654 results about "Torsional rigidity" patented technology

The invention discloses a high-precision and high-reliability harmonic reducer tooth profile simulation machining design method, and belongs to the field of precision transmission. A composite cycloid flexible gear tooth profile is designed by establishing a harmonic reducer geometrical relationship model, deducing a flexible gear deformation equation, an accurate rotation angle relationship and a meshing theory based on an envelope method, and a conjugate region and a conjugate tooth profile are calculated by utilizing MATLAB. Actual deformation and theoretical deformation errors of the flexible gear are analyzed through finite element simulation, flexible gear profile parameters are optimized, an actual neutral layer curve is generated, and then a rigid gear profile is enveloped and calculated. The tooth profile design adopts a non-zero inclination angle composite cycloid, so that the meshing area is expanded by more than 30%, and the maximum stress of the flexible gear is reduced by 22.75% in combination with a linear modification method and a finite element modification method. In addition, through a multi-physical field simulation verification system (including static deformation, dynamic contact and fatigue life prediction) and a neural network optimization tooth shape parameter, the transmission performance is remarkably improved. According to the method, the torsional rigidity can be improved by 66%, and the transmission error is controlled within a high-precision range.

The invention belongs to a new energy automobile body structure in the technical field of new energy automobiles. The outer frame beam (4) and the lower bottom plate (5) are of an integrated structure made of aluminum alloy, a trapezoidal structure or a wedge-shaped structure is arranged on the outer side of the outer frame beam (4), a protruding part (10) of the threshold inner plate (9) abuts against the upper portion of the outer frame beam (4), an inner plate inclined face part (11) abuts against an outer frame inclined face part (7), a bolt bush (13) is arranged on the inner side of the inner plate inclined face part (11), and a threaded sleeve (14) is arranged on the inner side of the outer frame beam (4). A bolt (15) is connected with the threaded bushing (13) and the threaded sleeve (14), and an internal arrangement beam (6) is arranged in the lower shell (2) under the seat cross beam. According to the new energy automobile body structure, the structure is simple, the space utilization rate is increased, meanwhile, the bending torsion and collision performance of an automobile body is improved, meanwhile, the safety performance of side collision and side column collision is improved, and the torsional rigidity and the side collision performance of the automobile body are improved.

The invention provides an aluminum alloy frame multistage collaborative topological optimization method based on Internet of Vehicles big data, which is applied to the technical field of new energy vehicle lightweight and comprises the following steps: fusing subjective and objective weights to generate a comprehensive weight; a compromise planning method is adopted to construct a multiplex topological optimization objective function; performing first-stage frame overall topological optimization through an SIMP variable density method to determine the number of cross beams and spatial layout; and constructing a rigid-flexible coupling virtual prototype to extract an equivalent static load at the joint of the longitudinal / cross beam, and carrying out second-stage section topological optimization in combination with extrusion process constraint to obtain an optimal section configuration of the longitudinal / cross beam. Through a multi-stage optimization framework of data driving weight distribution, overall layout optimization and local section collaborative design, the lightweight rate of the frame is improved by 15%-22%, the bending rigidity and the torsional rigidity are improved by 12%-18% and 10%-15% respectively, and meanwhile the technological feasibility of aluminum alloy extrusion forming is guaranteed.

The invention relates to the technical field of cables, and discloses a weather-proof high-strength tensile aerial insulated cable and a preparation method thereof.The weather-proof high-strength tensile aerial insulated cable comprises a cable conductor, a protection mechanism is arranged outside the cable conductor, a supporting mechanism is arranged inside the protection mechanism, and an outer sheath is connected to the outside of the protection mechanism through a cushioning mechanism; the exterior of the cable conductor is fixedly connected with a force bearing layer, the exterior of the force bearing layer is provided with a repairing layer, the exterior of the repairing layer is fixedly connected with a heat insulation fireproof layer, the cushioning mechanism comprises an elastic rubber layer, and the inner side of the elastic rubber layer is fixedly connected to the exterior of the heat insulation fireproof layer. According to the invention, through the hollow bionic structure with the diaphragm in the core tubular bearing layer, the self weight is greatly reduced, and excellent bending resistance and torsional rigidity are provided at the same time; when the bearing layer is accidentally impacted, the internal diaphragm can effectively prevent longitudinal spreading of microcracks like a firewall, and damage is limited locally.

The invention relates to the technical field of vehicle control, in particular to a torque control method and device of a vehicle transmission system and electronic equipment. The method includes: acquiring actually measured torsion angular velocity; calculating a transmission shaft torsion angular velocity, a transmission shaft torsion angle and a transmission shaft torsion rotating speed based on the actually measured torsion angular velocity; calculating the torque of the transmission shaft based on the pre-obtained equivalent damping coefficient and equivalent torsional rigidity as well as the calculated torsion angular velocity and torsion angle of the transmission shaft; calculating the required torque of the driven shaft based on the calculated torque of the transmission shaft and the pre-obtained load torque of the wheel end; anti-oscillation compensation torque is calculated according to the calculated torsion rotating speed of the transmission shaft and the pre-obtained rotational inertia of the driving end and the equivalent damping coefficient; and superposing the anti-oscillation compensation torque at the previous moment to the calculated required torque of the driven shaft to obtain the compensated required torque of the driven shaft, and outputting the compensated required torque of the driven shaft. The torque can be accurately controlled, and pause or movement is avoided.

The present invention features a micrometer-scale torsion balance device comprising a rigid mass and two or more nanoribbons attached to the rigid mass. The rigid mass may be suspended by the two or more nanoribbons. The two or more nanoribbons may be placed under tensile stress. A local acceleration value may be derived from a torsional stiffness of the two or more nanoribbons. In some embodiments, the rigid mass may comprise silicon. In some embodiments, the two or more nanoribbons may comprise silicon nitride. In some embodiments, the rigid mass may have a polygon shape, the polygon shape having four or more sides. A side of the four or more sides may be longer than all others.

A caster board can include a front platform, a rear platform, and at least two neck sections extending between the front platform and the rear platform. The neck sections can serve as a torsion element allowing twisting of the front platform relative to the rear platform. An aperture between the neck sections can be configured to receive an insert. The insert can alter a structural characteristic of the caster board, such as the torsional stiffness of the caster board.

The invention provides a drill string vibration reduction method and device.The method comprises the steps that longitudinal vibration data and torsional vibration data of a target drill string when a vibration reduction tool is tripped into multiple positions are obtained, and the longitudinal vibration data comprise hook load, a mass matrix, a stiffness matrix, a structural damping matrix, a drilling fluid damping effect matrix, a speed vector and an acceleration vector; the torsional vibration data comprises a rotational acceleration vector, a rotational speed vector, a rotational inertia matrix, a torsional rigidity matrix, a torsional structure damping matrix and a torsional drilling fluid damping matrix; the vibration intensity of the whole well section is determined by applying the longitudinal vibration model, the torsional vibration model, the longitudinal vibration data and the torsional vibration data; and according to the vibration intensity of the whole well section, the optimal tripping-in position of the vibration reduction tool is selected from all the positions, the vibration reduction tool is tripped into the optimal tripping-in position, and the vibration reduction process of the target drill column is completed. The reliability of the tripping-in position of the vibration reduction tool can be improved, and then the vibration reduction effect of the drill column can be improved.

The invention provides a rotor blade torsional rigidity testing device, and the device comprises a blade fixing tool which is used for fixing a blade; the circular coding marks are adhered to the two ends of the measured section of the paddle; the loading tray is used for applying force to the paddle; the image acquisition system is arranged above the paddles, and the image acquisition system is used for acquiring images; meanwhile, the invention further provides a rotor blade torsional rigidity testing method, coding marks are pasted on the surfaces of the blades, three-dimensional plane information is fitted through the MPS industrial camera, the torsional rigidity of the blades is obtained through calculation, and the rotor blade torsional rigidity testing method has the advantages of being easy to install, high in precision and high in stability.

The invention discloses a torsion beam assembly, a vehicle and a control method of the vehicle, the torsion beam assembly comprises two longitudinal beams which extend in the front-back direction of the vehicle, one end of each longitudinal beam is suitable for being connected with a wheel, the other end of each longitudinal beam is suitable for being connected with a vehicle body, and the number of the longitudinal beams is two; the cross beam extends in the left-right direction of the vehicle, the left end and the right end of the cross beam are connected with the two longitudinal beams respectively, and the cross beam can move in the front-back direction of the vehicle relative to the longitudinal beams; the driving part is connected with the cross beam, and the driving part is suitable for driving the cross beam to move back and forth relative to the longitudinal beam. According to the torsion beam assembly, the torsion rigidity of the torsion beam assembly can be adjusted by adjusting the relative positions of the cross beams and the longitudinal beams in the front-back direction, so that the adaptability of the torsion beam assembly to road conditions is improved, and the driving experience of people in a vehicle is improved.

The invention relates to the technical field of automobile part structures, in particular to a cabin beam structure, a cabin assembly and an automobile. Comprising a cross beam body which is of a plate-shaped structure arranged in the Y direction, and lap joint faces are arranged at the two ends of the cross beam body; the lap joint faces completely cover and are fixed to the upper end faces of the corresponding tower bases in a lap joint mode. The connecting plates are arranged at intervals in the Y direction, one ends of the connecting plates are arranged on the side, facing the front wall plate, of the cross beam body, and the other ends of the connecting plates are fixed to the front wall plate. According to the cabin cross beam structure, the integration degree is greatly improved, the comprehensive cost is greatly reduced through the lightweight design, in addition, the torsional rigidity of a vehicle body is improved through the adopted multi-claw structure, and the connecting strength of the cabin cross beam and a tower base is improved.

The invention belongs to the technical field of in-service inspection of pressure pipes, and discloses an anti-torsion long-stroke multistage sealing telescopic structure which comprises a main cable driving guide assembly and a rigid chain driving assembly which are connected, the rigid chain driving assembly is installed at one end of a support guide rail assembly, and a rigid chain library is arranged below the support guide rail assembly. A rigid chain is arranged in the rigid chain library, the multi-stage telescopic sleeve is arranged on the support guide rail assembly in a penetrating mode, the front end of the rigid chain is connected with the tail end of the multi-stage telescopic sleeve, and the rigid chain driving assembly drives the rigid chain to move so as to drive the multi-stage telescopic sleeve to retract and expand. The in-service inspection of the CANDU nuclear reactor pressure pipe can be realized, the driving stroke is long, the circumferential torsional rigidity is enough, the sealing performance is realized, the inspection tool is continuously pushed forwards, the stroke range of the inspection tool covers the whole length of the pressure pipe, and in the inspection execution process, each sealing part of each stage of telescopic component does not generate visible leakage.

The invention relates to the technical field of experiments, in particular to an experimental method and system for testing the torsional rigidity of an aircraft tire, and is used for testing the yaw torsional rigidity of the aircraft tire under various conditions. The aircraft tire is accelerated to the target rotating speed, and then the vertical load is applied to the aircraft tire through the first oil cylinder. And finally, controlling the second oil cylinder to perform yaw torsion control on the aircraft tire according to the yaw torsion angle curve. And yaw torsion moment is collected in the yaw torsion control process. And finally, the torsional rigidity of the aircraft tire can be calculated through the torsional moment and the yaw torsional angle. According to the invention, different deflection angles can be tested under the conditions of different rotating speeds and loads, so that the corresponding torsional rigidity is obtained. In addition, a dynamic real-time stiffness model calculation method is adopted to apply the load, so that the load control is more accurate, and the safety of the aircraft tire is ensured at the same time.

The utility model provides a front cabin connecting structure and a vehicle. The front cabin connecting structure comprises a front longitudinal beam, a front wheel cover side reinforcing beam assembly, a front anti-collision beam assembly and an upper cross beam. And the front longitudinal beam is connected with one side of the front anti-collision beam assembly. The front wheel cover side reinforcing beam assembly comprises a side reinforcing beam and a connecting cavity. The side reinforcing beams are located above the front longitudinal beams and connected with the front longitudinal beams through the connecting cavities. And the side reinforcing beam is connected with one side of the upper cross beam. The side reinforcing beam is connected with the upper cross beam and is connected with the front longitudinal beam through the connecting cavity, so that the force transmission efficiency is improved, the structure is simple, all parts of the vehicle body are uniformly stressed, and the overall torsional rigidity of the vehicle body is improved.

A body-on-frame pickup truck, comprising a frame (100) and a truck body (200) connected to the frame, wherein the truck body comprises a passenger compartment (210) and a cargo bed (220), which are integrated with each other; and the frame and the truck body are provided with a plurality of hard connection points (401, 402, 403, 404, 405, 406, 407, 408, 409, 410), and the plurality of hard connection points cooperate with a plurality of fasteners (300) to implement a hard connection between the truck body and the frame. The passenger compartment and the cargo bed are integrally connected to each other, such that the connection between the passenger compartment and the cargo bed is enhanced, and the appearance of the pickup truck, the stability of the cargo bed, the collision safety and the handling and stability performance are improved. Moreover, the plurality of hard connection points cooperating with the fasteners are arranged to enable the hard connection between the truck body and the frame, such that the bending stiffness and the torsional rigidity of the pickup truck are improved, and the driving safety is further improved.

The invention discloses an integrated front cabin manufacturing method, an integrated front cabin structure and a lower vehicle body assembly with the integrated front cabin structure. The integrated front cabin manufacturing method comprises the steps that pouring liquid is poured into a front cabin mold, and vacuumizing operation is conducted on the tops of shock absorption tower molds on the left side and the right side of the front cabin mold, the left side and the right side of the rear portion and the middle portion of the front cabin mold and a feeding pipe of the pouring liquid; and pouring liquid overflowing from the top of the damping tower mold is guided out to a cinder ladle. The front cabin manufactured through integrated die casting is only provided with one part and has high integration, good lightweight performance, good front cabin size precision and excellent collision performance, the vehicle body rigidity and torsional rigidity of the white vehicle body are effectively improved, manufacturing is convenient, and the forming performance is excellent.

The invention discloses a low torsional rigidity design and calculation method for a permanent magnet coupling. According to the method, through the low-torsional-rigidity structural design, transmission of vibration from the driving end to the load end can be effectively reduced, the service life of shafting parts is prolonged, the transmission reliability is improved, and the high practical application value is achieved; besides, according to the magnetic circuit forming characteristics of the drum-type permanent magnet coupling, an equivalent magnetic circuit of the drum-type permanent magnet coupling is constructed based on an equivalent magnetic circuit method, the torque and rigidity analytic expression of the drum-type permanent magnet coupling is deduced by solving the magnetic circuit, and finite element calculation which is long in time consumption and complex in calculation does not need to be carried out. The method can provide important technical support for the initial stage of design, torsional rigidity prediction, vibration reduction and isolation effect evaluation and the like of the drum-type permanent magnet coupler, and has the advantages of simplicity in operation, high adaptability, short calculation time and the like in practical engineering application. The method is a calculation method with engineering practical application value.

The invention relates to an automobile rear wall assembly, a vehicle and an installation method of the automobile rear wall assembly, and belongs to the technical field of automobiles. The automobile rear wall assembly comprises a rear wall inner plate assembly and a first rear wall outer plate assembly, the rear wall inner plate assembly comprises a first connecting part, a main body part and a second connecting part which are connected in sequence, the main body part is suitable for being connected with a rear floor of an automobile, and the first rear wall outer plate assembly is located on the rear side of the rear wall inner plate assembly; the first end of the first rear wall outer plate assembly is connected with the first connecting part, and the second end of the first rear wall outer plate assembly is connected with the second connecting part, so that the first connecting part, the main body part, the second connecting part and the first rear wall outer plate assembly are enclosed to form a first cavity structure. The cross section of the automobile rear wall assembly can be increased, and the torsional rigidity of the automobile rear wall assembly can be improved.

The invention discloses a method and system for calculating the longitudinal torsional rigidity effective rate of a rectangular pipe-jacking tunnel under combined acting force and a storage medium. The method comprises the following steps that S1, the bending-pressing-twisting combined acting force on a calculation unit of the rectangular pipe-jacking tunnel is obtained according to the stress condition of the rectangular pipe-jacking tunnel; s2, the stress state of the pipe jacking lining structure is judged according to the relation between the bending moment and the axial force, and the stress state of the structure is divided into two different conditions according to the position of a neutral axis; s3, for different stress states, according to deformation coordination conditions and mechanical equilibrium conditions, calculating the distance between a neutral axle on the section and the center of the section; s4, according to the torque balance condition and further according to the two different conditions, the position of the torsion center and the anti-friction torque generated by the concrete in the pressed area are calculated; and S5, calculating a joint torsion angle and equivalent torsional rigidity, and further calculating the effective rate of the torsional rigidity. The longitudinal torsional rigidity effective rate of the rectangular pipe-jacking tunnel under the bending, pressing and twisting combined acting force can be rapidly and accurately obtained, and a basis is provided for structural safety analysis of the rectangular pipe-jacking tunnel.

The invention discloses a prefabricated heat preservation groove type plate floor slab system of an assembly type steel structure trestle, and relates to the technical field of groove type prefabricated heat preservation floor slabs, the prefabricated heat preservation groove type plate floor slab system comprises an anti-skid face plate and a heat preservation bearing mechanism, the heat preservation bearing mechanism is arranged at the bottom of the anti-skid face plate, the heat preservation bearing mechanism comprises a plurality of sealing plates, and the sealing plates are arranged in the anti-skid face plate. The multiple sealing plates are arranged and located at the bottom of the anti-skid panel, multiple second supporting blocks are arranged at the bottoms of the sealing plates, groove-shaped plates are arranged on the outer sides of the multiple second supporting blocks, structural blocks are integrally formed through pouring and extruding, reinforcing strips are arranged on the inner walls of the structural blocks, and the structural blocks and annular hoops form a two-way constraint combined framework which can bear bending moment and shearing force; therefore, the bending resistance, the shearing resistance, the torsional rigidity and the overall bearing capacity of the plate body are improved on the premise that heat preservation is not affected on the whole, the engineering problems are avoided, and normal construction work and construction time are maintained.

The invention relates to the technical field of vehicle frames, and discloses a vehicle frame system and a vehicle, the vehicle frame system comprises a main vehicle frame and an auxiliary vehicle frame, the main vehicle frame comprises a first main longitudinal beam, a second main longitudinal beam, a first main cross beam and a second main cross beam, and the first main cross beam and the second main cross beam are both fixedly connected between the first main longitudinal beam and the second main longitudinal beam; the auxiliary frame comprises a first auxiliary cross beam and a second auxiliary cross beam, the first auxiliary cross beam and the second auxiliary cross beam are both fixedly connected between the first main longitudinal beam and the second main longitudinal beam, the first auxiliary cross beam is located below the first main cross beam in the height direction of the vehicle, and the projection of the first main cross beam in the height direction of the vehicle is at least partially overlapped with the first auxiliary cross beam; in the height direction of the vehicle, the second auxiliary cross beam is located below the second main cross beam, and the projection of the second main cross beam in the height direction of the vehicle is at least partially overlapped with the second auxiliary cross beam. Therefore, a double-arch-shaped annular structure can be formed, and the lateral rigidity and the torsional rigidity of a frame system can be improved.

The invention relates to the technical field of direct connection spindle detection, in particular to a direct connection spindle torsional rigidity detection method and system, and the method comprises the steps: circularly collecting direct connection spindle motion data, carrying out the classification analysis, and carrying out the fitting of the direct connection spindle motion data collected at a single time, and generating a torsional feature vector; according to the torsion feature vector, the torsion rigidity state of the direct connection main shaft is defined and divided into different rigidity levels, and a torsion rigidity node value is generated for each rigidity level; taking the torsional rigidity node value as an aggregation center, aggregating the torsional feature vectors to obtain a plurality of vector aggregation results, and generating a torsional rigidity threshold value according to the vector aggregation results; a torsional rigidity detection model is established according to the torsional rigidity threshold values, and the torsional rigidity detection model detects the torsional rigidity of the direct connection main shafts of different specifications according to different torsional rigidity threshold values. According to the invention, the problem of inaccurate detection of the torsional rigidity of the direct connection main shaft is effectively solved.

The invention discloses an aircraft panel impact test boundary stiffness equivalent simulation method and device, and belongs to the technical field of aircraft ground tests. According to the equivalent simulation device, a local wall plate test piece is adopted to replace an overall fuselage frame to carry out an impact test, a supporting rack is arranged on a base, and a vertical rigidity simulation spring assembly and a bending rigidity simulation device are borne on the basis of the supporting rack; a torsional rigidity simulation spring assembly and a longitudinal rigidity simulation spring assembly are arranged on the bending rigidity simulation device, and a local wallboard test piece is installed on the bending rigidity simulation device. According to the simulation device, the boundary rigidity of the aircraft panel when the aircraft panel is impacted is decomposed into torsional rigidity, vertical rigidity and longitudinal rigidity, so that the boundary rigidity is converted into three groups of linear springs in different directions for rigidity simulation, accurate simulation of the boundary rigidity is ensured, decoupling of boundary rigidity simulation is also realized, and the simulation accuracy is improved. And the design difficulty of the test device is reduced.

The invention discloses an automobile body-in-white performance detection method and device, a medium and a product, and relates to the field of body-in-white performance detection.The method comprises the steps that performance indexes of a body-in-white to be detected are obtained; determining a top performance coefficient based on the load-vehicle curb mass ratio and a corresponding standard range; determining a side door performance coefficient based on the side door extrusion resistance force and a corresponding standard range; safety belt / seat performance coefficients are determined based on the safety belt / seat fixing point strength and the corresponding standard range; determining a torsional rigidity performance coefficient based on the torsional rigidity and a corresponding standard range; determining a leakage rate performance coefficient based on the maximum leakage rate and the corresponding standard range; determining a lightweight performance coefficient based on the lightweight coefficient and a corresponding standard range; determining a utilization rate performance coefficient based on the material utilization rate and a corresponding standard range; and determining a total performance coefficient according to each performance coefficient so as to determine the performance grade of the to-be-detected body-in-white. According to the invention, the body-in-white performance detection accuracy is improved.

The invention discloses a design scheme obtaining method, device and equipment for a die-casting vehicle body structural member and a medium, and relates to the technical field of technological parameter design, and the method comprises the steps that a main design area of an integrated die-casting aluminum alloy material is analyzed; a tensile test is conducted on the main design area of the integrated die-casting aluminum alloy material, and mechanical property parameters are obtained; establishing a body-in-white finite element model and performing bending-torsional rigidity simulation calculation to obtain a body-in-white bending-torsional rigidity result; establishing an equivalent boundary condition for the rear floor structure based on a body-in-white bending-torsional rigidity result, and performing equivalent simulation analysis to obtain an equivalent simulation analysis result; establishing an optimization model of the rear floor structure according to an equivalent simulation analysis result; performing topological optimization on the optimization model to obtain a topological optimization result; carrying out lightweight design on the rear floor structure based on a topological optimization result; checking the performance of the rear floor structure after the lightweight design; and adjusting the rear floor structure after lightweight design according to a checking result.

The invention discloses a multi-split conductor icing characteristic test device and a torsional rigidity design method thereof. The device comprises two supporting frames and a plurality of multi-split conductor segments arranged between the two supporting frames. The conduction direction of the tension of the horizontal spring is changed through the string, so that the torsional rigidity of the multi-split conductor icing characteristic test device is kept constant during large-angle torsion, and the device can be used for the large-angle torsion icing characteristic test of the multi-split conductor; according to the torsional rigidity design method, on the basis of a modal superposition method and a dynamic similarity criterion, all physical parameters of the multi-bundle conductor icing characteristic test device are obtained, and accurate design of the torsional rigidity of the multi-bundle conductor icing characteristic test device is achieved by adopting different horizontal spring rigidity and torque loading disc radius combinations; and the icing characteristic of any position of any real multi-split conductor can be accurately simulated.

A cross frame for a bicycle, such as an e-bike, includes a head tube and a seat tube with a bottom bracket area arranged at the lower end of the seat tube, a straight first tube starting from the head tube which crosses the seat tube and then extends towards a rear dropout of a rear triangle of the cross frame, a second tube starting from the head tube above the first tube which crosses the first tube at an intersection and then extends towards the bottom bracket area, and at least one chain stay extends from the bottom bracket area to the rear dropout. The second tube has an angular deflection within the plane of the frame in the section between the head tube and the intersection to create a visually appealing frame that offers high stability and torsional rigidity with minimal weight and allows for improved handling of a bicycle equipped with the frame.

The utility model discloses an expansion sleeve diaphragm type high-torque high-rotating-speed flexible high-precision main shaft connecting device, which relates to the technical field of couplings and comprises a stainless steel diaphragm, and two sides of the stainless steel diaphragm are connected with side section outer cones; a side section inner cone is mounted on the outer side of the side section outer cone in a matched manner; the conical holes in the inner sides of the side section inner cones extrude the elastic cones inwards, so that the elastic cones and the shaft are tightly held and fixed, as the elastic cones are the four elastic die petals, the shafts with different diameters can be locked and fixed, the structure is simple, and the use is flexible; due to the fact that the stainless steel membranes are made of stainless steel, and the multiple membranes are used in a stacked mode, high elasticity and torsional rigidity are achieved, reliable power transmission and positioning functions can be provided, the membranes can absorb vibration and impact and compensate radial, angular and axial deviations, other mechanical elements are effectively protected, and the service life of the membrane is prolonged. The service life of the coupler is prolonged.

To improve torsional rigidity around a grip part, to increase a degree of freedom in design, and to easily bring a gravity center position close to a lower end of the grip part.SOLUTION: A pickleball paddle (10) includes: a grip portion (11) extending in a vertical direction; and a head portion (12) provided on an upper end side of the grip portion and forming a ball hitting surface (20) for hitting a ball on both sides in a thickness direction. A connection part (B) between the head part and the grip part is provided with a connection part (30) for reinforcing the connection part. An upper end (30a) of the connection part is provided below a vertical center position (C2) of the entire puddle.SELECTED DRAWING: Figure 1

The invention discloses a robot branched chain body torsional rigidity testing device and method, and the device comprises a horizontal iron which is used for movably connecting a torsional rigidity testing module and two bases; the two bases are respectively used for fixing the supporting module and the test connecting piece; the supporting module is used for slidably connecting and fixing a sliding block and a sliding rail of a tested piece; the test connecting piece comprises a shaft connecting piece and a branched chain body connecting piece which are coaxially connected; the branch chain body connecting piece is used for being coaxially connected with a tested piece, and the shaft connecting piece is used for being coaxially connected with the torsion module; the torsional rigidity testing module comprises a loading module, a torsion module, a measuring module and a controller; the loading module applies a load to the torsion module; the torsion module is rotationally connected with the shaft connecting piece and converts the load of the loading module into a torsion force on the tested piece; the measuring module is used for detecting the transverse and longitudinal displacement of the branched chain body connecting piece; the controller obtains the load of the loading module and the displacement detected by the measuring module. The torsional rigidity of the robot branched chain body can be tested.