2233results about How to "Increase the bearing area" patented technology

The invention discloses a five-axle linkage digital-control processing centre which comprises a lathe bed (10) and a portal frame (30), wherein the portal frame (30) comprises a left portal upright post (32), a right portal upright post (32) and a fixing portal crossbeam (35), and the front part of each portal upright post (32) is provided with a direct driving type double-shaft precise rotating table (20) which enables a working table (26) to simultaneously rotate round an A shaft and a C shaft. Furthermore, the portal frame (30) is provided with a crossbeam (40) which can move along the Y direction, the front part of the crossbeam (40) is provided with a slide carriage (50) which can move along the X direction, the front part of the slide carriage (50) is provided with a main shaft box (60) which can move along the Z direction, the main shaft box (60) is provided with a main shaft installing hole (66) used for installing a main shaft (70), and a tool magazine (80) is arranged in a cavity positioned between the lathe bed (10) and the portal frame (30). The invention has novel structure, small occupied area, space saving, low cost and stable operation and property. Besides, a motion shaft of a machine tool has high dynamic property, regulating property, positioning precision and repeated positioning precision.

A method of treating obstructive sleep apnea includes providing an elongated element having a central buttress area and first and second arms extending from opposite ends of the central buttress area. The method includes implanting the central buttress area in a tongue so that a longitudinal axis of the central buttress area intersects an anterior-posterior axis of the tongue. The first and second arms are advanced through the tongue until the first and second arms engage inframandibular musculature. Tension is applied to the first and second arms for pulling the central buttress area toward the inframandibular musculature for moving a posterior surface of the tongue away from an opposing surface of a pharyngeal wall. The first and second arms are anchored to the inframandibular musculature for maintaining a space between the posterior surface of the tongue and the opposing surface of the pharyngeal wall.

The invention relates to an apparatus for vibration-insulated mounting of an electric motor (20), in particular a blower motor, having a first housing part (10), which encloses at least one pole ring (22) and magnets (24) of the electric motor (20) and has at least one opening (14, 16), through which the shaft (18) of the motor (20) reaches, and having a second housing part (54), which is embodied as a motor flange for securing the electric motor (20) to a carrier element, for instance a motor vehicle heating and / or air conditioning system, and at least partly embraces the first housing part (10) in the axial direction of the motor shaft (18).It is proposed that on the outer circumference (26) of the first housing part (10), a plurality of radially extending, relatively flat plastic spokes (28) are provided, which engage associated, radially and axially extending recesses (57) of the second housing part (54), and which in the region of their radially outer end (32) have connecting means (36) for securing them to the second housing part (54).

The invention discloses a constant volume combustion device for observing the mutual effect of a flame and a pressure wave. A combustion bomb body is provided with an observation hole provided with an optical observation window; the optical observation window comprises optical glass provided with an annular boss on the outer side; the inner side and the outer side of the optical glass are respectively provided with an embedding end cover and a compressing end cover which are mutually connected through a bolt; the embedding end cover and the compressing end cover are arranged on the combustion bomb body through bolts; and high-temperature resistant gaskets are respectively arranged among the embedding end cover, the compressing end cover and the optical glass. According to the constant volume combustion device, the influence of the installation of the optical observation window of the combustion bomb body to the regularity of the inner cavity shape of the optical observation window is reduced, and the inner cavity smoothness is improved, so that the reflection effects of an inner flow field and a wall pressure wave are improved; and meanwhile, the stress manner of glass in the traditional optical observation window is changed, the thickness of the glass is reduced, and the device is beneficial to observation and shooting effects of experiments.

The invention provides a vehicle braking auxiliary device based on aerodynamics. The vehicle braking auxiliary device based on aerodynamics comprises an ECU (electronic control unit), at least two link mechanisms, a fixed shaft, a front spoiler, a rear spoiler, at least two step motors, at least three hydraulic cylinders, a vehicular speed sensor, a turning angle sensor, at least two position sensors and at least three pressure sensors. The vehicular speed sensor, the turning angle sensor, the position sensors and the pressure sensors are all connected with an input end of the ECU, each step motor and each hydraulic cylinder are connected with an output end of the ECU, one end of each link mechanism is correspondingly connected with an output shaft of one of the step motors while the other end of each link mechanism is in transmission connection with the rear side of the front spoiler, the front spoiler is capable of rotating around the fixed shaft which is arranged on the front side of the front spoiler, and a piston rod of each hydraulic cylinder is connected with the rear spoiler. The vehicle braking auxiliary device based on aerodynamics is capable of instantly reducing vehicular speed to some extent and increasing ground adhesion of a vehicle to enable the vehicle to keep stable in high-speed emergency braking, braking distance can be shortened, and safety is improved.

The invention discloses a device for breaking walnut shells and taking walnut kernels, having functions of self-positioning, pre-breaking shells, equidirectional spiral self-grading and flexible extrusion. The device comprises an intermittent feeding device, the a shell pre-breaking device, a flexible shell breaking device and a separating device, which are fixed on a machine frame, wherein the intermittent feeding device is used for performing intermittent batch feeding for the shell pre-breaking device; the shell pre-breaking device comprises an extruding part and a blanking part which are mutually matched; the extruding part is in reciprocating movement, and is matched with the blanking part for extruding walnuts, so that cracks are generated in the walnuts; the blanking part is in reciprocating movement, so that the extruded walnuts fall off to the flexible shell breaking device; the flexible shell breaking device is used for breaking walnut shells; and shells and kernels of the walnuts after shell breaking are separated for storage through the separating device. The device disclosed by the invention integrates a plurality of systems, and is compact in structure, the manufacturing cost of a machine is reduced, the occupied space for the operation of the machine is also reduced, and the miniaturization and the high efficiency of the machine are facilitated; in structure design, multiple connections including splicing, combining and the like for cooperating work can be realized; and the requirements of various production scales and the requirements of various production sites can be met, and the device is also suitable for families, and is widely applied.

The invention provides a construction device and construction method for a stirring and spraying expanded reinforcement pile. The construction device is characterized in that a drill pipe is formed by coaxially overlapping an outer pipe body and an inner pipe body in a sleeving mode and provided with a rotary power mechanism, a lifting device and a variable-diameter telescopic stirring arm; the inner pipe body is provided with a spiral drill bit and a spraying nozzle, and high-pressure ejection, forced stirring, improvement on the drilling speed and adjustment of the specifications of a pile body and an expanded body are realized through the operations of arm folding, arm unfolding, rotating, high-pressure grouting and the like. The construction method is characterized in that the setting parameters and design scheme of the pile body and the expanded body of the reinforcement pile are designed in advance. The method includes the particular construction steps that (1) pile positions are aligned; (2) the expanded body and the pile body of the reinforcement pile are constructed in a mode A (from top to bottom) or mode B (from bottom to top) according to the advanced design; (3) the stirring and spraying expanded reinforcement pile which accords with the advanced design and is provided with the expanded body is formed; and (4) subsequent construction is carried out through multiple methods and includes manufacturing of a reinforcement body pile body and pile end carriers and laying of a cushion layer.

The invention discloses a fruit picking manipulator which comprises a hand portion and a tri-link spherical coordinate type arm. The hand portion comprises a supporting plate arranged on a wrist, fingers and connecting rods thereof are respectively hinged to two sides of the front end face of the supporting plate, and a draw rod for drawing the fingers to open and close is directionally and movably assembled on the supporting plate through a draw rod driving mechanism arranged on the supporting plate. The fruit picking manipulator is characterized in that the inner sides of the front ends of the fingers are provided with arc clamping plates with opposite arc directions respectively. When fruits are picked by the fingers, the arc shape of the arc clamping plates arranged in the front of the fruit picking manipulator fits shapes of fruits, so that the peripheral stressed areas of the fruits are large, the fruits are uniformly stressed, and the problem of fruit damage caused by high local stress on the fruits in the prior art can be avoided.

The invention relates to an industrial aquaculture fish shelter. The industrial aquaculture fish shelter is characterized in that a first fish shelter body is composed of a cover plate and a base, a gas-filling device is arranged on the cover plate, and the gas-filling device which is located in a cavity is connected with a gas bag device; the base is provided with a plurality of through holes, and a plurality of concave pits are formed in the outer surface of the cover plate; an arc-shaped panel body of a second fish shelter body is arranged on the outer side of a star-like structure and partially covers the star-like structure, and the arc-shaped panel body and the star-like structure define one or more containing bodies with the two ends opened; an anchor body of a positioning anchor is provided with a plurality of containing cavities, barbs are arranged in the containing cavities, and the barbs are in rotation connection with a convex block on the anchor body through pin shafts. According to the industrial aquaculture fish shelter, the first fish shelter body can be matched with the positioning anchor to control the suspension height of the fish shelter by inflating and deflating the gas bag, and the second fish shelter body is of a porous structure and has the advantages of being large in concealed space, high in concealing property, good in water body circulation and the like; the positioning anchor is matched with the first fish shelter body and can regulate the suspension depth to conduct artificial enhancement, and the enhancement effect is good.

The invention relates to a joint grouting method from bottom and side of a prestressed pipe pile. The pipe pile in the soil is subjected to pressure joint grouting on the bottom and side (hole wall) of the pile through a ground grouting device by pre-burying pipelines at the bottom and side of the prestressed pipe pile. Post-grouting quality control adopts a dual-control method of grouting amount and grouting pressure; and cement injection quantity control is used as a primary part, and pumping end pressure is used as an auxiliary part. On one hand, a convex slurry pack stone body formed by grouting plays a protection role on a joint of the pipe pile and the use durability of the pipe pile is improved. In addition, the mechanical performance of a soil body and a boundary condition between the pile soils are changed by grouting, and the strength and the stability of rock-soil around the pile are further improved, so as to improve the bearing capacity of a pile foundation and reduce the settling volume. Therefore, the pile arrangement quantity and the size of a cushion cap can be reduced, the construction period can be shortened, and the construction costs can be reduced.

The invention relates to the technical field of motor machining, and discloses an adjustable positioning milling fixture with uniform clamping force. The milling fixture comprises a mounting table, the top of the mounting table is fixedly connected with a connecting block, four evenly distributed sliding holes are formed in the side wall of the connecting block, the four sliding holes communicate,sliding rods are in sliding connection to the inner walls of the four sliding holes, the ends, located in the connecting block, of the four sliding rods are fixedly connected with limiting blocks, limiting grooves are formed in the inner walls of the four sliding holes, the four limiting blocks are in sliding connection with the inner walls of the four limiting grooves, the ends, outside the connecting block, of the four sliding rods are fixedly connected with a first arc clamping plate, and a transmission box is fixedly connected to the bottom of the mounting table. According to the adjustable positioning milling fixture with uniform clamping force, a motor shell is sleeved with the position between a first clamping plate and a second clamping plate, the side wall stress area of the motor shell is increased, clamping force is transmitted by two opposite directions, and when the motor shell is clamped, the shell is not prone to deforming.

The invention discloses a directional automatic folding device for corrugated carton gluing machines. The device comprises a paper pressing assembly and a moving connection assembly, wherein the paper pressing assembly comprises a folding substrate, a folding support arm, a sliding shaft and a paper pressing plate which are sequentially connected; the moving connection assembly comprises a connecting bar, a slide block and an eccentric cam which are sequentially connected; and the folding substrate is arranged at the upper end of an external side guide seat of a corrugated carton gluing machine, and the eccentric cam is arranged on the outside of the external side guide seat of the corrugated carton gluing machine. The directional automatic folding device disclosed by the invention replaces the traditional belt continuous rolling and folding, the stressed area of a folded carton is large and equalized in exerted force; the folded carton moves along a preset direction, thus being precisely positioned, and no scissors gap and 'fishtail' phenomenon is generated; and a corrugated carton can have a precise geometric size, thereby meeting the need for large-scale and automatic production of the packaging industry.

The invention discloses a telegraph pole and an installing and fixing method thereof. The lower end of the telegraph pole is provided with through holes which cross through the telegraph pole body; the installing and fixing method comprises the following steps: a pre-buried pit is dug at the installing position of the telegraph pole, a steel bar is penetrated into the through holes at the lower end of the telegraph pole, the two ends of the steel bar are arranged outside the telegraph pole which is upright in the pre-buried pit, and a pouring frame with the shape being adapted to that of the pre-buried pit is constructed outside the two ends of the steel bar; and pouring is carried out in the pouring frame by using concrete, thus forming a base seat which is integrated with the telegraph pole. At least two pairs of through holes at the lower end of the telegraph pole are distributed uniformly and alternately; the cross section of the pre-buried pit is a regular quadrangle; the pouring frame is in the shape of a regular quadrangle frustum with small top and big bottom, and the pouring frame consists of hollow-out net boards. As the cast-in-situ base seat which forms into one firm body with the telegraph pole is added, and the surface is unsmooth, the force bearing area of the telegraph pole is increased, the gravity center is reduced, the anti-inclination and anti-toppling capacity of the telegraph pole is increased, and the telegraph pole is safe and reliable.

The invention discloses a novel torpedo anchor with an expandable anchor head. The novel torpedo anchor mainly comprises the anchor head composed of four conical plates, a guide rod, an anchor body, an anchor tail cover plate, a mooring ring and the like, wherein the four conical plates in the anchor head are hinged with the lower edge of the anchor body; the lower ends of the conical plates are connected with a steel cable; the steel cable is guided to the other end through a pulley on the anchor body and is tied to the mooring ring; and when the anchor body penetrates to a specified depth, the conical plates can be expanded by pre-tensioning the guide rod. By expanding the conical plates of the anchor head of the torpedo anchor, the stressed area of the anchor body is increased, therebyenhancing the bearing capacity of the anchor body; a tensioning device is relatively simple and easy to manufacture; and installing and tensioning processes are relatively simple and easy to operate.

The invention relates to the technical field of medical equipment, in particular to a disposable foreskin cutting stapler. The disposable foreskin cutting stapler comprises a concave seat, a staple chamber sleeve, a casing, a lead screw, a staple pushing piece, a movable handle and a connecting rod, wherein the lead screw is arranged in the casing, the staple chamber sleeve is arranged on the left side of the casing, the staple pushing piece and the concave seat are arranged in the staple chamber sleeve, the movable handle is installed on the casing, the connecting rod is connected with the casing and the movable handle, a safety clip is arranged on the casing, an adjusting nut is arranged at the tail end of the casing, an adjusting bolt is arranged at the end of the lead screw, exhaust through holes are formed in the concave seat, and a suture carrying hole is formed in the staple chamber sleeve. The disposable foreskin cutting stapler has the advantages that the operation time is effectively shortened during use, the stapler is convenient for a doctor to operate, the stapler is not only safe but also practical, the stress area is increased through the fish-tail-shaped adjusting nut, the stress points are increased, the appearance is attractive and the operating hand feeling is improved.

The invention discloses a prone-operative-position mattress. The prone-operative-position mattress comprises a prone-position mattress body, a head cushion, a trunk cushion and lower-limb cushions. The head cushion is arranged on the prone-position mattress body, the prone-position mattress body and the lower-limb cushions are connected with the trunk cushion, lower-limb grooves are formed at joints of the trunk cushion and the lower-limb cushions respectively, and the whole prone-operative-position mattress is of a vertical centrosymmetric structure. By the prone-operative-position mattress, patients can keep their operative positions unchanged for a long time during operations, and standard arrangement of the operative positions of the patients during prone-position operations is realized; the standard arrangement is reasonably designed on the condition that features of the prone-position operations, genders, heights and weights of the patients and different pressure bearing capabilities of limbs are fully taken into consideration, so that the limbs of the patients are reasonably supported to disperse the pressure borne by the trunks and the limbs of the patients so as to protect the patients; workload and working difficulty of medical workers are lowered; operation time of the patients is indirectly shortened, complications during and after the operations are reduced, hospital stays are shortened, and hospitalization costs are reduced.

The invention belongs to the technical field of air compressors, relates to an oil-free compressor used in a locomotive, in particular to an eccentric block-connecting rod reciprocating piston total oil-free lubricated compressor. The oil-free compressor comprises a motor, cylinders, a piston connecting rod assembly, an air valve assembly, cooling fan and the like, wherein, two cylinders are symmetrically arranged above and below a motor shaft, and can also be arranged at the left and the right of the motor shaft, and the two cylinders are coaxial. Connecting rods are sheathed on the motor shaft by a radial ball bearing and an eccentric block, small top end of each connecting rod is provided with two needle roller bearings with an one-side sealed structure, and a crank-connecting rod mechanism drives a piston to realize reciprocating motion in the cylinders. An air inlet valve, a valve plate and an air outlet valve are arranged between the cylinders and cylinder caps, and the valve plate is of a flat-sheet structure, and is provided with an inlet flow channel and an outlet flow channel. The cylinder caps are provided with air inlet chambers and air outlet chambers. The oil-free compressor has the advantages of oil saving, environmental protection, and simple operation and maintenance.

The invention relates to the technical field of aluminum alloy, and discloses an aluminum alloy processing table for tubular outer wall clamping and inner wall supporting. The aluminum alloy processing table comprises a base, a whole device is supported and stabilized by using the base, through matching use of a second gear, a connecting rod and a brake rod, the inner wall of aluminum alloy is supported in the processing process of the aluminum alloy, the stress-bearing area is increased, the deformation of the inner wall in the process of clamping and fixing is prevented, and the loss in theprocessing process of the aluminum alloy; through the matching use of a pushing rod, a special-shaped rod, a disc and a clamping plate, a pipeline is clamped in the processing process of the aluminumalloy, shaking is avoided during processing, the stability of processing is ensured, and thus the processing efficiency is improved; and through the matching use of a first rotating disc, a second rotating disc, a rotating rod, a sector gear and a sliding block, the steps of outer wall clamping and inner wall supporting are linked, thus the linkage of the whole device is improved, and operation issimpler.

The present invention discloses construction process and special appliances for forming filling pile with reamed end. The construction process includes the following steps: boring to set depth with conventional pile work borer; reaming with reaming bit to form cylinder or frustum in the pile bottom; setting the reinforcing cage gravitationally or by means of external force; and pouring concrete to form the filling pile. The special appliances include one reaming bit capable of forming oversized pouring end, and one reinforcing cage capable of being drawn in and drawn off. The filling pile with reamed end has great stressed area in the pile bottom, great bearing capacity and high anti-seismic capacity.

The invention relates to a method for adjusting the axis deviation of an industrial factory building edge foundation heavy column, which comprises the following steps of: (1) hoisting a heavy column into an edge foundation; (2) measuring the verticality and the axis deviation of the heavy column by using a theodolite; and (3) adjusting the axis deviation of the heavy column. The axis deviation adjustment of the heavy column comprises the following steps of: firstly, vertically and fixedly installing vertical steel plates on both ends of the heterotopic surfaces of a horizontal rectangular steel plate respectively for forming a base; reclining the vertical steel plate at one end of the base and the horizontal steel plate to the inner wall and the top surface of the convex part of the edge foundation; reclining a jack base on the vertical steel plate at the other end of the base and attaching the end part of a push rod of a jack to the outer wall of the heavy column; controlling the jack to finish the axis deviation adjustment of the heavy column; and fixing by using a steel wedge with corresponding size. The adjusting method has the advantages of simple and easy operation, high operating safety, attractive edge foundation appearance, higher precision, effective improvement on the construction quality, shortening of the construction time and improvement on the construction efficiency.

The invention discloses an elevated-road rainwater recovery system and a construction method thereof. The elevated-road rainwater recovery system comprises short drainage pipes, drainage pipes, suspension pipes, stand pipes and rainwater recovery boxes; the short drainage pipes are located in retaining walls which are vertically connected on two top sides of an elevated bridge, top ends of the drainage pipes are fixedly connected with the short drainage pipes through pipe joint parts, the two neighboring suspension pipes are connected through a horizontal pipe, the rainwater recovery boxes are connected with rotary nozzles through water pipes which are connected to bottoms of the rainwater recover boxes, and a water suction pump is arranged on each water pipe. The construction method includes: arrangement of the short drainage pipes, construction of pipe connection, construction of rainwater recovery boxes, construction of rotary nozzles and trial operation of the rainwater recovery system. Rainwater accumulation on the elevated road is reduced, occurrence of rear-end collision due to slipping of wheels of vehicles is decreased, construction can be performed directly on existing elevated roads, rainwater on the elevated road can be effectively recycled, water resources are saved, and meanwhile, security of the elevated road is improved.

The invention relates to a dental implant abutment, in particular relates to an abutment internally connected with an implant, and belongs to the fields of oral implant and repair. The connecting abutment consists of a crown connecting section, a middle trans-gingival section and an implant insertion section sequentially from top to bottom. The upper crown connecting section of the connecting abutment is a downward enlarged cone of which the taper is 6 degrees. A vertical cutting groove is formed in each of two lateral surfaces of the upper crown connecting section of the abutment, and the two cutting grooves are symmetrically distributed on the two lateral surfaces. The abutment can be used for positioning a crown, and plays a role in resisting rotation. A conical transition section is arranged between the abutment and a connector, and a silver-carrying TiO2 antibacterial coating is coated on the surface. After the abutment is inserted into the inner cavity of the implant, seal fit of conical surfaces, anti-rotating directional fit of eight-angular prism surfaces and pilot fit of cylindrical surfaces can be realized. The invention aims to provide the abutment internally connected with the implant, and the abutment is matched with the implant precisely and stably and has excellent anti-rotating performance.

The invention discloses a fully mechanized coal mining method combining a steeply inclined long-wall drilling type coal mining machine with hydraulic shield type supports, and the mining technology comprises the following steps: the space of a mining field are reliably supported by the hydraulic shield type supports; a working face scraper conveyor and the drilling type coal mining machine are mounted, wherein the drilling type coal mining machine rides on the scraper conveyor and the scraper conveyor is a traveling track of the drilling type coal mining machine; the drilling type coal mining machine cuts coal by virtue of a spiral drilling bit, the cutting range is adjusted by rotating a rocker arm of the drilling type coal mining machine and controlling the drilling type coal mining machine to move left and right through oil cylinders on two sides of the scraper conveyor, a coal bed is cut into a slope and the scraper conveyor is used to convey the coal which is cut down to the outside; the scraper conveyor and the drilling type coal mining machine move downwards along the cut slope of the coal bed to determining a new mining target at the deep part of the steeply inclined coal bed; and the hydraulic shield type supports are adjusted in sequence, the hydraulic shield type supports are moved downwards for support a new mining space. The fully mechanized coal mining method is applicable to mechanized mining of the steeply inclined coal bed with the thickness of 2.0-8.0m.

The invention discloses a roof photovoltaic power generation system. The system comprises a solar photovoltaic module, an edge card, a middle card, an adjusting block, an adjusting rod and a footing, wherein the adjusting rod is provided with an upper external thread and a lower external thread between which a polish rod part is connected and which have opposite turning directions; the top of the adjusting rod is provided with a turning structure, the bottom of the adjusting rod is provided with a second connecting section with an external thread, and the diameter of the second connecting section is smaller than that of the adjusting rod; the footing is arranged under the adjusting block and is connected with the adjusting block through the adjusting rod; the upper thread of the adjusting rod is connected with an adjusting screw hole of the adjusting block in a matching mode, and the lower thread of the adjusting rod is connected with a second adjusting screw hole of the footing in the matching mode; and the second connecting section of the adjusting rod is provided with a nut which is clamped in a through hole below the second adjusting screw hole of the footing. By the roof photovoltaic power generation system, the photovoltaic module can be adjusted up and down, the installation surface of the photovoltaic module has a consistent height, and the normal generating efficiency of the photovoltaic module is ensured.

The invention relates to a unfolding type cable-rod-film combined emergency bridge, which consists of a plurality of bridge units; each bridge unit consists of a cable-rod-film composite beam, a bridge faceplate and supports; the cable-rod-film composite beam is mounted in the groove of the supports; and the bridge faceplate is mounted on the cable-rod-film composite beam; the cable-rod-film composite beam consists of a top boom, a bottom boom, a low pressure inflated air bag and a stay cable; the top and the bottom boom are disposed on the upper and lower side of the beam; the low pressure inflated air bag is disposed in the middle of the beam; the stay cables are disposed on both sides of the beam; the bag is disposed on the bottom boom; the top boom is disposed on the bag; cross section of the top and the bottom boom and the low pressure inflated air bag is superposed with the vertical symmetrical axis; the cables are winded individually along both sides of the rod and passed through the node ring disposed on the rod side, and fixed by tightening the cables on both sides to connect the cable, the rod and the low pressure inflated air bag into one integral body. The novel emergency bridge achieves the advantages of extremely light weight, convenience for storing and carrying and rapid installation, and has high practical value and broad application prospect.

The invention discloses a pair of operating forceps with a negative pressure suction function. The pair of operating forceps comprises forcep handles, forcep levers and a forcep head, wherein the forcep handles are connected with the forcep head through the forcep levers; the forcep head comprises a main claw and an auxiliary claw hinged to the main claw; the forcep handles comprise a fixed handle and a movable handle hinged to the fixed handle; a connector connected with a negative pressure system is arranged on the fixed handle, a handle negative pressure channel communicated with the connector is arranged in the fixed handle in a hidden manner, a lever negative pressure channel communicated with the handle negative pressure channel is arranged in one forcep lever, and a head negative pressure channel communicated with the lever negative pressure channel is arranged in the main claw in a hidden manner; a negative pressure hole communicated with the head negative pressure channel is further formed in the main claw; the fixed handle, the corresponding forcep lever and the main claw are sequentially fixedly connected; the movable handle is connected with the auxiliary claw through a pull rod penetrating through an inner cavity of one forcep lever, and the movable handle pulls the pull rod to control the auxiliary claw and the main claw to be closed and opened. According to the technical scheme, tissue can be clamped under the joint action of mechanical clamping and negative pressure clamping, and the pair of operating forceps has the advantages of controllability of clamping force, little damage to tissue, adaptability to various soft tissue organs, safe and precise operation and the like.

The invention provides a low driving force self-cleaning and heat transfer enhancement rotor in a heat exchange tube, which is particularly suitable for the heat transfer enhancement of a viscous fluid of the tube side. The rotor comprises a hollow cylinder and blades, wherein each blade is of a spiral structure; the root part of the outer surface of the blade is tangential with the edge of the hollow cylinder; and when a fluid axially enters from the heat exchange pipe, the acting force of the fluid vertical to the radial direction of the blade enables the rotor to rotate around a rotary shaft. According to the invention, as the root part of the blade is tangential with the edge of the hollow cylinder, the acting area of the fluid on the blade is increased. The larger the radius of the hollow cylinder is, the more obvious the effect becomes. Consequently, if the rotation driving force applied to the rotor is increased, the rotor is more favorable for the heat transfer enhancement in the case of relatively large viscosity of a medium in the heat exchange pipe or low kinetic energy of the fluid. As the outer surface of the root part of the rotor is tangential with the edge of the hollow cylinder to form a smooth curve, the outer surface of the blade does not scale easily, thereby prolonging the using period of the entire device and reducing the cleaning frequency.

The invention discloses a method and a device for dynamically monitoring microtopography and landforms near seabed. The device for dynamically monitoring microtopography and landforms near seabed comprises a four-side frame, a connecting part, an instrument compartment and a dynamic microtopography and landforms monitoring instrument unit. The method for dynamically monitoring microtopography and landforms near seabed includes the steps of device connection, instrument debugging, device arrangement, device operation and recovery, etc. The device can be used for detecting tidal change, sequential variation of water depths at fixed point, three-dimensional seabed landform change and seabed micro-landform change in real time, thereby achieving the purpose of monitoring the change of seabed micro-landforms. The device and the method are suitable for dynamically observing landforms of seabed with various bed forms and bottom substrates, and are safe and stable. The device is convenient to install and disassemble and can be integrated with multiple marine observation instruments. The method and the device can be widely applied to detection of landforms near seabed, marine charting, marine monitoring, ocean engineering and marine scientific research.

A blind rivet assembly includes a mandrel having a male threaded portion at its distal end to be screwed into an internal female threaded portion of a rivet body. The mandrel has a section of enlarged diameter adjacent the male threaded portion joined by a breaker groove to a pulling portion. The section of enlarged diameter is accommodated within an internal bore of the collapsing portion of the rivet body, the collapsing portion having a radial groove on the outer surface thereof for improving the radial expansion of the rivet when installed. A shoulder in the internal bore supports a sealing ring. When assembled correctly, the pulling portion breaks off at the breaker groove.