CN108655824B

CN108655824B - Indexing device

Info

Publication number: CN108655824B
Application number: CN201810286465.6A
Authority: CN
Inventors: 王臻; 薛小星; 刘风; 郭学杰; 吴红琼; 孟维文
Original assignee: Wuhan Marine Machinery Plant Co Ltd
Current assignee: Wuhan Marine Machinery Plant Co Ltd
Priority date: 2018-03-30
Filing date: 2018-03-30
Publication date: 2020-10-16
Anticipated expiration: 2038-03-30
Also published as: CN108655824A

Abstract

The invention discloses an indexing device, comprising: the locating plate, the graduated disk, pivot and graduation locking piece, be equipped with first pivot through-hole on the face of locating plate, along a plurality of graduation locating hole of first pivot through-hole circumference equipartition on the face of locating plate, be equipped with second pivot through-hole in the quotation of graduated disk, along a plurality of graduation hole of second pivot through-hole circumference equipartition in the quotation of graduated disk, graduation hole and graduation locating hole distribute with same diameter circumference, the locating plate rotationally overlaps through first pivot through-hole and establishes in the pivot, graduated disk fixed cover establishes in the pivot, graduation locking piece is used for the cartridge in graduation locating hole and graduation hole and blocks the pivot and rotate. The invention effectively improves the efficiency of indexing work and reduces the cost of indexing processing.

Description

Indexing device

Technical Field

The invention relates to the field of machining, in particular to an indexing device.

Background

Indexing is a mechanical process that divides a workpiece into arbitrary equal parts. In the field of machining, machining indexing is usually completed by means of a universal indexing head, a machine tool rotary table or manual scribing.

In the process of implementing the invention, the inventor finds that the prior art has at least the following problems:

the universal dividing head and the machine tool rotary table are complex in structure and high in use cost, and are commonly used for dividing work with high precision, while the manual scribing dividing mode has high requirement on the skill level of an operator, the dividing precision is difficult to guarantee, and the efficiency is low.

Disclosure of Invention

In order to improve the efficiency of the indexing work and reduce the cost, the embodiment of the invention provides an indexing device. The technical scheme is as follows:

the embodiment of the invention provides an indexing device, which comprises: the positioning plate is vertically fixed on the base, a first rotating shaft through hole is formed in the positioning plate, a second rotating shaft through hole is formed in the disc surface of the dividing disc, the rotating shaft is rotatably installed in the first rotating shaft through hole, and the rotating shaft penetrates through the second rotating shaft through hole of the dividing disc and is fixedly connected with the dividing disc; the positioning plate is uniformly distributed with a plurality of indexing positioning holes along the circumferential direction of the first rotating shaft through hole, the dial surface of the indexing dial is uniformly distributed with a plurality of indexing holes along the circumferential direction of the second rotating shaft through hole, the distance between any indexing hole and the second rotating shaft through hole is equal to the distance between any indexing positioning hole and the first rotating shaft through hole, and the indexing locking piece is inserted into the indexing positioning holes and the indexing holes at the same time and blocks the rotating shaft from rotating.

In an implementation manner of the embodiment of the invention, the rotating shaft is a stepped shaft, the stepped shaft comprises a first stepped shaft, a second stepped shaft and a third stepped shaft which are coaxially connected in sequence, the index plate is sleeved on the first stepped shaft, a shaft shoulder is arranged on the first stepped shaft, the shaft shoulder and the index plate are fixed through bolts, a bearing is sleeved on the second stepped shaft and fixed in the through hole of the first rotating shaft, and an anti-loosening element used for abutting against the positioning plate is arranged on the third stepped shaft.

In another implementation manner of the embodiment of the present invention, the locking member includes: the locking retainer ring is sleeved on the third stepped shaft, one end face of the locking retainer ring is abutted to the bearing, the locking nut is fixedly screwed into the third stepped shaft, and the nut of the locking nut is abutted to the other end face of the locking retainer ring.

In another implementation manner of the embodiment of the invention, the disk surface of the index disk is provided with an annular bulge, and the area from the annular bulge to the outer edge of the index disk is a workpiece mounting area.

In another implementation manner of the embodiment of the present invention, the indexing device further includes a workpiece fixing member, where the workpiece fixing member includes a plurality of pressing plates arranged at intervals along a circumferential direction of the annular protrusion, and the pressing plates are used to clamp the workpiece between the indexing disc and the pressing plates.

In another implementation manner of the embodiment of the present invention, the workpiece fixing element further includes: the limiting screw is inserted on the dividing plate, a limiting groove is formed in the pressing plate, and the limiting screw is located below the limiting groove.

In another implementation manner of the embodiment of the present invention, the position-limiting groove is disposed at an edge of the pressure plate, and a groove depth of the position-limiting groove gradually decreases from an outer edge of the pressure plate to a center of the pressure plate.

In another implementation manner of the embodiment of the present invention, the indexing device further includes a rotating rod, one end of the rotating rod is provided with a thread, the outer edge of the indexing plate is provided with screw holes radially distributed around the outer edge, and the rotating rod is installed in the screw holes.

In another implementation of the embodiment of the invention, the indexing lock comprises: the locking pin comprises a first plug pin part and a second plug pin part which are coaxially arranged, and the sectional area of the second plug pin part is larger than that of the second plug pin part in the length direction perpendicular to the locking pin.

In another implementation manner of the embodiment of the present invention, the indexing device further includes a fixing rib plate, one end of the fixing rib plate is fixed on the base, and the other end of the fixing rib plate is fixed on the positioning plate.

The technical scheme provided by the embodiment of the invention has the following beneficial effects:

in the embodiment of the invention, the first rotating shaft through hole is arranged on the positioning plate, so that the first rotating shaft through hole is sleeved on the rotating shaft and the positioning plate can rotate relative to the rotating shaft, meanwhile, the dividing disc is sleeved on the rotating shaft through the through hole of the second rotating shaft and fixed, the dividing disc can rotate along with the rotating shaft, because the indexing disc and the positioning plate are respectively provided with a plurality of indexing holes and indexing positioning holes which are uniformly distributed in the circumferential direction, and the indexing holes and the indexing positioning holes are uniformly distributed in the circumferential direction, that is, in the process of the rotation of the dividing plate, the dividing hole and the dividing positioning hole are overlapped, and the rotation of the two holes is performed by a certain angle when the two holes are overlapped once in rotation, so that the invention takes the rotating dividing hole as a metering unit, when the indexing disc rotates to the angle required by indexing work, the indexing locking piece is inserted into the indexing positioning hole and the indexing hole to fix the angle, so that the indexing work is realized.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic view of an assembly structure of an indexing device according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of an indexing device provided in FIG. 1;

FIG. 3 is a schematic structural diagram of a positioning plate according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an indexing table according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a rotating shaft according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a platen according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a limit screw according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a rotating rod according to an embodiment of the present invention;

FIG. 9 is a partial cross-sectional view taken along line A of an indexing device shown in FIG. 1;

FIG. 10 is a schematic structural diagram of an indexing lockout according to an embodiment of the present invention;

the symbols in the drawings represent the following meanings:

1-positioning plate, 11-first rotating shaft through hole, 12-indexing positioning hole, 2-indexing disc, 21-second rotating shaft through hole, 22-indexing hole, 23-annular bulge, 24-threaded hole, 3-rotating shaft, 31-first stepped shaft, 310-shaft shoulder, 32-second stepped shaft, 33-third stepped shaft, 4-locking pin, 41-first plug pin part, 42-second plug pin part, 51-locknut, 52-check ring, 6-bearing, 7-pressing plate, 70-mounting hole, 71-limiting groove, 8-limiting screw, 9-rotating rod and 10-base.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a schematic view of an assembly structure of an indexing device provided in an embodiment of the present invention, and fig. 2 is a cross-sectional view of the indexing device provided in fig. 1, as shown in fig. 1 and 2, the indexing device includes: base 10, locating plate 1, graduated disk 2, pivot 3 and graduation locking piece 4 (fig. 1 does not show), and locating plate 1 is vertical to be fixed on base 10, is equipped with first pivot through-hole 11 on the locating plate 1, is equipped with second pivot through-hole 21 on the quotation of graduated disk 2, and the rotatable installation of pivot 3 is in first pivot through-hole 11, and pivot 3 passes second pivot through-hole 21 and graduated disk 2 fixed connection of graduated disk 2.

A plurality of indexing positioning holes 12 are uniformly distributed on the positioning plate 1 along the circumferential direction of the first rotating shaft through hole 11, a plurality of indexing holes 22 are uniformly distributed on the surface of the indexing plate 2 along the circumferential direction of the second rotating shaft through hole 21, the distance between any indexing hole 22 and the second rotating shaft through hole 21 is equal to the distance between any indexing positioning hole 12 and the first rotating shaft through hole 11, and the indexing locking piece 4 is inserted into the indexing positioning holes 12 and the indexing holes 22 and blocks the rotating shaft 3 from rotating.

In the embodiment of the invention, the first rotating shaft through hole 11 is arranged on the positioning plate 1, so that the first rotating shaft through hole 11 is sleeved on the rotating shaft 3, the positioning plate 1 and the rotating shaft 3 can rotate relatively, the indexing disc 2 is sleeved on the rotating shaft 3 and fixed through the second rotating shaft through hole 21, the indexing disc 2 can rotate along with the rotating shaft 3, as the indexing disc 2 and the positioning plate 1 are respectively provided with a plurality of indexing holes 22 and indexing positioning holes 12 which are uniformly distributed in the circumferential direction, and the indexing holes 22 and the indexing positioning holes 12 are uniformly distributed in the circumferential direction, namely, in the rotating process of the indexing disc 2, the indexing holes 22 and the indexing positioning holes 12 are superposed, and a certain angle is passed when the two holes are superposed in rotation, the indexing disc 2 takes the rotating indexing holes 22 as a metering unit, when the indexing disc 2 rotates to the angle required by indexing work, the indexing piece 4 is inserted into the indexing positioning holes 12 and the indexing holes 22, and the angle is fixed, so that the indexing work is realized.

Fig. 3 is a schematic structural diagram of a positioning plate according to an embodiment of the present invention, and as shown in fig. 3, the positioning plate 1 is a disc structure, and a plurality of lightening holes (as shown in fig. 3) are arranged on a disc surface along a circumferential direction of the first through hole 11 of the rotating shaft, and the structure of the positioning plate 1 can be simplified by the lightening holes.

Fig. 4 is a schematic structural diagram of an indexing disc provided in an embodiment of the present invention, as shown in fig. 4, the indexing disc 2 is a circular disc structure with a size similar to that of the positioning plate 1, and the diameters of the two are different by no more than 10cm, in an embodiment of the present invention, an annular protrusion 23 is provided on the disc surface of the indexing disc 2, an area from the annular protrusion 23 to the outer edge of the indexing disc 2 is a workpiece mounting area, and the outer edge of the annular protrusion 23 abuts against an annular workpiece to be processed. Wherein the plane of the workpiece mounting area is spaced from the top surface of the annular projection 23 by a distance greater than the distance between the plane of the index plate 2 on the other side of the annular projection 23 and the top surface of the annular projection 23 (see fig. 2). Because the workpiece mounting area needs to bear the supporting force for the workpiece, the thickness of the area needs to be larger than that of the area of the dividing plate 2 except the annular protrusion 23 so as to ensure the stability and the safety of the dividing device, and meanwhile, because the thickness of the area except the workpiece mounting area is smaller, certain manufacturing cost can be reduced, and resources are saved.

Fig. 5 is a schematic structural diagram of a rotating shaft according to an embodiment of the present invention, as shown in fig. 5, the rotating shaft 3 is a stepped shaft, the stepped shaft includes a first stepped shaft 31, a second stepped shaft 32, and a third stepped shaft 33 that are coaxially connected in sequence, the index plate 2 is sleeved on the first stepped shaft 31, a shaft shoulder 310 is disposed on the first stepped shaft 31, the shaft shoulder 310 and the index plate 2 are fixed by bolts, a bearing 6 is sleeved on the second stepped shaft 32, the bearing 6 is fixed in the first rotating shaft through hole 11, and an anti-loosening member for abutting against the positioning plate 1 is disposed on the third stepped shaft 33. Set the step shaft with pivot 3, and locate the different positions of step shaft respectively with graduated disk 2 and locating plate 1, can prevent 2 rotation of graduated disk and produce mutual interference between the locating plate 1, and step shaft one end is equipped with shoulder 310, shoulder 310 passes through bolt and 2 fixed connection of graduated disk, install the anti-loosening piece on the third step shaft 33 of the other end, through anti-loosening piece and shoulder 310 with locating

plate

1 and 2 locks of graduated disk in pivot 3, prevent that indexing means from taking place not hard up, or the condition that drops, improve indexing means's stability.

As shown in fig. 5, the cross-sectional areas of the first stepped shaft 31, the second stepped shaft 32 and the third stepped shaft 33 are gradually reduced, a step is formed between each stepped shaft, each stepped shaft is divided, and the indexing plate 2 and the positioning plate 1 are conveniently mounted and positioned, wherein the first stepped shaft 31 and the second stepped shaft 32 are smooth-surfaced optical axes, and are convenient for the indexing plate 2 and the positioning plate 1 to be sleeved, and the outer surface of the third stepped shaft 33 is provided with threads, and can be used for mounting a fixing member (such as a nut) with threads, and the indexing plate 2 and the positioning plate 1 are fixed on the rotating shaft 3 through the fixing member.

As shown in fig. 2, the bearing 6 is installed in the first through hole 11, wherein the two ends of the first through hole 11 are provided with bearing grooves larger than the size of the first through hole 11, the bearing 6 is installed in the two bearing grooves, that is, 2 bearings 6 are arranged on the second stepped shaft 32, thereby ensuring the rotating effect.

In the embodiment of the present invention, the bearings 6 may be deep groove ball bearings 6, which are disposed at two ends of the first rotating shaft through hole 11, so that the rotation between the positioning plate 1 and the rotating shaft 3 is smoother by disposing the two deep groove ball bearings 6, and the abrasion between the positioning plate 1 and the rotating shaft 3 can be prevented, thereby ensuring the smooth operation of the indexing operation.

Specifically, the indexing device further comprises a workpiece fixing member, the workpiece fixing member comprises a pressure plate 7 mounted on the end face of the annular protrusion 23, the pressure plate 7 is of a long strip-shaped plate-shaped structure, a mounting hole 70 for inserting a bolt is formed in the middle of the pressure plate 7, and one side of the pressure plate 7 is an inclined surface which is consistent with the profile of the workpiece in shape and is convenient to attach to the workpiece and press the workpiece tightly.

Wherein both ends of the pressure plate 7 protrude from the annular protrusion 23. In the embodiment of the invention, the number of the pressing plates 7 is 8 (see fig. 1), the pressing plates are uniformly and circumferentially distributed on the index plate 2 by taking the circle center of the through hole 21 of the second rotating shaft as a reference, the workpiece is pressed on the index plate 2 through the inclined plane on the pressing plate 7, the inclined plane has the same profile as the profile of the surface of the workpiece, the workpiece rotates along with the index plate 2, the angle of the workpiece is changed, the indexing of the workpiece is realized, and meanwhile, the pressing plates 7 are fixed on the index plate 2 by using bolts, so that the workpiece is convenient to detach, and the indexing.

As shown in fig. 4, the annular protrusion 23 is provided with 8 threaded holes 24 for mounting the pressure plate 7 in addition to the indexing holes 22, and in the embodiment of the present invention, the threaded holes 24 need to be disposed between the indexing holes 22 to avoid that the threaded holes 24 and the indexing holes 22 are in the same plane in the radial direction, so as to prevent the indexing holes 22 from being shielded after the pressure plate 7 is mounted, and thus the indexing work cannot be performed.

As shown in fig. 2, the workpiece fixture further includes: the limiting screw 8 is inserted into the index plate 2, fig. 6 is a schematic structural view of a pressure plate according to an embodiment of the present invention, as shown in fig. 6, a limiting groove 71 is formed in the pressure plate 7, the limiting groove 71 is formed in the other side of the pressure plate 7 opposite to the inclined surface, the limiting screw 8 is located below the limiting groove 71 (see fig. 2), fig. 7 is a schematic structural view of a limiting screw according to an embodiment of the present invention, as shown in fig. 7, one end of the limiting screw 8 is spherical, and a spherical end of the limiting screw 8 is inserted into the limiting groove 71. In the embodiment of the present invention, the number of the limit screws 8 is 8, and the limit screws are arranged below 8 pressure plates 7 (see fig. 2), one end of each limit screw is inserted into the index plate 2, and the spherical end of each limit screw is inserted into the limit groove 71, so that the pressure plate 7 can be prevented from rotating after the pressure plate 7 is fixed on the index plate 2 through bolts, which results in unstable press mounting, and thus, accuracy of index work is affected.

As shown in fig. 2, the groove depth of the stopper groove 71 gradually decreases from the outer edge of the pressure plate 7 toward the center of the pressure plate 7. In the embodiment of the invention, the ball head end of the limit screw 8 can be propped against different positions in the limit groove 71 by adjusting the height of the limit screw 8 so as to adapt to workpieces with different thicknesses pressed by the pressure plate 7, when the workpiece is thicker, the limit screw 8 is inserted into the position with smaller depth in the limit groove 71, and when the workpiece is thinner, the limit screw 8 is inserted into the position with larger depth in the limit groove 71, so that the other side of the pressure plate 7 applies pressure to the workpiece. The position of the limiting screw 8 inserted into the limiting groove 71 can be flexibly adjusted to adapt to press mounting of workpieces with different thicknesses.

The number of the pressure plates and the number of the threaded holes in the embodiment of the present invention are exemplary, and may be increased or decreased according to actual conditions in application, and the embodiment of the present invention is not limited herein.

In an embodiment of the present invention, the locking member includes: locknut 51 and check ring 52, check ring 52 cover is established on third step axle 33, and a terminal surface of check ring 52 offsets with bearing 6, and locknut 51 fixes the screw in third step axle 33, and locknut 51's nut offsets with the other terminal surface of check ring 52. The bearing 6 is resisted by the anti-loose check ring 52, and the bearing 6 is prevented from being loosened by the mode that the bolt is resisted against the anti-loose check ring 52 indirectly to fix the bearing 6, on one hand, the bolt directly resists against the bearing 6 to cause abrasion to the bearing 6, on the other hand, because the contact area of the anti-loose check ring 52 and the bearing 6 which are abutted and attached is larger than that of the bolt, the effect of arranging the anti-loose check ring 52 to resist against the bearing 6 is better than that of using the bolt, and the stability of the. In the embodiment of the present invention, two locknuts 51 are provided, wherein one locknut 51 is used for abutting against the lockwasher 52, and the other locknut 51 is mounted on the third stepped shaft in an abutting manner with the previous locknut 51 for abutting against the previous locknut 51 to prevent the previous locknut 51 from loosening.

Fig. 8 is a schematic structural diagram of a rotating rod according to an embodiment of the present invention, and as shown in fig. 8, the indexing device further includes a rotating rod 9, one end of the rotating rod 9 is provided with a thread, the outer edge of the indexing disk 2 is provided with screw holes radially distributed around the outer edge, and the rotating rod 9 is installed in the screw holes. In the embodiment of the invention, 8 rotating rods 9 are respectively and uniformly distributed on the outer edge of the distribution disc in the circumferential direction, so that the indexing disc 2 can be conveniently shifted during indexing, and the convenience of the indexing device is improved.

Fig. 9 is a partial sectional view of an indexing device shown in fig. 1, taken along the direction a, and fig. 10 is a schematic structural view of an indexing lock member according to an embodiment of the present invention, and as shown in fig. 9 and 10, the indexing lock member includes: the locking pin 4 comprises a first plug pin part 41 and a second plug pin part 42 which are coaxially arranged, and the sectional area of the second plug pin part 42 is larger than that of the first plug pin part 41 in the direction perpendicular to the length direction of the locking pin 4. According to the invention, the locking pin 4 is divided into the first plug pin part 41 and the second plug pin part 42, and the sectional area of the second plug pin part 42 is larger than that of the first plug pin part 41, so that when the locking pin 4 is inserted into the indexing positioning hole 12 and the indexing hole 22 to fix an indexing angle, only the first plug pin part 41 is inserted into the indexing hole 22 and the indexing positioning hole 12, on one hand, the relative rotation between the index plate 2 and the positioning plate 1 is limited, and the precision is interfered, and on the other hand, the second plug pin part 42 is left outside the hole, so that the indexing locking piece 44 can be pulled out conveniently.

As shown in fig. 2 and 3, the indexing device further comprises a fixed rib plate, a positioning plate 1 is vertically fixed on the base 10, one end of the fixed rib plate is fixed on the base 10, and the other end of the fixed rib plate is fixed on the positioning plate 1. The base 10, the fixed rib plates and the positioning plate 1 form a stable triangular structure, so that the stability of the indexing device is improved.

When the indexing device provided by the embodiment of the invention is used for indexing, firstly, a workpiece is pressed on the indexing disc 2 through the pressing plate 7, the pressing plate 7 is fixed through the bolt, then the rotating rod 9 is shifted, the indexing disc 2 drives the workpiece to rotate and index a required angle, the angle can be determined according to the number of the rotated indexing holes 22, and each indexing hole 22 represents a fixed angle value.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An indexing device, characterized in that the indexing device comprises: the positioning plate is vertically fixed on the base, a first rotating shaft through hole is formed in the positioning plate, a second rotating shaft through hole is formed in the disc surface of the dividing disc, the rotating shaft is rotatably installed in the first rotating shaft through hole, and the rotating shaft penetrates through the second rotating shaft through hole of the dividing disc and is fixedly connected with the dividing disc;

a plurality of indexing positioning holes are uniformly distributed on the positioning plate along the circumferential direction of the first rotating shaft through hole, a plurality of indexing holes are uniformly distributed on the disc surface of the indexing disc along the circumferential direction of the second rotating shaft through hole, the distance between any indexing hole and the second rotating shaft through hole is equal to the distance between any indexing positioning hole and the first rotating shaft through hole, and the indexing locking piece is used for being simultaneously inserted into the indexing positioning holes and the indexing holes and blocking the rotating shaft from rotating,

the disk surface of the indexing disk is provided with an annular bulge, the area from the annular bulge to the outer edge of the indexing disk is a workpiece mounting area, the thickness of the workpiece mounting area is greater than that of the area of the indexing disk except the annular bulge,

the indexing device further comprises a workpiece fixing member, the workpiece fixing member comprises a plurality of pressing plates which are arranged along the circumferential direction of the annular protrusion at intervals, the pressing plates are used for clamping the workpiece between the indexing disc and the pressing plates, and the workpiece fixing member further comprises: the limiting screw is inserted on the dividing plate, the pressing plate is provided with a limiting groove, the limiting screw is positioned below the limiting groove, one end of the limiting screw is spherical, the spherical end of the limiting screw is inserted in the limiting groove, the dividing plate is provided with a screw hole and a nut on the side surface facing the pressing plate, the screw hole is coaxial with the nut, the nut is fixedly arranged on the side surface of the dividing plate, the limiting screw is in threaded connection with the screw hole and the nut, the limiting groove is arranged on the edge of the pressing plate, the groove depth of the limiting groove is gradually reduced from the outer edge of the pressing plate to the center of the pressing plate, when the workpiece is thick, the limiting screw is inserted in the position with smaller groove depth of the limiting groove, when the workpiece is thin, the limiting screw is inserted in the position with larger groove depth of the limiting groove,

the rotating shaft is a stepped shaft, the stepped shaft comprises a first stepped shaft, a second stepped shaft and a third stepped shaft which are coaxially connected in sequence, the dividing plate is sleeved on the first stepped shaft, a shaft shoulder is arranged on the first stepped shaft, the shaft shoulder and the dividing plate are fixed through bolts, a bearing is sleeved on the second stepped shaft and fixed in the through hole of the first stepped shaft, an anti-loosening element used for abutting against the positioning plate is arranged on the third stepped shaft,

bearing grooves with the size larger than that of the first rotating shaft through hole are formed in the two ends of the first rotating shaft through hole, the two bearing grooves are distributed at intervals along the axial direction of the first rotating shaft through hole, the two bearing grooves are provided with the bearings, the bearings are deep groove ball bearings,

the indexing device further comprises a rotating rod, threads are arranged at one end of the rotating rod, screw holes distributed radially around the outer edge are formed in the outer edge of the indexing disc, and the rotating rod is installed in the screw holes.

2. The indexing device of claim 1, wherein the anti-loosening element comprises: the locking retainer ring is sleeved on the third stepped shaft, one end face of the locking retainer ring is abutted to the bearing, the locking nut is fixedly screwed into the third stepped shaft, and the nut of the locking nut is abutted to the other end face of the locking retainer ring.

3. The indexing device of claim 1 or 2, wherein the indexing lock comprises: the locking pin comprises a first plug pin part and a second plug pin part which are coaxially arranged, and the sectional area of the second plug pin part is larger than that of the first plug pin part in the length direction perpendicular to the locking pin.

4. The indexing device according to claim 1 or 2, further comprising a fixing rib plate, wherein one end of the fixing rib plate is fixed on the base, and the other end of the fixing rib plate is fixed on the positioning plate.