46 results about "Sharp tooth" patented technology

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 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.

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 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.

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.

The seasoning crushing and stirring device comprises a stirring wok, an opening of the stirring wok is fixedly connected with an annular rail base, and a stirring and crushing mechanism is arranged on the annular rail base in a rolling mode; the stirring and crushing mechanism comprises a rotating frame, and rolling wheels rolling on the annular track base are mounted at the end of the rotating frame; a plurality of smashing assemblies are installed on the rotating frame, each smashing assembly comprises a zigzag frame, the lower end of each zigzag frame is fixedly connected with a material smashing structure, each material smashing structure comprises a plurality of sharp tooth plates fixedly connected to the corresponding zigzag frame, and a plurality of smashing sharp teeth are integrally formed on each sharp tooth plate; the mechanism further comprises a plurality of steel stirring plates assembled at the inner end of the rotating frame respectively, the angle of the steel stirring plates is adjusted through an angle adjusting structure, and after the angle of the steel stirring plates is adjusted, the stirring position is adjusted. And the stirring and crushing mechanism further comprises a motor for driving the rotating frame to rotate. In this way, stir-frying and material crushing are synchronously carried out, and the defect that seasoning processing is difficult is overcome.

The utility model discloses a dilator for the orthopedics department. Comprise a left clamp body and a right clamp body, a protruding rectangular groove is formed in the middle of the right clamp body, the left clamp body is a groove rectangular block, and the protruding rectangular block is embedded into the groove and connected with the groove through a rotating shaft; a right spring piece is fixed on the inner side of the tail end of the right clamp, a rectangular opening is formed in the front end of the right spring piece, a left spring piece is fixed on the inner side of the tail end of the left clamp, and a rectangular strip is arranged at the front end of the left spring piece and inserted into the rectangular opening in the front end of the right spring piece; two lugs are arranged on the inner side of the tail end of the left clamp, and a rack is fixed between the two lugs through a pin shaft. The front ends of the left clamp and the right clamp are both in a conical strip shape, a rectangular groove is formed in the inner side face of the front end of the left clamp, when the spreader is closed, the front end of the right clamp enters the rectangular groove of the left clamp, and after the spreader is closed, the overall width of the front end is the width of the front end of the left clamp. The rear end of the left spring piece is inserted in the lower side of a rack fixed at the tail end of the left clamp, so that the rack is perpendicular to the center line of the spreader. The tail end of the right clamp is in a sharp tooth shape, and tooth tips are kept to be inserted into tooth grooves in the rack.

The invention provides an automatic crushing device for rare earth oxide production, and relates to the technical field of rare earth oxide production, the automatic crushing device comprises a crushing cylinder, the lower side of the crushing cylinder is provided with a filter plate, the inner side of the crushing cylinder is rotatably connected with a square pipe through a driving mechanism, and a plurality of crushing rods with sharp teeth are rotatably inserted in the two sides of the square pipe; the device further comprises a linkage mechanism for driving the multiple crushing rods to rotate. The square pipe is driven by the driving mechanism to rotate, the square pipe drives the two crushing mechanisms to rotate, meanwhile, through the clutch mechanism, when large materials exist at any position on the hollow shovel plate, the cam and the main shaft can be combined through the clutch mechanism, meanwhile, the main shaft is driven to rotate through the meshing effect of a small gear and a large gear in the crushing mechanisms, and the crushing efficiency is improved. The main shaft drives the cam to rotate, the cam drives the rotating arm to swing forwards and backwards, the rotating arm can knock the firing pin, the firing pin transmits impact force to large materials, and the large materials can be quickly crushed.

The utility model discloses a powdery bagged lime bag-breaking feeding machine, which relates to the technical field of agricultural mechanical equipment, and comprises a rack, the rack is of a frame structure, the top of the rack is provided with a conveying bag-breaking device, one side of the conveying bag-breaking device is provided with a material receiving box body, a clamping blanking device is arranged in the material receiving box body, and the clamping blanking device comprises a lower pressing strip. The lower pressing strip is fixedly connected to the top in the receiving box body, sharp tooth chains are arranged on the two sides of the lower pressing strip, a discharging structure is arranged at the bottom of the receiving box body, and the inner diameter of the discharging structure is gradually reduced from top to bottom; an auger conveying device is arranged at an opening in the bottom of the discharging structure and is used for conveying lime powder to one side of the rack; the conveying bag breaking device, the sharp tooth chain and the auger conveying device are all driven by the power transmission device. Through the arrangement of the lime spreading machine, the problem of difficulty in feeding in the lime spreading process is solved, and the lime spreading machine has important significance in realizing mechanized operation in the whole lime spreading process and ensuring sustainable development of agriculture.

The liftable double-layer garbage can comprises an outer barrel, an inner barrel, an outer rod, an inner rod, an elastic mechanism and a plurality of limiting blocks. The outer cylinder is provided with an accommodating groove; the inner cylinder is arranged in the containing groove in a lifting mode. The outer rod is provided with a lifting groove; the top side of the inner wall of the lifting groove is provided with a plurality of fixing blocks and a plurality of sharp teeth which are evenly distributed in the circumferential direction at intervals up and down. Each fixing block comprises a guide inclined edge and a limiting edge, and the guide inclined edge and the limiting edge jointly define a fixing groove; the inner rod is rotationally arranged on the inner cylinder, and one end of the inner rod extends into the lifting groove; the elastic mechanism drives the inner rod to ascend; the multiple limiting blocks are evenly distributed on the top side of the inner rod in the circumferential direction, and each limiting block comprises an upper vertex angle part, a lower vertex angle part, an upper inclined edge and a lower inclined edge. According to the invention, two states of high and low are realized, so that not only can the sitting posture state of a human body be adapted, but also the standing state of the human body can be adapted, the application range of the product is expanded, and the comfort of a user in use in various scenes is ensured.

The invention relates to the technical field of casing running, in particular to a full-bore floating casing running device which comprises an upper shell, a lower shell and a crushing assembly, and the crushing assembly comprises a crushing disc arranged on the lower portion of an annular boss in the upper shell and used for separating drilling fluid from slurry and a bearing ring arranged on the lower portion of the crushing disc and used for bearing the crushing disc. The annular convex block is arranged between the bearing ring and the inner wall of the upper shell and is used for supporting sharp teeth for crushing the crushing disc, and the shear pin is arranged on the annular convex block and is used for temporarily supporting the bearing ring; the pressure sensing assembly comprises a first pressure sensor, and the first pressure sensor is arranged on the inner wall of the upper shell and used for collecting a first pressure value of drilling fluid on a space formed by the crushing disc and the upper shell. And the situation that the drilling operation efficiency is seriously affected due to inaccurate crushing time of the crushing disc caused by high pressure in the well bottom is prevented.

The utility model relates to the technical field of large-scale precision sheet metal structural member manufacturing, and discloses a secondary convenient positioning device for marking the front and back surfaces of a workpiece, which comprises a laser cutting machine sharp tooth table, and the left and right sides of the inside of the laser cutting machine sharp tooth table are fixedly connected with magnetic seats. A laser cutting head is arranged on the right side of the top of the laser cutting machine sharp tooth table, a plurality of tooth blocks are fixedly connected to the top wall of the laser cutting machine sharp tooth table, a magnetic switch button is fixedly installed on the top wall of the magnetic base, and a preset positioning baffle is arranged on the rear side of the magnetic base. A fastening screw penetrates through the front side of the inner wall of the preset positioning baffle in a threaded mode. According to the utility model, through the rotation of the magnetic switch button, under the action of magnetic force, the fixing effect of the magnetic base on a workpiece is very firm and reliable, and the stability is high, so that raw materials can be saved to the greatest extent, particularly a large number of steel plate materials are saved, and the production cost is reduced.