204 results about "Circular arch" patented technology

The invention relates to a cast-in-site watery concrete stand template and its constructing method, where the seat platform and seat-back stile are encircled with seat platform bed template panel, seat back stile's up-front vertical surface hanger template, seat back stile's down-front vertical template panel, rear vertical template panel and seat back stile's bed template panel, and the position of the ventilating hole is pre-buried with PVC pipe; the external angle position is equipped with an circular-arch chamfered external angle die strip plate; a triangular strip is cut off outside the bottom end of the seat back stile's up-front vertical surface hanger template in the internal angle position; horizontal secondary keel and vertical primary keel are used to support the back of each template panel; the primary keel is supported on support beam, the support beam is arranged on the support beam body; the primary keel of the hanger template hangs and is supported by temporary vertical support, and wall-passing bolt runs in order through the primary keel of the hanger template, seat back stile's up-front vertical surface hanger template, ventilating hole, rear vertical template panel and the primary keel of the rear vertical template panel and is fastened. And the invention advances constructing schedule, assures construction quality and besides, reduces engineering cost.

The invention belongs to the technical field of a water discharging strobe in an underground laneway of a mine and in particular relates to a circular arched dividable upper-turning waterproof strobe in the underground of the mine, which solves the problems that the prior waterproof strobe can not meet the need of the mine. The circular arched dividable upper-turning waterproof strobe comprises door frames and door leaves; each of the door frames comprises an upper door frame, a lower door frame, a left door frame and a right door frame; the upper door frame and the lower door frame have the same circular arched shape; each of the door leaves comprise an upper door leaf and a lower door leaf which are connected by a connecting bolt I; the cross sections of the upper door leaf and the lower door leaf have the circular arched shape; the radians of the upper door leaf and the lower door leaf are consistent with the radians of the upper door frame and the lower door frame; the top of the upper door leaf is hinged with the upper door frame; the upper door leaf is connected with the front end of a hydraulic jack for opening and closing the door; and the rear end of the hydraulic jack for opening and closing the door is fixed relative to the upper door frame. The circular arched dividable upper-turning waterproof strobe has the following advantages of wide application range, large bearing capacity and large door area which can meet the use requirements of the large section of the laneway, simple machining and manufacturing process and low machining expense.

A protective enclosure for protecting garden plants against frost and other environmental hazards. The enclosure consists of semi-circular arches over which a protective cover is deployed. The cover is held in place by elastic hold-downs strung across the outside of the cover at each arch. Each arch presents to the hold-down a concave shape that receives and stabilizes the hold-down element. The cover is translucent to sunlight and may include two types of material, one impervious to wind and rain, the other a mesh transparent to wind and rain. The wind-impervious material may be bunched up under the hold-downs, leaving plants protected only by the mesh. Access to plants is gained by lifting and bunching up the mesh, which is re-deployed when access is no longer necessary.

The invention discloses a large-scale underground cavern group layout method applied to water conservancy and hydropower engineering and underground storage cavern engineering. The underground cavern group layout method can give overall consideration to major factors having influences on underground cavern adjoining rock stability, particularly gives overall consideration to the crucial factor of the rock strength-stress ratio, enables a large-scale underground cavern group layout designing scheme to be scientific, and is overall in considered factors. The method includes the following steps: firstly, determining the positions of main caverns, then determining the axis directions of the main caverns, determining the thickness of a rock pillar between the main caverns, and finally determining cavern shapes of the main caverns. When the cavern shapes of the main caverns are determined, each main cavern is divided into an underground main power house, a main transformer chamber and a tail water surge chamber according to functions, the hole shape of each underground main power house and the hole shape of each main transformer chamber are in circular arch straight wall shapes or egg shapes, and each tail water surge chamber is in a cylinder shape or a gallery shape.

A novel linear guide plain bearing has a guide rail with rail-grooves formed respectively in opposite side surfaces thereof, and a slider with slider-ridges formed respectively on opposed inner side surfaces thereof. The slider is mounted in a straddling manner on the guide rail for sliding movement therealong. Each of the guide-grooves has a Gothic arch cross-sectional shape while each of the slider-ridges has a circular arch cross-sectional shape. The slider slides relative to the guide rail in an axial line contact condition. A solid lubricant-containing resin coating is formed on each of the slider-ridges, whereby the sliding resistance and sliding noise can be reduced more efficiently.

A device for supporting a cable installed between a vehicle body and a movable member movably connected to the vehicle body. The device has a guide member and support members. The guide member has a first opening for cable insertion, communicating with a hollow section of a frame body, and a second opening for cable insertion, communicating with the hollow section with a predetermined angle less than 180 degrees relative to the first opening. On the outer surface of the frame body is provided a three-dimensional circular arch surface. The support members rotatably hold the three-dimensional circular arch surface of the guide member and are fixed to the vehicle body and / or movable member. The cable is made to penetrate from the first opening of the guide member through the hollow section to the second opening, and the guide member can follow a change in the angle of the cable in top-bottom, left-right, and oblique directions.

This invention is a trough solar collector that uses the principles of high leverage in order to produce a lightweight, inexpensive thermal solar collector. The parabolic reflectors are held in proper shape by rigid ribs that are spaced apart along the length of the collector. The structure of the trough is held rigid by a unique sun-tracking system that not only guides a long trough row to point it toward the sun, but also maintains the whole length of the row in rigid configuration. Small-diameter cables are wrapped around a rotatable pipe that extends along the row. The cables extend around circular arches attached to the parabolic ribs that provide high leverage for rotating the troughs. Since the arches rotate in unison, the long trough row is maintained in rotational rigidity. Rather than having heavy concrete foundations and heavy structures to support the troughs, lightweight support posts are placed into the ground, and guy wires maintain the position of the posts.

The invention provides a damping and heat-dissipating device for a rolling bearing. The damping and heat-dissipating device comprises a bearing base, a bearing gland, a revolving shaft, a damping rubber ring, a wave spring and the rolling bearing, wherein the wave spring is arranged in a gap between the side face of the rolling bearing and the bearing base. The wave spring is made of beryllium bronze, so that the wave spring has higher heat conductivity and can be used for effectively transferring heat generated by high-speed rotation of the rolling bearing. According to the damping and heat-dissipating device, the wave spring has a semi-circular arch-shaped structure, so that the elasticity is improved, the radial contact rigidity of the rolling bearing is reduced, and the vibration impact of the rolling bearing is reduced. The service life of the rolling bearing is prolonged, so that the service life of a turbo molecular pump is prolonged.

The invention discloses a construction method of a bricked large-span multiple-arc-arch. The large-span multiple-arc-arch consists of a large arc arch with span being 3100mm arranged at the outer edge of a common facade wall body as well as a double-small-arc-arch, wherein the double-small-arc-arch is formed by two small arc arches whose spans are both 1500mm at the inner edge the common facade wall body. The construction method for constructing the large-span multiple-arc-arch comprises nine processes: 1) firing common shale perforated bricks and wedge-shaped and polygonal abnormal-shape perforated bricks; 2) erecting small circular arch moulding beds; 3) measuring the number of brick moulds; 4) constructing the second small arc arch; 5) cutting and machining the abnormal-shape bricks; 6) constructing the wall body; 7) constructing an arc concrete beam; 8) constructing a sand aerated inner haunch wall and filling expanded and vitrified small balls while constructing; and 9) pouring structural columns of the inner haunch wall. By the construction method, the difficulty that the bricked large-span multiple-arc-arch cannot be constructed by the traditional construction method is overcome; the bricked large-span multiple-arc-arch can bear axial pressure and has structural safety; and the service life of the bricked large-span multiple-arc-arch is guaranteed.

The invention discloses a corrugated steel-concrete combined support structure and a method for constructing the same. The corrugated steel-concrete combined support structure comprises circular archcorrugated steel plates, straight wall corrugated steel plates, a reinforcing steel bar mesh and bases. The method includes sequentially connecting circular arch corrugated steel with straight wall corrugated steel by bolts, and pouring concrete bases at the ends of straight walls; forming grouting holes in the middles of various pieces of corrugated steel and pouring superfluid concrete between the grouting holes and surrounding rock. The corrugated steel-concrete combined support structure and the method have the advantages that the corrugated steel-concrete combined support structure is made of corrugated steel-concrete combined structures, and accordingly new tunnel support and damaged tunnel maintenance requirements can be met; diversified parameters such as the thicknesses of different types of corrugated steel plates and the sizes and the radian of unit sheets in the corrugated steel-concrete combined support structure can be adjusted according to particular engineering conditions, and accordingly the corrugated steel-concrete combined support structure and the method are high in applicability; the corrugated steel-concrete combined support structure can be constructed by means of prefabrication on external fields, reinforcing steel bar binding on sites can be omitted, accordingly, the labor intensity of workers can be relieved, the construction speeds can be increased,and the construction quality can be improved; tunnels can be quickly strengthened and maintained by the aid of the corrugated steel-concrete combined support structure, and the tunnel operation and maintenance costs can be reduced.

The invention relates to a circular-arched steel-corrugated-plate bridge and culvert structure. A circular-arched bridge and culvert with a reinforced concrete structure is not adaptable to foundation deformation and uneven settlement well, damages caused by earthquakes cannot be buffered effectively, construction cost is high and construction period is long. Bases are arranged at the lower portion of the bridge and culvert structure. Single-span or multi-span bridge arches are arranged on the upper portions of the bases, are steel-corrugated-plate circular arches and are formed by assembly and fixation of steel corrugated plates through bolts. The radius of each steel-corrugated-plate circular arch is 2.1648m, central angle is 135 degrees, arc curvature radius is 4.33m, single span is 4m, and rise height is 1.3365m. A circular-arched bridge and culvert with the structure has axial corrugations and excellent mechanics characteristics, stress strain caused by load is simultaneously distributed axially and radially, stress concentration of the load is effectively dispersed, advantages of a steel structure are exploited better, and wide application prospect is provided.

The invention relates to heat supply equipment, in particular to a biomass ash-free combustion furnace. The biomass ash-free combustion furnace is characterized in that the inner wall, faced by an end port of an air feeding pipe (7), of a hearth (2) and the inner wall, above the air feeding pipe (7), of the hearth (2) are a circular arch-shaped curved surface formed by circular arch-shaped surfaces in a smooth connection mode, a negative-pressure port (8) is formed at the upper side of the air feeding pipe (7) entering the hearth (2), combustion air at the negative-pressure port (8) firstly passes through a wind pressing piece (9), the edge of one side of the wind pressing piece (9) is bent obliquely towards the rear lower direction, and the air feeding pipe (7) outside a furnace body (1) is communicated with a fuel conveying pipe (5). The biomass ash-free combustion furnace has the advantages that fuel enters the hearth along with the wind, rotates and flies up and down, is combusted and is not accumulated easily, the unburnt fuel is sucked to the air feeding pipe and is sprayed out again for combustion, so that the combustion is more sufficient, and almost no ash is reserved. In addition, a heat storage chamber stores a large amount of heat to improve the temperature of the hearth. The air feeding pipe passes through the heat storage chamber, so that the fuel and the combustion air can be preheated, a large amount of combustion air is from the hearth, and the heat of the furnace is accumulated continuously and reaches or approaches the heat of compressed straws and coal. The biomass ash-free combustion furnace can serve as various heat exchanging equipment such as a hot blast heater, a water heater and an oil furnace, substitutes coal-fired furnaces to carry out a heat-supply operation, and has great significance of saving coal, protecting the environment, fully utilizing crop straws, improving the value of the crop straw and increasing the income for farmers.

The invention discloses a method for performing anchoring and grouting reinforcement inside a deep well soft rock gob-side entry retaining, and the method comprises the steps of performing deep-hole high-strength anchoring and grouting reinforcement inside a gob-side entry retaining on the basis of a lane-side filling body support at the gob-side entry retaining original support and the back production side after back production outside the front of the back production surface influenced by the back production. The method comprises the steps of 1. using a hollow anchor cable for support, namely A. arranging a rectangular or a trapezoid tunnel: a. a hollow anchor cable close to a reinforcing top board at the coal side inclines toward the coal side for 10-20 DEG; b. a hollow anchor cable for a lane at the coal side or a hollow slip-casting anchor pole is reinforced; B. arranging a semi-circular arch or other arched tunnels: arranging a vault hollow anchor cable along the direction perpendicular to the arched tangent of a tunnel; 2. Increasing a reinforcement scope: the length of the hollow slip-casting anchor cable is 4m-10m; 3. Employing a high-strength slip-casting material; and 4. slip-casting in high pressure. The method is used to bury large Three Soft coal gob-side entry retaining; the deformation of surrounding rocks can be effectively controlled; the gob-side entry retaining top board can be maintained; the tunnel section shrinkage can be reduced; and the gob-side entry retaining can be reused successfully.

The invention discloses a semi-automatic arch culvert construction template. The semi-automatic arch culvert construction template is characterized in that a door-shaped support is arranged along the longitudinal direction, two columns of support rollers are arranged in parallel along the longitudinal direction on the top frame of the door-shaped support; two backform trusses which are bilaterally symmetrically arranged are respectively triangle structures composed of chord members and bracing pieces, wherein the chord member is supported by a jacking cylinder and a roller which are fixedly arranged on the top frame of the door-shaped support; the two bilaterally symmetrical backform trusses are connected between the bracing pieces by virtue of a lead screw with an adjustable length; a backform is hinged by a left circular arch section and a right circular arch section by virtue of a steel pin at the middle part; the left circular arch section and the right circular arch section of the backform are respectively fixed and welded on a backform truss at a corresponding side; a pair of side forms are respectively hung at the two ends of the backform; and an arch external mould is positioned and supported at the periphery of an arch internal mould composed of the backform and the side forms by virtue of a pull rod. The semi-automatic arch culvert construction template disclosed by the invention can greatly improve efficiency of arch culvert construction.

The invention provides a totally-enclosed flow guide device for the pantograph area of a high-speed train. The device comprises a flow guide cover, two side wings are symmetrically arranged on the flow guide cover, the flow guide cover is arranged in a streamlined circular arch shape or a water drop shape, a lower arm frame hole and a pull rod hole are formed in the middle of the flow guide cover, a pantograph is arranged in the flow guide cover, the lower arm frame hole and the pull rod hole are respectively used for a lower arm frame and a pull rod of the pantograph to pass through; and the device also comprises two sets of driving devices, which are symmetrically arranged, the two sets of driving devices are connected with the two side wings correspondingly, and the driving devices are used for driving the side wings to open, close and rotate. The functions of the pantograph are not affected, the pantograph is completely closed during pantograph descending, impact of airflow with a base and a rod piece at the bottom of the pantograph and a pantograph area cavity is reduced during pantograph ascending, and therefore the purposes of reducing resistance and noise are achieved.

The invention discloses a large-span bidirectional arch truss cable membrane material field closed structure system, belongs to the field of large-span space structures, and is particularly suitable for material field closed buildings and the like. The novel bidirectional arch truss cable membrane material field closed structure is mainly composed of an arch gable wall, a middle three-core circular arch truss and an outer cable membrane enclosing structure which are connected with concave secondary trusses. According to the structure, the use characteristics of a material field closed buildingare combined, and a tensioned membrane structure is utilized to act as a building enclosure, so that the consumption of steel is greatly reduced, the engineering cost is effectively reduced, the economical efficiency of the structure is improved, the construction cost pressure faced by large-span material field closed building construction is relieved, and the application prospect is wide. The large-span bidirectional arch truss cable membrane structure system has the advantages of being novel in structural form, reasonable in structure stress, strong in collapse resistance, attractive in architectural image and the like, is convenient to manufacture and install, and has strong practical significance.

The invention discloses an operation platform and a continuous operation system and operation method for tunnel construction thereof. The operation platform comprises an arch support similar to the transverse shape of the arched inner wall of a tunnel and a traveling system for enabling the arch support to move in the longitudinal direction of the tunnel. The traveling system includes a main traveling mechanism and auxiliary traveling mechanisms. The arch support is connected to a suspended rail in a suspended mode by the main traveling mechanism, and the arch support is connected to supporting rails in a supporting mode by the auxiliary traveling mechanisms. A circumferential traveling mechanism for carrying a machine head of construction equipment is arranged on the arch support in the circular arch direction of the arch support. By using the continuous operation system for the tunnel construction of the operation platform, a brand new tunnel drilling and blasting construction methodis provided, the technical problems of irregularity of a construction site, various excavation methods and low equipment universality in the construction process of the drilling and blasting method are effectively solved, and foundation and condition are laid for the full mechanization and unmanned construction of the tunnel of the drilling and blasting method.

The invention provides a tunnel arch crown settlement and peripheral convergence monitoring method. The tunnel arch crown settlement and peripheral convergence monitoring method comprises installing a rope free of elastic deformation, wherein one end of the rope is fixed on an arch foot arranged at one end of every tunnel section, the other end of the rope is tied on an electric spring scale after calibration, the spring scale is located on an arch foot arranged at the other end of every tunnel section, and the middle portion of rope penetrates a tunnel circular arch; pre-applying the initial force when the monitoring is started to enable an initial reading to be displayed on the electric spring scale, pulling the rope to enable the initial reading on the spring scale to tend to be stable and recording; repeating the above steps and deploying the same way of monitoring on the plurality of sections; performing continuous observation on readings of the electric spring scale during tunnel construction, suspending the construction if the readings are changed, performing repeated observation on the tunnel sections through a full-drilling machine or a three-dimensional laser scanner and performing real-time treatment when problems are found. A tunnel arch crown settlement and peripheral convergence monitoring device is simple, free of model prediction, small in calculation amount and free of technical difficulties and workers can timely find dangerous situations conveniently.

The invention belongs to the technical field of a water discharging strobe in an underground laneway of a mine and in particular relates to a circular arched split type waterproof strobe in the underground of the mine, which solves the problems that the prior waterproof strobe can not meet the need of the mine. The circular arched split type waterproof strobe comprises door frames and door leaves; each of the door frames comprises an upper door frame, a lower door frame, a left door frame and a right door frame; and the door leaves are arranged on the door frame by a door pivot. The circular arched split type waterproof strobe is characterized in that the upper door frame and the lower door frame have the circular arched shape; the cross section of the door leaves has the circular arched shape; the radians of the door leaves are consistent with the radians of the upper door frame and the lower door frame; and each of the door leaves consists of a left door leaf and a right door leaf which are symmetrical. The circular arched split type waterproof strobe has the following advantages of wide application range, large bearing capacity and large door area which can meet the use requirement of large section of the laneway, simple machining and manufacturing process and low machining expense.

The invention discloses a dining chair which is characterized in that: a chair back and a seat surface have an integrated structure, a circular arch transitional surface is arranged between the chair back and the seat surface, and chair legs are installed at four corners below the seat surface respectively. Through the arrangement, the greatest characteristic of the invention is that: the dining chair is provided with the circular arch transitional surface, and the curve fluctuation of a human body is sufficiently considered in the manufacturing process, so that the feeling of fatigue of a user caused by long-time sitting is alleviated; and the dining chair reflects the aesthetic appreciation of modern people, and is practical and economical.

The invention relates to a lower extremity exoskeleton heterogeneous knee joint based on parallel elastomer, and relates to a heterogeneous knee joint. The invention solves the problems that a dead point is possible to easily cause injury to a human body and the comfort of human movement is poor when a conventional lower extremity exoskeleton knee joint makes a leg lift. An end cover is fixed on the outer annulus surface of a knee joint body through a flange, and the parallel elastomer is fixed in the end cover; the parallel elastomer is coaxially fixedly connected with an output shaft of a speed reducer through a shaft frame. A magnetic encoder magnetic ring is arranged on the knee joint body, a magnetic encoder magnetic head is arranged on the parallel elastomer, and the magnetic encodermagnetic ring is arranged relative to the magnetic encoder magnetic head; the knee joint body is processed with a circular arch groove along an outer edge, two adjustable limit blocks are arranged inthe circular arc groove, and the circular arc groove and a connecting plate are arranged in a directly facing manner; a plurality of limit holes are processed in the connecting plate in a circumferential direction. Limit pins are inserted on the connecting plate, and elastic rubber blocks are arranged between the adjustable limit blocks and the limit pins. The lower extremity exoskeleton heterogeneous knee joint is applied to a lower extremity exoskeleton robot.

The invention discloses a circular-arch-shaped polycrystalline diamond composite sheet preparing method. The circular-arch-shaped polycrystalline diamond composite sheet preparing method comprises thesteps that firstly, hard alloy base body purification treatment is conducted; secondly, a transition layer is deposited on the surface of a hard alloy base body; thirdly, ion implantation of diamondis conducted; fourthly, material mixing is conducted; fifthly, composite body assembling is conducted; sixthly, composite body purification is conducted; and seventhly, high-temperature high-pressuresintering is conducted. N<+> and B<+> are injected into the surface of the diamond through the ion beam injection technology, structure defects existing in the ordinary diamond particle surface are overcome, performance compatibility is improved, and heat stability and abrasion resisting performance of a polycrystalline diamond composite sheet are improved. Meanwhile, the chemical vapor depositiontechnology is utilized for sequentially depositing a silicon carbide layer and a silicon carbide-diamond gradient composite layer on the hard alloy surface, stress between the polycrystalline diamondlayer and the hard alloy base body is reduced, and the bonding strength of the polycrystalline diamond layer and the hard alloy base body is improved.

The invention discloses a film removing machine of fish bellies. The film removing machine of the fish bellies comprises a motor and a rotation brush (7) which is driven by the motor. A cross section of the rotation brush (7) on an outer end side of the position of brush of kernel is in a circular arch shape. The film removing machine of the fish bellies wholly is in a cyclic structure. The invention discloses a processing device of fish products, wherein processing device of the fish products used for wiping off black peritoneum in the fish bellies. The processing device structurally is composed of a base seat (1), a motor base (2), an adjustable-speed motor (3), a coupler (4), a bearing seat (5), a transmission shaft (6), a rotation brush (7), a protective cove (8) and the like. The transmission shaft is driven to rotate by the adjustable-speed motor through the coupler. A brush is installed on the transmission shaft, and the brush is used for rotating to remove the black peritoneum of the fish bellies. The rotating outline of the brush is in an arc shape to guarantee complete contact with a fish belly cavity. The brush of the kernel is made of soft plastic fabrics. When the belly film is wiped off, fish belly meat can not be hurt. The film removing machine of the fish bellies is simple in structure, low in cost, convenient to use, capable of greatly improving high efficiency of removing films, and reliable to work and strong in adaptability.

A shielding tail cover comprises a tail cover shell, a lining, a limiting sleeve, a crimping cylinder, a wire clamp and a screw, wherein a first step hole is formed in the tail cover shell, the lining is a tubular body internally provided with a step hole and externally provided with a cylinder, the limiting sleeve is a cylindrical body in which a plurality of wire core holes are formed, the lining is inserted into the wire core holes of the limiting sleeve, the limiting sleeve is arranged in the first step hole of the shell, the crimping cylinder sleeves an outer side of the lining, and two semi-circular arches of the wire clamp are buckled outside the crimping cylinder and are fastened by the screw. With a structure of arranging the lining in the shell, the problem of cable grounding is solved; the limiting sleeve is used for limiting axial movement of a cable; and with the adoption of the structure of the crimping cylinder and the wire clamp, the cable and the shell are fixed in a radial direction of the cable, so that the cable is stable and firm in connection, the phenomena that the cable is damaged and the shielding layer is damaged are prevented, and the shielding tail cover has the advantages of good shielding performance and high electromagnetic interference prevention capability.

The invention belongs to the field of an orthodontic medical appliance, and particularly relates to a movable self-locking support groove capable of regulating a gap with an arch wire and a tooth correction method thereof. The support groove comprises a support groove main body with different groove widths, a base and a sliding lock sheet, wherein the base is mechanically matched with the support groove main body in a movably dismountable way; the sliding lock sheet is arranged in the support groove main body; one end of the sliding lock sheet is provided with a screw rotating switch, and is used for regulating the gap between the bottom of the sliding lock sheet and the arch wire. The method comprises the following steps of according to different correction treatment stages, different support groove widths, torque angles, axial inclination angles and the arch wire in the required dimension are selected; the gap in the vertical direction and the horizontal direction is regulated; the low-friction environment in which the arch wire freely slides in the groove and the torque expression environment are created; by using the circular arch wire, the fast and regular arrangement of the teeth can be realized; by using the square arch wire, the torque expression and precise regulation and control of the tooth occlusion relationship can be realized; a personalized correcting appliance is provided for clinics; the movable self-locking support groove has the characteristics that the operation is convenient; the operation time beside a chair is reduced; the three-dimensional movement of the teeth is precisely controlled.

The invention relates to heat supply equipment, in particular to a biomass smoke-free combustion furnace. The biomass smoke-free combustion furnace is characterized in that a fuel conveying pipe (5) is connected above one section, outside a furnace body (1), of an air feeding pipe (7), a negative-pressure port (8) is formed at the upper side of one section of the air feeding pipe (7) entering a hearth (2), a wind pressing piece (11) which is bent obliquely towards the rear lower direction is arranged at the front edge of the negative-pressure port (8), the inner wall of the hearth (2) is a circular arch-shaped curved surface formed by a plurality of circular arch-shaped surfaces in a smooth connection mode, a settler (3) is arranged at one side of the hearth (2) above the air feeding pipe (7), the upper portion of the settler (3) is a circular arc box body, the lower portion of the settler (3) is a conical pipe, the lower end port of the conical pipe faces the negative-pressure port (8) of the air feeding pipe (7), a suction port (13) is arranged at the outer side of the settler (3), an opening at the inner side is connected with an air guide pipe (4), and the other end of the air guide pipe (4) is connected with an air inlet of a draught fan (6). The biomass smoke-free combustion furnace has the advantages that combustion air is hot air in the hearth, the temperature of the furnace is not lowered, fuel rotates and flies up and down and is not accumulated easily, the unburnt fuel is sucked to the air feeding pipe and is sprayed out again for combustion, and the heat of the furnace is accumulated continuously and reaches or approaches the heat of compressed straws or coal.

The invention provides an environment-friendly plastic runway without peculiar smell. The environment-friendly plastic runway comprises a water storage tank and a plug block; a plastic runway layer is located at the tops of water-permeable bricks, noctilucent coatings are distributed on the top end face of the plastic runway layer, and the connecting width of the noctilucent coatings is 1.22 m; multiple water-permeable bricks are adopted, the water-permeable bricks are of rectangular block structures and are laid on the top end faces of supporting bricks; three groups of water permeable holesare formed in the water-permeable bricks, and the bottoms of the water permeable holes are in circular arch shapes; the supporting bricks are of square block structures, a plurality of square drainage holes are formed in the tops of the supporting bricks, and the supporting bricks are laid on the top end face of a concrete layer. The environment-friendly plastic runway is beneficial to that during rainfall, rainwater is guided into the water-permeable bricks at the bottom through rainwater guiding holes in the plastic runway layer, and the occurrence of water accumulation at the top of the plastic runway layer is reduced, so that the top of the plastic runway layer is kept clean, and the running exercise requirement of people is met.