58 results about "Sharp tooth" patented technology

The invention discloses a telescopic dry cleaning rolling brush of a photovoltaic power station, and relates to the technical field of dry cleaning rolling brushes, the telescopic dry cleaning rolling brush comprises a box body, a cleaning groove is formed in the bottom surface of the box body, a brush roller is rotatably arranged in the cleaning groove, a collecting groove is formed in the side wall of the cleaning groove, a fixing plate is fixedly connected to the top of the collecting groove, and the fixing plate is obliquely arranged; a plurality of tooth-shaped scraping rods are evenly and fixedly connected to the end of the fixing plate, and the ends, close to the brush roller, of the tooth-shaped scraping rods are low. According to the photovoltaic module cleaning device, in the process that the brush roller cleans a photovoltaic module, the tooth-shaped scraping rod can remove dust and dirt on the brush roller, so that the brush roller is kept in a clean state all the time, blockage caused by excessive accumulation of the dust and the dirt on the brush roller is prevented, and the cleaning effect of the brush roller is improved; the sharp tooth-shaped edge of the tooth-shaped scraping rod can penetrate into tiny gaps and concave-convex surfaces which are difficult to touch by the brush roller, so that the tooth-shaped scraping rod can scrape stubborn dirt and residues attached to the brush roller, the cleaning effect is ensured, and cleaning is more thorough.

A thread rolling plate for producing self-tapping and self-locking screws comprises a main thread plate and an auxiliary thread plate. Working faces are arranged on the main tooth plate and the auxiliary tooth plate, and each working face is provided with a collecting part and a shaping part. The shaping part is provided with a high thread groove, a low thread groove, an upper square tooth groove and a lower square tooth groove. Thread rolling edges are arranged between the high thread grooves, the upper square tooth groove comprises a first tooth groove and a second tooth groove, and the lower square tooth groove comprises a third tooth groove and a fourth tooth groove. The high thread grooves and the low thread grooves are formed in the working face, two kinds of threads with different heights are formed at a time, and the self-locking performance of the screw is enhanced. The upper square tooth groove and the lower square tooth groove form a first self-locking block, a second self-locking block, a third self-locking block and a fourth self-locking block in the tooth rolling process, and the self-locking performance is improved. The sharp tooth groove and the flower tooth part are arranged on the main tooth plate, so that the cutting and chip removal performance of the screw is improved. The thread rolling plate can be used for machining screws with threads of various functions and specifications under one-time thread rolling, and the machining efficiency is greatly improved.

The utility model relates to the technical field of diamond compacts, in particular to a polycrystalline diamond compact, which comprises a diamond substrate and a polycrystalline cutting layer, the diamond substrate is positioned under the polycrystalline cutting layer, and a round cutting surface is arranged on the surface of the polycrystalline cutting layer and comprises a plurality of cutting sharp teeth. A plurality of cutting sharp teeth are evenly distributed on a round cutting face, the whole cutting sharp teeth are of a conical structure and are integrally formed, each cutting sharp tooth comprises a plurality of plane parts, the tops of the plane parts abut against one another to form a cutting included angle, the cutting sharp teeth can be of a triangular pyramid structure as a whole, and therefore the cutting sharp teeth can be used for cutting a workpiece. Triangular stress is achieved through the triangular pyramid structure, the stress stability is ensured, the abrasion resistance and impact resistance of the diamond compact can be effectively improved, and then the service life is effectively prolonged.

The olivary nucleus scissors comprise a first scissor handle and a second scissor handle which are hinged to each other, the head portion of the first scissor handle is a shearing portion with a blade, the head portion of the second scissor handle is an annular limiting portion used for being arranged on an olivary nucleus in a sleeved mode, and sharp teeth are arranged on the inner ring of the annular limiting portion. Steps are arranged between the sharp teeth and the side face, away from the shearing part, of the annular limiting part, and the sharp teeth with the thickness smaller than that of the annular limiting part can be closer to the shearing part through the steps. According to the utility model, the step is arranged, so that when the olivary nucleus is sheared, the stress point of the sharp teeth on the olivary nucleus is closer to the shearing part, the shearing is more stable, and the olivary nucleus is not easy to pop out during shearing.

1. The name of this design product: Kitchen Knife (Sharp Tooth Series). 2. Purpose of this design product: used for cutting and preparing food in the kitchen. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the key points of the design: main view. 5. The design points of the left view and the right view have been reflected in the stereoscopic figure 1 and the stereoscopic figure 2 respectively, and the left view and the right view are omitted.

The invention provides a multi-clamping-prevention PDC drill bit. The multi-clamping-prevention PDC drill bit comprises a drill bit body, a plurality of blades are arranged on the drill bit body at intervals, chip grooves are formed between the adjacent blades, stop block clamping prevention units are arranged in the chip grooves, fishtail-shaped clamping prevention units are arranged at the roots of the blades, and composite sheets and conical sharp teeth are arranged on the fishtail-shaped clamping prevention units. By means of the fishtail-shaped anti-clamping unit, fixed large falling blocks, key grooves and borehole steps can be subjected to back-scratching finishing, cutting and even crushing during lifting and back-scratching; the conical sharp teeth can be used for carrying out stress concentration crushing on falling blocks which are easy to move, so that the sizes of the falling blocks are reduced; by means of the stop block anti-blocking unit, large falling blocks falling from an upper well hole can be subjected to stress concentration crushing, the large falling blocks are prevented from falling into the well bottom and blocking a drill, existing falling blocks can be subjected to stress concentration crushing, the size of the falling blocks is reduced, and the falling blocks can be conveniently returned out in time. According to the invention, the occurrence probability of drill jamming can be reduced, the back-scratching jam releasing capability is improved, and the drilling period and cost are reduced.

1. The name of this design product: sharp-toothed cutter disc. 2. Purpose of this design product: This design product is used for grinding coffee beans. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the key points of the design: Design 1 Stereoscopic Drawing 1. 5. Designate Design 1 as the base design.

The utility model discloses a sharp-tooth step type drill bit which comprises a drill bit base body and a drill bit crown arranged at the top of the drill bit base body. A plurality of groups of blades are arranged on the drill crown at intervals, three groups of cutting teeth are arranged on each group of blades, the three groups of cutting teeth are arranged in a stepped manner from top to bottom, the widths of the cutting teeth are gradually increased from top to bottom, a water outlet is formed in the outer wall of the drill crown between adjacent blades, and an inner water tank is formed in the inner wall of the drill crown between adjacent blades. And the inner water tank is connected with the water outlet. The drill bit has the advantages that the drill bit effectively cuts into rocks to form volume breaking, the slipping phenomenon can be reduced, and the drilling perpendicularity and the drilling efficiency can be improved; the heat on the cutting teeth is taken away in time, the temperature of the drill bit is reduced, and the service life of the drill bit is prolonged.

The application discloses a construction method for removing concrete around a cross-shaped steel plate joint of a diaphragm wall, which comprises the following steps: drilling a hole; grabbing a groove; installing a soil retaining member; tightly attaching a sharp tooth to the cross-shaped steel plate joint; moving up and down a grab bucket of a grooving machine to break the whole concrete structure around the cross-shaped steel plate joint; hanging a wall shoveling device on the grab bucket of the grooving machine, moving up and down the grab bucket of the grooving machine to shovel off the remaining concrete around the cross-shaped steel plate joint; replacing the wall shoveling device with a wall brushing device, tightly attaching the wall brushing device to the cross-shaped steel plate joint by the grab bucket of the grooving machine, and moving up and down the grab bucket of the grooving machine to completely remove the residual concrete around the cross-shaped steel plate joint. The construction method for removing the concrete around the cross-shaped steel plate joint of the diaphragm wall is suitable for removing the concrete around the cross-shaped steel plate joint of the diaphragm wall in a narrow space, the steps are reasonably designed, the steps are closely combined, the concrete around the cross-shaped steel plate joint of the diaphragm wall is completely removed, the construction difficulty is reduced, and the construction efficiency is improved.

The utility model discloses a coal mine exploration drill bit, and particularly relates to the technical field of drill bits, which comprises a drill bit body, three mounting racks are arranged on the outer wall of the drill bit body, a mounting shaft is arranged at the end of each mounting rack, a cone is mounted on each mounting shaft, and a plurality of layers of crushing teeth are arranged on the surface of each cone. The crushing teeth comprise sharp teeth and steel teeth, the sharp teeth and the steel teeth are alternately distributed on the surface of the cone, a threaded rod is fixed to the top of the drill bit body, the multiple layers of crushing teeth are embedded and fixed to the surface of the cone through the cone structure, and each layer of crushing teeth comprises the multiple sharp teeth and the multiple steel teeth which are alternately distributed. In the rotating process of the roller cone, due to the fact that the interval distance between the sharp teeth and the steel teeth is short, the sharp teeth and the steel teeth can rapidly and continuously make contact with soil and break and dig the soil, and compared with a traditional roller cone bit, the roller cone bit is beneficial to improving the efficiency of breaking a soil layer at the same rotating speed.

Apparatus, consisting of a hinge (84) defining a hinge axis (88), and a pair of opposing jaws (80A,80B), including a movable jaw and a fixed jaw having a predetermined part radiopaque, so that the fixed jaw location is identifiable from a fluoroscopic image of the fixed jaw. The opposing jaws terminate at proximal and distal regions, and the proximal regions are connected to the hinge so that the movable jaw rotates about the hinge between a closed state and an open state. The jaws are curved in planes parallel to the hinge axis, and terminate in narrowed ends at the distal regions, so that in the closed state the jaws grip sections of vertebrae. The apparatus also has a support structure (60) that retains the hinge and the pair of opposing jaws, and a multiplicity of sharp teeth (98) disposed on respective inner surfaces of the opposing jaws.

The present invention relates to the technical field of sealing pipe joints, and in particular to a sealing flange joint for an R744 refrigerant high-pressure air-conditioning pipeline, comprising a male joint, a female joint, a gasket and a sealing ring. The male joint is fixedly mounted on the end of pipe one, and the female joint is fixedly mounted on the end of pipe two. A first convex ring is protruding from the end face of the male joint, and at least one circle of first sharp teeth is provided on the end face of the first convex ring. A sealing countersunk hole is provided on the end face of the female joint, and a sealing ring mounting groove is provided on the hole wall of the sealing countersunk hole, and at least one circle of second sharp teeth is provided on the bottom surface thereof. The gasket is made of soft metal, and the sealing ring is mounted in the sealing ring mounting groove and sleeved on the first convex ring. The male joint and the female joint are tightly connected, and a soft and hard dual combination seal is realized at the same time, which greatly improves the sealing performance and safety performance of the air-conditioning pipeline, adapts to the sealing connection under high vibration conditions, and the gasket deforms evenly, meeting the use requirements of convenient disassembly and assembly in a limited space, and the gasket or the sealing ring is easy to replace.

The utility model discloses a belt sander sharp-tooth rubber wheel for polishing, which belongs to the technical field of gears and comprises a hub, rubber sharp teeth are detachably sleeved on the periphery of the hub, and each rubber sharp tooth comprises a tooth tip portion and a pressing portion. A boss is integrally formed on the inner side wall of the tooth tip part, one side of the hub is inserted into the boss, the other side of the hub is connected with a pressing part through a quick release assembly, and the outer side wall of the pressing part abuts against the inner side wall of the tooth tip part. And a plurality of anti-rotation blocks are arranged between the tooth tip part and the hub. According to the sharp-tooth rubber wheel of the belt sander for polishing, the sharp-tooth rubber which is abraded unevenly or damaged can be replaced conveniently, so that the service life of the sharp-tooth rubber wheel is prolonged, and the using effect of the sharp-tooth rubber wheel is guaranteed.

The utility model relates to the field of bucket wheels, and discloses a bucket wheel device of a stacker-reclaimer, which comprises a large arm, a dust cover fixedly connected to the left side of the rear end of the large arm, a bearing fixedly sleeved on the outer wall of the dust cover, a rotating drum fixedly sleeved on the outer ring of the bearing, the dust cover rotatably connected with the rotating drum through the bearing, and a motor fixedly mounted in the dust cover. The left end of an output shaft of the motor is fixedly connected with the inner wall of the left side of the rotary drum, the outer wall of the rotary drum is fixedly connected with a plurality of material taking hoppers, the material taking hoppers are evenly distributed around the outer wall of the rotary drum at equal angles, and the material taking hoppers are in clearance fit with the outer wall of the rotary drum. A plurality of small sharp teeth and three large sharp teeth are evenly and fixedly connected to the outer edge of an opening of the material taking hopper, and the three large sharp teeth are distributed on the side edge of the outer edge of the opening of the material taking hopper and the middle of the outer end edge.

The utility model discloses an easy heat dissipation dry cut diamond saw blade, which comprises a base body, a mounting hole is arranged at the center of the base body, a plurality of heat dissipation holes are arranged around the mounting hole, an edge of the base body is provided with a cutting part, the cutting part is in the shape of a ring body, the thickness of the cutting part is greater than that of the base body, the front and back surfaces of the cutting part are both provided with a plurality of annular arrayed protrusions one and protrusions two, the protrusions one and the protrusions two are both polygons, the protrusions one are in the shape of a bend, the bending angle is 90-150 degrees, the edge of the bending part one of the protrusions one extends along the edge of the cutting part, the protrusions two are located on the inner side of the protrusions one, and one corner of the protrusions two extends to the inner edge of the cutting part. The protrusions one and the protrusions two on the cutting part are mutually matched and arranged in an annular array, the sharp teeth at the bending part one of the protrusions one can improve the cutting sharpness of the edge of the cutting part, the groove between the protrusions one and the protrusions two can form a blade edge, the biting force of the surface of the cutting part is improved, and the groove is also convenient for chip removal and heat dissipation.

The invention belongs to the technical field of power distribution cabinet machining, and particularly relates to a power distribution cabinet plate cutting device which comprises a workbench, a disc cutting knife is rotationally arranged on the table top of the workbench, a rotating shaft is rotationally arranged in the workbench, and the disc cutting knife is fixed to the surface of the rotating shaft. Through composite cooling of the middle part and the cutting part of the disc cutting knife, the working temperature of the disc cutting knife can be effectively controlled, so that the tooth blade of the disc cutting knife always keeps stable hardness performance, the bonding wear between the tooth blade of the disc cutting knife and a plate is reduced, the passivation speed of the cutting edge is delayed, and meanwhile, the service life of the cutting edge is prolonged. According to the composite cooling design, overall heat accumulation of the disc cutting knife is restrained through middle pre-cooling, the temperature of a core cutting area is directly reduced through precise cooling of the cutting part of the disc cutting knife, the abrasion rate of the cutting knife is greatly reduced under the dual action, the disc cutting knife keeps sharp tooth blades, and the cutting efficiency is improved. And the disc cutting knife keeps precise shearing, and the stability of the finished product rate of cut plates is kept.

The invention belongs to the field of cable recycling, and particularly relates to a cable recycling device for a single-core cable, which comprises a rotating wheel assembly provided with sharp teeth, a cable passing channel is formed in the rotating wheel assembly, and tooth holes which are in one-to-one correspondence in the vertical direction are formed in the upper side and the lower side of the cable when the cable passes through the rotating wheel assembly. The cable is transmitted to the space between an upper cutting wheel and a lower cutting wheel which are adjustable in distance and opposite in rotation direction after being perforated, the upper cutting wheel and the lower cutting wheel cut a sheath layer on the upper side and the lower side of the cable along the center line position, and the cut cable is divided into a left sheath, a cable core and a right sheath; the left protective sleeve and the right protective sleeve are tensioned by a conveying roller assembly on the rear portion, a shearing assembly is arranged on the conveying roller assembly, a sliding piece capable of sliding in a reciprocating mode is arranged on the shearing assembly, and a clamping piece and a shearing piece are arranged on the sliding piece. The service life of the cutting wheel assembly and the service life of the sectioning mechanism can be prolonged, so that the maintenance interval is reduced.

The utility model discloses a general packaging mould box for optocoupler products, which relates to the technical field of optocoupler product packaging and comprises a lower mould box and an upper mould box, a charging barrel module is arranged in the middle of the top of the lower mould box, and a first sealing mould frame and a second sealing mould frame are arranged in the lower mould box and the upper mould box respectively. The first sealing mold frame and the second sealing mold frame are arranged on the two sides of the charging barrel module respectively. A sealing cavity is formed in the lower die box, a sealing assembly is installed at the bottom of the upper die box and comprises a sealing strip, the sealing strip is matched with the sealing cavity, and a plurality of sharp tooth grooves are formed in the two sides of the inner wall of the sealing cavity. According to the utility model, the lower die box and the upper die box can be used for packaging optical coupler products of DIP packaging and SOP packaging, and when different series of packaging is carried out on the optical coupler products, the die boxes do not need to be replaced, so that the cost and the time are saved, and the sealing performance of the die boxes is enhanced.

The invention discloses a slip and a surface hardening process thereof, and belongs to the technical field of oil-gas exploration, development and drilling engineering equipment. The surface hardening process of the slip comprises the following steps: carrying out thermal refining on a slip base body blank; and after thermal refining is completed, the slip is subjected to ion nitriding treatment. The invention further discloses the slip. According to the surface hardening process of the slip, a brand-new ion nitriding process is adopted for one-time hardening forming, the size precision is enough, the slip can be put into application without finish machining, and therefore the problem that the carburizing treatment surface hardening yield of the cylindrical sharp tooth slip is extremely low is solved; and meanwhile, laser quenching and common ion nitriding tooth tip point ablation are avoided, the occurrence of a soft belt at the tooth tip part is greatly eliminated and weakened, and the hardness and uniformity of the tooth tip are guaranteed.

The utility model belongs to the technical field of beverage preparation, and particularly relates to a beverage preparation emulsification tank which comprises a tank body, an inner container body is arranged on the inner wall of the tank body, a plurality of sharp teeth are arranged on the inner wall of the inner container body in an array mode, and a tank cover is arranged at the top of the tank body. The liquid pumping power source is arranged at the top of the tank cover; the liquid pumping pipe fitting is arranged on the peripheral side wall of the tank body; the rotary liquid spraying pipe fitting is rotatably arranged below the middle part of the tank cover; the driving assembly is arranged at the top of the tank cover and is used for solving the problem that the mixing and emulsifying processing requirements of the beverage cannot be met due to the fact that the beverage in the emulsifying tank is easily dispersed unevenly, precipitated and layered.

A sheet pearl wool cutting working table comprises a rack and a table top plate arranged on the rack, and a material cutting device, a material spreading device, a cutting operation device and a sharp tooth chain dragging device used for dragging pearl wool are arranged on the rack. According to the pearl wool sheet stacking and cutting device, mechanical discharging and cutting of pearl wool coiled materials can be achieved, meanwhile, pearl wool sheets cut according to a certain length are stacked and then conveyed to a cutting station to be cut, and the pearl wool sheet stacks can be kept stable in the cutting process of the cutting station; and it is guaranteed that the size of a cut product is accurate, and the quality of the cut product is improved.

The invention relates to the technical field of medical equipment, in particular to a damping structure and an injection pen, the damping structure comprises a jumping ring, a knob, a force applying piece and a fixing buckle, and a through hole is formed in the rear side face of the knob around the axis of the knob and penetrates through the knob in the front-back direction; the end, relative to the first direction, of the penetrating hole is a first end, the end, relative to the second direction, of the penetrating hole is a second end, the first end is provided with a first abutting part, the front side face of the jumping ring is provided with first abutting teeth around the axis of the jumping ring, the front end of each first abutting tooth is provided with a sharp tooth part and a flat tooth part, and the tooth face, relative to the second direction, of each flat tooth part is provided with a first tooth abutting part. The sharp tooth part is provided with a second tooth abutting part, the rear side face of the fixing buckle is provided with a plurality of second abutting teeth around the axis of the fixing buckle, the knob is rotationally arranged at the rear end of the fixing buckle, the jumping ring is rotationally arranged at the rear end of the knob, the first abutting teeth penetrate through the penetrating hole, and the force applying piece is arranged at the rear end of the jumping ring. In conclusion, the damping structure has the effect of effectively improving the use experience and the operation comfort of a user.

The invention discloses a fishing line assembly with an anti-cutting line safety structure, which comprises a switching component, a first anti-cutting line, a second anti-cutting line and a fishhook body, the switching component connects a fishing main line with the first anti-cutting line and the second anti-cutting line, and the other end of the first anti-cutting line and the other end of the second anti-cutting line are connected with a handle part of the fishhook body; the vertical length of the first anti-cutting line is smaller than that of the second anti-cutting line; the first anti-cutting wire and the second anti-cutting wire are connecting wires with tensile force. According to the fishing hook, when a fished object bites a hook and then gets rid of the fished object, the first anti-cutting line is straightened, so that the anti-cutting strength is reduced, after the fished object is instantly cut off due to impact of sharp teeth, the second anti-cutting line which is not straightened can still guarantee effective connection of the fishing hook body and the switching component, the fished object is prevented from escaping, the fishing rate is effectively increased, use is easy and convenient, and the fishing hook is worthy of popularization and application. And the interestingness of fishing is greatly improved.

The utility model belongs to the technical field of laser cutting, and particularly relates to a laser cutting workbench which comprises a workbench body, a blanking opening is formed in the upper side face of the workbench body in a penetrating mode, rack mechanisms are arranged on the upper side of the blanking opening of the workbench body at equal intervals, side rails are symmetrically arranged on the two sides of the upper side face of the workbench body, and electric sliding tables are arranged on the upper sides of the side rails in a sliding mode. A transverse rail is arranged on the upper sides of the sides, close to each other, of the electric sliding tables, and a laser generator is slidably arranged on the upper side of the transverse rail. When upward sharp teeth of the triangular tooth pieces of the rack mechanism are damaged, only the nut needs to be screwed off, the screw rod is pulled out, the intact sharp teeth of the triangular tooth pieces face upwards, then the screw rod is inserted back again, and the fixing nut is screwed down, the rack mechanism does not need to be wholly replaced, the single triangular tooth piece can be rapidly detached to be replaced, and each triangular tooth piece is provided with three sharp teeth, so that the replacement is convenient. The rack mechanism can be replaced and used three times, replacement and maintenance convenience of the rack mechanism is improved, and the use effect of the rack mechanism is greatly improved.

The soil seed bank sampling device comprises a supporting plate, a lifting device and a connecting handle, bottom plates are fixedly connected to the left end and the right end of the lower surface of the supporting plate, sharp teeth are fixedly connected to the lower surfaces of the bottom plates at equal intervals, and fixing nails are connected to the outer ends of the bottom plates in a penetrating mode; a lifting device is fixedly connected to the middle of the upper surface of the supporting plate, a sampling pipe is in threaded connection to the middle of the supporting plate, connecting lines are arranged on the outer surface of the sampling pipe, a connecting handle is mounted on the top surface of the sampling pipe, a connecting hole is formed in the middle of the connecting handle, and a separation net is fixedly connected to the bottom end in the connecting hole; a stabilizing bolt penetrates through the outer end of the connecting handle, an inflating pump is fixedly connected to the middle of the top end of the connecting handle, and a bottom cover is in threaded connection with the outer end of the bottom of the sampling tube. The soil seed bank sampling device convenient for classified storage is convenient for classified storage of taken soil seeds, is convenient for stabilizing and fixing the sampling pipe, and is convenient for unloading.

The utility model relates to the technical field of cutting tools, in particular to a tapper, the tapper comprises a metal matrix and a diamond coating layer, the metal matrix comprises a cylindrical cover body, a connecting body and a connecting shaft, the cylindrical cover body comprises a shell at the upper end and a cutting part at the lower end, a scrap outlet is formed in the shell, and the connecting body is connected with the cutting part. The cutting part is in a sharp tooth shape, the sharp tooth shape is sharper, the cutting effect can be enhanced, the cutting part comprises a set of high sharp teeth and a set of low sharp teeth, and the high sharp teeth are higher than the low sharp teeth. The tapper has the advantages that the tapper has two efficient cutting periods, and the problem that the cutting capacity of the tapper becomes weaker and weaker is solved.

A medium-pitch large wood conveying chain with a sharp tooth structure formed by two-stage accessories belongs to the technical field of chain transmission, comprises a sharp tooth type wood conveying chain body, and is characterized in that the sharp tooth type wood conveying chain body comprises sharp tooth outer chain plates and sharp tooth inner chain plates. Transverse second-level accessories are welded to the top ends of the oppositely-arranged sharp-tooth outer chain plates, the adjacent second-level accessories form an additionally-arranged sharp-tooth structure, the large wood is clamped between the two second-level accessories through the additionally-arranged sharp-tooth structures, and conveying of the large wood is achieved under the condition that the small pitch is kept. Stable conveying of large wood is guaranteed, the tensile strength and the wear resistance of the chain are considered, the functionality and the service life of the chain are guaranteed, and meanwhile, compared with an existing large wood sharp-tooth wood conveying chain, the pitch is remarkably reduced, the conveying efficiency can be improved, the size of the chain wheel can be reduced, and installation convenience is improved.

Apparatus, consisting of a hinge (84) defining a hinge axis (88), and a pair of opposing jaws (80A, 80B), including a movable jaw and a fixed jaw having a predetermined part radiopaque, so that the fixed jaw location is identifiable from a fluoroscopic image of the fixed jaw. The opposing jaws terminate at proximal and distal regions, and the proximal regions are connected to the hinge so that the movable jaw rotates about the hinge between a closed state and an open state. The jaws are curved in planes parallel to the hinge axis, and terminate in narrowed ends at the distal regions, so that in the closed state the jaws grip sections of vertebrae. The apparatus also has a support structure (60) that retains the hinge and the pair of opposing jaws, and a multiplicity of sharp teeth (98) disposed on respective inner surfaces of the opposing jaws.

The utility model discloses a hard alloy circular saw blade for a trephine, which relates to the technical field of cutting and comprises a trephine body, a plurality of groups of saw teeth arranged circumferentially at equal intervals are arranged on the trephine body, each saw tooth consists of a left helical tooth, a right helical tooth and a sharp tooth, the right helical tooth is positioned between the left helical tooth and the sharp tooth, and the cutting edge angle epsilon of the left helical tooth and the right helical tooth is 5 degrees. The tool cutting edge angle epsilon of the sharp teeth is 15 degrees, the sharp teeth are in left-right inclined symmetrical design, centripetal angles with Tp being 1 degree are designed on the side faces of the left inclined teeth, the right inclined teeth and the sharp teeth, and circumferential angles with Tr being 3 degrees are designed on the side faces of the left inclined teeth, the side faces of the right inclined teeth and the side faces of the sharp teeth. Due to the design of the tool cutting edge angle, the cutting amount can be uniformly distributed during cutting, the cutting efficiency is improved, meanwhile, tipping during cutting is avoided to the greatest extent, and the service life of a product is prolonged; due to the design of the centripetal angle and the circumferential angle, the friction of the tooth side face to the workpiece is reduced, the cutting resistance is remarkably reduced, the temperature of the workpiece is reduced, and it is guaranteed that the cutting face of the workpiece such as wood, aluminum and plastic is smooth and free of focal marks.