Slewing ring

FIELD: transportation.

SUBSTANCE: slewing ring contains fixed and movable rings with running paths contacting with rolling bodies located between them. Cross-section of running paths profile represents square equally inclined to ring base, with radial recesses made on each of its sides, and running paths consist of 8 rectilinear and 4 radial surfaces located along diameter of ring running paths centre. In running paths with rectilinear surfaces rolling bodies of roller-type are installed, and between them/in running paths with radial surfaces - rolling bodies of ball-type, at that, balls diameter exceeds rollers diameter.

EFFECT: increase of load-carrying capability of running paths and lowering of contact loads.

2 cl, 6 dwg

 

The invention relates to a support and turning circles cranes and other lifting machines.

The known reference-turntable lifting machines, as the USSR №265001, M CL 02F 9/12, comprising a fixed and movable upper and lower rings, and installed in raceways (treadmills) rolling elements (rollers). The stationary ring of the circle is attached to the rotary part of the crane, moving to the rotary part.

Job description support-rotating circles hoisting machine

The transfer of loads to the load occurs through the bonded upper and lower movable ring circle on the rolling body, and then to the stationary ring of the circle and in the case of hoisting machine.

Description of the shortcomings of the support-rotating circles

In the known construction the rollers are in constant point contact with each other and in line with treadmills. In the process, the contact of the rollers with each other is on the circle line, the entire rest of the surface is out of contact, and contact with treadmills is on the line.

In the widely used designs [1] support-rotating circles with crosswise arranged roller rolling bodies treadmills work in pairs depending on the load. Just transfer loads in one direction may participate up to 50% of Alikov of their total number in the turning circle; of these, only 25% of the rollers take the load. Therefore, in most cases, the roller bearing slewing circle, worked for 3...5 years, have wear and tear in the form of an annular groove on the surface, which is their destruction. At the same time an annular protrusions on the surface of treadmills, which together leads to failure of the rotation circle. It is a disadvantage of the known designs support-rotating circles with the roller rolling bodies.

In the support-rotating circles with the ball rolling bodies load perceive 50% of the rolling elements regardless of the direction of load. When used in rotation circles ball rolling bodies in the process is point contact between rolling elements and raceways, why perimeter raceways formed spherical annular grooves. This causes wear tracks of the rings reference-turning circle, which is the lack of support-rotating circles with the ball rolling bodies.

An object of the invention is to develop a design support-turntable, allowing to increase the load-carrying capacity of cross-country tracks by replacing in the turning circle with a cross-shaped arrangement of the roller rolling bodies of their half of the ball, the diameter of which exceeds d is Amer roller rolling bodies.

The technical result is achieved in that the cross-section profile of treadmills is ravnoudaleny to the base circle of the square is made in the center of each side of the radial notches, and treadmills consist of 8 straight and 4 curved surfaces located on the diameter of the rings of the circle, which is installed in the treadmill with straight surfaces - cross roller rolling elements, and between them on the treadmills with radial surfaces - ball body rolling, and ball diameter exceeds the diameter of the rollers and the width of the radial grooves for ball rolling bodies are made in the range from 0.004 diameter center treadmills rings turntable up to 1/3 of the width of the roller (the calculation is made according to the recommendations [2]). When installing the rolling elements so the load is distributed and the additional radial surfaces running tracks, and the total number of rolling bodies that will work and take a load in any direction, up to 65% of the total. This will allow a more efficient allocation attached and to reduce the contact load on the treadmills up to 25%, thus increasing their load-carrying capability.

Figure 1 shows the cross-section profile of the support-of the turntable, where 1, 2 - moving rings, 3 - a fixed number of the TSO, 4 - treadmills, 5, 6 - ball and roller body roll. Figure 2 shows a longitudinal section a-a track of the turntable and the location of the rolling elements; Fig 3 shows the location of the wear surface of the roller 6 with a width "b"; the sections "a", "C" are wearing the extrusion surface of the rectilinear treadmill, resulting in a surface in the form of an annular protrusion "b" in height δ1on a treadmill. Figure 4 shows the location of wear on the treadmill from the ball rolling bodies in the form of a spherical groove "d" depth δ2. Figure 5 shows the section b-B anchor-turntable with spaced ball rolling elements 5 located between treadmills in point contact. Figure 6 shows the straight surfaces running tracks in linear contact with the rollers. The proposed profile of the treadmill of the rings 1, 2, 3 allows you to set the treadmill bearing slewing circle cross roller and between the ball body rolling, thereby to increase the total working surface in the contact area with treadmills. Structural change of treadmills is that in place of the protrusion "b", figure 3, which is formed during operation on treadmills circle with the roller rolling bodies, is radial vyamk is for placement of the balls; this eliminates the possibility of occurrence of a ledge. Due to this construction of the supporting-turntable wear of the raceway is extended in time, which increases the durability of the circle as a whole.

Reference literature

1. Zaitsev L.V., masroor PPM mobile cranes. M.: Higher school. 1982

2. Pinegin S. C. Contact durability and rolling resistance. M: Engineering. 1969

1. Bearing slewing rim, comprising a fixed and movable rings with treadmills in contact with the rolling elements located between them, characterized in that the cross-section profile of treadmills is ravnoudaleny to the base circle of the square is made in the center of each side of the radial notches, and treadmills consist of 8 straight and 4 curved surfaces located on the diameter of the rings of the circle, dened in treadmills with straight surfaces cross roller rolling bodies, and between them on the treadmills with radial surfaces - ball rolling bodies, and the ball diameter exceeds the diameter of the rollers.

2. Bearing slewing rim according to claim 1, characterized in that the width of the radial grooves for ball rolling bodies are made in the range from 0.004 diameter center treadmills rings turntable up to 1/3 of the width of the roll is CA.



 

Same patents:

Turn drive // 2328442

FIELD: mechanics.

SUBSTANCE: invention can be used in devices designed for turning in a horizontal or vertical plane. The turn drive contains a tooth rim meshing with two identical main gears; the said rim is assembled on a turning portion of the object, this turning portion is installed with a support component on the base whereon an electric motor, a brake mechanism and a reducer are arranged. The electric motor via a coupling is connected to an input shaft of the reducer which includes a frictional mechanism to limit a maximum torque at the input shaft of the reducer, self braking worm gear and two differential mechanisms. Each of the differential mechanisms is made as a planetary drive equipped with an epicyclic gear, a sun gear, a carrier and satellites. One of the main gears is secured to the shaft made as one whole with the carrier of the first planetary gear, the axis of which is geometrically coupled with the central axis of the latter. The other main gear is fixed on the shaft installed in the case of the reducer; whereon the gear is attached meshing with the gear made as one whole with the epicyclic gear of the first planetary gear mechanism. The sun gear of the second planetary gear mechanism is connected to the shaft of the motor; epicyclic gear of the planetary gear mechanism by means of tooth meshing is kinematically tied to the above said friction mechanism. The sun gear of the first planetary gear mechanism is secured on the shaft which is kinematically tied with the carrier of the second planetary gear mechanism via the said self braking worm gear.

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Turning drive // 2323153

FIELD: mechanical engineering.

SUBSTANCE: invention can be used in devices designed for providing turns in horizontal or vertical planes. Proposed turning drive contains motor with brake, reduction gear, friction mechanism to limit maximum torque on reduction gear shaft and differential mechanism, all mounted on support and turnable (movable) parts of object. Motor is connected with input shaft of reduction gear on output shaft of which ring main gear is secured, being in meshing with gear rim. Differential mechanism is made in form of planetary train with epicyclic gear, sun gear, carrier and planet pinions. Sun gear is connected with motor shaft, carrier is connected with input shaft of reduction gear, and epicyclic gear is mechanically coupled with said friction mechanism through gearing.

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EFFECT: elimination of misalignment in drive gear and toothed crown teeth meshing to thereby enhance reliability and prolong service life of apparatus.

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FIELD: materials handling facilities.

SUBSTANCE: invention relates to turntables of cranes and other load lifting machines. Proposed turntable consists of fixed and movable upper and lower rings and roller solids of revolution arranged in cress-cross manner and installed in raceways. Ring step formed on raceways by rollers worn along ring is eliminated by sphere of ball solids of revolution installed between roller solids of revolution.

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EFFECT: provision of compact device for use in confined spaces.

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FIELD: mechanical engineering.

SUBSTANCE: invention relates to slewing circles of cranes and other load-lifting machines. Proposed slewing circle consists of fixed and movable upper and lower races interconnected by bolts, and solids of revolution placed in between. Lower movable race is connected with gasket made of high-strength material installed from lower side of race. Said gasket can be sectional, with butts located in non-loaded zones and can be secured by bolts or glue.

EFFECT: increased durability of slewing circle.

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The invention relates to hoisting and transport machinery

The invention relates to the field of lifting and transport machinery, namely the support-rotating devices craniomandibular installations

FIELD: materials handling facilities.

SUBSTANCE: invention relates to devices for taking loose materials from pile and stowing them in layers differing in content of useful component in each layer with simultaneous averaging in process of taking material from pile and it can be used in open stores. Proposed loose material stower-gripper has boom of gripper and boom of stower of lift-lower type turnable in horizontal plane by slewing circle installed on base and drives to turn booms of gripper and stower. Slewing circle is made in form of fixed rings rigidly secured to each other and to frame of base, two coaxially arranged movable rings with gear rims resting of fixed rings through solids of revolution. Movable rings are non-connected mechanically, one movable ring being furnished with external teeth rim coupled with gripper boom turning drive, and the other is provided with internal teeth rim coupled with stower boom turning drive. Each toothed rim has independent self-contained system to regulate geometrical parameters of mating of solids of revolution with movable and fixed rings. Base be made in form of self-propelled chassis or stationary portal. Gripper boom has gripping member of rotary or scraper type.

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FIELD: mechanical engineering.

SUBSTANCE: invention relates to slewing circles of cranes and other load-lifting machines. Proposed slewing circle consists of fixed and movable upper and lower races interconnected by bolts, and solids of revolution placed in between. Lower movable race is connected with gasket made of high-strength material installed from lower side of race. Said gasket can be sectional, with butts located in non-loaded zones and can be secured by bolts or glue.

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FIELD: materials handling facilities.

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FIELD: mechanical engineering.

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FIELD: mechanics.

SUBSTANCE: invention can be used in devices designed for turning in a horizontal or vertical plane. The turn drive contains a tooth rim meshing with two identical main gears; the said rim is assembled on a turning portion of the object, this turning portion is installed with a support component on the base whereon an electric motor, a brake mechanism and a reducer are arranged. The electric motor via a coupling is connected to an input shaft of the reducer which includes a frictional mechanism to limit a maximum torque at the input shaft of the reducer, self braking worm gear and two differential mechanisms. Each of the differential mechanisms is made as a planetary drive equipped with an epicyclic gear, a sun gear, a carrier and satellites. One of the main gears is secured to the shaft made as one whole with the carrier of the first planetary gear, the axis of which is geometrically coupled with the central axis of the latter. The other main gear is fixed on the shaft installed in the case of the reducer; whereon the gear is attached meshing with the gear made as one whole with the epicyclic gear of the first planetary gear mechanism. The sun gear of the second planetary gear mechanism is connected to the shaft of the motor; epicyclic gear of the planetary gear mechanism by means of tooth meshing is kinematically tied to the above said friction mechanism. The sun gear of the first planetary gear mechanism is secured on the shaft which is kinematically tied with the carrier of the second planetary gear mechanism via the said self braking worm gear.

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FIELD: transportation.

SUBSTANCE: slewing ring contains fixed and movable rings with running paths contacting with rolling bodies located between them. Cross-section of running paths profile represents square equally inclined to ring base, with radial recesses made on each of its sides, and running paths consist of 8 rectilinear and 4 radial surfaces located along diameter of ring running paths centre. In running paths with rectilinear surfaces rolling bodies of roller-type are installed, and between them/in running paths with radial surfaces - rolling bodies of ball-type, at that, balls diameter exceeds rollers diameter.

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EFFECT: longer life of SRD and machine proper.

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