29results about How to "Increase preload" patented technology

The present application relates to the technical field of conductive trolley, in particular to a lifting type graphitization inner string furnace conductive trolley, which comprises a liftable frame, and further comprises a sliding mechanism, a sliding support part and a compensation mechanism, the compensation mechanism is provided with at least two, and two are arranged oppositely, one end of the compensation mechanism is connected with the sliding mechanism, and the other end is connected with a pressure regulating part. The liftable frame is arranged, so that the conductive trolley can be flexibly adjusted according to the actual height of the furnace head electrode, precise butt joint with electrodes of different heights can be completed without the help of external lifting equipment, and the convenience and adaptability of furnace charging and furnace discharging operation are improved. Through the cooperation of the pressure regulating part and the compensation mechanism, the spring pre-tightening force can be adjusted online, the push plate is driven to move and extrude the spring, the spring increases the pre-tightening force, so that the compensation mechanism can always provide stable and reliable compensation effect for the electrode, and the stability and reliability of electrode conduction are ensured.

This invention discloses a tab pre-compression device for bending the tabs of a battery cell wound on a winding needle. The device includes a shaft and a pre-compression unit mounted on the shaft. The shaft is parallel to the winding needle. The pre-compression unit includes a pre-compression surface for bending the tabs of the battery cell. The shaft is elastically mounted on a base, and a support unit is provided on the shaft. This support unit supports the battery cell and elastically compresses the shaft towards the base. This invention can pre-compress and bend the tabs at a specific angle during the battery cell winding process. Furthermore, it can gradually move away from the winding needle as the battery cell diameter increases to pre-compress and bend the outermost tabs of the battery cell, thus improving the tab pre-compression effect.

The invention discloses a wiring terminal production laser cutting device and process, and relates to the field of laser cutting devices.The wiring terminal production laser cutting device comprises a machine body, bases are symmetrically installed at the top of the machine body, and the tops of the bases are connected with a positioning plate through air cylinders; a dust collection wave tube is rotationally arranged at the top of the positioning plate, a swing range adjusting assembly for the dust collection wave tube is arranged in the positioning plate, the two sides of the dust collection wave tube are connected with the inner side faces of the long ends of side plates, and the side plates and the dust collection wave tube form a fan-shaped dust collection structure; a base plate is arranged on the outer end face of the positioning plate, a clamping spring is arranged between the outer end face of the positioning plate and the base plate, and a pre-tightening force adjusting assembly of the clamping spring is arranged in the positioning plate. According to the laser cutting device and process for wiring terminal production, through linkage operation of clamping positioning, synchronous dust collection range adjustment, reciprocating swing dust collection and pre-tightening force adjustment, wiring terminal clamping, cutting dust efficient cleaning and clamping force self-adaption are achieved, and the laser cutting quality is improved.

A return towing head for directional synchronous crossing of a main pipeline and an outer casing, relating to the field of pipeline crossing technology, includes an outer casing, a main pipeline, and a return towing head. Reinforcing plates are welded to the outer wall of the outer casing at equal intervals along the circumference. The return towing head includes a main body, with tie rods evenly spaced along the circumference at the ends of the main body. The tie rods can extend between two reinforcing plates, and a limiting plate is provided at the end of the tie rod. When the outer casing and the return towing head need to connect, the limiting plate is placed horizontally on the reinforcing plates on both sides, thus forming an effective connection. A central cylinder is provided inside the main body, and a top block is slidably mounted radially upward on the central cylinder. One end of the top block can abut against the inner wall of the main pipeline. A drag rod is slidably mounted axially upward on the central cylinder, and the drag rod has a conical portion. The other end of the top block can abut against the conical portion of the drag rod. When the drag rod is dragged outward, the conical portion pushes the top block out and presses it tightly against the inner wall of the main pipeline. Thus, this application achieves synchronous dragging of the outer casing and the main pipeline by the return towing head.

The present application belongs to the technical field of aviation piston engine. The present application discloses a kind of cylinder body structure and connecting method of air-cooled two-stroke aviation piston engine, to solve the problem of heat load concentration, aluminum alloy strength decline, cylinder deformation caused by the contact thermal resistance of aluminum alloy cylinder and cylinder cover connection area is too large, in the present application, connecting screw and threaded hole are matched with fine thread to increase contact area, reduce contact thermal resistance and enhance heat conduction performance;Threaded hole counterbore is treated to reduce the amount of residual gas in the hole, reduce the obstruction of gas to heat conduction;Connecting anti-loosening strictly prohibits the use of thread glue, to avoid local temperature rise. And using TC4 titanium alloy screw material, threaded hole circumferential uniform arrangement and enough connection depth and other supporting design, systematically make the heat of connection area conduct and dissipate efficiently, avoid the strength decline caused by heat load concentration, improve the anti-deformation ability of cylinder, ensure that the roundness and cylindricity of cylinder meet the design requirements, the engine performance maintains stable under design condition.

This invention discloses a bearing press-fitting device, comprising: a machine base, a positioning plate disposed below the machine base, positioning screws disposed at each of the four corners of the positioning plate, the other end of the positioning screws passing through the machine base and extending above it, a press-fitting plate fitted over the four positioning screws and sliding on their exterior, and a buffer protection assembly for supporting the press-fitting plate disposed outside the positioning screws; the buffer protection assembly includes an adjusting seat and a return spring, wherein the return spring is disposed above the adjusting seat for supporting the press-fitting plate, and the adjusting seat is slidably disposed on the outer wall of the positioning screws for adjusting the extension space of the return spring to increase its preload. The bearing press-fitting device proposed in this application uses an adjusting seat to adjust the extension space of the return spring, increasing the preload of the return spring, avoiding elastic fatigue of the return spring after long-term repeated compression, which would cause the press-fitting plate to fail to fully return to its original position, reducing the trouble of replacing the return spring and lowering maintenance costs.

The utility model discloses a heat exchanger with a plate-type structure, which comprises a plate-type heat exchanger component, a fixed plate, a clamping movable plate, a rear support, an upper guide rod, a lower guide rod, a bolt rod and a heat exchange plate sheet, wherein the fixed plate, the clamping movable plate and the rear support are vertically parallel, the upper guide rod, the lower guide rod and the bolt rod are horizontally parallel, and the heat exchange plate sheet is arranged between the fixed plate and the clamping movable plate; the blocking frame comprises a blocking plate fixed to the upper guide rod and the lower guide rod through bolts, an attaching plate fixed to the clamping movable plate through bolts and a transmission piece installed between the blocking plate and the attaching plate, and the transmission piece comprises a fixing block perpendicular to the blocking plate, a bolt shaft penetrating through the fixing block and a rotating arm rotationally connected with the bolt shaft; through the designed blocking frame and the damping seat, under the synergistic effect of the blocking frame and the damping seat, the purpose of abutting against the clamping movable plate is achieved, the pre-tightening force of the clamping movable plate is further increased, a pressure sensor transmits a signal to an alarm lamp, the risk that the clamping movable plate and a heat exchange plate of the plate heat exchanger are loosened and leakage exists is reminded, and the plate heat exchanger has the reminding function.

This utility model discloses an integrated vulcanized sealing seat for a wedge brake self-adjuster, including a support frame. A vulcanized sealing ring is provided on the top of the support frame, and an oil seal spring is provided at the edge of the top of the vulcanized sealing ring. This utility model, by assembling a vulcanized sealing ring on the top of the support frame, provides good toughness and tensile strength after vulcanization, suitable for supporting and adjusting the brake. The top of the outer side of the vulcanized sealing ring is provided with an oil seal spring, ensuring high sealing performance and preventing external impurities from entering. An integrally formed auxiliary leak-proof outer ring is sleeved and engaged on the outer sides of the first and second mounting rings, providing auxiliary sealing. An auxiliary sealing ring is provided on the inner side of the vulcanized sealing ring, creating a sealed inner and outer connection that is not easily detached or leaking. This results in excellent sealing performance and anti-detachment capabilities, stable interference fit, improved preload, and automatic compensation of interference fit even with continuous wear of the sealing ring, demonstrating excellent durability and protective properties.

This application discloses a pipe clearing device, including a clearing body, the clearing body including an air storage chamber and a pressure regulating component, the pressure regulating component being configured to regulate a preset air pressure in the air storage chamber. The pressure regulating component is characterized by comprising an regulating body, a regulating valve, an operating component, and an elastic element. The regulating body has a pressure relief hole communicating with the air storage chamber; the regulating valve is configured to open and close the pressure relief hole; the operating component is configured to be adjustable in position relative to the regulating body along the moving direction of the regulating valve; the elastic element is disposed between the regulating valve and the operating component; when the positions of the operating component and the regulating body are adjusted along the moving direction of the regulating valve, the elastic potential energy of the elastic element is changed to adjust the preset air pressure in the air storage chamber. Compared with the prior art, and compared with traditional fixed springs or mechanical limiting structures, this design significantly improves the flexibility and adaptability of air pressure regulation.

This utility model relates to the field of lithium-ion battery technology, specifically to a battery module, including an insulating cover, a sampling plate, a module bracket, multiple battery cells, two end plates, two side plates, and a bottom plate. The bottoms of the two end plates are detachably connected to both ends of the bottom plate, and the bottoms of the two side plates are detachably connected to both sides of the bottom plate. The bottom plate, insulating cover, two side plates, and two end plates enclose the battery module housing. The sampling plate, module bracket, and multiple battery cells are arranged sequentially below the insulating cover. The sampling plate is detachably connected to the module bracket. The tops of the two side plates and two end plates are detachably connected to the module bracket. The insulating cover is fastened to the module bracket. This utility model improves the space utilization and structural stability of the battery module. The end plates are fixed to the module bracket and insulating cover of the housing, and the side plates are fixed to the module bracket. This improves the overall structural stability and strength of the battery pack, and also enhances the overall safety of the battery pack.

This invention relates to a design method for a high-rigidity riveted wheel hub bearing unit, belonging to the technical field of wheel hub bearing units. The wheel hub bearing unit structure includes a flange with splined mounting holes. An outer ring is movably fitted onto the flange. An inner ring, nested and riveted to the flange, is located between the rear of the outer ring and the flange. A cage is provided between the front of the outer ring and the flange, and between the inner and outer rings. The cage contains several steel balls movably nested within it, with a contact angle of 35°±3°. This method solves the problem of riveting pressure being transmitted from the flange to the inner ring, causing deformation of the inner ring. It increases the axial preload, which in turn increases the preload force, resulting in higher bearing rigidity. This improves the rigidity of the bearing, increases its impact resistance, and extends its service life.

The utility model discloses a face cream tank, which relates to the field of cosmetic packaging, and adopts the technical scheme that the face cream tank comprises a tank body and a screw cap, the top end of the tank body is fixedly connected with a threaded section matched with the screw cap, the top surface of the threaded section is provided with a plurality of slots, elastic blocks are arranged in the slots, and the top surfaces of the elastic blocks are higher than the top surface of the threaded section. The elastic block abuts against the screw cap. An upward force is applied to the screw cap through the elastic block, so that the pressure between the threaded section and the screw cap is increased, and the pre-tightening force between the threaded section and the screw cap is improved, so that the pre-tightening force between the screw cap and the threaded section does not completely depend on the extrusion between the screw cap and the tank body after the screw cap is tightened, and the connection strength and the sealing performance between the screw cap and the tank body are ensured; the tank body and the threaded section are both made of HDPE materials, so that the tank body and the threaded section have good rigidity, and the structural stability of the inserting groove and the threaded section is guaranteed.

This utility model discloses a stable pole-mounted circuit breaker, which includes a mounting plate and a pole-mounted circuit breaker body. The pole-mounted circuit breaker body has mounting portions on both sides. The mounting plate has a first recessed cavity with an opening to accommodate the mounting portions, and a second recessed cavity corresponding to the first recessed cavity is provided on the back of the mounting plate. Pressure plates are inserted into the first and second recessed cavities, with one pressure plate abutting against the mounting portion. The pressure plates are configured as an integrated structure. The pressure plates abut against the sidewalls of the recesses to reduce the lateral swaying of the pole-mounted circuit breaker body. A grooved locking fastening assembly and a second protective assembly using spring force improve connection reliability and pre-tightening force. Simultaneously, the first and second protective assemblies block humid air, water vapor, and rainwater, preventing corrosion and rust of the fastening components, ensuring their strength and fastening performance, reducing the risk of loosening, and improving the product's protective performance.

This invention provides a rope deployment and retrieval device for capturing small celestial bodies using a tethered satellite, belonging to the field of deep space exploration technology. The invention features two symmetrically mounted rope rollers on a support frame. One end of each roller is connected to a servo motor. One end of the rope is wound around the roller, and the other end passes through a rope straightener and enters a straightener ring, then passes through the gap between a fixed control wheel and a sliding control wheel, and finally extends out of the housing through a rope outlet hole. A smooth rod is fixed to the support frame at both ends, passes through a smooth hole in the rope straightener in the middle, and a threaded rod passes through a threaded hole in the rope straightener and connects to a second servo motor. The fixed control wheel is connected to a support via a third bearing, and the fixed control wheel is connected to a transmission gear, which in turn is connected to a fourth servo motor. This invention enables the deployment and retrieval of the rope and allows control over the rope's deployment and retrieval length, speed, and acceleration, laying the foundation for the capture of small celestial bodies using a formation ring system and holding significant importance for small celestial body exploration missions.

The utility model relates to the technical field of engine bearing bushes, and discloses an automobile engine bearing bush structure which comprises two bearing caps, two fixing blocks are fixedly connected to the outer portions of the bearing caps, a rotating block is rotationally connected to the close sides of every two fixing blocks, and bolts are fixedly connected to the upper side and the lower side of each rotating block. The outer portions of the bolts are sleeved with strong springs, the upper ends and the lower ends of the strong springs are both fixedly connected with gaskets, the outer portions of the bolts are in threaded connection with nuts, the close sides of the two bearing covers are both fixedly connected with buffering assemblies used for damping, and the close sides of the two buffering assemblies are both fixedly connected with bearing bush bodies. And a plurality of rollers are movably connected to the interiors of the close sides of the two bearing bush bodies. According to the bearing bush, the bearing cover can be effectively prevented from loosening due to vibration, impact and the like, so that the stability of the bearing bush in the working process is ensured, and the service life of the bearing bush is prolonged.

The utility model belongs to the technical field of machine manufacturing, and relates to an anti-falling bolt and nut assembly connecting structure. The device comprises an automatic bolt feeding and conveying component (A) and a bolt heating component (B), the automatic bolt feeding and conveying component (A) comprises a conveying channel (1) and a compressed air supply pipeline (2), the compressed air supply pipeline (2) is arranged at one end of a channel inlet (3) of the conveying channel (1), and the bolt heating component (B) is arranged at one end, close to a channel outlet (4), of the conveying channel (1). The anti-falling bolt and nut assembly connecting structure is simple in structure, automatic feeding and heating of bolts are achieved, pre-tightening force is achieved after bolt and nut assemblies are connected, and the anti-falling performance of nuts is effectively improved.

The utility model relates to a labeling machine, in particular to a quick labeling machine with a discharging function. Comprising a base, a feeding mechanism and a labeling mechanism are arranged on the upper side of the base, a discharging mechanism is arranged on one side of the feeding mechanism, and a tensioning mechanism is arranged at the top of one side of the labeling mechanism and used for tensioning a label belt. According to the utility model, in the operation process of the labeling machine, the coil spring is always kept in a rolling state to provide tension for the labeling machine, the tension drives the rotating rod and the connecting plate to rotate, and the rotating connecting plate drives the guide roller to move to apply tension to the label tape, so that the label tape is kept in a tensioning state; the pre-tightening force of the coil spring cannot be eliminated, the worker rotates the mounting shell to further wind the outer end of the coil spring so as to increase the pre-tightening force of the coil spring, at the moment, the stretching stroke of the coil spring is expanded to enable the guide roller to have a larger moving distance, and the label tape which is excessively loosened is tensioned again.

The utility model discloses a valve fastening device which comprises a first fastening piece and a second fastening piece, the first fastening piece and the second fastening piece abut against the peripheral side face of a valve deck, the first fastening piece and the second fastening piece are oppositely distributed in the radial direction of the valve deck, and the first fastening piece and the second fastening piece are connected through a connecting piece. The first fastening piece and the second fastening piece can clamp the valve cover and keep relative fixation with the valve cover, and at least one of the first fastening piece and the second fastening piece is provided with the positioning block capable of being matched with the torque wrench, so that the small torque wrench can be matched with the positioning block and drive the positioning block to rotate, and the valve cover can be clamped by the first fastening piece and the second fastening piece. The valve cover is driven by the first fastening piece and the second fastening piece to rotate synchronously so as to pre-tighten the valve cover and the valve body, so that a narrow space can also provide a mounting space and a moving space for a small torque wrench, the pre-tightening force between the valve cover and the valve body is improved, and potential safety hazards in the operation process of the valve are reduced.

This utility model discloses a high-sealing through-hole connector, including a housing with a horizontal end and a vertical end. A receiving groove is formed on the horizontal end, and a receiving slot is formed on the vertical end. An inner core I is disposed within the receiving slot, and a terminal I is disposed within the inner core I. A insertion hole is formed on the outer circumferential surface of the inner core I. An inner core II, adapted to the inner core I, is disposed within the receiving slot. An axial limiting structure is provided between the inner core II and the horizontal end. At least a portion of the inner core II extends into the insertion hole, and a terminal II fixedly connected to the terminal I is engaged on it. A circumferential limiting structure is provided between the terminal II and the inner core II. The advantages of this utility model are mainly reflected in its ingenious design. The axial and circumferential limiting structures work together to quickly position and connect the housing, inner core II, and terminal II. This operation is simple and convenient, requiring no additional positioning or limiting structures, greatly saving costs and facilitating disassembly and installation, thus significantly improving work efficiency.

The utility model relates to the technical field of rear steel plate spring, and disclose a kind of rear steel plate spring structure with adjustable pre-tightening force, adjusting mechanism is provided on U-shaped clamping plate, fixed mechanism is provided on adjusting mechanism, adjusting mechanism includes plug-in assembly and restriction component, plug-in assembly includes cylinder barrel and threaded rod, and the periphery of cylinder barrel top is respectively fixedly connected with telescopic plugboard, long rod top is fixedly connected with handle.The rear steel plate spring structure with adjustable pre-tightening force, threaded rod is inserted into steel plate spring, the stress state of steel plate spring can be changed, to realize the adjustment of pre-tightening force, by the rotating number of control screw rod, the purpose of controlling pre-tightening force size can be achieved, when telescopic plugboard is stretched and inserted in slot, square board is inserted in square slot, clamping block is clamped in clamping groove, the position of threaded rod can be fixed, avoid long-term to appear loose and fall off situation, guarantee that steel plate spring can exist buffering, shock absorption and support vehicle body's effect.

The utility model discloses a high -strength anti -loosening bolt fastener, specifically related to fastener technical field, including the screw cap, the screw cap bottom fixedly connected with the bolt, be provided with the limit component on the screw cap, limit component includes the connecting shell, the connecting shell bottom fixedly connected with the first threaded rod opposite with the bolt thread direction, first threaded rod outside is connected with the screw cap inside thread, and is through the screw cap and the bolt inside thread connection, and the screw cap and bolt material quality are all carbon steel. The utility model discloses through setting limit component and auxiliary mechanism, first threaded rod can form bidirectional locking structure with the bolt, can obviously promote the anti -loosening performance of bolt, help to promote the pre -tightening force and the anti -relaxation ability of bolt, can limit the rotation degree of freedom of nut through two bolts, can assist the nut and bolt cooperation, makes the bolt can keep stable after connecting.

The utility model discloses a battery which comprises a shell, a battery cell and an insulating film, the battery cell comprises a positive pole lug and a negative pole lug, and the positive pole lug and the negative pole lug are positioned at two opposite ends of the battery cell; the insulating film comprises a bottom, a first side wall and a second side wall, and thickening areas are arranged on the side edges, close to the positive pole lug and the negative pole lug, of the first side wall and the second side wall. Compared with the prior art, the thickening area is arranged on the insulating film, so that the gap between the thinning area of the pole piece of the battery cell and the shell can be effectively reduced, and the pre-tightening force of the thinning area of the pole piece is enhanced, so that the large surface of the battery cell is stressed more uniformly, and the lithium precipitation risk of the battery is reduced.

This utility model provides a grinding machine for eyeglass hinges, belonging to the field of eyeglass parts processing technology. It solves the technical problems of low grinding efficiency and poor effect of existing eyeglass miniature parts grinding. This eyeglass hinge grinding machine includes a frame (1), and a housing (2) is fixed on the frame (1). The machine is characterized by having a roller (3) rotatably mounted on the frame (1), the roller (3) being connected to a transmission mechanism that enables it to rotate, a spiral impeller (4) fixed inside the roller (3), a material inlet (5) opened on the cylinder wall of the roller (3), a material gate (6) provided at the material inlet (5), a drain outlet (7) opened on the cylinder wall of the roller (3), a filter screen (8) provided at the drain outlet (7), and a gate (9) for sealing the drain outlet (7). This utility model has the advantages of simple structure and good grinding effect.

The invention discloses a lithium battery edge trimmer which comprises a shell, a motor and a battery pack for supplying energy to the motor are arranged in the shell, a mounting plate is formed at the end of an output shaft of the motor, and a plurality of transmission shafts extending in the axial direction are annularly arrayed on the end face of the mounting plate; the transmission shaft penetrates through the sliding part, the sliding part axially slides on the transmission shaft, a reset spring is arranged between the sliding part and the mounting plate, a locking sleeve used for locking the sliding part is rotationally connected to the outer wall of the sliding part, a chuck part is axially formed at the end of the sliding part, an assembly hole is axially formed in the chuck part, and the locking sleeve is sleeved with the assembly hole. A thread is formed on the inner wall of the assembly hole; the working head is assembled in the assembly hole in a threaded fit manner; the clamping and pressing mechanisms are arranged on the two sides of the shell in pairs and used for clamping and fixing the working head, and each clamping and pressing mechanism comprises a button, a pressing spring and a clamping piece which are arranged in the radial direction.

The utility model provides an anti-falling and anti-leakage one-way throttle valve, and belongs to the technical field of throttle valves. The problem that in the prior art, a valve element of a throttling valve is prone to axial movement or radial deviation is solved. The throttle valve comprises a valve body, a main body section of the valve body is of an integrally-formed structure and is of a regular cylinder structure, connecting ports are arranged at the left end and the right end of the valve body, fine threads are arranged outside the connecting ports on the two sides of the valve body, and a main flow channel, a throttle control channel and an oil inlet channel are formed in the valve body. The throttling control channel and the oil inlet channel are located on the same side of the valve body, the main flow channel is located on the other side of the valve body, the main flow channel is communicated with the oil inlet channel and then communicated with the throttling control channel, the oil inlet channel is located above the throttling control channel in an inclined mode, and the outer side hole diameter of the throttling control channel is larger than the inner side hole diameter of the throttling control channel. A spring cavity is formed in the position, close to the outer side, of the throttling control channel, and a spring assembly is arranged in the spring cavity. The utility model has the advantages of anti-drop and anti-leakage performance and stable structure.

The present disclosure relates to the technical field of anchor rod, and particularly relates to a NPR constant resistance anchor rod pre-tightening force applying device. The technical scheme comprises: a connecting assembly for connecting with the end of the anchor rod, one end of the connecting assembly is detachably fixedly connected with the end of the anchor rod, and the other end of the connecting assembly is fixedly connected with the power shaft of the force applying device; a locking assembly comprising a rotating locking anchor rod nut; the connecting assembly is connected with the end of the anchor rod, the power shaft of the force applying device tightens the anchor rod, and the end of the main cylinder abuts against the anchor rod tray. The present disclosure fixes the end of the anchor rod with the power shaft of the force applying device by means of the connecting assembly, replaces the manpower with the power of the force applying device to pull the anchor rod, and the main cylinder abuts against the anchor rod tray under the reverse force, so that a larger pre-tightening force is generated between the anchor rod tray and the anchor rod; finally, the anchor rod nut is rotated by means of the locking assembly, so that the anchor rod nut is locked and fixed under the current pre-tightening force by replacing the manpower wrench.

The present application belongs to the technical field of human body artificial limb, and particularly relates to a foot-ankle artificial limb with adaptive adjustment of buffer stiffness, which comprises a foot plate, an ankle joint connecting seat is fixedly arranged on the foot plate, a rotating shaft is fixedly arranged on the ankle joint connecting seat, a supporting seat is rotatably connected to the rotating shaft, a supporting cylinder is fixedly arranged on the supporting seat, and an ankle joint elastic reset unit and an ankle joint damping adjustment unit are arranged on the two sides of the supporting seat respectively. The gait sensing unit is used to detect the gait in real time, and the buffer stiffness adjustment, the ankle joint damping adjustment and the electromagnetic damping energy return unit are cooperatively controlled by the electric control unit, so that the synchronous adaptive adjustment of the equivalent buffer support stiffness and the ankle joint rotating damping of the foot-ankle artificial limb is realized. The foot-ankle artificial limb can not only ensure the soft foot feeling during walking and the stable support during running, but also can inhibit the rebound impact of the buffer spring and convert the rebound kinetic energy into electric energy for recovery, so that the walking comfort, the running support and the rebound damping performance are effectively improved.

The utility model belongs to the technical field of knob adjusting wrench, disclose a knob adjusting wrench for bearing measuring instrument, including handle and the first knob part and the second knob part connected with both sides, the central region of first rotation part is provided with first cross head, the four sides of first cross head are the arc of outward bending, the four corners of first cross head are the arc of inward bending, the arc of first cross head four sides and the arc of first cross head four corners are tangent, the central region of second knob part is provided with second cross head, second cross head is provided with the concentricity of second knob part, the four sides of second cross head are the arc of inward bending, the four corners of second cross head are the arc of inward bending, the arc of second cross head four sides and the arc of second cross head four corners are tangent, the utility model has improved the pre-tightening force, has reduced single time adjustment time and the adjustment number of times of measuring process, can adapt the adjustment knob of a variety of model bearing measuring instrument, and the manufacturing cost is low.

The application relates to a preparation method of a square battery shell stretching die steel sleeve and a hard alloy concave die, raw materials of the hard alloy concave die are obtained by a ball milling dry granulation process to obtain a mixture, the mixture is pressed and formed, is milled and shaped, is sintered in a sintering furnace, and after being cooled to room temperature, a hard alloy concave die product is obtained; the hard alloy concave die product is subjected to cryogenic treatment and tempering treatment after being sintered and before being sleeved; the shape of the hard alloy concave die product is processed into an ellipse or a racetrack shape; the steel sleeve is subjected to heat treatment; the steel sleeve has a cavity matched with the shape of the hard alloy concave die, and the hard alloy concave die and the steel sleeve are assembled into an integrated whole by using a hot embedding process. Scientific material formula is adopted to improve the fracture toughness of the hard alloy concave die itself; the steel sleeve and the hard alloy concave die are subjected to heat treatment to remove internal stress of the materials; the shape structure of the hard alloy concave die, the structure of the steel sleeve and the alloy sleeve are optimally designed to improve stress diffusion and improve the pre-tightening force of the steel sleeve on the hard alloy concave die.