CN108581840B - Swing aligning structure for feeding circular arc track - Google Patents

Abstract

The invention discloses a swing aligning structure for feeding an arc track, which comprises a fan-shaped swing rotary table and a cross aligning sliding table. The fan-shaped swinging rotary table comprises a base, a fan-shaped swinging plate, a radial rolling support assembly, an outer axial rolling support assembly, an inner axial rolling support assembly and a bearing swinging rotary driving part. The sector swing rotary table is arranged on a lathe bed or a carriage of the grinding machine, the cross aligning sliding table is arranged on the sector swing rotary table, and the cross aligning sliding table is provided with a workpiece headstock or a grinding carriage. The ball bearing ring groove grinding machine provided with the swing aligning structure has the capability of enabling a workpiece to swing reciprocally around the groove arc curvature center or a grinding wheel to swing reciprocally around the forming arc curvature center so as to realize arc track feeding, and profile errors are transmitted in an arc constraint manner between the grinding wheel and the workpiece in the grinding process, so that the profile accuracy of the ball bearing ring groove arc can be effectively ensured.

Description

A swing centering structure for arc trajectory feeding

Technical field

The invention relates to a swing alignment structure used for forming and grinding arc trajectory feed of ball bearing ring channels, and belongs to the technical field of precision machining of rolling bearing rings.

Background technique

As an important basic component, ball bearings play a vital role in mechanical equipment. The working accuracy, performance, lifespan, reliability and other indicators of various mainframes in equipment manufacturing, aerospace, military industry and other fields are closely related to the performance of ball bearings.

The geometric accuracy of the ferrule channel (dimensional accuracy, profile accuracy and position accuracy) and the geometric characteristics of the channel surface (surface roughness and surface waviness, etc.) directly affect the rotation accuracy, vibration and noise of the ball bearing. At present, the final processing process of ball bearing ring channels is mainly super-finishing. Due to the weak rigidity of the process system, super-finishing processing is not sensitive to shape and position accuracy like other finishing processes, which is mainly reflected in the weak ability to correct channel profile errors and position errors in the previous process.

Plunge-cut grinding of ball bearing ring grooves has good process system rigidity and can achieve high position accuracy. However, due to the unconstrained transmission of profile errors between the grinding wheel and the workpiece, it is difficult to ensure the profile accuracy of the channel.

Since the profile of the ring channel is strongly constrained by the swing and rotation motion of the workpiece, the swing grinding of the ball bearing ring channel has a high precision of the ring channel profile. The early swing head groove grinder can achieve swing grinding of ball bearing ring grooves, but the 360° axial support of its swing rotary table does not match the smaller swing angle, causing the grinding wheel frame to overhang, affecting the process. System stiffness.

Contents of the invention

In view of the problems existing in the prior art, the present invention provides a swing alignment structure for arc trajectory feeding. A ball bearing ring channel grinder equipped with the swing alignment structure of the present invention has a workpiece arc around its channel. The center of curvature or the ability of the grinding wheel to reciprocate around its formed arc curvature center to achieve arc trajectory feed. During the grinding process, the profile error is transmitted through arc constraints between the grinding wheel and the workpiece, which can effectively ensure the groove of the ball bearing ring. The profile accuracy of the arc.

In order to overcome the problems of the existing technology, the present invention provides a swing alignment structure for arc trajectory feeding, which includes a sector-shaped swing rotary table and a cross-aligning slide table; the sector-shaped swing rotary table includes a base, which extends from the outer axis to the An axial rolling support assembly composed of a rolling support assembly and an inner axial rolling support assembly, a fan-shaped swing plate, a radial rolling support assembly and a bearing swing rotation drive component; the base is installed on the grinder bed or carriage; the outer The axial rolling support assembly includes an outer closed-loop boss arranged on the upper surface of the base and an outer closed-loop groove arranged on the lower surface of the fan-shaped swing plate. There is an outer closed-loop boss between the outer closed-loop boss and the outer closed-loop groove. set of balls; the inner axial rolling support assembly includes an inner closed-loop boss provided on the upper surface of the base and an inner closed-loop groove provided on the lower surface of the fan-shaped swing plate, the inner closed-loop boss and the inner closed-loop groove A set of balls is provided between the grooves; the output shaft of the bearing swing rotation driving component is connected to the sector-shaped swing plate through the radial rolling support assembly, and is used to drive the sector-shaped swing plate around the sector-shaped swing turntable. The rotation axis O ₁ O ₂ performs swing rotation motion; the cross-aligning slide table includes a lower slide table and an upper slide table, the base of the lower slide table is fixed to the sector-shaped swing plate, and the upper slide table is connected to the workpiece headstock or The grinding wheel frame is fixed; the positions of the upper sliding table and the lower sliding table of the cross-aligning sliding table are adjusted so that the center of curvature of the channel arc O within the horizontal axis section of the workpiece on the workpiece headstock or within the horizontal axis section of the grinding wheel on the grinding wheel frame The center of curvature of the formed arc coincides with the rotation axis O ₁ O ₂ of the sector-shaped swing rotary table; the bearing swing rotation drive component drives the sector-shaped swing plate and the cross-aligning slide table and workpiece headstock or grinding wheel on it The frame performs a swing rotation motion around the rotation axis O ₁ O ₂ of the sector-shaped swing rotary table to realize feeding along the channel arc trajectory of the workpiece or the grinding wheel forming arc trajectory; the outer axial rolling support assembly and the inner axial rolling support assembly The rolling support assembly jointly plays an axial rolling supporting role for the sector-shaped swing plate and the cross-aligning sliding table.

Furthermore, the present invention is a swing alignment structure for arc trajectory feeding, wherein the cross-section of the outer closed-loop groove is a scanning surface, and the scanning path of the scanning surface is a line starting from the first outer arc. segment, the first inner arc segment and the first end transition segments on both sides are sequentially tangent to form a closed curve at the end points. The centers of the first outer arc segment and the second inner arc segment are at On the rotation axis O ₁ O ₂ of the sector-shaped swing rotary table; the scanning profile of the scanning surface is a continuous arc or discontinuous centering on a circle with a curvature radius equal to that of the balls of the outer axial rolling support assembly. Arc or V-shaped line segment; the upper surface of the base is provided with an outer closed ring boss, and the outer closed ring boss includes a first outer arc boss, a first inner arc boss and first ends on both sides The first outer arc boss is higher in height than the first inner arc boss and the first end bosses on both sides, and is between the first outer arc boss and the first end boss. The junction of the first end boss smoothly transitions to the first end boss.

When the balls of the outer axial rolling support assembly are located on the first outer arc boss, the ball center of the balls is on the center line of the outer closed ring groove. At this time, the balls are in the axial direction. Rolling support state; when the ball is located on the first inner arc boss and the first end boss on both sides, the center of the ball is lower than the center line of the outer closed-loop groove in height. , at this time, the balls are in a circulating state to ensure the continuity of axial rolling support.

The cross-section of the inner closed-loop groove is a scanning surface, and the scanning path of the scanning surface is a line consisting of a second outer arc segment, a second inner arc segment and second end transition segments on both sides, each at the end point. A closed curve formed by sequential tangency, the center of the second outer arc segment and the second inner arc segment is on the rotation axis O ₁ O ₂ of the sector-shaped swing rotary table. The scanning profile of the scanning surface is a continuous arc or a discontinuous arc or a V-shaped polyline segment centered on a circle with a radius of curvature equal to that of the balls of the inner axial rolling support assembly; the upper part of the base The surface is provided with an inner closed-loop boss. The inner closed-loop boss includes a second outer arc boss, a second inner arc boss and second end bosses on both sides. The second inner arc boss Higher in height than the second outer arc boss and the second end bosses on both sides, and at the junction of the second inner arc boss and the second end boss toward the second Smooth transition of end bosses.

When the balls of the inner axial rolling support assembly are located on the second inner arc boss, the ball center of the balls is on the center line of the inner closed ring groove. At this time, the balls are in the axial direction. Rolling support state; when the ball is located on the second outer arc boss and the second end boss on both sides, the center of the ball is lower than the center line of the inner closed-loop groove in height. , at this time, the balls are in a circulating state to ensure the continuity of axial rolling support.

Compared with the prior art, the beneficial effects of the present invention are:

The ball bearing ring channel grinder equipped with the swing aligning structure of the present invention has the workpiece bypassing the center of channel arc curvature in the horizontal axis section and an axis perpendicular to the horizontal axis section or the grinding wheel bypassing the horizontal axis section. The center of curvature of the formed arc within the center and the axis perpendicular to the horizontal axis section can swing back and forth to achieve arc trajectory feed. During the grinding process, the profile error is transmitted through arc constraints between the grinding wheel and the workpiece, which can effectively Ensure the profile accuracy of the ball bearing ring channel arc.

Description of the drawings

Figure 1 is an exploded schematic diagram of a swing alignment structure for arc trajectory feeding according to the present invention;

Figure 2 is a schematic structural diagram of the radial rolling support assembly shown in Figure 1;

Figure 3 is an exploded schematic diagram of the structure of the axial rolling support assembly in the present invention;

Figure 4-1 is a schematic diagram of the closed-loop groove structure on the fan-shaped swing plate of the present invention;

Figure 4-2 is a cross-sectional view of structure 1 of section A-A in Figure 4-1;

Figure 4-3 is a cross-sectional view of structure two of section A-A in Figure 4-1;

Figure 4-4 is a cross-sectional view of structure three of section A-A in Figure 4-1;

Figure 5 is a schematic structural diagram of the closed-loop boss in the axial rolling support assembly of the present invention;

Figure 6 is a schematic diagram of the contact path between the balls and the closed-loop boss in the axial rolling support assembly of the present invention;

Figure 7 is a cross-sectional view of the axial rolling support assembly of the present invention;

Figure 8 is a schematic structural diagram of a headstock with a swing alignment structure for arc trajectory feeding according to the present invention;

Figure 9 is a schematic diagram of the offset position before centering of a swing centering structure used for arc trajectory feeding according to the present invention;

Figure 10 is a schematic diagram of the overlapping position after alignment of a swing alignment structure used for arc trajectory feeding according to the present invention.

In the picture:

1-Sector-shaped swing turntable;

11-Bearing swing rotation drive component, 111-Output shaft;

12-base;

13-inner axial rolling support component, 131-inner closed-loop groove, 132-ball, 133-inner closed-loop boss, 1331-second outer arc boss, 1332-second inner arc boss, 1333-th Two end bosses, 134-inner closed-loop boss contact path, 1341-outer arc contact path, 1342-end transition contact path area, 1343-inner arc contact path;

14-External axial rolling support component, 141-External closed ring groove, 142-Balls, 143-External closed ring boss, 1431-First outer arc boss, 1432-First inner arc boss, 1433-No. One end boss, 144-outer closed-loop boss contact path, 1441-outer arc contact path, 1442-end transition contact path area, 1443-inner arc contact path;

15-sector-shaped swing plate, 151-outer closed-loop groove scanning path, 1511-first outer arc segment, 1512-first inner arc segment, 1513-first end transition section, 152-inner closed-loop trench scanning path , 1521-the second outer arc section, 1522-the second inner arc section, 1523-the second end transition section;

16-radial rolling support assembly, 161-deep groove ball bearing, 162-shaft sleeve, 1621-shaft sleeve inner cylindrical surface, 163-swing shaft;

2-cross-aligning slide, 21-lower slide, 211-base of the lower slide, 22-upper slide;

3-Pull;

4-Workpiece headstock;

5-workpiece;

O-the center of curvature of the channel arc, O ₁ O ₂ -the rotation axis of the sector-shaped swing rotary table, O ₃ O ₄ -the axis of the outer cylindrical surface of the workpiece.

Detailed ways

The technical solution of the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. The described specific embodiments only illustrate the present invention and are not intended to limit the present invention.

The present invention proposes a swing alignment structure for arc trajectory feeding, as shown in Figure 1, including a sector-shaped swing rotary table 1 and a cross-alignment slide table 2.

As shown in Figure 1, the sector-shaped swing rotary table 1 includes a base 12, an axial rolling support component composed of an outer axial rolling support component 14 and an inner axial rolling support component 13, a sector-shaped swing plate 15, and a radial rolling support component. Assembly 16 and bearing swing rotation drive member 11.

As shown in Figure 2, the base 12 is installed on the carriage 3 (or grinder bed), and the output shaft 111 of the swing rotation drive component 11 fixedly connected to the base 12 passes through the radial rolling support assembly. The swing shaft 163 of 16 is connected to the sector-shaped swing plate 15 and is used to drive the sector-shaped swing plate 15 to swing and rotate around the rotation axis O ₁ O ₂ of the sector-shaped swing turntable 1 . The radial rolling support assembly 16 includes a sleeve 162 fixedly connected to the base 12 , a swing shaft 163 fixedly connected to the sector-shaped swing plate 15 and a pair of deep groove ball bearings 161 . The axis O ₁ O ₂ of the cylindrical surface 1621 is the swing rotation axis of the sector-shaped swing turntable 1 .

As shown in FIG. 3 , the outer axial rolling support assembly 14 includes an outer closed-loop boss 143 provided on the upper surface of the base 12 , an outer closed-loop groove 141 provided on the lower surface of the sector-shaped swing plate 15 and a A set of balls 142 is between the outer closed-loop boss 143 and the outer closed-loop groove 141 . The inner axial rolling support assembly 13 includes an inner closed-loop boss 133 provided on the upper surface of the base 12 , an inner closed-loop groove 131 provided on the lower surface of the sector-shaped swing plate 15 , and an inner closed-loop boss 133 disposed on the upper surface of the base 12 . 133 and the inner closed-loop groove 131 between a set of balls 132 .

As shown in Figure 4-1, the cross-section of the outer closed-loop groove 141 is a scanning plane, and the scanning path 151 of the scanning plane is a line consisting of a first outer arc segment 1511, a first inner arc segment 1512 and two The first end transition sections 1513 on each side are sequentially tangent to form a closed curve at the end points. The centers of the first outer arc section 1511 and the second inner arc section 1512 are at the center of the sector-shaped swing turntable 1 On the rotation axis O ₁ O ₂ ; the scanning profile of the scanning surface is a V-shaped line segment centered on a circle with a curvature radius equal to the ball 142 of the outer axial rolling support assembly 14, as shown in Figure 4-4 , (either a continuous arc as shown in Figure 4-2 or an intermittent arc as shown in Figure 4-3), the center locus of the circle is defined as the center line of the outer closed-loop groove 141.

As shown in Figure 5, the upper surface of the base 12 is provided with an outer closed ring boss 143. The outer closed ring boss 143 includes a first outer arc boss 1431, a first inner arc boss 1432 and two sides. The first end boss 1433. The first outer arc boss 1431 is higher in height than the first inner arc boss 1432 and the first end bosses 1433 on both sides, and is located on the first end boss 1433. The junction between an outer arc boss 1431 and the first end boss 1433 smoothly transitions to the first end boss 1433 .

As shown in FIG. 6 , a set of balls 142 is provided between the outer closed ring boss 143 and the outer closed ring groove 141 ; when the balls 142 of the outer axial rolling support assembly 14 are located on the outer closed ring boss 143 , the contact path 144 between the ball 142 and the outer closed-loop boss 143 consists of an outer arc contact path 1441 located on the outer arc boss 1431 and an inner arc contact path located on the inner arc boss 1432 1443 and the two-side end transition contact path areas 1442 located on the two-side end bosses 1433 connecting the outer arc contact path 1441 and the inner arc contact path 1443.

As shown in Figure 7, when the ball 142 of the outer axial rolling support assembly 14 is located on the first outer arc boss 1431, the center of the ball 142 is at the center line of the outer closed ring groove 141. at this time, the ball 142 is in an axial rolling support state; when the ball 142 is located on the first inner arc boss 1432 and the first end bosses 1433 on both sides, the ball 142 The center of the ball is lower in height than the center line of the outer closed-loop groove 141. At this time, the balls 142 are in a circulating state to ensure the continuity of axial rolling support.

As shown in Figure 4-1, the cross-section of the inner closed-loop groove 131 is a scanning plane, and the scanning path 152 of the scanning plane is a line consisting of a second outer arc segment 1521, a second inner arc segment 1522 and two The second end transition sections 1523 on each side are sequentially tangent to form a closed curve at the end points. The center of the second outer arc section 1521 and the second inner arc section 1522 is at the center of the sector-shaped swing turntable 1 On the rotation axis O ₁ O ₂ . The scanning profile of the scanning surface is a V-shaped broken line segment centered on a circle with a curvature radius equal to the ball 132 of the inner axial rolling support assembly 13, as shown in Figure 4-4 (or Figure 4- 2 or the intermittent arc as shown in Figure 4-3)), the center locus of the defined circle is the center line of the inner closed-loop groove 131.

As shown in Figure 5, the inner closed ring boss 133 provided on the upper surface of the base 12 includes a second outer arc boss 1331, a second inner arc boss 1332 and second end bosses 1333 on both sides. The second inner arc boss 1332 is higher in height than the second outer arc boss 1331 and the second end bosses 1333 on both sides, and is between the second inner arc boss 1332 and the second end boss 1333 . The junction of the two end bosses 1333 smoothly transitions to the second end boss 1333 .

As shown in Figure 6, the ball 132 of the inner axial rolling support assembly 13 is disposed between the inner closed ring boss 133 and the inner closed ring groove 131. When the ball 132 is located on the inner closed ring boss 133, , the contact path 134 between the ball 132 and the inner closed-loop boss 133 consists of an outer arc contact path 1341 located on the outer arc boss 1331 and an inner arc located on the inner arc boss 1332 The contact path 1343 is composed of two end transition contact path areas 1342 located on the end bosses 1333 connecting the outer arc contact path 1341 and the inner arc contact path 1343 .

As shown in FIG. 7 , when the ball 132 of the inner axial rolling support assembly 13 is located on the second inner arc boss 1332 , the center of the ball 132 is at the center line of the inner closed ring groove 131 At this time, the ball 132 is in an axial rolling support state; when the ball 132 is located on the second outer arc boss 1331 and the second end boss 1333 on both sides, the ball 132 The center of the ball is lower in height than the center line of the inner closed-loop groove 131. At this time, the balls 132 are in a circulating state to ensure the continuity of axial rolling support.

The output shaft 111 of the bearing swing rotation driving component 11 is connected to the sector-shaped swing plate 15 through the radial rolling support assembly 16 and is used to drive the sector-shaped swing plate 15 around the rotation axis of the sector-shaped swing rotary table 1 O ₁ O ₂ performs swing and rotation motion.

As shown in Figure 8, the cross-aligning slide 2 includes a lower slide 21 and an upper slide 22. The base 211 of the lower slide 21 is fixed to the sector-shaped swing plate 15. The upper slide 22 is connected to the workpiece head. The frame 4 or the grinding wheel frame is fixed; as shown in Figures 9 and 10, by adjusting the positions of the upper sliding table 22 and the lower sliding table 21 of the cross-aligning sliding table 2, the workpiece 5 on the workpiece headstock 4 can be within the horizontal axis section. The channel arc curvature center O (or the formed arc curvature center in the horizontal axis section of the grinding wheel on the grinding wheel frame) coincides with the rotation axis O ₁ O ₂ of the sector-shaped swing rotary table 1. In the figure, O ₃ O ₄ is On the axis of the outer cylindrical surface of the workpiece, the bearing swing rotation drive component 11 drives the sector-shaped swing plate 15 and the cross-aligning slide 2 on it and the workpiece headstock 4 (or grinding wheel frame) around the sector-shaped swing rotary table 1 The rotation axis O ₁ O ₂ performs a swing rotation motion to realize feeding along the channel arc trajectory of the workpiece 5 (or the grinding wheel forming arc trajectory).

In the present invention, the outer axial rolling support assembly 14 and the inner axial rolling supporting assembly 13 jointly play an axial rolling supporting role for the sector-shaped swing plate 15 and the cross-aligning sliding table 2 .

Although the present invention has been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are only illustrative and not restrictive. Those of ordinary skill in the art will not Under the inspiration of the present invention, many modifications can be made without departing from the spirit of the present invention, and these all fall within the protection of the present invention.

Claims (3)

1. The swing aligning structure for feeding the arc track comprises a fan-shaped swing rotary table (1) and a cross aligning sliding table (2); it is characterized in that the method comprises the steps of,

the fan-shaped swing rotary table (1) comprises a base (12), an axial rolling support assembly formed by an outer axial rolling support assembly (14) and an inner axial rolling support assembly (13), a fan-shaped swing plate (15), a radial rolling support assembly (16) and a bearing swing rotary driving part (11);

the base (12) is arranged on the grinder bed or the carriage (3); the outer axial rolling support assembly (14) comprises an outer closed-loop boss (143) arranged on the upper surface of the base (12) and an outer closed-loop groove (141) arranged on the lower surface of the fan-shaped swinging plate (15), and a group of balls (142) are arranged between the outer closed-loop boss (143) and the outer closed-loop groove (141); the inner axial rolling support assembly (13) comprises an inner closed-loop boss (133) arranged on the upper surface of the base (12) and an inner closed-loop groove (131) arranged on the lower surface of the fan-shaped swinging plate (15), and a group of balls (132) are arranged between the inner closed-loop boss (133) and the inner closed-loop groove (131); the output shaft (111) of the bearing swing rotation driving part (11) is connected with the sector swing plate (15) through the radial rolling support assembly (16) and is used for driving the sector swing plate (15) to rotate around the rotation axis O of the sector swing rotary table (1) ₁ O ₂ Performing swinging and rotary motion;

the cross section of the outer closed loop groove (141) is a scanning surface, the scanning path (151) of the scanning surface is a closed curve formed by sequentially tangent to a first outer circular arc section (1511), a first inner circular arc section (1512) and first end transition sections (1513) at two sides at end points, the circle centers of the first outer circular arc section (1511) and the first inner circular arc section (1512) are positioned at the rotation axis O of the fan-shaped swing rotary table (1) ₁ O ₂ Applying; the scanning profile of the scanning surface is a continuous arc or a discontinuous arc or a V-shaped line segment centering a circle with the radius of curvature equal to that of the balls (142) of the outer axial rolling support assembly (14);

the outer closed loop boss (143) comprises a first outer arc boss (1431), a first inner arc boss (1432) and first end bosses (1433) at two sides, wherein the first outer arc boss (1431) is higher than the first inner arc boss (1432) and the first end bosses (1433) at two sides in height, and smoothly transits to the first end bosses (1433) at the junction of the first outer arc boss (1431) and the first end bosses (1433);

the cross section of the inner closed loop groove (131) is a scanning surface, the scanning path (152) of the scanning surface is a closed curve formed by sequentially tangent two by two at the end points of a second outer circular arc section (1521), a second inner circular arc section (1522) and second end transition sections (1523) at two sides, and the circle centers of the second outer circular arc section (1521) and the second inner circular arc section (1522) are positioned at the rotation axis O of the fan-shaped swing rotary table (1) ₁ O ₂ Applying; the scanning profile of the scanning surface is a continuous arc or a discontinuous arc or a V-shaped line segment centering a circle with the radius of curvature equal to that of the ball (132) of the inner axial rolling support assembly (13);

the inner closed loop boss (133) comprises a second outer circular arc boss (1331), a second inner circular arc boss (1332) and second end bosses (1333) on two sides, wherein the second inner circular arc boss (1332) is higher than the second outer circular arc boss (1331) and the second end bosses (1333) on two sides in height and smoothly transits to the second end bosses (1333) at the juncture of the second inner circular arc boss (1332) and the second end bosses (1333);

the cross aligning sliding table (2) comprises a lower sliding table (21) and an upper sliding table (22), a base (211) of the lower sliding table (21) is fixed with the sector-shaped swinging plate (15), and the upper sliding table (22) is fixed with the workpiece headstock (4) or the grinding carriage;

the positions of an upper sliding table (22) and a lower sliding table (21) of the cross aligning sliding table (2) are adjusted to enable a channel arc curvature center O in a horizontal shaft section of a workpiece (5) on a workpiece headstock (4) or a forming arc curvature center in a horizontal shaft section of a grinding wheel on a grinding wheel frame and a rotation axis O of the fan-shaped swing rotary table (1) ₁ O ₂ Overlapping;

the bearing swing rotation driving part (11) drives the sector swing plate (15), and the cross aligning sliding table (2) and the workpiece headstock (4) on the sector swing plate) Or the grinding carriage swings the rotation axis O of the rotary table (1) around the sector ₁ O ₂ Swinging and rotating movement is carried out to realize feeding along a channel arc track or a grinding wheel forming arc track of the workpiece (5);

the outer axial rolling support assembly (14) and the inner axial rolling support assembly (13) jointly play an axial rolling support role on the sector swinging plate (15) and the cross aligning sliding table (2).

2. The swing aligning structure for circular arc track feeding according to claim 1, characterized in that when the balls (142) of the outer axial rolling support assembly (14) are located on the first outer circular arc boss (1431), the centers of the balls (142) are on the center line of the outer closed loop groove (141), and at this time, the balls (142) are in an axial rolling support state; when the balls (142) are positioned on the first inner circular arc boss (1432) and the first end bosses (1433) on two sides, the center of the balls (142) is lower than the center line of the outer closed-loop groove (141) in height, and at the moment, the balls (142) are in a circulating state so as to ensure the continuity of axial rolling support.

3. A swing aligning structure for circular arc track feeding according to claim 1, characterized in that when the balls (132) of the inner axial rolling support assembly (13) are located on the second inner circular arc boss (1332), the centers of the balls (132) are on the center line of the inner closed loop groove (131), and at this time, the balls (132) are in an axial rolling support state; when the balls (132) are positioned on the second outer arc boss (1331) and the second end bosses (1333) on the two sides, the center of the balls (132) is lower than the center line of the inner closed-loop groove (131) in height, and at the moment, the balls (132) are in a circulating state so as to ensure the continuity of axial rolling support.