Showing papers on "Slewing bearing published in 2020"

Optimization design of structural parameters of single-row four-point contact ball slewing bearing

Abstract: The single-row four-point contact ball slewing bearing has a large structure and is subjected to heavy load, which requires extremely high carrying capacity. The structural parameters of the ball diameter and the number of balls are optimized with the fixed size of the inner and outer rings of the slewing bearing. Numerical methods based on static bearing capacity and fatigue life are used to optimize the structural parameters of the slewing bearing. The finite element model and the local finite element model of the slewing bearing are established to analyze the carrying capacity of different structural parameters. The Hertz contact theory and the experiment are used to compare the theoretically calculated load distribution, contact stress, contact area and deformation. Optimization of structural parameters of the slewing bearing is beneficial to improve the carrying capacity and service life, which provides an important reference for designers.

Life prediction of slewing bearing based on isometric mapping and fuzzy support vector regression

Abstract: The monitoring data of slewing bearing is massive. In order to establish accurate life prediction model from complex vibration signal of slewing bearing, a life prediction method based on manifold ...

Remaining Useful Life Assessment of Slewing Bearing Based on Spatial-Temporal Sequence

Abstract: Slewing bearing is one of key components in the large size machinery and its remaining useful life (RUL) prediction is required to schedule a future action to avoid catastrophic events, extend life cycles, etc. The vibration-based method has been widely used in the RUL prediction. However, the spurious fluctuation usually exists in the vibration signal when the machines are operated under complex conditions. In order to enhance performance of RUL prediction model, two kinds of new health indicators are constructed by the spatial-temporal (ST) information firstly. One is the temporal indicators, which are derived by using the smoothing mean values of positive and negative vibration signal. Another is the spatial indicator, which is defined by fusing the multi-features extracted from the balance position information of vibration signal. During this process, a new data processing method proposed in this paper improves the quality of the vibration data and increases the number of samples. And then, the RUL prediction model is presented by combing the ST indicators and long-short-term memory network (LSTM) to establish the relationship between the ST indicators and the RUL of slewing bearings and overcome the sparsity of data. Moreover, in order to accelerate the adjustment of ST-LSTM model, a fine-tuning ST-LSTM model is further proposed by incorporating the generative adversarial networks (GAN) into the ST-LSTM. Experimental results verify that the proposed RUL prediction model can well estimate the RUL of slewing bearings and its performance is superior to some existing methods.

Automatic glass cup cracking-off machine

Abstract: The utility model discloses an automatic glass cup cracking-off machine. The device comprises a main turntable, a burst opening finger assembly, a burst opening fire ring assembly and a fire ring lifting cam assembly, the lower end of the main rotary disc is fixedly connected with a rotary supporting column, the lower end of the rotary supporting column is connected with a slewing bearing, a supporting disc is arranged at the lower end of the slewing bearing, the lower end of the supporting disc is fixedly connected with a second fixed stand column, and the bottom end of the second fixed standcolumn is fixedly connected with a chassis. A first fixed stand column penetrating to the slewing bearing is arranged in the main rotary disc, the first fixed stand column is fixedly connected with the supporting disc, and a first mounting disc is fixedly mounted at the top end of the first fixed stand column; and the fire ring lifting cam assembly is arranged on the chassis through a free guiderod. The full-automatic cup filling machine can achieve automatic cup filling, opening bursting and cup taking, full-automatic operation of equipment is achieved, traditional manual operation and machining are replaced, the machining quality is stable, the labor intensity is reduced, and the working efficiency is improved.

Creation of Calculation 3D Model of Slewing Bearing

Abstract: The article deals with the creation of 3D model of slewing bearing with the support of the 3D modeling software Creo Parametric 3.0 and with support of Apex Grizzly 16, that is especially suited for creation of a high-quality mesh on a variety of 2D or 3D models. The basic task will be, to define specific type of slewing bearing and find out the basic parameters, like ball diameter, diameter of inner and outer race, and pitch diameter of rolling tracks that are necessary for its construction. After we create suitable 3D model of slewing bearing, we need to divide the base model of ball into the several parts that will allow us to create a quality and uniform finite element mesh on the entire volume of the meshed part. After transforming the model into the program Apex Grizzly, we can create basic mesh and find optimal mesh values for each element of divided bearing separately.

Bearing auxiliary steering wheel system for heavy-load AGV transport vehicle and steering control method thereof

Abstract: The invention discloses a bearing auxiliary steering wheel system for a heavy-load AGV transport vehicle and a steering control method thereof The bearing auxiliary steering wheel system comprises asteering mounting plate, a slewing bearing mounted above the steering mounting plate, a bearing assembly, a limiting switch and a steering drive assembly, and the bearing assembly, the limiting switchand the steering drive assembly are mounted below the steering mounting plate; and each bearing auxiliary wheel is divided into an inner ring and an outer ring, and each inner ring and the corresponding outer ring can relatively rotate When the heavy-load AGV transport vehicle performs steering motion, a steering pinion in the steering drive assembly is driven by a steering drive motor and thenis engaged with the gear ring of an outer ring of the slewing bearing to drive the bearing assembly to synchronously rotate, and when the rotation reaches the limit angle position, the limiting switchstops the rotation through feedback control Compared with steering wheels for the heavy-load AGV transport vehicle, the bearing auxiliary steering wheels are small in space size, so that the space size of the heavy-load AGV transport vehicle is optimized, and meanwhile, the bearing auxiliary steering wheels realize fast and accurate steering control compared with common steering wheels without the steering drive assembly

Sub-surface stress analysis of slewing bearing ball based on plastic deformation

Abstract: Slewing support is widely used in large slewing machinery such as rocket launching platform, wind turbine and port crane. The accurate analysis of the internal stress in the raceway of ball roller is an important basis for studying the cause of bearing fatigue failure and improving the reliability of slewing support. In this paper, the finite element model of thrust angular contact rotary support was established in ANSYS. The stress distribution of the raceway of the ball under different working conditions was calculated by using bilinear isotropic plastic materials and linear elastic materials, and the equivalent stress resulted of the contact surface were compared with the Hertz contact model. This paper studied the factors that affect the distribution of the equivalent stress on the contact surface, calculates the ratio of the equivalent shear stress and the normal stress on the contact surface by finite element method, namely the equivalent friction coefficient, and studied the effect of the equivalent friction coefficient on the distribution of the stress inside the rolling ball. Simulation results show that plasticity occurs in the rolling ball.

Determination of permissible contact stress of case hardened raceway of roller slewing bearing.

Abstract: The permissible contact stress for the rolling bearing made of the through hardened bearing steel has been established based on experience, while there is no definite value or calculating formula o...

Slew bearing, method for using a slew bearing, hoisting crane and vessel

Abstract: The invention relates to a slew bearing (10, 107) comprising a stationary bearing ring (11) to be fixed to a base (3; 106), a moveable bearing ring (12) to be fixed to a moveable object (7; 102), wherein the stationary bearing ring and the moveable bearing ring are configured to enable rotation of the moveable bearing ring relative to the stationary bearing ring about a rotation axis (9). A main axial bearing (20) and an auxiliary bearing (60) are provided between the stationary bearing ring and the moveable bearing ring, wherein the moveable bearing ring comprises one or more main portions (13a) and one or more auxiliary portions (13b), which one or more main portions are moveable relative to the one or more auxiliary portions between an operational position, in which the main axial bearing transfers the axial loads between moveable bearing ring and stationary bearing ring, and a maintenance position, in which the auxiliary axial bearing transfers the axial loads between moveable bearing ring and stationary bearing ring and the main bearing is allowed to be inspected and/or maintained so that the slew bearing during inspection and/or maintenance is still operational.

Multifunctional machine for tamping railway ballast

Abstract: The invention discloses a multifunctional machine for tamping railway ballast. Caterpillar band walking mechanisms are installed on the two sides of a chassis and can advance/retreat along the rail, aslewing bearing mechanism is installed in the middle of the top face of the chassis, a rotating platform is installed above the slewing bearing mechanism, a cab and a drive control mechanism are bothinstalled above the rotating platform, and the drive control mechanism is installed behind the cab. A ballast tamping device is mounted at the front end of an operating arm mechanism through a hanging seat; the rear arm end of the operating arm mechanism is mounted on the front side of the top surface of the rotating platform and located on the side of the cab; the rotating platform can rotate by360 degrees through the slewing bearing mechanism, the cab, the drive control mechanism, the operating arm mechanism and the ballast tamping device can rotate synchronously with the rotating platform, and the whole machine runs on a rail track through a front guide frame and a rear guide frame. The multifunctional machine for tamping railway ballast has the characteristics of novel structure, high construction progress, low construction cost and high operation efficiency.

Rotary harmonic gear reducer

Abstract: A rotary harmonic gear reducer comprises an internal tooth type slewing bearing (1), a harmonic gear and a slewing support (8), and the internal tooth type slewing bearing (1) is composed of an outerring (1-2), an inner gear ring (1-1), steel balls and isolation blocks, and the steel balls and the isolation blocks are embedded between the outer ring (1-2) and the inner gear ring (1-1); the harmonic gear comprises a harmonic gear fixing flexible gear (2) and a harmonic gear generator; wherein the inner tooth type slewing bearing (1) and the slewing support (8) are sleeved on the harmonic gearfixing flexible gear (2), the inner tooth type slewing bearing (1) is meshed with outer teeth of the harmonic gear fixing flexible gear (2) through an inner gear ring (1-1), and the slewing support (8) is fixedly connected with an outer ring (1-2) of the inner tooth type slewing bearing (1). The speed reducer is high in transmission efficiency and stable in transmission.

Crane suitable for roadway hoisting

Abstract: The invention discloses a crane suitable for roadway hoisting. The crane comprises a getting-off part and a getting-on part, the getting-off part includes a frame, a base, a slewing bearing and the like, the getting-on part includes a duckbill-type cargo boom structure and the like, the lower part of the base is connected to the frame, the lower part is connected to a rotary table through the slewing bearing, the four corners of the base are provided with four support lugs, and the four support lugs are hinged to four landing legs. The frame is a steel structure frame, the rear part is connected with two rear wheels through an axle, and the front part is hinged to two front wheels; a tow bar is drawn out from an axle of the front wheels and is used for being connected with other vehicles,and the walking function of the crane is realized; one end of the duckbill-type cargo boom structure is hinged to the rotary table, and the other end is a free end so as to be used for lifting heavy objects, one end of a lifting cylinder is hinged to the rotary table, and the other end of the lifting cylinder is hinged to the duckbill-type cargo boom structure; and the rotary motor is installed atthe front end of the rotary table and is meshed with the slewing bearing, and lifting, jacking and turning functions of the crane can be realized. The crane solves the problem about heavy object lifting in a tunnel or a culvert.

Maintenance and repair agent for slewing bearing and preparation method thereof

Abstract: The invention discloses a maintenance and repair agent for a slewing bearing and a preparation method thereof. The maintenance and repair agent is prepared from ethylene glycol, calcium chloride, glycerol, sodium sulfite, hydrochloric acid, methylacrylic acid, aluminum polychlorid, calcium silicate, sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, sodium chloride, sodium molybdate, triethanolamine, hexamethylene tetramine, citric acid and oxirene. The maintenance and repair agent for the slewing bearing can efficiently repair the rusted slewing bearing, and greatly improves rust resistance, freezing resistance and corrosion resistance of the surface of the slewing bearing. Meanwhile, the preparation method for the maintenance and repair agent for the slewing bearing is simple andclear, is low in cost, and has extremely good practicability and economic benefits.

Mining hydraulic trackless self-moving equipment train

Abstract: The invention discloses a mining hydraulic trackless self-moving equipment train which comprises a plurality of train bodies connected together by connecting parts Each train body comprises two parallelly arranged tracks, a train bottom plate is arranged above the tracks, supporting plates capable of sliding on the tracks are separately arranged on the middle parts of the bottoms of two sides ofthe train bottom plate, two ends of the supporting plates are separately hinged to propelling oil cylinders, the stretching ends of each propelling oil cylinder are separately hinged to two ends of the tracks, a rotary bottom plate is arranged below the middle of the bottom of the train bottom plate, a slewing bearing is fixed to the rotary bottom plate, the top of the slewing bearing is fixed tothe train bottom plate, a plurality of uniformly distributed hydraulic jacks are arranged at the bottom of the rotary bottom plate, foot plates are fixed to the stretching ends of the hydraulic jacks,and ground spikes are arranged at the bottoms of the foot plates By matching the propelling oil cylinders, the slewing bearing and the hydraulic jacks, any train body of the equipment train can operate according to a regulated route When any train body deviates, the angle and the position coordinates of the train body can be independently adjusted

High-precision transmission rotary drive

Abstract: The utility model discloses a high-precision transmission slewing drive which comprises a shell, a transmission assembly and a slewing bearing assembly, the transmission assembly and the slewing bearing assembly are arranged on the shell, and the transmission assembly is perpendicular to the slewing bearing assembly. The transmission assembly comprises a worm; the slewing bearing assembly comprises a slewing bearing inner ring and a slewing bearing outer ring, and the slewing bearing inner ring is fixedly arranged on the shell; a plurality of needle bearings are mounted on the non-mounting surface of the slewing bearing outer ring at equal intervals along the circumference; the transmission assembly and the slewing bearing assembly are connected with the needle roller bearing in a meshed mode through a worm. The transmission mechanism is reasonable and simple in structural design, can effectively eliminate reverse clearance, improves transmission precision and efficiency, and prolongsservice life.

Differential steering wheel applied to AGV

Abstract: The utility model discloses a differential steering wheel applied to an AGV, and belongs to the technical field of AGVs. The differential mechanism comprises a slewing bearing assembly, a differentialwheel assembly, a pin shaft and a spring suspension device, the slewing bearing assembly is composed of a fixed outer ring, a slewing bearing, a rotating inner ring and a cover plate. The differential wheel assembly is composed of a support, a first wheel, a second wheel, a first driven chain wheel, a second driven chain wheel, a first motor, a second motor, a first driving chain wheel, a seconddriving chain wheel and a chain. One end of the support is movably fixed to one side in the rotating inner ring through a pin shaft, and the other end of the support is elastically connected with theother side in the rotating inner ring through a spring suspension device. The differential wheel assembly is fixed in the slewing bearing assembly, so that the differential wheel assembly has a damping effect, is higher in adaptability to uneven road surfaces, and is wider in application range; the whole damping suspension structure is fixed to the two ends of the differential wheel assembly, theoverall height of the differential steering wheel is not additionally increased, and the structure is more compact.

Novel slewing bearing clamping device

Abstract: The utility model discloses a novel slewing bearing clamping device which comprises a machining table, round grooves and screw holes are formed in the four ends of the table top of the machining table, supporting round tables are arranged in the round grooves, and each supporting round table comprises a T-shaped base plate, a table body, a positioning hole, an inclined groove and a rod hole. A clamping mechanism is further arranged on the supporting circular truncated cone and comprises an L-shaped rod, a U-shaped clamping plate, a U-shaped iron block and a strong magnet. And a handle is arranged outside the supporting circular truncated cone. According to the novel slewing bearing clamping device, clamping and fixing of a tool are achieved, compared with clamping and fixing modes such asa bolt clamp and the like, operation is more convenient and simpler, only the handle needs to be wrenched, and the novel slewing bearing clamping device has the advantages of being small in size, convenient to install, high in practicability, high in machining efficiency and the like.

Grooving device for building wall

Abstract: The utility model discloses a grooving device for a building wall. The device comprises a protection box, a plurality of lifting handles are fixed to the top face of the protection box, adjusting assemblies are fixed to the top face and the bottom face of the interior of the protection box, the bottoms of the adjusting assemblies extend out of the protection box, the bottom ends of the adjusting assemblies are fixedly connected with slotting assemblies, and locking assemblies used for locking the adjusting assemblies are horizontally fixed to the inner side wall of the protection box; the adjusting assembly comprises two bearing seats and a slewing bearing, and the bearing seats are fixed to the top face and the bottom face of the interior of the protection box respectively. Beneficial effects are that: the method is suitable for large-scale production; according to the grooving device, the grooving assembly is driven to move by lifting the lifting handle to groove the building wall body; and meanwhile, the grooving assembly can be driven by the supporting shaft to conduct grooving tangential conversion and locked by the locking assembly, the mode that a turnover device conducts grooving direction conversion is replaced, the posture in the lifting device process does not need to be changed, force application is facilitated, and operation is convenient.

Solar slewing bearing

Abstract: The utility model discloses a slewing bearing for solar energy. The bearing comprises an outer ring and an inner ring, a ball groove is formed in a gap between the outer ring and the inner ring; ballsare arranged in the ball grooves; an oil groove is formed in the outer ring; a supporting spring is arranged at the bottom of the inner wall of the oil groove; the oil groove is fixedly connected with a piston through a support spring; the piston is in close contact with the inner wall of the oil groove; a sealing cover is arranged at the top of the oil groove; a limiting frame is arranged in theouter ring, the inner wall of the limiting frame is fixedly connected with a compression spring, the limiting frame is fixedly connected with a limiting block through the compression spring, the sidewall of the limiting block is fixedly connected with an extrusion block, and the extrusion block is connected with the outer ring in a sliding mode. According to the slewing bearing for solar energy,the purposes of automatically supplementing lubricating oil, prolonging the service life of the slewing bearing, ensuring normal operation of work and meeting use requirements are achieved.

Compact articulated drilling machine suitable for outdoor drilling operations, but also and more specifically for excavation and perforation in small spaces, galleries and/or passages

Abstract: The invention is an articulated drilling machine (1) comprising a vehicle (11) able to move in at least one advance direction (X), a drilling member (2) and an assembly (8) suited to constrain and manoeuvre said drilling member (2) with respect to said vehicle (11). Said constraint and manoeuvre assembly (8) comprises a first horizontal slewing bearing (3) rotating around a vertical axis (Z), wherein said first slewing bearing (3) is in turn constrained to said vehicle (11) by means of at least one parallelogram kinematic mechanism (5) which enables the height of said first slewing bearing (3) to be varied between a minimum and a maximum height.

Flexible slewing bearing system based on tilting pad sliding bearing combined structure

Abstract: The invention relates to a flexible slewing bearing system based on a tilting pad sliding bearing combined structure. By applying a tilting pad structure with a sliding bearing with larger bearing capacity and modular design, the bearing direction of the bearing can be changed according to the change of the external load direction, the bearing is more suitable for dealing with a complex load impact scene with the randomly changed direction, and the problems that in the prior art, mechanical vibration is large, noise is large, mechanical failure is fast, and maintenance is difficult are solved.

Multi-degree-of-freedom rotary clamping claw clamping device based on cross sliding table

Abstract: The invention belongs to the technical field of intelligent robots, and particularly discloses a multi-degree-of-freedom rotary mechanical claw clamping device based on a cross sliding table. The multi-degree-of-freedom rotary mechanical claw clamping device based on the cross sliding table comprises the cross sliding platform, a slewing bearing mechanism, a double-vertical mechanical claw, a laser ranging module, an omni-directional moving chassis and a control component, wherein the laser ranging module is connected to the double-vertical mechanical claw, the double-vertical mechanical clawis connected to the slewing bearing mechanism, the slewing bearing mechanism is connected to the cross sliding platform, and the cross sliding platform is connected to the omni-directional moving chassis. According to the multi-degree-of-freedom rotary mechanical claw clamping device disclosed by the invention, goods such as goods on the shelf can be clamped at will, the clamping sensitivity and accuracy can be improved, and the maximum utilization rate of a clamping space is achieved.

Hoisting crane, slew bearing, slew bearing assembly method, slew bearing maintenance method and vessel

Abstract: A slew bearing including a stationary bearing ring to be fixed to a base, and a moveable bearing ring which is to be fixed to a moveable object and which is concentric with the stationary bearing ring, the stationary bearing ring and moveable bearing ring being configured to enable rotation of the moveable bearing ring relative to the stationary bearing ring, wherein the moveable bearing ring comprises a top ring member, a bottom ring member, and a middle ring member in between the top and bottom ring member, the top, middle and bottom ring members each being formed by a plurality of ring segments wherein vertical joints between ring segments of adjacent ring members are not aligned to each other, wherein the top, middle and bottom ring member comprise a plurality of holes distributed about the circumference of the moveable ring, respectively, wherein the top, middle and bottom ring member are connected to each other by a plurality of bolts received in the corresponding holes of the moveable ring member, and wherein at least one hole in the middle ring member and a corresponding hole in the top ring member and/or a corresponding hole in the bottom ring member are provided with a tubular alignment member having an outer diameter equal to the corresponding holes, an inner diameter allowing to receive a bolt, and a length large enough to extend from the middle ring member to the top ring member and/or the bottom ring member, respectively.

Revolving frame for work machine, and work machine provided with same

Abstract: Lifting performance of a work machine is increased while suppressing an increase in a vehicle weight. When a slewing frame (1) is seen from a side, a first reinforcement member (11) is provided from a boom foot section (5) to a front side part of a slewing bearing (22), a second reinforcement member (12) is provided from the boom foot section (5) to a mast foot section (6), and a third reinforcement member (13) is provided from the mast foot section (6) to a rear side part of the slewing bearing (22). Furthermore, a fourth reinforcement member (14) is provided from a middle region (M) located at an upper end portion of the slewing frame (1) and above a rear portion of the slewing bearing (22) to the front side part of the slewing bearing (22), and a fifth reinforcement member (15) is provided from the middle region (M) to the rear side part of the slewing bearing (22).

Line-marking tool

Abstract: The line-marking tool attaches to a pad of paper. The line-marking tool comprises an anchored straight edge, a rotating straight edge, and a slewing bearing. The slewing bearing attaches the rotating straight edge to the anchored straight edge. The anchored straight edge attaches to the pad of paper such that the position of the anchored straight edge relative to the top sheet of the pad of paper is fixed. The anchored straight edge and the rotating straight edge are used to draw straight lines on the top sheet. The slewing bearing adjusts the cant of the rotating straight edge relative to the anchored straight edge such that a cant is formed between a line drawn using the rotating straight edge and a line drawn using the anchored straight edge. The slewing bearing is calibrated to form a precise angle of cant on the top sheet.

Fixed-wing unmanned aerial vehicle friction disc energy dissipation rope hook recovery device

Abstract: The invention discloses a fixed-wing unmanned aerial vehicle friction disc energy dissipation rope hook recovery device, which comprises a friction supporting chassis, a swing rod support and a recovery rope assembly, wherein the friction supporting chassis comprises a chassis main body, a slewing bearing arranged in the middle of the chassis main body and a brake caliper arranged on the side portion of the slewing bearing; the swing rod support comprises a supporting arm assembly, a rotary main body connected with the slewing bearing and a friction disc matched with the brake caliper; the twoends of the recovery rope assembly are connected with the upper end and the lower end of the swing rod support respectively. According to the fixed-wing unmanned aerial vehicle friction disc energy consumption rope hook recovery device, the caliper disc type brake device is adopted to consume kinetic energy of an unmanned aerial vehicle, so that the recovery process of the unmanned aerial vehicleis controllable, and the requirement for the strength of wings of the unmanned aerial vehicle is lowered.

Finite Element Analysis of Slewing Bearings for Wind Turbines Using Spring Elements

Abstract: This study is about design and verification of stress reduction of bearings for wind turbines. In a slewing bearing having a typical four-contact structure, the contact point moves to the end of the raceway due to a large moment load, resulting in a stress concentration. A bearing was designed to reduce such contact point movement. The deformation behavior of typical ball bearings and newly designed bearings was calculated through finite element analysis under ultimate load by replacing the ball with a spring element. The contact stress between the ball and the raceway was calculated by finite element analysis by inputting the deformation behavior analysis result as a boundary condition. The effectiveness of the bearing stress analysis method using spring elements was verified through comparison of the contact stress according to the bearing structure.

On-line digital detection and feedback automatic correction device and method for out of roundness of PE pipe

Abstract: The invention provides an on-line digital detection and feedback automatic correction device and method for the out of roundness of a PE pipe. The on-line digital detection and feedback automatic correction device comprises a servo correction part arranged at the front end of a cooling section of the PE pipe and a laser detection part arranged at the rear end of the cooling section of the PE pipe;the laser detection part comprises a first servo motor; an output shaft of the first servo motor is connected with a first driving gear; the first driving gear is engaged with a toothed outer ring ofa first slewing bearing; a laser sensor is arranged on the toothed outer ring of the first slewing bearing; an output shaft of a second servo motor is connected with a second driving gear; the seconddriving gear is engaged with a toothed outer ring of a second slewing bearing; a correcting mechanism assembly comprises a third servo motor and sliding blocks positioned on two sides of the third servo motor; the third servo motor and the sliding blocks are mounted on the toothed outer ring of the second slewing bearing; a roller frame is fixedly mounted on a sliding rail, and is connected witha screw rod through a nut; the screw rod is connected with an output shaft of the third servo motor; and a tapered roller is mounted on the roller frame. The on-line digital detection and feedback automatic correction device and method can detect the out of roundness of a finished PE plastic pipe in a real-time manner, can perform on-line correction and adjustment on the out of roundness of the PEpipe, and enables the error of the out of roundness of the PE pipe to be corrected to the allowable range.

Stop-motion animation shooting device

Abstract: The utility model belongs to the technical field of shooting devices. The utility model relates to a shooting device, in particular to a stop-motion animation shooting device. The device comprises a bottom plate, a first slewing bearing and a second slewing bearing, a first supporting plate is arranged above the bottom plate; a through hole is formed in the plate surface of the first supporting plate; a first electric push rod is arranged between the bottom plate and the first supporting plate; the bottom of the inner ring of the first slewing bearing is fixedly connected with the first supporting plate; a first driving mechanism is arranged on the first supporting plate; a shooting table is fixedly connected to the upper part of the outer ring of the first slewing bearing; a through holeis formed in the surface of the shooting table; a plurality of camera mounting plates are arranged on the shooting table; a couple unfolding table is arranged at the through holes of the first supporting plate and the shooting table, the couple unfolding table is fixedly connected with the upper part of the outer ring of the second slewing bearing, a second supporting plate is fixedly connected with the bottom of the inner ring of the second slewing bearing, a second driving mechanism is arranged on the second supporting plate, and a second electric push rod is arranged on the bottom plate.