74results about How to "No impact damage" patented technology

The invention belongs to the technical field of surface corrosion prevention and discloses a water-based high-corrosion-resistance coating with excellent stamping performance and a preparing method and application of the water-based high-corrosion-resistance coating. The coating comprises, by mass, 25-60 parts of water-based resin, 2-8 parts of water-based cross-linking agent, 0.1-0.5 part of catalyst, 4-10 parts of cosolvent, 0.1-1 part of flatting agent, 0.1-10 parts of lubricating agent, 2-10 parts of water-based toughening resin, 0.1-0.5 part of defoaming agent, 0.5-3 parts of thickening agent and the balance water, and the total mass parts of the components are 100 parts. According to the water-based high-corrosion-resistance coating, the water-base resin serves as film forming matter, so that good construction performance is achieved, curing is quick, super corrosion resistance can be obtained when the thickness of the coating is 2-5 micrometers, the performance of resisting neutral salt mist is longer than 2,000 hours, resistance to acid salt mist is longer than 500 h, the corrosion grade can reach 9.8 or higher, and the salt mist resisting performance of the coating is maintained unchanged after stamping or bending is carried out.

The invention relates to a low-voltage draw-out switch gear, in particular to a propulsion mechanism for a drawer of a low-voltage draw-out switch cabinet, including a precession mechanism and a three-position locking mechanism, wherein, the precession mechanism includes a transmission spiral which is arranged on a bottom board of the drawer by a support and a groove-shaped locating piece which is inosculated with the transmission spiral and pushes the drawer to move forward and backward and is arranged on a layer board of a cabinet body; the positioning with the linear movement of the drawer is carried out by a spiral protrusion of the transmission spiral and a chute of the groove-shaped locating piece, so as to ensure the drawer not to be skewed and generate a mechanical movement dead point when the drawer receives the reverse withdrawal force. The invention adopts the multi-ring effort-saving propulsion principle of the transmission spiral to ensure the effort-saving propulsion of the drawer, creatively utilizes the spiral protrusion of the transmission spiral and the chute of the groove-shaped locating piece to effectively control the balanced movement of the drawer and fully controls the drawer to be balanced absolutely and not be skewed when the drawer receives the reverse withdrawal force, the operation is flexible and easy, and the operating mechanical faults can be eliminated.

The invention relates to a method for overturning a box beam. A round overturning jig frame is designed, the box beam can be arranged in the overturning jig frame, and the performance that the overturning jig frame can roll is fully utilized, so that the box beam can be overturned and rolled, and can reach any angle, and further the welding and the drilling are convenient. The invention also limits a structure of the round overturning jig frame specifically. By utilizing the technical scheme in the invention, the impact damage can not be generated for hoisting mechanical equipment, in construction operation, the operation is simple and fast, the use is reliable and light, and the safety guarantee is reliable, and the cost is low. In addition, since the overturning is convenient, the optimal position of the welding at the ship-shaped welding can be guaranteed, the internal quality of welded seams can meet the requirements, the appearance quality of members can not generate distortion and deformation, and the internal quality also can not be damaged. On another aspect, the drilling also needs to keep the drilling surface upward all the time, which can be easily achieved by utilizing the overturning jig frame.

The invention discloses a hydraulic push-return impact oscillator, comprising an upper connector, a barrel and a lower connector connected in a threaded manner sequentially from top to bottom. A diversion assembly, a reciprocating drive assembly and a backpressure valve assembly are nested in the barrel. The diversion assembly comprises a guide sleeve, an upper valve block, a valve block, a lower valve block and a distribution plate. The reciprocating drive assembly comprises a drive piston and a reversing valve. The backpressure valve assembly comprises a backpressure valve head, a backpressure valve block and a discharge sleeve. Pumped high-pressure liquid is in the oscillator and diverted by the diversion assembly to provide hydraulic drive horsepower for the reciprocating drive assembly, the reversing valve controls the drive piston to finish an upper stroke and a lower stroke, the drive piston also drives the backpressure valve head to reciprocate, the backpressure valve head periodically opens or closes the backpressure valve block so as to enable a pulse backpressure-relief process in a string, the drive piston will impact on the upper valve block or the lower valve block at the end of each stroke, and therefore, periodical mechanical impact is generated.

The invention discloses a fixing device for a stage sound. The fixing device comprises a base, a support platform and a rotary platform, wherein a cylinder seat is arranged on the base, a cylinder isembedded into the cylinder seat, the support platform is fixedly arranged on an output shaft at the tail end of the cylinder, the rotary platform is arranged on the support platform, the lower centerof the rotary platform is connected with one end of a rotating shaft, the other end of the rotating shaft penetrates through the support platform, a motor is arranged at the bottom of the rotating shaft, telescopic rods are arranged at the upper four edges of the rotary platform, a control box is arranged on the base, and a human body infrared sensor, an indicator lamp module, a storage module anda controller are arranged in the control box; and the human body infrared sensor, the indicator lamp module and the storage module are all electrically connected with the controller. Compared with the prior art, the fixing device can be controlled according to operation requirements during use, is quick in operation, time-saving, steady in overall structure and stable in operation, does not produce any impact damage, and at the same time, is simple in structure manufacture, convenient in manual processing and assembly and low in production cost.

The invention provides a piston part fatigue test high detonation pressure simulating device. The piston part fatigue test high detonation pressure simulating device comprises a test machine seat, a piston supporting seat, an adjusting cylinder sleeve, a test cylinder body, a load amplifier and a low-pressure cavity body, a low-pressure input cavity A is formed between an inner hole of the low-pressure cavity body and the top surface of a low-pressure touching head, a high detonation pressure action cavity B is formed by the bottom surface of a high-pressure touching head, the top surface of atest piston and the adjusting cylinder sleeve, an inertia force action cavity C is formed by the test machine seat, the adjusting cylinder sleeve and the bottom of the test piston, and the low-pressure input cavity A, the high detonation pressure action cavity B and the inertia force action cavity C are separately connected with an electro hydraulic servo system through own oil ducts. According to the piston part fatigue test high detonation pressure simulating device, a test method of three-channel inputting three-oil cavity control is adopted, and oil mass supplement, load infliction and pressure monitoring are separately carried out on three pressure cavities through a three-channel of the electro hydraulic servo system. The working purposes of low-pressure output of the equipment, high load infliction of the test piece head and asynchronous bearing of the bottom and skirt section of the test piece are realized.

The invention discloses a block stone disintegration method based on CO2 liquid-gas phase change, belonging to the technical field of rock disintegration technology. According to the method, to-be-disintegrated block stone is subjected to measurement or ocular estimation so as to determine the basic shape and size of the block stone; hole arrangement can be adjusted according to practical situations, and the basic principle of hole arrangement is that one drill hole is arranged in each area with a size of eight cubic meters of the block stone; the drill holes are arranged to have vertical or slightly-oblique surfaces and arranged in the wider edges of the block stone as much as possible, and the depth of the holes is no more than two meters in principle; the step of filling of carbon dioxide can be carried out in any stage of previous three steps of the method as needed; high-pressure liquid carbon dioxide is injected into a pipe body via a filling machine; and during filling, it should be ensured that slag in the pipe body is removed at first and liquid carbon dioxide is used for cleaning and evacuating air in the pipe body. The method is reasonable in structural design; a few facilities are used and are convenient to carry and simple to operate, and a single person can finish all the operation; the method does not employ an explosive or mechanical way; good safety effect is obtained; the method does not produce flying stone, vibration and impact destroy and is low in cost; the facilities are repeatedly usable; high efficiency is realized; and operation flexibility is good.

The invention provides a ternary automatic transmission for a motor vehicle and relates to a fully-mechanical automatic transmission. The ternary automatic transmission for the motor vehicle comprises a first shaft (1), an intermediate gear shaft (9) and a second shaft (2), wherein the first shaft (1) is in clutch connection with an output shaft of a motor; forward-gear driven gears (3) on the second shaft (2) cooperate with one another to form relative motion and relative rest of gears by adopting a ternary mechanical clutch mode of an overrunning clutch (4), a spiral clutch (5), a centrifugal clutch (6) and the like so as to realize fully-mechanical automatic transmission of the motor vehicle. The ternary automatic transmission for the motor vehicle has the advantages of simple and compact structure, adaptation to the installation position and size of the conventional manual transmission, and positive effects of sliding in gear, saving fuel oil, reducing emission, improving riding comfort, prolonging the service life of each of the motor and a transmission system and the like due to reasonable construction and is convenient for manufacture and installation.

The invention provides an alternating current (AC) ice melting system for a traction network of an electrified railway. The AC ice melting system is provided with a step-down transformer and capacitive electrical equipment; the current flowing through the traction network is adjusted by adjusting output voltage of the step-down transformer and impedance of the capacitive electrical equipment, and ice coating is molten by virtue of Joule heat generated in the event that the current flows through a lead; and a complete set of device has the advantages of small electrical capacity and high energy utilization ratio. The AC ice melting system comprises the step-down transformer (10), the capacitive electrical equipment (20), a circuit breaker and an isolating switch, wherein, the high-voltage side of the step-down transformer (10) is connected to a bus (27.5kV) of a traction substation through the isolating switch and the circuit breaker; and the capacitive electrical equipment (20), a contact network (2) and a bonding conductor (4) are connected with other conductors (3) of the traction network to form an ice melting circuit through the circuit breaker and the isolating switch at the low-voltage side of the step-down transformer (10).

The invention relates to a thermal insulation water sealing slot used for a dry coke furnace and the preparation method thereof. The water sealing slot comprises a bottom plate, an air through hole arranged at the center of the bottom plate, and a saillant outer skirt edge and an inner skirt edge which are arranged on the periphery of the through hole. The invention is characterized in that the thermal insulation water sealing slot is formed by welding and fixing the components of the bottom plate, the outer skirt edge and the inner skirt edge, and a fire-resistant and thermal insulating material layer is arranged on the inner side of the inner skirt edge. The preparation method adopts a welding method, and the fire-resistant and thermal insulating material layer is formed by casting. The thickness of the wall is one-third of the original, and the stress bearing capability is four times of the original and can bear the damage of the expansion and contraction stress brought about by quick cold and quick hot, the annealing process is required before the operation, the stress bore by each welding opening cannot enlarge rapidly because of the overall deformation, the crack cannot be caused, and 50000 times of coke discharging can be ensured under normal operation condition. Meanwhile, the water sealing slot has simple preparation method, is time saving and labor-saving, has low production cost and is energy saving and environmental protective. The invention can be widely applied in the thermal insulation water sealing slot of the dry coke furnaces with various specifications.

The invention discloses a high-strength hollow thermal-insulating building material. The specific preparation process is as follows: 1) preparing hydrolyzed plastic microsphere; 2) preparing molding slurry; 3) filling the molding slurry into the hydrolyzed plastic microsphere; 4) drying the filled plastic microsphere in a drying chamber at 80-85 DEG C; 5) preparing a coating solution; 6) uniformlycoating a layer of coating solution on the surfaces of the filled plastic microsphere; 7) baking the dried coated microspheres, thereby acquiring high-strength porous hollow microsphere. A netted hollow structure is formed in the material prepared according to the invention; an inner support structure of the porous hollow microspheres is mainly prepared from silicon dioxide and aluminum oxide, sothat the heat-conducting property is low; due to a duct structure in the microsphere, when the heat is conducted by a plurality of ducts after passing by the porous hollow microsphere, the heat is gradually reduced and is low when the heat is finally transferred to a wall surface, so that the heat insulation effect is achieved in winter and summer.

The invention discloses a straw crusher which comprises a charging device, a discharge device, a crushing device and a feeding device, wherein the crushing device comprises a rotor spindle, rotor cutterheads, a plurality of groups of fly cutters, cutter pins and a filter screen; the rotor cutterheads are arranged and fixed on the rotor spindle at equal gaps; the fly cutters are connected with the rotor cutterheads by the cutter pins; gaps are formed between the fly cutters and the filter screen; a discharge port is formed below the filter screen and connected with the discharge device; the feeding device is in an L-shaped structure formed by an upper press roll and a lower press roll and forms a feeding channel; one end, with a larger opening, of the feeding channel faces towards a charging port and is connected with the charging device; the other end of the feeding channel is connected with the crushing device; the lower press roll is formed by arranging feeding rolls in parallel, and is connected with a charging conveying belt; the upper press roller at least consists of a feeding roll, and is mounted on an upper press roller cover; and a hinge is arranged at a charging port end of the press roll cover. The straw crusher has the advantages of simple structure, high crushing efficiency, stability, smaller product particle size and the like.

A double-gear driving type automatic unloading lifting and handling device comprises a bracket assembly, a transport bucket mechanism assembly and a ground transfer vehicle assembly; the transport bucket mechanism assembly is installed on guide slots and racks of the bracket assembly through rollers and gear racks, and the ground transfer vehicle assembly is arranged on transport rails of the bracket assembly; and the bracket assembly is installed on a fixed dam body, a base, a mounting base or other fixtures in a bolted connection mode. The synchronous belt driving type lifting and handling device is stable and reliable in the transport process, and is high in up-and-down handling speed and efficiency; the lifting and handling device does not shake right and left in the lifting process, and is easy to control; and no impact damage to buildings and the like is caused, and the lifting and handling device is low in manufacturing cost, small in size and occupied space, and suitable for long-time promotion and application.

The invention discloses a multifunctional stage sound box convenient for moving and lifting, which comprises a loudspeaker, a sound box body, LED colorful lamps, a rotating platform, a bearing base and a bottom plate, wherein the sound box body is provided with the loudspeaker; a plurality of LED colorful lamps are arranged on the outer surface of the sound box body; the bottom end of the sound box body is supported and connected through the rotating platform; a buffer pad is arranged between the sound box body and the rotating platform; the rotating platform is fixedly connected with a telescopic structure through a screw bolt and nut; a turbine is mounted on the telescopic structure and the turbine downward penetrates the bottom plate and is provided with a limiting block so that a plunger rod and a cylinder structure are more compact; the back surface of the sound box body is embedded with LED colorful lamps and an operation switch so that the appearance of the sound box is beautiful and elegant; a protective cover is covered above the sound box device, thereby avoiding the dust from falling onto the sound box device to further affect the auditory effect; the anti-interference capability of the sound box can be improved; meanwhile, the dust can be prevented from entering the sound box, thereby improving the sound effect of the sound box on the stage.

The invention discloses a brittle material acid pickling frame. The brittle material acid pickling frame comprises a front support and a rear support which are both rectangular; four fixing rods are arranged between the front support and the rear support; the two ends of the fixing rods are slidably connected to the front support and the rear support correspondingly; the sliding paths of the ends, connected to the front support, of the fixing rods are located on the connecting lines from the center to the four top corners of the front support correspondingly; the sliding paths of the ends, connected to the rear support, of the fixing rods are located on the connecting lines from the center to the four top corners of the rear support correspondingly; the middle of each fixing rod is provided with at least one annular clamping groove; and the brittle material acid pickling frame further comprises locking devices used for locking the ends of the fixing rods. The periphery of a part is uniformly fixed through the fixing rods of the acid pickling frame, and the part cannot slide out in any direction or shake and can be more stably clamped; the part can be horizontally placed in a cleaning pool when being cleaned, is suspended in the air and is prevented from being bumped and damaged; and the cleaning time of all portions of the part is consistent, cleaning is uniform, and the cleaning effect is good.

The invention discloses an electrical control cabinet used for an industrial robot. Telescopic rods are arranged at the bottom of the electrical control cabinet, so that height of the electrical control cabinet can be adjusted conveniently; a lightning arresting apparatus is arranged in the center on a ceiling, so that a lightning protection measure is set for the electrical control cabinet; multiple heat dissipation holes are formed in the bottom plate of the electrical control cabinet body, so that primary heat dissipation of the electrical control cabinet is performed; a dust prevention netis arranged on the outer wall of the bottom plate, so that dust prevention is performed on equipment in the electrical control cabinet; when a temperature sensor or a humidity sensor detects that thetemperature or the humidity in the electrical control cabinet reaches a certain numerical value, a micro processor indicates a driving motor to start a fan to perform secondary heat dissipation or dehumidification; in addition, when a dust sensor detects that the dust in the electrical control cabinet reaches a certain value, the microprocessor indicates a red indicating lamp on a cabinet door tobe turned on so as to remind a working staff to clean dust on the equipment in the electrical control cabinet in time; by virtue of the scheme, any impact damage is not caused; and meanwhile, the electrical control cabinet is simple in structural manufacturing, convenient to process and assemble manually, and convenient to use by people.

The invention discloses a head CT angiography examination headrest. The headrest mainly comprises a headrest main body, a headrest groove is formed in the headrest main body, the examination headrestfurther comprises a micro air pump and a lifting headrest, a clamping adjustment deflation valve, a clamping adjustment inflation valve, a lifting adjustment deflation valve and a lifting adjustment inflation valve are arranged on the headrest main body, a gas outlet end of the micro air pump is connected to one end of a main gas pipe, the other end of the main gas pipe is connected to a main gasinlet pipe, a lifting air bag gas pipe and a right air bag gas pipe are connected to the main gas inlet pipe in series, the tail end of the main gas inlet pipe is connected with a left air bag, the tail end of the lifting air bag gas pipe is connected with a lifting air bag, and the tail end of the right air bag gas pipe is connected with a right air bag. The height of the headrest can be adjustedin a lifting mode, comfort and accurate examination of patients with different body types are met, and the headrest is simple in structure and convenient to machine, manufacture and use by medical staff.

The invention discloses an inductor arranging device which comprises a rotating platform. A feeding region, a screening region and a grabbing region are sequentially arranged in the rotating direction of the rotating platform. A screening assembly is arranged inside the screening region, the screening assembly comprises a screening plate, stacked materials are prevented from passing due to cooperation of the screening plate and the rotating platform, a material supply assembly is arranged inside a discharging region, materials are fed into the rotating platform through the material supply assembly, and a material detection camera, a front face material gripper and a back face material gripper are arranged inside the grabbing region; the front face material gripper and the back face material gripper each comprise a three-axis mechanical hand and a suction cup arranged at the end of the three-axis mechanical hand, wherein a rotating assembly is further arranged between the three-axis mechanical hand and the suction cup, and the rotating assembly drives the suction cup to rotate; a discharging collecting mechanism is arranged at one side of the grabbing region, and materials are transshipped into the discharging collecting mechanism after the front face material gripper and the back face material gripper grab the materials. The device can perform damage-free screening, and is high in material yield and high in speed.

The invention discloses a combined biomass breaking machine which comprises a charging device, a discharging device, a breaking device and a feeding device, wherein the breaking device comprises a rotor main shaft, rotor cutter disks, fly cutters, cutter pins and a filter net; the rotor cutter disks are arranged and fixed on the rotor main shaft at an equal interval; the multiple groups of fly cutters are connected with the rotor cutter disks through the cutter pins; gaps are formed between the flying cutters and the filter net; a discharging hole is formed below the filter net and connected with the discharging device; the feeding device comprises an upper pressure roller and a lower pressure roller which form a feeding channel adopting an L-shaped structure; one end of the feeding channel, provided with a larger opening, faces to a feeding hole and is connected with the charging device, and the other end of the feeding channel is connected with the breaking device; the lower pressure roller comprises feeding rollers arranged in parallel and is connected with a charging conveying belt; the upper pressure roller at least comprises a feeding roller and is mounted on an upper pressure roller cover; a hinge is arranged at the feeding hole end of the pressure roller cover. The combined biomass breaking machine has the advantages of simple structure, suitability for breaking various biomass fuels, high breaking efficiency, stability, smaller product particle size and the like.

The invention discloses a schoolbag with a clamping groove realizing convenient card swiping and external force protection. The structure of the schoolbag comprises the easy-swiping protection clamping groove, a bag body, a lifting handle, a zipper gap, straps, buckle strips, covering cloth, a zipper puller and extension strips, wherein the easy-swiping protection clamping groove is embedded in the bag body and clearance fit is adopted, the lifting handle is mounted at the top end of the bag body, the top end of the covering cloth is mounted inside the bag body, the easy-swiping protection clamping groove comprises a pressure air pushing transfer device, a soft interlayer, a clamping groove body, a magnetic induction block, impact buffer claws, a movable pull block, a sliding chute shell and an impact groove, the left end of the movable pull block is connected with the top end of the pressure air pushing transfer device, when a student carrying the schoolbag needs to carry out card swiping, only the position where a card is placed needs to align at a card machine, through the magnetism of the card machine, the magnetic induction block is pushed downwards, the card is wrapped again,when the student plays by carrying the schoolbag, when the clamping groove body is impacted, the impacting force squeezes main control blocks, and thus the injures caused to the card due to impactingcan be avoided.

An SCR catalyst blockage removal device, which utilizes the shock wave principle of pulse injection to perform strong blockage removal on the SCR catalyst through "explosive" jet air flow, and is characterized in that: the compressed gas stored in the air cannon (1) instantaneously removes the blockage of the SCR catalyst. It is released to form an "explosive" high-pressure air mass, which is transported into the SCR reactor through the injection pipe (2) and the "duck-bill" nozzle (3), and the SCR catalyst and the protective layer (4) are deposited and blocked. Horizontal spray to clear blockage. According to the catalyst of different specifications, the blocking removal device can be evenly arranged around each layer of catalyst, and can be automatically opened and closed according to the resistance change of the catalyst layer to realize the blocking function, so as to ensure the performance of the catalyst, prolong the service life of the catalyst, and reduce the energy consumption of the equipment. The technical solution has significant advantages such as strong blocking ability, no damage to the catalyst, no influence on the normal operation and maintenance of the SCR, low cost, and convenient installation and maintenance.

The invention relates to the field of recreation facilities, in particular to a combined recreational vehicle seat connecting device and a use method thereof. The combined recreational vehicle seat connecting device comprises a framework fixed at the back end of a front seat and a locking mechanism fixed at the front end of a back seat, wherein the framework is of a square frame structure consisting of a first side frame, a second side frame, a third side frame and a fourth side frame; a pull rod is glidingly inserted and connected onto the second side frame and the fourth side frame; one endof the pull rod can be connected with the locking mechanism, so that the back seat is connected onto the tail part of the front seat; an adjustable thrust mechanism is arranged on the pull rod; a polygon rod is glidingly inserted and connected onto the first side frame and the third side frame; a buffer mechanism is arranged on the polygon rod; the polygon rod is connected with the thrust mechanism; a tail section protection mechanism is arranged on the framework; the polygon rod is connected with the tail section protection mechanism. The combined recreational vehicle seat connecting device and the use method thereof have the advantages that the inertia impact of the front and back seats can be reduced; passengers are protected from impact injury; the buffer effect between the front and back seats can be regulated according to people with different bearing abilities.

The invention discloses an electrical fire monitoring detector. The detector comprises a detection body, a bottom base, a mounting rod and mounting bolts. The back surface of the detection body and the bottom base are integrally mounted; a mounting sleeve is arranged outside the bottom base; the mounting rod is integrally mounted outside the mounting sleeve; the top end of the mounting rod is connected with the bottom of a fixing plate, a winding shaft is connected to the middle of the top end of the fixing plate through a bearing, the top end of the winding shaft is coaxially connected with the bottom of a rotating handle, a middle shaft is connected to the middle of the mounting rod through a bearing, and the outer portion of the middle shaft is connected with the inner wall of a windingroller through a torsional spring. According to the electrical fire monitoring detector, when the fastening bolts are used for installation, the installation is not limited by the external environment, the installation work of the whole detector is very convenient, the whole detector is always in a protection state when placed and not installed, and the phenomenon that the detector is impacted and damaged by the outside is avoided.

The invention discloses a submersible sewage pump coupling and lifting device. The submersible sewage pump coupling and lifting device comprises a coupling seat, a coupling frame, a limiting seat, a guider and a submersible sewage pump, two positioning blocks are symmetrically arranged on the two sides of an inlet flange of the coupling seat, two positioning grooves are symmetrically formed in thetwo sides of a flange of the coupling frame, and two C-shaped guide grooves are symmetrically formed in the two sides of the upper portion of the flange of the coupling frame; the coupling frame is connected with an outlet flange of the submersible sewage pump through a bolt and is positioned through two taper pins which are symmetrically arranged on the two sides of the flange; and the couplingseat and the coupling frame are positioned and connected through a positioning inclined plane (1) of the positioning block and a positioning inclined plane (2) of the positioning groove and a flange inclined plane (1) of the coupling seat and a flange inclined plane (2) of the coupling frame, so that the coupling of the submersible sewage pump and the outlet pipeline is realized; the limiting seatis arranged below an inlet of the submersible sewage pump and is used for limiting the transverse displacement of the submersible sewage pump; and the guider is used for guiding steel wire ropes forhoisting and distributing acting force of the left steel wire rope and the right steel wire rope. The coupling and lifting device is applied to coupling and lifting of the large submersible sewage pump with the opening diameter 300 mm or above, coupling and lifting are convenient, sealing is reliable, maintenance is easy and convenient, the service life is long, and the maintenance cost is low.

An ultrahigh-pressure long-service-life throttling valve for testing a high-pressure pump in petroleum drilling comprises a valve body assembly and a valve element assembly, and the valve element assembly is arranged in the valve body assembly in a sliding mode. A plurality of valve seats are fixedly arranged in the valve body assembly in an up-and-down overlapping mode, a plurality of valve elements are fixedly arranged in the valve element assembly in an up-and-down overlapping mode, and the valve seats are matched with the valve elements to form gap throttling conical rings and backflow cavities which are arranged in a multi-stage series connection mode. When ultrahigh-pressure fluid flows through the ultrahigh-pressure throttling valve, the pressure borne by each stage of gap throttling cone ring and the backflow cavity is greatly reduced through throttling of the gap throttling cone rings and the backflow cavity which are connected in series in multiple stages, and the erosion problem of the throttling valve is greatly solved; due to the design of supporting and guiding of the two ends of the valve element assembly, the anti-vibration performance of the throttling valve is greatly improved; the design of the minimum safe throttling gap is adopted between the valve element and the valve seat, even if the valve element is broken, the minimum throttling gap is still kept between the valve element and the valve seat, a throttling channel cannot be blocked, and therefore impact damage to a high-pressure pump and testing equipment cannot be generated.

The invention relates to the technical field of agricultural production equipment, in particular to a gibberellin spraying device for improving the corn yield, a rack is provided with a sliding control mechanism for controlling a vertical spraying rod, the bottom of the rack is provided with a moving mechanism, and the rack can move forwards in a gap between the left and right sides of corn through the moving mechanism; in the advancing process, gibberellin can be sprayed to the left side and the right side of the corn through the vertical spraying rod, meanwhile, when the rack travels into the front-back gap of the corn, the position of the vertical spraying rod can be changed through the sliding control mechanism, and the vertical spraying rod can spray gibberellin to the front side and the rear side of the corn; the vertical spraying rod can comprehensively spray the corn in a convex tooth line mode under the mutual cooperation of the moving mechanism and the sliding control mechanism, so that the corn is evenly sprayed, the yield of the corn is improved, corn leaves cannot be damaged in the forward or transverse moving process, and the integrity of the corn is guaranteed.

The invention relates to a boiler maintaining platform which is lifted by a lifting rope. The boiler maintaining platform comprises a guide rod and a seat type maintaining table which are formed by assembling, wherein the seat type maintaining table comprises a seat type maintaining chair and a safety seat cushion; the seat type maintaining chair comprises a chair back, a chair surface and a footsupporting surface from top to bottom; the seat surface and the foot supporting surface are horizontally arranged; the rear part of the foot supporting surface is fixed with the front part of the chair surface through a perpendicular connecting rod; the guide rod is horizontally arranged, and comprises a first guide rod arranged on the rear part of the chair back, a second guide rod arranged on the bottom of the chair surface, and a third guide rod which is arranged on the bottom of a connecting rod or the foot supporting surface; and each guide rod is in sliding connection to the seat type maintaining table through a guide tube. The boiler maintaining platform disclosed by the invention is simple in structure, is quick in establishing, is small in integral weight, enables maintaining staff to sit down to maintain, is mechanically controlled to move up and down as well as left and right, can be suitable for inner and outer irregular spaces of a boiler, and is safe and reliable.

The invention discloses a multifunctional submersible mixed transportation vortex pump. The vortex pump comprises a suction inlet, a guide impeller, a vortex impeller, a pump shaft and a discharge head, wherein the suction inlet is connected with the guide impeller, the vortex impeller and the discharge head in sequence into a whole; the pump shaft penetrates through the centers of the suction inlet, the guide impeller, the vortex impeller and the discharge head. The vortex pump has the characteristics of high corrosion resistance, freeness from collision components, low required power, high treatment viscosity, high efficiency, prevention of emulsification effect on well fluid, multiple functions, high suitability, realization of mixed transportation of gas and liquid, fundamental elimination of blockage, cavitation, excessive wear, running reliability, high efficiency, low maintenance, long service life and the like, and is widely applied to petroleum suction and conveying processes; the treatment viscosity of viscous media is up to 300,000Pa.c, the required power is low and is not up to a half that of a pump of the same specification, blockage is prevented, the conveying percent of solid particles is up to 75 percent, high and low-viscosity well fluid of which the gas content is up to 68 percent can be conveyed, and all the phenomena influencing the pump performance such as blockage, cavitation, excessive wear, damage and the like are avoided fundamentally.