150 results about "Rigid rod" patented technology

The invention provides a compression-torsion coupled metamaterial cell element and a negative Poisson's ratio energy absorption structure composed of the compression-torsion coupled metamaterial cell element, and relates to the technical field of compression-torsion energy absorption metamaterials. The cell element comprises an upper connecting plate assembly and a lower connecting plate assembly, an upper-layer four-rod tensioning assembly and a lower-layer four-rod tensioning assembly are arranged between the upper connecting plate assembly and the lower connecting plate assembly, each of the upper-layer four-rod tensioning assembly and the lower-layer four-rod tensioning assembly comprises four compression rigid rod pieces and a plurality of tension elastic bodies, the compression rigid rod pieces are staggered in space to form a quadrangular prism-like frame, and the tail ends of the upper compression rigid rod piece and the lower compression rigid rod piece are hinged; adjacent hinge points and two corresponding corners of the surfaces of the upper connecting plate assembly and the lower connecting plate assembly are connected through tensile elastic bodies and apply pre-tightening force; the energy absorption structure is formed by combining a plurality of cell element arrays, and the negative Poisson's ratio effect is achieved by regulating and controlling the arrays. According to the cell element, a tensioning structure is integrated into a metamaterial configuration, the cell element has the compression-torsion coupling characteristic, the non-localized deformation response of the structure is achieved, and the energy absorption structure has the negative Poisson's ratio effect and provides excellent bearing and impact resistance through an efficient energy absorption mechanism.

The invention relates to a Stewart six-dimensional force sensor, six branch chain rods distributed in an inclined manner are arranged between an upper platform and a lower platform, each branch chain rod comprises an upper rigid rod, an upper cross flexible hinge, a measuring unit, a lower cross flexible hinge and a lower rigid rod which are sequentially connected from top to bottom, the upper rigid rod is fixedly connected with the upper platform, and the lower rigid rod is fixedly connected with the lower platform. And the lower rigid rod is fixedly connected with the lower platform. A calibration device is used for calibrating a Stewart six-dimensional force sensor. The invention relates to a Stuart six-dimensional force sensor calibration method, which comprises the steps of off-line calibration and training and on-line measurement and calculation. The Stewart six-dimensional force sensor has the advantages of being large in rigidity, high in bearing capacity, stable in structure, fast in dynamic response, high in precision, good in isotropy and the like, and solves the problem that a traditional linear algorithm cannot process complex nonlinear errors. The measurement precision is reduced due to serious inter-dimensional coupling; and the complexity of a high-precision model is too high and the high-precision model is difficult to run in real time in an embedded system.

The invention discloses an unmanned ship lake and reservoir vertical stratified sampling and in-situ water quality monitoring device and method. The unmanned ship lake and reservoir vertical stratified sampling and in-situ water quality monitoring device comprises an unmanned ship platform, a reducing guide rod structure and a water sample in-situ collecting and monitoring device. The advantages of light weight, hardening, easy combination and the like of the variable-diameter guide rod are exerted, and the problems that a traditional soft rope is easy to swing, and a drift-diameter hard rod is large in size, insufficient in strength and the like are solved; aiming at the problems of easy breaking of a through rod, deviation of a monitoring point and the like caused by lake flow disturbance and the like in the traditional operation, a determination method of key parameters such as the number of segmented guide rod sections, a diameter critical threshold value and the diameter of the guide rod is determined by combining with the vertical flow velocity of the lake and the reservoir, and a basis is provided for stable and accurate operation; aiming at the problems of easy mixing (mixing with water samples in different layers and mixing with air in a bottle) and the like in traditional lake and reservoir vertical water sample in-situ collection, the invention provides a water sample layering in-situ collection device and method, anaerobic collection is realized through a double-pipe reverse replacement system, a method for determining the length difference delta L of an exhaust pipe and a water inlet pipe is defined, and equipment parameter support is provided for efficient and reliable collection.

The present invention relates to the technical field of robot compliant motion system design, and discloses a hinge-driven bistable wheel-leg conversion mechanism, comprising a bistable structure having two stable states: a wheel shape and a leg shape. The bistable structure comprises a frame and a first drive module. The frame comprises a plurality of spokes distributed in an array, a hinge and a pseudo-rigid rod are provided between the ends of two adjacent spokes, and the hinge is connected to the first drive module. The hinge bends and deforms under the positive action of the first drive module, and the bistable structure is converted from a wheel shape to a leg shape. When the first drive module stops acting, the hinge returns to its original state, and the bistable structure returns from a leg shape to a wheel shape. The stiffness of the pseudo-rigid rod is greater than the stiffness of the hinge. The present invention can undergo flexible deformation when encountering obstacles, thereby adapting to various unstructured terrain environments and having better buffering and energy absorption characteristics.

The invention relates to a fastening device (100) for a seat belt buckle (52), comprising: - a loop (110) including a clasp (112) adapted to receive said buckle, - a rigid stem (120), and - a sliding mounting system (101) for the clasp (112) along said stem, which is adapted to block said sliding when a tensile force (F1) exceeding a threshold is exerted on the clasp. According to the invention, the sliding mounting system comprises: - a sleeve (111) coupled to the clasp and housing the stem, - a means for coupling the sleeve to a seat base, - two clamping means (140) located on either side of the stem and movable between a clamping position of the stem and a rest position in which the stem can slide relative to the sleeve, and - means for returning the clamping means to the rest position. Figure for the abstract: Fig. 2

The application provides an extendable anchor rod based on a three-dimensional concave polygon structure, which comprises a rigid rod body and a three-dimensional polygon structure arranged on the outer side of the rigid rod body, the three-dimensional polygon structure comprises a plurality of fold line type anchor cables which are connected with each other; when the rock mass deforms and causes the rigid rod body to break, the three-dimensional polygon structure can extend along the direction of the rigid rod body, thereby achieving multi-section rock mass anchoring. The application can realize elastic anchoring of the multi-section rock mass along the radial direction of the rod body, and is suitable for surrounding rock anchoring under different stress and deformation conditions of the multi-section rock mass.

The utility model discloses profile steel stacking adsorption equipment, which belongs to the field of profile steel stacking and comprises a working frame, a movable block slidably connected to the inner wall of the top of the working frame, a protective shell fixedly connected to the bottom of the movable block, two first connecting rods rotatably connected to the bottom of the protective shell, and second connecting rods rotatably connected to the other ends of the two first connecting rods. Third connecting rods are rotationally connected to the other ends of the two second connecting rods, fourth connecting rods are rotationally connected to the other ends of the two third connecting rods, a same connecting roller is rotationally connected between the two fourth connecting rods, and two long connecting rods are rotationally connected to the two sides of the connecting roller. The lifting device is reasonable in structural design, the long connecting rods, the short connecting rods, the first roller and the flat plate are matched, the lifting device can be achieved through the multiple connecting rods, and due to the fact that the connecting rods are composed of the rigid rod pieces and the hinges and are simple in structure, the manufacturing and maintaining cost of a user is lower, and the user can use the lifting device conveniently.

The application discloses a kind of overhanging roadbed structure and construction method, belong to high fill section deep soft soil roadbed engineering technical field.The roadbed structure includes pipe pile support structure, leveling layer, shear layer and pavement structure layer, the leveling layer and shear layer are both foam concrete pouring layer, the pipe pile contains one or more lengths, and can be spliced.The construction method includes that after pipe pile is implanted foundation, first rough leveling is carried out by pipe pile, then fine leveling is carried out by leveling layer, the leveling layer and shear layer are both poured and constructed by the working face of temporary platform, batten board construction and the formwork of rigid bar piece, the leveling layer, shear layer and reinforced layer are used to transmit structure dead load and live load to pile cap and pipe pile.The roadbed structure and construction method of the application do not need to cut pile, have excellent structure durability and are economical and practical.

This invention relates to the field of concrete reinforcing fiber technology, and discloses an environmentally friendly cellulose fiber-based composite material for shotcrete and its preparation method. The composite material consists of twisted fiber bundles, locally cured rigid rod-shaped non-water-soluble resin, multi-directional raised short fibers attached to its surface, and an overall water-soluble resin layer. When this composite material is mixed into concrete, it initially enhances workability through uniform dispersion, and later, the dense fiber network promotes cement hydration, significantly improving the overall performance and durability of concrete. It is particularly suitable for shotcrete, improving the alkali resistance, durability, ease of mixing, uniform dispersion, and workability of cellulose fibers in concrete.

The invention relates to a method and an apparatus (1) for additive manufacturing of a 3D item (2) by means of fused deposition modeling of a composite material, whereby the composite material is fed through a heated printer extruder head (4) and deposited on a printer bed (3) as a layer arrangement that form the 3D item (2). The composite material is provided as at least one rigid rod (10) that is conveyed out of a rod magazine (9) that is capable of storing at least one rigid rod (10). The rigid rod (10) is then conveyed through a guide tube (15) that is arranged within the printer extruder head (4), whereby the rigid rod (10) is heated during the conveyance through the guide tube (15), and whereby the heated and viscous composite material is discharged through a discharge nozzle (16) at one end of the guide tube (15) and deposited as the layer arrangement onto the printer bed (3) to generate the 3D item (2).

The present application belongs to the technical field of bridge wind tunnel test device, and provides a kind of wind tunnel test device simulating nonlinear vibration of bridge structure, including rigid model, rigid rod, rigid circular arc suspension arm, linear tensile spring, nonlinear elastic element and light high-strength fine rope.Nonlinear elastic element can adopt cable structure, membrane structure, nonlinear tensile spring, mechanical super material or superstructure.By designing the nonlinear stiffness characteristics of nonlinear elastic element, the layout mode and the combination mode of linear tensile spring, various target nonlinear stiffness modes can be realized to carry out large amplitude vertical torsional coupled flutter test of bridge structure under nonlinear stiffness.In the process of large amplitude vibration of model, the center hanging point of nonlinear elastic element and linear tensile spring can always maintain vertical displacement and deformation, and the device can ensure stable stiffness, damping, mass and mass moment characteristics.

A cupholder and phone mounting system for use in a golf bag comprising a golf club compartment and golf bag legs. The system comprises a shaft sub-assembly comprising a rigid rod configured to be removably installed into the golf club compartment alongside clubs in that golf bag, and a cupholder part. The cupholder part comprises a slot configured to hold a camera phone at an angle configured to permit recording of a golf shot. A fastener slot forms an angle between the cupholder and the shaft subassembly when connected such that the cupholder remains approximately vertical while the rigid rod of the shaft sub-assembly is inserted into the golf club compartment of the golf bag and the golf bag is stood on the golf bag legs.

The flexible mechanical arm comprises a connecting arm, a driving device and a plurality of flexible units, each flexible unit comprises a rigid rod piece I and a rigid rod piece II, a plurality of rigid rod pieces I are arranged at intervals in the axial direction of the rigid rod piece II and form a plurality of rotating arms, the connecting arm is arranged on the rigid rod piece II in a running fit mode, and the connecting arm is arranged on the rigid rod piece II in a running fit mode. The adjacent flexible units are connected in series through the connecting arms, the driving devices are used for driving the rotating arms and the connecting arms to rotate up and down, flexible movement of the mechanical arm is achieved in the mode that the connecting arms, the driving devices and the multiple flexible units are controlled in a segmented mode, the complexity and the control method of the flexible mechanical arm structure are increased, and the flexibility of the structure is enhanced. Good flexibility can be obtained only through simple rope driving.

Device for measuring the relationship between force, speed and power during locomotion in the unloaded and overloaded state, characterized in that it comprises a hydraulic system arranged to generate resistance (overload) for an athlete in motion using the device, wherein the hydraulic system comprises - two hydraulic fluid cylinders (29) each with a threaded piston rod (31) and a piston (30) connected to hydraulic fluid separators (26), wherein the said hydraulic fluid cylinders (29) are connected to a housing, - a housing in which a hydraulic fluid flows through a system of channels and the aforementioned hydraulic fluid cylinders (29) and separators (26), wherein the channels are provided with pressure adjusting elements (25, 34, 35, 37) arranged to define a constricted area of ​​the channel system, wherein the pressure adjusting element (25) is used to regulate the repulsive force generated by the hydraulic system, - two opposing hydraulic transmission gears (32) connected to the piston rod (31), and a main transmission gear (33) connected to a rope cylinder (6), wherein when the rope cylinder (6) rotates, the main transmission gear (33) rotates the hydraulic transmission gears (32), thereby generating a flow of fluid in the hydraulic system, - an adjustment mechanism for adjusting the magnitude of the repulsive force, wherein the adjustment mechanism includes inside a channel that accommodates a rigid rod (34) arranged to press on a spring (37) to increase or decrease the repulsive force generated by the hydraulic system by influencing the force required to move the hydraulic fluid through the system, - a hydraulic pressure sensor (2) which is appropriately attached to the housing of the hydraulic system and which makes it possible to provide quantitative information about the pressure in the hydraulic system.

The invention relates to a hammer type pile foundation horizontal bearing capacity testing device and method, and aims to provide a simple, accurate and economical solution for testing the ocean pile foundation horizontal bearing capacity. The device is connected with the pile foundation through the hammer ball, horizontal load application is achieved, and the bearing capacity of the pile foundation under different horizontal loads is measured. The device mainly comprises a weight throw, a rigid rod, a driving device, a displacement and tension measuring device and a control system. The weight ball is connected with the pile foundation, the weight ball moves around the pile through the driving device to generate horizontal force, and the movement direction and the load of the weight ball are controlled; the displacement and tension measuring device monitors the horizontal displacement and the horizontal force of the pile foundation in real time, and the control system adjusts the load according to feedback data and records test information. According to the testing method, the horizontal bearing capacity of the pile foundation in the marine environment is simulated by accurately controlling the motion path and the load of the hammer, the stability and the bearing performance of the pile foundation are effectively evaluated, and the testing method is suitable for ocean engineering pile foundation performance detection.

The present invention relates to the field of robotics, and in particular to a large-angle five-degree-of-freedom hybrid robot, comprising a frame; a static platform disposed on the frame; a fixed platform disposed on the frame; a dynamic platform disposed between the static platform and the fixed platform; a support column disposed between the static platform and the fixed platform; a terminal swing head disposed on the dynamic platform; a linear drive module disposed on the support column; a linear drive module disposed on the static platform; a rope module disposed on the static platform, the movable end of the rope module being connected to the terminal swing head; an articulated assembly, one end of which is connected to the movable end of the linear drive module and the other end is connected to the dynamic platform; and an end effector disposed on the dynamic platform. The large-angle five-degree-of-freedom hybrid robot of the present invention utilizes a rope module to replace a portion of the rigid rods, effectively reducing the robot's own weight and inertia, and facilitating simplified control. The use of a pair of flexible ropes with consistent rope lengths realizes two rotational degrees of freedom of the terminal swing head, and the rotation angle is much larger than that of traditional robots. It has good application prospects in the fields of sorting and assembly.

The utility model belongs to the technical field of industrial equipment, and particularly relates to a hard rod extension type endoscopic device which comprises an installation rod, a moving assembly, a rotating assembly and a detection lens. The rotating assembly is arranged at the output end of the moving assembly; the detection lens is arranged at the output end of the rotating assembly; wherein the moving end of the moving assembly slides to a preset position along the length direction of the mounting rod, and the rotating assembly drives the detection lens to circumferentially rotate at the preset position. A hard rod is adopted as a supporting structure, multi-axis adjustment can be achieved when deep well structure detection is carried out, the interior of a shaft can be detected from multiple angles, practicability is greatly improved, and product competitiveness can be improved.

The application relates to a pendulum adjustable collision test device in a horizontal pressure cylinder and a use method thereof. The device comprises a horizontally arranged pressure cylinder, and the pendulum adjustable collision test device comprises a base, front and rear frames with the same size and arranged at intervals in front and back directions are respectively arranged at the front end and the rear end of the top surface of the base, and the front and rear frames are connected and fixed into an integrated frame through a cross beam; a plurality of limiting components are respectively arranged at intervals in the circumferential direction on the front and rear frames, and the end portions of the limiting components are in abutment with the inner wall surface of the pressure cylinder; a telescopic rigid rod is downwardly and rotatably arranged at the top of the integrated frame, the end portion of the telescopic rigid rod is fixed with a heavy ball, and a pressure-resistant electromagnetic suction component is further arranged at the top of the integrated frame behind the telescopic rigid rod; the heavy ball swings backward with the telescopic rigid rod as a radius, the heavy ball is adsorbed by the pressure-resistant electromagnetic suction component in the electric state, and the heavy ball swings forward to hit the test model in front after losing the electric state, so that the test of the structural response of a pressure-resistant structure under the collision impact load under the hydrostatic pressure effect is carried out.

A portable chair featuring a unique combination of elements for enhanced utility and comfort. The chair includes a sealable five-gallon plastic bucket with a lid, encased in an insulated fabric sheath with a bottom panel and an annular wall panel forming a cavity for the bucket. A pivotal seat portion is attached to the bucket's lid, which includes a rigid panel with a threaded aperture, a seat pad, and a fabric panel enveloping the seat pad. The seat pivots via a threaded fastener passing through the lid's aperture. Additionally, the chair is equipped with shoulder straps and an adjustable padded hip belt. The chair features a pair of rigid telescoping poles, configurable in extended or storage positions, which allows the chair to transition from a compact, backpack-like configuration to a functional seating arrangement, meeting both storage and comfort needs.

The utility model discloses an integral stress photovoltaic flexible support of a fast-assembly limiting structure, which comprises a plurality of groups of steel strand stress structures which are arranged in parallel to form a flexible stress unit, the flexible stress unit comprises a first steel strand and a second steel strand which are parallel to each other, and a plane formed by the first steel strand and the second steel strand forms an inclination angle with a horizontal plane; a full-length rigid rod piece is arranged below the direction perpendicular to the steel strand, the full-length rigid rod piece is in a U shape, turnups are arranged at the tops of two side wings of the U shape, and quick mounting holes are formed in the turnups. The first steel strand is directly installed on the upper surface of the full-length rigid rod piece through a pressing plate. An elevated supporting component is arranged at the intersection of the horizontal projection of the second steel strand and the upper surface of the full-length rigid rod piece, the bottom of the elevated supporting component is directly connected with a quick mounting hole in the full-length rigid rod piece, and the top of the elevated supporting component is connected with the second steel strand through a pressing plate to form a limiting structure; and the relative position of the steel strand under the wind load effect is limited.

The invention provides a curtain airbag assembly and a vehicle including the same. The curtain airbag assembly includes an inflator, an inflatable curtain airbag, and a rigid rod. The inflatable curtain airbag includes a pocket portion and a body portion extending from the pocket portion. The pocket portion defines one or more pockets and a plurality of cutouts spaced apart from each other in a vehicle longitudinal direction of the pocket portion. The main body portion, upon activation, receives gas from the inflator and expands. A rigid rod extends through the one or more pockets and is received within a plurality of receiving members mounted to a body member of the vehicle to secure the curtain airbag assembly to the body member.

A pressing member (1) for a pressing unit of a sintering press for carrying out the sintering of electronic components onto a substrate, comprising a rigid stem and a pressing foot (12) connected to one end of the rigid stem (10). The pressing foot is made of a soft material so as to adapt to the geometric conformation of the electronic component to be pressed and protrudes axially from said end of the rigid stem both in an undeformed resting configuration and in a working deformed configuration in which it is subjected to a predetermined pressing pressure.

A curtain airbag assembly includes an inflator, an inflatable curtain airbag, and a rigid bar. The inflatable curtain airbag includes a pocket portion and a body portion extending from the pocket portion. The pocket portion defines one or more pockets and a plurality of cutouts spaced apart from one another along a vehicle longitudinal direction of the pocket portion. The body portion inflates upon receiving gas from the inflator when activated. The rigid bar extends through the one or more pockets and is received within a plurality of receiving members mounted to a vehicle body member of a vehicle, thereby securing the curtain airbag assembly to the vehicle body member.

This invention discloses a high-precision flow field sensor and measurement method with a multi-stage flagella structure inspired by mosquito antennae. The biomimetic flow field sensor consists of a central rigid rod and two multi-stage cantilever sensors on both sides. The cantilever sensors are composed of a flexible bottom layer, a flexible top layer, and a piezoresistive flexible sensor. The central rigid rod provides fixation and support for the multi-stage cantilever sensors. The flexible bottom layer is made of a high-elastic-modulus material and mainly senses changes in airflow in the surrounding flow field, oscillating with the airflow. The flexible top layer is made of a low-elastic-modulus material and mainly enhances the sensitivity of the rigid front section to changes in airflow. The piezoresistive flexible sensors are distributed on a secondary cantilever beam composed of the flexible bottom and upper layers. The oscillation of the secondary cantilever beam causes deformation of the two layers of piezoresistive flexible sensors, thereby changing the sensor resistance value. By comprehensively evaluating the resistance change of the piezoresistive flexible sensors, information such as the flow direction, flow rate, and velocity of the airflow in the flow field can be accurately measured.

The invention belongs to the technical field of bridge wind tunnel test devices, and provides a wind tunnel test device for simulating nonlinear vibration of a bridge structure, which comprises a rigid model, a rigid rod, a rigid arc suspension arm, a linear extension spring, a nonlinear elastic element and a light high-strength string. The nonlinear elastic element can adopt a cable structure, a membrane structure, a nonlinear extension spring, a mechanical metamaterial or a superstructure. Various target nonlinear rigidity modes can be realized by designing the nonlinear rigidity characteristics and the arrangement mode of the nonlinear elastic elements and the combination mode of the nonlinear elastic elements and the linear extension springs, so that a large-amplitude vertical torsion coupling flutter test under the nonlinear rigidity of a bridge structure can be carried out. In the large-amplitude vibration process of the model, the central lifting point of the nonlinear elastic element and the linear extension spring can always keep vertical displacement and deformation, and the device can ensure stable rigidity, damping, mass and mass moment characteristics.

The utility model belongs to geotechnical engineering technical field, specifically discloses a kind of layered settlement measuring device of split press-in type magnetic ring. The multi-jack of the device is fixed at the bottom end of hydraulic pump, and the horizontal push slide plate is horizontally coaxially fixed at the bottom of multi-jack, and the split magnetic ring is a rigid rod with a pointed end at one end, and the pointed end is outwardly slidingly placed on the horizontal push slide plate, and the end away from the pointed end is respectively abutted with the corresponding multi-jack piston rod, the boom is vertically arranged and the bottom end is fixedly connected with the hydraulic pump, and the oil pipe is communicated with the oil port of the hydraulic pump at one end and communicated with the ground hydraulic system at the other end. The utility model sets horizontal push slide plate at the bottom end of multi-jack, and slidingly places each split magnetic ring pointed end outward on the horizontal push slide plate, and pushes each split magnetic ring into the soil body of drill hole to form settlement magnetic ring sleeve by the piston rod of multi-jack to monitor layered settlement, with the characteristics of simple structure, easy operation, accurate monitoring data and wide adaptability to strata.

The invention relates to the technical field of concrete reinforced fibers, and discloses an environment-friendly cellulose fiber-based composite material for sprayed concrete and a preparation method of the environment-friendly cellulose fiber-based composite material. The composite material is composed of twisted fiber bundles, non-water-soluble resin locally solidified into a rigid rod shape, multi-direction tilting short fibers attached to the surface of the non-water-soluble resin and a water-soluble resin layer covering the whole. When the composite material is mixed into concrete, the construction performance is enhanced through uniform dispersion at the initial stage, and the fiber structure is dense and netty and promotes cement hydration at the later stage, so that the comprehensive performance and durability of the concrete are remarkably improved. The alkali resistance and durability of the cellulose fiber in the concrete are improved, and the cellulose fiber is easy to stir, uniform to disperse, easy to construct and the like.

This utility model is a multi-functional manipulator for downhole operations, including a gripper (1), a flexible contact pad (2), several connecting arms (3), several telescopic rods (4), and a rotating base (5). The rotating base (5) is set on the working surface. The connecting arms (3) are rigid rods that are linearly hinged to each other. The two ends of the telescopic rods (4) are respectively hinged to two adjacent connecting arms (3). One free end of the connecting arm (3) is connected to the output end of the rotating base (5), and the other end is connected to the gripper (1). The contact surface of the gripper (1) is provided with a flexible contact pad (2). The multi-functional manipulator for downhole operations described in this utility model adopts an elastic structure, so that the contact surface and contact point of the clamped structure are within an adjustable range, in order to cope with the use scenarios of clamping non-standard products.

The application discloses a special-shaped grading roller with adjustable grading effect, which comprises a middle shaft and a plurality of net-shaped sieve surfaces, all the net-shaped sieve surfaces being combined to form a cylinder body arranged around the middle shaft; the net-shaped sieve surface is flexible, and a rigid rod is arranged between the edges of adjacent net-shaped sieve surfaces; the special-shaped grading roller further comprises an adjusting mechanism, which can act on all the rigid rods to make all the rigid rods move close to or away from the middle shaft in the radial direction of the middle shaft. In the application, the rigid rods are close to or away from the middle shaft under the action of the adjusting mechanism, the bending degree of the net-shaped sieve surface can be changed, the shape of the whole cylinder body can be changed, the material in the special-shaped grading roller is changed under the action of the special-shaped grading roller when the special-shaped grading roller rotates around the middle shaft, the distribution state of the material in the special-shaped grading roller can be changed, and the adjustment of the grading effect and the grading efficiency can be realized.