215 results about "Right triangle" patented technology

The utility model discloses a prism structure, a visual angle expanding film, a backlight module and a display device, and relates to the technical field of optical films. The prism structure comprises a plurality of first prism parts and a plurality of second prism parts, the top of the second prism part is connected with the bottoms of the first prism parts; wherein the cross sections of the first prism parts are isosceles right triangles, the cross sections of the second prism parts are isosceles trapezoids, and the top width of the second prism parts is the total bottom width of the first prism parts. According to the utility model, the problems that the 1 / 2 light intensity range in the horizontal direction of a general display is within + / -50 degrees, and the 1 / 2 light intensity range in the vertical direction of the general display is within + / -35 degrees due to a single prism sheet, or a diffusion film and prism sheet bonding (DOP) / micro lens film and prism sheet bonding (MOP) and other structures with single prism layers in the current brightness enhancement film technology are solved; if a double-layer prism framework optical film scheme is used, the 1 / 2 light intensity range in the horizontal direction and the 1 / 2 light intensity range in the vertical direction are both lower than + / -35 degrees.

A multi-purpose framer's speed square in the form of a right triangle comprising a top plate with a T-shaped edge and a series of etched top plate lines including framing top plate call outs, a notched front edge having a plurality of notches spaced along the length in ¼″ increments, ruler etching callouts, and lumber width callouts denoting lumber sizes, and a hypotenuse edge having etched top plate lines, common rafter window plumb cut outs and a hip / valley section disposed above the hypotenuse edge having etched degrees and hip / valley roof rafter plumb cuts.

The application relates to the technical field of clamping devices, and discloses a double-station synchronous clamping tool, which comprises a clamping device, a workpiece placing platform and a cleaning platform. The clamping device is arranged on a track and can carry the parts on the workpiece placing platform to the cleaning platform after clamping. The clamping device is provided with a first clamping jaw and a second clamping jaw for clamping the parts. The first clamping jaw and the second clamping jaw are provided with expansion clamping jaws which can extend into the central circular holes of the parts. After the expansion clamping jaws enter the central circular holes of the parts, the expansion clamping jaws expand outward and remain in the expanded state after contacting the parts. The first clamping jaw and the second clamping jaw are connected with the clamping device through a turnover block. The turnover block is in the shape of an isosceles right triangle. The first clamping jaw and the second clamping jaw are arranged on two right-angle sides of the turnover block respectively. The oblique side of the turnover block is connected with the clamping device, and the line connecting the midpoint of the oblique side and the right angle is the rotation axis of the turnover block. After the turnover block rotates, the first clamping jaw and the second clamping jaw are exchanged in position.

This utility model discloses a photovoltaic bracket suspension support structure, mainly comprising triangular support stabilizing units. Each triangular support stabilizing unit consists of two equally sized right-angled triangular supports symmetrically arranged on the left and right sides of a column. The right-angled triangular supports are composed of a column, a crossbeam, and diagonal braces, with the column and crossbeam serving as the right-angled sides and the diagonal braces as the hypotenuses. The two right-angled triangular supports share a single column. This utility model offers advantages such as economy and safety, high construction efficiency, and rapid component installation. It effectively solves problems such as difficulty in installing photovoltaic modules in fish-solar hybrid projects, agricultural-solar hybrid projects, and projects with excessively high ground clearance, which often result in low efficiency, long construction periods, and uneconomical costs.

The application relates to a street intelligent playground device suitable for children, which comprises seven modules, the seven modules comprising five isosceles right-angled triangle modules, one rectangular module and one parallelogram module, the seven modules being spliced with each other to form a seven-piece puzzle structure, and the modules being connected through magnetic adsorption. The application has the effect of improving the applicability of the children playground device.

The invention discloses an inverted-V-shaped and linear combined stepped energy dissipater which is composed of a discharge chute, side walls and steps, the steps are formed by arranging linear steps and inverted-V-shaped steps alternately at intervals from the upstream of the discharge chute to the downstream of the discharge chute, and the alternate interval arrangement mode is that one inverted-V-shaped step and one linear step are sequentially and alternately arranged at intervals; or one inverted V-shaped step and two linear steps are alternately arranged at intervals in sequence, or one inverted V-shaped step and three linear steps are alternately arranged at intervals in sequence; the upstream first step is in an inverted V shape, and the edge of the tail end of the inverted V-shaped step in the water flow direction is in an inverted V shape. The initial edge, in the water flow direction, of the inverted-V-shaped step is connected with the linear step located on the upper step of the inverted-V-shaped step, and the top of the V shape and the initial edge of the inverted-V-shaped step are located on the same straight line. The inverted-V-shaped step is symmetrical about the central axis of the discharge chute and is composed of two right triangle steps symmetrical about the central axis of the discharge chute, and two bevel edges of a triangle are connected to form an inverted-V shape. The energy dissipater can improve the energy dissipation characteristic of the discharge chute and improve the energy dissipation effect.

The utility model relates to structural elements for use, for example, in construction to create temporary demountable structures with a load-bearing frame, such as canopies, pavilions, shelters and the like, and relates more particularly to roof structures. The technical result of the claimed utility model is that of making it possible to assemble truss structures of the desired dimensions and configuration directly at the site where a demountable truss structure is to be built. This technical result is provided by the claimed universal structural element of a frame system for building demountable structures, said element being in the form of ribs connected in the shape of a right-angled triangle, wherein the ribs have a square cross-section and four perpendicular sides in which through-holes are formed such that the holes in opposing sides are aligned with one another.

The utility model discloses a formwork wall installation perpendicularity measuring tool, relates to the technical field of building construction quality acceptance, and solves the problems that a perpendicularity measuring tool in the prior art is inconvenient to move and operate and low in use flexibility. A formwork wall installation perpendicularity measuring tool comprises a triangular support, the triangular support is of a right triangle structure, a graduated scale is arranged on one vertical edge of the triangular support, a supporting rod is arranged on the bevel edge of the triangular support, and a drop hammer is hung on the supporting rod. According to the tool, the structure of the supporting component is simplified, the triangular support which is simple and light in structure is arranged, taking and moving use are convenient, the calibrated scale is arranged and matched with the suspended drop hammer, whether the wall point position corresponding to the vertical edge where the calibrated scale is located deviates or not can be measured, and the inclination deviation degree can be determined. Moreover, the tool is light in structure, can achieve real-time measurement of the perpendicularity of the formwork wall in the installation process under various working conditions, and has the advantages of being accurate in measurement, easy and flexible to operate, rapid in paying off and the like.

The invention belongs to the technical field of erosion gully treatment, and discloses a protection device which comprises a plurality of truss units and a plurality of inclined supports, every two oppositely-arranged truss units form a group, each group of truss units abut against the side walls of farmland on the two sides of a river channel, and the multiple groups of truss units are arranged at intervals in the water flow direction of the river channel. The two truss units, located on the same side, of every two adjacent sets of truss units are connected through a plurality of inclined supports. The section of each truss unit is in a right triangle shape, and the two right-angle sides of each truss unit abut against the side wall of the farmland and the surface of the river channel respectively. According to the protection device, in-situ supporting of the eroded gully wall can be achieved through the truss units in the protection device, so that large-scale slope cutting is avoided, meanwhile, the cross section of each truss unit is arranged to be in a right triangle shape, the prefabricated truss units can be effectively used as core soil retaining components to replace traditional sloping soil bodies, and the treatment effect of no slope cutting is achieved.

The present application relates to a kind of explosion shock wave wave-absorbing structure and design method, it is related to underground mine mining technical field, wave-absorbing structure includes core wave-absorbing rock and the roadway arranged with core wave-absorbing rock as center, the core wave-absorbing rock is right triangle or obtuse triangle, the largest angle of its angle side is explosive magazine associated lane, the explosive magazine associated lane is connected with underground explosive sub-bank, the explosive magazine associated lane is as the entering end of explosive shock wave of explosive magazine, the largest angle of the angle of the core wave-absorbing rock triangle structure is connected with the two edge sides and opposite side of the largest angle of the angle, as shock wave gas buffer lane, safety lane associated lane is arranged in the opposite side midpoint of the largest angle of the angle. Through the engineering arrangement of this explosion shock wave wave-absorbing structure, the shock wave generated by underground explosive magazine accidental explosion can be absorbed, so as to play the role of protecting output end position main lane and personnel, equipment.

The invention relates to the technical field of wave simulation, and discloses a wave simulation method, device and equipment based on a triangular numerical wave flume and a medium, and the method comprises the steps: constructing a right triangle computational domain, carrying out the grid division of the right triangle computational domain, setting the top boundary of the right triangle computational domain as a pressure outlet, and carrying out the calculation of the pressure outlet; setting the horizontal right-angle side, the vertical right-angle side and the inclined side as speed inlets; loading theoretical velocity vectors of the wave water quality points to velocity inlets corresponding to the horizontal right-angle side, the vertical right-angle side and the inclined side; constructing a wave simulation model, and superposing a momentum source item in the wave simulation model; the momentum source item adjusts a difference value between a wave theoretical velocity solution and a current flow field numerical solution through a weighting function; and carrying out iterative solution on the wave simulation model, and outputting and updating the wave surface elevation and flow field velocity distribution in the right triangle calculation domain. According to the invention, the problem of serious reflection interference at the lateral boundary can be reduced, and the calculation efficiency is improved.

The embodiment of the application provides an airborne laser point cloud ground target device and a pose solving method, and belongs to the technical field of measurement, and specifically comprises: a point cloud data target component, a target space pose determination component and a digital marker component; the point cloud data target component is composed of two square plane target plates, the two plane target plates are fixed through rigid support rods, and form an inverted V-shaped structure in a relatively inclined manner, and the upper edges of the two plane target plates are parallel to each other and have a spacing; the target space pose determination component is composed of two coplanar and symmetric isosceles right triangles whose symmetry axes are perpendicular to each other, and the two triangles are arranged at a common reference vertex; the digital marker component is four circular markers with numbers, the four circular markers are coplanar with the two triangles, and are symmetrically arranged in four quadrants divided by the symmetry axes of the triangles with the common reference vertex as the center. Through the scheme of the application, the monitoring accuracy and adaptability are improved.

This invention relates to the field of wave simulation technology, and discloses a wave simulation method, apparatus, equipment, and medium based on a triangular numerical wave flume. The method includes constructing a right-angled triangular computational domain, meshing the right-angled triangular computational domain, setting the top boundary of the right-angled triangular computational domain as a pressure outlet, and setting the horizontal right-angled side, vertical right-angled side, and inclined side as velocity inlets; loading the theoretical velocity vector of wave water particles onto the velocity inlets corresponding to the horizontal right-angled side, vertical right-angled side, and inclined side; constructing a wave simulation model and superimposing a momentum source term within the wave simulation model; adjusting the difference between the theoretical velocity solution of the wave and the current numerical solution of the flow field through a weighting function of the momentum source term; iteratively solving the wave simulation model, and outputting and updating the wave surface elevation and flow field velocity distribution within the right-angled triangular computational domain. This invention can reduce the problem of severe reflection interference at the lateral boundary and improve computational efficiency.

The present application relates to the technical field of marine engineering digital twin and three-dimensional visualization technology field, provide a kind of based on right triangle grid's dredging topography twin's generation method and system, comprising: obtaining regular grid elevation or sampling height data after pre-processing that have been unified to engineering plane coordinate system, determine the space range covered read space range and density parameter, based on space range and total row number and total column number of calculated grid;In the space covered, generate regularly arranged vertex, construct the topological structure of isosceles right triangle grid;With vertex as unit, several Chunk blocks are divided into global grid with fixed size, establish the triangular index mapping relationship of global row and Chunk block, the three vertices of isosceles right triangle and elevation or height data are filled in each Chunk block in parallel, generate local VBO, IBO and AABB;Batch rendering and coloring according to height color table are executed to all Chunk blocks, and the visualization of topography is realized.

The utility model discloses a PCB (printed circuit board) warpage measuring tool, which relates to the technical field of PCB detection, and comprises a measuring tool, the measuring tool is a right triangle plate, the included angle between the long straight edge and the bevel edge of the measuring tool is 10 degrees, the long straight edge of the measuring tool is provided with scale marks, and the bevel edge of the measuring tool is detachably provided with a support assembly. According to the utility model, the measuring tool is a right triangle with the angle of 10 degrees, the long straight edge of the measuring tool is provided with the scale marks, during measurement, the hypotenuse of the triangle is taken as the bottom, the measuring tool is inserted into the warping area, the scale of the long straight edge is read and recorded after insertion, and the warping value is obtained by multiplying the scale by sin 10 degrees, so that the measuring tool is simple and convenient to operate and does not need to be like a feeler gauge and a needle gauge; and different specifications need to be used for comparison one by one, so that the data measurement efficiency can be effectively improved.

This invention relates to the field of electromagnetic properties technology, and particularly to an electrically controlled foldable corner reflector. An electrically controlled foldable corner reflector includes a first reflector, a second reflector, and a third reflector, all in the shape of a right-angled triangle. Each of the first, second, and third reflectors includes a first right-angled side and a second right-angled side. The first right-angled side of the first reflector is hinged to the first right-angled side of the second reflector, and the second right-angled side of the second reflector is hinged to the first right-angled side of the third reflector. The second right-angled side of the third reflector is detachably connected to the second right-angled side of the first reflector. This invention provides an electrically controlled foldable corner reflector that is convenient for storage and transportation.

The utility model discloses a combined type gap measuring scale which comprises a first plate body and a second plate body which are respectively formed by three edges connected end to end, any acute angle edge of the first plate body is provided with scale marks, the scale marks are composed of a plurality of length scale lines, and the length scale lines are arranged on the first plate body. The numerical value represented by each length scale line is the distance from the point of the length scale line on the acute angle side to the other acute angle side, the second plate body is a right triangle, and at least one edge of the second plate body is provided with an indexing mark. According to the utility model, the first plate body and the second plate body are matched for use, so that other obstacles around cannot interfere with the caliper during measurement; the right angle can be used to determine whether to be perpendicular to the measured object. According to the utility model, the integrated characteristic of a vernier caliper is abandoned, mechanical structures such as a combined bayonet are not provided, the overall structure is simple, the manufacturing cost is low, and the measurement precision is improved.

The invention discloses a circuit diagram rasterization processing method and device, equipment and a storage medium, and relates to the technical field of circuit image processing. The method comprises the following steps: determining at least one graph segmentation line according to a target vertex coordinate set of a line contour diagram in a target circuit diagram, and dividing the line contour diagram to obtain at least two trapezoidal contour diagrams; according to the vertex coordinate set of the trapezoidal contour map, judging the map type of the trapezoidal contour map to obtain a target contour map type including a right-angled trapezoidal contour map and a non-right-angled trapezoidal contour map; and according to the target contour diagram type, segmenting the trapezoidal contour diagram to obtain at least one rectangular contour diagram and at least one right triangle contour diagram, and performing rasterization processing to obtain a rasterized circuit diagram. According to the scheme, the trapezoidal profile diagram is divided into the rectangular profile diagram and the right triangle profile diagram according to the type of the target profile diagram, and rasterization is carried out, so that the rasterization efficiency of the trapezoidal profile diagram is improved.

The utility model discloses a sliding type rain-proof shed for hanging basket construction. The sliding type rain-proof shed comprises a supporting system, a shielding ceiling and an automatic control sliding system. The supporting system is composed of two sets of supporting frameworks arranged in parallel, and each set of supporting frameworks is composed of a structural frame composed of two right triangles. The two right triangles have a common right-angle side which is vertically arranged; a right triangle structure frame is arranged on a hanging basket construction poured beam section, the right-angle side is transversely arranged on the poured beam section, and an automatic control sliding system is arranged at the bottom of the right triangle structure frame. The other right triangle structure frame is arranged above the outer hanging basket of the poured beam section in a suspended mode, and the right-angle side is transversely arranged above the hanging basket and covers and shields the ceiling. And the self-control sliding system is composed of at least two groups of driving rollers at the bottom of each group of supporting frameworks. The rain-proof shed adopts a combined triangular structure frame, is stable and reliable in structure, is arranged on a poured beam section in hanging basket construction, and can automatically move integrally along with a hanging basket through a self-control pulley system, so that the construction is more convenient and safer.

The utility model belongs to the technical field of retaining walls, and particularly relates to a gabion net retaining wall device which comprises four supporting columns, the upper faces and the lower faces of the four supporting columns are right-angled triangles, the two side faces of the four supporting columns are rectangular, two strip-shaped plates are connected between every two adjacent supporting columns, and the two strip-shaped plates are the first strip-shaped plate and the second strip-shaped plate respectively. The first strip-shaped plates are connected to the upper portions of the supporting columns, the second strip-shaped plates are connected to the lower portions of the supporting columns, in this way, the four supporting columns, the four first strip-shaped plates and the four second strip-shaped plates are matched to form a frame, gabion nets are connected to six faces of the outer side of the frame, first positioning connecting plates are arranged on one outer side faces of the supporting columns, and second positioning connecting plates are arranged on the other outer side faces of the supporting columns. According to the retaining wall body, the gabion net body can be fixed on the outer surface of the frame body more firmly, the gabion net body is not prone to deformation and disintegration, a plurality of adjacent gabion net cages can be tightly connected, and the stability of the whole retaining wall body is improved.

The utility model discloses a mounting bracket for a flap door. The mounting bracket comprises a first base, a second base and a connecting piece, the connecting piece is in the shape of a right triangle under the view angle of a front view, and first threaded holes are formed in the two right-angle sides of the connecting piece. A plurality of mounting holes are formed in the first base and the second base; and the first base and the second base are mounted on the two right-angle sides of the connecting piece by bolts through the mounting holes and the threaded holes. According to the flap door installation support, the first base, the second base and the connecting piece are connected through the bolts, when the bases are bent or broken, the damaged bases can be accurately positioned and independently detached and replaced by means of the characteristic that bolt connection is easy to detach, the whole installation support does not need to be replaced, the maintenance cost is effectively reduced, and the maintenance efficiency is improved. The maintenance time and manpower consumption are reduced, the stability and reliability of the flap door system are improved, and the economic and use burden of a user caused by the damage of the base is relieved.

The utility model discloses a sojourn house which comprises a main body frame and a roof frame, a longitudinal beam is arranged on the top of the main body frame, and the two ends of the longitudinal beam are connected with supporting stand columns. The roof frame comprises a first stand column and second stand columns which are vertically arranged on the longitudinal beams, and the second stand columns are located on the two sides of the first stand column; the second stand column is higher than the first stand column; one end of the roof cant beam is connected with the top of the second upright, and the other end is connected with the longitudinal beam and the supporting upright; the roof cross beam is arranged at the top of the first stand column, and two sides of the roof cross beam cling to the second stand columns on two sides respectively. The second stand columns, the roof cant beams and the longitudinal beams define the right triangles, the right triangles on the two sides of the first stand columns are symmetrically arranged, and the roof structure is high in overall stability and strength. By means of the specially-designed connecting pieces, deep connection and fixation and stress dispersion of the roof oblique beams, the longitudinal beams of the main body frame and the supporting stand columns are achieved, the assembling strength of the sojourn house is improved, and the roof solar panel mounting structure is particularly suitable for mounting of roof solar panels.

The utility model discloses a force decomposition feeling experiment teaching aid, and belongs to the technical field of teaching aids. The teaching aid comprises a base, a vertical plate, a first plumb bob, a second plumb bob, a long support rod and a short support rod. The long supporting rod and the short supporting rod are installed on the right side face of the vertical plate respectively, and the right side end of the long supporting rod and the right side end of the short supporting rod are provided with guide grooves or holes. The left side section of the long supporting rod is provided with an external thread, the external thread is matched with the through hole of the vertical plate and fastened through a nut, the supporting length can be adjusted, and a handle is arranged at the upper end of the vertical plate. According to the teaching aid, students can intuitively understand a force decomposition principle by observing a right triangle formed by the vertical plate, the long support rod, the first suspension wire and the first plumb bob; and the direction and the size of the force can be sensed by holding the short supporting rod and the second suspension wire, and the device is simple in structure, easy to manufacture and low in manufacturing cost.

The utility model discloses a three-body 220kV phase-shifting transformer. The three-body 220kV phase-shifting transformer comprises a phase-shifting transformer body and a diversion assembly, the diversion assembly is arranged on the phase-shifting transformer body; the flow guide assembly comprises a fixed plate, a flow guide block and a lug plate; the two fixing plates are symmetrically and fixedly arranged on the phase-shifting transformer body; the two diversion blocks are arranged on the two sides of the phase-shifting transformer body in a central symmetry manner; the two lug plates are fixedly arranged on the sides, away from each other, of the two flow guide blocks, and the lug plates are connected with the fixing plate through three bolts. The three-body 220kV phase-shifting transformer has the advantages that the three-body 220kV phase-shifting transformer is simple and reasonable in structure and ingenious in design, natural wind is guided, the flowing path of the natural wind is prolonged, the heat dissipation effect of the phase-shifting transformer body can be improved, the heat dissipation efficiency of the phase-shifting transformer body is improved, and the service life of the three-body 220kV phase-shifting transformer is prolonged. And the utilization rate of natural wind can be increased.

The invention discloses a parallelogram supporting structure for a large-size cantilever floor slab of a frame structure, and belongs to the technical field of building structure engineering. The frame structure comprises three stand columns distributed in a right triangle mode, a connecting beam is connected between the two stand columns located on the right-angle sides, and the stand columns located on the two acute-angle points are each provided with a cantilever beam. The parallelogram supporting structure comprises a main transverse rib, a secondary transverse rib and two longitudinal ribs. The two ends of the main transverse rib are connected with the midpoint areas of the two cantilever beams correspondingly. The secondary transverse rib is parallel to the main transverse rib, and two ends of the secondary transverse rib are respectively connected with midpoint areas of the two connecting beams; the two ends of each longitudinal rib are connected to the middle area between the corresponding cantilever beam on the side where the longitudinal rib is located and the connecting beam. According to the invention, the natural vibration frequency of the floor slab can be obviously improved, the vibration acceleration of the floor slab under dynamic loads such as walking can be reduced, and the use comfort of a frame structure building can be improved.

The utility model discloses a motor box for a drainage component of a washing machine, and relates to the field of washing machines, the motor box comprises a stator assembly and a cavity which are respectively arranged on two sides of a rotor assembly, and the stator assembly comprises a shell sleeved on the surface of a coil framework. A fixing assembly is arranged in the first cavity and comprises a friction block which is located in the first cavity and can slide transversely, the side, close to the surface of the coil framework, of the friction block abuts against the surface of the coil framework, and a right triangle groove is formed in the top of the friction block. According to the device, the friction block is arranged, and the side, attached to the surface of the coil framework, of the friction block abuts against the surface of the coil framework to generate friction force, so that the shell is prevented from sliding or shaking relative to the coil framework, the stator assembly is fixed in the shell, and the stability of the device is improved; fastening pieces such as bolts which are difficult to grasp tightness are avoided, and the operation is simple and quick.

The utility model provides a decoration frame used for a wall switch and a socket, comprising a decoration frame body, each inner corner of the decoration frame body is provided with a connecting plate, each connecting plate is connected with two adjacent inner side edges of the decoration frame body into a whole, each connecting plate is provided with an assembling hole, and the assembling hole is connected with the decoration frame body. Each connecting plate is of a right triangle-shaped structure; a plurality of fracture holes distributed at intervals in the extending direction of the corresponding right-angle side of the connecting plate are formed in the connecting position of each right-angle side of the connecting plate and the inner side edge of the decoration frame body. According to the utility model, the excessive connecting plates can be conveniently broken relative to the decorative frame body.

The side punching die comprises an upper die, a lower die and a side punching device, the bottom face of the upper die is provided with a pressing groove with the cross section being a 45-degree right triangle, the lower die is provided with a boss with the cross section being a rectangle, the included angle between the boss and the top face of the lower die is 45 degrees, and the side punching device is arranged in the pressing groove. The top of the boss is matched with the pressing groove, a 45-degree side punching device is arranged on the side face of the combination face of the upper die and the lower die, the side punching device comprises a punch pushing block movably arranged on the upper die and a guide block fixed to the lower die, a sliding punch is arranged on the side face of the pushing block, and when the upper die and the lower die are closed, the punch penetrates through the combination face. The side punching die has the advantages that side punching of the groove-shaped component in the 45-degree inclined state is achieved, on one hand, the groove-shaped component can be conveniently placed in and taken out of the punching die, on the other hand, the stress condition of the lower die during punching is improved, it can be guaranteed that the lower die is not prone to deformation in the punching process, the service life of the die is longer, and the production efficiency is improved. And the processing cost of punching is indirectly reduced.

A dustproof head for venting a storage tank includes a concave shell with a convex plate. A top cover is mounted on the convex plate. The concave shell has multiple baffles with multiple windows. A concave cover is welded to the back of each baffle. The two sides of the concave cover are right-angled triangular structures. The projection of the windows along the horizontal direction is located on the vertical wall of the concave cover. A notch is provided on the vertical wall of the concave cover. An outer clamping plate and an inner clamping plate are welded to the inner wall of the concave cover. The outer and inner clamping plates are vertically arranged with a gap between them. An insert frame is inserted into the gap between the outer and inner clamping plates, and a dustproof bag is attached to the insert frame. This invention uses the inclined baffles to block the movement of dust, thereby intercepting it at the front of the baffles. The partitions, rectangular openings, and vertical baffles further enhance the dust blocking effect, reducing the amount of dust trapped in the dustproof bag and extending the filtration time.