45results about How to "Obvious advantages" patented technology

A process for manufacturing compact coils of ultra-fine grained martensite-free steel bars, the process comprising the following phases: a) rolling a billet by means of a roughing mill (1) of the steel bar; b) performing at least one first cooling stage (2) so that the steel bar has a surface temperature higher than the martensite start temperature (Ms) and at least one first equalization stage in air; c) rolling the steel bar by means of at least one intermediate mill (3); d) performing at least one second cooling stage (4) always keeping the surface temperature higher than the martensite start temperature (Ms) and at least one second equalization stage in air; e) rolling the steel bar by means of a finishing mill (5) in the non-recrystallization temperature range, keeping the entire cross section of the steel bar in said non-recrystallization temperature range and wherein the total reduction is between 25% and 50% with respect to the cross section of the steel bar at the inlet of the finishing mill, so as to obtain an ultra-fine grained austenitic matrix; f) winding the steel bar into compact coils by means of at least one winding device (7) so that the ultra-fine grained austenitic matrix transforms into a mixture of ferrite and pearlite. After the winding operation is completed, the compact coils can be conveyed to a storage area by means of a conveying device (8), for example a walking beam, in which the coils are subjected to natural cooling or forced cooling or delayed cooling.

The invention belongs to the technical field of metal separation, and particularly relates to a deep eutectic solvent, a preparation method and application thereof, and a method for selectively extracting lithium from a lithium battery positive electrode material. According to the deep eutectic solvent provided by the invention, nearly 100% selective leaching of lithium is realized in an extremely short time, and Ni, Co and Mn are almost not leached, so that the bottleneck that the rate and the selectivity are difficult to obtain at the same time in a traditional method is broken through; and the process conditions are mild and efficient, are far superior to the traditional process and are more suitable for practical industrial application, and the energy consumption and material consumption are remarkably reduced.

The utility model discloses a high-rigidity half-moon groove tool rest unit of a combined lathe and the combined lathe, belongs to the technical field of numerical control combined lathes, and solves the problems that a traditional linear guide rail feeding structure is large in occupied space, poor in rigidity and unstable in machining quality. The tool rest unit comprises a tool rest body, and a guide groove is formed in the circumferential face of the tool rest body and axially penetrates through the tool rest body. A sliding groove plate matched with the guide groove is arranged in the guide groove. The sliding groove plate is shorter than the guide groove and used for bearing a cutter. And the section of the guide groove is half-moon-shaped. Limiting plates are installed on the portions, on the two sides of a groove opening of the guide groove, of the tool rest body respectively, and the limiting plates are pressed on the sliding groove plates so as to limit movement of the sliding groove plates in the radial direction. Due to the fact that the sliding groove and the sliding groove plate are arranged on the peripheral face of the tool rest body, occupied space is reduced, and rigidity and transmission efficiency of the whole structure are improved. The tool rest unit is matched with a narrow space scene of a multi-spindle lathe, and the machining requirements of high precision and high efficiency are met.

The utility model discloses a rapid round steel butt joint device which is mainly composed of a shell, clamping mechanisms symmetrically arranged at the two ends of the shell and a driving mechanism located in the shell. The clamping mechanism is connected with the shell in a sliding mode through a connecting sliding block and comprises a base fixed to the connecting sliding block, a lower arc-shaped base and an upper arc-shaped base on the base are connected in a hinged and threaded mode, and a clamping screw and an arc-shaped pressing block are arranged to stably clamp round steel. The driving mechanism comprises a driving rack fixed to the connecting sliding block, a driving gear meshed with the driving rack and connected with the driving rack through a rotating shaft, and a rotating disc. According to the device, through the ingenious structural design, on the aspect of butt joint precision, position deviation can be effectively reduced, the butt joint coaxiality of round steel is improved, and the high-end manufacturing requirement is met; in terms of working efficiency, the position of round steel can be rapidly adjusted, and working time is shortened; and in the aspect of safety, the round steel is prevented from sliding off, the device adapts to complex operation environments, and the remarkable application value in industrial production is achieved.

The invention relates to the technical field of enzyme engineering, in particular to a malic enzyme mutant and application thereof. Specifically, the malic enzyme derived from Escherichia coli is subjected to site mutation screening, and results show that after methionine at the 144th site is mutated into isoleucine (M144I), glutamine at the 253rd site is mutated into isoleucine (Q253I), and threonine at the 327th site is mutated into phenylalanine (T327F), the catalytic efficiency and the catalytic activity are obviously improved, which is of great significance to industrial application.

The utility model discloses an automatic lubricating device of electric door slide rail, and relates to the technical field of electric door slide rail; the utility model discloses a slide rail, two symmetrical chutes are seted up on the slide rail, the third connecting hole is seted up in the arbitrary one chute, the first installation slot is seted up on the slide rail, the one end of first installation slot inboard wall is close to the third connecting hole and is seted up with the connecting groove, the fixed block is installed in the third connecting hole, the utility model discloses the automatic lubrication through mechanical linkage, and the advantage is remarkable, utilizes the kinetic energy of slider to move to the top, through the force link and drives the piston, rubber bowl pressurization, makes the lubricating oil quantitative extrusion through the connecting hole, does not need manual intervention, can complete lubrication every time and moves, guarantees that the slide rail and the moving block keep good lubrication state continuously, reduces the friction wear, prolongs the life.

This invention discloses an adaptive PC-Kriging reliability analysis method and system based on active learning. The method includes: using weighted clustering to obtain uniformly distributed first candidate samples from a pre-generated MC sample pool and constructing an initial PC-Kriging model; using interval reduction to select samples and construct a new sample pool, dividing the new sample pool into two sub-sample pools: a safe domain and a failure domain; for each sub-sample pool, weighted clustering is used again to select uniformly distributed second candidate samples; using the second candidate samples distributed in the failure domain and the safe domain, crossing points are constructed; the constructed crossing points are used as new experimental points to iteratively update the PC-Kriging model; convergence is determined and the results are output. The technical solution of this invention focuses on key regions through interval reduction and updates the model based on crossing points, which can more accurately approximate the limit state surface, reduce the number of experimental points, improve prediction accuracy, and is more efficient in utilizing computational resources.

The utility model relates to bridge cable protection structure field discloses a kind of fire-resistant protective structure of bridge cable system, including heat insulation layer, fire-retardant sealing layer and protective layer sequentially arranged from inside to outside, and high-temperature-resistant adhesive glue is equipped between the heat insulation layer with the bridge cable. The heat insulation layer is excellent in thermal stability, and excellent in heat insulation effect;The fire-retardant sealing layer is formed by basalt fiber cloth or high-silica cloth and fire-retardant sealant, and the thickness of fire-retardant sealing layer is 3-6mm, and it is good in high-temperature resistance, fire resistance, vibration resistance and sealing property, and stable in structure;The high-temperature-resistant adhesive glue has excellent temperature resistance, adhesion, moisture resistance and vibration resistance. The protective layer uses silicone high-temperature paint, to further enhance the durability of protective structure. The fire-resistant protective structure of the bridge cable system has clear function, stable performance, easy construction, excellent heat insulation, fireproof and durable performance, and obvious comprehensive advantages.

The utility model discloses an intelligent flame positioning and identifying device which comprises a shell, a monitoring module is arranged below the shell, a display module is arranged on the side face of the shell, a data transmission module is arranged in the shell, and the monitoring module and the display module are both electrically connected with the data transmission module. The monitoring module comprises a shell, a light projection module and a sensing module, and the light projection module can collect fire image data of parking spaces on the two sides of a road. The display module is used for displaying remaining parking space information, and the sensing module can project empty parking spaces and indicate parking. According to the device, through cooperation of multiple modules, safety is improved, and convenience is brought; the monitoring module accurately captures a fire image, and early warning and linkage of fire fighting equipment are performed through the data transmission module; and the display module is matched with the sensing module to display the parking space information in real time and guide parking. The integrated structure is convenient to install, the cost is reduced, data support can be provided for a smart city, and practical value and market potential are achieved.

The present application belongs to the technical field of water conservancy and hydropower engineering closure construction, and particularly relates to a kind of embankment closure method based on integral assembly type double ridge closure bottom protection structure.The present application precast and accurately throw the integral bottom protection structure formed by rigid connection of bottom protection section and double ridge section in dry season of a year before closure, with standardized reinforced gabion as basic unit, adopt double connection inside and outside to form continuous plate type whole, with high impact resistance and stone blocking foot capacity.Through particle size and impact distance calculation, throw test, GPS joint positioning to realize accurate underwater throwing.After bottom protection construction is completed, embankment pre-advance is implemented in dry season of next year, and large stone and reinforced gabion are continuously thrown in closure stage, which can improve the stability of throwing material, prevent embankment collapse, and realize safe and rapid closure.The present application can solve the problems of traditional dispersed bottom protection, such as easy loss, low precision, interference with flood discharge, etc., and greatly improve the safety and efficiency of closure under complex riverbed conditions.

The invention discloses a modular panel based on a composite magnetic thin film, which belongs to the technical field of decorative panels and comprises a base layer, a first bonding layer, a magnetic functional layer, a second bonding layer and a surface layer which are sequentially arranged from bottom to top, the base layer and the magnetic attraction function layer are fixed through a first bonding layer, and the magnetic attraction function layer and the surface layer are fixed through a second bonding layer; the magnetic attraction functional layer comprises a base material and soft magnetic powder, and the magnetic attraction functional layer is a sheet-shaped continuous magnetic composite material film; and the soft magnetic powder is subjected to high-temperature passivation treatment. Through systematic innovation of the continuous soft magnetic functional layer, the integrated composite structure and process adaptation, the core problems that an existing magnetic panel is poor in flatness, uneven in magnetic force distribution, low in production efficiency, insufficient in reliability and single in adaptability are fundamentally solved. And the comprehensive advantages of high flatness, uniform magnetic attraction, efficient production, long acting, reliability and multi-scene adaptation are realized.

The anti-recoil device comprises a shell, a first braking cavity, a second counter-recoil cavity and a third counter-recoil cavity, the shell is installed at the top of a gun barrel, the first braking cavity is formed in the middle of the shell, and the second counter-recoil cavity and the third counter-recoil cavity which are located on the left side and the right side of the first braking cavity respectively are formed in the shell. Traveling pistons are arranged on the inner sides of the second counter-recoil cavity and the third counter-recoil cavity; a pull rod piston is arranged on the inner side of the first braking cavity, a first recoil valve and a first counter-recoil valve are arranged between the first braking cavity and the second counter-recoil cavity, a second recoil valve and a second counter-recoil valve are arranged between the first braking cavity and the third counter-recoil cavity, and inclined partition plates are arranged on the inner side of the second counter-recoil cavity and the inner side of the third counter-recoil cavity. The anti-recoil device of the artillery is arranged at the top of the artillery barrel, so that the torsion of the artillery carriage during recoil and counter-recoil of the artillery is reduced, the deviation degree of an aiming line is reduced, and the continuous shooting of the artillery is facilitated.

This application relates to the technical field of machining mechanical parts, and more particularly to a fixture for plate-shaped workpieces, including a support platform and a clamping mechanism disposed on the support platform. The clamping mechanism includes: a first clamping assembly for clamping the edge of the plate-shaped workpiece and a second clamping assembly for abutting the bottom of the workpiece. The first clamping assembly includes: a first clamping cylinder, a first clamping block, and a rotating shaft. The first clamping block is arranged parallel to the platform surface of the support platform. The first clamping cylinder is vertically fixed to the platform surface of the support platform. The piston rod of the first clamping cylinder is connected to the first clamping block through the rotating shaft, so that the first clamping block can rotate bidirectionally around the shaft while rising and falling. The initial position of the first clamping block is set along the length direction of the platform surface of the support platform, and the angle formed by bidirectional rotation is 45°. This structure can adjust the clamping position of the clamping component on the plate-shaped mold, increase the clamping contact area between the clamping component and the edge of the plate-shaped mold, thereby enhancing the clamping stability of the workpiece.

The utility model provides a kind of storage bin for storing straw biomass, including warehouse wall, door body, warehouse floor and roof. Warehouse wall side is equipped with air inlet and installs air guide machine, air guide machine is connected with the air outlet pipeline embedded in floor, including main air pipe and transverse air distribution pipe, realize three-dimensional ventilation;Roof is equipped with multiple unpowered turbine roof ventilator, bottom has dustproof grille, accelerates air flow, discharges humid hot gas. Track-type crown block is arranged under roof truss, including movable front and rear moving seat, transverse moving seat and winch grab, grab is driven arc-shaped grab hand by pneumatic cylinder, realizes mechanized loading and unloading. Warehouse floor is divided into unloading area and storage area, and the storage area is provided with a label area and a reflective identification belt. The outer side of the air inlet has a detachable filter screen, and a 360-degree panoramic camera is arranged on the inner side of the roof and connected with the central control console. The application realizes active and passive coordinated ventilation, mechanized loading and unloading and monitoring management, effectively inhibits mold growth and improves storage efficiency.

The invention relates to a rare disease identification method and system based on multi-scale vision-language prompt multi-instance learning, and the method faces a full-view digital pathological image (WSI), and introduces the prior knowledge of the pathological field under the weak supervision condition of only using a slice-level label, so as to identify the rare disease. Constructing a multi-scale vision-language collaborative prompt mechanism: generating descriptive text prompts corresponding to image blocks of different scales by utilizing a large language model, designing a prototype-guided image block decoder to aggregate massive image block features, and meanwhile, realizing cross-modal alignment in combination with a context-guided text decoder; the method simulates the diagnosis process of a pathologist, achieves high-precision classification under small samples, remarkably improves the recognition accuracy of rare diseases, has good cross-center generalization ability, supports interpretable evidence output, does not need large-scale data labeling or de novo pre-training, and facilitates clinical rapid deployment.

This invention belongs to the field of catalyst preparation and application technology, and discloses a method for preparing sulfur-bridged bimetallic alkyne complexes and their application in the dehydrogenation coupling synthesis of 1,4-diyne. The method uses thiols or thiophenol salts as bridging ligands, with each metal center coordinated with a cyclopentadienyl group or a substituted cyclopentadienyl group. This invention achieves coordination activation of the terminal alkyne by controlling the oxidation state of the metal center and altering the bonding mode of the terminal alkyne at the metal center. In this system, the sulfur-bridged ligand not only assists the metal center in activating the terminal alkyne but also stabilizes a key intermediate in the catalytic process. Subsequently, the coordinated-activated terminal alkyne undergoes a reductive elimination process to generate 1,4-diyne. This reaction can be carried out in a temperature range of -100℃ to 25℃, with a reaction time of 0.5 to 48 hours. This method can synthesize a series of novel sulfur-bridged bimetallic alkyne complexes with high yield and high selectivity, providing a novel catalytic system for the activation of C-H bonds in terminal alkynes mediated by inexpensive metals and the further synthesis of 1,4-diyne.

The invention belongs to the field of polyurethane hybrid glue, and particularly relates to wide-temperature-range polyurethane hybrid glue and a preparation method and application thereof.The wide-temperature-range polyurethane hybrid glue comprises a component A and a component B. When the component A and the component B are mixed, the NCO / OH molar ratio is controlled to be 1.05-1.2: 1; the component A is prepared from the following components in parts by weight: 10 to 30 parts of polyether polyol, 10 to 30 parts of castor oil modified polyol, 5 to 20 parts of hydroxyl-terminated polybutadiene, 1 to 8 parts of chain extender, 20 to 40 parts of filler, 2 to 6 parts of fumed silica, 1 to 3 parts of water absorbent, 1 to 3 parts of coupling agent and 0.1 to 0.5 part of catalyst; the component B is prepared from the following components in parts by weight: 10 to 30 parts of hydroxyl-terminated polysiloxane, 20 to 40 parts of isocyanate, 15 to 40 parts of filler and 2 to 5 parts of fumed silica. The wide-temperature-range two-component polyurethane structural adhesive prepared by the invention can be applied to new energy automobile power battery bonding and structural bonding.

This invention relates to the field of traditional Chinese medicine, specifically to a traditional Chinese medicine composition for treating insomnia, characterized by being made from the following raw materials in parts by weight: 5-45 parts of stir-fried jujube seed, 3-35 parts of cypress seed, 5-30 parts of poria cocos, 5-30 parts of mulberry, 3-18 parts of dried plum, 1-10 parts of costus root, 3-18 parts of privet fruit, 2-16 parts of lycium chinense root bark, and 2-16 parts of fleeceflower stem. This invention also provides a traditional Chinese medicine compound preparation for treating insomnia and its application.

The present invention relates to a transmitting device (100) and a receiving device (300) of a wireless communication system (500). The transmitting device is configured to transmit one or more synchronization signals on a carrier to at least one receiving device, wherein a frequency of a synchronization signal of the one or more synchronization signals is located on a first frequency raster, a carrier frequency of the carrier is deployed on a second frequency raster, and frequencies of two different synchronization signals of the one or more synchronization signals are located on different frequency locations in the first raster, and to transmit an indication of the carrier frequency to at least one receiving device (300), wherein the indication comprises at least one integer. The receiving device (300) is configured to obtain the carrier frequency based on the at least one integer. Furthermore, the present invention also relates to corresponding methods and computer programs.

The utility model relates to hydrogen energy protection technical field, concretely relates to a hydrogen energy protection device. It includes support frame main part, support frame main part top is equipped with a plurality of for placing hydrogen jar's placing groove, support frame main part top is provided with fixed assembly, support frame main part top is provided with clamping limiting assembly, clamping limiting assembly slides in support frame main part top, when clamping limiting assembly slides to certain position. Through placing hydrogen jar into placing groove, sliding clamping limiting assembly makes it cooperate with fixed assembly and forms a cavity structure for fixing multiple hydrogen jars, can quickly complete the fixing of multiple hydrogen jars, when loading and unloading goods, greatly reduce the time of installation and disassembly, especially when transporting multiple hydrogen jars, the advantage is more obvious, also avoid the help using other tools to fix hydrogen jar.

This invention provides an aptamer targeting the growth hormone receptor and its uses, the nucleotide sequence of which is shown in SEQ ID NO.1 or SEQ ID NO.2. This invention utilizes a modified SELEX technique to perform multiple rounds of screening targeting recombinant GHR protein, obtaining specific nucleic acid aptamers with high affinity for GHR (KD values ​​at the micromolar level). In vivo distribution experiments show that the fluorescently labeled aptamer can efficiently and specifically accumulate in white adipose tissue (including inguinal and gonadal fat) at the in vivo level, exhibiting excellent tissue targeting. The nucleic acid aptamer and its derivatives of this invention can be used to prepare drugs or diagnostic reagents targeting adipose tissue, for example, for the prevention or treatment of metabolic diseases such as obesity, type 2 diabetes, fatty liver, hyperlipidemia, or cardiovascular disease.

The invention relates to the field of traditional Chinese medicines, and particularly discloses traditional Chinese medicinal liquor with functions of benefiting qi, nourishing blood and resisting aging and application thereof. The medicinal liquor is prepared from the following components in equal parts (45-55 parts respectively): radix polygonati officinalis, ginseng, poria cocos, fructus lycii, wine-processed rhizoma polygonati, rose, pericarpium citri reticulatae and longan. The preparation method comprises the following steps: 1) crushing the raw materials, adding water, performing reflux extraction twice, combining filtrate, and concentrating until the relative density is 1.15-1.25 g / mL; 2) adding 8-16% mulberry raw wine which is 20-40 times of the total weight of the raw materials into the extracting solution, and stirring for 3-7 days; 3) adding mulberry juice to adjust the sugar degree to 40-100g / L; (4) standing for 10-30 days, taking supernate, and freezing at-10 to-20 DEG C for 1-3 days; and 5) sterilizing the frozen supernatant at 80-100 DEG C, filtering while the supernatant is hot, and filling to obtain a finished product. The medicinal liquor can be used for preparing medicines for benefiting qi, nourishing blood and resisting aging.

The utility model discloses a hand-drawn paper auxiliary device of construction, relates to the technical field of hand-drawn building drawing, including box, both sides in the inside of box are fixedly connected with and place the box, the inside middle part fixed mounting of box has the adjusting mechanism, the rear side hinged of box has the box cover. The utility model adopts the above structure, and the adjusting mechanism that the present device sets brings great flexibility and convenience, and the user operates the handle and drives the screw rod to rotate, and the sliding block slides in the guide rail, and the drawing board is turned over to the up to the driving guide plate, and the angle can be adjusted flexibly to satisfy different drawing needs, after using, pulling operation handle can make the sliding block reset, and the drawing board is placed in the box, and the box cover is closed and is locked the box lock, and the operation handle is stored in the strip slot, and the magnetic block magnetism attracts the operation handrail, and it is convenient to carry, no matter in the studio, outdoor or other places, can satisfy the demand of the drawing person.

The application relates to the technical field of hole depth detection, and particularly discloses a hole depth data rapid detection device and a method thereof, which comprises a base, a measuring mechanism, a top plate unit and a measuring rope distributed along a measuring rod. The measuring rod comprises a plurality of first folding rods and a plurality of second folding rods arranged oppositely, the first folding rods and the second folding rods are connected in an up-down rotation mode, and the top of the measuring rope is fixed to the uppermost part of the measuring rod. The top plate unit comprises two groups of conveying belts arranged vertically on the two sides of the measuring rod, the conveying belts are respectively provided with a first top plate capable of driving the first folding rods to move vertically and a second top plate capable of driving the second folding rods to move vertically. The application can efficiently and accurately realize hole depth detection, and is simple in structure and suitable for promotion.

This invention belongs to the field of environmental industrial water treatment technology, and discloses a modified lignin-attapulgite composite material, its preparation method, and its application. Method: Activated enzymatically hydrolyzed lignin is covalently grafted with a thiol reagent via a nucleophilic substitution reaction under inert gas protection, alkaline conditions, a catalyst, and a polar aprotic solvent system to obtain thiolized enzymatically hydrolyzed lignin. Attapulgite is mixed with an aqueous solution of an active metal component, ultrasonically dispersed, and then an alkaline solution is added dropwise, followed by calcination to obtain Me-ATP. Water, Me-ATP, thiolized enzymatically hydrolyzed lignin, and a penetrant are mixed and subjected to a hydrothermal reaction to obtain S / EHL-Me-ATP. This S / EHL-Me-ATP is dispersed in a spherical polymer molding solution, then added dropwise to water. After phase separation, spherical particles are obtained, and after standing, the composite material is obtained. This invention improves the adsorption selectivity, adsorption capacity, and regeneration performance of the composite material for pollutants. The composite material is less prone to agglomeration, its mechanical strength is significantly improved, and recycling is simpler.

The application provides a detection method of a blood glucose-lowering active ingredient TrpCA of paracasei Lc19, which comprises the following steps: S1, pretreating a to-be-detected sample by using a methanol aqueous solution to obtain a detection solution; and S2, analyzing the detection solution by using a high performance liquid chromatography-fluorescence detector to determine the content of the TrpCA, wherein an impurity trapping column is arranged between a gradient mixer and a sample injector in the high performance liquid chromatography-fluorescence detector. The application utilizes the structural characteristics (endogenous fluorescence chromophore-indole ring) of the TrpCA, realizes accurate detection of the TrpCA with a sodium molar per liter level by means of the characteristic fluorescence of the indole ring and by optimizing the detection steps and chromatographic conditions. The method provided by the application has high sensitivity, high accuracy and high selectivity, and is simple to operate, economical in cost and widely applicable.

The invention relates to a method for preparing a C-7-position glycoside compound by using an isoflavone aglycone compound, and belongs to the technical field of biology. According to the method, an isoflavone aglycone compound is taken as a substrate, a belamcanda chinensis glycosyl transferase gene BcUGT009 gene encoding protein, a belamcanda chinensis glycosyl transferase BcUGT032 gene encoding protein or a belamcanda chinensis glycosyl transferase BcUGT124 gene encoding protein is taken as a catalyst, uridine diphosphate glucose is taken as a glycosyl donor, and C-7-site glycosylation reaction is performed to generate the corresponding glycoside compound. According to the application, the functions of the three glycosyl transferase genes BcUGT009, BcUGT032 and BcUGT124 in the blackberry lily are identified and verified for the first time, the effects of the three glycosyl transferase genes in catalyzing flavonoid aglycones to generate C-7 glucoside are defined, the blank of research on a specific flavonoid glycoside biosynthesis pathway of the blackberry lily is filled, and important information is provided for research on a biosynthesis mechanism of active ingredients of medicinal plants.

The present invention relates to an impeller housing (5) for a pump, the impeller housing (5) having an inlet wall, wherein the impeller housing (5) has an inlet radius measured from an axially extending central axis (A) to a circular intersection (11) between the inlet wall and the upper surface (12) of the impeller housing (5), the impeller housing (5) including a guide pin (13) connected to and extending radially inward from the inlet wall, the guide pin (13) having an end radius measured from the axially extending central axis (A) to the radially innermost portion of the guide pin (13), wherein an imaginary 15% circle (23) is radially offset from the circular intersection (11) by fifteen percent of the difference between the inlet radius (R) and the end radius (r), the impeller housing (5) including a feed groove (14) arranged in the upper surface (12) of the impeller housing (5) and extending from the inlet wall (10) to the periphery of the impeller housing (5). The impeller seat (5) is characterized in that, viewed from the direction of rotation of the pump (1), the upstream edge line (34) of the slot inlet is the radius at which the impeller seat (5) intersects with the upstream edge (35) of the feed slot (14) at the circular intersection (11), wherein the upstream edge angle (λ) of the slot inlet between the radius at which the impeller seat (5) intersects with the upstream edge of the guide pin (13) at the 15% circle (23) viewed from the direction of rotation of the pump (1) and the upstream edge line (34) of the slot inlet is equal to or less than 20 degrees and equal to or greater than 0 degrees. The invention also relates to pumps comprising such an impeller seat.

The invention belongs to the technical field of water pumps, and particularly relates to a water pump shell which comprises a pump head body, the pump head body is provided with a low-pressure water inlet part, a pressurizing part and a high-pressure water outlet part, the low-pressure water inlet part is provided with a water inlet and a flow switch, an impeller is arranged in the pressurizing part, and the high-pressure water outlet part is provided with a water outlet and a pressure sensor. A first mounting opening is formed in the surface of the high-pressure water outlet part, a support assembly is arranged in the first mounting opening, and the pressure sensor is mounted through the support assembly; according to the utility model, the installation of the pressure sensor is realized through the support assembly, and a manufacturer does not need to form a threaded opening structure for connecting the pressure sensor at the high-pressure water outlet part through the support assembly which is matched and internally and externally connected.

The utility model provides a kind of multifunctional metalworking fixture, it is related to metalworking equipment technical field, comprising: annular support assembly, annular support assembly is constituted by annular fixed frame and four easy-to-disassemble sleeves, four easy-to-disassemble sleeves are annularly distributed on annular fixed frame, and the spacing between adjacent two easy-to-disassemble sleeves is equal, by the setting of clamp assembly in the process of use first by hydraulic push rod driving fixture base displacement close to material side, and by clamping guide wheel extruding and clamping the outer wall of circular material, further under the action of pivot, so that clamping guide wheel and fixture base are detachable structure, so in the process of use, can screw cap is spun from the both sides of pivot, clamping guide wheel is taken down, and replaceable clamping guide wheel that is adapted to material can, to improve the diversity of the device in use, so that the device can clamp material of different external shape.