Showing papers on "Slewing bearing published in 2010"
TL;DR: In this paper, the geometry and manufacturing procedures of large rolling slewing bearings are compared with those of standard rolling bearings, and a comparison of the results is made at the end.
38 citations
TL;DR: In this article, the authors proposed a nonlinear elastic model for the load distribution of a four contact-point slewing bearing considering the effect of the structure's elasticity on the increase in contact forces.
Abstract: This paper proposes a procedure,for obtaining the load distribution in a four contact-point slewing bearing considering the effect of the structure's elasticity. The uneven stiffness of the rings and the supporting structures creates a variation with respect to the results obtained with a rigid model. It is necessary to evaluate the effect of the elasticity on the increase in the contact forces in order to be able to design the slewing bearing and the structures involved in the connection. Depending on the shape of the structures, the contact force value obtained on the most loaded rolling element is different. The evaluation of this maximum force at extreme loads is essential to design the structures joined to the bearing rings. The new elastic model presented in this paper is highly nonlinear so iterative loops are needed in order to obtain a satisfactory solution. At the same time a finite element model (FEM) has been created for the global model, having also represented the rolling elements and their contact with the raceways. The results obtained using the FEM have been correlated with the results of the new procedure.
35 citations
TL;DR: In this article, a general static load-carrying capacity of four-contact-point slewing bearings under axial, radial, and tilting-moment loads is presented.
Abstract: This paper presents a calculation of the general static load-carrying capacity of four-contact-point slewing bearings under axial, radial, and tilting-moment loads. This calculation is based on a generalization of Sjovall and Rumbarger’s equations and provides an acceptance surface in the load space. This acceptance surface provides a solid basis to compute acceptance curves for the design and selection of bearings of this kind.
32 citations
TL;DR: In this article, the carrying capability and the service life of a four-point contact bearing are influenced significantly by its raceway geometry parameters, such as cross section clearance, ratio of curvatures, rolling ball diameter, and initial contact angle.
Abstract: The carrying capability and the service life of a four-point-contact slewing bearing are influenced significantly by its raceway geometry parameters. In this paper, the carrying capability is characterized by the maximal contact stress in the paper. The usual industry practice is to specify the service life as the L10 life. The geometry parameters, cross section clearance, ratio of curvatures, rolling ball diameter, and initial contact angle, are also considered. The sensitivity of each parameter influencing the carrying capability and the service life is discussed as well. The results show an interesting phenomenon, indicating that the maximal contact load and the maximal stress do not always have the same varying trend when discussed parameters vary. The developed design can be utilized as a reference for an optimal slewing bearing design. If a slewing bearing of high static carrying capability is required, it can be designed with large ratio of curvatures and rolling ball diameter. In terms of service life, the cross section clearance and the initial contact load should also be considered.
21 citations
TL;DR: In this article, the experimental determination of fatigue crack growth parameters for high strength low-alloy steel 42CrMo4 was performed according to ASTM E647 standard and the parameters of the Paris equation (C and m) were determined.
17 citations
Patent•
[...]
24 Nov 2010
TL;DR: In this paper, a sun tracking device, including installation box, elevating angle twin worm slewing bearing and azimuth twin worm stewing bearing, is integrated in a module, making on-the-spot simple to operate swift.
Abstract: The utility model discloses a sun tracking device, including installation box, elevating angle twin worm slewing bearing and azimuth twin worm slewing bearing the internal elevating angle transmission shaft that is provided with of install bin, elevating angle transmission shaft one end is passed the installation box and is connected the back with the slewing bearing inner circle in the elevating angle twin worm slewing bearing, is connected with high power spotlight solar PV modules simultaneously, and its other end passes the installation box to be connected with elevating angle flange, elevating angle flange and high power spotlight solar PV modules are connected, elevating angle twin worm slewing bearing's casing and installation box fixed connection, installation box lower part is passed through azimuth twin worm slewing bearing and is connected with the support post. The utility model discloses twin worm transmission structure is all adopted in elevating angle and bearing tracking, ensured life phase tracking accuracy within 0.5 degree, simultaneously twin worm slewing bearing etc. Is all integrated in a module, makes on -the -spot simple to operate swift.
13 citations
Patent•
24 Nov 2010
TL;DR: In this paper, a multi-row ball type slewing bearing with three or over three rows of bearing rollers has been presented, which is suitable for working places requiring the bearing with high bearing capacity and good rigidity.
Abstract: The invention discloses a multi-row ball type slewing bearing and a machining method thereof. The multi-row ball type slewing bearing comprises an outer ring 1, an inner ring 2 and steel balls 3 and is characterized in that the inner annular surface of the outer ring 1 is provided with at least three rows of inner raceways at intervals according to a certain size; the outer annular ring of the inner ring 2 is also provided with at least three rows of raceways which correspond to the inner raceways of the outer ring; the inner raceways and the outer raceways are in the same shape, and corresponding raceways form complete steel ball raceways; and the steel balls 3 are evenly distributed in each row of steel ball raceway and separated by insulating blocks 6 or solid retainers 7. The multi-row ball type slewing bearing has three or over three rows of bearing rollers, thereby having high bearing capacity. Meanwhile, because the slew bearing needs less materials due to compact structure, thereby having good economic performance. The multi-row ball type slewing bearing is suitable for working places requiring the slewing bearing with high bearing capacity and good rigidity and limited in mounting space of the slewing bearing.
10 citations
TL;DR: In this paper, the cause of fretting wear in a blade bearing is analyzed and an improvement is proposed to evaluate the design of the bearing in order to control the wear of a bearing.
Abstract: This paper deals with fretting wear of blade bearings considering working conditions. The cause of fretting wear in blade bearing is analyzed and an improvement is proposed to evaluate the design of the bearing in the paper. Result from the test proves that the method of controlling fretting wear is satisfactory. Reference value of clearance in blade bearing can be obtained from the test result.
9 citations
Patent•
20 Jul 2010TL;DR: In this article, a four point contact ball bearing assembly is proposed for a wind powered turbine, in which each ball contacts inner surfaces of the raceway grooves in the inner and outer rings at four points.
Abstract: A slewing bearing assembly effective to suppress additional expenses such as a mold cost and to resolve the problem associated with insufficient strength brought about by voids and, also, a rotation section support apparatus for a wind powered turbine are provided. The slewing bearing assembly includes inner and outer rings having raceway grooves, and a plurality of balls interposed between the raceway grooves, and a spacer interposed between the neighboring balls. This slewing bearing assembly is a four point contact ball bearing, in which respective sectional shapes of the raceway grooves are so shaped as to represent shapes in which each balls contacts inner surfaces of the raceway grooves in the inner and outer rings at four points. The spacer is made of a resinous material having a melt viscosity within the range of 1000 to 2000 Pa·s at a temperature of 270° C.
8 citations
Patent•
24 Nov 2010
TL;DR: In this article, a full-hydraulic automobile crane is designed for the utility model, which is characterized by a rear supporting point of a boom with a slewing table, a front supporting point with an amplitude cylinder, the front part of the boom is placed on a boom bracket when the crane not works, the lower end of the bracket is connected with a chassis through a bolt, the upper end of a amplitude cylinder was connected with the boom, and the lower-end of the amplitude cylinders was linked with the Slewing Table, and a main hook and an auxiliary
Abstract: The utility model provides a full-hydraulic automobile crane, which is characterized in that a rear supporting point of a boom is connected with a slewing table, a front supporting point of the boom is connected with an amplitude cylinder, the front part of the boom is placed on a boom bracket when the crane not works, the lower end of the boom bracket is connected with a chassis through a bolt, the upper end of the amplitude cylinder is connected with the boom, and the lower end of the amplitude cylinder is connected with the slewing table; a main hook and an auxiliary hook respectively pass through a main lifting rope and an auxiliary lifting rope, and a pulley on the boom is driven to move up and down by a main winch and an auxiliary winch; the slewing table is connected on a slewing bearing through a bolt, and the slewing bearing is connected with the chassis through a bolt; a jib is connected on a boom hanging head through a pin shaft during the working process; a tool kit, a guard rail and a fifth supporting leg are respectively connected with the chassis through bolts; and a supporting leg is connected with the chassis through a pin shaft. The full-hydraulic automobile crane has the advantages of secure and reliable structure, attractive appearance and convenient operation; and compared with the vehicles of the same tonnage, the automobile crane is particularly characterized by high hoisting height.
8 citations
Patent•
10 Mar 2010
TL;DR: In this article, a folding arm type crane of a drilling platform is used for pick-and-place operation of a drill rod of an offshore petroleum drilling platform deck, where the main arm is articulated on the top of the rotary tower body and is supported by a luffing hydraulic cylinder.
Abstract: The utility model provides a folding arm type crane of a drilling platform, which is used for pick-and-place operation of a drill rod of an offshore petroleum drilling platform deck. A base is fixed on the deck close to a drill rod arrangement frame, and the top of the base is provided with a tower body swing mechanism and a rotary tower body, wherein the rotary tower body is provided with an armsupport part which comprises a main arm, a folding arm and a telescopic arm; the main arm is articulated on the top of the rotary tower body and is supported on the rotary tower body by a luffing hydraulic cylinder, and the other end of the main arm is articulated with the folding arm; the folding arm is supported on the main arm by a folding arm hydraulic cylinder, and the other end of the folding arm is connected with the telescopic arm by a telescopic hydraulic cylinder; and the other end of the telescopic arm is articulated with a rotating mechanism of an end clamp holder. The tower body swing mechanism comprises a slewing bearing inner ring, a slewing bearing outer ring and a swing support seat, wherein the slewing bearing inner ring is connected with the rotary tower body arranged atthe upper part of the slewing bearing inner ring by a high strength bolt, the slewing bearing outer ring is connected with the swing support seat positioned at the lower part of the slewing bearing outer ring by the high strength bolt, and the swing support seat is welded at the upper part of the base.
13 Mar 2010
TL;DR: In this paper, the relation between negative clearance and contact stress was investigated and a computation model for blade bearing without external load was proposed, considering elasticity of rings in computation and solve methods were discussed.
Abstract: Slewing ring with negative clearance is used as blade bearing in wind turbine. Negative clearance dramatically increase contact forces between balls and raceways. Existing methods for calculating loads between raceway and balls in four contact-point slewing ring suppose that the raceways are rigid and only assume elastic deformations of rolling elements. Experiments show that negative clearance dramatically increase contact forces between balls and raceways, and these forces make elastic deformations in rings of blade bearing. This paper investigates the relation between negative clearance and contact stress. A computation model for blade bearing without external load but considering elasticity of rings in computation is established and solve methods are discussed.
TL;DR: In this paper, the authors tried to represent the general static load-carrying capacity of four contact-point slewing bearings under general loading using a generalization of Sjovall and Rumbarger's equations.
Abstract: This work tries to represent the general static load-carrying capacity of fourcontact-point slewing bearings under general loading. This representation is based on a generalization of Sjovall and Rumbarger’s equations and provides an acceptance surface in the load space. This acceptance surface provides the key set of acceptance curves for the design and selection of bearings.
Patent•
29 Sep 2010
TL;DR: In this paper, a high-speed combination bearing for a rotating disk, which belongs to the technical field of slewing bearings, is described, where a gasket is arranged between the shaft washer and the seat ring, and an upper and lower raceway are respectively formed from the gasket and the shaft.
Abstract: The utility model relates to a high-speed combination bearing for a rotating disk, which belongs to the technical field of slewing bearings. The bearing comprises a seat ring (5), a shaft washer (1) and a gasket (4), wherein the gasket is arranged between the shaft washer and the seat ring, and an upper raceway and a lower raceway respectively formed from the gasket and the shaft washer, and the gasket and the seat ring are respectively provided with a set of assembly including an axial retainer (3) and an axial roller (2). The raceway formed from the gasket and the shaft washer is provided with radial rollers (6); and the gasket is uniformly provided with screw holes circumferentially in the position corresponding to the shaft washer and the seat ring. The utility model is characterized in that the external diameter of the shaft washer is provided with a step (9); and the radial rollers are uniformly distributed on the radial retainer (7) in the position of the step of the shaft washer. The radial retainer separates and retains the radial roller away so that the slewing bearing has favorable flexibility and low noise when working; and the step arranged at the radial raceway of the external diameter of the shaft washer guarantees the installation and fixation of the radial retainer. The utility model increases the limiting speed of the slewing bearing and effectively prolongs the service life of the slewing bearing.
Patent•
29 Dec 2010
TL;DR: In this article, an integral slewing device is fixed on the front end of the base assembly of a slewing bearing, an integral winch is arranged below the suspension arm, a telescopic arm is arranged in the suspended arm, and the lower part of the front part is provided with a hook; and the upright has a groove-shaped box structure.
Abstract: The invention relates to a telescopic arm type lorry-mounted crane which belongs to the technical field of telescopic arm type lorry-mounted crane. Compared with the existing telescopic arm type lorry-mounted crane, the weight and size of the entire machine are reduced and the height and manufacturing cost of the entire machine are lowered. In the crane of the invention, an integral slewing device is fixed on the front end of the base assembly of a slewing bearing; the slewing bearing is fixed on the back end of the base assembly of the slewing bearing; an upright is fixed on the slewing bearing; the top of the upright is connected with a suspension arm; the front end of the upright is hinged with the cylinder barrel of a derricking cylinder; the piston rod of the derricking cylinder is hinged with the middle part of the suspension arm; an integral winch is arranged below the suspension arm; a telescopic arm is arranged in the suspension arm; the lower part of the front end of the telescopic arm is provided with a hook; and the upright has a groove-shaped box structure, and the inclination of the slope of the box on the upright is matched with the inclination of a lower slope at the tail end of the suspension arm. The crane of the invention can be widely used to lift weights in various projects.
Patent•
24 Nov 2010
TL;DR: In this article, a cartoning and palletizing robot with a bottom base, a slewing frame, a manipulator mechanism, a wrist, a grip, and a wrist posture maintaining mechanism is presented.
Abstract: The utility model discloses a cartoning and palletizing robot, which comprises a bottom base, a slewing frame, a manipulator mechanism, a wrist, a grip, a wrist posture maintaining mechanism and a slewing bearing. The slewing bearing is connected onto the bottom base, the slewing frame is mounted on the slewing bearing and connected with the bottom base, the manipulator mechanism is connected with the slewing frame through a drive joint, the wrist is connected onto the manipulator mechanism and the wrist posture maintaining mechanism, and the grip is connected to the lower end of the wrist. The cartoning and palletizing robot can realize single input and single output of position and speed, and can also realize fast palletizing with speed up to 1500 times per hour, and also the robot has the advantages of simple structure, convenient operation, flexible action, easy maintenance, electricity and power conservation and the like.
TL;DR: A method for calculating the load distribution in an 8-point-contact slewing bearing under general load conditions (turnover moment, axial load and radial load) is discussed.
Abstract: An 8-point-contact slewing bearing is usually applied with strict requirements. The load distribution over raceways is the fundament to calculate both the static and dynamic capability of a slewing bearing. The paper discussed a method for calculating the load distribution in an 8-point-contact slewing bearing under general load conditions (turnover moment, axial load and radial load). Based on the method, some suggestions were proposed for optimization of the slewing bearing design.
Patent•
13 Jul 2010
TL;DR: In this article, the main body of a slewing bearing is fixed to any one of a first ring and a second ring of the bearing, and a pressing unit is installed by pressing a seal supplied from the exterior to the sealing installation position toward the sealing position as the first and second rings are relatively rotated.
Abstract: Disclosed is an apparatus for inserting a seal into a slewing bearing including a main body and a pressing unit. The main body is fixed to any one of a first ring and a second ring of the slewing bearing. The pressing unit projects from the main body toward a sealing installation position of the other one of the first ring and the second ring. The pressing unit is installed by pressing a seal supplied from the exterior to the sealing installation position toward the sealing installation position as the first ring and the second ring are relatively rotated. Therefore, the seal is installed at the sealing installation position between the first ring and the second ring of the slewing bearing so that the seal of the slewing bearing can be easily exchanged and an exchange operation time of the seal can be reduced.
Patent•
10 Mar 2010
TL;DR: In this article, a wind power used double row same diameter four point touching ball slewing bearing groove center distance tester, belonging to the technical field of bearing test, is presented. But the measurement wafer can adjust position up and down along with the main supporting rod.
Abstract: The invention provides a wind power used double row same diameter four point touching ball slewing bearing groove center distance tester, belonging to the technical field of bearing test. The invention is provided with a main supporting rod 4, a movable supporting rod 3 is hinged at the upper part of the main supporting rod 4, one end of the movable supporting rod 3 is connected with a measurementwafer 12 to construct a structure that the measurement wafer 12 can sway up and down relative to the main supporting rod 4; the main supporting rod 4 is provided with a rectangular hole for connecting a fixing rod 11, the other end of the fixing rod 11 is connected with the measurement wafer 12 to construct a structure that the fixing rod 11 can shift along the rectangular hole of the main supporting rod and the measurement wafer can adjust position up and down along with the fixing rod; the diameter of the measurement wafer 12 is identical to that of a bearing steel ball to be test; and a dialgauge 7 for measuring is arranged at the upper end of the main supporting rod 4, and the head of the dialgauge 7 is contacted with the other end of the movable supporting rod 3. The tester of the invention can realize the test on the mutual difference between the groove center distances of the tested bearing, thus exactly reflecting the parallel difference and the mutual difference between the groove center distances of the inner ring and the outer ring.
Patent•
26 May 2010
TL;DR: In this article, a full rotating walking chassis of a pile driver is shown, which is arranged below the main machine and comprises a rotary drive mechanism, traveling mechanism, a jacking mechanism and a main machine platform.
Abstract: The utility model discloses a full rotating walking chassis of a pile driver, which is arranged below the main machine and comprises a rotary drive mechanism, a traveling mechanism, a jacking mechanism and a main machine platform, wherein the rotary drive mechanism comprises a rotary motor, a swiveling small gear, a slewing bearing and a swiveling main gear; the traveling mechanism comprises a traveling trolley, a translation cylinder and walking boots; and the jacking mechanism comprises an adjusting device which can adjust the height of the jacking mechanism. The full rotating walking chassis can move in all directions, thus leading the construction of the pile driver to be more flexible.
TL;DR: Wang et al. as mentioned in this paper introduced a Slewing Bearing Monitoring and Diagnosis technique based on the singal of vibration, temperature, friction torque, acoustic emission, stress wave, including the methods of singal processing, especially Hilbert-Huang Transform (HHT), Ensemble Empirical Mode Decomposition-based Multiscale Principal Component Analysis (EEMD-MSPCA), and detailed described.
Abstract: Slewing bearing is widely used in engineering machinery, wind power generation, rotating restaurant and so on. Therefore, it is essentail to a study of monitoring and daiagnosis technique for slewing bearing. In this article, slewing bearing monitoring and diagnosis technique based on the singal of vibration, temperature, friction torque, acoustic emission, stress wave are introduced, including the methods of singal processing, especially Hilbert-Huang Transform (HHT), Ensemble Empirical Mode Decomposition–Based Multiscale Principal Component Analysis (EEMD-MSPCA) for local fault singal processing are detailed described. At last, various methods are compared.
Patent•
30 Sep 2010
TL;DR: A steering mechanism for a drawn vehicle to steer one or more turnable steered axles that at least has a slewing bearing is described in this article, where a rocker is fitted around a vertical shaft and is turnable.
Abstract: A steering mechanism for a drawn vehicle to steer one or more turnable steered axles that at least has: • A slewing bearing. • A rocker that is fitted around a vertical shaft and is turnable. • A cable whose ends are connected to the rocker on either side of the vertical shaft and which is fitted around the slewing bearing to transmit a turn of the slewing bearing to the rocker; and, • A tackle at each end of the cable with a fixed pulley that can be coupled to the drawn vehicle, and a movable pulley on the rocker.
01 Jan 2010
Patent•
[...]
21 Jul 2010
TL;DR: The slewing ring joint has two console supports (2,3) arranged on a vehicle component, and a ring damper chamber (20) is arranged in a space enclosed by an inner rotating ring as mentioned in this paper.
Abstract: The slewing ring joint has two console supports (2,3) arranged on a vehicle component. A ring damper chamber (20) is arranged in a space enclosed by an inner rotating ring. A ring damper chamber is formed by two inter-mounted housing sections rotatable relative to each other. The housing sections are associated with the console supports in a respective manner.
Patent•
27 Jan 2010
TL;DR: In this article, the utility model relates to a distributor for a high-speed wire rod mill, which belongs to a device special for distribution and applied to a coil collecting station which bundles wire rods to lead the same to be easy to transport, and mainly resolves the technical problem that the existing distributor has poor use effect, high price and inconvenient maintenance.
Abstract: The utility model relates to a distributor for a coil collecting station of a high-speed wire rod mill, which belongs to a device special for distribution and applied to a coil collecting station which sleeves wire rods in coil regularly on the circumference of a mandrel and bundles the wire rods to lead the same to be easy to transport, and mainly resolves the technical problem that the existing distributor has poor use effect, high price and inconvenient maintenance. The distributor for a coil collecting station of a high-speed wire rod mill comprises a reducer connected with a variable frequency motor, an outer ring gear slewing bearing, a pinion, a plurality of idler wheels, a plurality of swinging arms and an eccentric rotary disc, wherein the pinion is installed on an output shaft of the reducer and meshes with the outer ring gear of the outer ring gear slewing bearing; the eccentric rotary disc is disposed above the outer ring gear slewing bearing; the idler wheels are installed on a bearing block arranged under the swinging arms, the upper portions of the swinging arms are mounted on a bearing block installed above a window of a collecting tube, and the lower portions of the swinging arms are mounted inside circular holes of the eccentric rotary disc and lead the idler wheels to contact with the internal walls of the circular holes.
Patent•
03 Nov 2010
TL;DR: In this paper, a double-row ball type slewing bearing is installed between an inner ring and an outer ring, and the inner circumference and the outer circumference of the middle ring are respectively provided with an inner raceway and outer raceway the cross sections of which are semicircular.
Abstract: The utility model relates to a double-row ball type slewing bearing, belonging to a slewing bearing. The utility model is characterized in that a middle ring is arranged between an inner ring and an outer ring, and the inner circumference and the outer circumference of the middle ring are respectively provided with an inner raceway and an outer raceway the cross sections of which are semicircular. A group of steel balls is installed between the outer raceway of the inner ring and the inner raceway of the middle ring, and a group of steel balls is also installed between the outer raceway of the middle ring and the inner raceway of the outer ring. The upper parts of the inner circumference and the outer circumference of the middle ring positioned on the upper planes of the inner ring and the outer ring are respectively provided with a rectangular ring groove and a raceway sealing ring, and the lower parts of the inner circumference of the outer ring and the outer circumference of the inner ring positioned at the lower plane of the middle ring are respectively provided with a rectangular ring groove and a raceway sealing ring to protect the raceways against pollution. Bolt holes are uniformly distributed on the upper circumference of the middle ring, and the middle ring is fixed on an upper vehicle by bolts. The inner ring and the outer ring are fixed on the chassis of a truck crane. The total height of the slewing bearing is not increased, but the bearing capability is increased by about one time. The double-row ball type slewing bearing has the advantages of reasonable design and safe and reliable use.
Patent•
11 Aug 2010
TL;DR: In this article, a crossed three-row roller slewing bearing was designed for wind power generation, which is suitable for the strong wind and rotating load in the upper air for wind energy generation.
Abstract: The utility model relates to a crossed three-row roller slewing bearing. The structures on the left side and the right side of the bearing are symmetrically distributed, the bearing comprises an outer ring, a gland, an inner upper ring, an inner lower ring, a sealing ring, rollers, a retainer, second rollers, a second retainer and a third retainer, wherein the outer ring is inverted-T-shaped and arranged on the outermost side, the upper part of the outer ring is fixed through a screw, a sealing cover is fixed at the lower part of the outer ring through the gland, the inner upper ring is connected with the inner lower ring through a screw, the inner upper ring and the inner lower ring are respectively connected with the upper part and the lower part of the outer ring through the sealing ring and also connected with the middle part of the outer ring through the rollers, the retainer and the second retainer are respectively arranged among the rollers, the second rollers are arranged between the inner upper ring and the inner lower ring, and the third retainer is arranged among the second rollers. Compared with the prior art, the crossed three-row roller slewing bearing is suitable for the strong wind and rotating load in the upper air for wind power generation, enhances the processing property and adapts to the field aerial work for wind power generation.
Patent•
03 Nov 2010
TL;DR: In this paper, a photovoltaic automatic reversing chassis capable of pitching is presented, which comprises a base, wherein a slewing bearing is transversely arranged on the base; and two upright posts of a battery board bracket are vertically arranged on an inner gear ring of the bearing to do horizontal motion.
Abstract: The utility model discloses a photovoltaic automatic reversing chassis capable of pitching, which comprises a base, wherein a slewing bearing is transversely arranged on the base; and two upright posts of a battery board bracket are vertically arranged on an inner gear ring of the slewing bearing. A motor, a speed reducer, a driving gear and a controller are vertically arranged on the base; and the driving gear is meshed with an inner gear ring gear of the slewing bearing to do horizontal motion. One of the two upright posts of the battery board support is vertically provided with a photovoltaic rotating drive and the other upright post is vertically provided with a bearing; a long transverse shaft horizontally passes through the rotating drive and the bearing; and two ends of the long transverse shaft are connected with support lugs of the battery board. The rotating drive drives the long transverse shaft to vertically rotate for driving a solar panel and the bracket for doing the pitching rotation. Since the technology of tracking the sun by using the horizontal and pitching compound rotation, the photoelectricity conversion efficiency is the highest; and in addition, the utility model is particularly suitable for low-latitude zones with huge raising and decreasing angle of the sun (except an equatorial zone) and large and medium-sized photovoltaic generation enterprises to select.