CN210153089U - Slewing bearing for double-wheel milling power head part - Google Patents

Abstract

The utility model discloses a slewing bearing for a double-wheel milling power head part, which comprises a slewing bearing outer ring and a slewing bearing inner gear ring which are ring-shaped parts, wherein two rows of oval raceways are correspondingly arranged on the upper part and the lower part of the inner side surface of the slewing bearing outer ring and the outer side surface of the slewing bearing inner gear ring to form steel ball raceways; a plurality of steel balls are arranged in each row of steel ball rolling paths and are separated by an integral isolating ring; the height of the slewing bearing is more than or equal to 4 times of the diameter of the steel ball raceway. The utility model relates to a rationally, simple structure can keep higher precision, flexibility and life-span under the effect of high bearing, big impact force, provides effective guarantee for the operation of double round milling.

Description

Slewing bearing for double-wheel milling power head part

Technical Field

The utility model belongs to the technical field of slewing bearing, concretely relates to slewing bearing is used at double round milling unit head position.

Background

The slewing bearing is used as an important basic element of engineering machinery and construction machinery, and is an important force transmission element which is necessary for machinery which needs to perform relative rotation between all two parts and needs to bear axial force, radial force and overturning moment. It is widely used in the real industry and is called "joint of machine". The slewing bearing is divided into the following parts according to the structural style: single-row ball type, three-row column type, cross roller type, double-row eight-point contact ball type, ball column combination type and the like. The device is widely applied to automobile cranes, port cranes, railway cranes, ship cranes, container cranes, metallurgical cranes, excavators, filling machines, navigation instruments, and high, fine and advanced fields such as CT (computed tomography) standing wave therapeutic instruments, radar antenna bases, missile launcher, tanks, robots, rotary restaurants and the like.

With the development of the technology, the application field of the slewing bearing is more and more extensive, but the domestic market of the slewing bearing with high precision, long service life and high rotating speed is still blank, for example, a double-wheel slot milling machine works continuously and strongly in places of tens of meters underground, the rotating speed is high, the efficiency is high, the underground load is large, the disassembly and the maintenance are complex, and therefore higher requirements are provided for the precision of the slewing bearing and the service life of the slewing bearing.

SUMMERY OF THE UTILITY MODEL

For overcoming the defect among the above-mentioned background art, the utility model aims to provide a slewing bearing is used at double round milling power head position, slewing bearing simple structure can keep higher precision, flexibility and life-span under the effect of high bearing, big impact force, provides effective guarantee for the operation of double round milling.

The utility model provides a technical problem's technical scheme as follows:

the utility model relates to a slewing bearing for double round milling unit head position, including slewing bearing outer lane and slewing bearing ring gear that are the loop forming element, its characteristics are, the medial surface of slewing bearing outer lane and the lateral surface of slewing bearing ring gear are corresponding from top to bottom offered two rows of oval raceways and formed the steel ball raceway to increase slewing bearing's bearing; a plurality of steel balls are arranged in each row of steel ball rolling paths and are separated by an integral isolating ring; the height of the slewing bearing is more than or equal to 4 times of the diameter of the steel ball raceway. In the technical scheme, the isolating ring is adopted to replace an isolating block which is conventionally used in the slewing bearing, so that the steel balls in the steel ball raceway can be ensured to rotate reliably at equal intervals under the conditions of high bearing capacity and large impact force of the slewing bearing more effectively, and the slewing bearing is prevented from being broken down due to collision of the steel balls; similarly, the heights of the outer ring of the slewing bearing and the inner gear ring of the slewing bearing can be increased to be 4 times of the diameter of the steel ball raceway, so that the slewing bearing can bear heavier load and larger impact force.

As the utility model discloses technical scheme's further improvement, the blank material of slewing bearing outer lane and slewing bearing ring gear adopts 42CrMo, and the modulation hardness is 300 ~ 350HB, through the preferred to slewing bearing outer lane and slewing bearing ring gear material, cooperates its structural improvement, makes slewing bearing bears the ability further increase of high load and big impulsive force, ensures that this slewing bearing can orderly operation when using, reduces the emergence of trouble.

As a further improvement of the technical proposal of the utility model, the depth of the hardening layer of the steel ball raceway is 4.5-5 mm. In general, the hardening depth of the raceway of the slewing bearing generally used for the double-wheel milling power head part is 3-3.5mm, in the technical scheme, the hardening depth of the steel ball raceway is 1.5 times of the hardening depth of the raceway of the conventional slewing bearing, and the hardening depth is increased, so that the deformation of the steel ball raceway is reduced under heavy load condition of the slewing bearing in the technical scheme, the service life of the slewing bearing is prolonged, and the accuracy of the slewing bearing in use is further ensured.

As the utility model discloses technical scheme's further improvement, be the negative clearance after each subassembly of slewing bearing assembles, the axle radial clearance less than or equal to 0mm of slewing bearing outer lane and slewing bearing ring gear promptly, in order to keep slewing bearing's nimble rotation.

As the technical scheme of the utility model further improves, slewing bearing does not adopt the sealing strip, adopts the oil bath lubrication during the use, and lubricated effect is more high-efficient.

As the utility model discloses technical scheme's further improvement, the roughness of steel ball raceway is Ra 0.2 ~ 0.6um, and for Ra 0.8 ~ 1.6 um's the conventional roughness of raceway, coefficient of friction further reduces, reduces the frictional force of steel ball and steel ball raceway effectively, and then reduces slewing bearing's start-up moment.

As the utility model discloses technical scheme's further improvement, the material of isolating ring is red copper, through the improvement to the isolating ring material, effectively ensures the orderly operation of steel ball in the steel ball raceway.

When a double round mills power head position and implements with slewing bearing assembly, place the slewing bearing outer lane earlier on the assembly bench, place the isolating ring of red copper material behind the steel ball raceway, put into the slewing bearing outer lane with the slewing bearing ring gear again in, after adjusting the position, pack into the isolating ring in the steel ball raceway to the steel ball of fixed quantity (the steel ball paints 80W-90 gear oil) by the plug hole, the plug hole is seted up according to conventional method when the slewing bearing outer lane preparation, blocks up on the final device. After the assembly, because the negative clearance can not the direct detection can only be through carrying out the start-up moment and detect, require its no-load start-up moment: 60-200 N.m, namely the requirement is met.

Compared with the prior art, the utility model has the advantages of reasonable design, simple structure, convenient assembling through to the structural improvement of slewing bearing for the original double round milling unit head position to the preferred of each subassembly material and parameter of cooperation can make slewing bearing bears at the height, under the effect of big impulsive force, the axial diameter of slewing bearing outer lane and slewing bearing ring gear is jumped equal to or less than 0.05mm, and the tooth is jumped equal to or less than 0.20mm, can be under heavy load pivoted condition, remains the negative clearance throughout (axial diameter is to the clearance less than or equal to 0mm), keeps simultaneously rotating in a flexible way, increases slewing bearing's life, increases slewing bearing's maintenance cycle, effectively guarantees the operation that the double round milled, and the practicality is strong.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic view of a separating ring of the present invention;

FIG. 3 is a schematic view of the expanded plane of the spacer ring of the present invention;

FIG. 4 is a schematic side view of a spacer ring according to the present invention;

in the figure: 1. an outer ring of the slewing bearing; 2. a steel ball; 3. an isolating ring; 4. an inner slewing bearing gear ring; 5. a steel ball raceway.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The parts of the present invention not described in detail are the known techniques of those skilled in the art.

As shown in fig. 1 to 4, the utility model relates to a slewing bearing for double round milling unit head position, including slewing bearing outer lane 1 and slewing bearing ring gear 4 that are the loop forming element, the medial surface of slewing bearing outer lane 1 and the lateral surface of slewing bearing ring gear 4 have seted up two rows of oval raceways from top to bottom correspondingly and have formed steel ball raceway 5, are provided with a plurality of steel balls 2 in each row of steel ball raceway 5 and separate through the spacing ring 3 of holistic red copper material; the height of the slewing bearing is more than or equal to 4 times of the diameter of the steel ball raceway 5. In the embodiment, blank materials of the slewing bearing outer ring 1 and the slewing bearing inner gear ring 4 are 42CrMo, and the modulation hardness is 300-350 HB; the depth of a hardening layer of the steel ball raceway 5 is 4.5-5mm, which is equivalent to 1.5 times of the depth of the hardening layer of the raceway of a conventional slewing bearing used for a double-wheel milling power head part, the roughness Ra of the steel ball raceway 5 is 0.2-0.6 um, and the roughness of the steel ball raceway is reduced by more than one time compared with the roughness of the original raceway Ra of 0.8-1.6 um; in the embodiment, each component of the slewing bearing is a negative clearance after being assembled, so that the clearance after being stressed and loaded is 0 to keep the rotation flexibility; compared with the conventional slewing bearing, the slewing bearing provided by the embodiment has the advantages that the sealing cover is removed, and oil bath lubrication is adopted.

In the embodiment, as the depth of the quenching layer of the steel ball raceway is ensured to be 1.5 times of the depth of the quenching layer of the slewing bearing with the same model used for the original double-wheel milling power head part, the raceway quenching process must be changed to meet the requirements:

1) preheating the product to 500-600 ℃ before quenching

2) Heating the product to 1100 ℃, and then processing the steel ball raceway by processing equipment according to parameters of the linear velocity of 17.5mm/min, the power of 40-50 KW, the frequency of 4000-7000 Hz, the current of 120-170A and the voltage of 260-420V.

At present, a common slewing bearing processing raceway is turned instead of ground, and in order to ensure that the slewing bearing is in a negative clearance after being assembled, the slewing bearing steel ball raceway of the type adopts grinding processing; when grinding the steel ball roller path, a special double-row ball program is compiled, and the upper elliptical roller path and the lower elliptical roller path are machined once to control the gap and the consistency of the upper elliptical roller path and the lower elliptical roller path of a product; as the working conditions have very high requirements on axial runout, radial runout and tooth runout of the slewing bearing, a magnetic sucker is adopted during processing, and the outer circle or the inner hole is positioned and planed after the raceway is processed, so that the raceway, the plane, the outer circle or the inner hole share the same reference, and the relative axial runout is less than or equal to 0.05mm and the tooth runout is less than or equal to 0.20 mm.

During assembly, the slewing bearing outer ring 1 is placed on an assembly table, the isolating ring 3 made of red copper is placed on the steel ball raceway 5, the slewing bearing inner gear ring 4 is placed in the slewing bearing outer ring 1, after the position is adjusted, a fixed number of steel balls 2 (the steel balls are coated with 80W-90 gear oil) are placed in the isolating ring 3 in the two rows of steel ball raceways 5 through plugging holes, the plugging holes are formed in the slewing bearing outer ring 1 in a conventional method during manufacturing, and finally plugging is carried out. After the assembly, because the negative clearance can not the direct detection can only be through carrying out the start-up moment and detect, require its no-load start-up moment: 60-200 N.m, namely the requirement is met.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.

Claims (7)

1. A slewing bearing for a double-wheel milling power head part comprises a slewing bearing outer ring (1) and a slewing bearing inner gear ring (4) which are ring-shaped parts, and is characterized in that two rows of oval ball tracks are correspondingly arranged on the upper part and the lower part of the inner side surface of the slewing bearing outer ring (1) and the outer side surface of the slewing bearing inner gear ring (4) to form steel ball tracks (5), and a plurality of steel balls (2) are arranged in each row of steel ball tracks (5) and are separated by an integral isolating ring (3); the height of the slewing bearing is more than or equal to 4 times of the diameter of the steel ball raceway (5).

2. The slewing bearing for the power head part of the double-wheel milling machine according to claim 1, wherein blank materials of the outer ring (1) of the slewing bearing and the inner gear ring (4) of the slewing bearing are 42CrMo, and the modulation hardness is 300-350 HB.

3. The slewing bearing for the power head part of the double-wheel milling machine according to claim 1, wherein the depth of the hardened layer of the steel ball raceway (5) is 4.5-5 mm.

4. The slewing bearing for the location of the dual-wheel milling power head as claimed in claim 1, wherein the components of the slewing bearing are negative clearance after assembly.

5. The double round milling head position slewing bearing of claim 1, wherein the slewing bearing does not employ a sealing cover.

6. The slewing bearing for the power head part of the double-wheel milling machine according to claim 1, wherein the roughness Ra of the steel ball raceway (5) is 0.2-0.6 um.

7. The slewing bearing for the power head of the double-wheel milling machine according to claim 1, wherein the isolating ring (3) is made of red copper.

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