155 results about "Flexural rigidity" patented technology

The invention relates to the technical field of constructional engineering equipment, in particular to a rigidity and energy dissipation adjustable composite energy dissipation bearing device which comprises a first connecting plate, a second connecting plate, a first damping part and a second damping part. The first damping piece is arranged on the first connecting plate on the column body in a friction sliding mode, and the second damping piece is connected between the beam body and the first damping piece in an included angle mode, so that the flexural rigidity of the beam-column joint can be effectively improved under the action of frequent earthquakes, and the initial rigidity and lateral displacement resistance of the structure are enhanced; the rigid response performance of the structure under the action of small earthquakes is improved; the second damping piece can adjust the energy dissipation path through the change of the included angle between the length direction of the second damping piece and the axis of the column body in the earthquake action process, the friction sliding mechanism of the first damping piece is matched, the energy dissipation capacity of the joint under the earthquake action is effectively improved, and therefore structural stress concentration is reduced, and structural damage is delayed. The structure is light in weight, convenient to install and wide in application range.

The invention discloses a frame structure design method based on rigidity reduction. The method comprises the following steps that 1, rod end bending moments Mb and Mc and axial force Nc of frame beams and columns are obtained through calculation; step 2, obtaining actual reinforcement areas Asb0 and Asc0, section sizes and concrete strength of frame beams and columns; 3, the equivalent stiffness Kb1 of the frame beam is obtained through calculation according to the formula Kb1 = Mb0.75y / phi b0.75y; 4, the equivalent stiffness Kc1 of the frame column is obtained through calculation according to the formula Kc1 = Mc0.75y / phi c0.75y; 5, comparing the equivalent stiffness of the frame beam and the frame column with the initial flexural stiffness, and ending after the deviation is less than or equal to 15%; 6, calculating a shear force design value of the frame beam, calculating stirrups needing to be configured for the frame beam, and rechecking a shear-resistant section; and 7, calculating a shear force design value of the frame column, calculating stirrups needing to be configured for the frame column, and rechecking a shear-resistant section. Compared with the prior art, an overall calculation model of the frame structure is established, the real rigidity of a structural member is obtained through multiple iterations, section reinforcement is optimized, and the reinforcement amount is reduced; and the overall anti-seismic performance is improved.

The invention discloses a stay cable analysis digital twinborn model construction method, which comprises the following steps of: constructing a stay cable space three-dimensional vibration motion partial differential equation based on a material linear elasticity hypothesis and a double-coordinate system theory, and setting boundary conditions and initial conditions of the stay cable space three-dimensional vibration motion partial differential equation; a Galerkin multi-mode truncation method is adopted to obtain a displacement function of superposition of an end displacement excitation item and a vibration mode item; deducing a three-way strong coupling ordinary differential equation set through symbolic operation, and solving by using a step-variable Runge-Kutta algorithm to obtain a stay cable analysis digital twin model with stable parameters; structural response data are obtained through the sensor network and calculated, and when the obtained cable force, flexural rigidity and damping ratio exceed threshold values, a model updating mechanism is triggered for updating; and then the updated stay cable analysis digital twin model is obtained. According to the method, the real dynamic characteristics of the stay cable can be restored with high precision, and effective support is provided for structural state evaluation and early warning.

The utility model belongs to the technical field of steel structures, and particularly relates to I-shaped steel for a bridge, which comprises an I-shaped steel body, a plurality of holes are uniformly distributed on a web of the I-shaped steel body, and foamed aluminum is filled in each hole. A plurality of reinforcing ribs are further arranged on a web of the I-shaped steel body, the reinforcing ribs and the holes are distributed in a staggered mode, every two adjacent I-shaped steel bodies are connected through a connecting mechanism, the holes are of a hexagonal structure and evenly divided into a plurality of groups, and the multiple groups of holes are evenly distributed in the length direction of the I-shaped steel body. The plurality of groups of holes and the plurality of reinforcing ribs are alternately distributed; according to the utility model, the plurality of holes are formed in the I-shaped steel body, and the foamed aluminum is filled in each hole to form a'metal framework + core material 'composite structure, so that compared with a solid web, the weight is reduced by 25%-30%, and the flexural rigidity is improved at the same time; the adjacent I-shaped steel is connected through the connecting mechanism, and detachable connection is achieved.

The sandwich panel of the present invention comprises: a foamed molded body; a first thermoplastic continuous fiber reinforced woven body fused to an upper portion of the foamed molded body; a second thermoplastic continuous fiber reinforced woven body fused to a lower portion of the foamed molded body; and one or more composite material bars embedded in the foamed molded body. The sandwich panel exhibits excellent rigidity (flexural strength, flexural rigidity, and maximum deflection), lightweight properties, and the like.

The invention discloses a large-diameter slide-resistant pile double-layer reinforcement cage and a construction method thereof. The reinforcement cage comprises a concrete outer layer, outer longitudinal bars, middle-layer reinforcing stirrups, inner longitudinal bars, inner reinforcing stirrups, triangular supports, first corner joints and second corner joints. An inner cavity is formed in the concrete outer layer, outer longitudinal bars are evenly arranged in the inner cavity in the circumferential direction, and spiral outer stirrups are arranged on the outer walls of the outer longitudinal bars. Structural design is adopted, a closed-loop three-dimensional truss supporting system is constructed through the spiral outer stirrups, the middle-layer reinforcing stirrups, the inner reinforcing stirrups and the triangular supports, the outer longitudinal bars and the inner longitudinal bars are integrated into a high-strength overall framework, and the bending rigidity and the deformation resistance of a cage body are remarkably improved; the stress of the 41-ton cage body in the whole process of transportation, hoisting and concrete pouring can be effectively dispersed, structural damage to the long-size cage body is avoided, and the structural form of the device is compatible with the construction sequence that the outer cage is hoisted downwards first and then the inner cage is hoisted upwards, and the inner cage is connected upwards and then the outer cage is constructed.

The application provides a short cable force and stiffness meta-heuristic intelligent identification method considering bending stiffness, and belongs to the field of bridge structure health monitoring and parameter identification. First, based on the measured vibration frequency of the cable structure, the initial value range of the cable force and the bending stiffness is determined by using a simplified analytical model; then a parameter space is constructed within the range, and candidate parameter combinations are generated by random sampling or distribution sampling; the corresponding theoretical frequency is calculated based on the W-W algorithm; the data items of the loss function between the measured frequency and the theoretical frequency are constructed, and the physical loss items of the loss function are constructed by using the vibration differential equation; the parameter inversion is carried out by combining global search and local optimization, and the adaptive interval contraction strategy is introduced to improve the calculation efficiency and the identification accuracy; finally, the optimal cable force and bending stiffness parameters are obtained. The method does not need to rely on the initial accurate parameters, has high robustness and engineering applicability, and can significantly improve the identification accuracy of the cable force and the stiffness.

The invention discloses an inner flange single-pipe tower local anti-bending and anti-shearing rigidity reinforcing device and method.The reinforcing device comprises an upper circular channel steel, a lower circular channel steel, structural ribs, an inner flange reinforcing rib connecting structure and a fixed prestress spring structure; the upper circular channel steel and the lower circular channel steel are connected through structural ribs; fixed prestressed spring structures are arranged in grooves of the upper circular channel steel and the lower circular channel steel; inner flange reinforcing rib connecting structures are arranged at the bottom of the upper circular channel steel and the top of the lower circular channel steel; the upper circular steel channel and the lower circular steel channel are each formed by splicing two C-shaped steel channels, and the two C-shaped steel channels are fixed through circumferential gap filling rubber. By means of the design, on the basis that the external structure of the inner flange single-pipe tower is not changed, the bending rigidity of the local dangerous section is improved, the shearing force of the dangerous section is reduced, and then the technical effect of enhancing the strength of the flange plates of the two-section single-pipe tower is achieved.

This invention discloses an XIE beam, comprising a box girder body, which is formed by an upper panel (1), a left web (2), a lower panel (3), and a right web (4). Inside the box girder body are scissor bracing plates (6) and horizontal steel plates (5). The two ends of the horizontal steel plates (5) are connected to the longitudinal midpoints of the left web (2) and the right web (4), respectively. The midpoint of the scissor bracing plates (6) is located at the transverse midpoint of the horizontal steel plates (5). The upper ends of the scissor bracing plates (6) are connected to the longitudinal 1 / 4 points of the left web (2) and the right web (4), respectively, and the lower ends of the scissor bracing plates (6) are connected to the longitudinal 3 / 4 points of the left web (2) and the right web (4), respectively. Compared to traditional box-section beams of the same area, the XIE beam significantly increases the bending stiffness EI without causing web instability.

The utility model relates to a bridge large cantilever flange plate reinforcing and supporting structure which comprises a bridge body and a cantilever arranged on one side of the bridge body. A light-weight supporting mechanism used for supporting the cantilever is arranged between the bottom of the cantilever and one side of the bridge body, the L-shaped supporting frame and the inclined supporting inclined rod form a triangular stable system, when the cantilever bears a vertical load, the load is transmitted to the bridge body through the supporting frame, the supporting inclined rod provides horizontal resistance, the bending moment of the root of the cantilever is remarkably reduced, and the stability of the cantilever is improved. Due to the high strength of the aluminum alloy material and the filling of the foam core material, it is ensured that the structure has enough flexural rigidity on the premise of light weight, local buckling is avoided, the supporting inclined rods are inserted into the corresponding mounting grooves of the supporting frame for positioning through the upper mounting base and the lower mounting base, final fixing is completed through the limiting pieces, and when the mounting bolts are screwed into the limiting sleeves, the supporting inclined rods are fixed. The sleeve presses the mounting base to be tightly attached to the mounting groove to form rigid connection, welding is not needed through the design, the pre-tightening force of the bolt is adjustable, and different load requirements are met.

The invention discloses a similar design method for an underwater vibration table test model of a reinforced concrete rectangular pier. The method comprises the steps of determining geometric similarity constants; determining an elastic modulus similarity constant, a longitudinal bar strength similarity constant, a stirrup strength similarity constant and a water density similarity constant of the reduced-scale pier; determining an acceleration similarity constant of the reduced-scale pier; determining a structural density similarity constant; determining a flexural rigidity similarity constant of the rectangular section of the reinforced concrete pier; determining the wall thickness of the reduced-scale pier with the hollow structure; determining the weight of the bridge pier in unit height and converting the weight into a mass block of an iron block or a lead block with the same weight; determining a longitudinal bar area similarity constant and a stirrup area similarity constant of the reduced-scale pier; and correcting the stirrup area similarity constant and the like. The method provided by the invention can provide a feasible method for similar design of the reinforced concrete rectangular pier model in an underwater vibration table test.

A purpose of the present invention is to provide a polyethylene terephthalate film for foldable displays and the like that have a sufficient elastic modulus in tension required of films for foldable displays and that has excellent flexural rigidity. Portable terminals or image display devices including, mounted therein, the polyethylene terephthalate film for foldable displays provide beautiful images, are highly functional, and have excellent convenience including portability and the like.　The polyethylene terephthalate film for foldable displays has an MD flexural rigidity Fa and a TD flexural rigidity Fb in terms of flexural rigidity for 15-μm thickness, the sum of Fa and Fb being 0.05 gf·cm2 / cm or greater, and has a longitudinal-direction elongation at break of 10% or higher and a width-direction elongation at break of 10% or higher. The poly ethylene terephthalate film can be folded along both a first bending direction and a second bending direction, which is orthogonal to the first bending direction.

This receptacle (1) comprises at least one gas-permeable element (2, 4) defining a part of a chamber (3) for an active substance (6). Each gas-permeable element (2, 4) has a base wall (20, 40) and a side wall (22, 42), the base wall (20, 40) comprising perforations (26, 46). The receptacle (1) further comprises a breathable member (5, 7) secured at its periphery in a receiving portion (25, 47) of the at least one gas-permeable element (2, 4) so as to cover the perforations. The breathable member (5, 7) is selected so that a ratio of a bending resistance of the breathable member (5, 7) to a length of insertion (l25, l47) of the breathable member in the receiving portion (25, 47) is between 10 N.m-1 and 100 N.m-1. In addition, an outer diameter of the breathable member (5, 7) is strictly higher than an inner diameter of the receiving portion (25, 47) so that, upon insertion of the breathable member (5, 7) into the receiving portion (25, 47), friction is established between a peripheral edge of the breathable member (5, 7) and an internal surface of the receiving portion (25, 47).

The invention relates to the technical field of switch rails, in particular to a production method of an elastic bendable switch rail for a compound dividing turnout, which comprises the following steps: determining the steel rail model of the switch rail according to the model of a stock rail; determining the machining range of the switch rail according to the steel rail model; precise cutting is conducted on the determined machining range through slicing machining, the horizontal inertia moment and the flexural rigidity of the switch rail are weakened, and an elastic bendable section is formed; the cut switch rail is subjected to precision verification; forging and pressing the point rail subjected to precision verification, and processing the section of the point rail into a common steel rail section consistent with that of the stock rail; the forged and pressed switch rail is cooled, straightened and detected, the switch rail produced through the method is stable and simple in structure, the problems that bolts are broken off, rail seams are eroded and the like are reduced, the reliability of the switch rail is improved, the service life of the switch rail is prolonged, and maintenance convenience of the switch rail is improved.

The utility model belongs to the technical field of medical instruments, and discloses a puncture guide wire which comprises a puncture body and a rigidity balancing sleeve. The puncture body comprises at least two first puncture sections which are connected in sequence, and in every two adjacent first puncture sections, the diameter of the first puncture section close to the far end of the puncture guide wire is smaller than that of the other first puncture section; the number of the rigidity balance sleeves is at least two, the rigidity balance sleeves correspond to the first puncture sections in a one-to-one mode, the corresponding first puncture sections are fixedly sleeved with the rigidity balance sleeves, and in every two adjacent rigidity balance sleeves, the outer diameter of the rigidity balance sleeve close to the far end of the puncture guide wire is larger than that of the other rigidity balance sleeve. The flexural rigidity of the rigidity balance sleeve close to the far end of the puncture guide wire is larger than that of the other rigidity balance sleeve. Puncture guide wires with different strengths do not need to be replaced repeatedly, so that the operation time is saved, and the operation risk is reduced. And the size of the included angle opening of the U-shaped puncture head cannot be increased along with the feeding of the puncture guide wire, so that the blood vessel is prevented from being burst.

The present application belongs to the technical field of industrial detection, and particularly relates to a forging round steel straightness online detection method based on point cloud data, which comprises the following steps: firstly, obtaining original point cloud and multi-dimensional physical characteristic data of the round steel in a transmission state; then, slicing the point cloud, and combining local geometric missing features and thermal deformation driving features to calculate a compensation step, and correcting a primary centroid to obtain a real three-dimensional physical axis; subsequently, projecting the axis to an orthogonal plane, and using a restriction relationship between local curvature and material bending stiffness to obtain a pseudo-boundary penalty factor, and then correcting an envelope angle and calculating a comprehensive straightness error. The present application eliminates the interference of point cloud missing, thermal eccentricity and surface microscopic defects, and improves the accuracy of the forging round steel straightness detection.

The application provides a new type of structure of a main tower in a multi-tower suspension bridge and a construction method thereof, which comprises a main tower, a plurality of oblique suspension cables, a first stiffening beam and a plurality of main cable saddles; the plurality of main cable saddles are vertically fixed on the top of the main tower in parallel and at intervals along the transverse direction of the main tower; the plurality of oblique suspension cables are respectively arranged on the two sides of the main tower in an inclined manner, the upper end of each oblique suspension cable is anchored in the lower bearing plate of the top of the main tower, and the lower end is connected to the corresponding first stiffening beam; and the first stiffening beam is arranged on the two sides of the main tower. The structure and the method utilize the components of the structure to improve the longitudinal bending stiffness of the main tower, do not affect the overall appearance of the whole bridge, are convenient for construction and do not increase the process.

The utility model discloses a truss floor support plate with high rigidity and heat preservation and sound insulation functions, and is characterized by further comprising a concrete rib poured on the top of the truss and inside the top of the truss and a heat preservation and insulation plate connected to the bottom of the concrete bottom plate. The utility model sets the concrete rib, pours it on the top of the truss, and forms a longitudinal connection support by wrapping the truss inside, thereby significantly improving the bending stiffness and load capacity of the floor support plate. During construction, the utility model can also reduce the establishment of support columns of the floor support plate, reduce construction operation time, and reduce construction cost. The setting of the heat preservation and insulation layer effectively prevents heat transfer, reduces building energy consumption, and meets building energy-saving standards. At the same time, the heat preservation and insulation plate and the overall structure of the floor support plate jointly act on sound propagation to achieve good blocking effect, create a quiet and comfortable environment inside the building, and are suitable for various places with high noise control requirements.

The invention provides a tunnel engineering reinforced pipe shed pipe and a construction method, and belongs to the technical field of tunnel construction, a pipe tip is arranged at one end of the head of a pipe tip section, a first longitudinal rib plate is arranged on the outer wall of the pipe tip section, a standard section is assembled and connected to the tail of the pipe tip section through a connecting pipe, and a second longitudinal rib plate is arranged on the outer wall of the standard section; the adjacent standard sections are assembled and connected through connecting pipes; the tail part of the standard section at the tail end is assembled and connected with a pipe top section through a connecting pipe, a third longitudinal rib plate is arranged on the outer wall of the pipe top section, and the tail part of the pipe top section is assembled and connected with a propelling grouting section through a connecting pipe. Through the steel pipe and longitudinal rib plate combined structure, the flexural rigidity and structural stability of a pipe shed supporting system are effectively improved, and therefore the problem that the strength and rigidity of an original independent steel pipe cement grout or steel pipe and reinforcement cage concrete combination are insufficient is thoroughly solved.

The application belongs to the field of high-stability anti-deformation folding pallets, and particularly relates to a high-stability anti-deformation folding pallet, which comprises a middle plate, the outer side of the middle plate is hingedly connected with two symmetrically distributed pallet plates, the inner side top of each pallet plate is fixedly installed with a fixing cover, and the inside of the fixing cover is slidably connected with a moving strip. Through the sliding insertion cooperation of the supporting pipe and the locking rod, a multi-point continuous supporting structure is established between the pallet plate and the middle plate, the traditional hinge force transmission mode is changed, the load is directly transmitted, the bending stiffness is significantly improved, the bearing deflection deformation is effectively inhibited, the radial constraint of the supporting pipe by the multiple linearly distributed locking rods and the reinforcing guide plate is cooperated to make the connection part have excellent bending moment capacity, and no cumulative deformation is generated under long-term heavy load or frequent folding, the problems of easy hinge loosening and permanent deformation are fundamentally solved, and the service life of the pallet is greatly prolonged.

The present application relates to the technical field of composite structure design, and particularly relates to a composite pipe bending stiffness prediction method based on deep learning, a system thereof and a terminal, the composite pipe bending stiffness prediction method comprising: testing the bending performance of a layer-laid composite pipe under cantilever beam conditions by using a finite element model to build a basic data set; processing the basic data set to obtain a standard data set; constructing a neural network model, training the neural network model by using the standard data set, and obtaining a pipe bending stiffness prediction model; and outputting the bending stiffness by using the model. By simulating the composite pipe simulation to obtain the data thereof, the preprocessed data is divided into layer-laid data and pipe geometry data as independent variables, and the bending stiffness as a dependent variable, a sample data set is made, a pipe bending stiffness prediction model is constructed, the pipe bending stiffness can be calculated by using the basic data, and the low-cost and fast and accurate design of the composite pipe is realized.

The utility model provides a combined steel beam structure, which comprises a channel steel group, a steel beam group and a steel beam group, the channel steel group comprises at least two channel steel units which are arranged at intervals, and each channel steel unit comprises two channel steel pieces which are arranged back to back; the connecting group comprises a plurality of viscous rubber blocks which are arranged between every two channel steel units at intervals; and the reinforcing group comprises a reinforcing web plate arranged on the inner side of the flange of the channel steel part and carbon fiber cloth arranged on the outer side of the channel steel group in a surrounding mode, and the carbon fiber cloth is matched with the arrangement position of the reinforcing web plate. Through interval combination of the back-to-back channel steel units and the viscous rubber blocks, a flexible-rigid alternate distribution structural system is formed, and the structural deformability is improved while the bearing capacity is guaranteed. Through the synergistic effect of the reinforcing web and the carbon fiber cloth, the flexural rigidity of the structure is improved, and meanwhile the stress concentration phenomenon caused by traditional welding stiffening ribs is reduced.

The utility model discloses a curtain wall structure based on integration of a decorative rib and a stand column and convenient to detach glass, and belongs to the technical field of curtain wall structures, hollow glass is fixedly installed on the two sides of the axis of an aluminum alloy side column base, and a first EPDM sealing rubber strip and a second EPDM sealing rubber strip are installed on the contact faces of the two sides of the hollow glass and the aluminum alloy stand column respectively. The contact face of the aluminum alloy side column base and the hollow glass is covered with an aluminum alloy decorative buckle cover, the curtain wall aluminum alloy stand column is designed in a stepped section mode, the section size is optimized according to the wind pressure and earthquake action dynamic simulation result, the bending rigidity is improved, the aluminum alloy stand column serves as a curtain wall core bearing component, and the section is designed in a customized mode. The aluminum alloy vertical column has the function of a vertical decorative rib, covers the edge of hollow glass and the outer side of an aluminum alloy side column base, adopts a buckle type connecting structure, and a stainless steel bolt group is used for connecting the aluminum alloy vertical column and the aluminum alloy decorative pipe, so that integration is formed, a mechanical transmission path is optimized, and the overall rigidity and safety are ensured.

The utility model relates to a high-strength roller bearing which comprises an inner ring, an outer ring, a cylindrical roller and a retainer, the outer ring is located on the outer side of the inner ring in the radial direction of the high-strength roller bearing, and the cylindrical roller is located between the outer ring and the inner ring in the radial direction of the high-strength roller bearing. The retainer is also located between the outer ring and the inner ring in the radial direction of the high-strength roller bearing and used for retaining the cylindrical rollers, the retainer comprises two oppositely-arranged supporting rings and a plurality of supporting beams used for connecting the two supporting rings, window holes used for installing the cylindrical rollers are formed between the two supporting rings and the two adjacent supporting beams, and the window holes are communicated with the cylindrical rollers. Reinforcing protruding parts in contact fit with the cylindrical rollers are arranged on the two sides of the supporting beam respectively, mounting faces in contact fit with the cylindrical rollers are arranged on the reinforcing protruding parts, and oil storage sinking grooves are formed in the mounting faces. According to the bearing, the bending rigidity of the retainer is improved through the reinforcing protruding parts on the two sides of the supporting beam, and the strength of the bearing is greatly improved.

The invention relates to the technical field of engineering, in particular to a tunnel deformation pressure calculation method and device. Comprising the following steps: S1, acquiring basic parameters of tunnel engineering, including tunnel burial depth, surrounding rock level and tunnel span; s2, according to the construction design, a preliminary bracing scheme of the tunnel is determined, the preliminary bracing scheme comprises sprayed concrete parameters and steel frame parameters, and the flexural rigidity of a preliminary bracing section is calculated; s3, based on the deformation pressure sample data, establishing a relation model between the deformation pressure and the surrounding rock level, the tunnel span and the initial support section flexural rigidity by adopting a multivariate nonlinear regression analysis method; s4, calculating the vertical deformation pressure of the tunnel supporting structure according to the relation model and the basic parameters, and calculating the horizontal deformation pressure; and S5, outputting the vertical deformation pressure and the horizontal deformation pressure. According to the method, the deformation pressure is calculated based on the basic parameters, accurate calculation of the stress state of the tunnel support is achieved according to multi-factor regression analysis and consideration of the support rigidity, and the design is more economical, reasonable, safe and reliable.

The utility model relates to a guide frame of a four-way reversing valve, which comprises a reinforcing piece, a left reinforcing plate and a right reinforcing plate are in split fitting design, the left reinforcing plate is fitted to the inner side of a left bent plate, and the right reinforcing plate is fitted to the outer side of a right bent plate, so that an inner and outer clamping effect is formed, and the flexural rigidity of a connecting part is greatly enhanced; meanwhile, the connecting and fixing part is inserted into the bending notch and is integrally connected with the reinforcing plates on the two sides, so that a stress transmission path is optimized, local stress concentration is avoided, and the overall anti-fatigue performance is improved; the reinforcing piece and the bending notch are matched in an inserted mode to further restrain deformation of the connecting part, the structural rigidity is enhanced, and vibration noise is reduced; the outer side wall face of the left bending plate is flush with the outer side wall face of the right reinforcing plate, it is guaranteed that the contact face of the left bending plate and the piston assembly is flat, assembling gaps are reduced, movement deviation is avoided, and guiding precision is improved. And by reinforcing and dispersing the load, the cracking risk of a bending area is remarkably reduced, the service life of the guide frame is prolonged, and the shutdown maintenance cost caused by failure of parts is reduced.

The invention discloses adjustable dredging equipment, which belongs to the technical field of hydraulic engineering and comprises a pump body and an extension arm. The extension arm comprises two segmental chain belts and two convolution discs, the segmental chain belts only have one-way winding freedom degrees, one ends of the segmental chain belts are matched with the pump body, the other ends of the segmental chain belts can be driven to be wound around the corresponding convolution discs, the two segmental chain belts are oppositely arranged, and the winding freedom degrees are opposite in direction. The segmental chain belt can form a continuous structure with certain axial rigidity in a specific direction when being unfolded, and can be wound and stored around the convolution disc when being retracted, so that the occupied space is small, and a large-range extension distance can be provided for the pump body. The two sectional chain belts can form symmetrical structures which interfere with each other and support each other in an unfolded state, stable truss type support can be formed, enough bending rigidity is provided for the pump body, the swing problem caused by flexible connection is avoided, and the underwater posture stability is improved.

The present disclosure relates to a plate, a sole, and a shoe. A plate (300) includes a curved portion (310) provided in a forefoot region and having a shape curved in a convex manner toward a flat surface, a midfoot portion support portion (320) provided in a midfoot region, and a rearfoot portion support portion (330) provided in a rearfoot region. The curved portion (310) has a wide-width region including a wide-width portion having a largest dimension in a width direction among the curved portion (310). The midfoot portion support portion (320) has a narrow-width region including a narrow-width portion having a smallest dimension in the width direction among the midfoot portion support portion (320). A ratio of a flexural rigidity of the narrow-width region to a flexural rigidity of the wide-width region is 0.4 or more and 0.85 or less.

The utility model relates to wood -plastic mould technical field, especially a kind of wood-plastic mould frame structure with composite reinforcing rib, including machine table, the top surface fixed mounting of machine table has extrusion pipe, the output end of extrusion pipe is fixedly installed with mould main body by bolt, the axis of extrusion pipe and mould main body coincides.The utility model has the advantages that after accurate positioning by positioning pin and the positioning hole of mould main body, only need to disassemble connecting bolt to quickly separate and assemble frame and mould main body.The first reinforcing rib of stainless steel material provides superhigh strength support, the second reinforcing rib of aluminium alloy material is further lightened in weight by slot design, and the composite reinforcing rib system formed by the combination of the two makes the overall structure weight lightened while improving bending stiffness.This modular design not only facilitates the separate replacement and recycling of assembly frame, and its dissimilar metal composite structure more effectively suppresses resonance phenomenon, especially suitable for high-frequency vibration extrusion working condition.

A backpack type assembly may include a backpack type carrier configured to be worn by a user and a device configured to be attached to the backpack type carrier. The backpack type carrier may include a pair of shoulder straps configured to be worn on both shoulders of the user, a back plate to which the pair of shoulder straps and the device are attached, a waist belt configured to be wrapped around a waist of the user, and a connection mechanism configured to connect between the back plate and the waist belt. The connection mechanism may include an elastic member having a flexural rigidity smaller than a flexural rigidity of the back plate. A force applied to the connection mechanism from one of the back plate and the waist belt may be transmitted through the elastic member to the other of the back plate and the waist belt.