72 results about "Slip line" patented technology

The utility model relates to the technical field of foot pad processing, in particular to a cutting device for automobile foot pad production, which comprises support frames, an extension rod is fixedly connected between the support frames, the extension rod and the support frames are fixedly connected with a platform, the tops of the support frames are fixedly connected with a frame, and the inside of the frame is rotatably connected with a conveyor belt. The surface of the conveying belt is provided with anti-skid lines, stand columns are symmetrically and fixedly connected to the top of the frame, sliding grooves are formed in the inner walls of the stand columns, arc-shaped grooves are formed in the outer portions of the sliding grooves, driving rods are rotationally connected between the two stand columns, and the ends, away from each other, of the driving rods are rotationally connected with guide columns. Compared with an existing cutting device for automobile foot pad production, through the design of the pressing plate and the sliding plate, positioning can be rapidly completed when a foot pad is cut, meanwhile, the falling time of a cutter is changed, and the overall practicability is greatly improved.

The invention discloses a supporting type foundation pit stability safety coefficient calculation method, and belongs to the technical field of foundation pit stability calculation. The supporting type foundation pit stability safety coefficient calculation method comprises the steps that stratum information, supporting structure information and foundation pit information are input; determining a slip line circle center search range and a search depth under the pit bottom; drawing a slip line; calculating the anti-sliding torque Mri of the soil body, the sliding torque Msi on a sliding line, the anti-sliding torque M'ri and the sliding torque M'si on the sliding arc slope of the ith soil strip, the anti-sliding torque M 'ri and the sliding torque M' si on the sliding arc slope of the ith soil strip under the action of additional stress, and the anti-sliding torque Mf generated by side friction; calculating a safety coefficient K; and outputting the minimum safety coefficient Kmin and the slip line. By means of the supporting type foundation pit stability safety coefficient calculation method, the calculation efficiency is remarkably improved; various factors influencing the foundation pit stability safety coefficient calculation are covered in the calculation process, and the objectivity and accuracy of the calculation result are improved.

The invention relates to the technical field of solid rocket engine combustion chamber composite material shells, and provides a large-aperture-ratio fiber winding composite material shell structure which comprises a front sealing head, a barrel section, a front skirt and a rear skirt assembly. The front sealing head is connected with one end of the cylinder section, the front skirt sleeve is arranged on the front sealing head and extends to the outside of one end of the cylinder section, and the other end of the cylinder section is connected with the rear skirt assembly. A traditional end socket is omitted, stable winding forming of the large-aperture-ratio composite material winding shell is achieved, and the requirement that the composite material shell bears the high internal pressure load effect is met. According to the structure, a traditional composite shell forming wire hanging tool and a combustion chamber shell skirt structure are combined, the structure and the function are integrated, the problem of fiber wire sliding during winding of a large-aperture-ratio structure is solved, the manufacturability of winding forming of the large-aperture-ratio composite shell is greatly improved, and the internal pressure bearing capacity of the large-opening composite shell is improved.

The utility model aims to disclose a grabbing and carrying device for stacked material trays, which relates to the technical field of stacked material tray packaging and comprises a horizontal module and a lifting component horizontally moving along the horizontal module. The lifting assembly comprises a lead screw, a lifting support, a connecting block and a clamping jaw. The lead screw and the connecting block are arranged in a matched mode. The lead screw drives the lifting support to ascend and descend along the connecting block, and the clamping jaw is arranged at the bottom of the lifting support. The clamping jaw comprises a clamping air cylinder, a first L-shaped clamping plate and a second L-shaped clamping plate, wherein the first L-shaped clamping plate and the second L-shaped clamping plate are driven by the clamping air cylinder. A plurality of anti-skid lines are arranged on the inner side of the first L-shaped clamping plate, and a plurality of anti-skid lines are arranged on the inner side of the second L-shaped clamping plate. The technical effects are as follows: a plurality of stacked material trays filled with materials are grabbed as a whole, and the stacked material trays are placed in a packaging bag at one time through lifting and horizontal movement; the device has the advantages of high efficiency and labor saving.

The utility model provides a bicycle rim capable of preventing a brake pad from being abraded, which belongs to the technical field of bicycles and comprises a rim body, patterns are arranged on the outer side of the rim body, transverse anti-skidding patterns are arranged on the outer side of the rim body, and vertical anti-skidding patterns are arranged on the side faces of the transverse anti-skidding patterns. By means of the arrangement of the transverse anti-skid lines and the vertical anti-skid lines, the brake pad is rubbed on different lines, the brake pad is prevented from becoming smooth, the service life of the brake pad is prolonged, spokes on the rim can be cleaned through the brush by means of the cleaning assembly, the rim is more convenient to use and popularize and use, and the service life of the brake pad is prolonged. By arranging the warning mechanism and installing the fixing bolts in the threaded holes, the lower mounting base and the upper mounting base are fixed to the outer sides of the spokes, vehicles and pedestrians can be warned at night through the LED lamp beads and the reflective film on the warning plate, and the functionality of the rim is improved.

The utility model provides a power-assisted automobile pedal structure, which relates to the technical field of automobile pedals and comprises a support frame, a swing frame is rotatably mounted between two sides of the inner wall of the support frame, a pedal is fixedly mounted on one side of the swing frame, and a limiting frame is fixedly mounted on one side of the pedal. A plurality of anti-skid lines are integrally arranged on one side of the pedal, and a cleaning assembly used for cleaning dust and sewage between the anti-skid lines is arranged in the limiting frame. A worker controls the moving plate to move, so that the bristles on the lower surface of the moving plate and the inner walls of the through grooves can clean dust and sludge on the surfaces of the anti-skid lines and between the adjacent anti-skid lines, and the dust and the sludge are prevented from being attached to the surfaces of the anti-skid lines and gaps between the adjacent anti-skid lines; the friction force on the surface of the pedal is prevented from being reduced due to sludge and dust accumulation, so that the anti-skid effect is prevented from being influenced, and the risk of foot sliding when a driver operates a vehicle is greatly reduced.

This invention relates to the field of semiconductor material testing technology, specifically a single-crystal silicon wafer slip line detection system and method, comprising: a light source module emitting light signals of different wavelengths and polarization angles to scan the silicon wafer; a silicon wafer scanning module mounting the silicon wafer under test, adjusting the position of the silicon wafer under test, and executing a scanning trajectory to scan the silicon wafer with light signals; a signal acquisition and processing module receiving the light signals transmitted through the silicon wafer under test, performing preprocessing to obtain DU values ​​at different wavelengths and polarization angles, and sending them to an industrial control computer; the industrial control computer reconstructing the strain field based on the DU values ​​using a strain field reconstruction algorithm to generate a strain field distribution map; and identifying slip lines based on the strain field distribution map using a convolutional neural network model. This solution enables non-contact, non-destructive, and high-resolution slip line detection, thereby improving detection accuracy and efficiency.

The utility model discloses a screw tightness online real-time monitoring device, and relates to the technical field of bolt looseness monitoring. The device comprises a sensor assembly, a permanent magnet assembly and a supporting plate, the permanent magnet assembly comprises a threaded shaft sleeve with one closed end, and an elastic piece and an anti-skid base plate are arranged in the threaded shaft sleeve; a plurality of limiting grooves are formed in the inner wall of the threaded shaft sleeve, and the anti-skid base plate is connected with clamping blocks matched with the limiting grooves one to one. The elastic piece is located between the anti-skid base plate and the inner top wall of the threaded shaft sleeve, anti-skid lines are evenly distributed on the lower surface of the anti-skid base plate, the anti-skid base plate extrudes the elastic piece to deform, the friction force between the anti-skid base plate and the end face of the bolt column is increased, and therefore looseness prevention is achieved. When the threaded shaft sleeve and the bolt column are locked, the friction force between the anti-skid base plate and the end face of the bolt column is increased through the counter-acting force of the elastic piece, and therefore looseness prevention is achieved, and the problems that an existing threaded shaft sleeve is prone to looseness, and monitoring reliability and stability are poor are solved.

The invention provides a preparation method and an evaluation method of a bonded wafer, and the method comprises the steps: providing the bonded wafer, carrying out a thermal strengthening process on the bonded wafer, the process temperature of the thermal strengthening process is X, the process time of the thermal strengthening process is Y, Y =-0.5 X + 700, and X is greater than or equal to 1100 DEG C and less than or equal to 1300 DEG C; according to the invention, the bonding force of the bonded wafer can be improved, and meanwhile, slip lines are prevented from being generated.

The application discloses a tape grinding method for silicon wafer processing, which comprises the following steps: installing a grinding tape with a granularity parameter greater than #2000 on an edge polishing machine; setting grinding parameters and polishing parameters of the edge polishing machine; wherein the grinding time of a BCF part of the silicon wafer is greater than the grinding time of ACF and TOP parts, in the embodiment of the application, a grinding tape model with a finer granularity parameter is adopted to reduce the mechanical damage layer of the silicon wafer grinding part, and different grinding times are set for the BCF, ACF and TOP parts of the silicon wafer, since the grinding time parameter of the BCF part of the silicon wafer is greater than the grinding time of the ACF and TOP parts, the mechanical damage layer generated by the ACF part of the silicon wafer is smaller relative to the BCF part, on the basis of shortening the edge polishing time, the good processing surface of the ACF part of the silicon wafer is ensured, the direct shortening of the edge polishing time is avoided to cause the slip lines and layer faults of the silicon wafer epitaxy, and the grinding and polishing efficiency of the silicon wafer is greatly improved, so that the production capacity of a single edge polishing machine is improved.

The invention relates to the technical field of machining, and discloses a chamfering tool metal dead zone shape prediction method based on a slip line theory. The method comprises the steps that firstly, a chamfering cutting edge right-angle cutting slip line field model is constructed, a right-angle cutting coordinate system is established with an S1 point as an original point, then an S1 point Moire circle model is established based on the plastic deformation theory, and the size of an included angle omega 1 formed by a metal dead zone boundary S1S3 and a chamfering S1S2 is solved in combination with the Coulomb friction theorem; and then determining a slope relational expression of the line segment S2S3 and the line segment DN through a geometrical relationship, establishing an equation to solve the height of a shunt point, and finally solving the length 1 of the lower boundary of the metal dead zone, thereby realizing prediction of the shape of the metal dead zone. According to the method, the mathematical relationship between the parameters of the cutting edge of the chamfering tool and the shape of the metal dead zone is established particularly for the shape of the dead zone of the cutting edge of the chamfering tool, so that the boundary of the dead zone can be represented according to the parameters of the cutting edge of the chamfering tool, and the prediction effect of the shape of the metal dead zone of the chamfering tool is achieved.

The utility model relates to the technical field of television tuners, and discloses an environment-friendly television tuner with a degradable shell, which comprises a shell, a C-shaped groove is arranged at the top of the outer surface of the shell, a C-shaped strip is inserted into the inner surface of the C-shaped groove, and a sliding cover is fixedly connected to the top end of the outer surface of the C-shaped strip. The inner surface of the sliding cover is slidably connected with the top of the outer surface of the shell, an arc-shaped protruding block is fixedly connected to the inner surface of the sliding cover, a groove is formed in the top of the outer surface of the shell, the outer surface of the arc-shaped protruding block is connected with the inner surface of the groove in a clamped mode, a connecting assembly is arranged on the outer surface of the shell, and the connecting assembly comprises a threaded head. According to the utility model, the C-shaped groove is connected with the C-shaped strip in an inserted manner, so that the stability and guidance quality of the sliding cover are ensured. Friction force is increased through anti-skid lines outside the sliding cover, the arc-shaped protruding blocks can be disengaged from the grooves to be clamped through shifting, the sliding cover can be rapidly disassembled without tools, and the overhauling efficiency is improved.

The utility model discloses a special-shaped iron stand device capable of performing multifunctional titration test, which comprises a base, a special-shaped rod and a lighting device, a rotating device is arranged on the upper end surface of the base, a mounting cylinder is rotatably arranged in the rotating device, and the lower end of the special-shaped rod is inserted into the mounting cylinder; a butterfly clip is mounted on the special-shaped rod; the lighting device is fixedly arranged on the upper end face of the base and located on the side face of the special-shaped rod. In addition, the anti-slip mat is further included, the anti-slip mat comprises anti-slip lines, the anti-slip mat is arranged on the lower end face of the base, and the anti-slip lines are arranged on the lower end face of the anti-slip mat. Through the arrangement of the rotatable mounting cylinder, the special-shaped rod can rotate through the mounting cylinder, and the mounting cylinder is elastically clamped through the clamping block, so that the mounting cylinder is convenient to rotate and does not automatically rotate in the titration process, and meanwhile, an operator can randomly adjust the position of a beaker according to requirements conveniently.

The utility model belongs to the technical field of dies, and particularly relates to a back door outer plate forming die which comprises an upper die and a lower die, a male die is arranged on the lower die, a female die matched with the male die is arranged on the upper die, the upper surface of the male die is concaved downwards to form a groove, the edge of the groove and the upper surface of the male die form a convex R angle, a convex rib is arranged on the groove, and the convex rib is arranged on the upper surface of the male die. And the included angle alpha between the connecting line of the convex rib and the convex angle R and the upper surface of the convex die is greater than 160 degrees. According to the utility model, the bending and hardening of a material sheet at the ridge line are reduced, so that the lower surface of the material sheet is effectively prevented from being printed, and the formation of a slip line on the appearance surface of a product is effectively avoided.

This invention discloses a method for calculating the ultimate stress of surrounding rock in a non-circular tunnel, belonging to the field of tunnel engineering. The method includes the following steps: establishing a coordinate system with the center of the invert arch as the origin and defining the plastic zone based on fundamental parameters, wherein the fundamental parameters include tunnel geometric parameters, altered rock physical and mechanical parameters, and in-situ stress parameters; deriving the characteristic stresses and rotation angles of the invert arch boundary and the side arch boundary based on the fundamental parameters, the coordinate system, and the Mohr-Coulomb yield criterion to obtain the boundary conditions; deriving the differential and integral equations of the slip line in the plastic zone based on the altered rock physical and mechanical parameters to obtain the basic equations; constructing a computational grid using the finite difference method based on the boundary conditions and the basic equations and iteratively solving the problem to obtain the converged characteristic stresses and rotation angles of the grid nodes; and calculating the ultimate stress distribution of the plastic zone based on the converged characteristic stresses and rotation angles of the grid nodes.

The utility model relates to the technical field of processing and positioning, in particular to a wooden door processing and positioning mechanism which is convenient to turn over a wooden door, more stable in supporting the wooden door and convenient for workers to process the wooden door and comprises a processing table, a supporting table is arranged at the top of the processing table, and supporting frames are arranged on two sides of one end of the processing table. A connecting shaft is arranged at the top of each supporting frame, a supporting arm is installed on each connecting shaft, each connecting shaft is rotationally connected with one end of the corresponding supporting arm, a mounting shaft is rotationally installed at the other end of each supporting arm, a screw hole is formed in each mounting shaft, a lead screw matched with the screw hole is installed in each screw hole, and a screw rod is installed in each lead screw. Clamping and positioning plates are arranged at the ends, close to each other, of the two lead screws, the mounting shafts are damping shafts, non-slip mats are arranged on the sides, close to each other, of the two clamping and positioning plates, screwing blocks are arranged at the ends, away from each other, of the two lead screws, a handle is arranged on each supporting arm, and non-slip lines are arranged at the two ends of each mounting shaft.

The invention provides a method for improving a slip line at the tail of a heavily doped silicon single crystal, and belongs to the technical field of semiconductor manufacturing. Comprising the steps that S1, after material melting is completed, doping is conducted in a gas phase doping mode, so that the doping concentration of a doping agent is increased; s2, when the silicon single crystal grows to 80% of the total length, gradually reducing the furnace pressure to increase the volatilization of the dopant and reduce the enrichment of tail impurities; meanwhile, temperature compensation is carried out to release thermal stress, and lattice deformation at the tail of the crystal bar is reduced. According to the method, a gas phase doping mode is adopted, and meanwhile, the furnace pressure starts to be reduced in the later stage of the equal-diameter process, so that tail impurity enrichment is reduced, and slippage lines generated by tail impurity enrichment are reduced; temperature compensation is synchronously carried out at the later stage of the equal-diameter procedure, slip lines generated due to thermal stress concentration are reduced, and therefore the slip lines generated in different ways are effectively improved, the loss of the available length of the crystal bar is reduced, and the qualified rate of the crystal bar is increased.

The invention relates to the technical field of nuts, and discloses a safety nut with anti-slip lines, which solves the problem that the existing flange nut can not be used in an environment with a higher anti-slip requirement because the existing flange nut is loosened and falls off when being used in a frequent vibration environment only through the anti-slip lines, and comprises a flange nut main body, a gasket is fixedly installed at the bottom of the flange nut body, a plurality of anti-skid lines are arranged at the bottom of the gasket, a threaded hole is formed in the middle of the flange nut body, an equipment box is fixedly installed at the top of the flange nut body, a ring groove is formed in the middle of the equipment box, and four positioning hoops are annularly arranged in the ring groove at equal intervals. Friction pads are fixedly installed on one sides of the four positioning hoops, a pull ring is arranged on one side of the equipment box, and a transmission assembly is arranged at one end of the pull ring. The flange nut has good anti-slipping capacity and can be used in the environment with frequent vibration, and therefore the flange nut can be used in the environment with the higher anti-slipping requirement.

The present invention discloses a method for depositing a thick layer of silicon epitaxial wafer on an ultra-thin substrate for semiconductor power devices. By comprehensively designing key process parameters different from traditional growth temperature, heating power, heating-up time, cooling-down time, etc., the induced defects of epitaxy such as stacking faults, dislocations, slip lines, orange peel, and back and edge crystal point adsorption easily generated by traditional processes are overcome. The traditional process is simplified, the process is simple, the industrial continuous production cost is reduced, and the batch deposition of thick layer silicon epitaxial wafers on 6-inch and 8-inch ultra-thin silicon substrates is realized. The product parameters have good uniformity, and the five-point thickness non-uniformity is <0.8%, meeting the market demand in the industry for thick layer silicon epitaxial wafers on 6-inch and 8-inch ultra-thin substrates.

The invention relates to the technical field of semiconductors, in particular to a method for reducing internal stress of a crystal bar. Comprising the steps that a crystal bar is placed in an ingot furnace, and the ingot furnace is vacuumized; heating the crystal bar to 1000-1300 DEG C at a heating rate of 4-8 DEG C / min, and then cooling the crystal bar to 700-1000 DEG C at a cooling rate of 1-4 DEG C / min to finish primary annealing; the crystal bar is heated to 1000-1200 DEG C at the heating rate of 4-8 DEG C / min, then the crystal bar is cooled to 500-700 DEG C at the cooling rate of 1-4 DEG C / min, and secondary annealing is completed; and the crystal bar is cooled to 50-150 DEG C along with the furnace and discharged out of the furnace. The heating and cooling process with the specific temperature gradient is carried out in the vacuum or low-vacuum environment, so that the internal stress of the crystal bar can be reduced, the probability that the crystal bar generates a slip line is reduced, the mechanical property of the crystal bar is improved, material waste and machining defects caused by the problems of crystal bar breakage and the like are avoided, and the production efficiency is improved. And the overall production cost is reduced.

The invention provides a silicon single crystal rod and an ending method thereof. The silicon single crystal rod comprises an equal-diameter structure; the ending structure is connected to one end, far away from the growth starting end, of the equal-diameter structure, and the radial size of the ending structure is in a change trend of firstly decreasing, then increasing and then decreasing along the growth direction of the silicon single crystal rod; wherein, in the increasing phase, the radial dimension of the ending structure is at least partially increased to exceed the radial dimension of the isometric structure. According to the application, the ending structure with the change trend of decreasing, increasing and decreasing is formed at one end, far away from the growth starting end, of the equal-diameter structure, and the radial size of the ending structure at least partially exceeds the radial size of the equal-diameter structure in the increasing stage, so that an area with the local radial size increased is formed; the sliding line can be effectively prevented from climbing to the equal-diameter structure, internal defect expansion of the crystal is avoided, the yield of the single crystal silicon rod and the performance of the device are improved, and the process cost is reduced.

The utility model discloses a slide wire cleaning device applied to a bridge crane, which comprises a fixing frame, a connecting lug, a file plate and an adjusting frame, the fixing frame is of a rectangular structure, the connecting lug is welded on the left side of the fixing frame, an inner groove is formed in the inner side of the fixing frame, the two sides of the inner groove are of a penetrating structure, an insulating layer is installed in the inner groove, and the file plate is connected with the insulating layer. A file plate is installed in the inner groove, an adjusting frame of a penetrating structure is installed on the fixing frame, and the adjusting frame penetrates through a strip-shaped groove formed in the insulating layer and is connected to the file plate. Under the condition that normal use of the crane is not affected, the pocking marks of the electric car can be removed in the running state, the service life of a carbon brush of the crane can be prolonged, the problem of wire sliding faults generated in the running process of the crane is solved, a large amount of manpower, material resources and time are saved, and the working efficiency is improved. In addition, the control screw can be controlled according to the use requirement of the file plate, the file plate is adjusted by controlling the adjusting frame, and the service life is prolonged.

The utility model discloses an anti-collision anti-slip strip, which belongs to the technical field of anti-collision strips and comprises a pressing strip body, the pressing strip body is integrally extruded and formed, a slug hole is arranged between the front end and the rear end of the pressing strip body, the pressing strip body comprises a protection part and a connection part, the connection part is arranged at the bottom end of the protection part, and anti-slip lines are arranged at the top end of the protection part. A contact surface is arranged at the bottom end of the protection part, and closed-loop inverted buckles are arranged at the two symmetrical side ends of the connection part; after the pressing strip body is installed, the section is prevented from being directly impacted, an anti-skid effect is achieved when the pressing strip body bears objects, the closed-loop inverted buckle is designed to be in a multi-section triangular inverted buckle shape, deformation is not prone to occurring when the closed-loop inverted buckle is used or after multiple times of disassembly and assembly, the pressing strip body can be better installed, the pressing strip can be widely matched with section bars with different wall thicknesses in the market, and the application range is wide.

A stable-connection keel ceiling structure is characterized in that a suspender is in threaded connection with the inner wall of an expansion screw, a rotating sleeve is in threaded connection with the outer wall of the suspender, the outer wall of the rotating sleeve is rotationally connected with a hook, a main keel is hung on the inner wall of the hook, a hanging piece is hung on the outer wall of the main keel, a hanging opening is formed in the outer wall of the bottom end of the hanging piece, and a torsional spring on one side, close to the main keel, of the hanging piece is connected with a pressing piece; the anti-skid lines are arranged on the primary outer wall, close to the main keel, of the pressing piece, the hanging piece is tightly attached to the outer wall of the main keel through tension release of the pressing piece connected with the torsional spring in the installation process, sliding is prevented, and the problems that installation needs to be started from the beginning in the installation process, no limiting structure exists in the installation process, and sliding and deviation are prone to occurring after installation are solved.

The invention relates to the technical field of semiconductors, and provides a method for improving a crystal growth ending slip line and a computer program product. The method comprises the following steps: providing crystals after equal-diameter growth; setting ending process parameters, to be specific, setting the ending temperature to increase in a stepped manner along with the gradual increase of the ending length, setting the ending pulling speed to increase gradually along with the increase of the ending length, and matching the setting of the ending pulling speed with the setting of the ending temperature; setting the ending crucible to linearly increase along with the increase of the ending length, and setting the ending initial crystal transition of the ending crystal to be the same as the equal-diameter growth end-stage crystal transition; and executing an ending process according to the ending process parameters to obtain the non-slip crystal with the conical tail. According to the method, proper ending process parameters are set after equal-diameter growth is completed, so that the crystals can be ended to form a non-slip conical tail, and finally, a high-quality silicon single crystal rod grows.

The utility model discloses an anti-slip self-cleaning knob which comprises a knob body, one side of the outer surface of the knob body is fixedly connected with anti-slip lines, and the other side of the outer surface of the knob body is fixedly connected with anti-slip protrusions. And a storage groove is formed in the upper surface of the knob body. According to the anti-slip self-cleaning knob, through the arrangement of the anti-slip lines, the anti-slip protrusions, the storage groove, the supporting rod and the rubber sleeve, the anti-slip lines and the anti-slip protrusions enhance the anti-slip performance of the surface of the knob body, the supporting rod and the rubber sleeve can conveniently rotate by a certain angle with the fixing rod as the circle center, the supporting rod and the rubber sleeve can be placed in the storage groove when not used, use space is not occupied, and the anti-slip self-cleaning knob is convenient to use. When the rotary knob is used, the rotary knob body is rotated out of the containing groove, the hand grabs the rotary knob body, the rubber sleeve is arranged on the outer surface of the supporting rod in a sleeving mode, comfort and friction force in the using process are enhanced, fingers are limited when the rotary knob body is rotated, the hand exerts force conveniently, rotation slipping can be avoided, labor is saved, and using convenience is improved.

The utility model discloses a universal joint of a PPR pipe fitting, the universal joint of the PPR pipe fitting comprises a locking piece and two connecting pieces, the connecting pieces are in a circular ring shape, and the connecting pieces are provided with annular steps in an array mode in the axial direction so that the PPR pipe fitting can be connected in an inserted mode. The diameter of the annular step is gradually increased from one end of the connecting piece to the other end of the connecting piece, so that the whole connecting piece is conical, a connecting part is arranged at the end, with the largest diameter, of the annular step, and the locking piece is connected with the two connecting pieces through the connecting part; the outer surface of the annular step is an inclined plane, the inclination direction of the inclined plane is consistent with the conical direction of the connecting piece, and anti-skid grains are arranged on the inclined plane. According to the technical scheme, two PPR pipe fittings of different specifications can be connected, the use flexibility is improved, and the use cost is reduced. And the universal joint can be firmly connected to the PPR pipe fitting without cutting, polishing and other operations on the PPR pipe fitting, so that the working efficiency of constructors is improved.

The utility model provides a concrete admixture sampling device, in particular to the technical field of admixture sampling, which comprises an insertion rod and a convenient mechanism, one end of the insertion rod is fixedly connected with an insertion head, and the other end of the insertion rod is fixedly connected with anti-skid grains. The insertion depth of the plug can be observed more conveniently through scale marks, sampling is more convenient, an admixture enters the plug when the plug is inserted, after insertion, the push rod is pushed, the push rod is in sliding connection with the first fixing plate and the second fixing plate, and the tension spring is stretched, so that the second push plate is pushed into the through hole of the plug, and the admixture in the through hole is pushed out; when a new admixture flows backwards into the plug, the second push plate is continuously pushed in, the admixture is pushed out, the second push plate is made to abut against the baffle ring, at the moment, the first push plate is also pushed into the plug, and sealing is conducted, so that sampling of the corresponding depth is completed.

The utility model provides a furniture anti-collision edge band convenient to install, and relates to the technical field of anti-collision edge bands, the furniture anti-collision edge band comprises an anti-collision edge band, a bayonet is formed in the anti-collision edge band, an outer notch is formed in the right portion of the outer side face of the anti-collision edge band, an upper anti-skid piece is arranged on the upper side wall in the anti-collision edge band, and a lower anti-skid piece is arranged on the lower side wall in the anti-collision edge band. An upper anti-skid piece is arranged on the inner lower side wall of the anti-collision edge sealing strip, a lower anti-skid piece is arranged on the inner lower side wall of the anti-collision edge sealing strip, the upper anti-skid piece and the lower anti-skid piece are vertically and oppositely arranged, the anti-collision edge sealing strip is made of PVC resin materials, anti-skid lines are arranged on the upper surface and the lower surface of the anti-collision edge sealing strip and adopt cross-shaped lines, and multiple sets of springs are arranged on the inner right side wall of the anti-collision edge sealing strip. And the front end of the spring is fixed to an inner extrusion plate, the inner extrusion plate is made of a rock wool plate material, and an inner cushion layer is arranged at the front end of the inner extrusion plate. The anti-slip sleeve is convenient and rapid to sleeve, favorable for better buffering collision impact force, safe, anti-slip, not prone to disengagement after being sleeved, safer, more convenient and more practical.

The invention relates to the technical field of geotechnical engineering foundation pit support design, in particular to a foundation instability limited width filling foundation pit support soil pressure slip line solution calculation method, and aims to solve the problems that a foundation is simplified into a rigid body and the combined action of the foundation and a structure is ignored in a traditional method. A unified calculation model fusing an active area behind a wall, a passive area in front of the wall and a foundation plastic area is established, differential numerical solution is performed by adopting a characteristic line method through a simultaneous static equilibrium equation and a yield criterion, and construction and stress state calculation of a slip line field are realized by utilizing three types of boundary value problems. According to the method, the active soil pressure and the passive soil pressure borne by the retaining wall and the ultimate bearing capacity of the foundation under the condition of foundation instability can be accurately solved, the accuracy and the engineering applicability of soil pressure calculation under the working conditions of limited width filling and soft soil foundations are remarkably improved, and a reliable theoretical basis is provided for optimal design of a supporting structure.