211results about How to "Realize automatic centering" patented technology

The invention relates to a mechanical gripper of a dispensing robot. The mechanical gripper of the dispensing robot comprises a rack, a double-threaded screw, a left finger and a right finger, a motor, an encoder and a gripper controller, wherein the double-threaded screw is rotatably arranged on the rack, and the two ends of the double-threaded screw are respectively provided with threaded parts; the rotating directions of the threaded parts are opposite, and the left finger and the right finger are respectively matched with the two threaded parts of the double-threaded screw; the double-threaded screw rotates to drive the left finger and the right finger to move closely or oppositely, and the rotating shaft of the motor drives the double-threaded screw to rotate; the encoder is used for detecting the rotating position of the rotating shaft of the motor, and the gripper controller is connected with the motor and the encoder, and is used for controlling the rotation of the motor and processing signals fed back by the encoder; and the left finger and the right finger are provided with wedge-shaped grooves, and the wedge-shaped groove of the left finger is corresponding to the wedge-shaped groove of the right finger, so that a drug bottle is clamped in a clamping space formed by the wedge-shaped groove of the left finger and the wedge-shaped groove of the right finger. The mechanical gripper has the functions of size measurement, self-adaptability, self-centering and controllable gripping force.

The invention relates to a hydraulic peristaltic pipeline robot traction device, which can provide powerful traction force for robots in pipeline operation such as an oil-gas pipeline, a sewage pipeline and the like. The hydraulic peristaltic pipeline robot traction device mainly consists of an extension cabin, a propelling cabin and a propelling oil cylinder, wherein the extension cabin mainly consists of an extension cabin body, an extension cabin front cover, extension cabin supporting legs, extension cabin brackets, extension cabin supporting rods, an extension cabin supporting leg oil cylinder, a synchronous plate, a synchronous plate slide shaft and an extension cabin rear cover; the propelling cabin mainly consists of a propelling cabin body, a propelling cabin front cover, propelling cabin supporting legs, propelling cabin brackets, propelling cabin supporting rods, a propelling cabin supporting leg oil cylinder, a synchronous plate, a synchronous plate slide shaft and a propelling cabin rear cover. The hydraulic power is adopted as a power source, sufficient traction power can be provided for a pipeline operation robot, and the successful traveling of the pipeline robot in the pipeline can be guaranteed. The hydraulic peristaltic pipeline robot traction device has advantages of simplicity in structure, high carrying capacity, high reliability, high environmental adaptability and the like.

The invention relates to a novel numerical control bamboo splitting machine, which includes a lathe bed guide rail, a rotation mechanism, a driving chain, a bamboo tube loading mechanism, a bamboo tube diameter measurement device, a stepping motor, a cutter combination assembly, a bamboo centring combination assembly, a transmission system, a swinging mechanism, a push plate combination assembly, and a sash weight, and is characterized in that a push plate combination component is arranged on tool body guide rails; a driving chain for driving the push plate combination component to move back and forth is arranged between the two guide rails; a rotational cutter disc combination component is arranged at the front ends of the tool body guide rails; a bamboo tube loading mechanism is arranged on right sides of the tool body guide rails; two movable bamboo tube centering combination components are arranged on the upper left sides of the tool body guide rails; and when the push plate combination component does backlash motion, the bamboo tube loading mechanism conveys a bamboo tube into a measuring device to measure the diameter of a small head of the bamboo tube, the bamboo tube enters two V-shaped bearings, and combination cutters which are matched are rotated to the center of the bamboo tube and aligned; and a transmission system is reversed, and the push plate combination component pushes the bamboo tube to the combination cutters, so that the bamboo tube is split into bamboo chips. Compared with the conventional bamboo splitting machine, the numerical control bamboo splitting machine has the advantages that automatic loading, automatic tool changing and automatic centering of the bamboo tube are realized, one operator is reduced, the labor strength is lowered, the width error of the split bamboo clips is reduced, and the utilization rate of bamboo woods is improved.

The invention relates to material mechanical performance testing equipment, and aims to provide a tensile test clamp for a high-pressure hydrogen environment material testing machine. The clamp comprises an upper load transfer frame, a lower load transfer frame, an upper clamp arranged in the upper load transfer frame and a lower clamp arranged in the lower load transfer frame, wherein the upper clamp and the lower clamp respectively comprise a spherical cavity seat and a spherical hinge support seat; each spherical cavity seat is a cylinder with an opening formed in the center; a spherical mold cavity body is inward formed in one end of each cylinder; each spherical hinge support seat comprises a cylinder, a spherical coronal body and a convex part in sequence; the spherical cavity seats and the spherical hinge support seats are positioned in the corresponding load transfer frames; the cylinder of each spherical hinge support seat penetrates through an opening in the center of the spherical cavity seat and a central through hole in the corresponding load transfer frame in sequence and can move freely; the upper clamp and the lower clamp are symmetrical vertically. By utilizing the clamp disclosed by the invention, a sample installation process is rapid, simple and convenient; a sample can be automatically centered in the situations of parallel misalignment, deflection misalignment or mixed misalignment, and the test data accuracy is improved.

The invention relates to high-torque hydraulic wrenching and disassembling equipment suitable for an outer-flat drilling rod, belonging to the field of drilling and exploring machineries. The high-torque hydraulic pipe-wrenching machine for wrenching and disassembling the outer-flat drilling rod is characterized by comprising lower clamping tongs, a floating device, clasp punching tongs, an orifice leaving oil cylinder, a sliding block at the lower end part of a left floating post and a sliding block at the lower end part of the right floating post of the floating device respectively correspond to the insides of a left chute and a right chute of a lower clamping tongs support of the lower clamping tongs, the body of the orifice leaving oil cylinder is fixed at the rear end part of the lower clamping tongs support, and a piston rod of the orifice leaving oil cylinder is articulated with a floating frame; and the clasp punching tongs are arranged on a floating plate of the floating device, and clasp turning tongs are arranged on a bottom plate of the clasp punching tongs. The invention adopts an integral structure of clamping, clasp turning, clasp punching / pre-tightening and is suitable for the wrenching and the disassembling of the outer-flat drilling rod.

The invention discloses a reverse end cam type lifting stereo garage vehicle carrier which comprises a walking mechanism, a comb toothed mechanism used for carrying a vehicle, an automatic centering mechanism for carrying the vehicle, and a vehicle lifting mechanism. The vehicle is parked on a comb tooth of a parking space; the carrier moves to the parking space; a moveable comb tooth of the carrier stretches and enters into a fixed comb tooth; when the moveable comb tooth stretches, the automatic centering of the vehicle is finished; a lifting mechanism with a reverse end cam structure is used for lifting the vehicle on the moveable comb tooth; the carrying for the vehicle is finished under the driving of a walking system, so that the storage and taking for the vehicle in the stereo garage are realized. The carrier provided by the invention has the advantages of simple and compact structure, high reliability, and the like; the storage and taking for the vehicle in the stereo garage can be efficiently finished; the fault rate of the carrier in the stereo garage is reduced; the vehicle-storing and taking efficiency is increased; the automatic level of the stereo garage is increased.

The invention discloses an adaptive cylinder gripping claw, and belongs to the field of mechanical claws. The adaptive cylinder gripping claw comprises a machine frame and clamping claws symmetricallydistributed on two sides of the machine frame, the two clamping claws are connected with the machine frame through symmetrical adaptive deformation mechanisms, wherein each adaptive deformation mechanism comprises a middle slide block and connecting rod mechanisms symmetrically connected to two sides of the middle slide block and connected with the clamping claws on both sides, the middle slide blocks, the connecting rod mechanisms on one sides and the clamping claws form three four-bar mechanisms which are connected in series, the middle slide blocks are provided with middle clamping blocks,and the clamping claws on both sides are provided with side clamping blocks; the middle sliding blocks move towards the center, and the clamping claws on both sides are driven to contract towards thecenter by the connecting rod mechanisms, and the middle clamping blocks and the side clamping blocks hold a cylinder tightly and complete centering. According to the adaptive cylinder gripping claw,clamping forces uniformly distributed on the circumference with basically the same size are applied to the three directions of the cylinder, so that the requirement of the clamping forces is met, an automatic centering effect is realized, and objects can be prevented from sliding off in the gripping process.

The invention belongs to the technical field of steering control of vehicles, and relates to a hydraulic steering system. A front left steering oil cylinder and a front right steering oil cylinder are connected with a front steering knuckle arm; a rear left steering oil cylinder and a rear right steering oil cylinder are connected with a rear steering knuckle arm; a port P, a port T, a port Ls, a port R and a port L of a flow amplifier are connected with a port P, a port T, a port Ls, a port R and a port L of a hydraulic steering device respectively; a port PP and the port P of the flow amplifier are connected with each other; a port CR of the flow amplifier is connected to a port T of an electro-hydraulic steering valve; a port CL of the flow amplifier is connected with a large cavity of the front left steering oil cylinder and a small cavity of the front right steering oil cylinder; a port P of the electro-hydraulic steering valve is connected with a small cavity of the front left steering oil cylinder and a large cavity of the front right steering oil cylinder; a port A of the electro-hydraulic steering valve is connected with a large cavity of the rear left steering oil cylinder and a small cavity of the rear right steering oil cylinder; and a port B of the electro-hydraulic steering valve is connected with a small cavity of the rear left steering oil cylinder and a large cavity of the rear right steering oil cylinder. The hydraulic steering system has the advantages that the system has two interchangeable steering modes and is easy to operate.

The invention discloses an automatic centering and clamping device, which comprises a cylindrical mandrel and a cylindrical expansion mould. One end of the mandrel is fixed onto a chuck, the expansion mould is sleeved on the mandrel, a cavity with an annular section is arranged inside the expansion mould, an air inlet hole is arranged on one side of the expansion mould positioned on the chuck and is communicated with the air inlet hole, an air inlet pipe is connected outside the air inlet hole, and a valve is arranged on an air inlet pipe. The automatic centering and clamping device is used for clamping and fixedly machining a workpiece, the operation is extremely convenient, the labor intensity of operators is reduced, and workpiece clamping efficiency and workpiece machining precision are improved.

The invention discloses an automatic centering and damping brush component for a collector ring. The automatic centering and damping brush component for the collector ring comprises a brush and an automatic damping mechanism, wherein the automatic damping mechanism is used for mounting the brush and comprises a connector and two brush connecting plates; the two brush connecting plates are arranged at two sides of the connector respectively; one end of each brush connecting plate is hinged with the connector body and the other end is hinged with a fixed block connected with the brush; the brush connecting plates are in an elongated plate-like structure; the two brush connecting plates are connected with each other through an elastic element, so that the distance between the two brush connecting plates can change along with expansion and contraction of the elastic element; the middle part of the elastic element is supported on an extension plate of the connector; and the brush is hinged with the fixed block. The invention aims at providing the brush component which can still reliably contact a conductive ring in the radar collector ring under the conditions of strong impact and strong vibration.

The invention discloses a tension device for an automatic pipe welder. The tension device comprises a conical ejector block, a tension sleeve and a positioning platform from front to back in sequence;the middle of the conical ejector block is provided with a shaft clip matched with an inner rotary shaft, and the rear end of the conical ejector block is a conical surface body; the tension sleeve comprises a plurality of arc-shaped tension blocks, and the multiple arc-shaped tension blocks are connected together through telescopic springs to form the tension sleeve; the inner wall of the tension sleeve comprises a wedge surface matched with the conical surface body, and a columnar surface connected with an outer rotary shaft; and the rear end face of the tension sleeve makes contact with the positioning platform. Through the tension device, when two pipes which need to be subjected to butt welding and have the same pipe diameter standard are different in inner diameter, the two pipes are subjected to butt joint to sleeve the tension sleeve, the inner diameters of the two pipes can be adjusted to be the same through the tension sleeve, and the butt welding quality is ensured.

The invention relates to mass and center three-point supporting redundancy measuring equipment.The mass and center three-point supporting redundancy measuring equipment comprises three weighing assemblies, a center tray and a base.The center tray is used for carrying a tested object and provided with a positioning part for matched positioning of the tested object.The base supports a mass and center three-point supporting redundancy measuring equipment body.The three weighing assemblies are located between the center tray and the base and are evenly distributed in the circumferential direction.Each weighing assembly comprises an auxiliary weighing sensor, a sphere alignment assembly and a main weighing sensor which are arranged from top to bottom, wherein the auxiliary weighing sensor is stacked on the main weighing sensor through the sphere alignment assembly.According to the measuring equipment, test failures or test interruption caused by failures of weighing sensors is avoided in the process of a three-point supporting method, the other set of sensors can be used for reading numerical values if a certain sensor in one set of sensors breaks down, the phenomenon that the test process needs to be interrupted due to the failure of a certain sensor, and consequently repetition of the processes such as recalibration and reassembling is caused can be avoided, and the testing efficiency is improved.

The invention discloses a self-centering clamp used for a taper hole product. The self-centering clamp comprises a base. A mandrel is fixedly connected to the base. A taper sleeve is slidably arranged on the mandrel in a sleeving mode, and the taper sleeve is used for being inserted into a taper hole of the product to be machined so as to achieve radial positioning. The base is provided with an axial positioning face used for being in contact with the product to be machined. The self-centering clamp further comprises a detachable locking assembly, and the detachable locking assembly is used for pressing and fixing the product to be machined onto the axial positioning face so that the product to be machine can be prevented from moving in the axial direction of the mandrel. An elastic ejecting assembly is arranged between the base and the taper sleeve and used for making the taper sleeve and the taper hole be in contact fit tightly. The self-centering clamp has the advantages that the positioning accuracy is high, the stability and reliability are good, detachment is convenient, the product is not prone to being damaged, and the clamping efficiency is high. The self-centering clamp can adapt to products to be machined with different taper holes and clamping of different kinds of machining equipment (including lathing equipment, milling equipment, boring equipment, drilling equipment, rolling equipment, inserting equipment, grinding equipment and the like) by manufacturing multiple sets of bases and taper sleeves of different specifications.

The invention discloses an intelligent glass tube cutting robot. The intelligent glass tube cutting robot comprises a rack and a control system. The rack is provided with a piece picking device, a center positioning device, a cutting device and a conveying device, and the rack is also provided with a piece picking area, a processing area and a conveying area. The piece picking area is used for holding a to-be-cut glass tube, and the piece picking device is used for transferring the to-be-cut glass tube in the piece picking area to the processing area. The center positioning device and the cutting device are arranged in the processing area. The center positioning device is used for clamping and positioning the to-be-cut glass tube, the cutting device is used for cutting the to-be-cut glasstube, the conveying device is used for conveying the glass tube after cutting from the processing area to the conveying area, the conveying area is used for temporarily storing and outputting the glass tube after the cutting is completed, and the piece picking device, the center positioning device, the cutting device and the conveying device are all controlled by the control system. The intelligent glass tube cutting robot can improve the efficiency and quality of glass tube cutting, can reduce the production cost and can save manpower.

The invention relates to the technical field of agitating lorries, and discloses a support device, which is used for supporting an agitator drum of an agitating lorry. The support device comprises a riding wheel assembly, wherein the bottom end of the riding wheel assembly is fixed to a lorry body of the agitating lorry through an elastic device. The bottom end of the riding wheel assembly of the support device is fixed to the lorry body of the agitating lorry through the elastic device; and when the agitating lorry runs on bumpy and uneven roads quickly, the impact generated by the upward jumping of the agitator drum can be absorbed by the elastic device, so that the impact generated by the upward jumping of the agitator drum can be reduced, and the agitator drum and the riding wheel assembly are protected effectively. The invention also discloses the agitating lorry.

The invention discloses an inspection device for the coaxiality of a cylinder cover valve base hole and a guide pipe bottom hole, which comprises a dial indicator, and is characterized by further comprising a core shaft which is of a hollow structure is can be inserted in the guide pipe bottom hole, a core rod inserted at one end of the core shaft and a rotatable inspection device base arranged atone end of the core rod in a sleeved manner, wherein one side of the inspection device base is provided with a measuring lever which can be inserted into the valve base hole can be connected with theside wall of the valve base hole in a contacted manner, the lower part of the measuring lever and the inspection device base are provided with a first spring therebetween, and a measuring head of thedial indicator penetrates through the inspection device base and is connected with the upper part of the measuring lever in a contact manner; and the core shaft is internally provided with a positioning mechanical capable of automatically positioning the axis of the guide pipe bottom hole below the core rod. The inspection device is simple in structure and convenient to operate, can measure the coaxiality of the cylinder cover valve base hole and the guide pipe bottom hole quickly and accurately, greatly improves the measurement efficiency and accuracy and reduces the labor intensity and theproduction cost.

The invention provides an inner hole clamping device. The inner hole clamping device can solve the problem that a traditional spring sleeve cannot conduct reliable clamping or picking on small-inner-hole, large-dead-load and long-inner-hole workpieces, and accordingly the industrial machine automatic production requirement can be met. The inner hole clamping device comprises a core bar and a drivemechanism, the core bar is provided with an axial center through hole, the axial center through hole is internally provided with a pull rod in a penetrating manner, the pull rod can move in the axialdirection, the front end of the pull rod is connected with a pulling block, and the rear end of the pull rod is connected with the drive mechanism. Three sliding grooves which horizontally extend inthe axial direction and are parallel are evenly distributed in the peripheral face of the front end of the core bar in the circumferential direction. The groove bottom faces of the sliding grooves arewedge-shaped groove faces with the radial groove depths gradually increased from back to front. Each of the three sliding grooves internally contains a sliding claw, each sliding claw is provided with a wedge-shaped inclined face which is in sliding fit with the corresponding wedge-shaped groove, and the front end of each sliding claw is fixedly connected with the pulling block.

The invention discloses a gear shifting performance offline detecting device of a manual transmission. The device comprises X-axle, Y-axle and Z-axle linear modules; a rotating joint is added between the Y-axle linear module and the Z-axle linear module; a centering and torque measuring mechanism is fixed on a slide table of the Z-axle linear module; the rotating joint includes a stepper motor, a speed reducer, an adapting block, a support and a cross roller bearing; and the centering and torque measuring mechanism includes a stepper motor, a speed reducing structure, a first bracket, a torque sensor, an adapting block, a second bracket, a three-way force sensor, a cross roller bearing, a mandrel and a two-jaw cylinder. As the rotating joint is added between the Y-axle linear module and the Z-axle linear module, the Z-axle linear module can rotate around the Y-axle linear module to adapt the attitude variation of gear shifting rocker arm heads of manual transmissions with different model numbers; and the device has the advantages of automatic centering of a manipulator and a rocker arm, compact structure, easy assembly, integrated control and low cost.

A detaching-installing machine with locating and supporting roller driving units and following cover plate for the bearing holder of supporting roller is composed of big carrier, anti-tilting unit of said big carrier, fixed cover plate, detaching-installing frame, chain-type driver unit, and such units on said big carrier as the transversely movable left and right supporting plates, centering unit, the front and back following cover plates, electric oil coater, lift table, horizontal hydraulic cylinder for driving big carrier, transverse hydraulic cylinder for driving said supporting plates, lifting hydraulic cylinder, electric controller consisting of electric control cabinet and control panel, and hydraulic controller.

The invention discloses a multifunctional clamp for industrial robot teaching. The clamp is mainly formed by a clamp body and an automatic centering clamp head. The clamp body comprises a base, a sleeve, a fastening screw, a guide mandrel and a buffer spring. The base is in threaded connection with the sleeve, the guide mandrel is arranged in the sleeve and in sliding fit with the sleeve, the fastening screw is installed on the sleeve at the position opposite to the guide mandrel, the buffer spring is arranged between the guide mandrel and the base, a Mores cone spindle head is arranged at the tail end of the guide mandrel, a conical hole of the automatic centering clamp head is matched with the Mores cone spindle head at the tail end of the guide mandrel, and the clamp body is connected with the automatic centering clamp head through the conical hole and the Mores cone spindle head which are matched. The multifunctional clamp has the advantages of being simple in structure, low in cost, good in generality, convenient to clamp, high in accuracy, capable of achieving automatic centering, buffering and automatic abrasion compensation and capable of well meeting various teaching requirements.

The invention relates to an expansion drum device for tyre retreading and a tyre retreading method. The expansion drum device for tyre retreading comprises a first moving mechanism, a second moving mechanism and a supporting part at the tail end of the second moving mechanism, wherein the radial motion of the second moving mechanism is driven by virtue of the axial motion of the first moving mechanism; the first moving mechanism comprises a main shaft, a tapered shaft sleeved at the main shaft, and a driving mechanism used for driving the axial motion of the tapered shaft; the second moving mechanism comprises a radial shaft matched with the inclined surface of the tapered shaft; the radial shaft is clamped between a left tray and a right flange plate. The driving mechanism is used for driving the tapered shaft to move forward and backward in the axial direction, so that the radial shaft with the inclined surface at the lower end is driven to extend out at the same time, and therefore, self centering of a tyre is realized; the expansion drum device is simple in structure; a gas passage structure adopted by the expansion drum device is relatively simple, so that winding of a gas pipe caused by the rotation of an expansion drum is avoided, and the expansion drum device is safe and reliable and is convenient to use.

The invention provides an automatic multi-stage sleeve hydraulic cylinder mounting device comprising a main case body. A control device is arranged at one side of the main case body, a central clamping device is arranged on the main case body, a central limiting device is arranged at the tail end of the main case body, an abutting device is arranged at the head end of the main case body, and the central clamping device, the central limiting device and the abutting device are connected with the control device. The multi-stage hydraulic cylinder with the central clamping device, the central limiting device and the abutting device can be easily operated, automatic centering and assembling can be realized, quality reliability is guaranteed, and efficiency is increased; the workpieces are not lifted manually but pushed to convey, and working intensity is greatly reduced; the device is simple to operate and high in applicability, precise degree of assembling work is increased, assembling damage rate in an assembling process is reduced; and automatic control and special auxiliary devices are adopted, so that working intensity of workers is reduced and assembling efficiency is greatly increased.

An annular part grinding fixture comprises a taper handle shaft of hollow structure, an outer taper shaft, an inner taper shaft and a pushing disc. An outer taper face is arranged at one end of the outer taper sleeve, and an inner taper face is arranged at one end of the inner taper sleeve; the outer surface of the outer taper sleeve is sleeved with the inner taper sleeve, and the outer taper face of the outer taper sleeve is matched with the inner taper face of the inner taper sleeve; the outer taper sleeve is fixedly connected with the taper handle shaft, and the inner taper sleeve is fixedly connected with the pushing disc; and the pushing disc is arranged in the outer taper sleeve, and a plurality of axial opening gaps are formed in the outer taper sleeve in the circumferential direction. The annular part grinding fixture is simple in structure, convenient to use, capable of achieving automatic centering, and high in centering precision; and clamping force is controlled, so that clamping deformation can be reduced, and the machining precision is ensured.

The invention relates to the field of motor rotors, in particular to a center-adjusting device for pressing and assembling a bearing. The center-adjusting device for pressing and assembling the bearing comprises a supporting frame and a support which is used for accommodating the bearing to be assembled. A hole through which a rotating shaft to be assembled can pass is formed in the support, and a center-adjusting bearing assembly is arranged between the support and the supporting frame. An inner ring and an outer ring of the center-adjusting bearing assembly are connected with the support and the supporting frame respectively, the inner ring and the outer ring of the center-adjusting bearing assembly can mutually float, the axis of the inner ring and the axis of the outer ring can not be overlapped, and therefore the support connected with the outer ring can float relative to the supporting frame. When the bearing is pressed and assembled, the rotating shaft of a rotor penetrates through an inner hole of the bearing and then extends into the hole in the support in a hanging mode. When the axis of the bearing and the axis of the rotating shaft are not located in the same straight line, the support can swing in a deviation mode along with the extending of the rotating shaft until the axis of the bearing and the axis of the rotating shaft are overlapped. Therefore, the center can be automatically adjusted when the bearing is pressed and assembled, the concentricity of the bearing and the rotating shaft is guaranteed, and the quality of the rotator is improved.

The invention discloses a pneumatic control assembling device of a swivel joint. The pneumatic control assembling device comprises a workbench and a rocker arm. The surface of the workbench is provided with an annular shell centering base, the workbench on the two sides of the shell centering base is symmetrically provided with fixing frames, and the two fixing frames are provided with opposite embracing cylinders. The ends of piston rods of the embracing cylinders are connected with V-shaped embracing blocks, and the centers of the two V-shaped embracing blocks and the center of the shell centering base are placed in the same vertical plane. The center of the shell centering base is provided with a center through hole which penetrates through the surface of the workbench. A cylinder I is vertically arranged under the center through hole, a cylinder II which is connected to the rocker arm is vertically arranged over the center through hole, and a piston rod of the cylinder I and a piston rod of the cylinder II are opposite. The pneumatic control assembling device of the swivel joint has the advantages of being simple in structure, easy to operate, saving in manpower, capable of achieving automatic centering, easier to assemble and capable of improving production efficiency.

The invention discloses a hydraulic rapid automatic centering chuck which is suitable for processing machines such as machine tools and the like. The chuck comprises a clamping jaw assembly, a chuck body, a connector and a ball-screw hydraulic drive mechanism, wherein the clamping jaw assembly is provided with three or four jaws, the connector and the ball-screw hydraulic drive mechanism are arranged in the chuck body, the ball-screw hydraulic drive mechanism comprises a multi-head ball-screw assembly, a hydraulic oil cylinder and a hydraulic converter, the multi-head ball-screw assembly is composed of a multi-head lead screw and a ball nut, the hydraulic converter is connected with a hydraulic system, the multi-head all-screw assembly and the hydraulic oil cylinder are arranged in a spindle hole of a machine tool, and the hydraulic converter is communicated with the hydraulic oil cylinder. Hydraulic oil flows into the hydraulic oil cylinder through the hydraulic converter, so that a cylinder body of the hydraulic oil cylinder makes a forward-and-backward motion, and then pushes the ball nut to make a forward-and-backward motion and drives the multi-head lead screw to make a forward or backward rotating motion, the multi-head lead screw after extending to the inside of the chuck body is connected with the connector so as to drive the connector to operate, and the connector drives the clamping jaws to move radially to and fro through an Archimedes planar spiral disc.

The invention relates to a pneumatic abrasion-resisting angle stop valve which is small in size, light in weight, flexible to open, good in seal performance, resistant to abrasion and impact, easy to install, low in production cost and suitable for cutting off dust and ash dregs. The pneumatic abrasion-resisting angle stop valve comprises a valve body, a valve body sleeve, a valve base, a valve cover and a valve body neck bush, a valve rod, a valve clack sleeve and a valve clack are installed in the valve body, and a packing pad and a packing ring are arranged between the upper portion of the valve cover and the valve rod from bottom to top. The pneumatic abrasion-resisting angle stop valve is characterized in that a screw hole is formed in the valve cover, a round nut used for clamping a pneumatic device is installed at the upper end of the valve rod, the valve clack and the valve base are made of tungsten and cobalt hard alloy, the sealing face of the valve base and the valve clack is a conical face, the valve clack sleeve and the valve clack are connected through a spherical surface antifriction bearing, the lower end of the valve rod and the valve clack sleeve are connected in a conical face mode to achieve automatic centering, the lower end face of the valve rod is a spherical surface and makes contact with the upper end face of the valve clack for automatic center adjustment, and a lower end opening of a center through hole of the valve cover is a conical face to form an upper sealing point.

The invention provides a machine tool spindle trial run platform capable of simulating working conditions. A front spindle fixing support and a rear spindle fixing support are arranged on a working table and used for supporting the front portion and the rear portion of a spindle to be tested correspondingly. A displacement information acquisition mechanism used for acquiring displacement information of a check rod and an angle / speed measurement information acquisition mechanism used for acquiring rotation information of a spindle holder are arranged on the working table and correspond to the check rod at the front end of the spindle to be tested and the spindle holder. The front end and the rear end of the spindle to be tested are both provided with acceleration sensors and temperature sensors, and the acceleration sensors and the temperature sensors are used for acquiring vibration information and temperature information of the spindle to be tested in the running process. A driving motor used for driving the spindle to be tested to rotate, a motor position adjustment mechanism used for adjusting the horizontal position of the driving motor and a force sensor module used for acquiring the magnitude of tensile force of the driving motor during movement are arranged below the working table. A motor sheave of the driving motor is connected with a spindle sheave at the rear end ofthe spindle to be tested through a transmission belt. The machine tool spindle trial run platform capable of simulating the working conditions is a machine tool spindle dynamic performance test platform capable of realizing omni-directional system integration.

The invention discloses a multi-position thin-wall steel pipe welding device. The multi-position thin-wall steel pipe welding device comprises a welding machine conducting butt joint welding on thin-wall steel pipes, an auxiliary positioning mechanism for positioning the pipe ends of the thin-wall steel pipes, and a wire feeding mechanism for making up an butt joint seam occurring in the thin-wallsteel pipe butt joint welding process. The auxiliary positioning mechanism is mounted on one side of the welding machine, the wire feeding mechanism is arranged on the side face of the welding machine, and the wire feeding mechanism adapts to the butt joint welding position of the welding machine. According to the multi-position thin-wall steel pipe welding device, through a driving motor, a hollow rotary spindle is driven to rotate, thin-wall steel pipe bent heads or the multi-bent-head thin-wall steel pipes which need to be subjected to butt joint welding are arranged on a rotary seat in asleeving mode, butt joint welding between the bent heads and the straight steel pipes and between the bent head steel pipes is achieved, and meanwhile accurate welding can be conducted on the multiplepositions of the thin-wall steel pipes.

The invention provides an engagement fixture for square steel blade milling, and can solve the problems of long blade manufacturing period and high machining difficulty easily caused by positioning and clamping blades by a traditional engagement fixture. The engagement fixture for square steel blade milling comprises a turntable, and is characterized by further comprising an engagement clamping mechanism and a floating tip mechanism; the engagement clamping mechanism includes two engagement blocks and a lead screw translation structure; the lead screw translation mechanism is mounted on the turntable; the floating tip mechanism is arranged in the center position of the lead screw translation mechanism; and the two engagement blocks are respectively mounted on the lead screw translation mechanism, are positioned on two sides of the floating tip mechanism, and can oppositely or reversely move along the lead screw translation mechanism.