70results about How to "Sufficient preload" patented technology

An electrochemical cell structure has a first fluid chamber and a resilient member disposed in the first fluid chamber. An opening permits communication of fluid into the first fluid chamber. An anode cavity and a cathode cavity are in fluid communication with the fluid chamber through the opening.

A method for automatically adjusting a level of tension in web media being transported in a roll-fed web media transport system, comprising: receiving web media from a source roller, feeding the web media through an S-shaped media path in an automatically-adjusting tensioning mechanism where the web media is wrapped around curved surfaces on first and second tensioning shoes, and pulling the web media through the automatically-adjusting tensioning mechanism using a feed mechanism. The tensioning mechanism includes: a bracket assembly mounted to a frame which is adapted to freely pivot around a pivot axis. A pivot angle of the bracket assembly automatically adjusts in response to differences in a coefficient of friction between the web media and the tensioning shoes such that the tension in the web media has a reduced level of variability relative to configurations where the bracket assembly is held in a fixed position.

A gas turbine is provided. The gas turbine includes at least one rotor, having rotor blades arranged on the periphery of rotor disks in a plurality of radial planes, and a tie-bolt extending along slots in the rotor disks and holding the rotor disks together as a unit. At least one annular spacer for fixing the position of the tie-bolt in relation to the center line of the rotor disks is also provided. The spacer includes through-openings that are arranged radially in relation to the tie-bolt or to its center line and that extend coaxially.

A tray for underground coal mine anchor rod supporting comprises a tray back layer and a tray belly layer; the tray back layer comprises a tray back layer swell part, a tray back layer flat part and a tray back layer anchor rod through hole; the tray belly layer comprises a tray belly layer bulge part, a tray belly layer barrel part and a tray belly layer anchor rod through hole; the elasticity modulus of a tray back layer manufacturing material is greater than that of a tray belly layer manufacturing material; the tensile strength of the tray back layer manufacturing material is greater than that of the tray belly layer manufacturing material. The tray can provide greater pretightening force, and meanwhile, can prevent the tray and a rod body thread part of an anchor rod from being damaged due to stress concentration.

The invention discloses a full-automatic pneumatic grinding machine which comprises a rack and a dust collecting chamber. A grinding device is arranged in the dust collecting chamber; a material conveying device for inputting and outputting materials to the dust collecting chamber is arranged at the lower end of the grinding device; an adjustable fixture for clamping the materials is arranged on the material conveying device; an air blowing device for blowing away workpiece grinding ash is further arranged in the dust collecting chamber; and a powder dust outlet is formed in the bottom surfaceof the dust collecting chamber and is connected with a dedusting device. The full-automatic pneumatic grinding machine provided by the invention is high in adaptability, wide in use range, and capable of automatically dedusting a workpiece during grinding and being prevented from causing harm to a human body and an air environment; and secondly, a sufficient pre-tightening force or a precompression force can be ensured, and a cutter can strictly move vertically, so that the grinding size is accurate, and a grinding effect is greatly improved.

The invention discloses a turbine disc and blade locking mechanism for a turboprop engine. The turbine disc and blade locking mechanism comprises a turbine disc and a plurality of blades which are uniformly distributed at the periphery of the turbine disc, wherein mortise structures are uniformly distributed at the periphery of the turbine disc; each mortise structure is composed of a first mortise at the outer side and a second mortise at the inner side, and the first mortise communicates with the second mortise; the root parts of the blades are provided with tenon structures; each tenon structure is composed of a first tenon and a second tenon on the end part of the first tenon; the first tenons are embedded into the first mortises; the second tenons are embedded into the second mortises, and are locked and fixed through blocking plates embedded between the second tenons and the seond mortises. According to the turbine disc and blade locking mechanism for the turboprop engine disclosed by the invention, the blades are matched with the turbine disc though the tenons and the mortises, so that only the locking plates need to insert and bend, and therefore, operations are simple; andmoreover, the turbine disc and blade locking mechanism is novel in design, is simple and convenient in assembly, is high in practicability, is excellent in stable performance, and can be widely applied to turbines of various functions.

The invention provides a heat pipe sealing structure, which includes a partition and a sealing block. The partition is provided with a partition hole, the heat pipe passes through the partition hole, the partition isolates the cold flow section and the hot flow section of the heat pipe, and the sealing block is welded on the heat pipe. And pass through the partition hole together with the heat pipe. The upper part of the sealing block is provided with a sealing plate, and the lower part is provided with an external thread section. The external thread section is screwed with a compression nut. By rotating the compression nut, the sealing plate of the sealing block and the partition The upper surface is tightly pressed. The invention has the advantages of simple structure, convenient processing and good sealing performance.

The invention relates to the technical field of tablet preparation, and discloses a tablet preparation device for avoiding tablet splitting. The tablet preparation device for avoiding the tablet splitting includes a material box and is characterized in that the interior of the material box is fixedly connected with a rotating shaft in a sleeving mode, the bottom end of the material box is fixedlyconnected with a conveying tube, the bottom of the conveying tube is fixedly connected with a feeding opening, the outside of the rotating shaft is fixedly connected with a connection disk in an inserted mode, the inside of the connection disk is fixedly connected with an electromagnet, a spring is movably connected to the bottom end of the connection disk, and is located on the outer side of theelectromagnet, a ball screw is movably connected to the inner part of a guide rail, the bottom end of the ball screw is fixedly connected with a male die, and the bottom end of the rotating shaft is rotatably connected with a female die seat. According to the tablet preparation device for avoiding the tablet splitting, magnetism is generated through the electromagnet to adsorb the guide rail, theconnecting disk and a fixing block are driven to rotate through the rotating shaft, thus the female die is transported above a male die, the ball screw is used in combination with the guide rail and the electromagnet in order to achieve the effects of sufficient pre-pressure and long extrusion time.

The invention discloses a supporting device of a bulb turbine unit. The supporting device comprises a horizontal supporting mechanism and a vertical supporting mechanism. The horizontal supporting mechanism comprises a supporting rod, a first foundation plate connected with a runner foundation, and a piston device connected with one end of the supporting rod. The other end of the supporting rod is connected with an engine bulb of the bulb turbine unit, and a gap is reserved between an elastic ball-shaped supporting base and the first foundation plate. The vertical supporting mechanism comprises an upper supporting base, a middle supporting base, a lower supporting base and a second foundation plate connected with the runner foundation. The middle supporting base and the lower supporting base are connected through a tightening screw rod, and the tightening screw rod is sleeved with a first bulb base. The pretightening effect is achieved through elastic deformation of the elastic ball-shaped supporting base, floating force of water borne by the engine bulb is offset, and therefore the bulb turbine unit can safely operate for a long time.

The invention provides a gas cylinder installation device. The gas cylinder installation device is characterized in that a support assembly is formed by splicing hoops, each hoop is composed of a base and a hoop ring, each base is integrally formed by a plane and an arc surface vertical to the plane, limiting strips extend out of the arc surfaces towards the direction away from the circle center, and the hoop rings are clamped on the arc surfaces and fixed by the planes and the limiting strips. According to the invention, the support assembly is formed by splicing the hoops, and gas cylinders are firmly fixed by the clamping force of the hoops; arc-shaped structural components on the bases are used for installing the hoops and preventing the hoops from moving in the longitudinal direction; the support assembly is compact in structure and small in occupied space, few processes and short time are needed for installation of the support assembly, and therefore the production time can be saved, the cost can be lowered and the production efficiency can be improved.

The invention discloses a high-pressure fluid pulsation control test platform, which comprises a test bed, a servo motor, a torque sensor, an axial plunger pump and a fluid pulsation control device; the servo motor, the torque sensor and the axial plunger pump are sequentially arranged, and the servo motor is connected with the torque sensor through a transmission shaft; the torque sensor is connected with the axial plunger pump through a transmission shaft, the high-pressure output end of the axial plunger pump is connected with the input end of the fluid pulsation control device through a pulsation high-pressure pipeline, the output end of the fluid pulsation control device is connected with the input end of the stable high-pressure pipeline, and the output end of the stable high-pressure pipeline is connected with a load. A front pressure transmitter is arranged on the pulsating high-pressure pipeline, a rear pressure transmitter is arranged on the stable high-pressure pipeline, andthe front pressure transmitter and the rear pressure transmitter are both electrically connected with the data acquisition instrument. By means of the impedance composite principle, the problems of fatigue damage of high-pressure pulsation to a hydraulic system and the like can be solved, and the operation stability of the device is improved.

The invention relates to an integrated insulating joint. The joint comprises a left steel short pipe, a right steel short pipe, a left flange, a right flange, a joint sleeve, a first insulated sealing piece, a second insulated sealing piece, an insulated filling material and an insulated sealing ring, wherein an external thread is formed in the outer wall of the left steel short pipe; an internal thread is formed in the inner wall of the left flange; the external thread formed in the outer wall of the left steel short pipe and the internal thread formed in the inner wall of the left flange are matched to form a fixed connection mode; the threads through which the left steel short pipe and the left flange are in threaded connection are matched at the two starting ends so as to realize angle joint structure welding; an external thread is formed in the outer wall of the right steel short pipe; an internal thread is formed in the inner wall of the right flange; the external thread formed in the outer wall of the right steel short pipe and the internal thread formed in the inner wall of the right flange are matched to form a fixed connection mode; and the threads through which the right steel short pipe and the right flange are in threaded connection are matched at the two starting ends so as to realize angle joint structure welding. The yield of the finished product is high, the production cost can be greatly reduced, the production period is shortened, the joint is safe, and the standard specification is met.

The invention relates to a modular test box for an experiment sample of a space material. The modular test box comprises a box body, a box cover, a mounting tray and a plurality of sample modules, thebox cover is hinged to the box body, sample trays are mounted on the inner sides of the box body and the box cover respectively; each sample module comprises a mounting supporting structure and a sample material, the mounting supporting structure is detachably connected to the mounting tray, the sample material is limited and supported on the mounting supporting structure, and the exposed surfaceof the sample material is arranged towards the side deviating from the mounting tray. The test box can realize in-orbit tests of a material in extremely harsh environments such as space atomic oxygendenudation, space high and low temperature alternation, space high-energy particle radiation, microgravity, ultrahigh vacuum, space debris/micro-meteor body impact, and the like. Meanwhile, ground laboratory installation, water removal, gas removal, dust removal treatment, on-orbit disassembly and replacement and disassembly operation after returning to the ground are facilitated; and the aerospace characteristic requirements of compact structure, small size, light weight and reliable mechanical property in the rocket launching ascending stage are met.

The invention relates to a power transmission line strain clamp convenient for robot maintenance, and belongs to the technical field of electric power fittings.The strain clamp comprises a drainage plate, a drainage wire clamp, a pressing rivet bolt, a flange nut and a marking gasket. A terminal plate of the drainage wire clamp is a curved-surface outer toothed plate and is provided with a through groove and outer teeth; the drainage plate is a curved-surface internal tooth plate, is provided with a bolt hole, an operation hole and internal teeth, is in close fit with the drainage wire clamp through meshing of the external teeth and the internal teeth, is in fastening connection through the pressing rivet bolt, the flange nut and the marking gasket, and is reliably prevented from loosening; and the lower end of the through groove is aligned with the operation hole, and the flange nut, the marking gasket, a manipulator and an operation tool can penetrate through the through groove so that assembly, disassembly and maintenance are safe, reliable and convenient, and ventilation is also facilitated. The marking gasket is provided with a color-changing rubber ring and a marking plate, the color of the color-changing rubber ring, the bending degree of the marking plate and contact traces can be obtained by shooting visible images, whether overheating occurs or not, the magnitude of fastening pre-tightening force and the installation and operation state are judged, and robot inspection and maintenance are facilitated.

The invention discloses a device for fixing an expansion water tank for a passenger car with a rear-mounted engine. The device is characterized by comprising a water tank base and at least two water tank clamping hoops, wherein the water tank base is a rectangular framework; each water tank clamping hoop is in a banded structure, and openings of the water tank clamping hoops face to the same side; two ends of each water tank clamping hoop are fixed on the water tank base, and the shape formed by the water tank clamping hoops is matched with the outer contour of the water tank. The bracket assembly of the expansion water tank for the passenger car with the rear-mounted engine, provided by the invention, is formed by splicing of the clamping hoops and the base, and the expansion water tank is firmly fixed by the clamping force of the clamping hoops. The assembly is provided with few components, and is simple in structure. The mounting bracket assembly is compact in structure, occupies small space, and needs few mounting procedures so as to require few working hours, so that saving production man-hour is facilitated, reducing cost is facilitated, and improving the production efficiency is facilitated.

The invention relates to a split-type hydraulic press rack comprising a first frame, a second frame, locating keys, a supporting leg, supporting leg anchoring parts, pull rods and pull rod anchoring parts; the first frame is vertically mounted on the top end of the supporting leg; one side of the first frame is provided with the locating keys; locating key holes are formed in one side of the second frame; the first frame is fitted with the second frame by fitting the locating keys with the locating key holes; and the first frame and the second frame are vertically fixed on the supporting leg by the supporting leg anchoring parts. By changing the structure of the split-type hydraulic press rack, the rack is not needed to be hoisted again after being assembled, so that the problem that an ultralarge hydraulic press rack cannot be wholly hoisted because of being ultraheavy is solved; and the whole hoisting of the rack is simplified to form only single frame hoisting, so that the hoisting difficulty is lowered, it is convenient for production staff to operate equipment, the production cost is reduced, the service life of the rack is prolonged, and the market prospect is wide.

The invention relates to a combined type end plate and a prefabricated pile. End plate consumables can be effectively saved, the connecting firmness between a longitudinal main rib and the end plate of the prefabricated pile is guaranteed, and mounting is convenient. The combined type end plate comprises an end plate body. The combined type end plate is characterized in that multiple evenly-distributed mounting holes are formed in the end plate body, and internal threads or clamping grooves are formed in the mounting holes; and connecting parts are further included, external threads or bucklesare arranged on the connecting parts, the connecting parts are in screw joint with the internal threads or clamping grooves of the mounting holes through the external threads or buckles, connecting structures capable of being connected with the longitudinal main rib are arranged on the connecting parts, in the combined type end plate, tensioning force generated during prestress tensioning is nottransmitted through the end plate body through screw joint and clamped joint between the connecting parts internally provided with anchoring counterbores and the end plate body, finally, the tensioning force is borne by the connecting parts and the thread positions or clamped joint positions of connection of the connecting parts and the end plate body, then the end plate body can be effectively thinned, and the end plate body can be made to have the cross section the same as that of the concrete pile.

The invention provides a split type spherical outer ring roller bearing. The inside of a bearing outer ring is provided with two bearing inner rings, and two roller racks in which rollers are arranged are arranged between the bearing outer ring and the two bearing inner rings; the outer surface of the bearing outer ring is spherical; and the roller racks are disconnected with the bearing outer ring and the bearing inner rings. For the split type spherical outer ring roller bearing adopting the structure, when the bearing axially swings, the bearing wholly swings, so that the rollers are evenly stressed, the bearing capacity is greatly improved, the bearing can be loaded with enough pre-tightening force when assembled, the bearing capacity applied on the bearing is even, and the service life of the bearing is prolonged. The bearing has the advantages of big bearing capacity, long service life and the like, and can be widely applied to rotary mechanical parts.

The invention discloses a carbon fiber cloth composite concrete bridge deck seamless expansion joint. Concrete bridge deck slabs are arranged below an asphalt paving layer; the concrete bridge deck slabs are arranged on the two sides of a groove; the lower ends of steel bar embedded parts are arranged in the concrete bridge deck slabs; the upper ends of the steel bar embedded parts are arranged inthe asphalt paving layer; the steel bar embedded parts comprise a left steel bar embedded part and a right steel bar embedded part; the steel plate is arranged between the left steel bar embedded part and the right steel bar embedded part, the steel plate is arranged above the groove, the U-shaped grooves are bilaterally symmetrical along two sides of the groove, PAN-based carbon fiber cloth is wound on the left steel bar embedded part and the right steel bar embedded part, and the rest parts outside the groove are expansion joint fillers. According to the structure construction method for enhancing the anti-reflection crack performance of the bridge seamless expansion joint starting from the source of crack generation, the high-elasticity high-modulus fiber cloth is used for bearing thetransverse tensile stress of the seamless expansion joint, generation and expansion of reflection cracks are prevented, and then reflection cracks of an additionally-laid asphalt surface layer are reduced or prevented.

The invention discloses a novel bolt connection structure. The bolt connection structure comprises an upper connecting plate, a lower connecting plate, a bolt and a nut. Unthreaded hole are formed in the upper connecting plate and the lower connecting plate. The bolt is inserted into the connecting plate from bottom to top. The extending-out end of the upper connecting plate is fastened through the nut. Countersunk head grooves are formed in end portions of the unthreaded holes of the upper connecting plate and the lower connecting plate. Roughing treatment and relative post-processing are conducted on surfaces of the countersunk grooves, so that connection strength of the bolt is enabled to be more reliable. According to the novel bolt connection structure, countersunk groove structures are formed in the end portions of the unthreaded holes of the connecting plates in the bolt connection structure, the countersunk head grooves can gain high surface roughness after the roughing treatment is conducted on the surfaces, so that the nut is enabled to produce enough pre-tightening force and good anti-skidding capacity at fastening connection time. Meanwhile, the countersunk groove structure design is adopted, so that utilization of a gasket or a washer is eliminated, assembling procedures of bolt connection is reduced, and production cost is reduced to a certain degree.