100results about How to "Ideal structural design" patented technology

The invention relates to a method for optimally designing the structure of a sliding shaft sleeve based on a Kriging model. By using an unbiased optimal estimation theory of the Kriging model, the optimal design scheme of the sliding shaft sleeve is predicted and solved. The method comprises the following steps of: determining the basic appearance of the sliding shaft sleeve; analyzing and defining a design variable and a definition domain, which influence the shape of the sliding shaft sleeve; sampling a design space by using a Latin hypercube experiment design method; calculating the stress response of the sliding shaft sleeve by using a finite element method; constructing the Kriging model, and performing accuracy estimation; and constructing a mathematical optimization model, solving the optimal design scheme of the sliding shaft sleeve, and validating by using the finite element method. By using the design variable correlation and variability characteristic of the Kriging model, the unbiased optimal estimation is performed, and guidance is provided for optimal design of the structure of the sliding shaft sleeve. Compared with the conventional method, the method provided by the invention has the characteristics of high calculation speed, optimal scheme design and high reliability.

The invention discloses a porous silicon negative electrode material covered by a composite carbon layer and a preparing method thereof. On the basis of porous silicon after dealloying, the first covering of loose carbon and overall covering of exterior high-density carbon are achieved by covering a compounded carbon layer in which graphene and the high-density carbon are combined or low-density carbon and the high-density carbon are combined, interior low-density carbon can improve interior electrical conductivity of a whole micron structure, and the exterior high-density carbon can well prevent an electrolyte from penetrating through the carbon layer and entering the interior of micron particles, accordingly well solve the problem that a silicon material reacts with a battery liquid, ensure a high coulombic efficiency, and accordingly well ensure cycle performance of a battery. According to the porous silicon negative electrode material covered by the composite carbon layer and the preparing method thereof, a core innovation point is double carbon layer covering, and the silicon / carbon / carbon composite negative electrode material is prepared by combining the low-density carbon and the high-density carbon.

[Problem] The purpose of the present invention is to provide a gas separation membrane which dissolves in an organic solvent, exhibits excellent formability, and exhibits excellent gas-separation performance when used as a gas separation membrane. [Solution] A gas separation membrane having a polyimide structure having a repeating unit represented by general formula (1) (In the formula, R1 represents a bivalent organic group, and R2 represents a tetravalent organic group.), wherein R1 is a bivalent organic group represented by general formula (2) or a bivalent organic group represented by general formula (3).

The invention discloses a cigarette filter tip defect online detection device of a cigarette making and plug assembling machine and a method thereof, which belong to the technical field of machine vision. The device comprises an image acquisition module, a control module and a touch display screen, the image acquisition module is in communication connection with the control module through a USB, and the control module is in communication connection with the touch display screen through the Ethernet. According to the method, the image acquisition module is fixed at a photoelectric detection sensor of a filter tip of an original FLO cigarette detector, so that field installation and debugging are facilitated; the image acquisition module is fixed through the adjustable mounting plate, so that the distance of the image acquisition module relative to a detection drum is adjustable, the distance of the detection head relative to the end surface of the cigarette filter is omnidirectionally adjustable, and a good detection effect is ensured; meanwhile, the light source is separated from the two sides of the lens and illuminates the two sides at an inclination angle of 30 degrees, so thatlight supplement of the end surface of a to-be-tested cigarette filter is more uniform, imaging is clearer, and the test precision is improved; and multiple algorithms are adopted to process the imagedata, so that the detection precision is improved.

The invention relates to a structure of an IGBT inverter welding machine with two welding functional modules. The structure comprises an outer housing and an inner circuit board; the circuit board mainly comprises six parts which are separately a drive plate, a control panel, a current detecting plate, an IGBT plate, a fast recovery circuit board and a panel control board; the control panel is connected to the panel control board, a control transformer and the drive plate; the control transformer is used for supplying power to the control panel; the drive plate is connected to the control panel, the IGBT plate and the current detecting plate; and under the action of the control panel, the drive plate generates a drive signal which can reliably drive each IGBT to work, so that stable operation of an inverter circuit is guaranteed. According to the structure, the performance problem, the reliability problem, the production efficiency problem and the manufacturing and transporting cost problem of multifunctional welders are solved very well by adopting a control circuit system consisting of a two-chip micro processor, a single-chip micro processor and the like and optimizing the structural design of a welding machine control circuit, the structural design of a circuit board and the structural design of each part, so that market competitiveness of products is improved.

The invention relates to an optimized design method for a hydraulic cylinder supporting seat of a cover carriage based on a response surface, which is a method for predicting and optimizing an optimized design scheme of the hydraulic cylinder supporting seat based on a difference fitting theory of the response surface; the method comprises the steps of: (1) determining a basic outline and a primary dimension of the hydraulic cylinder supporting seat; (2) analyzing and defining dimension variables, a domain of definition and interactive restraint relation of affecting the shape of the hydraulic cylinder supporting seat; (3) sampling the space by a Latin hypercube test design method; (4) analyzing the stress response of the hydraulic cylinder supporting seat via a finite element method; (5) creating a response surface model and estimating the model precision; and (6) creating an mathematic optimization model, calculating the minimal stress value, and verifying the minimal stress value by the finite element method, and determining the optimized design scheme of the supporting seat. According to the invention, the calculation time is greatly shortened, the calculation cost is reduced, and a high-quality and reliable design scheme of hydraulic cylinder supporting seat of cover carriage can be obtained.

A horizontal barrel plating production line with improved efficiency, comprising a degreasing tank, a barrel plating tank, a first lifting mechanism for transferring the cylinder in the degreasing tank to the barrel plating tank, a cleaning tank, and a second lifting mechanism for transferring the cylinder in the barrel plating tank to the cleaning tank mechanism. The design of this barrel plating production line is ideal, the drag teeth on the degreasing pool are oiled evenly, the electroplating solution in the barrel plating pool is easy to splash on the conductor, and it is also prone to poor contact, and the plating solution in the cleaning pool can be recycled and reused.

The invention belongs to the field of new materials, particularly relates to preparation of an energy storage material, and particularly relates to a three-dimensional cross-linked composite materialFe3O4 / FeS / rGO as well as a preparation method and application thereof. According to the present invention, the technical problem of volume expansion during lithium re-intercalation of an electrode material is solved, deionized water is used as a solvent, the octahedral particles of Fe3O4 / FeS are uniformly dispersed on an rGO sheet layer by utilizing the properties of good conductivity, large specific surface area and more functional groups of reduced graphene oxide, and the Fe3O4 / FeS / rGO composite material is prepared. A conductive network structure provided by rGO provides a larger contact area for an electrolyte and an electrode, and rapid transfer of charges and Li <+> is promoted. Moreover, a larger space gap is formed in the composite material, the three-dimensional cross-linked composite structure is formed, and the volume expansion of the material during lithium intercalation is relieved, and therefore the electrochemical performance of a battery is effectively improved.

The invention discloses a method for high concurrency optimization of a Smart Rack server. The specific method is as follows: S1, the number of application servers are planned according to performance of the application servers and the size of a concurrent access amount; S2, a load balancing technology is used, the fact that a single server processes high concurrency requests is greatly reduced, and reliability of a whole website system while facing a high load is ensured; S3, a structure of a design database is optimized, and an efficient index is established; and S4, management is performed through a caching technology, so a server re-request pressure is relieved, and an access speed is improved. Through Smart Rack server high concurrency optimization, the problem that a system cannot support such a huge amount of accesses and then falls into a time delay and a breakdown which are resulted when a large scale of high concurrencies of a website, such as a taobao when a double-11 activity is carried out and a 12306 ticket-purchasing website, in reality can be solved.

The invention discloses a mining intrinsically safe pan-tilt camera, which comprises a main machine body, a pan-tilt mechanism and a windscreen wiper mechanism; the windscreen wiper mechanism comprises a mounting seat, a brush arm and a rubber doctor blade, the mounting seat is arranged on the outer edge of the lower side of the mainboard shell, the brush arm is hinged to the mounting seat, the rubber doctor blade is arranged on the brush arm, and the outer side of the rubber doctor blade is in an arc shape matched with the side wall of the lens spherical shell; and an elastic component is arranged between the brush arm and the mounting seat, so that the rubber doctor blade is tightly pressed and attached to the side wall of the lens spherical shell, and when the holder mechanism rotates, the rubber doctor blade can scrape coal ash on the surface of the lens. The pan-tilt camera has the advantages that the pan-tilt lens part can be kept clean through the windscreen wiper mechanism, the pan-tilt mechanism and the mainboard shell are designed in a double-bearing mode, the spherical sealing cover in the pan-tilt mechanism is exquisite in structural design, the connection and transmission effects are achieved, meanwhile, the good sealing performance is achieved, and disassembly and maintenance are easy.

A leakage-free special pump comprises a pump body, an eccentric shaft, an inner movable sleeve, an outer movable sleeve, an upper cover inner plate, a lower cover inner plate and a cylindrical capsule, wherein the eccentric shaft, the inner movable sleeve, the outer movable sleeve, the upper cover inner plate, the lower cover inner plate and the cylindrical capsule are disposed in the pump body. The capsule is provided with a plurality of capsule cavities in radial arrangement, the eccentric shaft is bridged between the upper cover inner plate and the lower cover inner plate through a bearing, and the inner movable sleeve and the outer movable sleeve are both sleeved inside and outside the eccentric shaft respectively. The capsule is mounted between the inner wall of the pump body and the outer movable sleeve, and a water inlet pipe opening and a water outlet pipe opening of each capsule cavity are correspondingly communicated with a water inlet valve assembly and a water outlet valve assembly on the pump body. The inner wall of the pump body is provided with an outer dovetail groove, the outer lateral wall of the outer movable sleeve is provided with an inner dovetail groove, and the inner lateral wall and the outer lateral wall of the capsule are provided with an inner dovetail protrusion and an outer dovetail protrusion which are in inserting fit with the inner dovetail groove and the outer dovetail groove respectively. The leakage-free special pump is satisfactory in structural design, water sucked in the capsule is high in quantity by forcedly stretching and extruding the capsule, and integral performance of the pump body is improved.

A multistage sedimentation tank of a centralized treatment system for industrial wastewater comprises a primary sedimentation tank, a secondary sedimentation tank and an aid tank, wherein the aid tankis located between the primary sedimentation tank and the secondary sedimentation tank and communicated with the primary sedimentation tank and the secondary sedimentation tank, an aid partition board is arranged in the aid tank and divides the aid tank into a front aid chamber and a back aid chamber, a channel is reserved between the aid partition board and the aid tank, multiple guide partitionstrips are arranged on two side walls of the front aid chamber in the depth direction of the side walls at intervals, each guide partition strip is obliquely downward, and sludge in the primary sedimentation tank is sent back to a contact oxidation tank. The multistage sedimentation tank is ideal in structural design, the design of multiple guide partition strips is adopted, the stay time of a sedimentation liquid in the front aid chamber is prolonged, the flocculation reaction of the sedimentation liquid with a coagulant added to the front aid chamber is facilitated, and the acting effect ofthe coagulant added later cannot be affected.

The invention provides a transfer film having a stereo matt pattern, and a manufacturing method thereof. The transfer film at least comprises a releasing display layer on which a pattern layer is formed, on the pattern layer, firstly, binders are pressed on a substrate layer through gravure screen printing, then one face of the substrate layer having the pattern layer is combined with the release display layer so as to form the stereo matt pattern; the manufacturing method of the transfer film comprises the following steps: (1) pressing the binders on the substrate layer by using the gravure screen printing to form the pattern layer; (2) combining one face of the substrate layer having the pattern layer with the releasing display layer; (3) forming the pattern layer on the releasing display layer; in this way, the transfer film or the attached objects can have a matt pattern colorful film face, the pattern colorful film face also can form image effects of alternated and layered bright and matt faces in a stereo form, and the matt pattern simultaneously has wear resistance and smooth hand feel, thereby improving texture of products.

The invention discloses an industrial waste gas incineration treatment system. The system comprises a heat storage type thermal incinerator, an acid-alkaline adsorption mechanism, a buffering tank mechanism and an explosion-proof fan; a gas inlet of the acid-alkaline adsorption mechanism is connected with a waste gas source to be treated; a gas inlet of the buffering tank mechanism is connected with a gas outlet of the acid-alkaline adsorption mechanism. According to the system provided by the application, necessary countermeasures are taken against hazard factors in a using process of the heat storage type thermal incinerator, so that the overall treatment process is safe and reliable. The industrial waste gas incineration treatment system has the characteristics that the investment is low; the occupied area is small; the mounting period is short; the requirements on working conditions are low; waste gas can contain a plurality or organic components; the treatment air volume range islarge; the purifying rate is high; full-automatic control is realized; the operation is simple; the operating cost is low. The industrial waste gas incineration treatment system has good structural design and high-quality equipment configuration; the purposes of environment-friendly treatment of VOCs in industrial waste gas, energy conservation and emission reduction, and up-to-standard emission of exhaust are achieved.

The invention discloses a full-automatic moso bamboo cutting-off and conveying production line. The full-automatic moso bamboo cutting-off and conveying production line comprises a moso bamboo cutting-off machine which is used for carrying out cutting-off operation on moso bamboos, a feeding and conveying table which is used for carrying out feeding on the moso bamboo cutting-off machine and a discharging and conveying table which is used for carrying out outputting on the moso bamboos cut off by the moso bamboo cutting-off machine; and the discharging and conveying table further comprises a section surface thickness detection device which is located on one side of a horizontal discharging platform and used for measuring the thickness of the side wall of the end of a moso bamboo tube. Thefull-automatic moso bamboo cutting-off and conveying production line is ideal in structural design, saves time and labor, greatly reduces the labor cost, is automatic in operation, can achieve automatic moso bamboo feeding, automatic moso bamboo cutting off, automatic moso bamboo tube discharging, automatic moso bamboo tube thickness detecting and automatic moso bamboo tube classifying storing, and is high in production efficiency, greatly improves the moso bamboo cutting-off efficiency and quality, and further improvs the moso bamboo cutting-off safety.

The invention discloses a coating, drying and sanding production line for a wood decorative line. The coating, drying and sanding production line for the wood decorative line comprises a first coating machine, a first drying machine, a first sanding machine, a second coating machine, a second drying machine and a second sanding machine; each of the first coating machine and the second coating machine comprises a coating machine head which is used for uniformly coating a coating slurry on the surface of a wood lath, a material supplying and conveying table which is arranged on one side of the coating machine head and a discharge conveying table which is arranged on the other side of the coating machine head; each of the first sanding machine and the second sanding machine comprises a rack and a sanding device which is arranged on the rack and is used for carrying out sanding operation on the wood lath; and each sanding device comprises a first sanding device and a second sanding device through which the wood lath sequentially pass. The coating, drying and sanding production line is ideal in structure design; and by adopting the coating, drying and sanding production line, the wood lath is subjected to twice coating operations, twice drying treatments and twice sanding treatments, sanding operation is sequentially performed on the positive surface and the back surface of the wood lath by the sanding treatments, and the quality of a product is improved.

The invention discloses a miniaturized and light-weight Ka waveband space traveling wave tube. The traveling wave tube comprises a double-anode electron gun (1), a spiral line slow wave circuit (2) connected with the double-anode electron gun (1), and a four-stage step-down collector (3) connected with the spiral line slow wave circuit (2). The device is reasonable in structural design, high-performance miniaturized electron guns are screened out through a large number of experiments, the spiral line slow wave circuit has high linearity and high efficiency, the whole pipe heat dissipation structure is for rapid cooling, and the four-stage depressed collector is excellent in heat exchange performance and low in backflow. The device is advantaged in that experimental detection results show that the total length of the traveling wave tube is smaller than 200 mm, the weight is smaller than 350 g, the power is larger than 55 W, the work ratio is 100%, the phase shift curve is monotonous andsmaller than 45 degrees, third-order intermodulation is larger than 18.5 dBc, and the traveling wave tube has excellent performance, good work stability and a wide application range.

The invention provides an improved welt bifurcated pipe calculation model, and belongs to the field of welt bifurcated pipe calculation models. The method according to the invention is characterized by comprising the steps of establishing a geometric model of the welt bifurcated pipe with one surface of a main plate as the benchmark; selecting a shell unit type, and setting all layer and middle surface results in unit option result storage; selecting the geometric model of the material and setting related physical and mechanical parameters of the material; setting shell unit section parametersof the non-reinforcing area and the reinforcing area respectively; endowing different areas with the shell unit section parameters respectively, and dividing grids to form a grid model; applying a load and a constraint condition to the grid model and calculating stresses of the main board and the stiffening plate; respectively extracting the calculated stresses of the main board and the stiffening plate; and judging whether the calculated stresses of the main board and the stiffening plate are within a specified range, if yes, indicating that the geometric model meets the requirements, and otherwise, respectively adjusting related design parameters of the main board and the stiffening plate until the geometric model meets the requirements.

The invention relates to a heat dissipation device for a display, comprising a backing plate, a bonding layer, a heat dissipation plate, a support component, a reflective sheet, a light guide plate, adiffusion sheet, a display unit, a lateral entrance type LED light source, an LED light circuit board and an LED light bar bonding layer, wherein the backing plate, the bonding layer, the heat dissipation plate, the support component, the reflective sheet, the light guide plate, the diffusion sheet and the display unit are sequentially arranged and are parallel to each other, the lateral entrancetype LED light source, the LED light circuit board and the LED light bar bonding layer are arranged on the side surface of the heat dissipation device and are sequentially arranged, and the lateral entrance type LED light source is arranged at the innermost side. The heat dissipation device for the display has the advantages that the heat dissipation plate uses a high-thermal-conductivity composite for replacing an existing material and is supplemented by good structural design and other heat conduction and heat dissipation materials, thus the obtained heat dissipation device for the displayis ultrathin in structure and superior in performance.

The invention discloses a universal joint for pipelines. The joint disclosed by the invention comprises a joint bolt (1), nonmetallic seal snapping sleeves (a and b), lock nuts (A and B) and a supporting tube (4), wherein the joint bolt (1) is a hollow bolt, the two ends of the joint bolt are different in outside diameter and are provided with external threads, the portion before a coarse threaded end is of a smooth stainless-steel tube section, an arc-shaped groove is formed in the end part of the coarse threaded end, and a conical groove is formed in the end part of a fine threaded end; the seal snapping sleeves (a and b) are made of nylon materials. The universal joint disclosed by the invention is applicable to the connection between any two pipelines of different outside diameter sizes.

The invention discloses a machine tool integrating the functions of ice breaking, snow removing and ground sweeping. The machine tool integrating the functions of ice breaking, snow removing and ground sweeping comprises a rotary shaft, a rotating frame, a flat-shaped flexible connecting part, a crutch-shaped ice breaking knife and a planar flat-shaped elastic sweeper, wherein the cross section of the rotary shaft is in an arbitrary shape, the rotating frame is fixedly installed on the rotary shaft in a mode of surrounding the rotary shaft, the flat-shaped flexible connecting part is in a plane shape due to the fact that the flat-shaped flexible connecting part is restrained by the self-elastic stress when not bearing external force, and the planar flat-shaped elastic sweeper is composed of elastic brush wire sets. According to the machine tool integrating the functions of ice breaking, snow removing and ground sweeping, the structural design is more scientific, reasonable and excellent, the functions of ice breaking and effective removing of ice, ripe snow or hard snow on the ground in the snowfall season are achieved, and the functions of floor sweeping and efficient sweeping of non-ice-and-snow abandoned waste on the ground in the non-snowfall season are further achieved; and the machine tool is especially suitable for sweeping the various smooth grounds covered by the ice, the ripe snow or the hard snow in the snowfall season, and more suitable for being configured on large, medium and small traveling ice and snow removing machines.

The invention discloses a slicer for door frame board quick forming. The slicer for door frame board quick forming comprises a rack, a working platform, a transverse cutting tool, a lengthways cuttingtool and a push device, wherein the transverse cutting tool is used for transversely cutting the side part of a short material, the lengthways cutting tool is installed on the working platform and used for lengthways cutting the same side part of the short material, and the push device is installed on the rack and used for pushing the short material to move forwards on the working platform. The slicer for door frame board quick forming is ideal and compact in structural design, can achieve the very good quality benefit and economic benefit while the pollution caused by glue to the environmentis reduced; it is adopted that the short material is transversely cut by the transverse cutting tool and is lengthways cut by the lengthways cutting tool in sequence in the length direction of the short material, and then a door frame short material with the integrated large border and small border can be formed by removing excess materials; according to the running form cutting mode, operation is carried out in one step, the traditional mode of keeping to the edge, and the traditional mode of splicing a large border and a small border are changed, it is guaranteed that the internal stress ofthe door frame short material formed by the large border and the small border keeps consistent, a door frame board made through finger joint later is consistent in internal stress, and it is guaranteed that the forward lateral bending of a product is not out of limits, so that the straightness is guaranteed.

The invention discloses a self-walking type cable snow remover, which comprises a cylindrical case, two pairs of walking units, a driving shaft and a cutter, wherein the case is equally divided into a first case body and a second case body, the first end of the first case body is rotatably connected with the first end of the second case body, and the second end of the first case body is connected with the second end of the second case body through a lock catch; the two pairs of walking units are installed on the first box body and the second box body respectively, each walking unit comprises two walking assemblies, and the four walking assemblies are located in the case and distributed in a central symmetry mode; the driving shaft is coaxially arranged with the rotating joint of the two first ends, the driving end of the driving shaft is inserted into the case in the axial direction, and the driven end of the driving shaft is located on the outer side of the case; and the cutter is arranged at one end of the case and is in transmission connection with the driving shaft through a first transmission assembly. The self-walking type cable snow remover has the advantages that the stability is higher, the snow removing efficiency is higher, and the cable is not prone to being damaged.

The invention provides a passive coal ash content measurement device. The passive coal ash content measurement device comprises a lead shielding cover arranged above coal to be measured; an antenna is arranged under the coal to be measured; the antenna is connected with a photoelectric converter by a low-noise detector; the photoelectric converter is connected with a signal processor by an amplifier; and the signal processor is connected with a terminal by a data transmission device. A measurement method comprises the measurement steps: the low-noise detector receives natural gamma rays sent by a radioactive source in the coal to be measured; a natural gamma ray signal received by the low-noise detector is transmitted to the photoelectric converter to be subjected to A / D conversion; the converted signal enters the amplifier to be subjected to energy grade analysis; the signal subjected to the energy grade analysis by the amplifier enters the data processor to be processed in a specific processing manner; and a result processed by the signal processor is sent to the terminal by the data transmission device to be displayed. The passive coal ash content measurement device has the characteristics of on-line safety and rapid measurement.

In order to solve the technical problem that an existing A-column upper sidebeam reinforcement structure is large in weight, the invention provides a reinforcing tube and a manufacturing method of the reinforcing tube. The reinforcing tube is a carbon fiber composite tube and comprises a first section, a second section, a third section, a fourth section, a fifth section and a sixth section which are sequentially connected, wherein the thickness of the second section, the thickness of the fourth section and the thickness of the sixth section are equal, and the thickness of the first section, the thickness of the third section and the thickness of the fifth section are all larger than the thickness of the second section. The reinforcing tube is used for connecting a vehicle side wall outer plate and a vehicle side wall inner plate. The reinforcing tube is manufactured through a variable-thickness three-dimensional braiding process, and by fully utilizing the designability of a three-dimensional braided carbon fiber winding technology, the performance is guaranteed, meanwhile, extreme light weight is achieved, and the optimal structural design is achieved. The material thickness of the tubular beam is changed through design at different positions, the material thickness is increased at the main force bearing and connecting positions, and the material thickness is reduced at the secondary force bearing positions, so that the lighter weight is achieved under the same performance as that of a metal reinforcing piece.

The invention provides a toothbrush disinfection device. The device comprises a closed box formed by assembling a front shell, a rear shell and a transparent cover, wherein a controller is electrically connected with an ultraviolet ray disinfecting lamp, an air blowing device, a storage battery and a power switch. A water collection tank is arranged below the transparent cover; a closed disinfection space is formed among the water collection tank, the front shell and the transparent cover; a temperature and humidity sensor is arranged inside the disinfection space and connected with the controller; an air inlet is formed in the front shell; and the air blowing device blows air into the disinfection space via the air inlet. According to the device disclosed by the invention, a disinfectionenvironment in the toothbrush disinfection device is kept clean, the safety and mouth health of a user are ensured, the structural design of the toothbrush disinfection device is reasonable, the energy is saved, the cost is reduced, and the user operation is convenient and reliable.

The invention relates to a fry pan for preventing hand scalding. The fry pan comprises a pan body, a fry pan handle fixedly connected to the pan body and a pan cover covering the pan body and furthercomprises a protection cover for preventing hand scalding, and the protection cover is fixedly arranged on the top face of the fry pan handle. The fry pan is ideal in structural design, by adopting the design of the protection cover, in the cooking process, juice, such as seasoning juice and hot oil, in the pan body is effectively prevented from splashing and scalding the hands, and the hand safety of operators is protected.

The invention relates to a three-phase power supply type IGBT single-tube invertion hand-arc welding machine. The welding machine is a manual welding device utilizing a three-phase power supply, an IGBT single-tube full-bridge inversion control technology is adopted, wherein control circuits comprise an under-voltage, over-voltage and overheating protection control part, a switch power supply circuit, a power-on buffer control circuit and a digital display and control circuit part controlled by a microprocessor, four circuit boards are designed, in addition to a switch power supply control circuit board, a display and control circuit board of the output current, a direct current bus voltage identification control circuit board and some large components or parts, the rest of the components or parts are arranged on the other circuit board in a welding mode, wherein three control boards are placed in an insulation box, the insulation material is poured, and therefore good dust-proof, water-proof, mildew-proof and vibration-proof protection functions can be achieved. The welding machine has the advantages of being low in cost, high in reliability and the like.

A production line for preparing bamboo powder by moso bamboo raw material comprises a cutting machine for cutting moso bamboos into bamboo splints, a smasher smashing the bamboo splints into bamboo powder and a bamboo powder collection room for collecting bamboo powder. The production line has an ideal structure; each processing link is smartly arranged and compactly arranged; and the production line has high production efficiency and can effectively reduce bamboo powder dust pollution.