86results about How to "Increase load capacity" patented technology

The invention provides an elevator with a single-cylinder and double-cylinder switching mode and a using method of the elevator. The elevator comprises a first single-cylinder elevator, a second single-cylinder elevator and a rope adjusting clutch connected between the first single-cylinder elevator and the second single-cylinder elevator. The rope adjusting clutch comprises a bearing seat, a shaft seat inner gear ring and two fixed hubs, the shaft seat inner gear ring is rotationally connected with an inner ring of the bearing seat, the two fixed hubs are connected to a main shaft of the first single-drum elevator and a main shaft of the second single-drum elevator respectively, each fixed hub is connected with a rope adjusting outer gear ring capable of sliding in the axial direction of the fixed hub, and the rope adjusting outer gear rings are connected with the bearing seat. The rope adjusting outer gear ring is connected with a shifting ring, and the shifting ring is connected with a telescopic mechanism fixed to the single-barrel elevator. When the telescopic mechanism stretches out and draws back, the shifting ring drives the rope adjusting outer gear ring to be meshed with or separated from the shaft seat inner gear ring. And switching between two modes of independent operation of the two single cylinders and synchronous operation of the two cylinders can be realized.

The invention discloses a multi-rotor aircraft with lift-enhanced wings, which comprises rotor power devices, a fuselage for mounting airborne equipment and connecting the rotor power devices, and a pair of independent and controllable lift-enhanced wings, the high-lift wings are mounted on the fuselage; when the multi-rotor aircraft with the high-lift wings flies, a flight control algorithm controls the tilting angles of the high-lift wings according to the attitude and the flight speed of the aircraft, so that the high-lift wings are in a proper attack angle state, and proper lift force can be provided for the aircraft. The flying speed can be increased, the cruising ability is improved, and transportation and storage are convenient.

The utility model relates to the technical field of electric tilting valves, and discloses a novel electric tilting valve which comprises a supporting pipe, annular connecting plates are fixedly connected to the front end and the rear end of the supporting pipe respectively, a plurality of mounting holes are formed in the middles of the annular connecting plates, and annular limiting grooves are formed in the front end and the rear end of the supporting pipe respectively. The middle of the inner wall of each annular limiting groove is fixedly connected with an annular rubber ring, the annular rubber rings and the limiting grooves are arranged, the rubber rings are embedded in the annular limiting grooves in the two ends of the supporting pipe, double sealing is formed through pressing, and the leakage problem caused by vibration or deformation of a traditional valve body is solved; the installation holes in the annular connecting plate support rapid flange installation, the sealing face is evenly stressed, local stress concentration caused by traditional bolt direct connection is avoided, the servo motor and the rotating shaft are arranged, the rotating angle of the rotating shaft is controlled through the servo motor, and linear adjustment of flow or pressure is achieved.

The invention relates to the technical field of urban construction, in particular to a kerb and tile visual grabbing control system. A kerb and tile visual grabbing control system comprises a visual identification module, a system control module and a six-axis mechanical arm module, the six-axis mechanical arm module comprises a mechanical arm main body and an auxiliary control assembly, the mechanical arm main body is used for grabbing and laying kerbs and tiles, and the auxiliary control assembly is used for controlling the mechanical arm main body. The mechanical arm body comprises a supporting arm, a lifting arm, a swing arm and a mechanical claw which are sequentially and rotationally connected, and the auxiliary control assembly is connected between the front end of the supporting arm and the front end of the swing arm and used for supporting the mechanical arm body and reducing the equipment load. According to the mechanical arm, the torque generated to the front end of the swing arm when the mechanical claw grabs a heavy object can be effectively shared, the load of each joint motor is greatly reduced, and therefore the structural rigidity and the movement stability of the whole mechanical arm under the heavy-load and large-arm-span working conditions are enhanced, and the precision and stability of the laying action are ensured.

The utility model relates to the technical field of planar motors, and provides a planar motor with a supporting structure, which comprises a mover, a stator and a supporting structure, the mover and the stator are arranged at intervals along the vertical direction, a permanent magnet is arranged in the mover, a plurality of electromagnetic coils are arranged in the stator, and the supporting structure is arranged on the mover. The electromagnetic coil and the permanent magnet act to enable the mover to be supported above the stator in a suspended mode, a first installation groove is formed in the side face, facing the stator, of the mover, or a second installation groove is formed in the side face, facing the mover, of the stator, and one side of the supporting structure is arranged in the first installation groove or the second installation groove. And the other side of the supporting structure is movably connected with the stator or the rotor, so that the rotor can horizontally move relative to the stator. By arranging the supporting structure, magnetic suspension supporting and rigid supporting of the supporting structure exist between the rotor and the stator at the same time, the load capacity of the rotor can be improved, the moving resistance of the rotor can be reduced, and the motion precision of the planar motor can be guaranteed.

The utility model discloses a grain depot fumigation tablet autonomous delivery robot which comprises a chassis, damping mechanisms and a medicine delivery mechanism, the damping mechanisms and the medicine delivery mechanism are arranged on the chassis, the damping mechanisms are symmetrically arranged on the left side and the right side of the chassis, and each damping mechanism comprises a support fixed to the left side and the right side of the chassis; the direct-current motor, the driving wheel, the crawler belt, the driven wheel, the connecting shaft and the spring suspension shock absorber are installed on the support, a medicine feeding mechanism is installed at the top of the chassis and comprises a medicine bin fixed to the front end of the top of the chassis, a push plate is installed at the bottom of the medicine bin in a sliding mode, and a medicine pushing rack is fixed to the rear side of the push plate; by arranging driving wheels, ten driven wheels driven by two driving wheels on a crawler belt and a damping system provided with a spring suspension damper, a robot body is reinforced and enlarged, the load capacity is greatly improved, horizontal pushing type medicine feeding is adopted, and compared with a traditional mechanical arm, the method has the advantages that the tablet feeding cost of a robot is reduced, and the design is simple.

This utility model discloses a production fixture for turning diesel engine cylinder heads, including a worktable with legs installed at the bottom and a baffle fixed at the top. A guide mechanism is provided at the top of the worktable, and an L-shaped plate is fixed to the top of the guide mechanism. A pressing mechanism is provided on one side of the worktable. A guide groove is formed at the top of the worktable, and guide rails are installed on both sides of the inner wall of the guide groove. A slider one is slidably connected to the inner wall of the guide rails and is fixedly connected to a connecting block. A sliding groove is formed at the bottom of the guide groove, and a slider two is fixed to the bottom of slider one. This utility model provides guidance for the L-shaped plate during its movement through the guide mechanism. Simultaneously, the pressing mechanism drives the L-shaped plate to move, preventing it from retracting due to the reaction force of the cylinder head. Furthermore, the guide mechanism ensures that the clamping force generated by the pressing mechanism when holding the cylinder head is consistent, preventing cylinder head deformation due to uneven force.

A belt retainer roller has a plurality of rollers and a retainer (2) that retains the rollers. The retainer (2) includes a pair of annular members (4) facing both axial ends of each roller, and a plurality of column portions (5) that are disposed at equal intervals in the circumferential direction across the outer diameter portions of the pair of annular members (4) for the rollers to be fitted into. An inner diameter portion of each annular member (4) is provided with a roller retaining claw (6) for preventing the rollers from falling toward the inner diameter side of the retainer. A retainer radial chamfer length (B) and a retainer wall thickness (A) satisfy the following relationship: 0 < B / A ≤ 1.6.

The present invention relates to the technical field of protein biological functions, in particular to a polypeptide, a fusion type multimeric protein and use thereof, the polypeptide is selected from: (1), a polypeptide having a substitution mutation in at least one position selected from the group consisting of positions 16, 25, 29, 49 and 58, as compared with a natural C structural domain of a protein A as shown in SEQ ID NO.1; wherein, the position 16 is subjected to a substitution mutation into leucine or valine; the position 25 is subjected to a substitution mutation into lysine, arginine, histidine or tryptophan; the position 29 is subjected to a substitution mutation into alanine, leucine or threonine; the position 49 is subjected to a substitution mutation into arginine or histidine; and the position 58 is subjected to a substitution mutation into glycine, isoleucine or alanine; or (2) a polypeptide having at least 80% of sequence identity to the polypeptide in (1) and retaining substitution mutation in at least one position selected from the group consisting of positions 16, 25, 29, 49 and 58; the polypeptide has high alkali tolerance and high loading capacity.

The application relates to the technical field of drug delivery, in particular to a ZIF-8 / PDA composite material and a preparation method and application thereof. The ZIF-8 / PDA composite material provided by the application has good feasibility in terms of loading and delivering curcumin. The ZIF-8 material is modified by polydopamine, and the loading effect of the ZIF-8 material as a carrier on drugs is improved. The characterization results show that the drug loading performance of ZIF-8@PDA is obviously improved. The in-vitro release experiment results show that CuR@ZIF-8@PDA has more significant pH response drug release characteristics, shows good inhibition on Staphylococcus aureus and Escherichia coli, the hemolysis rate is 3.1%, is within a safe range, the inhibition on HepG2 cells is stronger than that of CuR@ZIF-8, and more obvious oxidative stress reaction and cell apoptosis can be induced.

The utility model provides a small sliding table air cylinder which comprises a base and a sliding table located above the base, and a crossed linear rail is arranged between the base and the sliding table so that the sliding table can form the freedom degree of sliding in the front-back direction of the base. A longitudinal air cylinder, a longitudinal piston and a piston rod are arranged in the middle area, in the width direction, of one end of the sliding table, a fixing plate is arranged at one end of the base, and the tail end of the piston rod is matched with the fixing plate to exert force to drive the sliding table. Two first air connecting openings communicating with the two ends of the longitudinal air cylinder correspondingly are formed in the side portion of the sliding table. The utility model has the advantages of compact structure, strong bearing capacity, good rigidity and stable operation.

The invention discloses a composite adsorption material for synergistically removing ammonia gas and sulfide in a pet environment and a preparation method of the composite adsorption material, and belongs to the technical field of environment functional materials and gas purification. According to the composite adsorption material, zeolite and attapulgite are used as a porous inorganic matrix, an interface adhesion layer is constructed on the surface of the porous inorganic matrix through dopamine oxidation auto-agglutination, histidine-iron coordination is introduced to form enzyme-like active sites, meanwhile, a reversible sulfur capture structure is constructed through mercaptoacetic acid, a proton transfer network is constructed through phytic acid, and the porous matrix is subjected to synergistic modification; on the basis, zinc chloride, ferric nitrate, sodium carboxymethyl cellulose and polyvinyl alcohol are combined to prepare the composite adsorption material. According to the invention, by constructing a multi-stage synergistic system of bionic enzyme active sites, a dynamic sulfur capture structure and a proton transfer network, efficient synergistic removal of ammonia gas and hydrogen sulfide is realized, the stability and recycling performance of the material in a high-humidity environment are remarkably improved, and the material has a good application prospect.

The utility model discloses a coaxial duplex gear integrated electric drive axle which comprises a motor, a planetary gear and a differential mechanism. The hollow shaft is transversely arranged in a rotor cavity of the motor and is fixedly connected with a rotor; the right end of the hollow shaft penetrates through the motor and is fixedly connected with a sun gear of a planetary gear; a planetary gear I of the planetary gear is meshed with an inner gear ring of a differential mechanism; an inner hole in the right end of the differential mechanism is fixedly connected with a right half shaft and is linked with a right hub assembly connected with the other end of the right half shaft; an inner hole in the left end of the differential mechanism is fixedly connected with a left half shaft and linked with a left hub assembly connected with the other end of the left half shaft; the left half shaft penetrates through a shaft cavity of the hollow shaft. The motor and the speed reducer are integrated on the axle, so that the output shaft of the motor is coaxial with the wheels, and design and installation of the electric drive axle are facilitated; the power assembly integrated structure design is adopted, the transmission efficiency is improved, and the power transmission distance is reduced; the structure is compact, light weight is facilitated, the weight can be obviously reduced, the size is reduced, the loading weight and the endurance mileage are effectively improved, and high practicability and wide applicability are achieved.

The utility model belongs to the technical field of welding, and discloses a wall-climbing welding robot which comprises a chassis, a driving assembly, a mechanical arm and a welding assembly, the driving assembly is installed at the bottom of the chassis, the mechanical arm is installed on the chassis, the welding assembly is installed at the end of the mechanical arm, and the driving assembly comprises a support, an AGV motor, advancing wheels, a servo motor, magnetic attraction wheels and a synchronous belt. The two advancing wheels are installed at the two ends of the support in parallel, the two AGV motors are installed on the side wall of one side of the support and connected with the opposite advancing wheels, the synchronous wheel is hollow, the magnetic attraction wheel is rotatably installed on the inner side of the hollow advancing wheel, and the servo motor is installed on the support and connected with the magnetic attraction wheel through the synchronous belt. The independent hollow driving wheel is driven by the AGV motor, and a plurality of permanent magnets distributed in a Halbach array are mounted on the magnetic attraction wheel in a matched manner, so that the magnetic attraction force is ensured, the weight of the welding robot is reduced, and the load capacity and adaptability of the welding robot are improved.

The application relates to the technical field of robots, in particular to a one-body continuum manipulator for grabbing. The manipulator comprises a driving mechanism, a coupling manipulator arm body and a grabbing mechanism which are sequentially connected; the coupling manipulator arm body is provided with driving ropes which are circumferentially distributed; the coupling manipulator arm body comprises a flexible rod and a plurality of spherical friction bodies which are sleeved on the flexible rod; the plurality of spherical friction bodies are sequentially connected in a head-to-tail mode; a serpentine spring which is circumferentially distributed is arranged between adjacent spherical friction bodies; and the bottom of the coupling manipulator arm body is provided with an electromagnetic rigidity adjusting assembly which is used for adjusting the friction force of the plurality of spherical friction bodies to realize the rigidity adjustment of the coupling manipulator arm body. The one-body continuum manipulator for grabbing adopts the continuum joint of the coupling of the serpentine spring and the spherical friction body, realizes the rigidity adjustment, improves the load capacity under the condition of guaranteeing the flexibility.

The application belongs to the field of oligonucleotide synthesis, and particularly relates to a styrene / nitrogen-containing heterocyclic copolymer and a glass carrier and a preparation method and application thereof. The modified styrene / nitrogen-containing heterocyclic copolymer has a structure shown in formula (2'). The key of the application is that the nitrogen-containing heterocyclic compound and the alkyl ether fragment are introduced into the polystyrene molecular chain, which can effectively improve the effective load of nucleotides, and compared with the nitrogen-containing heterocyclic compound introduced into the oligonucleotide synthesis system alone and the styrene / nitrogen-containing heterocyclic copolymer system without the alkyl ether fragment, the synthesis efficiency and purity of the oligonucleotide can be significantly improved, and the application is particularly suitable for long-chain oligonucleotide synthesis. Formula (2')

The present application relates to the field of heating smoking set, specifically to a kind of heating smoking set control method, heating smoking set and storage medium, the control method includes the following steps: step one: controller starts first heating loop;Step two: controller controls first heating loop to work to transmit power energy to heater, and controller simultaneously obtains the working parameter of heating smoking set;Step three: controller judges whether the working parameter of heating smoking set exceeds preset parameter threshold: if yes, then controller switches first heating loop to second heating loop to work to transmit power energy to heater;If no, then continue to repeat the above step two.By controller in power supply starting stage, first, start the first heating loop of higher resistance value, prevent high current damage battery power supply, to improve the protection of battery power supply.

The present application belongs to the technical field of container, and relates to an open-top container. The main structure comprises a box body enclosed by a frame, a front wall plate, a left wall plate, a right wall plate, a bottom plate and a door plate, a pull rod arranged between the left wall plate and the right wall plate, and a reinforcing beam arranged on the bottom plate. The frame and the door plate made of metal can meet the requirements of strength and bearing capacity. The inner surface of the container is smooth, and the corners are rounded. When transporting bulk goods such as coal and sand, the container will not freeze or accumulate compared with the traditional metal container. The outer surface of the container is provided with a structural column with a shape, which increases the strength of the front wall plate, the left wall plate and the right wall plate while increasing the aesthetics. Through auxiliary calculation and simulation test such as finite element analysis, the reliability and safety of the product are guaranteed to the greatest extent. The structure is reasonable, the integral molding process is adopted, the self-weight is reduced, the load capacity and corrosion resistance are improved, and the service life is prolonged.

The application provides a modification method of nitrocellulose membrane and application thereof in preparation of microRNA nucleic acid test strips, and relates to the technical field of nucleic acid lateral chromatographic detection.The application provides a modification method of nitrocellulose membrane, which comprises the following steps: treating the nitrocellulose membrane under plasma conditions; the power of the plasma treatment is 25-80 W; the pressure of the plasma treatment is 35-70 Pa; and the time of the plasma treatment is 70-350 s.The modification method of the nitrocellulose membrane can effectively improve the surface performance of the nitrocellulose (NC) membrane, significantly enhance the surface wettability of the nitrocellulose membrane, make the nitrocellulose membrane have strong hydrophilicity, improve the loading capacity of probes, and enhance the stability of probe fixation, so that the cost is reduced and the sensitivity and specificity of the microRNA nucleic acid test strip are improved.

The invention discloses a variable-rigidity soft prosthetic hand and a using method thereof, and the variable-rigidity soft prosthetic hand comprises a soft simulated hand mechanical body which comprises a rigid-flexible coupling bionic finger group module and a palm module; the rigid-flexible coupling bionic finger set module comprises at least two fingers, and each finger is sequentially provided with a movement cavity and a rigid cavity in the direction from the hand back to the palm. The motion chamber is provided with a corrugated structure and is used for driving fingers to bend; the fiber reinforced layer covers the outer wall surface of the stiffness chamber and is used for adjusting the stiffness of the finger and generating a first direction thrust; one end of the palm module is connected with the rigid-flexible coupling bionic finger group module, and the other end is connected with a limb of a patient; and the pneumatic driving control system is packaged in an inner cavity of the palm module and is connected with an air path in the rigid-flexible coupling bionic finger group module. According to the scheme, the problems that an existing artificial limb is heavy, low in load capacity, high in reset delay and inconvenient to maintain are solved.

The invention relates to the technical field, in particular to a multifunctional straddle carrier based on hydraulic control, which comprises a vehicle body base, walking wheels are arranged at four corners of the vehicle body base, the multifunctional straddle carrier further comprises a support frame, a movable hanging beam and a hydraulic hoisting mechanism, the support frame is n-shaped, and the support frame is fixedly arranged on the top surface of the vehicle body base; the movable hanging beam is movably arranged on the inner side of the supporting frame. The hydraulic hoisting mechanism is arranged on the top of the supporting frame and used for controlling lifting of the movable hoisting beam. The second auxiliary beam bodies can retract into the main beam body and can also extend out of the main beam body towards the two sides, so that the length of the lifting beam can be flexibly adjusted according to the length of a lifted object, the use flexibility of the device is greatly improved, the lifting stability of the object is improved, and the multifunctional lifting effect is achieved.

The present application discloses a kind of heavy die test press machines, including body frame, main oil cylinder, body frame is made of lower crossbeam, column and upper crossbeam.Key features include slider, lifting cylinder, motor, friction stopper and moving platform.Slider includes rotary slider, pressurized slider and side slider, wherein pressurized slider is installed in frame by guide rail, connected with main oil cylinder.Side slider moves up and down through guide assembly and guide rail, and double-side lifting cylinder drives its action.Rotary slider connects two side sliders through rotary shaft, and motor is installed on side slider, rotary motion is realized through driving gear and rotary gear.Moving platform is installed on lower crossbeam, used for installing lower die.Through innovative double-side synchronous drive and gear set driving, the test press machine improves system stability, rotary load capacity and test function, and provides significant technical advantage for large, heavy die test requirements.

The utility model provides a high-stability forklift type AGV. The high-stability forklift type AGV comprises a vehicle body, a door frame, a shear fork type telescopic mechanism, a lifting frame, two pallet fork arms and an adjusting mechanism. The portal frame is movably arranged on the vehicle body, and the shear fork type telescopic mechanism is used for driving the portal frame to move. The lifting frame is arranged on the portal frame in a lifting mode, the two pallet fork arms are movably arranged on the lifting frame, and the adjusting mechanism is installed on the lifting frame and used for adjusting the distance between the two pallet fork arms. According to the forklift type AGV, the scissor type telescopic mechanism is designed to drive the portal and the pallet fork arm to move synchronously, the structural design that a telescopic mechanism is installed on the portal of a conventional forklift type AGV to drive a pallet fork to stretch out and draw back is abandoned, the pallet fork arm cannot stretch out and draw back relative to the portal, in this way, after goods are forked, torque and stress borne by the portal, a lifting frame and the like can be reduced, the forward inclination risk is reduced, and the safety of the forklift type AGV is improved. Therefore, the stability and the safety of forking goods are improved, the mechanical abrasion of the scissor type telescopic mechanism, the lifting mechanism, the portal frame and the like can be reduced, and the service life is prolonged.

The invention discloses a cobalt-based catalyst and a preparation method and application thereof, and belongs to the technical field of catalysts. The method comprises the following steps: (1) adding an HY molecular sieve into a nitric acid solution, and stirring for reaction to obtain a reaction product; (2) performing vacuum filtration on the reaction product to obtain a solid product, and sequentially washing and drying the solid product; (3) calcining the dried solid product to obtain an acid modified HY molecular sieve; (4) adding an accelerant and cobalt salt into distilled water, and stirring to obtain a mixed solution; (5) adding the acid-modified HY molecular sieve into the mixed solution, stirring, heating, and carrying out suction filtration to obtain a precipitate; and (6) sequentially washing and drying the precipitate, and calcining to obtain the cobalt-based catalyst. The cobalt-based catalyst with high dispersion and high anchoring stability is prepared through acid modification of the HY molecular sieve carrier and combination of an accelerant and auxiliary ion exchange, and the cobalt-based catalyst shows relatively stable high catalytic activity on a propane dehydrogenation reaction and has stable high selectivity on propylene at the same time.

The invention relates to the technical field of analog integrated circuits, in particular to a high-precision temperature sensor temperature-sensing front-end circuit based on a chopping technology, and aims to solve the problems of low-frequency 1 / f noise, operational amplifier input offset voltage drift, band-gap reference temperature drift, limited output driving capability and the like existing at the front end of a traditional temperature sensor. The front-end circuit comprises a chopping band-gap reference source circuit, a chopping buffer circuit and a two-phase non-overlapping clock generation circuit, wherein the chopping band-gap reference source circuit adopts a parasitic bipolar PNP transistor with an emitter junction area ratio of 8: 1 as a temperature sensing device, and a high-gain chopping folded cascode operational amplifier is embedded in the chopping band-gap reference source circuit; and stable positive temperature coefficient voltage and low-temperature drift reference voltage are generated. Noise and maladjustment are inhibited from the system architecture level, the temperature measurement precision can reach the sub-degree centigrade level, the loading capacity is high, the method is achieved based on the standard CMOS technology, a special technology and complex temperature calibration are not needed, and the method has the advantages of being low in cost, high in stability and large-scale integration.

The utility model belongs to the technical field of unmanned aerial vehicle loading boxes, and discloses a loading box assembly and a loading unmanned aerial vehicle device. The loading box assembly comprises a box body and a drawing box. The box body comprises a first bottom plate and a plurality of side plates. The first bottom plate and the plurality of side plates form a first loading cavity. The drawing box comprises a second bottom plate, a pulling plate and two partition plates. The pulling plate is connected with the second bottom plate, the two partition plates are rotationally connected to the second bottom plate, the two partition plates can be folded on the second bottom plate and penetrate through the strip-shaped grooves, the two partition plates can be unfolded, and a second loading cavity is formed by the two partition plates, the pulling plate, the second bottom plate and the side plates, so that the loading capacity of the loading box assembly is high; the size of the loading space is adjustable and easy to adjust; the structure is compact. The loading unmanned aerial vehicle device comprises an unmanned aerial vehicle assembly, a clamp assembly and the loading box assembly, the clamp assembly is fixed to the loading platform of the unmanned aerial vehicle assembly, and the clamp assembly is used for fixing the loading box assembly, so that the loading capacity is high, the loading space size is easy to adjust, the structure is simple, and the transportation safety is high.

The utility model relates to a laser cutting device for SMT steel plate machining, which comprises a machining table, a material moving mechanism is arranged on the machining table, two material fixing assemblies are arranged on the material moving mechanism, a machining bin is fixedly installed on the upper right portion of the machining table, a positioning cutting mechanism is arranged on the machining bin, and a laser cutting mechanism is arranged on the positioning cutting mechanism. A hydraulic telescopic device is arranged on the positioning cutting mechanism, a laser cutting tool bit is arranged at the movable end of the hydraulic telescopic device, the material moving mechanism comprises two first bearings, a first servo motor and two guide supporting rods, and the two first bearings and the two guide supporting rods are fixedly installed in the machining table. And a first servo motor is fixedly mounted on the outer wall of the front side of the machining table. According to the laser cutting device for SMT steel plate machining, by arranging the material moving mechanism, the efficiency generated by manual pushing is reduced, and meanwhile the stability and safety of the laser cutting device are greatly improved.

The application relates to the technical field of welding materials, in particular to a high-stability lead-free soldering paste without an inner cover and a preparation method thereof, the lead-free soldering paste contains the following components in parts by weight: 10-14 parts of a soldering paste, 86-90 parts of lead-free soldering powder; the lead-free soldering powder is selected from one or more of Sn99Ag0.3Cu0.7, Sn98.5Ag1Cu0.5 and Sn96.5Ag3Cu0.5; the soldering paste contains the following components in parts by weight: 30-50 parts of rosin, 4-10 parts of resin, 30-50 parts of a solvent, 3-15 parts of an additive, 4-8 parts of a thixotropic agent, 5-10 parts of an organic acid, 0.5-3 parts of a halogen compound and 0.5-2 parts of an antioxidant. In the application, the prepared low-water absorption additive is introduced into the lead-free soldering paste to obtain a high-stability, low-water absorption soldering paste, the soldering paste can be stored for a long time without covering the inner cover, the material for producing the inner cover is saved, the packaging process is simplified, the storage time is prolonged, small and micro enterprises can concentrate on furnace welding, the welding time is reduced, and the energy consumption is reduced.

The utility model discloses a kind of wall cleaning devices suitable for coal powder bin, it is related to coal powder bin cleaning technical field.The utility model includes first support frame, the inside of first support frame is provided with adjusting assembly, adjusting assembly includes first fixed cylinder being installed on first support frame, first motor being installed on the inner wall top of first fixed cylinder, first gear being rotated and cooperated in the inside of first support frame, first sliding block being slidably cooperated in the opposite two sides of the inside of first support frame.The utility model is cooperated by first motor and first gear, and is engaged with first toothed plate, to ensure that the moving distance of two sides first sliding block is consistent, avoid structural deviation or jamming due to uneven stress, first sliding block and first support frame, avoid the shaking range of sliding block, ensure the straightness and stability in moving process, cleaning assembly is convenient for scraping and cleaning to the inner wall of coal powder bin.