CN108468716B

CN108468716B - Method for improving chemical raw material stirring efficiency

Info

Publication number: CN108468716B
Application number: CN201810633545.4A
Authority: CN
Inventors: 杨胜
Original assignee: Rizhao Road Materials Co Ltd
Current assignee: Rizhao Road Materials Co., Ltd
Priority date: 2018-06-20
Filing date: 2018-06-20
Publication date: 2020-05-08
Anticipated expiration: 2038-06-20
Also published as: CN108468716A

Abstract

The invention belongs to the technical field of chemical raw material stirring, and particularly relates to a method for improving the stirring efficiency of chemical raw materials, which adopts a ball bearing, wherein the ball bearing comprises an inner ring, an outer ring, a rolling body and a first retainer; the device also comprises a rotating device and a rolling ball; the inner ring is spherical, and the middle part of the inner ring is provided with a mounting hole for mounting a shaft; the top and the bottom of the inner ring are respectively provided with a rotating device; the rotating device comprises a rotating ring and a cushion block; a group of cushion blocks are arranged on the outer ring of the rotating ring; the end of the cushion block is connected with a rolling ball; one side of the rolling ball is in contact with the rolling body, the other side of the rolling ball is arranged in a vertical groove on the outer side of the inner ring, and a group of rolling balls form a circular ring; two groups of circular rolling balls are arranged on the periphery of the inner ring through a second retainer. Promote the slip of arc slider through the spin for lubricating oil in the oil groove has increased the area covered of lubricating oil on the spin through the shell fragment splash, thereby has improved lubricated effect.

Description

Method for improving chemical raw material stirring efficiency

Technical Field

The invention belongs to the technical field of chemical raw material stirring, and particularly relates to a method for improving the stirring efficiency of chemical raw materials.

Background

Chemical industry raw materials when the stirring, drive the (mixing) shaft through the motor and mix the raw materials in with the agitator tank, in order to improve chemical industry raw materials' stirring efficiency, can change the stirring leaf into the rotary type, when the stirring, the stirring leaf passes through the bearing and the (mixing) shaft links to each other, utilizes the raw materials extrusion stirring leaf, stirs the leaf and produces relative rotation when the (mixing) shaft is rotatory.

And the bearing is a component for fixing and reducing the load friction coefficient in the mechanical transmission process. It can also be said that the member for reducing the friction coefficient during power transmission and keeping the center position of the shaft fixed when the other members are moved relative to each other on the shaft. The bearing is a lightweight part in modern mechanical equipment. Its main function is to support the mechanical rotating body to reduce the friction coefficient of mechanical load of equipment in the transmission process.

Ordinary ball bearing can not produce the swing when the transmission rotates, and this just makes the stirring also can not swing at driven in-process, and the position of its stirring is relatively fixed, causes the stirring of industrial chemicals insufficient.

Disclosure of Invention

In order to make up the defects of the prior art, the method for improving the stirring efficiency of the chemical raw materials adopts the ball bearing, the rotating plate is extruded by the rolling ball in the ball bearing to rotate, so that the vibration of rotating extrusion is relieved, the rolling ball moves in the arc groove in the rotating plate, the rolling ball is prevented from contacting with the rolling body for a long time, and the abrasion of the rolling ball is reduced; meanwhile, the rolling ball pushes the arc-shaped sliding block to slide, so that lubricating oil in the oil groove is sputtered onto the rolling ball through the elastic sheet, the coverage area of the lubricating oil is increased, and the lubricating effect is improved.

The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a method for improving the stirring efficiency of chemical raw materials, which comprises the following steps:

the method comprises the following steps: mounting a stirring motor on a vibration reduction plate of a stirring tank;

step two: connecting the stirring motor in the first step to a gearbox through a transmission shaft;

step three: connecting a stirring shaft in the stirring tank to the output shaft of the gearbox in the second step;

step four: mounting a rotary vane on the end of the stirring shaft in the third step by using a ball bearing;

the ball bearing comprises an inner ring, an outer ring, rolling bodies and a first retainer, and the ball bearing sealing device is not shown; the device also comprises a rotating device and a rolling ball; the inner ring is spherical, and the middle part of the inner ring is provided with a mounting hole for mounting a shaft; the top and the bottom of the inner ring are respectively provided with a rotating device; the rotating device comprises a rotating ring and a cushion block; a group of cushion blocks are arranged on the outer ring of the rotating ring; the end of the cushion block is connected with a rolling ball; one side of the rolling ball is in contact with the rolling body, the other side of the rolling ball is arranged in a vertical groove on the outer side of the inner ring, and a group of rolling balls form a circular ring; two groups of circular rolling balls are arranged on the periphery of the inner ring through a second retainer. When the rolling ball extruding device works, when the rotating shaft is extruded in the rotation of the inner ring, the rolling ball in the vertical groove on the outer side of the inner ring is extruded, the rolling ball continues to extrude the rolling body, and the displacement of the rolling ball when being extruded determines the swing amplitude of the rotating shaft in the inner ring.

Preferably, the cushion block consists of a mounting seat and a rotating plate; the outer ring of the rotating ring is provided with a group of mounting seats; one end of the rotating plate is rotatably installed on the installation seat through a rotating shaft, and a torsion spring is arranged in the rotating shaft; the mounting seat is connected with a rolling ball through a telescopic rod. When the rolling ball is extruded at the periphery of the inner ring in the working process, the rolling ball enables the rotating plate to rotate to one side close to the rotating ring, so that the vibration generated in the extrusion process is reduced, and the rotating ring resets under the action of the torsion spring after the rolling ball leaves.

Preferably, one side of the rotating plate is provided with a group of arc grooves with equal arc length; the rolling ball is positioned in the arc groove; the bottom of the arc groove at the end of the rotating plate is provided with a through hole; a connecting rod fixedly connected with the rotating ring is arranged in the through hole and is used for jacking the rolling ball; one side of the connecting rod is provided with a steel wire which is fixedly connected with the rotating ring, and the steel wire penetrates through the through hole of the rotating plate and is connected with the rolling ball. When the rolling mechanism works, the rolling ball extrudes the rotating plate to rotate towards one side close to the rotating ring, the rolling ball contacts the connecting rod during rotation, and moves from the arc groove at the upper end of the rotating plate to the arc groove at the lower end of the rotating plate under the action of the connecting rod, so that the rotating contact of the rolling body and the rolling ball at the same place for a long time is relieved; and meanwhile, when the rolling ball moves into the arc groove at the lower end of the rotating plate, the rolling ball is reset under the action of the steel wire.

Preferably, a group of oil grooves are symmetrically arranged in the inner ring up and down, and lubricating oil for lubricating the rolling balls is filled in the oil grooves; an arc-shaped sliding block is arranged in a vertical groove of the rolling ball arranged on the periphery of the inner ring in a sliding manner; the arc-shaped sliding block can block the opening of the oil groove. During operation, the reciprocating motion of spin in the circular arc recess for the spin promotes the arc slider and makes a round trip to slide in inner circle outlying vertical recess, and when the arc slider left the oil groove opening, lubricating oil emerged from the oil groove opening, and the arc slider will emerge in sliding simultaneously lubricating oil and push away the position of spin and lubricate it, thereby has reduced the wearing and tearing of spin.

Preferably, the two ends of the arc-shaped sliding block are respectively provided with an arc-shaped groove positioned in the inner ring vertical groove; the arc-shaped groove is internally provided with an outward convex elastic sheet, one end of the elastic sheet is fixedly connected with the end of the arc-shaped groove, and the other end of the elastic sheet is suspended. During operation, the spin promotes the arc slider and slides, pushes away the lubricating oil that emits in the oil groove to arc groove simultaneously, and the arc slider continues to slide, and the shell fragment is compressed, leaves the shell fragment when the arc slider after, and the shell fragment has been strutted, and in stretching of shell fragment, the shell fragment splashes the lubricating oil of arc groove to the spin, has increased the coverage area of lubricating oil to lubricated effect has been improved.

The invention has the following beneficial effects:

1. according to the method for improving the stirring efficiency of the chemical raw materials, the ball bearing is adopted, the rotating shaft in the ball bearing is extruded through the inner ring in the rotating process, so that the rolling balls in the vertical grooves on the periphery of the inner ring correspondingly extrude the rolling bodies, and the swing amplitude of the rotating shaft in the inner ring is determined by the moving displacement of the rolling balls in the extruding process.

2. According to the method for improving the stirring efficiency of the chemical raw materials, the ball bearing is adopted, and the rotating plate correspondingly rotates through the rolling ball in the ball bearing in the extrusion process, so that the vibration generated in the extrusion process is relieved; the rolling ball is prevented from rolling and contacting with the rolling body for a long time from one circular arc groove to the other circular arc groove, so that the abrasion of the rolling ball is reduced.

3. According to the method for improving the stirring efficiency of the chemical raw materials, the ball bearing is adopted, the arc-shaped sliding block is pushed to slide in the vertical sliding groove at the periphery of the inner ring by the rolling ball in the ball bearing in a back-and-forth motion process, the lubricating oil overflowing from the oil groove is pushed to the arc-shaped groove, the spring plate is stretched to sputter the lubricating oil in the arc-shaped groove into the rolling ball in the compression and stretching of the spring plate, the coverage area of the lubricating oil is increased, and therefore the lubricating effect is improved.

Drawings

The invention will be further explained with reference to the drawings.

FIG. 1 is a process flow diagram of the present invention;

FIG. 2 is a front view of a ball bearing;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a cross-sectional view B-B of FIG. 2;

in the figure: the rolling device comprises an inner ring 1, an oil groove 11, an arc-shaped sliding block 12, an arc-shaped groove 13, an elastic sheet 14, an outer ring 2, rolling bodies 3, a first retainer 4, a rotating device 5, a rolling ball 6, a second retainer 7, an expansion link 8, a rotating ring 51, a cushion block 52, a mounting seat 53, a rotating plate 54, an arc-shaped groove 55, a connecting rod 56 and a steel wire 57.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 4, the method for improving the stirring efficiency of chemical raw materials according to the present invention includes the following steps:

the ball bearing comprises an inner ring 1, an outer ring 2, a rolling body 3 and a first retainer 4; the ball bearing sealing device is not shown, and also comprises a rotating device 5 and a rolling ball 6; the inner ring 1 is spherical, and the middle part of the inner ring 1 is provided with a mounting hole for mounting a shaft; the top and the bottom of the inner ring 1 are respectively provided with a rotating device 5; the rotating device 5 comprises a rotating ring 51 and a cushion block 52; a group of cushion blocks 52 are arranged on the outer ring of the rotating ring 51; the end of the cushion block 52 is connected with a rolling ball 6; one side of the rolling ball 6 is in contact with the rolling body 3, the other side of the rolling ball 6 is arranged in a vertical groove at the outer side of the inner ring 1, and a group of rolling balls 6 form a circular ring shape; two sets of annular rolling balls 6 are mounted on the periphery of the inner ring 1 through a second retainer 7. When the rolling ball extruding device works, when the rotating shaft is extruded in the rotation of the inner ring 1, the rolling ball 6 in the vertical groove at the outer side of the inner ring 1 is extruded, the rolling ball 6 continuously extrudes the rolling body 3, and the swing amplitude of the rotating shaft in the inner ring 1 is determined by the displacement of the rolling ball 6 in the extrusion process.

As an embodiment of the present invention, the pad 52 is composed of a mounting seat 53 and a rotating plate 54; a group of mounting seats 53 are arranged on the outer ring of the rotating ring 51; one end of the rotating plate 54 is rotatably mounted on the mounting seat 53 through a rotating shaft, and a torsion spring is arranged in the rotating shaft; the mounting seat 53 is connected with a rolling ball 6 through a telescopic rod 8. In operation, when the rolling ball 6 is pressed at the periphery of the inner ring 1, the rolling ball 6 enables the rotating plate 54 to rotate towards one side close to the rotating ring 51, so that vibration generated in pressing is relieved, and after the rolling ball 6 leaves, the rotating ring 51 is reset under the action of the torsion spring.

As an embodiment of the present invention, one side of the rotating plate 54 is provided with a set of arc grooves 55 with equal arc length; the rolling ball 6 is positioned in the arc groove 55; the bottom of the arc groove 55 at the end of the rotating plate 54 is provided with a through hole; a connecting rod 56 fixedly connected with the rotating ring 51 is arranged in the through hole, and the connecting rod 56 is used for jacking the rolling ball 6; one side of the connecting rod 56 is provided with a steel wire 57 fixedly connected with the rotating ring 51, and the steel wire 57 passes through the through hole of the rotating plate 54 and is connected with the rolling ball 6. When the rolling mechanism works, the rolling ball 6 presses the rotating plate 54 to rotate towards one side close to the rotating ring 51, the rolling ball 6 contacts the connecting rod 56 during rotation, and under the action of the connecting rod 56, the rolling ball 6 moves from the circular arc groove 55 at the upper end of the rotating plate 54 to the circular arc groove 55 at the lower end of the rotating plate 54, so that the rotating contact of the rolling body 3 and the rolling ball 6 for a long time is relieved; at the same time, when the ball 6 moves into the circular arc groove 55 at the lower end of the rotating plate 54, the ball 6 resets the ball 6 under the action of the steel wire 57.

As an embodiment of the invention, a group of oil grooves 11 are symmetrically arranged in the inner ring 1 from top to bottom, and lubricating oil for lubricating the rolling balls 6 is filled in the oil grooves 11; an arc-shaped sliding block 12 is arranged in a vertical groove of the rolling ball 6 arranged at the periphery of the inner ring 1 in a sliding manner; the arc slider 12 can block the opening of the oil groove 11. During operation, spin 6 round trip movement in circular arc recess 55 for spin 6 promotes slider 12 and makes a round trip to slide in the 1 outlying vertical recess of inner circle, when slider 12 leaves oil groove 11 opening, lubricating oil emerges from oil groove 11 opening, and slider 12 pushes away the position of spin 6 and lubricates it with the lubricating oil that emerges simultaneously in sliding, thereby has reduced spin 6's wearing and tearing.

As an embodiment of the invention, two ends of the arc-shaped sliding block 12 are respectively provided with an arc-shaped groove 13 positioned in a vertical groove of the inner ring 1; the arc-shaped grooves 13 are internally provided with elastic sheets 14 protruding outwards, one ends of the elastic sheets 14 are fixedly connected with the ends of the arc-shaped grooves 13, and the other ends of the elastic sheets 14 are suspended. During operation, spin 6 promotes the slider-arc 12 and slides, pushes away the lubricating oil that emerges in the oil groove 11 to arc recess 13 department simultaneously, and slider-arc 12 continues to slide, and shell fragment 14 is compressed, leaves shell fragment 14 back when slider-arc 12, and shell fragment 14 has been strutted, and in shell fragment 14 was strutted, shell fragment 14 splashes the lubricating oil of arc recess 13 to spin 5, has increased the area covered of lubricating oil to lubricated effect has been improved.

When the ball bearing is assembled, when the rotating shaft is extruded during the rotation of the inner ring 1, the rolling balls 6 in the vertical grooves at the outer side of the inner ring 1 are extruded, so that the rolling balls 6 continuously extrude the rolling body 3, and the displacement of the rolling balls 6 during the extrusion determines the swing amplitude of the rotating shaft in the inner ring 1; when the rolling ball 6 is pressed at the periphery of the inner ring 1, the rolling ball 6 enables the rotating plate 54 to rotate towards one side close to the rotating ring 51, so that the vibration generated in the pressing process is relieved, and after the rolling ball 6 leaves, the rotating ring 51 is reset under the action of the torsion spring; the rolling ball 6 presses the rotating plate 54 to rotate towards one side close to the rotating ring 51, the rolling ball 6 contacts the connecting rod 56 during rotation, and under the action of the connecting rod 56, the rolling ball 6 moves from the circular arc groove 55 at the upper end of the rotating plate 54 to the circular arc groove 55 at the lower end of the rotating plate 54, so that the rotating contact of the rolling body 3 and the rolling ball 6 at the same place for a long time is relieved; meanwhile, when the rolling ball 6 moves into the arc groove 55 at the lower end of the rotating plate 54, the rolling ball 6 resets the rolling ball 6 under the action of the steel wire 57; the rolling ball 6 moves back and forth in the arc-shaped groove 55, so that the rolling ball 6 pushes the arc-shaped sliding block 12 to slide back and forth in the vertical groove at the periphery of the inner ring 1, when the arc-shaped sliding block 12 leaves the opening of the oil groove 11, lubricating oil is emitted from the opening of the oil groove 11, and meanwhile, the arc-shaped sliding block 12 pushes the emitted lubricating oil to the position of the rolling ball 6 in sliding and lubricates the rolling ball 6, so that the abrasion of the rolling ball 6 is reduced; rolling ball 6 promotes slider-arc 12 and slides, pushes away the lubricating oil that emerges in oil groove 11 to arc recess 13 department simultaneously, and slider-arc 12 continues to slide, and shell fragment 14 is compressed, leaves shell fragment 14 back when slider-arc 12, and shell fragment 14 has been strutted, and in shell fragment 14 has been strutted, shell fragment 14 sputters arc recess 13's lubricating oil to rolling ball 5, has increased the area covered of lubricating oil to lubricated effect has been improved.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A method for improving chemical raw material stirring efficiency is characterized in that: the method comprises the following steps:

the ball bearing comprises an inner ring (1), an outer ring (2), a rolling body (3) and a first retainer (4); the method is characterized in that: the device also comprises a rotating device (5) and a rolling ball (6); the inner ring (1) is spherical, and the middle part of the inner ring (1) is provided with a mounting hole for mounting a shaft; the top and the bottom of the inner ring (1) are respectively provided with a rotating device (5);

the rotating device (5) comprises a rotating ring (51), a mounting seat (53) and a rotating plate (54); the outer ring of the rotating ring (51) is provided with a group of mounting seats (53); one end of the rotating plate (54) is rotatably arranged on the mounting seat (53) through a rotating shaft, and a torsion spring is arranged in the rotating shaft; the mounting seat (53) is connected with a rolling ball (6) through a telescopic rod (8); when the rolling ball (6) is pressed at the periphery of the inner ring (1), the rolling ball (6) enables the rotating plate (54) to rotate towards one side close to the rotating ring (51), so that the vibration generated in the pressing process is relieved, and after the rolling ball (6) leaves, the rotating plate (54) is reset under the action of the torsion spring;

one side of the rolling ball (6) is in contact with the rolling body (3), the other side of the rolling ball (6) is arranged in a vertical groove on the outer side of the inner ring (1), and a group of rolling balls (6) form a circular ring shape; two groups of circular rolling balls (6) are arranged on the periphery of the inner ring (1) through a second retainer (7); when the rotating shaft is extruded during the rotation of the inner ring (1), the rolling balls (6) in the vertical grooves at the outer side of the inner ring (1) are extruded, so that the rolling balls (6) continuously extrude the rolling body (3), and the displacement of the rolling balls (6) during the extrusion determines the swing amplitude of the rotating shaft in the inner ring (1);

one side of the rotating plate (54) is provided with a group of arc grooves (55) with the same arc length; the rolling ball (6) is positioned in the arc groove (55); the bottom of the arc groove (55) at the end of the rotating plate (54) is provided with a through hole; a connecting rod (56) fixedly connected with the rotating ring (51) is arranged in the through hole, and the connecting rod (56) is used for jacking the rolling ball (6); one side of the connecting rod (56) is provided with a steel wire (57) which is fixedly connected with the rotating ring (51), and the steel wire (57) passes through the through hole of the rotating plate (54) and is connected with the rolling ball (6); the rolling ball (6) presses the rotating plate (54) to rotate towards one side close to the rotating ring (51), the rolling ball (6) is contacted with the connecting rod (56) in the rotating process, and under the action of the connecting rod (56), the rolling ball (6) moves from the circular arc groove (55) at the upper end of the rotating plate (54) to the circular arc groove (55) at the lower end of the rotating plate (54), so that the rotating contact of the rolling body (3) and the rolling ball (6) at the same place for a long time is relieved; meanwhile, when the rolling ball (6) moves into the arc groove (55) at the lower end of the rotating plate (54), the rolling ball (6) resets the rolling ball (6) under the action of the steel wire (57);

a group of oil grooves (11) are symmetrically arranged in the inner part of the inner ring (1) from top to bottom, and lubricating oil for lubricating the rolling balls (6) is filled in the oil grooves (11); an arc-shaped sliding block (12) is arranged in a vertical groove of the rolling ball (6) arranged at the periphery of the inner ring (1) in a sliding manner; the arc-shaped sliding block (12) can block the opening of the oil groove (11);

the rolling ball (6) moves back and forth in the arc-shaped groove (55), so that the rolling ball (6) pushes the arc-shaped sliding block (12) to slide back and forth in the vertical groove at the periphery of the inner ring (1), when the arc-shaped sliding block (12) leaves the opening of the oil groove (11), lubricating oil overflows from the opening of the oil groove (11), and meanwhile, the arc-shaped sliding block (12) pushes the escaped lubricating oil to the position of the rolling ball (6) in the sliding process and lubricates the rolling ball (6), so that the abrasion of the rolling ball (6) is reduced;

two ends of the arc-shaped sliding block (12) are respectively provided with an arc-shaped groove (13) which is positioned in the vertical groove of the inner ring (1); elastic sheets (14) protruding outwards are arranged in the arc-shaped grooves (13), one ends of the elastic sheets (14) are fixedly connected inside the arc-shaped grooves (13), and the other ends of the elastic sheets (14) are suspended; the rolling ball (6) pushes the arc-shaped sliding block (12) to slide, meanwhile, lubricating oil emerging from the oil groove (11) is pushed to the arc-shaped groove (13), the arc-shaped sliding block (12) continues to slide, the elastic sheet (14) is compressed, when the arc-shaped sliding block (12) leaves the elastic sheet (14), the elastic sheet (14) is stretched, and in the stretching of the elastic sheet (14), the elastic sheet (14) splashes the lubricating oil in the arc-shaped groove (13) to the rolling ball (5), so that the coverage area of the lubricating oil is increased, and the lubricating effect is improved;

when the rolling mechanism works, when the rotating shaft is extruded during the rotation of the inner ring (1), the rolling balls (6) in the vertical grooves at the outer side of the inner ring (1) are extruded, so that the rolling balls (6) continuously extrude the rolling body (3), and the displacement of the rolling balls (6) during the extrusion determines the swing amplitude of the rotating shaft in the inner ring (1); when the rolling ball (6) is pressed at the periphery of the inner ring (1), the rolling ball (6) enables the rotating plate (54) to rotate towards one side close to the rotating ring (51), so that the vibration generated in the pressing process is relieved, and after the rolling ball (6) leaves, the rotating plate (54) is reset under the action of the torsion spring; the rolling ball (6) presses the rotating plate (54) to rotate towards one side close to the rotating ring (51), the rolling ball (6) is contacted with the connecting rod (56) in the rotating process, and under the action of the connecting rod (56), the rolling ball (6) moves from the circular arc groove (55) at the upper end of the rotating plate (54) to the circular arc groove (55) at the lower end of the rotating plate (54), so that the rotating contact of the rolling body (3) and the rolling ball (6) at the same place for a long time is relieved; meanwhile, when the rolling ball (6) moves into the arc groove (55) at the lower end of the rotating plate (54), the rolling ball (6) resets the rolling ball (6) under the action of the steel wire (57); the rolling ball (6) moves back and forth in the arc-shaped groove (55), so that the rolling ball (6) pushes the arc-shaped sliding block (12) to slide back and forth in the vertical groove at the periphery of the inner ring (1), when the arc-shaped sliding block (12) leaves the opening of the oil groove (11), lubricating oil overflows from the opening of the oil groove (11), and meanwhile, the arc-shaped sliding block (12) pushes the overflowed lubricating oil to the position of the rolling ball (6) in the sliding process and lubricates the rolling ball (6), so that the abrasion of the rolling ball (6) is reduced; rolling ball (6) promote curved sliding block (12) and slide, push away curved groove (13) department with the lubricating oil that emits in oil groove (11) simultaneously, curved sliding block (12) continue to slide, shell fragment (14) are compressed, leave shell fragment (14) back when curved sliding block (12), shell fragment (14) are strutted, in stretching of shell fragment (14), shell fragment (14) splash the lubricating oil of curved groove (13) to rolling ball (5), the coverage area of lubricating oil has been increased, thereby lubrication effect has been improved.