49results about How to "Increase preload" patented technology

The present invention relates to the field of vacuum monitoring technology, and in particular to a vacuum preloading soil vacuum degree monitoring system and method, the monitoring system comprising: a plurality of acquisition modules, a plurality of vacuum degree sensors, a first comparison module generation module, a second comparison module, a marking module, a division module, a third comparison module and an adjustment module; obtaining the preloading data of each monitoring point in the target area, and determining whether the preloading conditions of each monitoring point meet the preset standards; analyzing the preloading data of each monitoring point, and classifying and marking each monitoring point according to the analysis results; dividing the target area into regions according to the classification and marking results, and determining the actual operation mode of each vacuum pump according to the regional division results. The present invention can effectively identify problems existing in the preloading process, timely adjust the operation mode of the vacuum pump, ensure the optimization of the preloading effect, improve the utilization rate of equipment such as vacuum pumps, and reduce resource waste.

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 invention relates to the technical field of optical devices, in particular to an optical adjusting frame, an optical testing device and an adjusting method of the optical adjusting frame. The optical adjusting frame comprises a fixed support, an adjusting support, a first elastic part and a second elastic part. The adjusting support is provided with a first driving part and a second driving part, one end of the first elastic part is connected to the fixing support, the other end of the first elastic part is connected to the adjusting support, the first elastic part is driven by the first driving part, and the first driving part is configured to adjust the compression or extension state of the first elastic part; one end of the second elastic part is connected to the fixing support, the other end of the second elastic part is connected to the adjusting support, the second elastic part is driven by the second driving piece, and the second driving piece is configured to adjust the compression or extension state of the second elastic part. The rigidity of the first elastic part is larger than that of the second elastic part. The optical testing device comprises the optical adjusting frame. The adjusting precision of the optical adjusting frame can be improved.

The utility model discloses a combined vibration massage component, relates to vibration device technical field, including vibration component and install vibration motor on the vibration component, the vibration component includes conducting strip and connecting strip, conducting strip and connecting strip fixed connection, the bottom of vibration component is equipped with first motor seat, the first motor seat is equipped with second motor seat, the second motor seat is equipped with second motor seat. The bottom of the vibration motor is fixedly connected with a second motor base, through holes are formed in the four corners of the second motor base and the four corners of the first motor base, bolts are arranged in the through holes in a sleeved mode, and the vibration assembly is located between the second motor base and the first motor base. According to the combined type vibration massage assembly, different vibration and using effects can be achieved, the effects of large-scale vibration, local vibration and prolonging of the service life of the vibration assembly are achieved, and the situations of plastic deformation and elastic deformation of the vibration assembly caused by long-time vibration are avoided.

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.

The utility model provides an underwater high-definition cable. The underwater high-definition cable comprises a wire rod, a sealing piece, a pressing assembly, a connecting assembly and a supporting ring. The wire rod comprises a wire rod main body and a wire rod coating layer wrapping the wire rod main body; the sealing element is annularly arranged at the periphery of the wire rod coating layer; the pressing assembly is arranged on the periphery of the wire rod in a surrounding mode and arranged on the side, away from the wire rod coating layer, of the sealing piece in a pressing mode so that the sealing piece can be tightly attached to the wire rod coating layer. The connecting assembly is arranged on the periphery of the wire rod in a surrounding mode and used for being connected between the pressing assembly and the waterproof shell in a sealed mode. The support ring is arranged around the circumference of the wire rod main body, and is clamped between the wire rod main body and the wire rod coating layer, or is positioned in the wire rod coating layer, or is positioned on the outer surface of the wire rod coating layer; the projection of the support ring along the radial direction of the wire body in the support ring at least partially coincides with the sealing member. The supporting ring is arranged to support the sealing element, so that the sealing element can be prevented from excessively extruding the cable, a cable core in the cable is prevented from being broken, and the signal transmission stability and waterproof depth of the high-definition cable are improved.

The utility model discloses a high-strength bolt connecting structure which comprises a basic part and further comprises a reinforced connecting structure, the reinforced connecting structure comprises a part to be installed in butt joint with the basic part, a lower hole and an upper hole are formed in the butt joint portions of the basic part and the part to be installed respectively, and an expansion sleeve is installed in the middle of the upper hole and the lower hole in an inserted mode. Wing plates are arranged on the periphery of the expansion sleeve, and self-tapping screws are installed in the wing plates in a screwed mode. An extrusion plate is arranged in the expansion sleeve, outer expansion blades are arranged on the back of the extrusion plate on the expansion sleeve, an inner expansion sleeve is inserted into the expansion sleeve, inner expansion blades are arranged on the edge of the inner expansion sleeve, threads are arranged on the inner side of the inner expansion sleeve, a frame plate is arranged on the top of the inner expansion sleeve and fixedly connected with the edge of the expansion sleeve, and a main bolt is screwed into the surface of the threads. And a mounting hole is formed in one side of the main bolt. According to the utility model, through the arrangement of the reinforced threaded connection structure, the positioning and stabilizing effects of the device are improved by adding a three-point positioning type auxiliary positioning mode on the outside.

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.

The invention provides a pre-tightening force enhanced type spin riveting blind bolt. The pre-tightening force enhanced type spin riveting blind bolt comprises a core rod, and a driving body, an expansion ring, a forming sleeve, a nail body, a locking ring and a spinning bushing which are arranged on the core rod in a sleeving manner, wherein the core rod is of a slender rod structure, the tail end of the core rod is connected with the riveter chuck, a broken diameter groove is formed in the middle of the core rod, and an end head is arranged at the head end of the core rod; the driving body, the forming sleeve and the nail body are of an integrally-arranged tubular structure, the forming sleeve forms a flexible deformation area, a containing cavity used for containing the expansion ring is formed in the forming sleeve, and the driving body is connected with the head end of the core rod in a clamped mode. The spinning bush is of a rotary body structure internally provided with a stepped hole, the locking ring is arranged in the stepped hole and connected with the end face of the stepped hole of the spinning bush in a meshed mode, and a shearing groove is formed in the outer ring of the spinning bush. The core rod pulling and rotating combined motion mode is achieved, the pre-tightening force of a product can be improved by 50% or above, and the connecting requirement of a high-clamping-force connecting part can be better met.

The invention discloses a high-prepressing mildew-proof antibacterial tough vegetable protein adhesive and a preparation method thereof, and the adhesive comprises the following components in parts by mass: soybean protein, acrylamide, methacryloyloxyethyl trimethyl ammonium chloride, a cross-linking agent, ammonium persulfate, a metal-polyphenol catalyst, a protein cross-linking agent and a dispersion medium. The preparation method comprises the following steps: weighing the components according to the mass ratio, dispersing the acrylamide, the methacryloyloxyethyl trimethyl ammonium chloride, the cross-linking agent, the ammonium persulfate and the protein cross-linking agent in the dispersion medium, uniformly stirring, uniformly dispersing the soybean protein in the prepared dispersion liquid, and uniformly dispersing to obtain the soybean protein gel. According to the preparation method, the soybean protein is taken as a raw material, and the problem of poor pre-pressing property of a protein adhesive in the prior art is solved through room-temperature polymerization of monomer acrylamide and methacryloyloxyethyl trimethyl ammonium chloride by taking the soybean protein as a raw material.

The utility model relates to the technical field of stirrup tools, and particularly discloses a simple stirrup tool which is characterized by comprising a stirrup body, a stirrup groove is formed in the stirrup body, and limiting grooves are formed in the two sides of the stirrup groove; a connector is fixedly arranged on the stirrup body; a handle is arranged at one end of the connector, and a connecting rod is arranged on the handle and is in threaded connection with the connector arranged on the stirrup body. The utility model aims to solve the problems that a stirrup tool is easy to rotate and deviate during stirrup and is not flexible enough.

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 embodiment of the invention provides a fan which comprises an impeller, a fan blade and a fan blade. A first housing accommodating the impeller; the second shell is arranged on one axial side of the first shell and is matched with the first shell; a motor disposed on one side of the impeller in the axial direction and housed in the second housing; a rotating shaft which is attached to the impeller, is driven by the motor, and rotates together with the impeller; and a bearing disposed on the outer periphery of the rotating shaft and supporting the rotating shaft. Wherein a pre-pressing part and a pre-pressing supporting part which are in contact with each other in the axial direction are arranged between one axial side of the impeller and the other axial side of the bearing, the pre-pressing part and the pre-pressing supporting part are made of different materials, and the pre-pressing part or the pre-pressing supporting part is in contact with the bearing. According to the fan, the pre-pressure applied to the bearing can be increased in the axial direction, and in addition, the noise of the fan can be reduced.

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.

The utility model belongs to the technical field of building construction, and particularly relates to an advanced sealing device for a straining beam at a post-cast strip of a portal rigid frame structure. The advanced sealing device is composed of a top die and two side dies and is installed between two sections of straining beams through opposite-pull screws, and a sealed space used for later concrete pouring is formed. And meanwhile, a pouring pipe is arranged on the top die in a communicating mode, pouring concrete is poured into the closed space through the pouring pipe, and the two straining beam sections are connected in a pouring mode. In addition, due to the detachable extension pipe design, the landfill height can be adjusted, and universality is improved. Meanwhile, through the design of a sealing cover, a first sealing cushion layer, a second sealing cushion layer and the like, foreign matter is prevented from entering the closed space, and the structural strength and stability are ensured. The device has the advantages of being simple in structure, low in manufacturing cost, capable of being repeatedly used and the like. According to the utility model, the structural strength, the service life and the safety of a building are improved. And meanwhile, the construction cost and the manpower demand are reduced, and the national architectural concept of saving materials is responded.

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 present application relates to a micro differential pressure transmitter, which includes a hollow shell, sleeves are arranged on the opposite inner side walls, and the axes of the opposite sleeves overlap, and there is a gap between the ends close to each other, and the spacing of the gap is adjustable; a balancing diaphragm is arranged at the gap; a balancing spring is partially arranged in the sleeve, and the part exposed from the sleeve is connected to the balancing diaphragm. The balancing spring is arranged in the sleeve, and the sleeve can support the balancing spring. When the balancing diaphragm is impacted by gas, the sleeve can reduce the swing range of the balancing diaphragm by limiting the range of movement of the balancing spring, and can reduce the swing of the balancing diaphragm, improve the measurement accuracy, and at the same time can reduce the damage of the balancing diaphragm due to excessive swing amplitude. The gap between the opposite sleeves can be adjusted, so that the sleeve can adjust the movement range of the balancing diaphragm, and then adjust the pressure measurement range.

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 invention provides a crowbar type chain tensioner, and belongs to the technical field of logistics transportation instruments. The chain type tensioner solves the problems that an existing chain type tensioner product is large in size and high in manufacturing cost, and meanwhile larger pre-tightening force can be achieved. The crowbar type chain tensioner comprises a main support, a chain wheel connected to the main support and a chain collecting support capable of driving the chain wheel to rotate during swinging, a chain is wound around the chain wheel, the chain collecting support is in a U-shaped plate shape, the open end of the chain collecting support is rotationally connected to the chain wheel, and the closed end of the chain collecting support is fixedly connected with a crowbar sleeve. One end of the crowbar sleeve faces the chain wheel, and the crowbar sleeve is perpendicular to the chain wheel. When the tensioner is used, a user can achieve pre-tightening of the tensioner more easily through the crowbar, so that operation is more labor-saving and convenient, and larger pre-tightening force can be achieved.

The invention relates to a high-speed heavy-load ball screw pair which comprises a ball screw and a ball nut matched with the ball screw, a raceway is formed between the ball screw and the ball nut, and the ball screw is driven by a driving unit to rotate to drive the ball nut to do linear motion along the ball screw; the two ends of the interior of the pipe wall of the ball nut are each provided with a ball return channel arranged in the axial direction of the ball nut. The ball nut is provided with two return grooves corresponding to each ball return channel, the return grooves are communicated with the ball return channels, return devices are arranged in the return grooves, circulation channels are defined by the two return devices, the ball return channels and the roller path, the two circulation channels are not communicated with each other and are respectively provided with a ball circulation chain, and the lead screw pair is high in bearing capacity and stable in operation. And the requirement of high-speed operation can be met.