centric clamping vice for centric clamping of workpieces is provided that includes a base support having a longitudinal axis, on which a first jaw mount, guided by a first carriage, and a second jaw mount, guided by a second carriage, are adjustably supported along an adjustment path oriented parallel to the longitudinal axis with the aid of a spindle drive. A pair of first slides is assigned to the first carriage, and a pair of second slides is assigned to the second carriage, and the difference between the track width of the first slides and the track width of second slides is greater than the width of second slides.

The invention relates to a magnetostriction type jiggle clamp, which comprises an upper jaw (1) and a lower jaw (2). The front ends of the upper jaw and the lower jaw are provided with a clamp mouth (3); the jiggle clamp also comprises an upper cantilever (4), a lower cantilever (5), a connecting arm (6), an ultra-magnetostriction material bar (7) and a solenoid coil (8) used for providing a magnetic field for the ultra-magnetostriction material bar; the upper cantilever and the lower cantilever are connected through the connecting arm, the tail ends of the upper jaw and the lower jaw are connected with one end of the upper cantilever, and a flexible hinge for the lower jaw to rotate to the direction of the upper jaw is arranged between the lower jaw and the upper cantilever; the ultra-magnetostriction material bar is propped between the lower jaw and the lower cantilever; and the lower jaw, the upper cantilever, the lower cantilever and the connecting arm are made of magnetic conducting materials. The magnetostriction type jiggle clamp of the invention has the advantages of large clamping range, large clamping force, high response speed, and easy control for precision.

The invention relates to the field of pile pulling, in particular to a working method of a multi-stage pile pulling device with a one-way locking effect. The multi-stage pile pulling device comprisesa manual clamping mechanism, a rotating mechanism, a lifting plate, a guide plate, a buffer treading mechanism, a buffer telescopic mechanism, an automatic clamping device, a timber pile, a jacking pipe and two one-way clamping devices. According to the working method of the multi-stage pile pulling device with the one-way locking effect, a worker is prevented from shaking the timber pile back andforth, breakage of the timber pile is avoided, the process of pile pulling through equipment is not needed, and the worker can conveniently pull the timber pile. The buffer treading mechanism drivesthe buffer telescopic mechanism and automatic clamping arms to clamp and move the timber pile upwards, the pulled timber pile is locked through the one-way clamping devices, and the timber pile is prevented from sliding downwards. The clamping range of the automatic clamping arms is large, frequent replacement of parts is avoided, the timber pile pulling process is rapid, the worker can conveniently and rapidly carry out pile pulling work, excessive labor of the worker is avoided, and the working efficiency of the worker is improved.