153 results about "Axial distribution" patented technology

The invention discloses a reflooding cooling process analysis method and system. The method comprises the following steps: step 1, obtaining reflooding process data; 2, according to the re-submerging process data, obtaining a liquid core shear stress relation and a constitutive relation, and obtaining a disturbance wave height; 3, according to local shock cooling in the cooling process, a liquid film dynamic equilibrium relation is constructed, and the average vapor film thickness is obtained; 4, axial distribution of the minimum film state boiling temperature is obtained according to the disturbance wave height and the average steam film thickness; 5, shock cooling moments at different axial heights are obtained according to the axial distribution of the minimum film state boiling temperature, the relationship among the shock cooling speed, the shock cooling moments and the heights is obtained, the shock cooling speed of all the shock cooling moments is solved, and then analysis of the re-submerging cooling process is completed; according to the method, the problem of strong correlation of time-physical behaviors of two-phase evolution in the whole re-submerging process is solved, and accurate prediction of the whole strong transient re-submerging cooling process is realized.

The invention discloses a welding device for a longitudinal submerged arc welding pipe, which comprises a steel pipe semi-finished product which is formed by rolling a steel plate through a forming machine, a shaping mechanism which is horizontally arranged and can allow the steel pipe semi-finished product to pass through in a matched manner and form positioning in the circumferential direction of the steel pipe semi-finished product, and a V-shaped roller way conveyor which is arranged on the shaping mechanism, the V-shaped roller way conveyor is arranged at the input end of the shaping mechanism in a butt joint mode and used for feeding semi-finished steel pipe products, the welding mechanism is erected at the output end of the shaping mechanism and used for welding the splicing positions of the semi-finished steel pipe products, the aligning mechanism is arranged between the shaping mechanism and the V-shaped roller way conveyor and used for adjusting the positions of V-shaped grooves, and the limiting guide mechanism is arranged between the welding mechanism and the shaping mechanism and used for limiting the positions of the V-shaped grooves. The invention relates to the technical field of welding equipment. According to the welding device for the longitudinal submerged arc welding pipe, by introducing the alignment mechanism, automatic alignment of a V-shaped groove in a semi-finished steel pipe and the output end of the welding mechanism is achieved, dependence on manual adjustment is reduced, and the alignment precision is improved.

The invention discloses a drilling-based advanced geological forecast device and a detection method, and relates to the technical field of geological exploration. When the drilling rate of a certain section changes, the depth range of the section is recorded as a detection section; an advanced geological forecasting device is placed in the drill hole; water is injected into the hollow push rod in a pressurized mode in a quantitative pressurized water injection mode, the water injection pressure change is observed and compared with the pressure change of the standard section, and the crushing degree of the unfavorable geologic body is quantitatively judged according to the pressure attenuation degree and the pressure time curve. And obtaining the bad degree and the axial distribution range of the bad geologic body according to the stress distribution range collected by the stress sensor. By adopting the scheme, the waste of procedures is avoided, the support of the excavated hole section has no influence on the test, the datamation degree of the test result is high, the influence of subjective judgment is reduced, and the method is more favorable for carrying out data quantitative comprehensive analysis by combining other advanced forecasting means in the later period.

Telescopic rod, characterized in that it comprises an inner tube (1) and an outer tube (2) which is mounted coaxially outside the inner tube (1), wherein the locking seat (3) is provided between the inner tube (1) and the outer tube (2), wherein the locking seat (3) is fixedly connected to an end of the inner tube (1) which is provided inside the outer tube (2), wherein a cavity (31) is provided inside the locking seat (3), wherein the cavity (31) is provided with a sliding groove (32) along a radial direction of the inner tube (1), wherein a sliding block (33) is slidably connected to the sliding groove (32), wherein the sliding block (33) is provided with a positioning pin (34) at one end facing the radial direction, wherein the positioning pin (34) moves with the sliding block (33).and wherein an elastic element (35) is provided between another end of the sliding block (33) facing the radial direction and the cavity (31), wherein a roller (36) is rotatably provided inside the cavity (31), and wherein the roller (36) and the positioning pin (34) are each located at the two end positions of the elastic element (35), wherein the sliding block (33) is attached to a pull rope (37), wherein one end of the pull rope (37) is connected to the end of the sliding block (33) abutting the elastic element (35), and wherein the other end extends axially along the axial direction of the inner tube (1) as the force application end after being wound around the roller (36), wherein, when a driving force is applied to the force application end of the pull rope (37) and the pull rope (37) is pulled, the pull rope (37) moves the sliding block (33) along the roller (36). pullsso that the sliding block (33) compresses and slides the elastic element (35), causing the positioning pin (34) to contract, wherein when the driving force is withdrawn at the force application end, the sliding block (33) slides in the opposite direction under the restoring force of the elastic element (35), causing the positioning pin (34) to extend, wherein the locking seat (3) is provided on a circumferential wall with a first radial through-hole (39) for the telescopic movement of the positioning pin (34), and wherein the inner tube (1) is provided at a corresponding location with a second radial through-hole (12) so that the positioning pin (34) can perform a telescopic movement along the first radial through-hole (39) and the second radial through-hole (12).wherein the outer tube (2) is provided with a plurality of positioning holes (21) along the axial direction, which are distributed in a straight line, wherein, when the positioning pin (34) is in a contracted state, the outer tube (2) and the inner tube (1) can slide relative to each other in the axial direction, and wherein, when the positioning pin (34) is in the extended state, the positioning pin (34) extends through the second radial through-hole (12) into the positioning hole (21) to form a positioning, wherein the outer tube (2) and the inner tube (1) form a locking mechanism.

The utility model discloses an outer taper sleeve of a rolling mill, and belongs to the technical field of outer taper sleeves of rolling mills. The outer taper sleeve of the rolling mill comprises a main body part, one end of the main body part is provided with a threaded connection end, the other end of the main body part is provided with an inner taper structure, the side, close to the inner taper structure, of the main body part is provided with annularly-distributed long holes at equal intervals, and the inner wall of the main body part is provided with axially-distributed lubricating grooves. A check ring groove is formed in the outer wall of the main body part. According to the outer taper sleeve of the rolling mill, the firmness and the stability of overall assembly are greatly enhanced by arranging the threaded connection end and adopting a dual-connection mode, higher positioning accuracy is achieved by the design of the inner taper structure and the elastic deformation capacity provided by the expansion groove, the concentricity of two components is ensured, and the service life of the rolling mill is prolonged. Torque transmission and axial force bearing are facilitated, and the pre-tightening force of the locking nut is increased through the design of the sealing ring in the sealing groove.

The embodiment of the utility model provides a turbo molecular pump which comprises a shell provided with a containing cavity and comprising an air inlet port and an air outlet port; the rotating shaft is arranged in the accommodating cavity; the first end of the rotating shaft is close to the intake port; the second end of the rotating shaft is close to the exhaust port; the extension direction of the exhaust port is parallel to the axial direction of the rotating shaft; or a first included angle is formed between the extension direction of the exhaust port and the axial direction of the rotating shaft; the first included angle is smaller than or equal to 30 degrees; the plurality of rotors are axially distributed along the rotating shaft; each rotor is distributed along the circumferential direction of the rotating shaft; when the rotating shaft rotates, the rotating shaft drives the multiple rotors to move together so as to drive airflow in the containing cavity to flow from the air inlet port to the air outlet port.

The utility model relates to the field of operation machinery, and discloses an axle housing, an axle assembly and operation machinery. The axle housing comprises an axle package structure; the axle tube structure comprises a mounting part and a connecting part, the mounting part and the connecting part are distributed in the axial direction of the axle tube structure, and the connecting part is connected with the mounting part and the axle package structure; the two side walls of the connecting part are connected with the two side walls of the mounting part in a one-to-one correspondence mode, the two side walls of the connecting part are gradually close to each other in the direction from the mounting part to the axle package structure, and the connecting part deviates from the inner surface of the axle tube structure and is gradually away from the axis of the axle tube structure. The two side walls of the connecting part are gradually close to each other, so that the sections of the mounting part and the connecting part are in smooth transition, and the section of the connecting part is gradually reduced, so that the sections of the connecting part and the axle package structure are in smooth transition, and the condition of stress concentration between the mounting part and the connecting part can be reduced; and the stress concentration between the connecting part and the axle package structure is avoided.

The utility model provides an adjustable pipeline support, which aims to solve the technical problem of axial displacement caused by thermal expansion and cold contraction of a chemical pipeline, and comprises a fixed base and a sliding base which is connected above the fixed base in a sliding manner along the axial direction of the fixed pipeline, the pipeline fixing assembly comprises a first fixing assembly, a second fixing assembly and an adjusting screw rod, the length of the adjusting screw rod is rotationally connected to the sliding base in the radial direction of a to-be-fixed pipeline, and the adjusting screw rod is provided with a first threaded section and a second threaded section which are opposite in rotating direction in the length direction; the first fixing assembly and the second fixing assembly are in threaded connection with the first threaded section and the second threaded section correspondingly. The axial buffering assembly is composed of a guide shaft and a first buffering spring, the length of the guide shaft is distributed in the axial direction of the to-be-fixed pipeline, one end of the guide shaft is fixedly connected with the fixed base, the other end of the guide shaft is located on the outer side of the sliding base in the axial direction of the to-be-fixed pipeline, the guide shaft is sleeved with the first buffering spring, and the two ends of the first buffering spring are connected with the fixed base and the sliding base respectively.

A hinge mechanism and an electronic device. A hinge mechanism applied to an electronic device, the hinge mechanism comprising: a support (11), a first swing arm assembly (13), and a damping assembly (12), wherein the first swing arm assembly (13) and the damping assembly (12) are both movably connected to the support (11) by means of a first pivot assembly (15), and the damping assembly (12) abuts against a side end face of the first swing arm assembly (13); and the support (11) is provided with a limiting hole and a limiting groove distributed in the axial direction of the first pivot assembly (15), the first pivot assembly (15) passes through the damping assembly (12) and the limiting hole in sequence and is inserted into the limiting groove, the limiting hole is a through hole extending in the axial direction, and the limiting groove has a first groove opening (11131) and a second groove opening (11132), the first groove opening (11131) being opposite the limiting hole, the second groove opening (11132) being located in a surface adjacent to the first groove opening (11131), a groove wall of the limiting groove limiting the first pivot assembly (15) in a first direction, and the first direction being a direction perpendicular to the plane where the support is located. The problem of warping of the damping assembly can be solved, so that the hinge mechanism maintains a good flatness.

The utility model discloses a scattering and quality guaranteeing device which comprises a cylinder body, a feeding mechanism and a scattering mechanism, the cylinder body extends from a first end to a second end in the length direction, the first end is provided with a feeding port, the second end is provided with a discharging port, the cylinder body comprises a conveying section and a scattering section in the direction from the feeding port to the discharging port, the feeding mechanism is arranged on the conveying section, and the scattering mechanism is arranged on the scattering section. The feeding mechanism comprises a first rotating shaft and a spiral blade, the spiral blade spirally extends in the axial direction of the first rotating shaft and is rotationally installed on the barrel through the first rotating shaft, the scattering mechanism is arranged on the scattering section and comprises a second rotating shaft and a plurality of scattering blades, and the scattering blades are distributed in the axial direction of the second rotating shaft. According to the technical scheme of the utility model, the feeding mechanism and the scattering mechanism are simultaneously arranged in the barrel body, so that lumps generated in the quality guarantee process can be effectively scattered by virtue of the scattering blades, the materials are ensured to uniformly enter the granulator to the greatest extent, and the problem that the conditioning and granulating effects are poor due to the fact that the traditional quality guarantee device is easy to agglomerate is solved; the product quality is ensured.

The utility model discloses an anti-deflection fan, and aims to provide an anti-deflection fan which can effectively improve the stress uniformity of a rotor during operation and is not easy to generate axial deflection, so that the problem of unbalanced swinging in the operation process of the fan is solved, the service life of a bearing is prolonged, and abnormal sound is reduced. The device comprises a base; the outer rotor motor comprises an outer rotor and a stator, the stator is fixed on the base, blades are arranged on the outer rotor, a middle shaft is fixed on the outer rotor, the middle shaft of the outer rotor is rotationally arranged on the base through a bearing, and the outer rotor comprises a plurality of magnets which are uniformly distributed in the circumferential direction; and the attraction piece is fixed on the stator or the base, the magnets in the outer rotor and the attraction piece are distributed in the axial direction of the middle shaft, the magnets in the outer rotor are located on the same side of the attraction piece, attraction is generated between the attraction piece and the magnets in the outer rotor, and the attraction between each magnet and the attraction piece is the same.

This invention discloses a compressor and refrigeration equipment, relating to the field of compressor technology. The compressor includes a motor and a cylinder. The motor includes a stator core and windings, with the windings located on the stator core. The maximum outer diameter of the stator core is D1, and the axial length of the stator core along the compressor is L. The cylinder and stator core are distributed axially, with the axial height of the cylinder being H and the inner diameter being D2, satisfying: where U is the maximum voltage of the compressor in V, B is the gauge pressure of the compressor in MPa, and D1, L, D2, and H are in mm. The technical solution provided by this invention aims to match the magnetic load capacity of the stator core with the mechanical load of the compressor, avoiding material waste and ensuring the energy efficiency of the compressor.

The utility model discloses a cylindrical bone drill relates to the field of medical devices, and the cylindrical bone drill includes: drill body and the coaxial setting connecting handle with it, wherein, the drill body is the cylindrical structure of diameter 2.2 5.8mm, in the drill body including the spiral cutting head of integral processing formation, the spiral cutting head is by 4 10 spiral distribution cutting blade of the axial distribution of drill body constructs, and the front blade of every cutting blade is 58 62 with drill body axis angle of clamping, and the depth value of cutting blade is 0.5 1.45mm, and the outer periphery of drill body is equipped with the marking unit that the annular concave point circle group of the axial interval of 1 3mm is composed, the cylindrical bone drill of the utility model has cutting stable, bone mud delicate, mark clear and the like advantage, is applicable to the precision oral surgery such as planting, periodontal in autogenous bone collection and bone mud preparation, improves the operation efficiency and accuracy.

The present invention relates to a method for optimizing the axial spatial distribution of grinding media inside a drum mill based on a liner modification design, and belongs to the field of grinding optimization technology. A process survey is conducted on the grinding section of a concentrator to obtain the material particle size composition of each sampling point; the panel angle of the drum mill liner is modified and designed: the panel angle of the liner design is 45°-90°; the drum mill liner is divided into 2-4 sections for axial combination and installation to obtain drum mill liners with different section panel angle combinations, and then the drum mill liners with different section panel angle combinations are simulated based on the discrete element method, and the best combination of the axial spatial distribution of grinding media inside the drum mill is selected based on the characteristics of coarse particles at the feeding end and fine particles at the discharging end. The present invention optimizes the axial spatial distribution of steel balls by adjusting the axial distribution of different liner structures, thereby achieving the purpose of improving energy utilization efficiency and reducing over-crushing of minerals.

The stirring device, in particular for a fluid-mixing bioreactor, comprises a drive shaft including a rod, an agitating element and a sleeve of tubular shape. The sleeve forms a coupling sleeve receiving the shaft therethrough and is directly rotationally coupled to the rod. The agitating element, which has a hub with an annular side wall delimiting an inner space and an impeller assembly comprising blades, is indirectly rotationally coupled to the rod via the sleeve that is engaged in the inner space. One of an inner surface of the wall and an outer surface of the sleeve is a guiding surface with progressively reduced cross section. Axial movement between the hub and the sleeve is prevented in a locked configuration of a sleeve fastening arrangement. Hub-sleeve contact areas can be axially distributed.

The utility model relates to the technical field of PE pipes, in particular to a high-strength compression-resistant PE pipe which comprises a pipe body made of PE materials, a protective layer wrapping the outer side of the pipe body, a buffer layer arranged between the pipe body and the protective layer and a supporting layer arranged on the outer wall of the pipe body. The supporting layer comprises supporting rings distributed in a spiral mode, by designing the spiral distribution design of the supporting rings with the I-shaped sections, the problem of circumferential stress concentration of a traditional PE pipe is effectively solved, mechanical complementation is formed between flanges of an I-shaped structure and a web, the contact area between the flanges and the inner wall and the outer wall of the pipe body is enlarged, and uniform load transmission is achieved. The web plates vertically support the radial pressure of the pipe body, the circumferential compressive rigidity of the pipeline is remarkably improved, pipe wall collapse caused by local stress concentration can be avoided, and the structural integrity of the pipeline under long-term pressure is guaranteed.

The utility model discloses a valve seat sealing ring capable of adjusting sealing performance, which relates to the technical field of valve seat sealing rings, and aims to solve the technical problem that the valve seat sealing ring cannot be adjusted according to medium pressure fluctuation or working condition change at present, the valve seat sealing ring comprises a valve body, the inner wall of the valve body is provided with thread grooves which are axially distributed, and the inner wall of the valve body is provided with a thread ring in a threaded manner; an adjusting ring is fixedly installed in the threaded ring, a sealing ring is installed on the screwing-in face of the adjusting ring in a nested mode, and elastic fins are evenly distributed in the adjusting ring in the circumferential direction. The adjusting ring is driven by the threaded ring to move axially, the compression amount of the sealing ring is adjusted by combining the stepped clamping structure of the adjusting clamping block and the adjusting clamping groove, after the sealing ring is damaged, the compression amount of the sealing ring can be continuously adjusted by rotating the adjusting ring, the sealing ring does not need to be replaced immediately, emergency use is facilitated, and the service life of the sealing ring is prolonged. The problem that the current sealing ring needs to be replaced immediately after being damaged, and continuous operation of a system is affected is solved.

The automatic turnover device for the polyester calandria product solves the technical problems that in the production process of the polyester calandria in the prior art, in the double-sided visual defect inspection operation process of a semi-finished product, manual reverse side operation is needed, time and labor are wasted, and the requirement for large-batch production cannot be met. The automatic turnover device for the polyester calandria product comprises a transmission device and a turnover mechanism, the transmission device comprises a motor and a transmission rotating shaft, and an output shaft of the motor is connected with the transmission rotating shaft to drive the turnover mechanism to rotate; a plurality of sets of turnover mechanisms are distributed on the transmission rotating shaft in the axial direction, each set of turnover mechanism is provided with a plurality of sets of turnover teeth which are arranged side by side at intervals, and the distance between every two sets of turnover teeth is matched with the distance between every two adjacent polyester calandrias. The device can be widely applied to the technical field of polyester calandria processing equipment.

The utility model relates to a pressure stabilizing type expansion body anchor rod, which belongs to the technical field of geotechnical engineering anchoring and is used for solving the problem of non-uniform anchoring force distribution caused by limited contact area of a single-diameter expansion body section, insufficient uplift bearing capacity and eccentric installation of a traditional anchor rod. According to the technical scheme, an anchor rod body is composed of a center force bearing rod and a peripheral positioning assembly, and the positioning assembly guides the anchor rod to be centered through an elastic positioning piece and an arc guide face; the variable cross-section expansion body mechanism comprises a plurality of expandable sections which are axially distributed, each section forms an expansion body structure with different diameters through independent grouting, and the whole expansion body structure is in a step shape or a frustum shape. The anti-pulling performance of the anchor rod is improved by increasing the contact area and the occlusal force of the anchor rod and a rock-soil body, and the anchor rod adapts to different anchoring requirements of complex stratums and is suitable for engineering scenes such as slope supporting and foundation pit reinforcing.

The utility model relates to an oil seal structure of an input end of a step-up gear box. The input shaft is supported by a bearing, the gear and the coupler are connected with the input shaft, the input shaft comprises a first shaft section and a second shaft section which are different in diameter, an oil slinger is arranged on the second shaft section, the first shaft section is connected with the coupler, and a plurality of oil slinger grooves are distributed in the axial direction of the second shaft section; the sealing piece is connected with the end cover and arranged on the second shaft section in a sleeving mode, a plurality of sealing teeth extending in the direction close to the second shaft section are arranged in the axial direction of an inner hole of the sealing piece, labyrinth cavities are formed between the oil throwing grooves and the two adjacent sealing teeth on the two sides of the oil throwing grooves, and all the labyrinth cavities form a multi-stage labyrinth cavity structure; the sealing piece is further provided with oil return holes, oil discharge holes, a balance cavity and a balance hole, the oil return holes extend in the labyrinth cavities in a one-to-one correspondence mode, the oil discharge holes are communicated with one or more oil return holes, and the balance cavity is communicated with the atmosphere through the balance hole. According to the utility model, the sealing reliability is improved.

The rigidity valve comprises a coil component, a mandrel, a sealing component, a valve seat, core iron and a sealing head component, the core iron and the sealing head component are matched, the two ends of the mandrel are connected with the core iron and the sealing component respectively, a valve port is formed in the valve seat, and the sealing component is used for opening and closing the valve port; the end socket part comprises an end socket part and a fixing seat, the end socket part comprises a through hole penetrating in the axial direction, the mandrel penetrates through the through hole, and the end socket part is fixedly connected with the fixing seat or is in limiting connection with the fixing seat in the axial direction; at least part of the core iron and at least part of the end socket part are distributed in an inner hole of the coil component in the axial direction, and the fixing seat is located between the coil component and the valve seat in the axial direction. The seal head part of the rigidity valve is relatively simple to process and relatively low in processing cost.

The utility model provides a flange structure convenient to disassemble. According to the technical scheme, the flange structure comprises a first flange plate and a second flange plate; the first flange plate is fixedly arranged, and the second flange plate is detachably arranged on the first flange plate; the second flange plate is provided with a middle hole; the second flange plate further comprises a connecting pipe coaxial with the middle hole. The connecting pipe is in threaded connection with the first flange plate; a fixing assembly is arranged on the connecting pipe; the fixing assembly is detachably connected with the first flange plate, and the fixing assembly comprises a plurality of connecting rods axially distributed on the peripheral surface of the connecting pipe; one end of the connecting rod is integrated with the peripheral surface of the connecting pipe, and the other end is provided with an inclined surface; the flange structure convenient to disassemble has the beneficial effects that compared with the prior art, the flange structure convenient to disassemble has the beneficial effects of being convenient to disassemble, firm in connection and stable in supporting.

The utility model discloses a novel vibrating circular screen which comprises a vibrating circular screen body, a rotating mechanism and a screen mesh are arranged in the vibrating circular screen body, the rotating mechanism comprises a rotating shaft and a stirring paddle, the rotating shaft is distributed in the axial direction of the vibrating circular screen body, and the stirring paddle is fixedly connected to the periphery of the rotating shaft; rolling grooves are formed in the inner walls of the two axial ends of the vibration circular screen body, and the screen cloth is rotationally connected into the rolling grooves. The stirring paddle comprises a connecting rod, a spring and a first collision block, one end of the connecting rod is fixedly connected with the rotating shaft, the other end of the rotating shaft is fixedly connected with one end of the spring, and the other end of the spring is fixedly connected with the first collision block; a second collision block is fixedly connected to the inner wall of the screen, and the first collision block and the second collision block are located on the same arc. The stirring paddle can be driven to rotate through the rotating mechanism, materials are pushed to be evenly dispersed and pass through the screen, and the screening efficiency is improved.

The invention discloses a compressor and refrigeration equipment, and relates to the technical field of compressors, and the compressor comprises a motor and an air cylinder; the motor comprises a stator core and a winding, the winding is arranged on the stator core, the maximum outer diameter of the stator core is D1, the axial length of the stator core along the compressor is L, the air cylinder and the stator core are distributed along the axial direction, the height of the air cylinder in the axial direction is H, the inner diameter of the air cylinder is D2, and the following conditions are met: U is the maximum voltage of the compressor, the unit is V, B is the gauge pressure of the compressor, the unit is MPa, and D is the maximum voltage of the compressor. And the unit of D1, L, D2 and H is mm. According to the technical scheme, the magnetic load capacity of the stator core is matched with the mechanical load of the compressor, material waste is avoided, and the energy efficiency of the compressor is guaranteed.

The utility model belongs to the technical field of testing, and particularly relates to a tool for rapidly detecting the precision of a cone shaft. The measuring tool comprises a measuring tool body which is provided with a conical detection channel matched with a conical shaft, air inlet channels are distributed on the inner wall of the measuring tool body, and the measuring tool body is communicated with an external air pressure source; the movable sliding block abuts against the end face of the conical shaft. The dial indicator detects the displacement of the slider; the axially distributed air outlet channels are externally connected with an air pressure numerical meter; and the warning device is electrically connected with the air pressure value meter. A guide sliding rail is arranged on the outer side of the measuring tool body, four air inlet channels and four air outlet channels are correspondingly installed, and the warning device comprises a red light and a buzzer. The beneficial effects are that the device directly reads dimensional deviation through the dial indicator, feeds back roughness and dimensional precision through the air pressure system, simulates an actual installation contact state, realizes full-size section detection, gives an alarm in real time through the warning device, improves the detection efficiency, is suitable for online detection of various cone shafts, is especially suitable for batch production scenes, rapidly screens unqualified products, and improves the detection efficiency. And the high-precision detection requirement is met.

The utility model provides a positioning device in a main shaft, and belongs to the technical field of machinery. The chuck solves the problem that an existing chuck is poor in clamping stability of long shaft parts. The positioning device in the main shaft comprises a chuck main body with a through hole in the center and a tubular pull tube fixed in the through hole of the chuck main body, and further comprises a barrel-shaped positioning piece, and the closed end of the positioning piece is arranged in the pull tube in a penetrating mode. A plurality of sealing rings are fixed to the outer side of the closed end of the positioning piece, the outer sides of the sealing rings tightly abut against the inner wall of the pull pipe, the open end of the positioning piece stretches out of the pull pipe and is fixed to the chuck body, the inner end face of the closed end of the positioning piece is a plane, a filling pipe and a lining pipe which are both in a circular pipe shape are arranged in the positioning piece in a penetrating mode, and the lining pipe is made of metal materials. The filling pipe and the liner pipe are coaxially arranged and distributed in the axial direction of the positioning piece, and the filling pipe and the liner pipe are both in close fit with the positioning piece. The main shaft inner positioning device has the advantage of being good in clamping stability.

The application provides a well completion string, a well completion method and an injection-production system, the well completion string comprising a production casing and a well completion assembly connected to one end of the production casing, the production casing comprising one or more limiting splices, the multiple limiting splices being distributed along the axial direction of the production casing, a limiting part being arranged on the inner wall of the limiting splices, the limiting part being convex relative to the inner wall of the main body of the production casing; the limiting part is used for cooperating with a blowout plug to carry out blowout control, and / or is used for cooperating with a sealing plug at the bottom of a central pipe string lowered into the production casing to carry out string limiting. According to the technical scheme of the application, the limiting splices are designed in the production casing of the well completion string, the limiting part of the limiting splices can cooperate with the blowout plug to carry out blowout control or cooperate with the central pipe string lowered into the production casing to realize the setting of the string, stable blowout control can be realized under the condition that the well bottom is under pressure, and the setting of the central pipe string without packers can be realized, which provides favorable conditions for corresponding injection-production operations.

The invention relates to a stator core, a stator assembly, a motor, a suspension system and a vehicle. The stator core comprises a plurality of stator teeth distributed along the axial direction of the stator core, and stator slots are formed among the plurality of stator teeth. Each stator slot comprises a slot main body part and a slot opening part which are arranged along the radial direction of the stator iron core. The slot body portion has a first central axis, and the slot opening portion has a second central axis. The second central axis of the stator slot is parallel to the first central axis, and the offset distance of the second central axis along the axial direction of the stator core relative to the first central axis is P. The size of the slot main body part along the axial direction of the stator core is W1. P and W1 satisfy the formula 0 < P / W1 < = 0.09. By means of the arrangement, thrust fluctuation caused by magnetic resistance when the motor works is reduced, and then vibration and noise generated when the motor works are reduced.

To provide a method for calculating a nuclear constant in consideration of an influence of a heterogeneous medium in a core axial direction.SOLUTION: The calculation method is a calculation method executed by a computer, and includes calculating a first neutron flux distribution in an axial direction of a reactor core by three-dimensional non-homogeneous single assembly calculation, and calculating a second neutron flux distribution in the axial direction of the reactor core by three-dimensional homogeneous single assembly calculation. A step of calculating a second neutron flux distribution in the axial direction of the core, a step of calculating an axial distribution of a correction factor such that a reaction rate based on the first neutron flux distribution can be reproduced by a three dimensional homogeneous single cluster calculation to which a correction factor of a nuclear constant based on a ratio between the first neutron flux and the second neutron flux is applied; The method includes a step of updating the second neutron flux distribution, a step of calculating the axial distribution of the correction factor until the correction factor converges, and a step of repeating the step of updating the second neutron flux distribution.SELECTED DRAWING: Figure 1

The unreeling machine with the rapid feeding function comprises a machine body provided with an unreeling shaft, the machine body is provided with a moving trolley in a horizontal moving mode, and a supporting mechanism is arranged on the top of the moving trolley in a lifting mode. The supporting mechanism comprises a bottom plate and a plurality of supporting rollers distributed in the axial direction of the unwinding shaft, the supporting rollers are arranged over the bottom plate at equal intervals in the direction perpendicular to the axial direction of the supporting rollers, and the two ends of each supporting roller are connected with the bottom plate through elastic connecting pieces. A coiled material is placed on the supporting mechanism and transported to the position of the unwinding shaft through the moving trolley, the supporting mechanism ascends and descends to enable the coiled material and the unwinding shaft to be installed in a butt joint mode, and the supporting mechanism stays below the coiled material for supporting; compared with an additional supporting device for supporting the unwinding shaft, the supporting device has the advantages that the winding and unwinding time of the supporting device and the resetting time of the moving trolley are saved while the stable supporting effect on the coiled materials is achieved, and the feeding efficiency of the unwinding machine is improved; and the supporting rollers are arranged to reduce the resistance of the coiled material during uncoiling so as to reduce the load of equipment.