498results about How to "Neutral good" patented technology

The invention relates to a high-pressure reducing valve. A throttling hole which is communicated with an air inlet cavity and an air outlet cavity and a valve core which axially and movably penetrates through the throttling hole are arranged in a valve seat; the valve core is provided with a throttling conical surface which is in movable and sealing fit with a lower hole opening of the throttling hole in the air inlet cavity; the upper end of the valve core supports against a piston in a matching mode; the lower end of the valve core is elastically assembled in the valve body through an offsetting spring; the throttling conical surface of the valve core is axially arranged at the middle part of the air inlet cavity just opposite to the an air inlet; the lower end of the valve core is provided with a lower valve post which is assembled in the valve seat in a sliding and sealing mode; and the diameter of the lower valve post is equal to the aperture of the throttling hole of the valve seat. In the invention, the diameter of the lower valve post is equal to the aperture of the throttling hole of the valve seat so that an axial action force of inlet pressure acting on the valve core is zero so as to eliminate the influence of the fluctuation of inlet pressure on outlet pressure and improve the pressure stabilizing precision.

The invention discloses a pipeline cleaning robot capable of adapting to change of different pipeline diameters and a method. The pipeline cleaning robot comprises a radial walking mechanism, a powertransforming mechanism, a pipeline diameter self-adaption mechanism and a cleaning mechanism; the radial walking mechanism comprises a plurality of walking units which are distributed in the circumference of a main shaft of a robot body, and all the walking units are of the same structures; the power transforming mechanism transmits power located on a motor shaft of the main shaft of the robot body to each walking unit in a direction changing mode to realize direction changing and transmission of power; the pipeline diameter self-adaption mechanism comprises an adjusting mechanism and a connecting rod which is connected with the radial walking mechanism, and the adjusting mechanism drives the connecting rod to move, by changing the position of the adjusting mechanism on the main shaft, movement of the connecting rod is achieved, meanwhile, the adjusting mechanism drives the distance between the radial walking mechanism and the main shaft in the radial direction to achieve adaption of the pipeline diameters; and the cleaning mechanism is arranged at the front end of the main shaft and cleans different positions in the pipeline along with moving of the radial walking mechanism.

The invention discloses arc extinguish chambers of a high voltage alternating current SF6 pot-type breaker. The invention is characterized in that an arc extinguish chamber system comprises a shell with the arc extinguish chambers, plum blossom contact systems, fixed contact systems, capacitor assembling units, air cylinder systems, a mechanical drive system, ion capturing systems, compressed airpiston assembling units, intermediate contact assembling units, insulation supporting bars, moving end large shields and fixed end large shields; the arc extinguish chambers are of double-break structure and are symmetrically distributed, with the mechanical drive system as the center; the middle mechanical drive system moves along the vertical direction; and vertical movement of the mechanical drive system is transformed to horizontal movement through crankarms and connecting rods in the mechanical drive system to drive the two air cylinder systems of the arc extinguish chambers to move horizontally to switch off and switch on the switchgear. Through promoting the technology of the integral arc extinguish chamber of the breaker, the arc extinguish chambers have more uniform electrical field, high insulation level, stronger breaking capability and high current-carrying capability and is safer to operate.

The invention discloses a thin-wall high temperature alloy tubing simulation extrusion device, belonging to tubing thermal-extrusion field. The device comprises a standard die set with a guiding device, and a simulation tubing thermal-extrusion mould which is arranged on the standard die set with the guiding device, the standard die set comprises an upper die holder, a lower die holder, a guide pillar and a guide bush, one end of the guide bush is connected with the upper die holder, the guide post is connected with the lower die holder, and the other end of the guide post is sheathed in the guide bush and can move along the guide bush up and down. The simulation tubing thermal-extrusion mould comprises an extrusion shaft, an extrusion needle, an extrusion pad, a positioning frame, an extrusion container inner lining, an extrusion container outer lining, a die cushion, a cushion block and an extrusion die. The device of the invention has good popularity; the guide post and the guide bush are adopted, the die cushion and the extrusion container have positioning ring coordination, the extrusion needle and the extrusion pad have guide coordination, good alignment, and convenient and flexible use; the time consumption of experimental process is short, the efficiency is high, the material use ratio is high and the cost is low.

The invention discloses bifurcate lap connection of reinforcing steel bars and a connection method thereof. In the traditional construction industry, the axes of the reinforcing steel bar connected by lapping is not centered to affect the stress performance. The bifurcate lap connection of the reinforcing steel bar comprises a reinforcing steel bar (1) to be connected, the reinforcing steel bar to be connected is connected with a bifurcate reinforcing steel bar (2), the middle of the bifurcate reinforcing steel bar is provided with a prepared hole (4) which is concentric with the axes of the reinforcing steel bar to be connected, a connecting reinforcing steel bar (3) is arranged in the prepared hole, the periphery of the bifurcate reinforcing steel bar is provided with a spiral reinforced rib (5) along the axial direction, and the bifurcate reinforcing steel bar section is provided with concrete (6). The invention is used for lapping and connecting the reinforcing steel bar between prefabricated concrete structures.

The invention provides an electric eddy transducer dynamic calibration device which comprises a vibration platform, a sensing disc, a standard acceleration transducer, an installation and adjusting mechanism, a base and a supporting rod. The installation and adjusting mechanism comprises an installation plate for containing an electric eddy transducer and a position adjusting mechanism for driving the installation plate to move up and down, and the position adjusting mechanism comprises an upper support, a lower support, an adjusting screw rod, a ruler and a rotary knob. The adjusting screw rod and the ruler are connected with the upper support and the lower support, the rotary knob drives the adjusting screw rod to rotate so as to enable the lower support to move up and down, the adjusting screw rod is parallel to the ruler, the top end of the ruler is fixedly connected with the upper support, the ruler is in slidable connection with the lower support, the upper support is installed on the supporting rod in a rotatable mode, a locking mechanism which locks the position of the upper support is arranged on the upper support, the lower support is installed on the supporting rod in a slidable and rotatable mode, a fastening mechanism which fastens the position of the lower support is arranged on the lower support, and the installation plate is fixed on the lower support. The electric eddy transducer dynamic calibration device has the advantages of enabling the electric eddy transducer to precisely align at a testing platform, and being high in calibration precision.

A megawatt-level semi-direct driving wind generator comprises a wind wheel, a distance changer, a main axle, a speed accelerating box, a coupler, a generator, a cabin chassis, a bias motor and a control system. The chassis is fixed with the bias motor and the generator, the accelerating box is fixed with the side wall of the chassis, the accelerating box is first-stage planet accelerating gear box, and the motor is low-speed permanent magnetic three-phase synchronous generator. The invention can stabilize the transmission of transmitter, reduce impact, and reduce sealing demand or the like, with adjustable installed height, simple structure, high strength and accurate angle control on distance change as 0.1 degree, to output constant power.

A front feeding system for short-stroke squeezer of aluminium part and its clamp-type adaptive ingot supplying system has squeezer with fixed pressing block, clamp-type adaptive ingot supplying system consisting of manipulator, master arm and slide block, master arm cylinder, slide guider and pressing plate, pressing rod, the hydraulic control units for lateral cylinder and pressing rod and ingot supplying unit, and electric control unit.

The invention discloses a full-casing full-rotation drilling rig, which relates to engineering machinery. Including power station, working device and auxiliary drilling tools. The power station is external, and the working device includes a base, a power support platform, a column, a lifting platform and a casing clamping device, and there is an outrigger cylinder in the base for leveling. Drawing cylinders, hydraulic motors, gearboxes, clamping cylinders and gear transmissions are the main devices that transmit power to the casing, driving the casing to rotate, rise and fall. Auxiliary drilling tools include casings of various specifications, grabs, multi-head grippers, etc. The full-casing full-rotary drilling rig has four main actions: leveling, clamping, turning, pressing and pulling. The engine in the power station drives a number of hydraulic pumps, which are connected to the working device through hydraulic hoses and transmit the power to the corresponding actuators.

The present invention relates to heat melting butt jointing welder for plastic pipe and belongs to the field of plastic pipe welding apparatus making technology. The heat melting butt jointing welder includes mainly frame comprising upper frame with controller, lower frame, etc.; clamping mechanism comprising fixed clamps, movable clamps, etc.; cutting mechanism comprising sliding track with turning cylinder, sliding seat with translation cylinder, cutting motor with reducing box, cutting board with lathe tool, etc.; and heating mechanism comprising upper sliding seat, lower sliding seat, heating board sliding body, heating board holder with heating board, etc. The present invention has reasonable design and compact integral structure, and may be used in completing clamping, cutting, heating and butt jointing of different kinds of plastic pipes, especially plastic pipes of caliber as great as 800-2000 mm.

The invention discloses a shearing testing device and an operation method thereof. The shearing testing device comprises a fixture base, guide rails, a movable fixture, a fixed fixture, a center-aligning block, a first aligning plate, a second aligning plate, a wedge-shaped block, a first compressing block, a second compressing block and a fixture leveling plate, wherein the two guide rails are longitudinally fixed on the fixture base side by side; symmetrical bosses are arranged at two sides of the movable fixture, and are provided with through holes; the movable fixture sleeves the guide rails via the through holes; the top of the center-aligning block is provided with a bulge matched with a V-shaped notch of a test element; the first aligning block and the second aligning block are both hexahedron square blocks with bulged steps; the first compressing block is positioned below the upper clamping surface of the fixed fixture and is connected with the upper clamping surface; the second compression block is positioned below the upper clamping surface of the movable fixture and is connected with the upper clamping surface. According to the invention, the precise alignment of the shearing test element at the thickness direction and length direction can be ensured, and the clamping operation is very convenient.

A cutter servo micro-feeding mechanism relates to a part processing displacement mechanism, is based on a voice coil motor and is characterized by being fast, high in frequency response and accuracy, large in journey, multiple in shock buffer effect, double in pre-tightening effect and good in cutter cutting rigidity and force conductivity. The cutter servo micro-feeding mechanism is provided with a flexible hinge, a base, an elastic connection rod, an adapter plate, an elastic connection rod adjustment nut, an end cover, a spring adjustment nut, a voice coil motor stator, a voice coil motor rotor, an air hydrostatic guideway inner rail, a capacitance displacement sensor, a sensor support frame, an air hydrostatic guideway outer rail, a lathe tool, a tool bit clamp, a transmission shaft, a pre-tightening nut and a disc spring.

The invention discloses an automatic centering device mainly used for a camera to detect videos in a pipe. The video detection camera automatic centering device in the pipe keeps the camera in the central position of a pipeline all the time. The centering device is mainly composed of a central cylinder, sleeves, springs, supporting rods and the like, wherein the camera is arranged inside the central cylinder, the two sleeves are arranged on the central cylinder, one sleeve is axially fixed, the other sleeve can slide freely on a central cylinder body, a supporting part is composed of three sets of supporting rods, the supporting robs are distributed in a 120-degree circumference mode, each supporting rod is composed of a supporting rod body, a wheel, a pin, a clamp ring and corresponding parts, the two supporting rods respectively arranged on the two sleeves are crossed and are connected through the pins, each supporting rod is provided with a small hole to fix a spring, the springs play a role in guaranteeing that the three sets of supporting rods are contacted with the pipe wall all the time, and through the assembly of different positions of three motion secondary connecting holes in the middles of the supporting rods, three connecting schemes of the supporting rods are obtained, and therefore the centering device is applicable to work in a large pipe diameter range.

The invention relates to a bidirectional alignment laser centering adjustment device and a centering method, and belongs to the field of laser centering. A diameter measurement rear wing is fixedly connected with a fixed laser receiving cylinder, and a fixed leg support is fixed on the fixed laser receiving cylinder. A turnable laser macro-micro adjustment box is fixedly connected with the fixed laser receiving cylinder. The device is advantageous in that the device achieves the macro-micro adjustment of a laser, drives the laser to operate through the sticking-slipping inertia principle, obtains a laser linear equation through calculation, is used for a bidirectional centering shaft system, and enables the centering precision to be higher.

The invention relates to a joint for a track panel, in particular to an F-shaped steel track joint with more expansion amount for a middle and low speed maglev track. A pair of long front and back F-shaped steels and a short middle F-shaped steel are machined into joint structures which are mutually matched; the expansion amount of the joint structures can reach 20-60mm; and the expansion amount of the two connected joints can reach 40-120mm. The joint has the advantages of high installation and alignment accuracy, the expansion amount of thermal expansion and thermal contraction and the like and effectively solves the problem that a track needs more expansion amount.

The invention relates to a grounding switch capable of extinguishing arc quickly through electromagnetic reluctance tension. The grounding switch comprises a fixed contact and a moving contact of which abutting ends are arranged in a vacuum arc-extinguishing chamber, and further comprises an electromagnetic reluctance tension mechanism connected with the moving contact; the electromagnetic reluctance tension mechanism is composed of a terraced push rod, a metal disk and a permanent magnet disk both arranged on a large-diameter section of the push rod in a sleeve manner, a cylindrical magnetizer fixedly arranged at one end of a small-diameter section of the push rod, a hollow cylindrical insulating sleeve with a ring slot, and a yoke circularly arranged at periphery of the cylindrical insulating sleeve, wherein the large-diameter section of the push rod is connected with the moving contact, the metal disk is located above the permanent magnet disk and is attracted together with the permanent magnet disk, and the cylindrical magnetizer is located at the hollow position of the cylindrical insulating sleeve; and the grounding switch further comprises a hollow permanent magnet disk support plate of which the upper side fixes the permanent magnet disk, and a gap part between the permanent magnet disk support plate and the metal disk is provided with a plurality of compressed energy storage springs. The grounding switch capable of extinguishing arc quickly through electromagnetic reluctance tension is simple in structure and relatively low-cost, performs switch-on action very quickly, has high arc-extinguishing capability, and can switch on large current.

The invention discloses a disc-type rod fastening rotor structure for a heavy-duty gas turbine, which comprises multistage compressor wheel discs in a compressor section, wherein the compressor wheel discs are connected and the compressor wheel discs and a middle combustion chamber section are connected through axial twist transmission pins; all stages of compressor wheel discs and the middle combustion chamber section are connected into a whole through central draw rods; the middle combustion section is connected with multistage turbine wheel discs in a turbine section; all stages of turbine wheel discs and the middle combustion chamber section are connected into a whole through prestressed circumferential draw rods; all stages of turbine wheel discs are engaged and the turbine wheel discs and the middle combustion chamber section are engaged through face teeth; therefore, the coaxiality of all stages of compressor wheel discs and the middle combustion chamber section and the coaxiality of all stages of turbine wheel discs and the middle combustion chamber section are guaranteed so as to guarantee the integral centrality of a rotor. The structure has the advantages of high centrality and high assembling efficiency.

The invention discloses a hydro-viscous speed regulating clutch capable of achieving two-way adjustment. The hydro-viscous speed regulating clutch comprises a case body, a control mechanism and a transmission mechanism, wherein the control mechanism comprises a piston cylinder and a second piston cylinder, the transmission mechanism comprises an input shaft system, an output shaft system, friction sheets and dual discs, and an input shaft and an output shaft are connected with an upper supporting base and a lower supporting base respectively; a lubricating oil path inlet of a driving shaft transparent cover communicates with radial lubricating oil paths and axial lubricating oil paths, the driving friction sheets and the driven friction sheets are extruded from the two ends by adjusting oil pressure of a control oil path, and two-way adjustment of the hydro-viscous speed regulating clutch is achieved. According to the hydro-viscous speed regulating clutch capable of achieving two-way adjustment, by changing the input end structure, a piston is installed between an upper end cover and the input shaft in an embedded mode, so that the piston is still relative to a right piston and the input shaft; the right piston is separated from the input shaft, the influence caused by desynchrony of rotating speeds of the input shaft and the right piston is effectively avoided, two-way compression of the clutch is achieved, and therefore stability of power output of the hydro-viscous speed regulating clutch is improved.

The invention relates to a triaxial testing machine and a testing system. The triaxial testing machine comprises a loading frame, a specimen box, a base, six actuators, a lifting oil cylinder and a locking oil cylinder, wherein the axes of the six actuators intersect at a point O. The actuators are used to provide six loads perpendicular to the six surfaces of a test piece to the test piece in a test piece box, so that three directions perpendicular to the surfaces of the test piece have independent load / unload capability; the test piece box is used to install and position the test piece, so that the geometric center 0'' of the test piece coincides with the geometric center 0' of the test piece box, and the geometric center O' of the test piece box coincides with the point O, and any faceof the test piece is perpendicular to the axis of any actuator. The triaxial testing machine and the testing system can conveniently and quickly complete the centering process of the test piece, the three-direction six-surface loading of the test piece can be performed, true triaxial tests can be completed, and in the three-direction six-surface loading process, one-direction sudden unloading canalso be achieved to complete rock burst tests.

The invention relates to a three oil wedge variable curvature sliding bearing. It is formed from axle sleeve and axle bush, in the axle bush the rotating axle is placed, between axle and axle sleeve and axle bush the gaps are set for storing lubricating oil. It is mainly characterized by that the curvature radius of said axle bush is varied according to a certain regularity, and in the work it can effectively form three oil wedges so as to implement hydrodynamic lubrication of bearing, and has good automatic centring property.

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 relates to an adjustable cylinder structure synchronous centering and clamping device. The device sequentially supplies power and motion to a bottom large gear (4), a small gear (5), a small gear shaft (6) and a lead screw (8) through a motor (1), and finally, the lead screw (8) wholly drives six round pressing blocks (10) to move forwards. Finally, the six pressing blocks (10) move to the center at intervals at the same time until a cylinder structure in the right middle of a working table (3) is clamped. Power of the structure is supplied through the motor (1), and motion is accurately transmitted through a gear and screw structure; by means of the adjustable cylinder structure synchronous centering and clamping device, the cylinder structure has the good centering performance in the clamping process. As the gear and screw structure accurately transmits force, and therefore all pressing blocks (10) bear completely-equal pressure when the cylinder structure is clamped and are driven by the lead screw (8), and the adjustable cylinder structure synchronous centering and clamping device is suitable for the cylinder structures with various radii. The adjustable cylinder structure synchronous centering and clamping device is an assisting device for machining, experimental studying and the like of the cylinder structures with various radii.

The invention relates to conveniently-detached floating rotary shaft seal, which comprises a pressure plate, a floating space forming plate, a seal main body assembly and a fixed bolt. The conveniently-detached floating rotary shaft seal is characterized in that: the seal main body assembly cannot rotate but only radially float in a cavity which is formed by a machine shell, a main shaft, the floating space forming plate and the pressure plate; the seal main body assembly is formed by alternately superposing seal materials with aluminum plates which are connected by connecting bolts and nuts so as to form the rotary shaft seal; and the seal materials and the aluminum plates of the seal main body assembly are divided from the middle to be convenient to disassemble and assemble. The conveniently-detached floating rotary shaft seal has the advantages of low manufacturing cost, good centering effect, convenient disassembly, assembly and maintenance and long service life. When the seal materials are changed into heat-resisting materials, the materials can be used for sealing gas at high temperature.

The invention relates to an oil-field slant well drilling rig, in particular to a tubular pile centering device for a slant well drilling rig. Two ends of a front connecting rod and a rear connecting rod of the device are connected to an auxiliary arm and a main arm through rotary shafts, a mechanical limit device is welded to the auxiliary arm, a screw seat and guide rail of a distance regulating device are connected to the main arm through bolts, a supporting rod of the distance regulating device is connected to a rear connecting rods through a pin, a hydraulic cylinder seat is welded to the main arm, and a hydraulic cylinder operated with the hydraulic cylinder seat is connected to the front connecting rods. By the aid of the tubular pile centering device, centering a tubular pile which is horizontally stored and which is moved accurately and rapidly with a wellhead drilling pile can be realized, tubular pile centering performances are fine, so that the drilling rig tubular pile processing procedure is simple, secure and reliable, automation degree of a slant well drilling rig tubular pile processing system can be increased, and the defects that an existing slant well drilling rig tubular pile processing procedure is complex, tubular pile centering effect is unexpected, operating efficiency is low, and security is poor are overcome.

The invention relates to an injection screw of an injection machine which has the functions of preventing a material from refluxing and stopping reverse and consists of a screw head, a check ring, a thrust ring and a screw body. The novel check ring with an inner flange and a clamping head, the screw head with a radial cutting groove and the thrust ring with a step surface realize excellent seal performance and eliminate the leakage problem caused by nonmelt grains, contaminations or other impurities by the slide closure between the inner flange of the check ring and the cylinder of the screw head as well as between the inner annular surface of the check ring and the step surface of the trust ring. In injection, the area of the larger end surface of the check ring ensures the realization of fast starting and shortens the closing time of the check ring. The fused masses are promoted to be further mixed when the radical cutting groove of the screw head is plasticized; in injection, the refluxing of the fused masses can be buffered; the leakage amount of the fussed massed can be reduced and the measuring precision is improved.

The invention discloses a bushing press-fit bolt and a press-fit method thereof. The bushing press-fit bolt is used for press fitting bushings into pressing sleeve holes of workpieces to be pressed and sleeved, and the center of each bushing is provided with a bushing hole. The bushing press-fit bolt comprises a pressing sleeve screw, a nut, two pressing sleeves and two flange discs; the pressing sleeve screw comprises a screw head and a screw rod, the two pressing sleeves comprise a first pressing sleeve and a second pressing sleeve, and the two flange discs comprise a head flange and a tail flange; the head flange, the first pressing sleeve, the second pressing sleeve, the tail flange and the nut are sequentially and coaxially installed on the screw rod from the screw head in a sleeving mode, and the outer diameter of each flange disc is larger than that of each pressing sleeve. By means of the structure and method, two bushings can be simultaneously press fit through one-time press-fit, the abrasive resistance of the press-fit bolt is good, the pressing sleeves and threads are all not prone to damage, the service life is long, the press-fit yield is high, the press-fit uniformity and centering performance are good, and the manufacturing cost is low.

The invention relates to a device for testing feeding force and lifting force of a top-drive power head drill. At present, a device for testing the feeding force and the lifting force of the top-drive power head drill is required to reliably fix the drill, as well as ensuring the center of the power head of the drill is concentric with the testing device, but both are hard to realize, which results in that the drill shaft is likely to arch to influence the testing precision during testing the feeding force. The device comprises an oil cylinder, a force transmission core bar, a hinge bearing and a base plate, wherein the oil cylinder is arranged on the hinge bearing, and the base plate is mounted at the bottom of the hinge bearing; a piston rod of the oil cylinder is of a hollow structure and is provided internally with the force transmission core bar, and a pulling pressure sensor is mounted at the tail end of the force transmission core bar; the bottom of the base plate of the testing device is arranged on a guide rail on the drill body through a holder bearing; and a testing drilling rod held by the power head of the drill is connected with the pulling pressure sensor. With the testing device provided by the invention, the drill fixation is unnecessary; centering of the device relative to the power head of the drill is good, and thus the testing error is reduced.

The invention provides a creep compression experimental apparatus. The creep compression experimental apparatus comprises an installation frame connected between an upper stretching rod and a lower stretching rod of a creep test machine, wherein the installation frame comprises an upper pressure block and a lower pressure block, the upper pressure block is provided with a threaded hole A, the lower pressure is provided with a conical hole coaxial with the threaded hole A, one end of a test sample is fixed in the threaded hole A, the other end is located in the conical hole by virtue of a conical head of a conical positioning device, and when the conical head is matched with the conical hole, the threaded hole A, the conical head, the conical hole and the test sample are coaxial. The auto-positioning function is realized by virtue of a conical surface contact of the conical positioning device, so that the test sample can be well centralized in the single-axis compression process, and the instability bending possibility of the test sample can be reduced. By virtue of the reversely-arranged extension rod, the rebound displacement of a precompressed sensor measuring head in the reset process is taken as the compression creep deformation of a sample, so that the occurrence of overstroke of the sensor measuring head and damage to the displacement sensor can be effectively avoided.

The invention discloses a tong-type automatic unhooking device which belongs to the technical field of mechanical lifting and towing devices. The invention is characterized in that two tong pieces are symmetrically arranged; one end of each tong piece is hinged with one end of a connecting rod; the other end of the connecting rod is connected with a sliding block shaft; one end of the sliding block shaft is connected with an opening sliding block; the sliding block shaft and the opening sliding block are arranged in a sliding chute on a first drawplate and a sliding chute on a second drawplate; a post rod is also arranged in the sliding chute; one side of the post rod, which is different from the sliding block shaft, is connected with a connecting shaft; the other end of the sliding block shaft is locked in a self-locking device; the self-locking device is arranged on the outer side surface of the first drawplate; the inner side surfaces of the first drawplate and second drawplate are connected with a bracket; the bracket is connected with a drive unit linear stepping motor; one end of the first drawplate is connected with one end of the second drawplate through an axis pin; and the other ends of the first drawplate and second drawplate are hinged with the tong pieces. The device has the advantages of simple structure, small opening force, convenient operation, safe and reliable operation, accurate unhooking landing point and favorable centering performance, and can be remotely controlled.

The invention provides a low-speed rotating original taste extrusion juicer and aims at providing a juicer small in occupied space, high in juice yield, light in weight, small in noise and convenient to dismantle and clean. The technical scheme is that at least three coarse pitch spiral blade teeth (20) extending to the front end of a cylinder along the circumferential bus direction and a rotating body head (15) forming a cone spiral with the front-end cylinder are arranged on the cylinder of a spiral propeller (5) positioned on an induction direct current motor spindle, and a turbine spiral tooth communicated with a spiral blade tooth channel is arranged at the shaft end of the rotating body head. The low-speed rotating original taste extrusion juicer is provided with a spiral extrusion port (19) and a mesh structure, residues of fruits and vegetables are discharged to a juicer hood (9) outside the juicer, wall knives (17) arranged around the extrusion port spiral surface equidistantly are arranged on an inner wall of the juicer hood (9), every wall knife extends towards a ring of the spiral surface (18) symmetrically, a frustum is formed in the axial direction, and a residue outlet with a residue discharging hole is inserted into a feeding barrel through a rotating clamping hook to be buckled so as to be connected to be a whole.