530 results about "Triangular prism" patented technology

The invention provides a quasi-zero-stiffness base and an adjustable quasi-zero-stiffness local resonance super-structure vibration isolation device, belongs to the field of environmental vibration reduction and isolation in traffic engineering and civil engineering, and aims at solving the problems that in the prior art, a spring quasi-zero-stiffness structure is complex in installation structure and poor in structural stability. The device comprises a bottom plate, a plurality of first beams with a positive stiffness effect, a plurality of second beams with a negative stiffness effect and a plurality of regular triangular prisms, the first beam, the second beam, the regular triangular prism and the bottom plate are integrally formed, on one hand, it is ensured that all connecting pieces are in rigid connection, the situation that connecting points affect the stability of the structure is avoided, on the other hand, the assembling process can be simpler, and the assembling efficiency is improved.

The utility model provides a centrifugal filter-pressing sludge dewatering structure, which comprises a shell, a Lurox triangular prism, a limit frame, a support structure and a driving device, the lower end of the shell is provided with a discharge port and a feed pipe, the inner wall of the shell is fixedly provided with a filter-pressing filter cartridge, the bottom of the side wall of the shell is provided with a plurality of water filtering holes, the feed pipe is slidably connected with the shell, and the limit frame is fixedly connected with the support structure. A material containing cavity and a centrifugal cavity are formed in the Lurox triangular prism, a feeding port, a water outlet and a discharging port are formed in the bottom of the Lurox triangular prism, a telescopic device is fixedly connected to the top of the material containing cavity, a scraper blade is fixedly connected to a telescopic shaft, the limiting frame is fixedly installed in the shell, and the supporting structure is fixed to the inner wall of the shell. The driving device drives the Lurox triangular prism to rotate in the shell, the bottom surface of the shell is in sliding connection with the inner wall, the pushing device is fixedly mounted on the bottom surface of the shell, centrifugal dewatering and filter-pressing dewatering are synchronously performed by adopting the same device, the water content of the sludge is further reduced, and the dewatering efficiency is improved.

The invention relates to the technical field of cleaning equipment, in particular to an underwater cavitation jet observation experiment device and method based on a triangular reflector, and the device comprises a jet control device, an impact observation device, a plurality of light source assemblies and a high-speed camera. The spraying control device comprises a nozzle, and external high-pressure water flow is sprayed out downwards from the nozzle after passing through the pump pipe; the impact observation device comprises a clamping device. The clamping device comprises a triangular prism reflector and a support used for placing the triangular prism reflector. A shot picture of the high-speed camera can simultaneously comprise a free jet flow area and a jet flow impact area reflected by the triangular prism reflector. According to the double-angle free cavitation jet flow observation device, the three-edged reflector is utilized, cavitation flow evolution of a free jet flow area of cavitation jet flow and a jet flow impact area reflected by the three-edged reflector can be observed at the same time, and double-angle free cavitation jet flow observation is achieved.

The invention relates to the technical field of liquid cooling heat dissipation, in particular to a liquid cooling heat dissipation structure based on a bionic microchannel and a preparation method of the liquid cooling heat dissipation structure based on the bionic microchannel, and the liquid cooling heat dissipation structure comprises a liquid cooling plate main body, a turbulent flow generation assembly and a gradient heat sink composite layer, the fractal bionic micro-channel comprises a main channel and at least four stages of branch channels, and the last-stage branch channel is distributed in a logarithmic spiral line mode; the turbulent flow generation assembly is composed of triangular prisms and hemispherical pit arrays which are arranged in a staggered mode. The gradient heat sink composite layer comprises a diamond-containing copper composite matrix and a surface micro-nano structure. The bionic micro-channel structure is combined with the micro-channel with specific parameters, an efficient substance transmission system in a living body is simulated, the flowing uniformity of cooling liquid is optimized, generation of local hot spots is reduced, and the overall heat dissipation performance is improved.

The spherical four-glued prism is formed by gluing and connecting three triangular prisms and a curved prism, each gluing surface is plated with a functional film, each non-gluing surface is plated with an anti-reflection film, the outer diameter position of the curved prism is coated with black extinction paint, and the outer diameter position of the curved prism is coated with the black extinction paint. The curved prism can be arranged on any side of the three triangular prisms; the processing technology of the spherical four-cemented prism comprises the following steps: 1) preparing a light blank; 2) plating a first light splitting film, combining, polishing, plating a second light splitting film, combining and polishing in sequence; the method comprises the following steps of (1) preparing a curved prism, (2) cutting the curved prism to form a green body with a specified size, (3) cutting to form a green body with a specified size, (4) pasting an auxiliary lens, (5) processing a spherical surface, (6) removing the auxiliary lens, and (7) plating an antireflection film on the spherical surface, and coating the outer diameter of the curved prism with black matting paint The prism prepared by the method is compact in structure, excellent in performance, high in processing precision and small in gluing deviation, and can realize low-cost and batch production and universalization of a jig at the same time.

Described herein are calibration jigs and methods used to design and fabricate calibration jigs as well as associated workflows that may be used for determining the calibration parameters used to create a 2D image of a 3D scene, wherein the calibration jig has the shape of an isosceles right semi-triangular prism and is configured to ergonomically fit an anterior-medial tibial position on a patient's leg.

The embodiment of the invention discloses a detection system and method for a battery cell clamping needle, and the detection system comprises a camera and a visual upper computer. The camera is used for collecting a to-be-detected image; the to-be-detected image is an image imaged on the triangular prism after the light source lights the end face of the cell clamping needle plated with the fluorescent material and the end face of the standard block; the visual upper computer is used for acquiring a to-be-detected image acquired by the camera on the detection station; and performing defect detection on the to-be-detected image to obtain a detection result of the to-be-detected image, and sending the detection result to the controller. According to the embodiment of the invention, the light source is used for lighting the end face of the cell clamp needle and the end face of the standard block which are plated with the fluorescent material, the camera is used for collecting images of the end face of the cell clamp needle and the end face of the standard block on the triangular prism, and the fluorescent material can enhance the contrast, so that details of the end face of the cell clamp are more easily captured; therefore, the definition and accuracy of the to-be-detected image are improved.

The utility model discloses a foundation pit supporting and reinforcing device which comprises a base and a supporting plate fixedly connected to one end of the top of the base, the supporting plate is perpendicular to the base, a right-angle triangular prism is fixedly connected to the connecting position of the base and the supporting plate, and sliding seats are arranged on the surface of the base and the surface of the supporting plate in a sliding mode. Two sliding seats are arranged on the base, a supporting rod with the adjustable length is arranged between the two sliding seats, sliding blocks are arranged at the two ends of the supporting rod in a sliding mode, and reinforcing supporting columns with the adjustable angles are arranged at the bottoms of the two sliding blocks. Effective supporting is achieved, a soil body on the side wall of the foundation pit is prevented from sliding or collapsing, the length adjustable function of the supporting rod allows flexible adjustment according to the actual depth of the foundation pit and the height of the supporting plate, and the supporting device is suitable for supporting of a standard foundation pit and can also be adjusted and adapted according to the specific condition of the foundation pit.

A clip may include a shaft, an overhead, and an underhang. The shaft are located on and perpendicular to a base. The overhead is on and supported by the shaft and is triangular prism-shaped. The underhang is attached to the overhead. The underhang and the base secure a spare fuse.

The utility model discloses a three-row column bearing inner ring and outer ring assembling platform, and relates to the technical field of bearing production, the three-row column bearing inner ring and outer ring assembling platform comprises a base, a plurality of clamping pieces, a plurality of limiting pieces and an adjusting piece, the clamping pieces are arranged on the upper surface of the base, the limiting pieces are arranged on the upper surface of the base, the limiting pieces are arranged on the upper surface of the base, and the adjusting piece is arranged on the base. The adjusting piece is arranged in the middle of the lower surface of the base. According to the three-row-column bearing inner and outer ring assembling platform, through the ingenious design of the adjusting piece and the limiting piece, the positions of the limiting columns can be flexibly adjusted so as to meet the row column limiting requirements of bearings of different specifications. Meanwhile, the clamping piece can move on the dovetail sliding groove and is adjusted in a self-adaptive mode through the spring, bearing outer rings of different sizes are clamped and limited in the middle through the triangular prism-shaped rubber clamping head, and compared with an existing tool which can only assemble cylindrical roller bearings of a single type specification, the adaptability to bearings of various types and specifications is greatly improved, and the assembling efficiency is improved. And diversified production requirements are met.

The invention discloses a miniature ultraviolet spectrometer, which comprises a light source assembly, a miniature collimating lens group, a triangular prism, a parallel glass plate, a cylindrical lens and an area array detector, the light output end of the light source assembly faces the incident plane of the miniature collimating lens set, and the emergent plane of the miniature collimating lens set faces the first face of the triangular prism. The emergent surface of the triangular prism is in close contact with the incident surface of the parallel glass plate; the emergent surface of the parallel glass plate faces the incident surface of the cylindrical lens, and is used for refracting light rays close to a total reflection critical angle to form a plurality of light beams; the emergent surface of the cylindrical lens faces the receiving end of the area array detector; and the area array detector processes the received interference fringes to obtain spectral information. According to the micro ultraviolet spectrograph provided by the embodiment of the invention, the light path structure of the spectrograph is simplified, the simplified structure can reduce the loss of light in the transmission process, and more light can reach the detector, so that the accuracy of spectral information is ensured.

The invention provides a control method and device of cleaning equipment and the cleaning equipment, and relates to the technical field of cleaning equipment, the cleaning equipment comprises a sewage tank, a first light conduction structure and a first optical sensor, the first light conduction structure is arranged at the bottom of the sewage tank, and at least the top end part in the vertical direction is of a triangular prism structure; the first optical sensor is located below the first optical conduction structure in the height direction of the first optical conduction structure, and the first optical sensor comprises a first transmitting end used for transmitting an optical signal into the first optical conduction structure and a first receiving end used for receiving the optical signal emitted by the first optical conduction structure; determining a first liquid level height in the sewage tank based on the first optical sensor and the first light conduction structure in the process that the cleaning equipment executes the cleaning task in the upright inclined state; under the condition that the first liquid level height is larger than or equal to a first threshold value, water fullness alarm information is generated. The liquid level height in the sewage tank is detected by using an optical detection principle, so that the detection reliability is improved.

The invention discloses a cell sorting micro-fluidic chip and application, the micro-fluidic chip is obliquely arranged on an inclined plane, the micro-fluidic chip comprises a substrate, the substrate is provided with a slender groove with a triangular prism profile, and a micro-fluidic channel is embedded in the slender groove; the upper end and the lower end of the inclined surface respectively face the center and the edge of the turntable; one side of the microfluidic channel back to the substrate is parallel to the upper surface of the substrate, one end of the microfluidic channel is communicated with the fluid buffer cavity, the other end is communicated with the sorting channel, and the other end of the sorting channel is communicated with the plurality of sorting sub-channels; a soft magnet is further arranged on the microfluidic channel, and a permanent magnet is arranged on one side, back on to the microfluidic channel, of the soft magnet. According to the invention, two-parameter sorting of preferential separation of magnetic microspheres according to density and accurate positioning according to size can be realized, high-flux and high-precision two-parameter sorting is realized, the resolution is greatly improved, the energy consumption is low, and the device is suitable for portable equipment.

The utility model provides a waterproof wire duct device for an engineering construction site, which relates to the technical field of cable protection devices and comprises a wire duct shell, a cover plate and two end plates. The trunking shell comprises a back plate and a bottom plate, the trunking shell is fixed on the surrounding baffle, the two end plates are fixed at the two ends of the trunking shell, and the cover plate is fixed on the trunking shell. The waterproof wire duct device has the beneficial effects that the waterproof wire duct device is of a triangular prism structure with a protective cavity, a plurality of wire duct plates are fixed in the wire duct shell, wire clamping grooves are formed in the wire duct plates, and a plurality of cables can be fixed in the protective cavity in parallel through the wire clamping grooves, so that all the cables are arranged at intervals, and the risk of short circuit of the cables is reduced; according to the waterproof trunking device, the cable can be fixed on the outer side of the surrounding baffle, the closed structure can protect the cable, the cover plate is obliquely arranged relative to the back plate, the water guiding characteristic of the cover plate can be greatly improved, rainwater is prevented from flowing into the protection cavity, and therefore it is guaranteed that the waterproof trunking device has the good waterproof characteristic.

Provided is an optical film requirement that does not use fine particles for light diffusion, is entirely composed of a transparent resin, and has a self-moire pattern that cannot be visually recognized by the naked eye, said optical film requirement having high front brightness without luminance unevenness on the light emission surface of a backlight when mounted on an edge-light backlight. A light-collecting auxiliary film inserted between the light emission surface of a light guide plate and the light incidence surface of a brightness enhancement film (BEF) in an edge-light backlight unit using discrete LED point light sources, the light-collecting auxiliary film being characterized by comprising: an optical waveguide layer comprising a light-transmitting base film, and a light-collecting layer comprising a light-transmitting base film, the light-collecting auxiliary film being interposed between the light emission surface of the light guide plate and the light incidence surface of the brightness enhancement film (BEF), the light-collecting auxiliary film being interposed between the light-emitting surface of the light guide plate and the light incidence surface of the brightness enhancement film (BEF); a light extraction layer that is formed on one surface of the optical waveguide layer and has a plurality of inverted rectangular pyramid-shaped unit recesses; and a light introduction layer formed on the other surface of the optical waveguide layer and having a plurality of unit triangular prisms extending in parallel in one direction, the light extraction layer constituting a light emission surface, and prism surfaces of the plurality of unit triangular prisms constituting the light introduction layer constituting a light incidence surface. The direction of the ridge lines of the plurality of unit recesses and the direction of the ridge lines of the plurality of unit triangular prisms intersect at an angle of 42 DEG to 48 DEG, and the light extraction layer, the optical waveguide layer, and the light introduction layer do not contain fine particles for light diffusion. The self-moire pattern generated by the plurality of unit recesses and the plurality of unit triangular prism lenses cannot be visually recognized by naked eyes.

The present invention discloses a double-clad fiber pump return filter, which relates to the technical field of fiber amplifiers and fiber lasers. The filter includes an input fiber collimator, a triangular prism, a supporting glass tube, a filter, an output fiber collimator, and a bridge glass tube; the supporting glass tube is fixedly installed in the middle position inside the bridge glass tube, and the triangular prism and the filter are respectively fixedly installed at both ends of the supporting glass tube; the input fiber collimator and the output fiber collimator are respectively inserted into the two ends of the bridge glass tube and fixed after optical debugging; the present invention uses the dispersion effect to cause the transmission angles of the pump light and signal light transmitted on the same optical fiber to deviate, and then the residual pump light can be returned to the original path while maintaining high return loss of the signal light, effectively improving the utilization efficiency of the pump light and having positive significance for improving the conversion rate of fiber amplifiers and fiber lasers.

A solar heliostat with pneumatic flow guide load shedding and friction damping vibration attenuation functions comprises a main beam, a plurality of auxiliary beams perpendicularly fixed to the main beam, a connecting piece fixed to the main beam, a plurality of inclined struts connecting the connecting piece and the auxiliary beams and the like. The supporting rod is fixed to the main beam, the friction damper is installed at the tail end of the supporting rod, the steel cables are connected with the friction damper, the main beam and the auxiliary beam respectively, and the triangular-prism-shaped covering body wraps the inclined struts in an attached mode. The friction damper comprises a friction base body, a friction element connected with a steel cable, a pressing plate matched with a friction concave surface of the friction base body to clamp the friction element, a pressure adjusting structure A for adjusting the pressing force of the pressing plate, a guide roller for guiding the steel cable connected with the friction element, and a pressure adjusting structure B for adjusting the tension force of the connected steel cable, according to the invention, airflow separation is guided to reduce the wind load through the prism aerodynamic configuration on the back of the heliostat; the friction force of each friction element and the pre-tightening force of the connected steel cable are independently set, the outer rigidity of the heliostat surface is enhanced, wind disturbance vibration is reduced, and the service optical precision is improved.

The utility model belongs to the technical field of kitchen utensils, and relates to a vertical kitchen utensil storage box with a partition function, which comprises a storage box main body and a box cover, a box cover storage groove is arranged in the box cover, and a storage box storage groove is arranged in the storage box main body; the box cover is in a triangular prism shape, and the storage box main body is in a quadrangular prism shape with a trapezoidal cross section, so that after the box cover is closed, the box cover storage groove is opposite to an opening of the storage box storage groove, and the storage box main body and the box cover can form a straight parallelepiped storage box; and the length of one outer side wall on the box cover is equal to that of one outer side wall on the storage box main body, so that after the box cover is opened, the storage box main body can be supported on the box cover in a laterally inclined manner. Compared with the prior art, the storage box has the advantages that after the storage box is opened, the box cover serves as a support of the storage box body, the storage box is obliquely erected on the plane, the kitchenware can be conveniently taken, the storage space in the box can be freely distributed through the partition plates and the inserting grooves, the kitchenware with different purposes can be placed in a classified mode, and the storage box has wide application prospects.

The application discloses a kind of muon track detector design and performance evaluation method, it is related to the field of detector structure design;Two kinds of scintillator array layout scheme for muon track detector structure design are presented, one is based on the staggered layout of right triangular prism μ The track detector structure of son, can reflect better position resolution performance, especially after combining μ Son energy screening, can significantly improve the position resolution performance of μ Son detector.And the position resolution performance of the μ The track detector structure based on the staggered layout of diamond column is better when the comprehensive performance of broad spectrum energy μ Son is incident, the detection area is larger, and the number of readout channels can be reduced to reduce cost.The present application is conducive to improving the comprehensive performance of μ Son track detector, increasing the detection area, reducing the position resolution error, reducing the number of channels, reducing the cost and the like.Through the present application, this scheme and performance evaluation method can be widely applied to the detector design and performance evaluation in the field of μ Son imaging, μ Son track detection.

The photovoltaic module comprises a battery piece array, a front cover plate, a rear cover plate, a sealant and a reflective film strip, the battery piece array comprises a plurality of solar battery pieces, a gap is formed between any two adjacent solar battery pieces, the battery piece array is sealed between the front cover plate and the rear cover plate through the sealant, and the reflective film strip is arranged between the front cover plate and the rear cover plate. The reflective film strip is opposite to at least part of the gap, the reflective film strip is provided with a reflective protrusion facing the front cover plate, the reflective protrusion is of a triangular prism structure, and the vertex angle alpha of the reflective protrusion and the total reflection angle beta of an interface between the front cover plate and air meet the condition that alpha is larger than or equal to 90 degrees and smaller than 180 degrees-beta. According to the photovoltaic module provided by the invention, the vertex angle of the reflective bulge is adjusted according to the total reflection angle of the interface between the front cover plate and the air, so that the light reflected to the front cover plate through the reflective bulge can be ensured to be totally reflected on the interface between the front cover plate and the air, and the refraction loss of the light at the front cover plate can be reduced; therefore, the light utilization rate of the photovoltaic module is improved.

The present application relates to sewage treatment technical field, disclose a kind of photocatalytic degradation sewage treatment device, comprising: primary treatment unit, it is regular triangular prism box structure, top is connected with water inlet end, inside is equipped with the filter layer arranged from top to bottom along the direction of water flow and can be independently disassembled;The filter layer includes: coarse filter screen, installation is in the top flow-through channel of primary treatment unit;Fine filter screen, located below the coarse filter screen;High-efficiency activated carbon layer, is equipped in the bottom of the primary treatment unit, the gradient purification structure of the device using primary, secondary, tertiary treatment unit, realizes the ordered degradation of sewage from pretreatment to advanced purification, primary treatment unit effectively removes suspended solids and macromolecular organic matter by multistage filtration, reduces subsequent processing load, secondary treatment unit carries out primary photocatalytic degradation, significantly reduces pollutant concentration, and tertiary treatment unit carries out advanced oxidation for refractory substances, to ensure that effluent quality is stable and up to standard.

The utility model discloses a laminated wood end anti-cracking structure which comprises laminated wood, a cover plate and steel nails. The end of the laminated wood is provided with an inclined first slope, the middle of the laminated wood is provided with an insertion block consistent with the slope in gradient, the bottom of the laminated wood is provided with a check block, the corresponding position of the cover plate is provided with a second slope and an insertion groove which are matched with each other, the bottom of the insertion groove is provided with an opening and a receding groove, and the insertion block and the insertion groove are matched and tightly attached and coated with polyurethane adhesive to enhance connection stability. The inserting grooves are in a dovetail groove shape and prevent the laminates from degumming and cracking in the vertical direction, the steel nails are arranged at the joints of the cover plates and the laminated wood, the cover plates are prevented from loosening and falling off, the laminates are prevented from sliding and cracking in the horizontal direction, the cover plates are in a triangular prism shape matched with the whole laminated wood, and the appearance and use are not affected. The structure effectively prevents the end of the laminated wood from cracking, prolongs the service life, and is reasonable in design, high in practicability and suitable for protecting the end of the laminated wood product.

The walking stick mainly solves the problem of how to enable the walking stick to prevent a human body from toppling backwards and laterally to a certain extent. An intelligent anti-falling walking stick is characterized in that the intelligent anti-falling walking stick comprises three stick-shaped structures, three rotating shafts, a spring, a triangular prism, a steel wire rope and a magnetic attraction structure, the three rotating shafts are connected into a triangle and installed at the upper ends of the three stick-shaped structures, each rotating shaft penetrates through one stick-shaped structure, and the magnetic attraction structure is connected with the triangular prism. The three stick-shaped structures can rotate around the rotating shaft so as to be combined and opened. The anti-falling crutch has the advantages that the anti-falling crutch can be used as a common crutch at ordinary times and can also be rapidly unfolded when the crutch is in danger of falling, the three-stick-shaped structure can stably support the ground and keep a human body stable, particularly, the human body can be prevented from falling backwards and laterally, and the anti-falling crutch has great practical value.

The design method, equipment, and storage medium of a mid-infrared scene projection system relate to the field of infrared scene projection technology and solve the lateral chromatic aberration problem caused by a mid-infrared scene projector based on a dual DMD. An RTIR prism is constructed and optimized. The first prism and the second prism form a trapezoidal prism. The first prism and the second prism are triangular prisms made of different materials. Based on the outgoing light beam entering the DMD target surface at 30°, the incident angle of the light beam entering the first prism is determined to obtain an ATIR prism. After the light beam enters the ATIR prism, it is transmitted through the first prism and the second prism before exiting the DMD target surface. The light beam vertically reflected by the DMD target surface is fully emitted at the contact surface of the first prism and the second prism, and the central ray of the light beam is emitted along the projection optical axis. Based on the ATIR prism, a mid-infrared scene projection system is designed. The present invention is used to reduce the lateral chromatic aberration caused by the mid-wave infrared illumination light beam on the DMD target surface.

The utility model discloses a combined light source detection device which comprises a cabinet, a first light source, a second light source, a spectroscope and a triangular prism, the top surface of the cabinet is provided with a first opening, the first opening is used for installing a product to be detected, the side surface of the cabinet is provided with a second opening, and the second opening is used for installing a detection camera; the first light source is arranged at the bottom end in the cabinet; the number of the second light sources is multiple, and the second light sources are arranged at the top end of the cabinet and surround the first opening. The spectroscope is obliquely arranged in the cabinet, the spectroscope is located above the first light source, and the mirror surface of the spectroscope faces the second opening; the number of the triangular prisms is multiple, the triangular prisms are arranged at the top end of the interior of the cabinet, the triangular prisms and the second light sources are arranged in a one-to-one correspondence mode, and the mirror faces of the triangular prisms face the spectroscope.

The utility model discloses a stirring and cooling device of a lithium iron phosphate kiln. The stirring and cooling device comprises an aligning and blocking component, a positioning and fixing component and a stirring component, wherein the aligning and blocking component is used for adjusting the position of a sagger filled with sintering materials in the kiln; the positioning and fixing component is used for fixing the sagger; the sagger is installed at a replacement chamber of a kiln outlet, materials in the sagger are stirred to achieve the cooling effect rapidly and evenly, and the problems that the discharging temperature of the sagger is high, and the materials are oxidized are solved. The material cooling time and the cooling water consumption are greatly reduced, and the production cost is reduced; the alignment blocking part and the positioning and fixing part ensure that the stirring assembly is positioned in the center of the sagger, the stirring and cooling effects are improved, and meanwhile equipment damage caused by shaking of the sagger along with stirring is prevented; the included angle between the S-shaped stirring teeth and the rake head is 45-60 degrees, materials in the sagger are stirred to be evenly mixed inside and outside, and the cooling effect is better; the S-shaped stirring teeth and the triangular prism type rake head prevent the stirring rod from taking out materials when the stirring rod ascends.

The present application relates to the observable projectable circular rainbow enhancement technology based on the principle of triangular prism refraction, and provides a reusable circular rainbow enhancement method and device, wherein the device for realizing circular rainbow enhancement based on the principle of triangular prism comprises a gyroid tooth-shaped prism and a projection screen, the rotation axis of the gyroid tooth-shaped prism is perpendicular to the projection screen, the cross section of the gyroid tooth-shaped prism is two strings of triangles which are symmetrically distributed along the rotation axis and connected in sequence, the gyroid tooth-shaped prism is made of transparent material, the incident light is parallel to the rotation axis of the gyroid tooth-shaped prism, enters and penetrates the gyroid tooth-shaped prism from the connected bottom side, and then is vertically projected to the projection screen. The present application is mainly applied to the design and manufacturing occasions of teaching and display devices.

The utility model provides a corrugated paper seat which comprises a first paper board and a second paper board, one side of the first paper board and one side of the second paper board are provided with paper buckling grooves, the other side of the first paper board and the other side of the second paper board are provided with paper buckling platforms, the bottom end of the first paper board is provided with two long embedding grooves, and the bottom end of the second paper board is provided with two long embedding grooves. Two auxiliary embedding long grooves are formed in the top end of the second paperboard, and an integrated rectangular paperboard is arranged at the top end of the first paperboard and the top end of the second paperboard. Compared with the prior art, the folding paper board has the advantages that the first paper board and the second paper board can be folded manually, the first paper board is folded to form a triangular prism, then the second paper board is folded to form another triangular prism, and due to the stability of a triangle, the overall shape of the triangular prism is not prone to change in the longitudinal direction and the transverse direction; in consideration of the pressure intensity borne by unit area and the overall aesthetic degree, two triangular prisms are selected to be interspersed for manufacturing, so that the stability and the strength of the seat in use are ensured.

The utility model discloses an auxiliary observation device for a theodolite, which belongs to the technical field of surveying and mapping instruments, and comprises a mounting cylinder, an auxiliary observation device and an auxiliary observation device, the connecting seat is detachably connected with the mounting cylinder, two mounting surfaces are arranged on the connecting seat, and a reflecting mirror in the shape of a straight triangular prism is jointly embedded into the two mounting surfaces; the cover plate is detachably arranged on one of the mounting surfaces, an observation opening is formed in the cover plate, and a transparent lens is arranged in the observation opening; according to the scheme, an observer only needs to bend to lower the head and overlook the observation opening for observation, so that the observer is converted from head-up eyepiece observation to overlook observation, which is different from the mode that the observer squats or half squats to make the eyes and the eyepiece translate, the observation is more convenient, the comfort of the observer is improved, and the observation efficiency is improved. In addition, the situation that the observation effect is affected due to the fact that observers shake during observation is avoided, the observation accuracy is improved, and high practicability is achieved.

The invention involves a triangular prismatic tuned mass damper suitable for large-span or cantilever structures, including a triangular prism box, particle damping units inside the triangular prism box, and a steel mass block. Below the triangular prism box are high-damping springs. The particle damping unit consists of a particle damping cavity, particles of three different sizes, and foam rubber pads. When the structural vibration amplitude is small, the particles dissipate energy by compressing the foam rubber pads and rolling. When the amplitude of structural vibration is large, the energy is dissipated by the collision of particles and the compression of the foam rubber.