258results about How to "Guaranteed stiffness" patented technology

The invention discloses a robot leg structure and a humanoid robot. The robot leg structure comprises a hip joint assembly, thighs and shank assemblies, and the hip joint assembly is used for being connected to the lower portion of the trunk of the humanoid robot; the thigh part comprises a first thigh web and a second thigh web which are oppositely arranged in the Y direction, the first thigh web and the second thigh web are detachably connected into a whole, and a mounting cavity is defined between the first thigh web and the second thigh web; the hip joint assembly is rotationally connected into the mounting cavity along the lower end of the Z direction; the upper end of the shank assembly is rotationally connected to the end, deviating from the hip joint assembly, in the mounting cavity in the Y direction. A first driving assembly is arranged in the mounting cavity and used for driving the shank assembly to rotate in the Y direction. The walking stability of the humanoid robot is improved on the premise of meeting the movement flexibility of the humanoid robot.

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 electro-plastic plate shape control roller system capable of being independently controlled in a transverse partition mode, which belongs to the technical field of plate strip rolling equipment and comprises a plate shape control roller mandrel, a conductive copper ring, an insulating ceramic ring, a damping rubber sleeve, an insulating ceramic roller sleeve, a conductive swivel joint and the like. According to the system, the conductive copper rings and the insulating ceramic rings which are alternately arranged form a transverse partition electro-plastic plate shape control roller, the strip is wrapped above the electro-plastic plate shape control roller at a certain wrap angle during working, tight contact of the strip and the conductive copper rings is ensured, and the strip shape control roller is controlled by utilizing the principle that the resistance of the conductive copper rings, the strip and the adjacent conductive copper rings is minimum. The external control circuit is used for controlling the on-off of each group of independent conductive copper rings, so that the electric heating effect is realized at different positions along the width direction of the strip, the plastic state of the strip entering a rolling deformation area is changed, the rolling pressure of the deformation area is influenced, and finally the purpose of online regulation and control of the strip shape is realized.

The utility model discloses a photovoltaic support structure of a super-large span cable-stayed string truss combined system, which comprises a space net-shaped truss suspended above a spanning area and tower column foundations arranged at two ends of the spanning area, the tower column foundations are pre-buried and fixed underground, and tower column bodies are mounted on the tower column foundations. Each tower column body is provided with a plurality of stay cables, the stay cables are connected with the spatial net-shaped truss, and the spatial net-shaped truss is used for laying photovoltaic panels. According to the utility model, the tower column body and the stay cables on the tower column body are mutually connected with the string truss, so that the rigidity of the structure is ensured, the large-span requirement of more special sites can be met, and the popularization and application of the photovoltaic technology are facilitated.

The invention provides a flexible braided electrode and an electrochemical polishing method for a complex inner channel, and belongs to the technical field of electrochemical machining. The flexible braided electrode is formed by mutually braiding a plurality of flexible conductive wires and a plurality of flexible insulating wires according to a certain interval, the diameter of the insulating wires is larger than that of the conductive wires, and steps with a certain height are naturally formed between the insulating wires and the conductive wires, so that short-circuit burn caused by contact between the conductive metal wires and an inner channel can be avoided, mass transfer can be enhanced, and product discharge can be accelerated; the flexible woven electrode is of a hollow net-shaped cylindrical structure, internal and external compound flushing can be achieved, and the flushing effect is improved. During polishing, the flexible braided electrode can be bent and deformed in a bent inner channel in a self-adaptive manner, internal and external compound flushing is performed by utilizing the internal and external through characteristic, and electrochemical polishing of the complex inner channel is realized by combining rotation and reciprocating motion of the electrode. The invention provides the flexible braided electrode with ingenious conception, and the flexible braided electrode is supplemented with an innovative process method, so that high-efficiency and high-quality finishing of a complex inner channel can be realized.

The utility model discloses cigarette packaging paper. The cigarette packaging paper comprises an inner part, an outer part, a release layer (105) and an adhesive sticker layer (106), wherein the release layer (105) and the adhesive sticker layer (106) are arranged between the inner part and the outer part; the outer part sequentially comprises an outer PE (polyethylene) lamination layer (101), an outer paper layer (102), an outer composite adhesive layer (103) and an outer PET (polyethylene terephthalate) layer (104); the inner part sequentially comprises an inner PET layer (107), an inner composite adhesive layer (108), an inner paper layer (109) and an inner PE lamination layer (110); the release layer (105) is close to the outer PET layer (104), and the adhesive sticker layer (106) is close to the inner PET layer (107). According to the utility model, the outer PE lamination layer and the inner PE lamination layer are respectively laminated on the outermost layer and the innermost layer of the packaging paper to form the double-sided laminated paper, so that the leakproofness and the barrier property of the paper are effectively improved. The pressure relief device is arranged at the bottom of the packaging box, so that the problem that the whole packaging box swells due to the fact that the sealing performance of the packaging box is improved is solved.

The invention discloses a full-size wind tunnel high-load blade, which relates to the technical field of wind tunnel equipment and comprises a metal blade root, a hollow main beam and a blade body, a main beam connecting section is arranged at one end of the metal blade root, and the side wall of the main beam connecting section is a first conical side wall surface; the large opening end of the first conical side wall face is closer to the end, provided with the main beam connecting section, of the metal blade root than the small opening end of the first conical side wall face. The hollow main beam is formed by wrapping a carbon fiber cloth layer; a blade root connecting section is arranged at one end of the hollow main beam and fixedly arranged on the main beam connecting section in a sleeving mode. The inner side wall of the blade root connecting section is a second conical side wall face, and the second conical side wall face is attached to the first conical side wall face. The blade body is made of a carbon fiber material; and the blade body is fixedly arranged on the hollow main beam. The lightweight design degree of the blade is improved, and the lightweight effect of the blade structure is achieved.

The invention belongs to the technical field of spaceflight, and particularly relates to a large-aperture spatial columnar deployable film light shield. According to the technical scheme, the large-caliber space columnar unfoldable thin film light shield comprises an unfoldable supporting mechanism and a thin film, the unfoldable supporting mechanism has the axial folding and unfolding functions, and the shape of the unfoldable supporting mechanism in the unfolding state is an irregular dodecagonal cylindrical surface with the upper portion beveled; the thin film is connected with the inner side of the extensible supporting structure and is folded and unfolded in the axial direction along with the extensible supporting structure. The large-aperture spatial columnar deployable film light shield provided by the invention can meet the development requirements of complex optical equipment, large field of view and wide band of an optical system, light weight of a deployable structure and high storage rate.

The invention discloses a six-dimensional force sensor, which relates to the field of sensor technology. The outer end of the radial beam is connected to the middle of the floating beam to form a "T" beam; each beam is evenly distributed in the circumference, and its radial beam is arranged along the radial direction, and the floating beam is arranged vertically, and the inner end of each radial beam is connected to the center platform; the top and bottom ends of each floating beam are respectively fixedly connected to the circumferential support, and the center platform and the circumferential support are provided with positioning holes; the radial beam is provided with a radial beam vertical through hole penetrating its upper surface and lower surface and a radial beam transverse through hole penetrating its two side surfaces, and the floating beam is provided with a floating beam transverse through hole penetrating its two side surfaces; strain gauges are arranged on both sides of the radial beam vertical through hole, the radial beam transverse through hole and the floating beam transverse through hole. The sensor of the present invention is provided with transverse through holes and vertical through holes on each radial beam, and transverse through holes on each floating beam, so that the strain on the beam is concentrated on both sides of each through hole, which can effectively improve the resolution of the sensor while ensuring the rigidity of the sensor.

The present invention discloses a novel sandwich structure automobile front anti-collision beam and assembly, the anti-collision beam comprises a tubular aluminum alloy shell, the shell is provided with aluminum foam, two-layer lattice structure and honeycomb structure inside, the honeycomb structure is filled between the two-layer lattice structure, the two-layer lattice structure comprises a first lattice structure arranged on a side away from the automobile, the first lattice structure comprises a plurality of interconnected first unit cells in the shape of a structure, and the aluminum foam is filled in the gap between the two-layer lattice structure and the inner wall of the shell. The present invention has the advantages of absorbing impact energy, reducing impact peak force and being conducive to achieving lightweight of automobiles.

According to the electric tilting helicopter wing, a flap steering engine end adjusting support is connected with a middle hinge structure of a flap conversion rocker arm, one end of a flap control surface connecting rocker arm is connected with the right end of the flap conversion rocker arm, and the other end of the flap control surface connecting rocker arm is connected with a flap control surface fixing connector; the aileron steering engine root mounting frame is located on the wing rib, and a single lug of the aileron steering engine root mounting frame is connected with double lugs of the aileron steering engine root; a middle fixing frame of the aileron steering engine is positioned on the rear beam, and two sides of the aileron steering engine are respectively arranged on the wing ribs; an aileron steering engine end adjusting support is connected with the rear beam, and an aileron steering engine end double-lug connector is connected with the left end of an aileron conversion rocker arm; an aileron steering engine end adjusting support is connected with a middle hinge structure of an aileron conversion rocker arm, one end of an aileron control plane connecting rocker arm is connected with the right end of the aileron conversion rocker arm, and the other end of the aileron control plane connecting rocker arm is connected with an aileron control plane fixing connector. A force transmission path of bending, twisting and shearing loads caused by concentrated mass of aerodynamic loads, a transmission system and a rotor system is provided, and the strength and rigidity of the flap and aileron steering engine connecting structure are guaranteed.

The present invention discloses a planetary gear reducer with a large-caliber hollow structure, which solves the problem that when the existing planetary gear reducer is applied to a robot, the robot's cables cannot be built-in, resulting in a large device volume, and the existing reducer has a large axial size and weak rigidity. The reducer uses an end cover to axially position the planetary wheel of the first-stage planetary gear reduction mechanism, the current-stage planetary carrier axially positions the planetary wheel bearing, and the upper-stage planetary carrier axially positions the first external tooth of the next-stage sun wheel. At the same time, the same-stage planetary wheel and the planetary carrier directly contact each other to achieve mutual axial positioning; the reducer realizes power input from one side and output from the other side through the cooperation between the hollow sleeve, the input gear and the sun wheel of the first-stage planetary gear reduction mechanism, and the internal cavity of the hollow sleeve, the central through hole of each stage sun wheel and the through hole set in the center of the planetary carrier are connected in sequence, thereby forming a hollow structure for passing the line.

The invention discloses a circular saw blade base body provided with a vibration reduction inner cavity and a method, solves the problem that the rigidity of a saw blade is reduced due to the arrangement of a vibration reduction groove of the saw blade in the prior art, and has the beneficial effects of effectively absorbing vibration and improving the rigidity of the saw blade. Comprising a first saw blade body and a second saw blade body, the inner side face of the first saw blade body is connected with the inner side face of the second saw blade body, and a damping groove is formed in the inner side face of at least one of the first saw blade body and the second saw blade body so that a circular saw blade base body can be provided with a damping inner cavity; the depth of the vibration reduction grooves is smaller than the thickness of the first saw blade body or the second saw blade body, and when the first saw blade body and the second saw blade body are provided with the vibration reduction grooves, the shapes of the vibration reduction grooves are the same or different, and the arrangement modes of the vibration reduction grooves are the same or different. The first saw blade body and the second saw blade body are both provided with vibration reduction grooves, and when the first saw blade body and the second saw blade body are in butt joint, the vibration reduction grooves are arranged in a staggered mode.

The invention relates to the technical field of foundation pit construction, in particular to a composite foundation pit water stopping and supporting structure system under the complex geological condition and a construction method thereof.The water stopping and supporting structure system sequentially comprises a slope protection structure and a foundation pit water stopping and supporting structure from outside to inside, and the slope protection structure comprises a foundation pit cement soil stirring wall, stand columns and a reinforced concrete spraying layer; the foundation pit water retaining supporting structure comprises a front composite wall, a wall heel plate, a wall toe plate and a rear drilling pouring row pile, and the slope protection structure and the foundation pit water retaining supporting structure jointly form a foundation pit support suitable for the complex geological conditions with soft soil and hard soil layers and close to a gentle slope. The strength of the slope protection structure is further improved through stand columns and a reinforced concrete spraying layer, an h-shaped supporting structure is formed by a front composite wall, a wall heel plate, a wall toe plate and rear bored cast-in-place piles, the characteristics of a cantilever retaining wall and cast-in-place piles are combined, the cast-in-place piles permeate into the ground, loads are applied to one side of a soil body through filler, the bending strength is improved, and the slope protection effect is improved. The adaptability to complex geology is greatly improved, and in a complex foundation of soft soil, the protection structure and a soil body are of a synergistic structure, so that the stability and the overall rigidity of the foundation pit and the protection structure are guaranteed.

Multi-source sensing fusion laser powder bed fusion five-axis additive and subtractive composite equipment comprises a machine tool base of a laser powder bed, a gantry type machining platform is connected to the machine tool base, and a sealing cover body is connected to the gantry type machining platform; a swing head sliding table is installed on an XY-axis movement mechanism on the gantry type machining platform, and the five-axis material reducing process is achieved. A galvanometer sliding table is installed on an XY axis movement mechanism on the gantry type machining platform, and laser scanning is conducted on the laser powder bed to achieve the laser powder bed material adding process. Large-angle five-axis additive and subtractive composite manufacturing on the powder bed is achieved through the combination of the gantry type three-axis movement mechanism and the A / C-axis swing head type electric spindle, and the rigidity of the movement mechanism is guaranteed; real-time monitoring of acoustic, mechanical and optical signals and the like in the part additive and subtractive machining process is achieved through various types of sensors, and the comprehensive quality of the part machining process and the finished part machining process is predicted.

The invention relates to the technical field of fan blade design, and discloses a hollow fan blade and a design method and system thereof. Aerodynamic load, temperature load and vibration load data of an air inlet side and an air outlet side of an adjustable blade of a fan stator under a to-be-analyzed working condition are used as working condition loads; carrying out topological optimization on the adjustable blade optimization area of the fan stator; adjusting the artificial pseudo density of the optimization area in the optimization process to obtain the topological optimization configuration of the optimization area, and finally selecting the topological optimization configuration of the fan stator adjustable blade with the maximum first-order inherent frequency and the minimum flexibility under the to-be-analyzed working condition from the topological optimization configuration of the optimization area as the design area topological structure of the fan stator adjustable blade. And an auxiliary support is added to the topological structure, and the framework structure of the fan stator adjustable blade optimization area of a hollow structure is formed. On the basis of ensuring the strength and the rigidity, the weight of the blade can be obviously reduced, and the maximum displacement of the blade tip and the vibration fundamental frequency can be ensured to meet the design requirements.

The electrically-driven bulldozer frame comprises a frame assembly, a connecting column is arranged at the front end of the frame assembly, a balance beam mounting frame is arranged in the middle of the frame assembly, a rear axle box is arranged on the rear portion of the frame assembly, the frame assembly comprises frame bodies which are symmetrically arranged, and the two ends of the balance beam mounting frame are connected into the frame bodies in an embedded mode; the rear axle box comprises a left shell and a right shell, and the left shell and the right shell are connected through a front panel, a rear panel, a top plate and a bottom plate to form a box body structure. A connecting pipe and a pivot mounting base are arranged in the rear axle box, the two ends of the connecting pipe are connected with the left shell and the right shell respectively, the pivot mounting base and the bottom plate are integrally arranged, and the two ends of the pivot mounting base are connected with the left shell and the right shell respectively; guide rails are symmetrically connected to the inner sides of the bottoms of the left shell and the right shell; an inlet-outlet for the guide rails to slide outwards is formed in the bottom of the rear panel; a mounting access hole is formed in the top plate; and an opening is formed in the connecting pipe. The system can meet the use requirement of a new energy vehicle frame, and can meet the arrangement requirement of a large number of electrical elements and pipelines.

The invention discloses a rear floor assembly and a vehicle, and relates to the technical field of vehicles. The rear floor assembly comprises a rear longitudinal beam, the cross section of the rear longitudinal beam is in a hollow frame shape, and a first opening is formed in the bottom wall of the rear longitudinal beam. An opening in the bottom end of the mounting cylinder is connected with the first opening, so that the shock absorber is inserted into the mounting cylinder from the lower part of the rear longitudinal beam to be fixed; the connecting plate is fixedly arranged between the top of the mounting cylinder and the top wall of the rear longitudinal beam and extends in the width direction of the rear longitudinal beam, and the connecting plate comprises a fixing part connected with the top of the mounting cylinder in an attached mode and an extending part attached to the inner surface of the top wall of the rear longitudinal beam. The mounting cylinder is mounted on the bottom wall of the rear longitudinal beam, the performance requirement of a rear suspension system can be met, the space of a trunk can be guaranteed, the connecting plate is arranged between the top of the mounting cylinder and the top wall of the rear longitudinal beam, and the overall strength, rigidity and fatigue resistance of the rear longitudinal beam can be guaranteed.

A detachable electromagnetic heating mold for in-situ curing of composite materials, the present invention relates to an electromagnetic heating mold, the present invention is to solve the problems of uneven heating temperature control, low efficiency and potential safety hazards in the mold in the prior art, and to realize the winding in-situ curing molding process of pressure vessel-shaped products, it includes a spindle clamping end, a mold shell and an electromagnetic coil mandrel; one end of the mold shell is fixedly connected to the spindle clamping end, the fixed end of the electromagnetic coil mandrel is fixedly connected to the other end of the mold shell, and the heating part of the electromagnetic coil mandrel is inserted in the mold shell. The present invention belongs to the field of composite material processing.

According to the installation tool for the fixed cone lining plate of the gyratory crusher, the gyratory crusher is provided with a conical shell, a lining plate lifting lug is arranged on the lining plate, and the installation tool comprises a ring grid steel frame capable of being placed into an inner cavity of the conical shell; a mounting platform is arranged at the bottom of the ring grid steel frame; mounting units are distributed in the circumferential direction of the ring grid steel frame; each mounting unit comprises a mounting piece which can be clamped and matched with the corresponding lining plate lifting lug and is used for hanging the corresponding lining plate on the outer side of the ring grid steel frame, and a positioning piece which corresponds to the mounting piece and is used for pressing the lining plate on the mounting surface of the inner wall of the conical shell in an abutting manner. According to the fixed cone lining plate mounting tool for the gyratory crusher, each layer of lining plate can be integrally mounted at one time, the mounting period is greatly shortened, and the downtime of the crusher is reduced, so that the economic benefit is improved.

The utility model discloses a connector for inner and outer leaf wall steel bars of a sandwich masonry wall, which comprises a thin steel sheet which can be bent to be used for connecting embedded steel bars of an inner leaf wall and full-length steel bars or meshes in mortar joints of an outer leaf wall, and two end parts of the thin steel sheet are respectively provided with a first hole groove and a second hole groove; the fixing assembly comprises a screw rod and a nut, the screw rod penetrates through the first hole groove and the second hole groove, and the nut is used for tightening the screw rod so as to fix the thin steel sheet; the first hole groove and the second hole groove are thickened; wherein the size of the thin steel sheet is matched with the diameter and the required length of the connected reinforcing steel bar. The structure is simple, the horizontal full-length horizontal steel bars or meshes in mortar joint mortar of the outer wall body are connected with the embedded steel bars on the inner wall body, and the stability, wind resistance and shock resistance of the outer wall body are guaranteed.

The invention discloses an electric heavy truck and a frame assembly thereof, and belongs to the technical field of vehicle bearing systems. The frame assembly comprises two longitudinal beams arranged oppositely and a plurality of cross beams connected between the two longitudinal beams in a crossing mode. Wherein the longitudinal beams are integral beams, and the cross beams are arranged at intervals in the extending direction of the two longitudinal beams; the battery frame is connected with at least two cross beams arranged at intervals through connecting pieces, the battery frame is of a frame structure defined by a first rod body extending in the X direction, a second rod body extending in the Y direction and a third rod body extending in the Z direction, the X direction is the front-back direction of the frame, the Y direction is the left-right direction of the frame, and the Z direction is the up-down direction of the frame; the at least two second rod bodies of the battery frame are located under the cross beams connected with the second rod bodies; a closed ring beam structure is defined by the cross beams, the connecting pieces and the battery frame. The design requirements for rigidity and light weight can be met.

The invention belongs to the technical field of plunger pumps, and provides a split block detachable pump head with butt joint type plunger sections. A split block detachable pump head with butt joint type plunger sections comprises a pump head body and a pump body, plunger rods are arranged in the pump head body and the pump body, each plunger rod comprises a first plunger section and a second plunger section which are connected, the first plunger sections and the second plunger sections are both located in the pump body, and nesting parts are arranged at the joints of the first plunger sections and the second plunger sections. The nesting part is provided with a radial connecting hole, and a first fastener is arranged in the radial connecting hole. By adopting the arrangement, the interior and the exterior of the plunger pump can be fully disinfected and washed; the nested parts are axially staggered, so that the bearing capacity of the axial load and the radial load of the first plunger section and the second plunger section can be improved, and the overall rigidity of the plunger rod is improved; the relative positions of the second plunger section and the first plunger section are positioned through the radial connecting holes, and it can be guaranteed that the volume efficiency of the plunger pump is kept stable.

The invention relates to the technical field of mold opening and closing devices, and particularly discloses a hydraulic-electric hybrid drive connecting rod type injection molding machine mold opening and closing device which comprises a head plate, a second plate, a tail plate, a mold and a power mechanism, a pull rod is arranged between the head plate and the tail plate, and the second plate is movably arranged on the pull rod between the head plate and the tail plate. The die comprises a fixed die fixed on the head plate and a movable die fixed on the second plate, the power mechanism is fixed on the tail plate and connected with the second plate, the power mechanism comprises a plunger cylinder, a servo motor, a ball screw and a hydraulic power unit, the ball screw and a plunger are integrated in a cylinder barrel, the plunger is driven to translate through rotation of the ball screw, and the hydraulic power unit is connected with the plunger cylinder. By means of the structure, the requirement for mold opening and closing control precision can be met, after mold closing, high-pressure oil can be introduced into a rodless cavity of the plunger type cylinder through the hydraulic power unit, the plunger is used for further driving the second plate to be attached to the head plate, the requirement for mold clamping force can be met, the integration degree is high, the overall occupied size is small, and cost is low.

The utility model relates to a sinking courtyard stair structure which is fixed on an outer wall of a sinking courtyard and comprises a middle frame, stair plates and a platform plate. The middle frame is arranged on one side of the sinking courtyard outer wall in parallel, one sides of the platform plates are connected with the middle frame, the other sides of the platform plates are connected with the sinking courtyard outer wall, the platform plates are distributed on the two sides of the middle frame in a staggered mode, and the stair plates are fixed to the left side and the right side of the middle frame and distributed on the front side and the rear side of the middle frame in a crossed mode. The two ends of the stair plates are connected with the platform plates on the two sides of the middle frame respectively. Compared with the prior art, the utility model has the advantages of reasonable and safe acceptance system, simple structure, wide application range and the like.

The invention discloses a clinker silo and a layout method thereof. Bending prestressed tendons are arranged at the edge of a door opening, and lintels and buttresses are arranged around the door opening, so as to effectively avoid stress concentration at the door opening due to over-dense anchoring of prestressed tendons. By arranging plum blossom-shaped prestressed tendons below a silo wall ring beam, it is possible to avoid excessive local pressure in a silo wall section due to over-dense distribution of prestressed tendons, while ensuring that the prestress meets design requirements. The strength weakening of the silo wall caused by opening a hole is effectively reduced, the strength and rigidity of the structure are ensured, the stress concentration phenomenon near the hole opening is alleviated, and the safety and reliability of the structure are improved.

The present invention discloses an ellipse trajectory generating device. Based on the ellipse parameter equation, the whole device is composed of an x-direction motion mechanism, a y-direction motion mechanism, a parallelogram mechanism, an end actuator, a frame and a verification plate. The x-direction motion mechanism and the y-direction motion mechanism are both crank slider mechanisms. The main sliders are composed of three parts of rigid connection, namely, a starting slider, a connecting rod and a terminal slider. The distance between the starting slider and the terminal slider determines the offset distance between the center of the ellipse and the origin of the coordinates. The parallelogram mechanism ensures that the cranks of the two crank slider mechanisms can rotate at the same angle and angular velocity, thereby satisfying the conditions of the ellipse equation and driving the terminal actuator to generate an ellipse trajectory. Since the ellipse trajectory is generated in free space and is not affected by the size of the ellipse radius, the lengths of the two cranks can also be adjusted independently, and the required ellipse trajectory can be generated with great flexibility. This instrument can be used in teaching instruments or ellipse trajectory processing and other fields.

This invention belongs to the field of industrial UV inkjet printing consumables technology, specifically relating to a UV white inkjet ink, its preparation method, and its application. The UV white inkjet ink contains aliphatic polyurethane acrylate, silane-modified epoxy polyester, reactive diluent monomer, photoinitiator, adhesion promoter, white pigment, and optional additives. The silane-modified epoxy polyester is prepared by the following method: esterification of a diol compound with itaconic acid, followed by a mercapto-olefin click reaction of the resulting unsaturated polyester polyol with mercaptosilane, and then a condensation reaction of the resulting silane-modified polyester polyol with halopropylene oxide to obtain the silane-modified epoxy polyester. The UV white inkjet ink provided by this invention has high adhesion to the substrate and is not easily peeled off after handling friction and outdoor exposure.