Showing papers on "Slewing bearing published in 2017"
27 Sep 2017
TL;DR: In this paper, an empirical study of feature extraction methods for the application of low-speed bearing condition monitoring is presented, where the selected features such as impulse factor, margin factor, approximate entropy and largest Lyapunov exponent (LLE) show obvious changes in bearing condition from normal condition to final failure.
Abstract: This paper presents an empirical study of feature extraction methods for the application of low-speed slew bearing condition monitoring. The aim of the study is to find the proper features that represent the degradation condition of slew bearing rotating at very low speed (≈ 1 r/min) with naturally defect. The literature study of existing research, related to feature extraction methods or algorithms in a wide range of applications such as vibration analysis, time series analysis and bio-medical signal processing, is discussed. Some features are applied in vibration slew bearing data acquired from laboratory tests. The selected features such as impulse factor, margin factor, approximate entropy and largest Lyapunov exponent (LLE) show obvious changes in bearing condition from normal condition to final failure.
301 citations
TL;DR: In this paper, a novel diagnosis scheme based on envelope analysis and wavelet de-noising with sigmoid function based thresholding is used to extract the fault related symptoms from noisy vibration signatures of defective ball bearings operating at slow speed.
91 citations
TL;DR: In this article, a procedure for the determination of the interferences between balls and raceways in four contact point slewing bearings due to manufacturing errors is presented, and finite element analyses are performed for the friction torque calculation, considering different preloads.
24 citations
04 Apr 2017
TL;DR: In this article, multivariate state estimation technique (MSET), sequential probability ratio test (SPRT) and kernel regression was combined for low speed slew bearing condition monitoring and prognosis, and the application of the method is demonstrated with laboratory slew bearing acceleration data.
Abstract: This paper presents an application of multivariate state estimation technique (MSET), sequential probability ratio test (SPRT) and kernel regression for low speed slew bearing condition monitoring and prognosis. The method is applied in two steps. Step (1) is the detection of the incipient slew bearing defect. In this step, combined MSET and SPRT is used with circular-domain kurtosis, time-domain kurtosis, wavelet decomposition (WD) kurtosis, empirical mode decomposition (EMD) kurtosis and the largest Lyapunov exponent (LLE) feature. Step (2) is the prediction of the selected features’ trends and the estimation of the remaining useful life (RUL) of the slew bearing. In this step, kernel regression is used with time-domain kurtosis, WD kurtosis and the LLE feature. The application of the method is demonstrated with laboratory slew bearing acceleration data.
23 citations
TL;DR: In this article, two models for the friction torque calculation are compared: a Finite Element model and the analytical model proposed by Leblanc and Nelias, which assumes that full sliding occurs in the ball-raceway contact, which is demonstrated to be an appropriate simplification for many cases, but not for applications where large tilting moments are involved.
20 citations
TL;DR: In this paper, the authors provide a state-of-the-art review on methods for condition monitoring and fault diagnosis of low-speed and heavy-load slewing bearings, including methods based on vibration analysis, acoustic emission technique, oil condition and temperature variation.
Abstract: Low-speed and heavy-load slewing bearings are applied broadly for major mechanical equipment. Compared with ordinary bearings, large slewing bearings have complex structures and work in variable environments. In order to increase productivity, reduce maintenance costs, and ensure the safety of people and equipment, it is of great importance to monitor and diagnose faults in real time. This paper aims at providing a state-of-the-art review on methods for condition monitoring and fault diagnosis of low-speed and heavy-load slewing bearings, including methods based on vibration analysis, acoustic emission technique, oil condition and temperature variation. Additionally, this paper discusses advantages and disadvantages of different methods. Finally, the current needs and challenges are presented to provide a reference for future research.
15 citations
TL;DR: In this paper, a data fusion method was proposed to achieve online residual useful life prediction of slewing bearings, which consisted of a reliability based RUL prediction model and a data driven failure rate (FR) estimation model.
Abstract: To decrease breakdown time and improve machine operation reliability, accurate residual useful life (RUL) prediction has been playing a critical role in condition based monitoring. A data fusion method was proposed to achieve online RUL prediction of slewing bearings, which consisted of a reliability based RUL prediction model and a data driven failure rate (FR) estimation model. Firstly, an RUL prediction model was developed based on modified Weibull distribution to build the relationship between RUL and FR. Secondly, principal component analysis (PCA) was introduced to process multi-dimensional life-cycle vibration signals, and continuous squared prediction error (CSPE) and its time-domain features were employed as equipment performance degradation features. Afterwards, an FR estimation model was established on basis of the degradation features and relevant FRs using simplified fuzzy adaptive resonance theory map (SFAM) neural network. Consequently, real-time FR of equipment can be obtained through FR estimation model, and then accurate RUL can be calculated through the RUL prediction model. Results of a slewing bearing life test show that CSPE is an effective indicator of performance degradation process of slewing bearings, and that by combining actual load condition and real-time monitored data, the calculation time is reduced by 87.3% and the accuracy is increased by 0.11%, which provides a potential for online RUL prediction of slewing bearings and other various machineries.
12 citations
10 Jul 2017
TL;DR: A state-of-the-art review on methods for condition monitoring and fault diagnosis of low-speed and heavy-load slewing bearings, including methods based on vibration, stress and strain, the condition of oil or grease and temperature variation is provided.
Abstract: Low-speed and heavy-load slewing bearings are applied broadly for major mechanical equipment. Compared with ordinary bearings, large slewing bearings have complex structures and work in variable environments. In order to increase productivity, reduce maintenance costs, and ensure the safety of people and equipment, it is of great importance to monitor and diagnose faults in real time. This paper aims at providing a state-of-the-art review on methods for condition monitoring and fault diagnosis of low-speed and heavy-load slewing bearings, including methods based on vibration, stress and strain, the condition of oil or grease and temperature variation. Additionally, this paper discusses advantages and disadvantages of different methods. Finally, the current focuses and challenges are presented to provide a reference for future research.
11 citations
21 Apr 2017
TL;DR: The results show that a group of parallel springs can be used to replace the solid roller and simulate the line contact performance between the roller and raceway, but an equivalent nonlinear spring is not recommended because of the low computational accuracy.
Abstract: In order to improve the computational efficiency of load distribution of large three-row roller slewing bearing, a new computational model using nonlinear springs is presented in this paper. In thi...
10 citations
TL;DR: The wire-race bearing as discussed by the authors is a kind of slewing bearing in which a wire plays the role of raceway, and there are two contact pairs: ball-wire and wire-ring.
Abstract: The wire-race slewing bearing is a kind of slewing bearing in which a wire plays the role of raceway. The rings can be made of light metals, like aluminum or new materials, like composites. These bearings can be used in applications where lightweight and inertia are important, such as aircraft, robotics and medical aperture [1]. Wire-race slewing bearing are also backlash-free. Another advantage are replaceable raceways, thanks to which the maintenance of big machines (like excavators) is much easier. In these bearings, there are two contact pairs: ball-wire andwire-ring. The ballwire contact pair is an example of a Hertz contact with elliptical contact surface. The wire-ring contact is a classic contact, with larger contact area. Due to the lack of literature on these kinds of bearings, the design rules for wire bearings are not properly defined. The future expectations for these kinds of bearings are: further reduction of weight, by using composites material, and improvement of reliability. An example of a cross section of wire-race slewing bearing is presented below (Fig. 1). In the wire-race bearing, the load is usually carried from external components through balls or rollers and wires in four contact points to the ring and the rest of structure. The estimation of the rings deformations is crucial in predicting
9 citations
01 Sep 2017
TL;DR: In this article, a mixed finite element model with both solid elements and spring elements of a three-row roller bearing assembly was proposed to check the bearing structural strength by using the maximum internal stress of the bearing rings.
Abstract: For the two failure modes of a three-row roller slewing bearing, ring fracture and raceway spalling, a method for checking the strength of a slewing bearing through finite element analysis is proposed. This method calculates the internal stress distribution of the bearing rings by using the mixed finite element model with both solid elements and spring elements of the slewing bearing assembly and checks the bearing structural strength by using the maximum internal stress of the bearing rings. The method also calculates the contact stress between the roller and raceways by using the entity contact model between the roller and the raceways; the obtained maximum contact stress is used to check the contact strength of the slewing bearing. The proposed mixed finite element model considers the structural deformation of the bearing rings, and the calculated results can reflect the real situation more accurately than the traditional analytical model with the hypothesis of rigid ring. The proposed method also avoi...
01 Jun 2017
TL;DR: In this article, four finite element models of a slewing bearing with different supporting structures are established by the finite element software ANSYS. In these models, the ball-race contact is simplified by th...
Abstract: Four finite element models of a slewing bearing with different supporting structures are established by the finite element software ANSYS. In these models, the ball–race contact is simplified by th...
01 Jan 2017
TL;DR: In this article, a procedure for the determination of the interferences between balls and raceways in four-contact-point slewing bearings due to manufacturing errors is proposed and applied to a particular case and finite element analyses are performed for the friction moment calculation, considering different preloads.
Abstract: This work proposes a procedure for the determination of the interferences between balls and raceways in four-contact-point slewing bearings due to manufacturing errors. The procedure is applied to a particular case and finite element analyses are performed for the friction moment calculation, considering different preloads. The results are used to evaluate the influence of manufacturing errors in the friction torque of the bearing.
TL;DR: In this paper, the retainer force was considered for satisfying the force equilibrium of the balls because the contact forces from two raceways are not on the same plane, and there is no reaction moment for each raceway in the axial direction, so each raceways freely rotates about each axial axis.
Abstract: This paper studied the load distribution for one-row slewing ball bearing. The contact force between the balls and raceways is calculated based on Hertz contact theory. The retainer force was considered for satisfying the force equilibrium of the balls because the contact forces from two raceways are not on the same plane. Also, there is no reaction moment for each raceway in the axial direction, so each raceway freely rotates about each axial axis. The direction of relative displacement of the two raceways is shown to differ from the direction of combined loads due to contact geometric nonlinearity of the slewing bearing. The retainer reduces the number of contact balls in the slewing bearing, so the maximum contact load increases compared to when the retainer is not considered.
Patent•
29 Aug 2017
TL;DR: The steel ladle full-course covering and uncovering device has low requirements for clearance above a steamer and is low in equipment failure rate, small in maintenance quantity and smooth in production as discussed by the authors.
Abstract: The invention provides a steel ladle full-course covering and uncovering device and a molten steel carrying device. The steel ladle full-course covering and uncovering device comprises a fixed stand column, a lifting hydraulic cylinder, a lifting stand column, a rotation driving motor, a slewing bearing, a rotary frame, a transverse moving hydraulic cylinder and a transverse moving trolley. The fixed stand column is fixed on a platform; the lifting stand column is connected onto the fixed stand column in a sleeving manner; the lifting hydraulic cylinder drives the lifting stand column to go up and down along the fixed stand column; the rotary frame comprises a vertical rod and a horizontal rod connected with the vertical rod; the bottom of the vertical rod and the top of the lifting stand column are connected through the slewing bearing; the rotation driving motor is fixed on the lifting stand column and drives the slewing bearing to rotate so as to drive the rotary frame to rotate; the transverse moving trolley is positioned on the horizontal rod; and the transverse moving hydraulic cylinder drives the transverse moving trolley to move along the horizontal rod. The steel ladle full-course covering and uncovering device has low requirements for clearance above a steel ladle, is free of impact during covering and uncovering, and is low in equipment failure rate, small in maintenance quantity and smooth in production.
Patent•
15 Feb 2017
TL;DR: In this paper, a multifunctional arching drill jambo consisting of a main machine platform, two supporting legs and two parallel mechanical arm racks with quick-dismounting baskets is presented.
Abstract: A multifunctional arching drill jambo comprises a main machine platform (6). The bottom of the main machine platform is provided with a chassis (8); the two sides of the main machine platform are provided with supporting legs (9); the front portion of the main machine platform is provided with a truck with crane (7) through a slewing bearing; the rear portion of the main machine platform is provided with two parallel mechanical arm racks (3) with mechanical arms (1) and a drill arm rack (5) with a rock drill system (4); the drill arm rack is arranged between the two mechanical arm racks; and the mechanical arms (1) and the rock drill system (4) are provided with quick-dismounting baskets (2). According to the multifunctional arching drill jambo, arch construction can be conducted while three kinds of steps of a tunnel are excavated, all the construction procedures of arch butt joint, bar-mat reinforcement hanging, cross rib welding, anchor rod installation and advance small pipe support can be achieved, and the efficiency of the multifunctional arching drill jambo is far higher than that of manpower.
Patent•
22 Sep 2017
TL;DR: In this article, an electronic watch watchband automatic drilling and punching machine, which comprises four same impact cylinders, which are mounted on a large rotation disc, is presented, where the top surface of an inner ring of a first slewing bearing makes contact with the bottom surface of the large rotation disk, and the bottom surfaces of an outer ring thereof is connected with the top surfaces of a support column.
Abstract: The invention discloses an electronic watch watchband automatic drilling and punching machine, which comprises four same impact cylinders, which are mounted on a large rotation disc. The large rotation disc is also provided with a first servo motor, which is connected with a first gear shaft. The top surface of an inner ring of a first slewing bearing makes contact with the bottom surface of the large rotation disc, and the bottom surface of an outer ring thereof is connected with the top surface of a support column. A support base is arranged under the support column. The left and right sides on the upper surface of the support base are respectively provided with a counter bore, which is equipped with a second slewing bearing and a second servo motor. Each second slewing bearing is provided with a second rotation disc, and four slide bases are arranged on the second rotation disc. Stations of the four impact cylinders can be changed, so that tools do not need to be replaced each time; during watchband processing, watchbands can be dismounted and mounted on other slide bases, thereby saving time; two watchbands can be processed each time, thereby increasing production; and the automatic drilling and punching machine can realize hole drilling and punching, has two processing modes, ensures watchband hole interval and linearity and improves watchband hole processing quality.
Patent•
29 Mar 2017
TL;DR: In this article, a five degree of freedom track ship with three degrees of freedom swing ships is described. And the bottom of cabin is provided with a three degree swing machine and a frame with an actuating mechanism, and the inside of cabin with a slewing bearing.
Abstract: The utility model discloses a five degree of freedom track ships, including the cabin, tight pulley group is pressed from both sides to the direction, the track system, the frame, actuating mechanism, three degree of freedom swing machine construct, circular track, the rack, rotary reducing motor, crank and rocker mechanism, the galianconism, big arm, the upper mounting plate, the driving gear, wheel bridge and slewing bearing, the bottom of cabin is provided with three degree of freedom swing machine and constructs, the bottom that three degree of freedom swing machine construct is provided with the frame, the bottom of frame is provided with actuating mechanism, actuating mechanism's both sides are provided with the direction and press from both sides tight pulley group, the inboard that tight pulley group was pressed from both sides to the direction is provided with the track system, the rack is located the orbital centre of two root circles shape, three degree of freedom swing machine construct including rotary reducing motor, the upper mounting plate, crank and rocker mechanism, galianconism and big arm, the inside of cabin is provided with slewing bearing, the bottom of frame is provided with rotary reducing motor, one side of rotary reducing motor is provided with the driving gear, the bridge is had to the intermediate junction of direction clamp tight pulley group.
Patent•
04 Jan 2017
TL;DR: In this article, an explosion-proof electronic spiral arm hangs, including stand and vertical xarm, is equipped with major diameter slewing bearing's platform at the top of stand, equipped with on the platform and rotates box and horizontal swing drives device, horizontal swing drive device includes brake motor and planet gear speed reducer.
Abstract: The utility model provides an explosion -proof electronic spiral arm hangs, includes stand and vertical xarm, is equipped with major diameter slewing bearing's platform at the top of stand, is equipped with on the platform and rotates box and horizontal swing drives device, horizontal swing drives device includes brake motor and planet gear speed reducer, major diameter slewing bearing platform is equipped with outer ring gear, be equipped with on planet gear speed reducer's the output shaft with the outer ring gear complex drive gear of the aforesaid, vertical xarm with rotate that the box is fixed to meet, be equipped with the I -steel track in the lower part of vertical xarm, be equipped with electric block running gear on the I -steel track, be equipped with horizontal spacing alarm device between vertical xarm and stand, be equipped with vertical spacing buffer at the outer tip of I -steel track, be close to and be equipped with vertical spacing alarm device, the last warning contact that corresponds the setting with vertical spacing alarm device that is equipped with of electric block running gear on vertical xarm of vertical spacing buffer. The structure is simpler, and practicality, adaptability, security more strong stability are higher.
07 Apr 2017
TL;DR: With the difficulties of slewing bearing's residual life prediction, a new method of support vector regression (SVR) life prediction model is proposed and the algorithms for optimizing the SVR internal parameters are analyzed and researched to improve the accuracy of SVR model.
Abstract: In this paper, with the difficulties of slewing bearing's residual life prediction, a new method of support vector regression (SVR) life prediction model is proposed. In order to improve the accuracy of SVR model, the algorithms for optimizing the SVR internal parameters are analyzed and researched. Binding assay, the effectiveness and stability of the SVR prediction model optimized respectively by Gridding Optimization Algorithm (GOA), Genetic Algorithm (GA) and Particle Swarm Optimization (PSO) are analyzed according to the different input signal, which verifies the superiority of PSO. Finally, the SVR prediction model optimized by PSO is used to predict the remaining life of slewing ring, which is compared with its actual life to demonstrate the effectiveness of the SVR prediction model optimized by PSO on slewing bearing life prediction.
Patent•
05 Dec 2017
TL;DR: In this article, a utility model discloses a high accuracy slewing bearing device that oils relates to machinery, including base, crane, base, dextrorotation lead screw, levogyration lead screw and clamp splice and motor.
Abstract: The utility model discloses a high accuracy slewing bearing device that oils relates to machinery, including base, slewing bearing, crane, base, dextrorotation lead screw, levogyration lead screw, clamp splice and motor, slewing bearing fixes the outer lane on the base, circle in the slewing bearing to be connected with the base, be equipped with centering structure on the clamp splice, the crane has cup jointed an oil -out slider, oil -out slider below is equipped with the oil -out, be equipped with crane location slider on the riser guide, be equipped with crane set nut on the slider of crane location, fix a position the slider through the crane, fix the oil -out in the specified altitude assignment, be equipped with the scale on the crane for the oil -out can be fixed in the appointed position of producing oil, and right rear drive motor drives drive gear, drives inner ring of the slewing bearing steady rotation again, thereby drives and wait the work piece steady rotation that oils, and the oil -out evenly produces oil simultaneously, and evenly the high accuracy oils for the slewing bearing work piece.
Patent•
04 Jan 2017
TL;DR: In this paper, an automatic pickup type forage crushing robot consisting of a pedestal, an extrusion function module, a crushing function module and a rotary motor is presented. But the robot is not suitable for the task of milling.
Abstract: An automatic pickup type forage crushing robot comprises a pedestal, an extrusion function module, a crushing function module, a rotary motor, a pickup function module, a slewing bearing and a gear, and is characterized in that a square hole is formed in the left side of a desktop of the pedestal and a mounting round hole is formed in the right side of the desktop of the pedestal; the extrusion function module is placed in the modes that a hopper opens upwards and a partition plate stretches rightwards; the extrusion function module is fixedly arranged below the square hole in the left side of the pedestal; the crushing function module is placed in the mode that a round mouth faces upwards, and is fixedly arranged above the square hole in the left side of the pedestal; the slewing bearing is fixedly arranged at the position of the mounting round hole in the right side of the pedestal; involute gear teeth are processed on the outer side of the slewing bearing; the pickup function module is fixedly arranged on the slewing bearing through a base of the pickup function module. The automatic pickup type forage crushing robot has the following advantages: a crushing process and a process of extruding into block are integrated, so that the labor is greatly reduced and the efficiency is improved; a multifunctional crushing cutter can crush forge as far as possible, so that subsequent processing is facilitated; forge is process into forge blocks, so that storage and further processing are facilitated.
Patent•
17 Oct 2017
TL;DR: In this paper, the utility model relates to a flexible concrete spreader, which can increase the lifting surface area of bottom, increase firmly, safe in utilization, stable in structure, and have high efficiency, energy-conservation, economy, practical characteristics.
Abstract: The utility model discloses a flexible concrete spreader, including the grudging post, the inside of grudging post is provided with the riser, and the bottom of grudging post is provided with the support base, and the outside side that supports the base is provided with a plurality of telescopic leg, and telescopic leg's one end is provided with fixed bolt, and the top of grudging post is provided with slewing bearing, and slewing bearing's top is provided with hydraulic elevating platform, and hydraulic elevating platform's top is provided with the bearing support frame, is provided with the telescopic link on the preceding horizontal pole, and the one side of going up the horizontal pole is provided with the stay cord seat, is provided with the stay cord wheel on the stay cord seat. The utility model relates to a flexible concrete spreader, can be effectual the work efficiency of improvement cloth machine, enlarged the concrete pumping scope, strengthened concrete spreader's convenience, also can improve the stability in the middle of the working process simultaneously, increase the lifting surface area of bottom, increase firmly, safe in utilization, stable in structure is reliable, the complete machine is easy and simple to handle, the rotation is nimble, has high efficiency, energy -conservation, economy, practical characteristics.
Patent•
10 May 2017
TL;DR: In this paper, an electronic heavy hoist of frequency conversion relates to the hoist field, and it includes the base of being connected through slewing bearing and rotating platform, rotation mechanism passes through gear drive and drives the rotating platform rotation, span winch who installs on rotating platform rises the winch and is controlled by the frequency conversion drive control system who installs in the electrical control room with lead.
Abstract: The utility model discloses an electronic heavy hoist of frequency conversion relates to the hoist field, and it includes the base of being connected through slewing bearing and rotating platform, rotation mechanism passes through gear drive with slewing bearing and drives the rotating platform rotation, the span winch who installs on rotating platform rises the winch and is controlled by the frequency conversion drive control system who installs in the electrical control room with lead, the root of tripod, davit is all articulated with rotating platform, the head of davit, tripod upper portion are all installed and are become width of cloth pulley and main hook pulley, top ping lift is connected the davit through becoming width of cloth pulley with tripod and span winch, main hook wire rope rises the main hook coaster winch and is connected with lead through the main hook pulley, rises receiving and releasing of winch and restricts and move through having led, the lift of realization main hook coaster. The utility model discloses can solve that traditional heavy hoist lifts by crane that the goods stationarity is poor, accurate not high, the combustion gas of control or the hydraulic oil that spills causes the marine environment high problem of polluting and consume energy easily.
Patent•
26 Apr 2017
TL;DR: In this article, a rotator is used for space flight conduit head and particle therapeutic instrument, its characterized in that, it is rotatory by foretell drive mechanism drive rotator, rotary power base and the rotatory bracket base in back before both ends are equipped with respectively around the rotator.
Abstract: The utility model provides a drive mechanism, a serial communication port, establishing the slewing bearing on the rotator including the cover, losing no time intrinsic pin wheel in slewing bearing's outer lane, two at least gears form pin tooth transmission with the round pin gear mesh of pin wheel, and the gear binds with zero back clearance speed reducer mutually, zero back clearance speed reducer with two by have the drive of two servo motor disappear the crack technique numerical control system control to exchange servo motor's output shaft directly continuous. The utility model discloses an another technical scheme provides a rotatory frame that is used for space flight conduit head and particle therapeutic instrument, including the rotator, its characterized in that, it is rotatory by foretell drive mechanism drive rotator, rotary power base and the rotatory bracket base in back before both ends are equipped with respectively around the rotator. The utility model discloses a rotatory frame adopts the big bearing roller of round to form the bearing frame that supports rotatory frame, and engaging teeth wheel or round pin tooth do not have slippage drive and location, also is simultaneously to lean on gear or round pin tooth not to have the slippage according to certain velocity ratio to obtain rotatory angle value.
01 Jan 2017
TL;DR: In this paper, a theoretical foundation for the fault diagnosis of a crane slewing bearing working at low speed and heavy duty was provided by using the distribution law of wavelet energy spectrum coefficients under different working conditions.
Abstract: By use of the custom-built crane model, loads, acoustic emission instrument, and sensor, AE tests for the slewing bearing with no defect, the slewing bearing with outer race defect, and the slewing bearing with roller defect had been conducted under the operating conditions of low speed and heavy duty. A lot of AE signals had been acquired and processed. AE signal acquired under different working conditions had made wavelet decomposition using Daubechies wavelet. All wavelet energy spectrum coefficients under every working condition had been calculated. The judgment basis for the slewing bearing fault had been obtained by the distribution law of wavelet energy spectrum coefficients under different working conditions. This study lays a theoretical foundation for the fault diagnosis of crane slewing bearing working at low speed and heavy duty.
Patent•
04 Jan 2017
TL;DR: In this article, the steering mechanism of a fully-revolving propeller is described, consisting of a power unit, a planet reduction gearbox and a slewing bearing.
Abstract: The invention discloses a steering mechanism of a fully-revolving propeller and belongs to the technical field of propellers. The steering mechanism comprises a power unit, a planet reduction gearbox and a slewing bearing, wherein the output end of the power unit is in transmission connection with the input end of the planet reduction gearbox, the output end of the planet reduction gearbox is in transmission connection with the slewing bearing, a torsion limiter and an inductive switch are arranged between the output end of the power unit and the input end of the planet reduction gearbox, the torsion limiter is in transmission connection with the output end of the power unit and the input end of the planet reduction gearbox, and the inductive switch is electrically connected with the power unit. When the torsion limiter is overloaded and slips, transmission connection between the power unit and the planet reduction gearbox is broken, the inductive switch outputs an electric signal to the power unit, and the power unit is controlled to slow down.
Patent•
12 Dec 2017
TL;DR: In this paper, a multistation mortar formula medicinal material stamp pestle machine, its electrical control part presets the relay including electric cabinet and a plurality of station control dish, digital display motor calculator, the mechanical control part includes speed reducer, slewing bearing, rod end joint bearing, straight line axle, and a plethora of stamp parym equipment.
Abstract: The utility model discloses a multistation mortar formula medicinal material stamp pestle machine, its electrical control part presets the relay including electric cabinet and a plurality of station control dish, digital display motor calculator, the mechanical control part includes speed reducer, slewing bearing, rod end joint bearing, straight line axle and a plurality of stamp pestle equipment, and slewing bearing sets up at the center of annular workstation, and the speed reducer is connected with the decentered inner circle of slewing bearing, every stamp pestle equipment all passes through the straight line axle and rod end joint bearing is connected with slewing bearing, rod end joint bearing's one end is passed through the pivot and is connected with the rod end joint bearing seat that sets up on slewing bearing, and its other end passes through the pivot to be connected with the buffing pad, buffing pad and sharp hub connection, and the straight line axle links to each other with stamp pestle equipment through linear bearing, and sharp be linear motion under linear bearing's protection, and then drives stamp pestle equipment and pound medicine in a mortar. The fine hair rate of carrying of this patent folium artemistae argyi is high, has improved the value of chinese -medicinal material in great degree.
Patent•
08 Dec 2017
TL;DR: In this paper, a bearing extension portion which is connected with an outer ring in a fastening mode is arranged on the outer ring of the slewing ring bearing, and the deformation quantity of the ring bearing is determined according to the acquired displacement data.
Abstract: The invention provides a state monitoring method and device of a slewing ring bearing and a wind turbine generator system. A bearing extension portion which is connected with an outer ring in a fastening mode is arranged on the outer ring of the slewing ring bearing. The method comprises the steps that displacement data at the test position of the bearing extension portion are acquired; the deformation quantity of the slewing ring bearing is determined according to the acquired displacement data; and the loss state of the slewing ring bearing is determined according to the deformation quantity. By the adoption of the technical scheme, the deformation quantity of the slewing ring bearing can be enlarged through the bearing extension portion, and then effective monitoring can be conveniently conducted on the damage of the slewing ring bearing.