41 results about "CONVEX INSERT" patented technology

A prosthetic joint member includes: a generally concave cup with an outer surface that is bone-implantable, the cup including a first indexing feature; a concave insert disposed inside the cup, the insert comprising a rigid material and including a concave interior defining a nominal surface, the interior including a cantilevered flange defined by an undercut in the insert, the flange defining a wear-resistant first contact surface which protrudes inward relative to the nominal surface, the insert including a second indexing feature. The first and second indexing features engage each other so as to retain the insert in a fixed angular orientation relative to the cup.

The invention provides a circuit connector which comprises a convex insert and a concave inset that are matched with each other; the internal end of the convex insert is provided with a hollow insert component which can be inserted in an insertion space at the internal end of the concave insert; the circuit connector also comprises two first conductive sheets, two second conductive sheets and two end covers; wherein the first conductive sheets are arranged in the convex insert; the internal end of the first conductive sheets are arranged in the insertion component; the second conductive sheets are arranged in the concave insert; the internal end of the second conductive sheets are arranged in the insertion space; two end covers cover the external ends of the convex insert and the concave insert respectively; and each end cover is provided with at least two threading holes. When in use, the electric wire is penetrated the convex insert and is contacted with the two first conductive sheets; the electric wire is penetrated the concave insert and is contacted with the second conductive sheet; and when the insert component of the convex insert is inserted into the insertion space of the concave insert, the internal end of the first conductive sheet is contacted with the internal end of the second conductive sheet. Therefore, the connector can be used as a circuit so as to be connected with the circuit or the electric apparatus.

The invention discloses a spliced ​​thermal insulation board with adjustable thickness, which comprises a base layer, a surface layer and an insulation layer arranged between the base layer and the surface layer, expansion bolts are arranged on the inner side of the base layer, and expansion bolts are arranged on the inner side of the surface layer. Bolts and expansion bolts are respectively connected with connecting screws, and the two connecting screws are connected through an adjustable connecting sleeve. Cover plates covering the insulating layer are respectively arranged on the four end faces of the insulating layer. Protruding plugs and slots are respectively arranged on the upper and upper and lower end faces. The invention connects the base layer and the surface layer through a connecting screw and an adjustable connecting sleeve, can adjust the distance between the base layer and the surface layer, can reduce the bonding of glue, and has the effect of environmental protection; by setting the slot to insert the block The structure is convenient for splicing and installation, which can improve the fit between each insulation board, reduce the gap between each insulation board, and improve the aesthetics.

The invention discloses a window air conditioner with an overhaul safety switch, which comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger, an indoor fan, an outdoor fan, a shell and a baffle plate, wherein a contact type overhaul safety switch for controlling the switching-off of the air conditioner when the shell is opened is arranged on the shell and an internal machine. The overhaul safety switch has the structural characteristics that a concave slot switch is arranged at a wire inlet of a control box; a corresponding convex inserting strip is arranged in the corresponding position inside the shell; when the shell is assembled,the switch conducts the electricity in a switching-on state; and when the shell is disassembled, the inserting strip is separated from the slot, and the slot switch is in a switching-off state. In the window air conditioner of the invention, the safety is improved when an air conditioner maintainer works, the danger of electric shock and the like when a user disassembles or assembles the window air conditioner independently can be avoided, and the danger caused by electric leakage operation of the window air conditioner can be avoided because the body of the window air conditioner loosens in the processes of operating, transporting and the like.

The invention discloses a building frame structure, and belongs to the technical field of building structure engineering. The building frame structure comprises four vertical columns, beams, L-shaped plates and supporting plates, the beams are connected with the adjacent vertical columns, the vertical columns are concrete filled square steel tubes, the beams are H-shaped steel beams, the L-shaped plates are symmetrically arranged on two sides of web plates of the H-shaped steel beams, the supporting plates are positioned below the H-shaped steel beams, one outer L-shaped surface of each L-shaped plate is welded on the corresponding square steel tube, the other outer L-shaped surface of each L-shaped plate is connected with the web plates of the H-shaped steel beams in a bolted manner, one end of each supporting plate is a convex inserting end, the square steel tubes are provided with jacks matched with the inserting ends, the inserting ends are inserted into the jacks and welded on the square steel tubes, vertical reinforcing plates are arranged on the bottom surfaces of the supporting plates, and the top surfaces of the supporting plates are connected with lower flange plates of the H-shaped steel beams in a bolted manner. The building frame structure is higher in stability, and connectors are convenient to manufacture.

The invention relates to the technical field of mechanical equipment, in particular to a cylinder type sand mixing equipment. The cylinder type sand mixing equipment comprises a main machine box, a feeding assembly, a filtering assembly, a mixing assembly, a driving assembly and a discharging assembly. The mixing assembly comprises a main output shaft, a transmission seat, first rotary connection pieces, stirring rods, mixing plates, fixing racks and a locking piece. The locking piece comprises an outer shield plate, a guide rod, a gasket, a squeezing piece, an adjusting spring and convex inserting-connection side plates. Each fixing rack comprises a rotary connection ring, a main ejection seat, a sub-ejection rod, a first rotary connection head, auxiliary rods and clamping connection heads; a first guide hole is formed in the axial direction of the main ejection seat in a penetrating mode; a first installing groove is formed in the first rotary connection head in a concave mode; a first connection thread is arranged on the side wall of the first rotating connection groove in an internally spiral and concave mode. The cylinder type sand mixing equipment is convenient to operate and adjust, high in sand mixing efficiency and good in sand mixing quality.

The invention discloses a multi-functional assembled goods shelf which includes a left bottom plate (1), a right bottom plate (2), an assembly plate (3), inserting-connecting parts (4) of type I, inserting-connecting parts (5) of type II and inserting-connecting parts (6) of type III. The left bottom plate (1), the right bottom plate (2) and the assembly plate (3) are provided with convex inserting-connecting grooves (11) or concave inserting-connecting grooves (8, 15). The inserting-connecting parts (4) of type I can fix four of the convex inserting-connecting grooves (11) in inserting and connecting modes, the inserting-connecting parts (5) of type II can fix three of the convex inserting-connecting grooves (11) in inserting and connecting modes, and inserting-connecting parts (6) of type III can fix one of the convex inserting-connecting grooves (11) and one of the concave inserting-connecting grooves in inserting and connecting modes. Boards are fixed to each other through inserting and connecting of the inserting-connecting parts and the inserting-connecting grooves, and are assembled into the multi-functional assembled goods shelf without using any tools. The multi-functionalassembled goods shelf can be assembled into various shapes according to requirements and site conditions, and has good practicability.

The inventio discloses a cement component crossing a highway and a mounting method and belongs to the field of road construction. At present, when a traditional cast-in-place manner is adopted for construction, the construction process is tedious, the construction plant requirement is high, the construction period is laggard, and the maintenance cost is high. The cement component crossing the highway comprises a fabricated box culvert (1), and a convex inserting groove (2) is machined in an end opening of a top mold of the fabricated box culvert; a convex clamping groove (3) with an annular gap is machined in a bottom end opening of the fabricated box culvert, and the convex clamping groove is inserted into the convex inserting groove in another fabricated box culvert; PE pipes (4) for forming prestressed tendon pore ducts are arranged at the four corners of the convex inserting groove, the PE pipes are linearly buried in the four corners of the upper portion of the fabricated box culvert, and then pore ducts (5) are preserved in the four corners of the pipe joints of the PE pipes; steel strands penetrate through the pore ducts, tensioning is carried out, and joint treatment and pore duct grouting are carried out after tensioning is completed; and then wing wall treatment and culvert side backfilling are carried out.

This invention discloses a board-to-board connector that electrically joints two circuit boards. This connector is composed of a socket and a pin. The pin includes the first insulator containing some the first conducting end. Every conducting end sets a pyramid convex at proper position; the convex has a pointed top, therefore, as plugging the first conducting end into the first insulator, the convex inserts into the first insulator and does not scurf the plastic matter of the first insulator. A manufacturing method of this pin is also.

The invention discloses an inflation tube framework for a greenhouse. The inflation tube comprises gas network tubes, gas nipples, convex inserting joints, concave inserting joints and ground inserting rods, wherein the convex inserting joints are fixedly connected to the rear parts of the gas network tubes; the gas nipples are connected to the gas network tubes and are used for inflating the gas network tubes, thereby forming the inflation tube framework for the greenhouse; ground inserting lugs are fixedly connected to two ends of the gas network tubes; the ground inserting rods can be inserted into the ground inserting lugs by the two ends of the gas network tubes; the inflation tube framework for the greenhouse is fixedly connected with filed; the gas network tubes are made of flexible plastic or flexible rubber; and according to the greenhouse framework formed by connecting a plurality of groups of inflation gas network tubes together by using the convex inserting joints and the concave inserting joints, part of material is replaced by air, so that the cost of the greenhouse material and the construction cost are reduced and energy saving, emission reduction and environment friendliness are facilitated.

A new and improved insert ring for a wafer support inside a processing chamber for the processing, particularly dry etching, of semiconductor wafer substrates. The insert ring includes a generally convex inner surface which faces the wafer support and defines a gap or berline wall between the insert ring and the wafer support. In one embodiment, the convex inner surface is convexly-tapered. In another embodiment, the convex inner surface is convexly-curved. Throughout etching of multiple successive substrates on the wafer support, accumulations of polymer material on the inner surface of the insert ring are prevented or at least substantially reduced. Consequently, polymer peeling is eliminated or reduced and operational intervals for the processing chamber or system between periodic maintenance or cleanings, are prolonged.

The invention introduces a door structure of rail transit vehicle, comprising automatic door and carriage bottom plate so on, characterized in that an assistant footplate with corresponding width of in-out port of automatic door and linked by convex inserting shaft at one side of the bottom of automatic door is designed under the carriage bottom plate; a group of symmetrical arc sliding grooves for left and right automatic doors sliding is set on the assistant footplate; the assistant footplate is reverse T-shape and the tail is set in the sliding groove constituted by two locating groove plates set in left and right. The implement of door structure can eliminate the black groove formed by vehicle body and platform when vehicle stops and passengers get up and down. It is very beneficial for guaranteeing the safety of up-down passenger and improving safe running of rail vehicle.

The invention relates to a barrelled water dispenser, comprising a water outlet sleeve, wherein the water outlet sleeve has an opened concave cavity which can be inserted by an opening part of a reversed barrel body, an upwardly-convex insert pipe is arranged in the center of the concave cavity, the top of the insert pipe is sealed, and a through hole is vertically arranged on a side wall of the insert pipe; a locking component, wherein the water outlet sleeve and the opening part of the barrel body are locked together by the locking component; and a water outlet faucet, wherein the water outlet faucet is communicated with the insert pipe of the water outlet sleeve through a water pipe. The invention solves the problem that people are inconvenient to drink the barrelled water out of doors; and meanwhile, compared with a traditional water dispenser, the water dispenser has the characteristics of simple structure and low cost, and the water dispenser is convenient to carry, and easy to disassemble and clean. Thereby, the invention is suitable for outdoor activities on a construction site, a playing court and the like, and is suitable for temporary mobile work places.

An inner-filtering bag-type deduster comprises a dedusting box, and a filtering bag and fixing components thereof which are arranged in the inner cavity of the dedusting box, wherein the fixing components comprise a bag mouth fixing framework and a convex insert matched with the bag mouth fixing framework and used for fixing the filtering bag mouth; four sides of the bag mouth fixing framework arefixed on the inner wall of the dedusting box in a sealed manner; a plurality of lines of bag mouth receiving through grooves are cut in the middle of the bag mouth fixing framework; the filtering bagis a connected bag with serial bag structure, and upper filter drums of the connected bag are connected or separated; and the lower part of the connected bag is a public bag mouth, and the edge of the public bag mouth is pressed by the convex insert so as to be clamped on the sides and the lower plane of edges of the bag mouth receiving through grooves; and the convex insert and the bag mouth fixing framework are coupled to form an integral body. The manufacturing of the inner-filtering bag-type deduster is simple and convenient without the use of high-precise equipment, and especially, the processing of the connected bag is simpler, thus not only saving materials, and reducing manufacturing cost, but also reducing labor intensity of workers.

A heater supporting device for use in a semiconductor manufacturing apparatus is provided so as to improve the uniformity of a temperature property and the expected lifespan by preventing support pieces from being damaged and separated from piece holders, and preventing deterioration in adiabatic efficiency in the vicinity of a ceiling of a vertical type furnace. A heating element of a coil shape is disposed around an object. The support pieces are vertically connected in multiple. Hollows of an elliptical shape are formed between the respective support pieces. Concave insertions are formed on one of upper and lower surfaces of the respective support pieces, and convex insertions are formed on the other one of the upper and lower surfaces of the respective support pieces. The convex insertions are insert-fitted with the concave insertions. The support pieces are vertically connected in multiple by insert-fitting the concave insertions to the convex insertions.

The invention discloses a winding disc structure of a steel wire winding machine, which mainly comprises a winding disc, and a plurality of groups of steel wire storage wheel assemblies which are uniformly and fixedly arranged on the periphery of the winding disc. Each steel wire storage wheel assembly mainly comprises steel wire storage wheels, a connecting shaft, clamp plates, steel wire storage wheel shafts and self-lock pins. One end of the connecting shaft is fixedly connected with the winding disc through a bolt; the clamp plates are pairwise arranged at the other end of the connecting shaft at equal intervals; the center of the connecting shaft, at 2 / 3 height of each clamp plates, is provided with a U-shaped groove; and a self-lock pin clamping hole and a self-lock pin key slot are respectively arranged at two radial ends of the upper end part of each clamp plate. Bosses matched with the U-shaped grooves are arranged at two ends of the steel wire storage wheel shafts; axial key slots are arranged on outer walls of the two ends of the steel wire storage wheel shafts; the steel wire storage wheels are rotationally sheathed on the steel wire storage wheel shafts; and the steel wire storage wheel shafts and the clamp plates are mutually and movably connected in a concavo-convex inserting way. The winding disc structure can improve the labor productivity by more than ten times, and can guarantee the product quality of tubular products.

Disclosed is a mine bucket tooth. The mine bucket tooth comprises a hollow triangular conic sleeve body used for being connected with a bucket tooth base in a sleeving mode. A granular cemented carbide welding layer formed by welding building up is surrounded by the whole cone tip head part of the triangular conic sleeve body. External convex inserting and connecting blocks located in the middle of each bottom edge are correspondingly connected with the four bottom edges of the triangular conic sleeve body. Positioning through holes used for fixing the bucket tooth base are formed in the triangular symmetrical side edges of the triangular conic sleeve body correspondingly. The upper outer wall surface of the triangular conic sleeve body is provided with at least two outer convex stepped toruses. The middles of the front and back conical surfaces of the triangular conic sleeve body as well as the lower portion of the granular cemented carbide welding layer located on the stepped torusesare provided with raised square blocks. The raised square block on one side is connected with a sleeve ring arranged vertically. The cone tip head part of the triangular conic sleeve body is a narrowlong-strip end face provided with the granular cemented carbide welding layer in a covered mode. The mine bucket tooth has the characteristics that the structure is simple and reasonable, using is convenient, the wear resistance of the product surface can be increased, the strength is high, the fastness is high, and the product service life and use efficiency can be improved.

The invention discloses multifunctional compasses, which comprise two compasses legs (1) and (2) and a countersunk locking device (3). Length graduations are arranged on the compasses legs (1) and (2), the compasses leg (1) is a concave sunk groove, the compasses leg (2) is a convex insert, and the compasses leg (1) is connected with the compasses leg (2) by the countersunk locking device (3). Angular graduations are arranged at one of connecting ends of the two compasses legs while a pointer (4) is disposed at the other connecting end. The multifunctional compasses have multiple functions and are convenient and practical, and time and labor are saved.

The invention discloses a building frame with high-stability beam-column joints, and belongs to the technical field of building structure engineering. The building frame comprises four vertical columns, beams and two supporting plates, the beams are connected with adjacent vertical columns, the vertical columns are concrete filled square steel tubes, the beams are H-shaped steel beams, the supporting plates are positioned above and below the H-shaped steel beams respectively, one end of each supporting plate is a convex inserting end, the square steel tubes are provided with jacks matched with the inserting ends, the inserting ends are inserted into the jacks and welded on the square steel tubes, a vertical reinforcing plate is arranged on one surface of each supporting plate, the other opposite surface of each supporting plate is a mounting surface, and the mounting surfaces of the two supporting plates are connected with upper flange plates and lower flange plates of the H-shaped steel beams in a bolted manner. The building frame is higher in stability, and connectors are convenient to manufacture.

A buckle insertion connector and an application thereof belong to the connection technology field. The connector comprises a concave connecting substrate and a convex connecting substrate; the connector is characterized in that the concave connection substrate is connected to a concave buckle member in a separable way; the convex connecting substrate is connected to a convex inserting member in a separable way; the convex inserting member is inserted inside the concave buckle member; arc-shaped convex pieces of the convex inserting member are set inside a concave cavity body of the concave buckle member; an inserting piece of the convex inserting member is set inside a guide inlet of the concave buckle member; and the furthest distance between arcs of the two arc-shaped convex pieces is larger than the distance between upper ends of two guide pieces and arc sleeve connecting position. According to the invention, the buckle insertion connector can be applied to connections of liner-type buckle insertion, cover right-angle type buckle insertion and touch edge turn angle type buckle insertion; by inserting the elastic convex inserting member into the concave buckle member, tight buckle inserting connection between two plates or sectional plates are realized; the buckle force is moderate; the removal and assembly are convenient; and the effects of eliminating weld, glue and nail are realized, thus time and effort are saved.

The invention relates to a nest simulation solidified raw soil combination flowerpot used on an office table partition. The nest simulation solidified raw soil combination flowerpot is provided with asupport, a cross plate, a tray, a water culture flowerpot body, a soil culture flowerpot body and a water guide rope, and the support and the cross plate are metal plates of which the surfaces are provided with screw holes and are connected together through bolts; the tray, the water culture flowerpot body and the soil culture flowerpot body are made of a polymer sulphoaluminate cement solidifiedraw soil composite material, the outer surfaces are coarse, deadwood-shaped fiber is exposed, the periphery of the tray is folded upwards, concave and convex inserting openings are formed in the leftend and the right end of the tray, the water culture flowerpot body and the soil culture flowerpot body are in a nest shape, the water culture flowerpot body is placed in the soil culture flowerpot body, a rope penetrating hole is formed in the upper end of the water culture flowerpot body, the water guide rope penetrates through one end of the rope penetrating hole to be immersed into water of the water culture flowerpot body, and the other part of the water guide rope is buried into the soil culture flowerpot body. The nest simulation solidified raw soil combination flowerpot is ecologically and environmentally friendly, and the space above the office table partition is effectively utilized; moreover, the water is supplied to the soil culture flowerpot body through the water guide rope,a hole does not need to be formed in the bottom of the flowerpot to avoid excessive watering like a traditional flowerpot, and thus water spilling and pollution to the office table top are avoided.

The invention relates to an anti-misoperation device of a low voltage measuring cabinet. The anti-misoperation device comprises an isolation bracket which can be arranged on knife switches of a distribution board switch blade so as to effectively isolate an electrical part hung on the head of the switch blade, wherein an insulation connecting wire which can be connected with a ground wire is connected to the isolation bracket, the isolation bracket is a flat frame bracket, and two vertical partition boards are arranged in the middle of the flat frame bracket; a triangular connecting sheet is connected with a position between the two partition boards, and a connecting end part of the insulation connecting wire is in series connection with the triangular connecting sheet; the triangular connecting sheet is an isosceles triangle connecting sheet which is in inserted connection with corresponding inserting holes or grooves in the two partition boards through convex inserting end parts which are respectively arranged at two symmetrical angles, and a connecting end part of the insulation connecting wire is in series connection with the triangular vacancy position in the center of the isosceles triangle connecting sheet; the anti-misoperation device has the characteristics that the potential safety hazards due to misoperation caused by the condition that the low voltage measuring cabinet is powered off, an electric energy meter is exchanged, and a current transformer is exchanged are prevented.

The invention discloses an iron with a needle and thread storage bucket. The iron with the needle and thread storage bucket comprises an iron body, a handle device and the needle and thread storage bucket, wherein the handle device is in an arch shape and is arranged at the upper end of the iron body, the needle and thread storage bucket is arranged between the handle device and the iron body, one end of the needle and thread storage bucket is fixed to the upper end face of the iron body, the other end of the needle and thread storage bucket is connected to the lower end of the handle device, storage drawers which can be opened through rotation are arranged on the two sides of the needle and thread storage bucket, one end of each storage drawer is hinged to the needle and thread storage bucket, a convex inserting and clamping piece is arranged at the other end of each storage drawer, and each convex inserting and clamping piece is connected with a corresponding clamping groove formed in the wall of the needle and thread storage bucket. In this way, due to the fact that the needle and thread storage bucket is additionally arranged on the iron body, needlework tools can be stored, and damaged clothes can be sewn in time as long as the damaged clothes are found during ironing.

The invention discloses a wall thermal insulation fireproofing pouring module with the inner layer holed to be filled with foamed concrete. Two protrusions arranged along the entire upper edge are arranged at the upper end of an outer side module piece, a concave inserting connection rabbet is formed between the two protrusions, two recessed parts arranged along the entire lower edge are arranged at the lower end of the outer side module piece, and the two recessed parts are in convex inserting connection. A notch is formed in the side edge of the outer side module piece. A limiting groove formed along an entire extending part is formed in the inner side wall of the extending part. A side edge protrusion is formed on the side edge of the other end of the outer side module piece, and the two surfaces of the side edge protrusion are respectively provided with a limiting protrusion. A plurality of holes penetrating through the front face and the rear face of an inner side module piece are formed in the inner side module piece. An inner module piece protrusion is arranged at the upper end of the inner side module piece, an inner module piece recessed part is arranged at the lower end of the inner side module piece, an inner module piece protrusion is arranged on the left side of the inner side module piece, and an inner module piece recessed part is arranged on the right side of the inner side module piece. Dovetail grooves which penetrate through the entire surface up and down are further formed in the front face and the rear face of the outer side module piece and the front face and the rear face of the inner side module piece. The wall thermal insulation fireproofing pouring module has the advantages that assembling is convenient, and cracking and mildewing cannot happen to a wall easily.

The invention discloses a multi-purpose assembly type goods shelf assembling plate. The assembling plates (3) are assembled with left bottom plates (1), right bottom plates (2), I type inserting parts(4), II type inserting parts (5) and III type inserting parts (6) to form a multi-purpose assembly type goods shelf; convex inserting grooves (11) or concave inserting grooves (8 and 15) are arrangedin the left bottom plates (1), the right bottom plates (2) and the assembling plates (3); four convex inserting grooves (11) can be inserted and fixed on each I type inserting part (4), three convexinserting grooves (11) can be inserted and fixed on each II type inserting part (5), and one convex inserting groove (11) and one concave inserting groove can be inserted and fixed on each III type inserting part (6); and the plates are fixed together through the inserting connection of the inserting parts and the inserting grooves, and are assembled to form the multi-purpose assembly type goods shelf, no tools are needed, the multi-purpose assembly type goods shelf can be assembled into various shapes according to demands and site conditions, and thus the good practicability is obtained.

The invention relates to the technical field of vehicle part machining, in particular to a vehicle air chamber bracket fixing fixture. The vehicle air chamber bracket fixing fixture comprises a base and a convex insert; a fixed base is arranged above the base; a small-diameter end of the insert penetrates through a through hole in the middle part of the fixed base, and is fixedly connected with the base; a first groove is formed in the middle part of the fixed base; a gap is formed in the upper part of the first groove, and is provided with a similar n-shaped pressing device; a second groove is formed in the side wall of the first groove; a third groove is formed under the first groove; and a first thread hole is formed in the top of the pressing device. The base of an air chamber bracketis fixed by the fixed base; a support arm extends out from the gap; after the pressing device presses the air chamber bracket, the air chamber bracket is fixed by a first screw rod; and finally, an outer circle of the base and each hole are machined. The vehicle air chamber bracket fixing fixture once clamps workpieces to realize synchronous machining of the outer circle and each hole, improves the machining precision, reduces the product rejection rate, relieves the labor intensity, and improves the working efficiency.

The invention provides a novel hub type assembly type scaffold and a fastener. The novel hub type assembly type scaffold comprises a horizontal rod, an inclined rod, a vertical rod, a hub type circular wheel disc, an upper sealing cover plate and a lower sealing cover plate. A concave inserting groove I and a concave inserting groove II are formed in the hub type circular wheel disc, the horizontal rod is connected with the concave inserting groove I in an inserted mode through a convex inserting head I, the inclined rod is connected with the concave inserting groove II in an inserted mode through a convex inserting head II, and the upper sealing cover plate and the lower sealing cover plate are connected through an external thread layer on the vertical rod in a bolted mode. Through the connecting mode, the flexibility of the erecting mode of the scaffold can be achieved, the problem that the fastener is prone to being lost in the construction process can further be solved, and the construction progress is accelerated. Rubber layers are pasted on the upper sealing cover plate and the lower sealing cover plate, the bearing capacity of connecting joints of the novel hub type assembly type scaffold can be met, and brittle failure of the connecting joints can further be avoided. The quality of prefabricated parts can be guaranteed, the construction period is shortened in the assembly construction process, and the cost is saved.

The invention discloses a multifunctional compass. The multifunctional compass comprises two compass legs (1) and (2) with length marks, and a countersunk locking device (3), wherein the compass leg (1) is a concave sunk groove, while the compass leg (2) is a convex insert block, and the compass leg (1) and the compass leg (2) are connected by virtue of the countersunk locking device (3); at the connection ends of the two compass legs, one connection end is provided with angle marks, while the other one connection end is provided with a pointer (4). The multifunctional compass has multiple functions, and is convenient and practical, and capable of saving time and labor.