52results about How to "Easy to bring out" patented technology

The invention relates to a bearing press-fitting device, in particular to an automatic bearing press-fitting machine for motor rotors. The invention aims at providing the automatic bearing press-fitting machine which is capable of pressing and fitting rotors at the two ends at one time, is simple to operate, safe and reliable, high in press-fitting efficiency and good in press-fitting quality. The automatic bearing press-fitting machine comprises a base, press-fitting cylinders, a left bearing supply mechanism, a right bearing supply mechanism, a left bearing locating mechanism, a right bearing locating mechanism and a rotor locating mechanism; the left and the right bearing supply mechanisms supply bearings to the left and the right bearing locating mechanisms; the bearings are located by the left and the right bearing locating mechanisms; the left bearing locating mechanism and the rotor locating mechanism are pushed by a piston rod of the press-fitting cylinders to slide to the position of the right bearing locating mechanism to press and fit the bearings at the two ends at one time. In addition, the cylinders in the whole device are all provided with magnetic switches. A PLC (programmable logic controller) can automatically control the operation of the whole device by the signals from the magnetic switches to the PLC so as to press and fit the bearings at the two ends automatically.

The invention relates to a partial pressure sintering method for sintering a neodymium-iron-boron magnet. Certain inert gases Ar are filled into various deflation sections in the sintering process, the pressure of the Ar gases inside a furnace is regulated according to blank deflation velocity and vacuum pump system exhaust velocity through vacuum degree control, so that heating sintering is carried out by uniformly deflating under different partial pressures of the Ar gases, and negative pressure is still kept. The partial pressure sintering method disclosed by the invention ensures the consistency and uniformity of magnetic property and saves the sintering time.

The invention provides a fluidized bed low-temperature destructive distillation system and a low-temperature destructive distillation method of low-rank coal. According to the method, a mixed gas of hot coal gas produced by a gasification furnace and circulation cold coal gas is adopted as a hot carrier and a fluidizing gas of a destructive distillation reaction. A hydrogen atmosphere of coal gas can provide a partial hydrogenation effect, such that obtained tar has the advantages of high light component content, good quality, high thermal efficiency, and high yield. Also, with the method, a two-stage low-temperature destructive distillation reactor is adopted, such that the retention time of solid particles in the reactor is increased, destructive distillation effect is improved, high solid content in the bed can be maintained, and operation stability can be maintained. The invention also provides a low-temperature destructive distillation reactor. The low-temperature destructive distillation reactor is the two-stage low-temperature destructive distillation reactor, such that the retention time of solid particles in the reactor is increased, and destructive distillation effect is improved. With the two-stage low-temperature destructive distillation reactor, high solid content in the bed can be maintained, and operation stability can be maintained.

The invention provides a module flow balancing water channel used for a direct current converter valve. The water channel comprises a water inlet pipe, a water outlet pipe, saturable reactors, thyristor radiators, damping resistors and a water distribution connecting pipeline. A water channel circuit is composed of a thyristor radiator and damping resistor branch circuit and saturable reactor branch circuits, wherein the thyristor radiator and damping resistor branch circuit and the saturable reactor branch circuits are arranged in a mode with parallel connection and series connection mixed. The water inlet pipe and the water outlet pipe are arranged in parallel, a diagonal water inlet and outlet method is adopted, the thyristor radiators and the damping resistors are connected in series to form a branch circuit which is connected between the water inlet pipe and the water outlet pipe in parallel, and the saturable reactor branch circuits are arranged between the head end of the water inlet pipe and the tail end of the water outlet pipe and between the tail end of the water inlet pipe and the head end of the water outlet pipe respectively. Compared with the prior art, the module flow balancing water channel used for the direct current converter valve has the advantages that flow distribution is even, temperature distribution of thyristors is even, no flow dead zone exists in the water channel, and partial discharge caused by deposition of air and impurities is avoided.

The invention relates to a section milling type casing pipe sidetracking windowing tool, and belongs to the technical field of petroleum and gas well casing sidetracking windowing tools. The section milling type casing pipe sidetracking windowing tool is composed of an upper connector, a tool body, a flow guide cone, a flow guide cone seat, a flow guide rod, a piston assembly and the like, and is characterized in that the upper connector is arranged at the upper end of the tool body, the flow guide cone seat is arranged on the upper portion of a cavity of the tool body, and the flow guide rod and the flow guide cone are in clamped connection; a small spring is arranged at the connecting position of the flow guide cone and the flow guide rod, and the piston assembly is arranged at the position, on the lower portion of the flow guide cone seat, in the cavity of the tool body, and is composed of an upper piston body, a throttle pipe, a lower piston body, a spring, a limiting pressing plate, a supporting sleeve and a supporting nut; a knife rest is arranged on the lower portion of the tool body, and provided with knives through pin shafts; the lower piston body is provided with the supporting sleeve through the supporting nut, and the limiting pressing plate is arranged below the lower piston body. The stretching amount of the knives can be adjusted and controlled, and the knives can be automatically opened or contracted, and are solid and durable. Operation is convenient, the sidetracking windowing effect is good, and milling efficiency is high.

The invention relates to the technical field of aluminum and aluminum alloy purifying and refining treatment, in particular to a refining agent for metal smelting, a preparation method and a refiningtechnology. The refining agent for metal smelting aims to remove impurities of molten aluminum in the aluminum alloy refining process, so that the product quality is improved, and atmospheric pollution is avoided. The refining agent for metal smelting comprises, by weight, 30-40 parts of potassium chloride, 15-30 parts of sodium chloride, 10-20 parts of sodium tetrachloroaluminate, 8-20 parts of sodium sulfate, 15-30 parts of chloride sodium silicate and 2-5 parts of activating agent. According to the refining agent for metal smelting, the activating agent is added to the refining agent, the activating agent can promote sodium tetrachloroaluminate in the refining agent to decompose and reduce the interfacial tension between the refining agent and oxide inclusion at the same time, so that the oxide inclusion can smoothly float on the surface of the melt and then is removed, and therefore the product quality is improved.

The invention discloses a borehole cleaning system and a cleaning method. The borehole cleaning system comprises a drilling machine, wherein a drilling rod is arranged at the upper part of the drilling machine; a rotary spray head is mounted at the head of the drilling rod; a water pipe is arranged on the drilling rod, and is communicated with the rotary spray head; a straight nozzle and an inclined nozzle are formed in the end part of the rotary spray head; and a recording device and a driving device are arranged on the drilling rod of the drilling machine. The borehole cleaning system has the advantages that the reaching distance is long, and the location is available; the effect of cleaning a borehole of a complicated structural system can be realized; the gas treatment effect can be improved greatly; and the economical efficiency and rationality of extraction quantities can be achieved. Through the synergistic effect of the straight nozzle and the inclined nozzle, when the borehole is cleaned, residues can be taken out of the borehole more easily, the barrier cleaning ability is good, the cutting efficiency is high, and plugged and collapsed holes can be dredged and cleaned more easily. The improvement is made on the rotary spray head, an additionally adopted through hole structure and a sealing surface formed by a rotating shaft and a central spindle forms a passage, and the passage and the sealing surface are filled with water serving as a gap, so that the friction to the sealing surface is reduced, and the service life of the sealing surface is increased.

The invention discloses a reverse circulation trencher which comprises a moving mechanism and a trenching mechanism, wherein the moving mechanism comprises a bottom plate, a fixing plate, supporting rods, a T-shaped rod, a mounting plate, a storage battery, a moving wheel and a supporting plate II. The fixing plate is vertically arranged in the middle position of the top of the bottom plate, the supporting rods are obliquely arranged at two ends of the top of one side of the fixing plate, the other ends of the supporting rods are welded to the top of the bottom plate, and the T-shaped rod is horizontally arranged in the middle position between the two supporting rods. The reverse circulation trencher changes a trenching operation mode of an existing trencher, reduces the contact area of ascraper assembly and soil and reduces resistance, that is the front end of an excavating part inclines. Only the front end scraper assembly of the excavating part is in contact with soil when the reverse circulation trencher is driven by driving rotation, and meanwhile, as soil is consistent with the excavating part in shape, when the reverse circulation trencher is driven by driving rotation, asthe bottom of soil is hollowed, soil located on the top of the excavating part is easily taken away by the scraper assembly.

The invention relates to the field of medical apparatuses and instruments, in particular to a threaded pipe angle regulating device and supporting system for operation with anesthesia. The device comprises a support assembly and a head fixing support; the support assembly comprises a base, a clamping base and a support component, the support component and the clamping base are both arranged on thebase, the support component and the base are in rolling connection for regulating the installing angle of a threaded pipe, and the clamping base and a rolling base are rotationally connected for regulating the installing angle of an anesthesia machine; the head fixing support comprises a rolling frame body, a supporting device and a clamping device, the supporting device is used for regulating the proper head supporting position, and the clamping device is used for head positioning. The device is simple in structure and convenient to operate, can avoid the phenomenon that ventilation obstruction or threaded pipe disengagement is caused due to the fact that the threaded pipe from being driven or pressed towards one side or bent in the anesthesia process and the head of a patient can swingin the anesthesia process, and is suitable for prone-position operation.

The invention discloses a multi-wire grinding device which is characterized in that an inverted triangle bracket fixed to the front side surface of a bed, a grinding mechanism for grinding a to-be-ground workpiece, a supporting unit located below the grinding mechanism and used for supporting and moving the to-be-ground workpiece, and a cooling mechanism fixed to the front side surface of the bed are arranged on the front side of the bed; the grinding mechanism is provided with a pay-off wheel, a take-up wheel, a left guide wheel, a right guide wheel and a contact wheel; the pay-off wheel and the take-up wheel are connected with the front side surface of the bed, are located on the two sides of the bottom corners of the inverted triangle bracket respectively and are used for winding a diamond wire; the left guide wheel, the right guide wheel and the contact wheel are arranged on the inverted triangle bracket and used for arranging the diamond wire between the pay-off wheel and the take-up wheel into a diamond wire row through supporting; the supporting unit is provided with a vertical moving mechanism and a horizontal moving mechanism; the vertical moving mechanism is arranged on a coolant recovery tank of the cooling mechanism and used for driving the to-be-ground workpiece to move vertically; and the horizontal moving mechanism is arranged on the vertical moving mechanism and used for driving the to-be-ground workpiece to move horizontally. A situation that the precision is affected due to blocking of cutting chips is prevented effectively, the cutting heat is reduced, and the probability of heat injury to the surface of the workpiece is reduced.

The invention discloses a degradable heat sealing film for compounding and a preparation method thereof. The degradable heat sealing film comprises a heat sealing layer, a middle layer and an outer layer, which are connected in sequence. The middle layer comprises the following components in parts by weight: 35 to 45 parts of PBAT, 35 to 45 parts of PLA, and 15 to 25 parts of a biodegradable nucleating agent; the heat sealing layer comprises the following components in parts by weight: 80 to 90 parts of PBAT and 10 to 20 parts of a biodegradable nucleating agent; and the outer layer comprisesthe following components in parts by weight: 80-90 parts of PBAT and 10-20 parts of a biodegradable nucleating agent. The degradable heat sealing film has the advantages that the crystallization rateof an extruded material is high, the melt strength is high, the film is not easy to break under traction, the film is easy to form, the heat sealing property is good, the printing effect is good, thehardness is moderate, certain softness and certain stiffness can be considered, and the degradable heat sealing film can be compounded with a printed film to be used as a heat-sealing layer and can beindependently made into bags.

The invention discloses a feed production cleaning device and an application method thereof. The device comprises a U-shaped fixed frame, a cleaning bin is hinged between the side walls of the openingend of the fixed frame, a rotating shaft is installed in the center of the inner wall of the bottom side of the cleaning bin, multiple sets of stirring plates are arranged on the outer wall of the rotating shaft, and a supporting rod is arranged on the side face of the bottom end of the fixed frame. The multiple sets of stirring plates are arranged on the outer wall of the rotating shaft at equalintervals in the vertical direction, each set of stirring plates comprises three stirring plates, and the three stirring plates in each set are annularly arranged on the outer wall of the rotating shaft at equal intervals. A buffer cavity is formed in the inner wall of the bottom side of the cleaning bin, a sealing plug made of rubber is connected in a through hole in an inserted manner, a through pipe of a Y-shaped structure is connected to the inner wall of the bottom side of the buffer cavity in a through manner, and the end, away from the buffer cavity, of the through pipe is connected with an air pump and a water pump in a branched manner. Through the cooperative use of the above devices, the raw material cleaning speed can be increased, conveyed materials can be cleaned more thoroughly, the raw materials can be dried, and the feed production efficiency is improved.

The invention discloses a double-heat-source defrosting oil gas recovery set capable of preventing a refrigerant from migration. The set comprises a primary compressor refrigeration system, a secondary compressor refrigeration system, a three-level condensation bi-channel oil gas system and a double-heat-source defrosting system. Refrigerant high-temperature hot gas is combined with high temperature inlet oil gas effectively, exhausted high-temperature refrigerant gas is input to a pipe for heating defrosting when the set runs for defrosting, the high temperature hot oil gas carries out defrosting outside the pipe, defrosting is carried out in the two manners, defrosting time can be shortened greatly, and defrosting is more thorough .

The invention discloses a comprehensive extraction method of origanum vulgare, which comprises the following steps: taking fresh origanum vulgare, screening to obtain a raw material, cutting off the raw material, performing washing, drying and dehydrating, and collecting distillate; adding inorganic salt into the distillate, and then sequentially carrying out ultrafiltration membrane filtration, nanofiltration membrane filtration and reverse osmosis concentration to obtain a concentrated solution and a permeate solution, the concentrated solution being origanum oil, and the permeate solution being origanum refined dew; crushing and sieving the dried and dehydrated origanum vulgare to obtain origanum vulgare powder; carrying out continuous countercurrent extraction on the origanum vulgare powder to obtain an origanum vulgare extracting solution; adding an antioxidant into the origanum vulgare extracting solution, uniformly stirring, standing, and centrifugally separating to obtain a supernatant and a centrifugal precipitate; washing and drying the centrifugal precipitate to obtain ursolic acid; and filtering the supernatant, purifying the supernatant with chromatographic resin, andperforming decolorizing, recrystallizing, and drying to obtain rosmarinic acid. The extraction method provided by the invention is high in raw material utilization rate, simple and convenient to separate, low in equipment performance requirement and easy for large-scale production.

The invention discloses a mud-water balance jacking pipe system and a construction method thereof. The mud-water balance jacking pipe system comprises a mud sedimentation tank, wherein a sedimentation tank is arranged on the left side of the interior of the mud sedimentation tank; an adjusting tank is arranged on the right side of the interior of the mud sedimentation tank; a mud-water separator is arranged above the sedimentation tank; a stirrer is arranged in the adjusting tank; the lower end of the right side of the adjusting tank is connected with a water feeding pump; the water feeding pump is connected with a second water feeding pipe through a first water feeding pipe; the second water feeding pipe is connected with a mud and water cabin of a jacking pipe tunneling machine. The mud-water balance jacking pipe system has the beneficial effects that mud and water are recycled, the water consumption is reduced, the cost is reduced, the environment pollution is avoided, mud residues are easily brought out, mud is not easily precipitated in a mud discharging pipe, the circumstance that anti-sticking soil expands when meeting water, and a soil wall is easily collapsed and damaged is avoided, the effects of discharging the mud residues and balancing underground water are achieved, the stability of a tunneling surface is good, meanwhile, the mud residues are conveniently separated, treated and transported, the friction resistance between a pipe joint and a soil body in a jacking process of a jacking pipe can be reduced, and the construction difficulty is low.

The invention relates to a rotator cuff repairing surgery device, a hollow limiting drilling bit, and an operation method. The rotator cuff repairing surgery device includes an aiming arm, a suture device, a sleeve, an aiming rod and a locking fastener. The hollow limiting drilling bit includes a drilling rod having an axial drilling hole. In operation, a PDS suture is reserved on the aiming arm, the suture device and the aiming rod are used to perform positioning, the hollow limiting drilling bit drills a bone tunnel, a PDS suture passes through the suture device, and then the reserved PDS suture is used to drive the PDS suture in the bone tunnel out from a through groove of the aiming arm, the PDS suture drives a suture for suturing a rotator cuff out, cross-bone tunnel transversal mouth-shaped tying is performed, and then the rotator cuff repairing surgery operation is completed. The rotator cuff repairing surgery device and the hollow limiting drilling bit are simple in structure, the sutures can be easily taken out, and the operation method is completed under arthroscopy monitoring; the surgery difficulty, the learning cost and the material cost is reduced, patient and social insurance economic burdens can be reduced, and the rotator cuff repairing surgery can be promoted to the greatest extent.

The invention relates to the field of medical apparatus and instruments, in particular to a head supporting device and a threaded pipe angle adjusting system for an anaesthesia operation. The head supporting device and the threaded pipe angle adjusting system comprise an angle adjusting support and a fixed support; the angle adjusting support comprises a base, a clamping base and a support assembly, the support assembly and the clamping base are both arranged on the base, the support assembly is in rolling connection with the base for adjusting the mounting angle of a threaded pipe, and the clamping base is rotatably connected with the rolling base for adjusting the mounting angle of an anaesthesia machine; the fixed support comprises a rolling rack body, a supporting device and a clampingdevice, the supporting device is used for adjusting an appropriate head supporting position, and the clamping device is used for head positioning. The head supporting device is simple in structure and convenient to operate, the threaded pipe can be prevented from being taken out or compressed toward one side or broken off in an anaesthesia process, the phenomenon is avoided that the head of a patient swings in the anaesthesia process so that disturbance of ventilation can be caused or the threaded pipe can fall off, and the head supporting device and the threaded pipe angle adjusting system are suitable for a prone position surgery.

A forming device for dental floss section film stripping comprises a frame and is characterized in that the front end part and the rear end part of the frame are respectively provided with a section film stripping mechanism and a forming die, the section film stripping mechanism is formed by a base and a film stripping blade, the upper end face of the base is evenly distributed with longitudinal film stripping tool grooves, the film stripping blade is of an arrow shape and is composed of a tool head and a tool handle, the film stripping blade is fixed in the film stripping tool grooves evenly distributed on the upper end face of the base by the lower end part of the tool handle of the film stripping blade, the section film stripping mechanism is fixed on the front end part of the frame by the lower bottom face of the base, the forming die is evenly distributed with V-shaped concave grooves in transverse arrangement, the internal wall of one side wall of the V-shaped concave grooves extends out a skirt towards the upper end part, the lower bottom of the forming die is fixed at the rear end part of the frame, and the V-shaped concave grooves evenly distributed in transverse arrangement on the forming die are respectively opposite to the film stripping blade on the base of the section film stripping mechanism. The invention can be applied in the manufacture process of dental floss.

The invention provides a fluidized bed low-temperature destructive distillation system and a low-temperature destructive distillation method of low-rank coal. According to the method, a mixed gas of hot coal gas produced by a gasification furnace and circulation cold coal gas is adopted as a hot carrier and a fluidizing gas of a destructive distillation reaction. A hydrogen atmosphere of coal gas can provide a partial hydrogenation effect, such that obtained tar has the advantages of high light component content, good quality, high thermal efficiency, and high yield. Also, with the method, a two-stage low-temperature destructive distillation reactor is adopted, such that the retention time of solid particles in the reactor is increased, destructive distillation effect is improved, high solid content in the bed can be maintained, and operation stability can be maintained. The invention also provides a low-temperature destructive distillation reactor. The low-temperature destructive distillation reactor is the two-stage low-temperature destructive distillation reactor, such that the retention time of solid particles in the reactor is increased, and destructive distillation effect is improved. With the two-stage low-temperature destructive distillation reactor, high solid content in the bed can be maintained, and operation stability can be maintained.

The invention relates to the technical field of purification and refining treatment of aluminum and alloys thereof, in particular to an environment-friendly refining agent, a preparation method and arefining process and aims to remove impurities in molten aluminum in the aluminum alloy refining process so as to improve the product quality and avoid atmospheric pollution. The environment-friendlyrefining agent is prepared from components in parts by weight as follows: 30-40 parts of potassium chloride, 15-30 parts of sodium chloride, 10-20 parts of sodium tetrachloroaluminate, 8-20 parts of sodium sulfate, 15-30 parts of sodium silicate chloride and 1-3 parts of a catalyst. An accelerant is added to the refining agent, the accelerant can promote decomposition of sodium tetrachloroaluminate in the refining agent, besides, interfacial tension between the refining agent and oxide inclusions is reduced, so that the oxide inclusions can smoothly float on the liquid level to be further removed, and the product quality is improved.

The invention relates to the field of medical instruments, in particular to a device for adjusting the installing angle of a threaded pipe of an anaesthesia machine through a rolling support. The device comprises a support assembly, a base and a clamping seat. The clamping seat is fixedly arranged at the upper end of the base and used for installing and positioning of the anaesthesia machine, thesupport assembly can rotate relative to the base to be used for adjusting the installing position and angle of the threaded pipe, the anaesthesia machine is installed on the clamping seat, and the threaded pipe is fixed to the support assembly. During use, through rotation of the support assembly relative to the base and the change of the height of the support assembly, the threaded pipe connectedbetween the support assembly and the anaesthesia machine does not warp and is kept in a natural stretching and shrinking state, and therefore it can be avoided that in the anaesthesia process, the threaded pipe warps or stretches excessively, so that the mechanical ventilation obstacle of a patient or disengagement of a catheter is caused.

The invention provides a locking mechanism in order to solve the problems that an existing locking manner may damage matched threads between threaded structures, and consequently the matched threads are possibly locked permanently, and unlocking is hard. The locking mechanism comprises a set screw and a structural gasket made from plastic or copper or aluminum. The set screw comprises a nut, a first screw rod, a polished rod and a second screw rod which are connected in sequence. The first screw rod is matched with a threaded hole in a structural body to be locked. The structural gasket is overall cylindrical an, and the lower end of the structural gasket is sealed. A threaded hole groove and a cylindrical inner cavity capable of containing the second screw rod. An internal thread of the threaded hole groove is matched with an external thread of the second screw rod. During unlocking, along with screwing out of the set screw, the structural gasket is gradually matched with the thread of the second screw rod of the set screw, so that the structural gasket is easily taken out by the set screw, taking off and replacing of the structural gasket are benefited, and it is avoided that dueto repeated locking and unlocking of the structural gasket, gasket scraps fall off, and unlocking fails.

The invention discloses a fuel battery air diversion plate in the normal pressure or lower pressure condition, which is characterized by the following: the air diversion plate is square diversion bipolar board of integral bifarious combination of air diversion board and cooling water board, which contains air inlet main stream hole, air outlet main stream hole, hydrogen inlet main stream hole, hydrogen outlet main stream hole, cooling water inlet main stream hole, cooling water outlet main stream hole with diagonal distribution for each inlet and outlet hole, wherein several air diversion grooves are set between air diversion inlet and outlet main stream grooves; several cooling water diversion grooves are set between cooling water board inlet and outlet main stream holes. The invention is not easy to block diversion groove, which operates stably.

The invention discloses a label removal device for a double-end bottle washing machine. The label removal device comprises a soaking tank and a label removal box which are communicated with each other; one side of the label removal box is communicated with a label outlet pipe; two closed roller chains are arranged in the label removal box in a rotating mode; the two roller chains are driven by rotation of a driving chain wheel and a driven chain wheel which are arranged in the label removal box to rotate; a filter chain net is laid on the two closed roller chains; the filter chain net comprises an upper climbing section which is communicated with an outlet end of the soaking tank and the label outlet pipe; a rotating label removal brush is arranged below the top end side of the upper climbing section of the filter chain net; a lye circulation pipeline with a high-flow axial flow pump is communicated between the bottom end of the label removal box and the bottom end of the soaking tank to form the rapid water flow; a lye flushing pump is communicated in an inner chamber of the filter chain net; the lye flushing pump is connected with a bottle-washing flushing pipeline which is connected with a bottle-out flushing opening and a bottle-in flushing opening. According to the label removal device for the double-end bottle washing machine, the structural design is simple and practical, the manufacturing and maintenance cost is low, the label removal capability is high, and the requirements of a recovery bottle production line with the output which is more than 5000 pieces every hour can be met.

The invention provides ecological environment quality evaluation equipment, which comprises: a main body and a sampling shaft, wherein the top end of the main body is connected with a handle to conveniently control and operate the main body, and the bottom end of the main body is connected with the sampling shaft to be inserted into soil to sample deep soil; and an extrusion block, wherein the extrusion block is a semi-arc-shaped plate connected to one side of the sampling shaft in a penetrating and embedding manner and extending in an inclined manner. Through an extrusion block arranged on the device, when soil with a large amount of moisture in the soil is sampled, the soil can be movably clamped by applying force, so that the soil can be taken out more easily; and moisture in the soil can be extruded and discharged to a certain degree, so that the moisture can be kept in a certain shape to be better collected when being taken out.

The invention relates to the field of medical equipment, in particular to a head support system for an operation with anesthesia. The head support system comprises an angle adjusting bracket and a fixing bracket, wherein the angle adjusting bracket comprises a base, a clamp seat and a bracket assembly, the bracket assembly and the clamp seat are arranged on the base, the bracket assembly is in rolling connection with the base and used for adjusting the mounting angle of a screw tube, and the clamp seat is in rotational connection with the base and used for adjusting the mounting angle of an anesthesia machine; the fixing bracket comprises a rolling bracket body, a support device and a clamp device, the support device is used for adjusting the head support position to be proper, the clamp device is used for head positioning. The head support system is simple in structure and convenient to operate, the screw tube can be prevented from being brought out or being compressed and folded to one side in an anesthesia process, the condition of ventilation disturbance or falling off of the screw tube due to the fact that the head of a patient probably swings in the anesthesia process can beavoided, and the head support system is suitable for a prone position operation.

The invention belongs to the technical field of a fuel cell, and relates to a fuel cell flow guiding polar plate and a fuel cell stack and system. Two oxidant inlets and two oxidant flowing channels are formed in the flow guiding polar plate; the two oxidant flowing channels are connected with the two oxidant inlets respectively for conveying oxidant to each oxidant flowing channel through the twooxidant inlets; the fuel cell stack adopts the abovementioned flow guiding polar plate; and a fuel cell power generation system also comprises two independent oxidant supply systems, and comprises two independent compressors, and adjusts the fluid flows and pressure in the two paths of the oxidant flowing channels. Compared with the prior art, by virtue of the flow guiding polar plate provided bythe invention, fluids in the flowing channels and a ventilating layer can be conveyed and drained more smoothly with higher efficiency, without causing a phenomenon of water blocking.

The water supply and drainage pipeline for the high-rise building comprises an outer pipe and an inner pipe arranged in the outer pipe, guide strips are arranged on the inner wall of the inner pipe, and a concave area is formed between every two adjacent guide strips which are spirally distributed; the guiding strips and the adjacent sunken areas jointly guide water flow to flow downwards in the spiral direction on the inner wall of the inner pipe, and the buffering device is arranged between the inner wall of the outer pipe and the outer wall of the inner pipe and used for buffering impact of the water flow in the inner pipe. According to the water supply and drainage pipeline for the high-rise building, the pipeline is designed to be of an inner and outer double-layer structure, a buffer structure is designed between the double-layer structure, and a corresponding cleaning mechanism is arranged in the inner wall of the inner-layer structure, so that the inner wall of the pipeline can be cleaned by filling water or air; and meanwhile, an original concave area can become a new spiral guide structure through a corresponding expansion mode of a corresponding cleaning structure, and meanwhile, the surface can be cleaned.

The invention provides an injection molding machine nozzle cleaning device which is used for cleaning an injection molding machine nozzle. The injection molding machine nozzle cleaning device comprises a bottom plate, a movable plate, position-limiting rods, a cleaning mechanism and first elastic pieces, wherein the movable plate is arranged on the side, close to the nozzle, of the bottom plate, the first elastic pieces are arranged between the bottom plate and the movable plate and are always in a compressed state, one ends of the position-limiting rods are fixedly connected with the bottom plate, the other ends of the position-limiting rods penetrate through through holes in the movable plate, the movable plate is made to slide along the position-limiting rods and be always kept parallel to the bottom plate, the cleaning mechanism comprises a hollow base, a telescopic piece connected with the base in a sleeving mode and a second elastic piece which is arranged between the base and the telescopic piece and is always in a compressed state, the telescopic piece comprises a fixing piece, a position-limiting piece and a heating piece, the fixing piece is fixedly connected with the second elastic piece, the position-limiting piece is rotatably connected with the fixing piece, the heating piece is fixedly connected with the end, away from the fixing piece, of the position-limiting piece, screw threads are arranged on the outer surface of the heating piece, and a position-limiting hole is formed in the base.