199 results about "Central symmetry" patented technology

The invention discloses a regional prediction method for a wind power coefficient of a large reflecting surface based on a neural network. The method comprises the following steps: generating a wind power cloud picture according to resistance, lateral force and lift force of an antenna reflecting surface corresponding to a pitching angle and an azimuth angle under different working conditions; the method comprises the following steps: importing a wind power cloud picture into MATLAB: dividing an antenna reflecting surface according to the central symmetry and central stiffness distribution characteristics of the antenna reflecting surface to obtain circular ring partitions; dividing the wind power cloud picture of the near area of the antenna reflecting surface along the Z-axis direction of the YOZ plane according to the wind speed gradient to obtain Z-axis partitions; calculating a wind power coefficient of a region determined by the Z-axis partition and the circular ring partition; inputting the pitching angle and the azimuth angle under different working conditions and the wind power coefficient of each area as training data into a prediction network for training to obtain a trained prediction network; and inputting the pitching angle and the azimuth angle to be tested under different working conditions into the trained prediction network, and outputting the predicted wind power coefficient of the reflecting surface. The precision of wind power analysis is improved.

The invention relates to a plate three-point incremental forming track designing and forming method. The method comprises the following steps that S100, a two-point incremental forming track is generated according to a three-dimensional model of a target part; s200, the track is divided into two areas, the two parts of the track are achieved through two forming tools (2 and 3) respectively, and the connecting line of cutter location points of the two forming tools at the same moment always passes through the same central symmetry axis; s300, a simple support (7) is installed, the periphery of the plate (8) is clamped, a forming tool is installed, and tool setting is conducted; s400, pre-stretching is applied to the plate, and then the two execution tail ends of the machining equipment are made to run according to the tracks of the two forming tools correspondingly to machine the plate; and S500, after machining is completed, the clamping force is removed, and the formed workpiece is taken down. Three-point constraint is formed on the plate through the simple support and the two forming tools, the overall deflection and shaking of the plate during forming are remarkably reduced, and then the geometric accuracy of a final part is improved.

The invention discloses a mixed star-shaped mechanical metamaterial unit and a metamaterial structure, and relates to the technical field of metamaterial structures, the mixed star-shaped mechanical metamaterial unit comprises a concave polygonal honeycomb structure which is of a central symmetry structure and is provided with a long edge and short edges which are bent inwards, and two ends of the long edge are respectively connected with one ends of the two short edges to form a closed structure; the two concave polygonal honeycomb structures are respectively arranged along an X axis and a Y axis and have the same symmetric center, and the long sides of the two concave polygonal honeycomb structures define a star-shaped structure by taking the symmetric center as a base point; the short edge is bent inwards to form a mounting part matched with the vibration reduction assembly in shape, and the vibration reduction assembly is arranged on the mounting part; the straight line where the two ends of the short edge are located is a base line. The outer edge of the damping assembly is located outside the base line. Each mixed star-shaped mechanical metamaterial unit is composed of two inwards-concave polygonal honeycomb structures and a vibration reduction assembly, and has the large-load bearing capacity and the vibration isolation function.

The invention discloses a holosymmetric four-mass MEMS gyroscope which comprises four sensitive mass block coupling structures which are arranged in a central symmetry manner, and four first U-shaped beams, four n-shaped beams and a cross-shaped coupling structure which are arranged in a central symmetry manner and are connected with the four sensitive mass block coupling structures, compared with the prior art, the four sensitive mass block coupling structures are designed compactly and symmetrically, so that the sensitivity can be effectively improved, and thermally induced drift can be effectively reduced. The driving mode and the working mode are separated through the specific coupling mechanism, so that frequency coupling is avoided, and environmental vibration interference is reduced. And meanwhile, the symmetry of the structure is beneficial to uniform distribution of thermal stress or mechanical stress, so that zero drift caused by temperature change is inhibited.

The utility model discloses a medium-speed diesel engine roller guide cylinder lining installation tool which comprises a guide shaft, two guide flat keys, a punching sleeve and a lower supporting seat, and the guide flat keys are fixed in key grooves of the guide shaft. A guide gap delta is reserved between the inner hole of the punching sleeve and the outer circle of the guide shaft; the lower supporting base is in an inverted-flat-bottom V shape, and the center of the top of the lower supporting base extends upwards to form a positioning block. The inner sides of the two bevel edges of the inverted flat-bottomed V-shaped lower supporting seat abut against base circles of corresponding cams of the cam shaft respectively, the guide shaft is inserted into a corresponding roller guide cylinder hole of the rack, the central symmetry plane of the key groove is parallel to the axis of the cam shaft, the positioning block is embedded into a central positioning groove in the bottom of the guide shaft, and the bottom of the guide shaft abuts against the top face of the lower supporting seat. The roller guide cylinder bushing mounting device is simple in structure, the mounting difficulty of the roller guide cylinder bushing is remarkably reduced, and the mounting quality and the mounting efficiency of the roller guide cylinder bushing are improved.

The invention relates to a die bonding swing arm device which comprises a main shaft rotating motor which is fixed on a base below, and the output end of the bottom of the main shaft rotating motor is connected with a rotating main shaft which can rotate around a vertical axis; the two independent lifting modules are symmetrically and fixedly mounted on the left side and the right side of the rotating main shaft by taking the axis of the rotating main shaft as a symmetric center; and the two swing arm assemblies are installed on the swing arm fixing bases of the two lifting modules correspondingly, and a suction cup is installed at the tail end of each swing arm assembly. According to the double-swing-arm alternating parallel operation mode, crystal taking and crystal fixing actions are almost synchronously carried out, the theoretical carrying efficiency is nearly doubled compared with that of a single swing arm, and the equipment productivity is greatly improved.

The utility model belongs to the technical field of scanners, and discloses a tracking type scanner. The tracking type scanner comprises marking modules, each marking module comprises a first marking part and a second marking part, the multiple first marking parts are sequentially and annularly arranged along the periphery of a first shaft, the first marking parts are obliquely arranged relative to the first shaft, and the second marking parts are arranged in an annular area defined by the multiple first marking parts; the center of the second marking part and the first shaft are arranged in a staggered mode, and / or a preset angle is formed between the axis of the second marking part and the first shaft, and the preset angle is not equal to 0. According to the utility model, the problems that in the prior art, due to the fact that the marking modules are distributed in a central symmetry mode, identification errors of the marking point modules are possibly caused, and errors of judgment from a certain marking point to another marking point module are possibly caused can be solved, and the identification accuracy is improved.

The invention provides a mask and an overlay error measurement method, and relates to the technical field of detection. The mask plate comprises a test pattern structure arranged in the middle area of the mask plate, the test pattern structure is used for forming an overlay mark on a wafer, and the test pattern structure comprises a first overlay pattern group, a first reference pattern group, a second overlay pattern group and a second reference pattern group which are sequentially arranged in the circumferential direction of a rotation center, the first reference pattern group and the second reference pattern group are of a central symmetry structure, and marks, mapped on the wafer, of the first overlay pattern group and the second overlay pattern group are arranged in a mutually offset mode and do not coincide with the marks, mapped on the wafer, of the first reference pattern group and the second reference pattern group. According to the invention, a plurality of different pattern groups are integrated on a single mask plate at the same time, and three overlay layer marks can be directly formed in the quadrant region corresponding to the wafer, so that more effective overlay mark image information is obtained, and the detection precision of the overlay error is improved.

The invention relates to an aircraft which is arranged in a central symmetry mode in the axial direction and comprises a first driving system and a second driving system used for driving the aircraft to move horizontally. The first driving system comprises two driving motors which are coaxially arranged and two groups of wind wings which are arranged in a conjugate manner; coaxial cavities are respectively formed in the two driving motors; the two sets of wind wings are arranged in the circumferential directions of rotors of the two driving motors correspondingly. The second driving system is arranged on the first driving system in the axial direction; the ratio of the outer diameter of the driving motor to the axial length of the driving motor is larger than or equal to 10 and smaller than or equal to 300. According to the invention, the navigation stability of the aircraft can be improved.

This invention discloses a method for fitting the geometric center of a centrally symmetric image, comprising: S1, constructing a pixel coordinate system based on the original image and obtaining the pixel coordinates of the edges of the centrally symmetric image on the original image; S2, selecting the two edge pixels with the largest distance from all edge pixels, and taking the midpoint between the two edge pixels with the largest distance as a temporary center point; S3, constructing a virtual pixel matrix in the area surrounding the temporary center point, and selecting the virtual pixel with the smallest sum of distances to all edge pixels as a new temporary center point; S4, repeating step S3 until the fitting accuracy of the temporary center point meets the design requirements. This invention directly fits the geometric center of a graphic based on the geometric characteristics of a centrally symmetric image. The calculation process is simple and direct, and it is widely applicable to the geometric center fitting of all centrally symmetric images. At the same time, the multi-step fitting and multiple iteration methods fully ensure the fitting accuracy.

The invention provides an automatic tool clamp for grinding a crankshaft through floating clamping and precise positioning, and belongs to the field of grinding clamps. The problems that an original crankshaft grinding clamp is high in precision requirement and poor in adjusting capacity are solved. Comprising a clamp body, a positioning cone, a spring jacket, a headstock center, a tailstock center, a crankshaft workpiece, a positioning screw, a positioning ejector pin, an oil cylinder and a machine tool headstock spindle, the clamp body is connected with the machine tool headstock spindle, and the oil cylinder in the clamp body is communicated with an oil way in a machine tool headstock; the oil cylinder is connected with a spring clamping sleeve in the clamp through a rotary buckle, and can push the spring clamping sleeve to carry out precession in the direction of a main shaft of a machine tool and clamp the crankshaft workpiece to be machined; the clamping end of the spring jacket is composed of four parts which are centrosymmetric, and a space is reserved for clamping action and positioning of the ejector pin; the machine tool headstock center and the machine tool tailstock center abut against the crankshaft workpiece to be machined at the two ends respectively, and the machine tool headstock center penetrates through the spring jacket along a center hole of the spring jacket; the tail end of a positioning ejector pin in the clamp is a hemispheroid, and the hemispheroid penetrates through the notch in the outer circle of the spring clamping sleeve and abuts against the tooth face of the crankshaft to be machined in the opposite direction.

The utility model relates to the technical field of veneer reeling machines, and discloses a veneer reeling machine high-precision roller positioning device which comprises a veneer reeling machine body, a base, an adjusting mechanism, a material taking mechanism and an encoder. The first guide rods are symmetrically arranged relative to the center of the first lead screw, the first sliding block is in threaded connection with the outer side of the first lead screw, and the mounting plate is fixedly mounted on the side, close to the plate rolling machine body, of the first sliding block. The first motor drives the first lead screw to rotate so as to drive the sliding block to move longitudinally, then the sliding block and the mounting plate are used in cooperation so as to drive the working roller to move longitudinally, the first lead screw is connected with the encoder through the elastic coupler, and the encoder measures the rotation of the first lead screw so as to adjust the position of the working roller. Therefore, the longitudinal displacement distance of the working roll driven by the first sliding block can be accurately calculated, and high-precision adjustment of the working roll is achieved.

The utility model discloses an open-close type annular coil for electromagnetic pulse, which comprises two semicircular annular coils which are arranged in a central symmetry manner, two ends of each annular coil are provided with ports which are connected into or out of an external power supply platform, and the connected ports of the two annular coils are not adjacent to each other. Each annular coil is arranged on the corresponding insulating ring, and the opposite faces of the two insulating rings are provided with inserting structures capable of achieving combination of the insulating rings. The whole processing is simple, the production is easy, the mechanical strength is high, the service life is long, and the switching of the opening and closing states of the coil can be quickly realized during welding, so that the problem of processing limitation of the traditional closing coil is solved.

The utility model discloses a work fixture for processing shaft body parts, which comprises a frame body movably connected with a shell. A turntable is rotationally connected in the shell; a plurality of arc-shaped grooves are formed in the turntable; the arc-shaped grooves are arranged in a central symmetry mode, and the inner sides of the arc-shaped grooves incline towards the outer sides. A connecting rod is connected in the arc-shaped groove; the lower end of the rotating disc is fixedly connected with a limiting plate matched with the arc-shaped groove. A limiting groove communicated with the arc-shaped groove is formed in the upper end of the limiting plate; a moving rod is connected to the limiting groove in a sliding manner; the lower end of the connecting rod is fixedly connected with the moving rod; the moving rod is driven by the connecting rod to move in the limiting groove; the end, located on the outer side, of the movable rod penetrates through the limiting plate and is connected with an abutting rod. The rotating disc with the arc-shaped groove is arranged in the shell, and the limiting plate is arranged at the lower end of the rotating disc, so that the connecting rod drives the connecting rod and the moving rod at the lower end to move towards the inner side and the outer side at the same time for abutting and clamping.

The utility model provides a torque loading device of a torque sensor, and relates to the field of loading calibration. The device mainly comprises a loading part, a bracket and a base. The two loading blocks are distributed on the two sides of the loading rod in a central symmetry mode, a load F is applied to one loading block, and quasi-static force loads F'which are opposite in direction and approximately equal in size can be generated on the other side of the loading rod. The loading head can simulate a working condition that a loading head of a standard loading table applies a load F to an object, and a proper loading head can be selected according to different working conditions of the loading table. The problem that the quasi-static calibration table can only be loaded in a single direction is solved, so that the quasi-static torque is obtained. The method can be applied to scenes requiring torque loading.

The utility model provides a novel combined type sliding block pull rod mechanism which comprises two sets of driving assemblies arranged in a central symmetry mode, each driving assembly comprises a sliding block base, an inclined guide column, a first sliding block and a second sliding block, and the first sliding block and the second sliding block are connected with the outer side end of a first half module and the outer side end of a second half module respectively. One end of the pull rod is fixedly connected with the sliding block seat, and the other end of the pull rod is connected with the second sliding block of the driving assembly on the other side. Through linkage arrangement of the pull rod, the second sliding block of the other driving assembly can be driven to move at the same time, linkage can be achieved by controlling the two sliding block bases to move face to face or relative to each other so as to drive the two modules to open or close, the cavities in the modules are transversely arranged, the overall structure is compact, the size is small, and the working efficiency is high.

The utility model belongs to the technical field of pipeline installation, and particularly relates to a pipeline installation regulator which comprises a base with the semicircular inner surface and opening and closing seats connected to the two ends of the base, the opening and closing seats are rotationally connected with the base through rotating pins, and a circular installation groove for fixing a pipeline is defined by the base and the inner surfaces of the two opening and closing seats. The fixed end of the opening and closing control structure is installed on the base, the power end of the opening and closing control structure is connected with the rotating pin, and the opening and closing control structure is used for controlling the opening and closing base to rotate inwards or outwards to clamp or loosen the pipeline; the two locking teeth are symmetrically arranged on the inner surface of the base, one locking tooth is arranged on the inner surface of each opening and closing seat, and the four locking teeth are distributed in a central symmetry mode; and one propelling structure is arranged corresponding to each locking tooth. After being applied to pipeline mounting operation, the device can avoid errors between pipeline preformed holes, reduces pipeline mounting difficulty, and meanwhile can be quickly adapted to mounting of pipelines with different pipe diameters.

The invention provides a Hall memristor based on an aged insulator and storage and calculation integrated computing equipment, and the method comprises the steps: firstly, through symmetry engineering design, employing a quasi-two-dimensional aged insulator which breaks the central symmetry and rotational symmetry, supporting a quantum abnormal Hall state at the same time, and generating track magnetization and the coupling of an in-plane electric field and out-of-plane magnetization; secondly, a quantum geometric mechanism is introduced into the quantum Hall state without the Fermi surface, intrinsic track magnetoelectric coupling is achieved, and the dependence of a traditional mechanism on the Fermi surface is broken through; and the domain wall is directly driven by the in-plane electric field to move to realize magnetization overturning, so that the participation of body current is avoided, and the energy consumption is remarkably reduced. And finally, the device combines the overturning of the magnetic state with the hysteresis behavior of the Hall resistor, and the inherent non-volatility and memory characteristics of the device provide a key device basis for constructing novel calculation hardware integrating storage and calculation.

The utility model belongs to the technical field of HWS static pressure molding method casting, and discloses a brake drum one-mold four-piece HWS static pressure molding casting device which comprises four brake drum models, a pouring cup, a straight pouring gate, four transverse pouring gates and eight inner pouring gates, the upper end of the straight pouring gate is communicated with the pouring cup, the four transverse pouring gates are arranged in a cross mode, and the inner pouring gates are communicated with the pouring cup. The four brake drum models are arranged in a central symmetry mode, the symmetry center is a central intersection point of four cross gates which are crossed, the central intersection point is communicated with the lower end of the straight gate, each cross gate is communicated with two inner gates, and the two ends of each inner gate are respectively communicated with one brake drum model. According to the utility model, the casting production of four brake drums in one mold is realized, the yield of more than 90% can be realized, the utilization efficiency of materials in the casting process is obviously improved, the production efficiency of brake drum castings is greatly improved, the production cost of the brake drum castings is effectively reduced, and the brake drum casting mold has obvious technical advantages and process advancement.

The utility model relates to a wheel set capable of adjusting the length of a main chord of a composite bow, which belongs to the technical field of adjustment of the main chord of the composite bow and comprises a wheel set, two groups of parallel bowstring grooves used for winding of the main chord are arranged on the wheel set, an adjusting frame fixedly connected is arranged on the wheel set, and fixing columns fixedly connected are symmetrically arranged on the center of the adjusting frame. The fixing column is close to the starting end of the bowstring groove, a main string adjusting module used for adjusting the tension degree of the main string is arranged on the fixing column, a plurality of adjusting holes used for fixing the main string adjusting module are evenly formed in the outer edge of the adjusting frame, and the two ends of the main string are connected with the main string adjusting modules on the two wheel sets arranged on the same side in a mirror image mode respectively. The rotation angle of the main chord adjusting module on the fixing column on the adjusting frame is adjusted, the tensioning degree of the two ends of the main chord is fixedly adjusted through the adjusting holes, the deviation problem of four included angles of the bead base fixed to the main chord is adjusted, it is guaranteed that the distances between the four included angles of the bead base and the main chord adjusting module are the same, and therefore accurate shooting is guaranteed.

The utility model aims to solve the problems of complex process, high cost and unstable distortion control effect in the heat treatment process of a gear shaft in the prior art, and provides a heat-resistant tool for heat treatment of a duplicate gear shaft. The two partition plates are arranged on the upper end wall and the lower end wall of the rectangular frame in a central symmetry mode respectively, and the two partition plates are fixedly connected through a connecting plate and are parallel to the long side wall of the rectangular frame. One group of fixing plates is vertically connected between one partition plate and one longer side wall of the rectangular frame, and the other group of fixing plates is vertically connected between the other partition plate and the other longer side wall of the rectangular frame; a gap is formed between the two fixing plates included in each group of fixing plates, a first arc-shaped clamping groove is formed in the upper edge of one longer side wall of the rectangular frame located between the gaps, and a second arc-shaped clamping groove corresponding to the first arc-shaped clamping groove is formed in the upper edge of the other longer side wall of the rectangular frame located between the gaps; supporting structures are arranged at the two ends of the two long side walls in the rectangular frame.

The utility model belongs to the technical field of crane equipment, and relates to a crane track connecting device which comprises a body and a stop plate, the body is of an integrated central symmetry structure, a left notch and a right notch are formed in the two ends of the body respectively, a left guide arm is connected to an opening in one side of the left notch, and a right guide arm is connected to an opening in one side of the right notch. The left notch and the left guide arm are used for being fixedly connected with a first track to be connected, the right notch and the right guide arm are used for being fixedly connected with a second track to be connected, a key groove is formed in the bottom of the body, and the stop plate is arranged in the key groove. The left notch, the right notch, the left guide arm and the right guide arm are connected with the first rail and the second rail to be connected, the structure is simple, practicability is high, and maintenance is convenient; the stop plate and the crane beam are welded into a whole, so that the track can be effectively fixed on the crane beam, and the track does not move disorderly; through bolt holes used for connection of high-strength bolts and nuts are formed by combining round holes and long-strip-shaped holes, and the expansion joint can be kept within a reasonable range all the time.

This invention discloses a frame decoupling structure and a MEMS resonant gyroscope incorporating it, belonging to the field of microelectromechanical systems (MEMS) technology. The frame decoupling structure is a centrally symmetric structure, comprising a drive decoupling frame and a detection decoupling frame. The drive decoupling frame is connected to a fixed anchor point via a first elastic support structure with low stiffness in the drive direction and high stiffness in the detection direction, and is connected to a mass block via a second elastic support structure with high stiffness in the drive direction and low stiffness in the detection direction. The detection decoupling frame is connected to the fixed anchor point via a third elastic support structure with low stiffness in the detection direction and high stiffness in the drive direction, and is connected to the mass block via a fourth elastic support structure with high stiffness in the detection direction and low stiffness in the drive direction. This design physically separates the mechanical paths of drive and detection using anisotropic stiffness beams, thereby effectively suppressing orthogonality errors and improving the gyroscope's performance and production yield.

The utility model discloses a rubber neatening and receiving mechanism, which belongs to the technical field of rubber receiving devices and comprises a mounting component, a translation receiving guide component, a driving component and an adjusting guide neatening component. The number of the translation material receiving guide assemblies is two, and each translation material receiving guide assembly comprises a translation material receiving assembly and a guide assembly; the two translation material collecting assemblies are arranged in a central symmetry mode, and the two guide assemblies are arranged on the mounting assembly in a bilateral symmetry mode; the translation receiving assembly is connected with the guide assembly; the driving assembly is mounted on the mounting assembly, and the driving assembly is connected with the translation receiving assembly; and the adjusting, guiding and arranging assembly is mounted on the mounting assembly. By means of the mode, double-station alternate collection is achieved, and therefore the material collecting efficiency is improved.

An opening and closing clamping mechanism is arranged on a testing fixture and comprises a fixed seat, a rotating shaft, two opening and closing blocks and two positioning zero stickers, and the fixed seat is provided with at least one guide rod along the horizontal direction; the rotating shaft is vertically arranged on the fixing seat, a transmission disc is arranged at the upper end of the rotating shaft and can be driven by the rotating shaft to rotate, part of the transmission disc protrudes out of the two side faces of the fixing seat, two eccentric grooves which are arranged in a central symmetry mode are formed in the transmission disc, and a driving piece is connected to the lower end of the rotating shaft and used for driving the rotating shaft to rotate along the axis of the rotating shaft. The two opening and closing blocks are symmetrically arranged on the two sides of the fixing base in the extending direction of the guide rod, the opening and closing blocks are in sliding connection with the guide rod, limiting columns are arranged on the opening and closing blocks, the limiting columns penetrate into the eccentric grooves, and the limiting columns can relatively move along the extending tracks of the eccentric grooves so as to drive the two opening and closing blocks to synchronously move in the opposite directions or in the opposite directions; and the two positioning zero stickers are symmetrically mounted at the end parts of the two opening and closing blocks, and are provided with positioning supporting surfaces.

The utility model relates to the technical field of propeller machining, in particular to a support structure for assisting a propeller in overturning. Comprising a vertical rod, lifting holes are formed in the positions, close to the two ends, of the side wall of the vertical rod, two limiting assemblies are symmetrically arranged at the position, between the two lifting holes, of the vertical rod, and each limiting assembly comprises a moving sleeve and a cushion sleeve which are arranged on the vertical rod in a sliding and sleeving mode; the cushion cover is fixedly arranged on the side, close to the middle position of the vertical rod, of the movable sleeve through a bolt, and two involution grooves are formed in the movable sleeve in a central symmetry mode. According to the utility model, after the movable sleeve and the cushion sleeve are sleeved on the vertical rod, a worker inserts and fixes the clamping blocks on the movable sleeve into the corresponding clamping grooves through the displacement mechanism, so that the movable sleeve and the cushion sleeve can be fixed on the vertical rod; and the situation that the movable sleeve cannot be used due to the fact that a thread groove in the movable sleeve slips is avoided, and the service life of the support is prolonged.

The invention discloses an installation and adjustment auxiliary system and method for an optical mirror surface supporting system. The system comprises a substitute mirror and force / torque sensing units, the substitute mirror is a metal body which is equivalent to an optical mirror surface in geometric dimension and mass, a force / torque sensing unit is arranged at each supporting point, corresponding to the optical mirror surface, of the substitute mirror, and each force / torque sensing unit comprises a plurality of force sensors which are identical in structure and are distributed in a central symmetry mode. The force sensor can measure force and torque at the same time, is supported and fixed through the force sensor fixing seat, and is connected with the optical mirror surface through the supporting system connecting plate. Before the optical mirror surface is installed and debugged, the substitute mirror can be used for installing and debugging, the actual stress condition of each supporting point of the mirror surface supporting system is reflected in real time, the abnormal stress point is detected, a direct monitoring means for the stress layer is provided, the fault diagnosis and correction speed is accelerated, the supporting force and the torque can be detected in real time, and the fault diagnosis and correction accuracy is improved. Therefore, assembly and adjustment are assisted.

The utility model relates to the technical field of hose pumps, in particular to a hose pump which comprises a pump shell and a hose, two hose inlets and outlets are formed in the side portion of the pump shell, and the hose inlets and outlets are fixedly connected with a connecting frame. The connecting frame comprises a hose flange connected with a hose, and the hose flange is fixedly connected with a bottom plate through a support. The bottom plate is connected with the hose inlet and outlet through bolts; a center hole is formed in the center of the bottom plate; two arc-shaped kidney-shaped holes which are in central symmetry relative to the center O point of the bottom plate are formed in the bottom plate, and the center lines of the two arc-shaped kidney-shaped holes are located on the same circle with the O point as the circle center. The central angle of the arc-shaped kidney-shaped hole is larger than or equal to 90 degrees. The bolt is located in the arc kidney-shaped hole. Two bolts are arranged in each arc-shaped kidney-shaped hole, and the bolts abut against the ends of the arc-shaped kidney-shaped holes. In the horizontal plane where the point O is located, the included angle between the center of the bolts at the two ends of the arc-shaped kidney-shaped hole and the connecting line of the point O is 90 degrees; according to the utility model, the hose can be ensured to realize accurate 90-degree rotation.

The utility model belongs to the field of tires, and particularly relates to a crown pattern ring belt, a central pattern ring belt and a tread pattern. A tread pattern comprises four pattern grooves arranged along the circumferential direction of a tread, and the pattern grooves divide the tread into tire shoulder pattern ring belts positioned on two sides of the tread, a central pattern ring belt positioned in the middle of the tread and tire crown pattern ring belts positioned on two sides of the central pattern ring belt; the two crown pattern ring belts are in central symmetry, and each crown pattern ring belt comprises a plurality of parallel broken lines ABCD and a plurality of parallel broken lines BEGC; the central pattern ring belt comprises a plurality of mutually parallel broken lines ABCD and mutually parallel broken lines BEGC; special grooves are designed in the patterns, and the grooves with different depths reduce the transverse deformation when the tire is in contact with the ground, so that the energy loss in the rolling process is reduced, and the rolling resistance of the tire is relatively small; meanwhile, the design of the grooves increases the saturation degree of the patterns, so that the driving mileage is prolonged.

The angle-adjustable hub cap fin comprises a hub cap body, fins and cylindrical bases, the hub cap body is of a gyro-shaped structure, the cylindrical bases are rotatably installed on the circumferential outer wall of the hub cap body and are of a central symmetry structure, the fins are rotatably installed on the cylindrical bases, and the fins are arranged on the cylindrical bases in a centrosymmetric mode. And a rotating mechanism for controlling the cylindrical base to rotate is arranged in the hub cap body. The hub cap fin has the two-stage adjusting function, namely, the overall adjusting function of the fin installation angle is achieved, the independent adjusting and locking function of the inclination angle of each fin is achieved, the hub cap fin can accurately adapt to different navigation working conditions of an aircraft or a surface ship, and the energy-saving efficiency is the highest.