279 results about "Surface friction" patented technology

The invention belongs to the technical field of electric digital data processing and foundation engineering, and discloses a method for calculating stress and displacement of a foundation pile in a soil body under the action of a pile top axial load, which comprises the following steps of: taking the pile top as an origin of coordinates, and taking the downward direction of the longitudinal axis of a pile body as a z axis; according to the basic mechanical equilibrium condition of an infinitesimal body formed by the micro-section length randomly selected in the axial direction of the pile body, the boundary condition of the force at the top end of the pile and the deformation coordination relation between the bottom end of the pile and the foundation, characteristic variables reflecting the pile body stress and displacement distribution mode are solved; and according to the basic mechanical equilibrium condition of the infinitesimal body, the boundary condition of the force at the top end of the pile and the characteristic variables, the pile body axial displacement, the pile body axial force and the pile side surface friction resistance at different depths in the axial direction of the pile body are solved. The rapid and effective method and scientific basis are provided for design calculation and analysis of the foundation pile in the soil body under the action of the axial load of the pile top, and the method has important technical method significance and engineering application value.

The invention discloses a low-speed reciprocating type curved surface friction testing machine for simulating human knee joints, and relates to the technical field of testing material friction performance, the low-speed reciprocating type curved surface friction testing machine comprises a machine body, the machine body is movably provided with an upper clamping assembly for clamping an upper experiment piece and a lower clamping assembly for clamping a lower experiment piece; the machine body is also provided with a lifting driving mechanism for driving the lower clamping assembly to move upwards, and the lifting driving mechanism drives the lower experiment piece to ascend to enable the top of the lower experiment piece to abut against the bottom of the upper experiment piece with preset pre-pressure so as to simulate the load state of the knee joint of the human body; the machine body is further provided with a swing driving device for driving the upper clamping assembly to swing back and forth, and the swing driving device drives the upper experiment piece to swing back and forth so that friction can be formed between the upper experiment piece and the lower experiment piece to simulate friction movement of the knee joint of the human body. Friction movement of a human knee joint in a load state is simulated, so that an in-vitro experiment on a human knee joint prosthesis material is realized, and medical negligence caused by unqualified materials is avoided.

The invention relates to the technical field of photovoltaic module frames, in particular to a self-cleaning weather-proof aluminum alloy photovoltaic module frame and a preparation method thereof, and aims to improve the self-cleaning capacity of the photovoltaic module frame, a layer of self-cleaning coating is prepared on the basis of an aluminum alloy frame body. The boric acid ester chain extender containing the fluorine element and the fluorine-containing polyol are added, and the fluorine element has extremely strong electronegativity, so that the water resistance of the resin can be effectively improved, the surface energy of the material is reduced, the surface friction is reduced, the friction resistance is improved, the adsorption of dust on the surface of a metal frame can be reduced, and the material is kept clean for a long time; a reversible covalent bond boric acid ester bond is further introduced into the boric acid ester chain extender, so that the purpose of self-repairing is achieved, hydrophobic nano-silica is further added into the coating, the friction resistance and hydrophobic capacity of the aluminum alloy photovoltaic module frame are further improved, and the service life of the aluminum alloy photovoltaic module frame is prolonged. And the durability of the material exposed in an external atmospheric environment is improved.

The invention discloses a self-adaptive parallel clamp and method suitable for a bush-disc test, and belongs to the technical field of mechanical engineering, the self-adaptive parallel clamp comprises a supporting mechanism, a parallelism adjusting mechanism is arranged in the supporting mechanism, the lower end of the supporting mechanism is connected with a clamping rod, the lower end of the clamping rod is provided with a sample clamping mechanism, and the sample clamping mechanism is provided with a clamping mechanism. And a movement mechanism is arranged at the lower end of the sample clamping mechanism. By adopting the self-adaptive parallel clamp suitable for the lining-disc test, the problem of parallelism error between the lining and the disc is solved, so that the horizontal load error and the friction force and friction coefficient measurement error caused by the error are reduced, and a more accurate surface-surface friction wear disc test is realized.

The invention belongs to the technical field of material conveying, and particularly relates to a material conveying device for building construction, which comprises a moving plate and moving wheels arranged at four corners of the lower side wall of the moving plate. After the discharging end of the material conveying device ascends by a certain angle, anti-slip strips can be automatically arranged on the surface of the conveying belt, the conveying capacity of conveying is improved through the anti-slip strips, and the situation that gravel materials slide due to the fact that the ascending angle of the conveying belt is too large is avoided; the anti-slip strip and the conveying belt can be unfixed, the problem that the anti-slip strip abuts against the material distributing plate is solved, fixed-point discharging is conducted on materials on the surface of the conveying belt through the material distributing plate, meanwhile, the abrasion degree of the surface of the conveying belt can be detected, and when it is detected that the friction force of the surface of the conveying belt becomes small due to abrasion, the anti-slip strip and the conveying belt are fixed. Operators can be reminded to replace the conveying belt in time, and the conveying performance of the conveying device is guaranteed.

The invention discloses a constant-tension self-compensation coating method and an intelligent deviation adjusting method, and belongs to the technical field of material dynamic characteristic on-line testing and cooperative control, and the constant-tension self-compensation coating method comprises the following steps: obtaining stress distribution data of the surface of a coating base material, generating a multi-mode optical data set, analyzing a real-time tension estimated value and material dynamic characteristic parameters, and obtaining a multi-mode optical data set; wherein the dynamic characteristic parameters of the material comprise an equivalent elastic modulus and a surface friction coefficient; generating a dynamic coupling coefficient based on the real-time tension estimation value and the dynamic characteristic parameters of the material, performing analysis and calculation, and outputting a tension compensation control quantity and a deviation adjustment control quantity; and the tension compensation control quantity is executed to adjust the unwinding or winding torque, and meanwhile, the deviation adjusting control quantity is executed to adjust the angle of a deviation correcting guide roller. According to the method, the dynamic characteristics of the material are analyzed in real time by adopting multi-mode optical perception, and the tension deviation coupling model is constructed, so that interference advanced cooperative inhibition and working condition self-adaptive stable coating can be realized.

The utility model relates to the technical field of drawing equipment, in particular to multi-pass wire drawing equipment. The equipment comprises a drawing cone pulley mechanism and a heating furnace, the drawing cone pulley mechanism comprises a cone pulley, and the surface of the cone pulley is divided into at least Z sections of areas in the axial direction of the cone pulley; wherein the surface roughness of each section of area is different, so that the surface friction coefficient of each section of area is different; the total drawing pass is M, and when M is larger than or equal to 2, Z is larger than or equal to 2 and smaller than or equal to M, so that at least one pass of wire drawing is conducted on each area. The drawing cone pulley solves the problem that due to the fact that the number of drawing passes is increased, the sliding coefficient difference between the first pass and the last pass is too large, and wires are broken, and the drawing efficiency of a single machine is remarkably improved.

The simulation experiment device for the frictional wear behavior of the surface of the artificial hip joint sample comprises a rack, a hydraulic loading mechanism, a hip joint simulation opposite-grinding pair mechanism, a composite motion mechanism, a lubricating liquid adding mechanism and an abrasive dust adding mechanism, and the simplification of the opposite-grinding pair structure and the simulation of an opposite-grinding track are both considered; a lubricating liquid adding mechanism and an abrasive dust adding mechanism are introduced in combination with actual conditions, artificial hip joint friction wear simulation under different lubricating conditions and abrasive dust forming conditions can be better simulated, and the artificial hip joint friction wear simulation device is more suitable for artificial joint material performance evaluation and selection under laboratory conditions.

The present invention belongs to the technical field of microelectromechanical systems, and discloses a conformal MEMS friction sensor for measuring the surface friction of a conical model and an assembly method thereof. The conformal MEMS friction sensor includes a packaging housing, a head structure and an interface circuit; the packaging housing protects the head structure and the interface circuit through an upper and lower locked packaging cover plate and a packaging base. The conformal MEMS friction sensor is installed on the surface of the conical model perpendicular to the generatrix of the conical model, directly measures the surface friction in the direction parallel to the generatrix, and performs friction measurement with automatic deduction of the pressure difference resistance. The assembly method includes the assembly of the silicon-glass microstructure and the interface circuit, the assembly of the floating element, and the assembly of the packaging housing. The conformal MEMS friction sensor for measuring the surface friction of the conical model and the assembly method thereof of the present invention have the characteristics of small volume, good temperature stability, high reliability, etc., and can accurately measure the frictional resistance on the surface of the conical model.

The invention discloses a device and method for dynamically measuring the surface friction of a wind tunnel test model, and belongs to the technical field of wind tunnel tests. In order to solve the problem that the measurement result is unstable when a pitot tube probe is used, the device comprises a pitot tube probe, a support, a spur rack, a gear, a stepping motor, a baffle and a motor connecting seat, a through hole is formed in the middle of the support and used for containing a pitot tube probe, the bottom of the through hole of the support is connected with a pressure measuring tube, the lower surface of the top of the support is fixedly connected with a spur rack, the spur rack is connected with a gear, and the gear is connected with a stepping motor through a motor connecting base. The side face of the motor connecting base is fixedly connected with a baffle, and a screw hole is formed in the baffle. According to the invention, the boundary layer velocity profile can be rapidly scanned and measured under the condition of low cost, so that the wall friction resistance coefficient is obtained. The device can be used for most wind tunnel test scenes, can realize near-wall measurement on a flat plate or a curved surface of a machine body, and is not easy to damage under high-temperature, high-pressure and high-speed conditions.

The invention belongs to the field of machining surface treatment devices, and discloses an electroplating front surface treatment device and method.The electroplating front surface treatment device comprises an electric telescopic rod, a supporting frame and a polishing assembly, a fixing frame is arranged at the upper end of a hub frame, the supporting frame is slidably connected to the upper end of the fixing frame, and the polishing assembly is fixed to the front end of the supporting frame; the polishing assembly comprises memory metal, a flexible layer, a first rotating shaft, a second rotating shaft, polishing paper and a synchronous belt, the outer sides of the first rotating shaft and the second rotating shaft are sleeved with the polishing paper, a limiting assembly is slidably arranged on the inner side of the supporting frame, and a traction rod is fixed to the side, close to the second rotating shaft, of the supporting frame; after the memory metal on the polishing assembly receives the pressure given by the spoke, the memory metal can be bent and wound on the outer side of the spoke, the polishing paper is driven by the servo motor to rub on the surface of the spoke, and therefore welding seams at the upper end of the spoke can be polished in multiple directions, and the time for polishing the welding seams in different directions can be saved.

The invention provides a nano smooth surface treatment method and system suitable for aircraft drag reduction. The nano smooth surface treatment method comprises the steps that sand blasting treatment is conducted on an operation part of the surface; the operation part is divided into strips; determining a scanning path according to the strip; determining the laser power, the scanning rate and the defocusing amount according to the strip and the target roughness, and formulating a laser strategy; polishing according to a laser strategy; and cleaning the polished surface. According to the method, a nano finish treatment method is adopted, the aerodynamic resistance of the high-speed flying aircraft is reduced under the condition that the structure is not changed, the technological operation is simple and feasible, the surface friction resistance of the high-speed aircraft is reduced by 40% or above under the condition that no attack angle exists, and the effects of increasing the voyage and reducing aerodynamic heat are achieved.

The invention discloses a friction in-situ self-sensing method and a friction in-situ self-sensing device for a magnetic-sensitive rubber polymer, relates to the field of rubber friction sensing detection, and comprises a magnetic-sensitive rubber polymer friction self-sensing principle, a self-sensing array design technology and a three-dimensional force detection principle. The device comprises a loading driving module, an electromagnetic regulation and control module and an acquisition control module. The device has the capability of autonomously sensing interface contact friction and the characteristic of autonomously regulating and controlling friction by a magnetic field, normal stress and shear stress in the magnetic-sensitive rubber and the accurate position of a stress point can be detected in real time through the flexible array sensor in the magnetic-sensitive rubber, and then a beam-spring model is established to deduce a stress-friction force relationship; and calculating the magnitude and direction of the surface friction force of the magnetic-sensitive rubber so as to realize in-situ self-sensing of the interface friction of the magnetic-sensitive rubber. The method and the device are effectively combined with a computer system, friction force can be directly measured and regulated without the help of an external sensor, the structure is simple, and the method and the device have wide prospects in the field of rubber friction.

The invention relates to blow molding equipment for PE (polyethylene) film production and a processing method, which are applied to the field of film blowing equipment, a swing frame and two obliquely arranged roll shafts are utilized, so that the switching of worn roll shafts can be quickly realized, the possibility of shutdown adjustment is avoided, the continuity of blow molding processing is guaranteed, in addition, during blow molding processing, the production efficiency is improved, and the production cost is reduced. Cleaning brush strips can clean dust on the surfaces of the roller shafts in a rotating state, the quality in the film machining process is guaranteed, and after the positions of the abraded roller shafts are switched, the positions of the abraded roller shafts can be changed through the design of a third motor, a movable rack, a brush plate, a first motor and a friction disc; the roller shaft in the abraded state after position switching can be subjected to circumferential surface repairing treatment, subsequent continuous use can be conveniently waited, in this way, switching use of the two roller shafts can be achieved, replacement necessity is avoided, and the roller shaft can be conveniently replaced when the inclination angle of the swing frame is adjusted due to the fact that the surface thickness of the roller shaft is increased during subsequent repairing. And the electric extension rod is used for assisting the friction disc to make friction contact with the surface of the shaft piece on the surface of the roller shaft again.

The invention discloses a hydraulic fracturing ground stress testing device and method, and relates to the technical field of hydraulic fracturing, and the hydraulic fracturing ground stress testing device comprises testing equipment. According to the hydraulic fracturing ground stress testing device and testing method, through the design of testing equipment, a water source enters the water pump pipe from the water inlet pipe, water flow is sprayed outwards from the nozzle in the water pump pipe, so that the hydraulic fracturing effect is achieved, the rotating mechanism is driven to rotate through flowing of the water flow, and the effect of cleaning the inner wall of a pipeline through friction is achieved; the rubber pipe is extruded by sliding the packing top block on the packing base, so that the rubber pipe is extruded and deformed to be attached to the surface of soil, the packing effect on a test part is achieved, the silica gel column is arranged in the rubber pipe, the silica gel column has a certain supporting effect and prevents a part from being concaved inwards and collapsed, and the rhombic film is arranged on the outer side of the rubber pipe, so that the rubber pipe is prevented from falling off. Therefore, surface friction force of components is increased, service life of the components is prolonged, and friction load is dispersed.

The present invention relates to the technical field of film sealing and cutting equipment, and specifically discloses a sealing and cutting mechanism of a fully automatic film sealing and cutting packaging machine, including a base, a first mounting frame fixedly connected to the side of the base, and a second mounting frame fixedly connected to the upper surface of the base. When the motor drives the second winding roller to rotate, the transmission belt rotates and links the transfer rod, the inner end of the transfer rod is connected to the crank, the two ends of the crank rotate on the inner surface of the bottom of the side plate, and the output end is connected to the drive plate, the drive plate is hinged with the extrusion plate, and the extrusion plate is prompted to move up and down reciprocatingly. The friction belt on the inner surface of the transmission belt cooperates with the friction ring of the transfer rod. Because the rotating shaft of the second winding roller is smooth, its intermittent rotation is realized, and the first winding roller is coordinated to pull the film group forward intermittently, and the forward movement is stopped, and the design of the crank makes the sealing and cutting assembly always in a working state, that is, the continuous up and down movement of the sealing and cutting mechanism and the intermittent advancement of the film group are coordinated to ensure the continuity of sealing and cutting, greatly improving the production efficiency.

The invention relates to the technical field of film sealing and cutting equipment, and particularly discloses a sealing and cutting mechanism of a full-automatic film sealing and cutting packaging machine, the sealing and cutting mechanism comprises a base, the side surface of the base is fixedly connected with a first mounting frame, and the upper surface of the base is fixedly connected with a second mounting frame. When the motor drives the second winding roller to rotate, the transmission belt rotates and is in linkage with the switching rod, the inner end of the switching rod is connected with a crank, the two ends of the crank rotate on the inner surface of the bottom of the side plate, the output end of the crank is connected with a driving plate, and the driving plate is hinged to the extrusion plate to promote the extrusion plate to move up and down in a reciprocating mode. Due to the fact that a rotating shaft of the second winding roller is smooth, intermittent rotation of the rotating shaft is achieved, the rotating shaft cooperates with the first winding roller to pull the film set to move forwards intermittently, the rotating shaft stops when the film set moves forwards, the sealing and cutting assembly is in a working state all the time through the design of the crank, namely continuous vertical movement of the sealing and cutting mechanism is matched with intermittent advancing of the film set, sealing and cutting continuity is guaranteed, and production efficiency is greatly improved.

The utility model discloses a frameless car door glass sealing strip in the technical field of car sealing strips, which comprises a mounting end used for being connected with a car body B / C column, a first contact end used for being in contact sealing with one side, facing the car body B / C column, of car door glass, and a second contact end used for being in contact sealing with one side, facing the interior of a car body, of the car door glass. The anti-abrasion layers are arranged on the faces, used for making contact with the automobile door glass, of the first contact end and the second contact end, the anti-abrasion layers and the frameless automobile door sealing strip are integrally formed, the integrally-formed anti-abrasion layers are lower in surface friction coefficient, better in anti-abrasion performance and better in surface flatness, and the service life of the sealing strip can be greatly prolonged.

The present invention belongs to the technical field of material conveying, and in particular, relates to a material conveying device for construction, including a movable plate and movable wheels arranged at the four corners of the lower side wall of the movable plate. The present invention can automatically set anti-skid strips on the surface of the conveyor belt after the discharge end of the material conveying device rises to a certain angle, and utilizes the anti-skid strips to improve the conveying capacity, and avoid the situation where the conveyor belt rises too much, which will cause the sand and gravel materials to slip, and when the material is discharged at a fixed point by using the dividing plate, the fixation between the anti-skid strip and the conveyor belt can be released, avoiding the problem of the anti-skid strip and the dividing plate conflicting with each other, and when the material on the surface of the conveyor belt is discharged at a fixed point by using the dividing plate, the wear degree of the conveyor belt surface can be detected, and when the detection finds that the surface friction of the conveyor belt is reduced due to wear, the operator can be reminded in time to replace the conveyor belt, thereby ensuring the conveying performance of the conveying device.

The utility model provides a seismic mitigation and isolation building support which comprises an upper support, a plane stainless steel plate, a plane wear-resisting plate, a spherical crown and a lower support assembly, the upper support is connected with the upper portion of a bridge structure, and the lower support assembly is connected with the lower portion of the bridge structure or a foundation part; the planar stainless steel plate is arranged on the upper support, the planar wear-resisting plate is arranged on the upper surface of the spherical crown, and the planar stainless steel plate and the planar wear-resisting plate are fixedly connected or can be slidably connected in at least one preset direction, so that the requirements of different application scenes are met, and the application range is wide; the curved surface of the spherical crown is in sliding connection with the lower support assembly. The combination of the upper support, the plane stainless steel plate, the plane wear-resisting plate, the spherical crown and the lower support assembly is adopted, compared with a traditional complex curved surface friction pair design, the whole structure is simple, the design is reasonable, the manufacturing and installing difficulty and the fault risk caused by the complex structure are reduced, the stability and reliability of the building support are improved, and the service life of the building support is prolonged.

The utility model discloses a bridge cylindrical surface tension and compression support which comprises an upper support assembly, a cylindrical surface assembly, a piston assembly, a middle support assembly and a lower support assembly. The piston assembly comprises a piston, a large circular groove is formed in the bottom of the piston, and a rubber plate is embedded in the large circular groove; the middle support assembly comprises a middle lining plate, and the top of the middle lining plate is also arranged in the large circular groove in the bottom of the piston; a sealing ring is further arranged between the rubber plate and the middle lining plate, and the rubber plate is sleeved with the sealing ring. The cylindrical surface friction pair and the rubber plate are adopted in the upper structure and the lower structure of the support respectively to meet different rotating deformation requirements of a bridge in the longitudinal bridge direction and the transverse bridge direction, meanwhile, the L-shaped guide rails are arranged in the longitudinal bridge direction and the transverse bridge direction respectively to transmit vertical drawing force of the structure, the stress and deformation functions of the support structure are clear, and later inspection and maintenance are facilitated.

According to the engineering application-oriented flexible sleeve tooth connection rigidity characteristic rapid analytical calculation method provided by the invention, the contact surface friction force is considered, the engineering application-oriented flexible sleeve tooth connection rigidity characteristic rapid analytical calculation method is developed, the nonlinear rigidity can be calculated according to the size parameters of flexible sleeve tooth connection, and the engineering application-oriented flexible sleeve tooth connection rigidity characteristic rapid analytical calculation method is developed. The method provides a basis for relatively accurately estimating the resonance rotating speed of the rotor system, and has important theoretical value and engineering significance for the safety design of the engine rotor system.

This invention relates to an embossing and conveying device for inner lining paper, comprising an embossing roller, which includes an embossing roller body and a rubber ring layer fitted onto the embossing roller body. The width of the rubber ring layer matches the width of the inner lining paper. This technical solution effectively avoids leaving a dent of similar width to the inner lining paper due to friction on the surface of the embossing roller layer of the rubber layer during the inner lining paper's movement, and also avoids the rubber layer around the dent scratching the inner lining paper. This extends the service life of the rubber embossing roller. It significantly improves the service life of the device, reduces the probability of poor inner lining paper conveying due to wear during production, reduces the risk of quality defects such as poor folding of the inner lining paper, and improves production efficiency.

The present invention discloses a method and device for detecting the charge state of an insulating surface. The method comprises: establishing a wind tunnel simulation test platform for simulating the charge state of an insulating surface of a blade when rotating at high speed; based on the established wind tunnel simulation test platform, setting different test times, wind speeds, and angles between the insulating surface and the oncoming airflow for testing, and obtaining the charge states of the insulating surface formed under different test times, wind speeds, and angles between the insulating surface and the airflow; establishing an insulating surface charge distribution measurement system, and measuring the potential distribution of the charge states of the insulating surface formed under different test times, wind speeds, and angles between the insulating surface and the airflow, and obtaining different measurement results; and performing comparative analysis based on the different measurement results to obtain the influence of time, wind speed, and the angle between the insulating surface and the airflow on the frictional charging of the insulating surface.

The invention belongs to the technical field of high-performance aluminum alloy surface functional coatings, and discloses an aluminum alloy composite wear-resistant coating and a preparation method thereof.The method comprises the steps that the surface of an aluminum alloy matrix is pretreated, so that the surface is clean and dry; through a laser-assisted cold spraying method, dry aluminum alloy powder is sprayed on the surface of the pretreated aluminum alloy matrix, and a laser-assisted cold spraying coating is formed on the surface of the aluminum alloy matrix; a laser-assisted cold spraying coating is polished, cleaned and dried, then micro-arc oxidation treatment is carried out, an Al2O3-based ceramic wear-resistant coating is formed on the surface layer of the laser-assisted cold spraying coating, then cleaning and drying are carried out, and the aluminum alloy composite wear-resistant coating is prepared on the surface of an aluminum alloy matrix. Through the synergistic effect of the two technologies of laser-assisted cold spraying and micro-arc oxidation, the surface friction performance of the aluminum alloy is remarkably improved, and the high requirements of the fields of mechanical manufacturing, aerospace and the like for the wear resistance of aluminum alloy components are met.

The utility model relates to the technical field of drawing equipment, in particular to a drawing cone pulley, a drawing cone pulley mechanism and multi-pass wire drawing equipment. The surface of the drawing cone pulley is divided into at least Z sections of areas along the axial direction; wherein the surface roughness of each section of area is different, so that the surface friction coefficient of each section of area is different; wherein the total drawing pass is M, and when M is larger than or equal to 2, Z is larger than or equal to 2 and smaller than or equal to M, so that at least one pass of wire drawing is conducted on each area. The drawing cone pulley solves the problem that due to the fact that the number of drawing passes is increased, the sliding coefficient difference between the first pass and the last pass is too large, and wires are broken, and the drawing efficiency of a single machine is remarkably improved.

The present invention relates to the technical field of surface friction testing, and discloses a detection system and process for studying the surface wear resistance of cable materials. A detection system for studying the surface wear resistance of cable materials includes a detection table, an environmental simulation component and a dynamic adjustment mechanism arranged on the surface of the detection table, a specimen arranged inside the dynamic adjustment mechanism, and an abrasion resistance testing component arranged above the specimen. By means of the provided dynamic adjustment mechanism, when the servo motor runs, it can drive the specimen to move back and forth for abrasion resistance testing under static conditions. When the torsion component runs, it can drive the specimen to perform abrasion resistance testing under rotational and torsional states. When the vibration component runs, it drives the specimen to perform abrasion resistance testing under a vibrating state. Thus, the rotation, torsion, vibration and other movements of the cable can be accurately simulated, making the test results closer to the actual use scenario, being able to comprehensively evaluate the abrasion resistance of the cable material, and achieving the effect of improving the quality and service life of the cable.

The utility model discloses a BOPP (biaxially-oriented polypropylene) unwinding device, which belongs to the technical field of film unwinding devices and comprises a base, a distance adjusting mounting frame arranged on the upper end face of the base, a movable frame slidably mounted on the distance adjusting mounting frame, a conical pressing part used for being inserted into two ends of a paper tube of a BOPP film roll for clamping and fixing, and an anti-loosening pressing part mounted on the movable frame and used for providing rotation damping. According to the technical scheme, the distance between the movable frames is adjusted through the distance adjusting mounting frame, then the distance between the conical pressing pieces is adjusted, the conical pressing pieces are inserted into the two ends of a film roll paper tube, then clamping force is applied to achieve the fixing effect, and film rolls of different lengths and different calibers can be fixed; the anti-loosening pressing piece is in friction contact with the surface of the film roll, certain damping force is provided, and it is guaranteed that when unwinding is stopped, the BOPP film roll cannot continue to be unwound due to inertia rotation.

The present invention discloses a tensile and compressive resistant multi-frequency seismic isolation cylindrical friction pendulum bearing, the bearing comprises an upper pendulum, an upper pendulum slide plate, an upper pendulum fastener, a rotating body, a rotating slide plate, a lower pendulum fastener, a lower pendulum slide plate and a lower pendulum which are arranged in sequence; the upper pendulum and the lower pendulum are arranged in a staggered manner, the lower surface of the upper pendulum is provided with two flanges I on both sides along its length direction, the upper surface of the upper pendulum fastener is provided with limiting plates I matching with the flanges I on both sides, the lower surface edge of the upper pendulum fastener is provided with an annular limiting protrusion, the upper surface edge of the lower pendulum fastener is provided with an annular limiting protrusion, the annular limiting protrusion and the annular limiting protrusion match each other, the upper surface of the lower pendulum is provided with two flanges II on both sides along its length direction, and the lower surface of the lower pendulum fastener is provided with limiting plates II matching with the flanges II on both sides. The present invention realizes the horizontal longitudinal and transverse bridge direction limiting and angle rotation functions under normal circumstances; realizes the seismic reduction and isolation and automatic reset after earthquake during earthquake; and the support has the tensile resistance and torsion suppression functions during the entire operation process.

The utility model discloses a lifting hook, and relates to the technical field of lifting hooks, the lifting hook comprises a lifting ring connected with a lifting device, the lifting ring is provided with a lifting hook, and an anti-falling plate is rotatably arranged at an opening of the lifting hook; the lifting hook is fixedly sleeved with an elastic sleeve for hanging a lifting rope, and limiting baffles are arranged at the positions, located at the two ends of the elastic sleeve, of the lifting hook; the anti-falling plate is rotationally arranged at the opening of the lifting hook and can be automatically closed after the lifting rope is hung, so that the lifting rope is prevented from accidentally separating from the lifting hook; the elastic sleeve can increase the friction force between the elastic sleeve and the lifting rope and is matched with the limiting baffles at the two ends of the elastic sleeve, transverse displacement of the lifting rope caused by shaking of the heavy object is limited from the contact surface friction layer and the physical blocking layer, the lifting stability of the heavy object is effectively improved, the unhooking risk is reduced, and the safety of lifting operation is guaranteed.