868 results about "Suction surface" patented technology

An airfoil is provided that includes a first end, a second end, a leading edge, a trailing edge, a pressure side and a suction side. The leading edge and the trailing edge are joined by the pressure side and the suction side to provide an exterior airfoil surface extending in a spanwise direction from the first end of the airfoil to the second end of the airfoil. The exterior airfoil surface are formed in conformance with a plurality of cross-section profiles of the airfoil described by a set of Cartesian coordinates set forth in Table 1. The Cartesian coordinates are provided by an axial coordinate scaled by a local axial chord, a circumferential coordinate scaled by the local axial chord, and a span location. The local axial chord corresponds to a width of the airfoil between the leading edge and the trailing edge at the span location.

The invention relates to the technical field of grabbing manipulators, and discloses a self-adaptive grabbing device for a special-shaped curved surface workpiece, which comprises a central bearing base made of a light metal material and provided with a multifunctional quick connector at the top; the central adsorption module is fixed at the central position of the bottom of the central bearing base and comprises an air pressure balance pipeline communicated with an external air source; by means of radial adjustment of the cross shaft and cooperation of the elastic buffering structure and the vertical guiding assembly, high-precision centering and stable adsorption are achieved, vertical contact of the suction cup is ensured through vertical guiding, the suction cup is suitable for different curved surface radians, and the stable adsorption force under the small area is kept; and electric control connection supports installation, namely electrification, and is suitable for automatic precise grabbing.

Disclosed is a negative pressure suction-based fixing device comprising a housing, a suction and holding member, a negative pressure creating assembly and a sealing member. The housing has an accommodating cavity thereinside. The suction and holding member has an abutting and holding surface recessed to form a suction cavity communicated with the accommodating cavity. The abutting and holding surface has a mounting structure connected to the sealing member, so that the sealing member is arranged on the abutting and holding surface for abutting against the suction surface. The sealing member can be elastically deformed to fit with the suction surface so as form an enclosed space together with the cooperation of the suction cavity and the suction surface. In this way, it is difficult for the negative pressure suction-based fixing device to fall off from a rough surface.

The invention discloses a method for rapidly predicting and dynamically regulating and controlling the quality of a flow field of a gas compressor under a low Reynolds number. According to the method, firstly, pressure gradient parameters Ks of a blade suction surface laminar flow separation point under different Reynolds numbers are obtained through high-precision performance testing / numerical calculation, and then experience prediction models of the Ks, an incoming flow Reynolds number Re, a separation point momentum thickness Reynolds number Re theta s, a blade surface separation scale and boundary layer development characteristics are sequentially established; and the influence of the low Reynolds number effect on the separation bubble structure and the boundary layer growth rate is quantified, so that the performance degradation degree of the gas compressor under the low Reynolds number can be quickly predicted. Based on the model, parameters such as excitation frequency of the front edge deformation surface of the blade are optimally configured, periodic pressure disturbance waves are induced to be generated, and dynamic regulation and control of large-scale separation flow under the low Reynolds number are achieved. The prediction speed of the performance variation of the gas compressor under the low Reynolds number is increased, and support is provided for aerodynamic design and performance regulation and control of the high-altitude gas compressor.

The utility model provides a blade for a centrifugal fan, a double-suction centrifugal impeller applying the blade and the fan. The blade comprises a suction surface wall, a pressure surface wall, a front edge, a rear edge, a convex air inlet part and a concave air outlet part, the suction surface wall and the pressure surface wall are arranged back to back and extend in the length direction of the blade firstly and then extend between the front edge and the rear edge; the protruding air inlet part is formed in the mode that the front edge part of the blade protrudes towards one side of the suction surface wall, the concave air outlet part is formed in the mode that the rear edge part of the blade protrudes towards one side of the pressure surface wall, and the protruding air inlet part and the concave air outlet part are connected in the direction from the front edge to the rear edge. In the length direction of the blade, the convex air inlet part is of a structure with high middle and two low sides, and the concave air outlet part is of a structure with low middle and two high sides; in the direction from the front edge to the rear edge, the middle height of the convex air inlet part is in a decreasing trend; and in the direction from the rear edge to the front edge, the middle height of the sunken air outlet part is in a decreasing trend.

The utility model relates to the technical field of air conditioners, and discloses an axial flow fan and an air conditioner. The axial fan includes a blade including: a blade body; and the flow guide structure is positioned on the suction surface of the blade main body and is arranged at the root of the blade main body. The distance between the flow guide structure and the blade outer edge is larger than that between the flow guide structure and the blade inner edge, that is, compared with the blade tip, the flow guide structure is closer to the blade root. In the rotating process of the fan, the flow guide structure can guide air flow to flow and scatter the air flow, so that an area with higher pressure at the root of the blade can be divided into a plurality of small areas, the pressure of each small area is reduced, channel vortexes can be inhibited, and the operation noise of the axial flow fan is reduced to a greater extent.

The present invention provides a noise reduction blade and a fan thereof, which relates to the technical field of fan devices, including a wind wheel blade, the wind wheel blade including a blade pressure surface, a blade suction surface, a blade leading edge and a blade trailing edge; the blade leading edge adopts a corrugated noise reduction design, and the blade is designed with corrugated noise reduction in both the circumferential and axial directions from the blade tip to the blade root. The present invention designs corrugations in the circumferential and axial directions on the blade leading edge, so that the blade leading edge has airflow inlet angles of different angles from the blade tip to the blade root, so that when the airflow enters the wind wheel blade, it interacts with the blade leading edge to generate pressure pulsations in different directions, which can effectively reduce the fan inlet noise; the blade is designed with corrugations in the circumferential and axial directions from the blade tip to the blade root, so that an airflow guide flow channel from deep to shallow from the blade leading edge to the blade trailing edge can be formed on the blade pressure surface and the blade suction surface, which can increase the blade strength, and can also play a role in guiding the airflow so that the airflow flows more evenly on the blade surface, thereby achieving the effect of improving the fan efficiency and reducing noise.

The invention relates to the technical field of axial flow fans, in particular to an impeller with S-shaped blades and an axial flow fan applying the impeller. On the axial projection of the impeller, the peripheral contour of each blade is defined by a blade root edge, a blade front edge, a blade outer edge and a blade rear edge, and the blade root edge is connected with the hub; the blade front edge and the blade rear edge are both wavy curves, and the blade root edge and the blade outer edge are both arc-shaped lines with the axis O of the hub as the circle center. Each blade is provided with a pressure face and a suction face, the pressure faces and the suction faces are oppositely arranged, and on the radial projection of the impeller, the pressure faces are arranged in a wave shape in a protruding mode from one end of the blade root edge to one end of the blade rear edge towards the suction faces and then concavely arranged, so that the blades are of an S-shaped structure. The problem that a traditional blade structure cannot meet the use requirements of high efficiency and low noise can be solved.

To provide an axial flow turbine which can be improved in the overall efficiency.SOLUTION: An axial flow turbine includes: a turbine shaft; a turbine rotor blade row; and a turbine housing having an exhaust chamber on a downstream side of the turbine rotor blade row. The turbine housing includes a flow guide portion having an inner peripheral-side wall surface forming a diffuser flow path for guiding the working fluid that has passed through the turbine rotor blade row to the gap from an inner wall of the exhaust chamber in a radially outward side. When a minimum distance between a rear edge end and a negative pressure surface of the other adjacent turbine rotor blade is denoted as throat s, a pitch of the plurality of turbine rotor blade is denoted as t, a blade height position at a blade root is 0%, and the blade height position at the blade tip end is 100%, a distribution of throat / pitch ratio in a blade height direction having a throat / pitch ratio at the 25% blade height position is smaller than a line segment between the blade root portion and a center portion in the blade height direction, and a throat / pitch ratio at the 75% blade height position is smaller than a line segment between the center portion and the blade distal end portion.SELECTED DRAWING: Figure 3

The invention discloses a variable geometry turbine guider blade adjusting structure and method and application, through cooperative adjustment of a slidable clamshell-shaped suction surface and a rotatable tail flap, the front thickness, the aerodynamic configuration and the throat area of a turbine blade are accurately controlled, and therefore wide-range flow adjustment is achieved. The pressure surface side fixing part provides a stable supporting and flowing path through a pressure surface section, a front end groove and a tail semicircular arc surface which are integrally formed. The slidable clamshell-shaped suction surface is connected with an external driving source and can slide along the front-end groove to adjust the shape of the blade; the rotatable tail flap further optimizes the flow regulation by rotating to regulate the shape of the throat area at the tail of the blade. According to different working condition requirements, the clamshell-shaped suction surface and the tail flap can be adjusted independently or in a linkage mode, high efficiency and stability of the turbine guider blade under different flight working conditions are guaranteed, and meanwhile the turbine guider blade has good thermal protection performance and high-temperature tolerance.

The utility model provides an impeller structure with baffles at outlet parts of folded blades and a vortex pump. The impeller structure comprises a rear cover plate, a plurality of folded blades on the front end face of the rear cover plate, a plurality of back blades on the rear end face of the rear cover plate, the baffles on the folded blades and a hub in the center of the rear cover plate. The folded blade comprises a long blade section and a short blade section which are connected with each other, the baffle plate is vertically arranged on a pressure surface and / or a suction surface of the short blade section, the width of the baffle plate is b0 = (1-2) t, the thickness of the baffle plate is t0 = (0.5-0.8) t, b0 is the width of the baffle plate, t0 is the thickness of the baffle plate, and t is the thickness of the folded blade. The baffle is arranged at the outlet part of the folded blade, so that fluid can be better guided to flow to the outlet, abrasion and blockage caused by the fact that a medium in a vaneless cavity flows into a blade channel are reduced, flow state disturbance and hydraulic loss of the blade channel are reduced, and the conveying efficiency of the vortex pump is improved.

A device has a rotor module comprising a motor generator, rotor blades, and a rotary-wing kinematic system for the rotor blades connected to the motor generator. The rotor blades are each divided into a plurality of longitudinal sections, each for receiving at least one actuator integrated in a longitudinal member or transverse member of the rotor blade, and have a variable, asymmetrical airfoil which, in one revolution of the rotor blade on a diameter of the circular path, the diameter being freely orientable within an adjustment range and having turning points, can be adjusted in at least one longitudinal section of the rotor blade with a length in such a way that the suction surface and the pressure surface of the asymmetrical airfoil change at the turning points from the outside to the inside of the circular path, or vice versa.

The utility model relates to the technical field of automatic production, in particular to a matrix type suction cup assembly which comprises a suction cup cylinder body and adsorption assemblies, one end of the suction cup cylinder body is communicated with an external vacuum generating device so as to supply negative pressure airflow, the other end of the suction cup cylinder body is communicated with the adsorption assemblies, and at least one adsorption assembly is fixedly connected to the suction cup cylinder body. The air channel is communicated with the suction cup cylinder body; the adsorption assembly is provided with at least two vacuum suction nozzles, one end of each vacuum suction nozzle communicates with the adsorption assembly, and the other end of each vacuum suction nozzle forms a free end and is used for sucking external materials. A pneumatic part is arranged in an airflow channel in the adsorption assembly. In conclusion, the pneumatic part in the air flow channel is used for flow dividing, negative pressure is evenly dispersed in the unclosed vacuum suction nozzles, the suction force of the whole suction face is even, the suction face is not affected by vacancy avoiding positions of local structures of products, the suction face is suitable for the products of different structures, the debugging time for replacing the suction cup assembly is shortened, and the production efficiency is greatly improved; and the cost is greatly reduced.

The utility model belongs to the technical field of centrifugal fans, and discloses a multi-wing centrifugal impeller and a multi-wing centrifugal fan, the multi-wing centrifugal impeller comprises an impeller disc, a plurality of blades and an impeller circular ring, the impeller disc and the impeller circular ring are connected to the two ends of the plurality of blades, each blade extends towards the circle center of the impeller disc, and the impeller circular ring is connected with the impeller disc. Each blade is provided with a front end and a rear end which are arranged at intervals in the radial direction of the impeller disc and a pressure face and a suction face which are arranged at intervals in the circumferential direction of the impeller disc, the front ends are arranged close to the circle center of the impeller disc, and sand dune type protrusions protruding towards the suction face are formed on the portions, close to the front ends, of the blades. The flow field uniformity and stability of the multi-wing centrifugal impeller are high, the flow channel shrinkage coefficient of the impeller is increased, and therefore the problem that the aerodynamic performance is poor when inlet impact loss and blade tail edge separation loss of airflow of an existing multi-wing centrifugal fan are large is solved.

The invention is suitable for the technical field of tunnel construction equipment, and provides tunnel construction self-moving type dust collection ventilation equipment which comprises an AGV trolley and a dust collection mechanism above the AGV trolley. The dust collecting mechanism comprises a group of mounting plates; the dust collection cylinder is rotationally matched between the two mounting plates through a bearing, one end of the dust collection cylinder is an open dust collection surface, a stainless steel filter screen is arranged on the open dust collection surface, the other end of the dust collection cylinder is communicated with the adsorption end of the fan through a dust guide pipe, and the discharge end of the fan is communicated with the dust collection bin through the dust guide pipe; efficient collection and treatment of dust in tunnel construction are achieved; the deep purification of the air on the construction site is jointly ensured, the dust pollution is obviously reduced, and the quality of the whole working environment is improved; and meanwhile, an intelligent monitoring system formed by the integrated dust sensor group and the PLC can monitor the dust concentration in real time and adaptively adjust the working state of the dust collection mechanism, so that the optimal dust removal effect is always kept, and the autonomy and reliability of the equipment are remarkably enhanced.

The invention discloses a turbine blade surface skin parameterized mapping grid creation and automatic interpolation method, which realizes efficient post-processing of blade surface simulation data through molded line partition splitting, arc length parameterized grid generation and physical quantity data interpolation, and comprises the following steps of: firstly, performing partition preprocessing on a blade molded line according to a pressure surface, a suction surface and front and rear tail edges; constructing a body-attached parameterized grid; then simulation data are imported and automatically partitioned, an optimization interpolation algorithm is adopted for different regions, and the interpolation precision is improved in combination with an invalid value correction technology; and finally, mapping the three-dimensional data to a two-dimensional parameter plane to realize feature visualization and analysis. According to the method, manual intervention is remarkably reduced through an automatic process, the post-processing efficiency is improved while the data precision is guaranteed, and reliable support is provided for pneumatic optimization and cooling design of the turbine blade.

A holding mechanism includes a suction section, an elastic seal member, and a clamp mechanism. The suction section has a suction surface on which a workpiece is to be vacuum-suctioned. The elastic seal member is disposed around the suction surface such that at least part of the elastic seal member is hidden by the workpiece in plan view when the suction surface is viewed from above. The clamp mechanism includes a clamp that presses the workpiece such that the workpiece comes into contact with the elastic seal member, and drives the clamp to press the workpiece when the workpiece is suctioned by the suction section.

The invention relates to the technical field of wind power generation, in particular to a blade deicing device and method and a wind generating set, and the blade deicing device comprises heating modules which are arranged on the front edge, the rear edge, the pressure surface and the suction surface of a blade and used for heating an ice layer on the surface of the blade; the monitoring module is mounted on the surface of the blade and is configured to monitor the ice layer thickness, the environment temperature and the humidity of the surface of the blade; the control module is electrically connected with the heating module and the monitoring module, and the control module is configured to start the heating module to deice if the thickness of the ice layer is larger than or equal to a first threshold value and the environment temperature and humidity meet the icing condition. The icing state of the blade can be intelligently monitored, efficient deicing is achieved, and energy conservation and environmental protection are achieved.

The invention discloses a split type adjustable blade structure of a variable geometry turbine and application of the split type adjustable blade structure, and relates to the technical field of variable geometry turbines of aero-engines. An adjustable blade is designed into a fixed petal body and a rotating petal body in a split mode, the fixed petal body is fixed in a turbine blade channel, a blade front edge and a pressure face front blade body are formed, and no radial gap exists between the blade front edge and a casing; the structure stability is ensured; the end region leakage is reduced; the rotating valve body is located on the rear portion of the fixed valve body and connected with an external adjusting mechanism through the rotating boss to achieve angle adjustment, and a blade suction face, a tail edge and a blade body on the rear portion of a pressure face are formed. A molded line transition fit structure is arranged between the fixed petal body and the rotating petal body, and the gap between the fixed petal body and the rotating petal body is kept minimum and mechanical interference does not occur in the initial and adjusting processes. A dynamic and static clearance sealing structure is further designed, and clearance leakage flow is effectively restrained by arranging a sealing groove and sealing teeth. The structure can reduce flow loss and clearance leakage loss and improve turbine efficiency and engine performance.

The wind wheel comprises a hub and a plurality of blades, the blades are connected to the circumferential wall of the hub and arranged at intervals in the circumferential direction of the hub, each blade comprises a body part and a front edge part, and the front edge parts are located at the front ends of the body parts in the rotation direction of the wind wheel. The body part is provided with a suction surface facing the air inlet side of the wind wheel, and the front edge part protrudes relative to the suction surface; the maximum outer diameter of the wind wheel is D, the maximum axial size of the wind wheel in the direction of the rotating axis is L, and the L / D is larger than or equal to 0.3 and smaller than or equal to 0.41. According to the wind wheel, the air volume can be increased, and meanwhile noise is lowered.

The invention relates to a wind power blade, a wind generating set and a wind power blade manufacturing method. The wind power blade comprises a blade body and an elastic bag body. Each blade comprises a pressure surface and a suction surface which are oppositely arranged in the thickness direction, and a front edge and a rear edge which are oppositely arranged in the width direction. The pressure surface includes a first region between the maximum thickness of the blade and the leading edge and a second region between the maximum thickness of the blade and the trailing edge. The elastic capsule body comprises an inner cavity, a first capsule piece and a second capsule piece. An inner cavity is formed between the first capsule piece and the second capsule piece. The first capsule sheet is connected to at least one of the first region and the second region. The second capsule piece is located on the side, back to the pressure face, of the first capsule piece. The elastic capsule is configured to switch between an expanded state and a contracted state. And in the switching process of the expansion state and the contraction state, the second capsule piece is far away from or close to the first capsule piece, so that the volume of the inner cavity of the elastic capsule body is increased or decreased.

The invention provides a blade structure, an axial flow blade, an axial flow fan and an air conditioner, the blade structure comprises a blade body, the blade body comprises a front edge, a suction surface, a tail edge and a pressure surface which are sequentially connected end to end, the pressure surface and the suction surface respectively extend between the front edge and the tail edge, in the airflow flowing direction, the front edge or the pressure surface is provided with a leading-in hole, and the leading-in hole is communicated with the suction surface. A leading-out hole is formed in the tail edge or the suction surface; a silencing cavity is formed in the blade body, the guide-in hole and the guide-out hole communicate with the silencing cavity, the guide-in hole guides airflow into the silencing cavity, and the guide-out hole guides the airflow in the silencing cavity out of the blade body. The leading-in holes reduce impact noise of airflow to the front edge, and the leading-out holes reduce noise of the trailing edge by changing the flowing state of the airflow at the trailing edge.

The axial flow impeller comprises a hub rotating around the axis and a plurality of blades distributed in the circumferential direction of the hub, in the axial direction from the air outlet side to the air inlet side, the diameter of the hub is gradually reduced, the front edges of the blades are close to the air inlet side, and the rear edges of the blades are close to the air outlet side. And the contact surfaces of the roots of the blades and the peripheral surface of the hub are arc-shaped. The axial flow impeller can control secondary flow and flow separation on the suction surface and the pressure surface, flow loss is reduced, and aerodynamic performance is improved; meanwhile, the front edge and the rear edge of each blade can have a good airflow guiding effect, fluid impact and energy loss on the inlet side of the axial flow impeller are reduced, and the performance of the impeller is improved.

The invention provides an axial flow fan blade and a fan comprising the same. The axial flow fan blade comprises a hub and blades. Each blade sequentially comprises a plurality of base circle sections in the direction from the blade inner edge to the blade outer edge. The contour line SP of each base circle section is generated by a first multinomial function; the starting points of the contour lines SP are connected together to form a blade front edge, the blade front edge is a large-radian curved surface, and the blade front edge is generated by a second multinomial function; the chord length L of each contour line SP is generated by a third multinomial function; the suction surface and the pressure surface of the blade in the direction from the inner edge of the blade to the outer edge of the blade are both of a curved surface structure, and the curved surface is generated by boundary mixing of a fourth multi-term function; the end points of the contour lines SP are connected together to form a blade tail edge, and the blade tail edge is of a wavy curved surface structure and is generated by a fifth multi-term function. The blades and the trailing edge of the axial flow fan blade are both based on multi-frequency harmonic superposition collaborative optimization design, the operation power consumption of the fan blade is remarkably reduced while the requirement for the air volume is met, and noise is greatly restrained.

The utility model discloses a computer support which comprises a main support body, the main support body is used for supporting a computer, a long-strip-shaped auxiliary support body magnetic suction connector is arranged on the main support body, and the auxiliary support body magnetic suction connector is provided with an auxiliary support body magnetic suction face and an auxiliary support body supporting part which extend in the length direction of the auxiliary support body magnetic suction connector. The auxiliary support magnetic attraction face is used for being connected with an auxiliary support in a magnetic attraction mode. The two sides, in the width direction, of the auxiliary support magnetic attraction face are each provided with an auxiliary support supporting part, and the auxiliary support supporting parts are used for being in separable limiting fit with the auxiliary supports so as to provide supporting force for the auxiliary supports in the length direction around the auxiliary support magnetic attraction face. The computer support can be quickly detached from the auxiliary support through the auxiliary support magnetic suction connector, the auxiliary support supporting portion of the main support can provide supporting force for the auxiliary support, the auxiliary support is prevented from being easily separated from the auxiliary support magnetic suction face, and therefore the auxiliary support is prevented from being easily disengaged from the main support, convenience of detachment and installation can be improved, and the computer support is convenient to use. And the connection stability of the auxiliary bracket and the main bracket can be improved, so that the use effect of the computer bracket is improved.

The invention provides a high-load supersonic cascade and a gas compressor, and belongs to the technical field of gas turbine gas compressors. The blade grid comprises blades and vortex generators, the vortex generators are installed in the front edge areas of the blades, and the vortex generators and the suction surfaces of the blades are located on the surfaces of the same sides of the blades. In the airflow direction corresponding to the blades, the height of the vortex generator is gradually reduced, the width of the vortex generator is gradually increased, and the width of the vortex generator is the size of the vortex generator in the spreading direction of the blades. The vortex generators in specific shapes are arranged on the surfaces of the blades, so that after airflow passes through the vortex generators, two reverse vortex pairs spaced by a certain distance can be generated, and the two reverse vortex pairs can entrain the airflow from a mainstream area with more gas and supplement the airflow to a shock wave / boundary layer interference separation area lacking gas; therefore, flow separation of the rear half section of the suction surface is inhibited, flow loss is reduced, and aerodynamic performance of the cascade is improved.

The three-dimensional woven composite material piece topology flattening method for designing the twisted blade comprises the following steps that S1, a twisted curved surface is extracted from the twisted blade, two-dimensional twisted grids are designed on the twisted curved surface, and coordinates of intersection points of all the twisted grids corresponding to all the positions on the twisted curved surface are obtained; s2, obtaining the thickness data of the distance between the intersection point of each bending and twisting grid and the pressure surface and / or the suction surface of the blade; s3, converting the torsion curved surface into a two-dimensional flattened feature surface, and generating a two-dimensional grid for the two-dimensional design surface to obtain a two-dimensional coordinate; and S4, coordinates of intersection points of the bending and twisting grids are converted into two-dimensional coordinates in the two-dimensional grids, and the two-dimensional coordinates are endowed with the thickness data obtained in the step S2. According to the method, the topological flattening problem of the three-dimensional woven composite material bending and twisting blade is solved, the designed shape of the three-dimensional woven composite material fan blade is converted into a flat-plate-like model which can be realized on a knitting machine, and the design precision is effectively improved.

A device (10) and a method for handling articles (11) are disclosed. The device (10) comprises a gripping device (14) with a suction surface (16) that can be subjected to negative pressure and for grasping the articles (11) by suction. The suction surface (16) is covered with an elastically deformable layer (24) that is at least partially permeable to air. The device (10) is also equipped with a drying device (32) which can interact with the layer (24) attached to the suction surface (16) or forming the suction surface (16) in order to remove moisture bound or adhering therein.

The application discloses a low-stress clamp and a clamping method, the low-stress clamp comprising a suction cup, a sliding ring mechanism mounted on the suction cup and a swing arm structure capable of driving the sliding ring mechanism to translate, the sliding ring mechanism comprising a sliding ring body and a sliding ring sleeve coaxially connected, the suction surface of the suction cup is provided with a plurality of suction parts, the cavity in the suction cup and the suction parts are communicated, the communication channel in the sliding ring body is communicated with the cavity, the annular channel between the sliding ring body and the sliding ring sleeve and the vacuum pipe communicated with the annular channel on the sliding ring sleeve, and the air in the cavity is sucked to enable the plurality of suction parts to uniformly adsorb the parts to be polished; the clamping method is as follows: the sliding ring mechanism and the suction cup are assembled, the suction parts contact the parts to be polished on the polishing disc, the external air suction part is opened to adsorb the parts to be polished, and then the swing arm structure is made to abut against the sliding ring body; the surface of the parts to be polished after clamping can be guaranteed to be flat through vacuum adsorption, the polishing quality is improved, the clamping is fast and convenient, and the machining efficiency is improved.

The utility model discloses a blade of an axial flow pump, which belongs to the technical field of axial flow pumps and comprises a blade body, and a first wing blade and a second wing blade are fixedly connected to a pressure surface and a suction surface of the blade body respectively. The first wing cutter strip and the second wing cutter strip are respectively fixed at the same blade height of the blade main body; and the chord lengths of the first wing blade and the second wing blade are equal to those of the blade height corresponding to the blade main body. By means of the first wing cutter strips and the second wing cutter strips, secondary backflow formed on the hub side at the outlet of the impeller can be weakened in a physical interception mode when flow is reduced.