阅读说明：本技术 棘轮棘爪锁紧的数控分度台 (Numerical control indexing table locked by ratchet wheel and pawl ) 是由 刘喜平 黄世军 杨育林 于 2019-10-29 设计创作，主要内容包括：本发明提供一种棘轮棘爪锁紧的数控分度台,其包括涡轮蜗杆组件、棘轮棘爪组件和分度台组件,涡轮蜗杆组件,包括分度蜗轮、分度蜗杆、行星减速器和伺服电机,分度蜗轮的中央设有圆柱孔,分度蜗轮的中央圆柱孔和分度轴的中部固连。棘轮棘爪组件,包括锁紧棘爪、锁紧棘轮、丝杠、挡圈、螺母、锁紧手柄、销轴、U型叉架和自润滑轴套,自润滑轴套为工字形回转体结构,螺母为T字形回转体结构,挡圈是一个带有中央圆柱通孔的圆盘,U型叉架由底板和立板构成,U型叉架的立板上设有圆柱通孔,锁紧棘轮的中部设有圆柱通孔,锁紧棘轮的圆柱通孔和分度轴固连,锁紧棘轮和锁紧棘爪啮合。本发明利用机械自锁,锁紧更加安全和可靠,并且易于保证加工精度。(The invention provides a numerical control indexing table locked by a ratchet wheel and a pawl, which comprises a worm gear assembly, a ratchet wheel and pawl assembly and an indexing table assembly, wherein the worm gear assembly comprises an indexing worm wheel, an indexing worm, a planetary reducer and a servo motor, a cylindrical hole is formed in the center of the indexing worm wheel, and the central cylindrical hole of the indexing worm wheel is fixedly connected with the middle part of an indexing shaft. Ratchet pawl subassembly, including the locking pawl, the locking ratchet, the lead screw, the retaining ring, the nut, the locking handle, the round pin axle, U type crotch and self-lubricating axle sleeve, self-lubricating axle sleeve is I shape solid of revolution structure, the nut is T font solid of revolution structure, the retaining ring is a disc that has central cylindrical through hole, U type crotch comprises bottom plate and riser, be equipped with the cylinder through-hole on the riser of U type crotch, the middle part of locking ratchet is equipped with the cylinder through-hole, the cylinder through-hole and the graduated shaft of locking ratchet link firmly, locking ratchet and locking pawl meshing. The invention utilizes mechanical self-locking, is safer and more reliable in locking and is easy to ensure the processing precision.)

1. The utility model provides a numerical control indexing table that ratchet pawl locked, its includes turbine worm subassembly, ratchet pawl subassembly and indexing table subassembly, its characterized in that, it possesses:

the worm and gear assembly comprises an indexing worm gear, an indexing worm, a planetary reducer and a servo motor, a cylindrical hole is arranged in the center of the indexing worm wheel, the central cylindrical hole of the indexing worm wheel is fixedly connected with the middle part of the indexing shaft, the indexing worm consists of a worm, a first shaft section, a second shaft section and a third shaft section, the first shaft section and the second shaft section are respectively connected with the box body through the inner diameter of a rolling bearing, the worm is meshed with the indexing worm wheel, the end part of the third shaft section of the indexing worm is fixedly connected with the end part of the output shaft of the planetary reducer, an input shaft of the planetary reducer is fixedly connected with an output shaft of the servo motor, a shell of the planetary reducer is fixedly connected with a wall plate of the box body, and a shell of the servo motor is fixedly connected with the shell of the planetary reducer;

the ratchet pawl assembly comprises a locking pawl, a locking ratchet wheel, a plate spring A, a lead screw, a check ring, a nut, a locking handle, a plate spring B, a pin shaft, a U-shaped fork frame, an L-shaped guide key and a self-lubricating shaft sleeve, wherein the self-lubricating shaft sleeve is of an I-shaped revolving body structure, a cylindrical through hole is formed in the middle of the self-lubricating shaft sleeve, the nut is of a T-shaped revolving body structure, an internal thread cylindrical through hole is formed in the middle of the self-lubricating shaft sleeve, the check ring is a disc with a central cylindrical through hole, the U-shaped fork frame is composed of a bottom plate and a vertical plate, the vertical plate of the U-shaped;

a cylindrical through hole is formed in the middle of the locking ratchet wheel, the cylindrical through hole of the locking ratchet wheel is fixedly connected with the indexing shaft, the locking ratchet wheel is meshed with the locking pawl, a key groove parallel to the axis is formed in one side face of the lead screw, the first end of the L-shaped guide key is in clearance fit with the key groove of the lead screw, and the second end of the L-shaped guide key is fixedly connected with the inner wall of the box body; and

the indexing table assembly comprises a box body, an indexing shaft, an indexing worktable and rolling bearings, wherein each rolling bearing comprises a first rolling bearing, a second rolling bearing, a third rolling bearing and a fourth rolling bearing, a bearing cylindrical through hole and a shaft sleeve cylindrical through hole are formed in adjacent wall plates of the box body, the outer diameter of each rolling bearing is connected with the bearing cylindrical through hole of the box body, the indexing shaft is connected with the two sides of the box body through the inner diameter of each rolling bearing and is suspended from one side of the box body, and the suspended shaft end of the indexing shaft is fixedly connected with the indexing worktable.

2. The numerical control index table locked by ratchet and pawl according to claim 1, wherein in the ratchet and pawl assembly, the upper and lower end surfaces of the self-lubricating sleeve are in clearance fit with the sleeve cylindrical through hole of the box wall plate, the small cylindrical side surface of the nut outer diameter is connected with the cylindrical through hole of the self-lubricating sleeve, one end surface of the retainer ring is fixedly connected with the small cylindrical end surface of the nut outer diameter, the first end surface of the nut outer diameter large cylinder is connected with one end surface of the self-lubricating sleeve, the lead screw is in threaded connection with the nut inner diameter, the lead screw is respectively suspended from the inner side and the outer side of one wall plate of the box body, the outer surface of the U-shaped fork frame bottom plate is fixedly connected with the end part of the lead screw suspended into the box wall plate, and the cylindrical through holes of the locking pawl are connected with the cylindrical through holes of the upright plates on both sides of, the locking handle is fixedly connected with the second end face of the large cylinder with the outer diameter of the nut, and the plate spring A and the plate spring B are respectively and fixedly connected with the two side faces of the nut.

3. The ratchet-and-pawl-locked, digitally controlled indexing table according to claim 1, wherein the worm gear has a diameter greater than a diameter of the first shaft section, the first shaft section has a diameter equal to a diameter of the second shaft section, and the second shaft section has a diameter greater than a diameter of the third shaft section.

4. The numerical control indexing table locked by the ratchet wheel and the pawl as claimed in claim 1, wherein the diameter of the bearing cylindrical through hole on the wall plate of the box body is equal to the outer diameter of the rolling bearing, the diameter of the sleeve cylindrical through hole on the wall plate of the box body is greater than the diameter of the self-lubricating sleeve, the diameter of the cylindrical through hole of the retainer ring is greater than the outer diameter of the lead screw, and the diameters of the cylindrical through holes on the two vertical plates of the U-shaped fork frame are equal.

5. The numerical control indexing table locked by a ratchet wheel and a pawl as claimed in claim 4, wherein the bearing cylindrical through holes on the wall plate of the box body are paired in pairs, the axes of the bearing cylindrical through holes as a pair are on the same straight line, the axes of the two pairs of bearing cylindrical through holes are perpendicular to each other, the central line of the sleeve cylindrical through hole is perpendicular to the central line of the indexing worm wheel and on two different surfaces, and the axes of the lead screw, the retainer ring, the nut, the U-shaped fork and the self-lubricating sleeve are on the same straight line.

6. The numerical control indexing table locked by the ratchet wheel and the pawl as claimed in claim 2 or 4, wherein the pin shaft is in interference fit with the cylindrical through holes on the two vertical plates of the U-shaped fork, the center line of the cylindrical through hole on the locking pawl is perpendicular to the plane of the locking pawl and is in clearance fit with the pin shaft, and the locking pawl is in clearance fit with the cylindrical through holes on the two vertical plates of the U-shaped fork.

7. The numerical control indexing table for ratchet and pawl locking according to claim 1 or 2, wherein the locking pawl is a flat plate member with a sharp point, curved sides and a straight bottom, the two planes of the locking pawl are symmetrical to the central plane of the locking ratchet wheel, and the central plane of the locking ratchet wheel is perpendicular to the axis of the locking ratchet wheel.

8. The numerical control indexing table for ratchet and pawl locking according to claim 6, wherein the linear contour of the bottom of the locking pawl has a clearance of 2mm to 3mm from the inner surface of the bottom plate of the U-shaped fork, so as to ensure that the locking pawl can swing a certain amount left and right under the action of external force and ensure that the locking pawl can be well contacted with the locking ratchet at any position.

9. The numerical control indexing table locked by the ratchet wheel and the pawl as claimed in claim 2, wherein the plate spring A and the plate spring B clamp the locking pawl to ensure that the locking pawl is in a fixed position when no external force is applied, when the locking pawl is applied with the external force, the locking pawl can overcome the elastic force of the plate spring A and the plate spring B to swing to one side, and when the external force is removed, the locking pawl still returns to the fixed position restrained by the plate spring A and the plate spring B.

Technical Field

The invention relates to the field of manufacturing of numerical control machine tool components, in particular to a numerical control indexing table locked by a ratchet wheel and a pawl.

Background

The numerical control indexing table is one of important tools of many machine manufacturers and is one of main components of some machine tools. The numerical control indexing table must be locked after each indexing, and if the locking is not reliable, machining errors and even waste products can be generated.

The prior numerical control indexing table is locked by adopting a manual friction locking mode, and has the defects that: the magnitude of the locking force depends on the arm force of an operator to a great extent, so that the phenomenon of machining error caused by trace transmission under the action of the cutting force is generated after the numerical control indexing table is locked.

Disclosure of Invention

Aiming at the problems of the traditional neutral performance test, the invention provides a numerical control indexing table locked by a ratchet wheel and a pawl, which is mainly used for simplifying the operation process, improving the loading precision, improving the detection precision, reducing the labor intensity of workers and obtaining more practical experimental data.

The invention provides a numerical control indexing table locked by ratchet wheels and pawls, which comprises a worm and gear assembly, a ratchet wheel and pawl assembly and an indexing table assembly. The worm and gear assembly comprises an indexing worm gear, an indexing worm, a planetary reducer and a servo motor, a cylindrical hole is arranged in the center of the indexing worm wheel, the central cylindrical hole of the indexing worm wheel is fixedly connected with the middle part of the indexing shaft, the indexing worm consists of a worm, a first shaft section, a second shaft section and a third shaft section, the first shaft section and the second shaft section are respectively connected with the box body through the inner diameter of a rolling bearing, the worm is meshed with the indexing worm wheel, the end part of the third shaft section of the indexing worm is fixedly connected with the end part of the output shaft of the planetary reducer, the input shaft of the planetary reducer is fixedly connected with the output shaft of the servo motor, the shell of the planetary reducer is fixedly connected with the wall plate of the box body, and the shell of the servo motor is fixedly connected with the shell of the planetary reducer. The ratchet pawl assembly comprises a locking pawl, a locking ratchet wheel, a plate spring A, a lead screw, a check ring, a nut, a locking handle, a plate spring B, a pin shaft, a U-shaped fork frame, an L-shaped guide key and a self-lubricating shaft sleeve, wherein the self-lubricating shaft sleeve is of an I-shaped revolving body structure, a cylindrical through hole is formed in the middle of the self-lubricating shaft sleeve, the nut is of a T-shaped revolving body structure, an internal thread cylindrical through hole is formed in the middle of the self-lubricating shaft sleeve, the check ring is a disc with a central cylindrical through hole, the U-shaped fork frame is composed of a bottom plate and a vertical plate, the vertical plate of the U-shaped. The middle part of the locking ratchet wheel is provided with a cylindrical through hole, the cylindrical through hole of the locking ratchet wheel is fixedly connected with the indexing shaft, the locking ratchet wheel is meshed with the locking pawl, a key groove parallel to the axis is formed in one side face of the lead screw, the first end of the L-shaped guide key is in clearance fit with the key groove of the lead screw, and the second end of the L-shaped guide key is fixedly connected with the inner wall of the box body. The indexing table assembly comprises a box body, an indexing shaft, an indexing worktable and rolling bearings, wherein each rolling bearing comprises a first rolling bearing, a second rolling bearing, a third rolling bearing and a fourth rolling bearing, a bearing cylindrical through hole and a shaft sleeve cylindrical through hole are formed in adjacent wall plates of the box body, the outer diameter of each rolling bearing is connected with the bearing cylindrical through hole of the box body, the indexing shaft is connected with the two sides of the box body through the inner diameter of each rolling bearing and is suspended from one side of the box body, and the suspended shaft end of the indexing shaft is fixedly connected with the indexing worktable.

Preferably, in the ratchet pawl assembly, the upper end surface and the lower end surface of the self-lubricating shaft sleeve are in clearance fit with a shaft sleeve cylindrical through hole of a box body wall plate, a small cylindrical side surface of the outer diameter of the nut is connected with the cylindrical through hole of the self-lubricating shaft sleeve, one end surface of the check ring is fixedly connected with the small cylindrical end surface of the outer diameter of the nut, a first end surface of a large cylindrical outer diameter nut is connected with one end surface of the self-lubricating shaft sleeve, the lead screw is in threaded connection with the inner diameter of the nut, the lead screw is respectively suspended from the inner side and the outer side of one wall plate of the box body, the outer surface of the U-shaped fork frame bottom plate is fixedly connected with the end part of the lead screw suspended into the box body wall plate, the cylindrical through hole of the locking pawl is connected with the cylindrical through holes of the vertical plates on the two sides of the U-, the plate spring A and the plate spring B are respectively and fixedly connected with two side surfaces of the nut.

Preferably, the worm has a diameter greater than a diameter of the first shaft section, the first shaft section has a diameter equal to a diameter of the second shaft section, and the second shaft section has a diameter greater than a diameter of the third shaft section.

Preferably, the diameter of the bearing cylindrical through hole in the wall plate of the box body is equal to the outer diameter of the rolling bearing, the diameter of the shaft sleeve cylindrical through hole in the wall plate of the box body is larger than the diameter of the self-lubricating shaft sleeve and is equal to the diameter of the self-lubricating shaft sleeve, the diameter of the cylindrical through hole of the retainer ring is larger than the outer diameter of the lead screw, and the diameters of the cylindrical through holes in the two vertical plates of the U-shaped fork frame are.

Preferably, the bearing cylindrical through holes on the box wall plate are paired pairwise, the axes of the bearing cylindrical through holes serving as one pair are on the same straight line, the axes of the two pairs of bearing cylindrical through holes are mutually perpendicular, the central line of the shaft sleeve cylindrical through hole is perpendicular to the central line of the indexing worm wheel and on two different surfaces, and the axes of the lead screw, the retainer ring, the nut, the U-shaped fork frame and the self-lubricating shaft sleeve are on the same straight line.

Preferably, the pin shaft and the cylindrical through holes on the two vertical plates of the U-shaped fork frame form an interference fit, the central line of the cylindrical through hole on the locking pawl is perpendicular to the plane of the locking pawl and forms a clearance fit with the pin shaft, and the locking pawl and the cylindrical through holes on the two vertical plates of the U-shaped fork frame form a clearance fit.

Preferably, the locking pawl is a flat plate part with a sharp point, curved sides and a straight bottom, the two planes of the locking pawl are symmetrical to the central plane of the locking ratchet wheel, and the central plane of the locking ratchet wheel is perpendicular to the axis of the locking ratchet wheel.

Preferably, a clearance of 2 mm-3 mm is formed between the linear contour of the bottom of the locking pawl and the inner surface of the bottom plate of the U-shaped fork frame, so that the locking pawl can swing left and right by a certain amount under the action of external force, and the locking pawl can be well contacted with a locking ratchet wheel at any position.

Preferably, the plate spring a and the plate spring B clamp the locking pawl to ensure that the locking pawl is in a fixed position when no external force acts on the locking pawl, when the locking pawl receives the external force, the locking pawl can overcome the elastic force of the plate spring a and the plate spring B to swing to one side, and when the external force is removed, the locking pawl still returns to the fixed position restrained by the plate spring a and the plate spring B.

Compared with the prior art, the invention has the following advantages:

the numerical control indexing table is designed from a mechanical structure, utilizes mechanical self-locking, abandons the transmitted friction force as locking force, ensures that the numerical control indexing table is safer and more reliable in locking, is easy to ensure the precision in processing, ensures that the processed workpiece has higher processing precision, is more practical in fitting, and provides a precision basis for subsequent installation and assembly. The invention utilizes mechanical self-locking, reduces the injury strength of workers, increases the safety and is more humanized. The invention has the characteristics of reasonable structure, wide application, low manufacturing cost, stable performance, simple and convenient installation and loading implementation and the like, and is suitable for numerical control machines of different types and models.

Drawings

FIG. 1 is a front view of the overall structure of the numerical control indexing table of the ratchet-pawl locking of the present invention;

FIG. 2 is a schematic sectional view of the numerical control indexing table locked by the ratchet and pawl in the direction A-A;

FIG. 3 is a schematic cross-sectional view of the numerical control indexing table locked by the ratchet and pawl in the B-B direction;

FIG. 4 is a schematic cross-sectional view of the numerical control indexing table locked by the ratchet and pawl of the present invention in the C-C direction; and

FIG. 5 is a schematic cross-sectional view of the numerical control indexing table locked by the ratchet and pawl of the invention in the D-D direction.

The main reference numbers:

the locking device comprises a box body 1, a first rolling bearing 2, an indexing shaft 3, an indexing worm wheel 4, a locking ratchet wheel 5, a second rolling bearing 6, an indexing worm 7, a third rolling bearing 8, a fourth rolling bearing 9, a locking pawl 10, a plate spring A11, a lead screw 12, a check ring 13, a nut 14, a locking handle 15, a plate spring B16, a pin shaft 17, a U-shaped fork frame 18, an L-shaped guide key 19, a self-lubricating shaft sleeve 20, an indexing worktable 21, a planetary reducer 22 and a servo motor 23.

Detailed Description

The technical contents, structural features, attained objects and effects of the present invention are explained in detail below with reference to the accompanying drawings.

A numerical control indexing table locked by ratchet and pawl is shown in figure 1 and comprises a worm gear assembly, a ratchet and pawl assembly and an indexing table assembly.

The worm and gear assembly, as shown in fig. 2, comprises an indexing worm wheel 4, an indexing worm 7, a planetary reducer 22 and a servo motor 23, wherein a cylindrical hole is formed in the center of the indexing worm wheel 4, the central cylindrical hole of the indexing worm wheel 4 is fixedly connected with the middle of an indexing shaft 3, the indexing worm 4 comprises a worm, a first shaft section, a second shaft section and a third shaft section, the first shaft section and the second shaft section are respectively connected with a box body 1 through the inner diameter of a rolling bearing, and the worm is meshed with the indexing worm wheel 7.

As shown in fig. 2, the end of the third shaft segment of the indexing worm 7 is fixedly connected to the end of the output shaft of the planetary reducer 22, the input shaft of the planetary reducer 22 is fixedly connected to the output shaft of the servo motor 23, the housing of the planetary reducer 22 is fixedly connected to the wall plate of the casing 1, and the housing of the servo motor 23 is fixedly connected to the housing of the planetary reducer 22. The servo motor 23 has a built-in absolute encoder, and the servo motor 23 has two working modes: normal indexing movement and low speed positioning movement.

The ratchet-pawl assembly, as shown in fig. 3, includes a locking pawl 10, a locking ratchet 5, a plate spring a11, a lead screw 12, a retainer ring 13, a nut 14, a locking handle 15, a plate spring B16, a pin 17, a U-shaped fork 18, an L-shaped guide key 19 and a self-lubricating sleeve 20.

As shown in fig. 4, the self-lubricating shaft sleeve 20 is an i-shaped solid of revolution structure, and the middle portion is provided with a cylindrical through hole, the nut 14 is a T-shaped solid of revolution structure, and the middle portion is provided with an internal thread cylindrical through hole, the retainer ring 13 is a disk with a central cylindrical through hole, the U-shaped fork 18 is composed of a bottom plate and a vertical plate, the vertical plate of the U-shaped fork 18 is provided with a cylindrical through hole, and the middle lower portion of the locking pawl 10 is provided with a cylindrical. The middle part of the locking ratchet wheel 5 is provided with a cylindrical through hole, the cylindrical through hole of the locking ratchet wheel 5 is fixedly connected with the indexing shaft 3, the locking ratchet wheel 5 is meshed with the locking pawl 10, one side surface of the screw rod 12 is provided with a key groove parallel to the axis, the first end of the L-shaped guide key 19 is in clearance fit with the key groove of the screw rod 12, and the second end of the L-shaped guide key 19 is fixedly connected with the inner wall of the box body 1.

As shown in fig. 5, the upper and lower end faces of the self-lubricating shaft sleeve 20 are in clearance fit with the shaft sleeve cylindrical through hole of the wall plate of the box 1, the small cylindrical side face of the outer diameter of the nut 14 is connected with the cylindrical through hole of the self-lubricating shaft sleeve 20, one end face of the retainer ring 13 is fixedly connected with the small cylindrical end face of the outer diameter of the nut 14, the first end face of the large cylinder of the outer diameter of the nut 14 is connected with one end face of the self-lubricating shaft sleeve 20, the lead screw 12 is in threaded connection with the inner diameter of the nut 14, the lead screw 12 is respectively suspended from the inner side and the outer side of the wall plate of the box 1, the outer surface of the bottom plate of the U-shaped fork 18 and the end portion of the lead screw 12 suspended into the wall plate of the box 1 are fixedly connected, the cylindrical through hole of the locking pawl 10 is connected with the cylindrical through holes of the wall plates on both sides of the U-.

The index table assembly, as shown in fig. 1, it includes box 1, index shaft 3, index table 4 and antifriction bearing, it includes first antifriction bearing 2, second antifriction bearing 6, third antifriction bearing 8 and fourth antifriction bearing 9, be equipped with bearing cylinder through-hole and axle sleeve cylinder through-hole on the adjacent wallboard of box 1, antifriction bearing's external diameter and box 1's bearing cylinder through-hole are connected, index shaft 3 passes through antifriction bearing's internal diameter and box 1's both sides and is connected, and hang out from one side of box 1, index shaft 3's the axle end of hanging out and index table 4 fixed connection.

The diameter of the worm is larger than that of the first shaft section, the diameter of the first shaft section is equal to that of the second shaft section, and the diameter of the second shaft section is larger than that of the third shaft section.

As shown in fig. 1, the diameter of the bearing cylindrical through hole on the wall plate of the box 1 is equal to the outer diameter of the rolling bearing, the diameter of the shaft sleeve cylindrical through hole on the wall plate of the box 1 is greater than the diameter of the self-lubricating shaft sleeve 20 and is equal to the diameter of the self-lubricating shaft sleeve, the diameter of the cylindrical through hole of the retainer ring 13 is greater than the outer diameter of the screw 12, and the diameters of the cylindrical through holes on the two vertical plates.

The bearing cylindrical through holes on the wall plate of the box body 1 are paired pairwise, the axes of the bearing cylindrical through holes as a pair are on the same straight line, the axes of the two pairs of bearing cylindrical through holes are mutually vertical, the central line of the shaft sleeve cylindrical through hole is vertical to the central line of the indexing worm wheel and on two different surfaces, and as shown in fig. 4, the axes of the screw rod 12, the check ring 13, the nut 14, the U-shaped fork frame 18 and the self-lubricating shaft sleeve 20 are on the same straight line.

The pin shaft 17 and the cylindrical through holes on the two vertical plates of the U-shaped fork frame 18 form interference fit, the central line of the cylindrical through hole on the locking pawl 10 is vertical to the plane of the locking pawl, and forms clearance fit with the pin shaft 17, and the locking pawl 10 and the cylindrical through holes on the two vertical plates of the U-shaped fork frame 18 form clearance fit.

As shown in fig. 5, the locking pawl 10 is a flat plate member with a sharp point, curved sides and a straight bottom, and the two planes of the locking pawl 10 are symmetrical to the central plane of the locking ratchet 5, and the central plane of the locking ratchet 5 is perpendicular to the axis of the locking ratchet 5.

As shown in fig. 4, the linear contour of the bottom of the locking pawl 10 and the inner surface of the bottom plate of the U-shaped yoke 18 have a clearance of 2mm to 3mm to ensure that the locking pawl 10 can swing a certain amount left and right under the action of external force, and ensure that the locking pawl 10 can be in good contact with the locking ratchet 5 at any position.

The plate spring A11 and the plate spring B16 clamp the locking pawl 10 to ensure that the locking pawl 10 is at a fixed position when no external force acts on the locking pawl 10, when the locking pawl 10 is acted by the external force, the locking pawl can overcome the elastic force of the plate spring A11 and the plate spring B16 to swing to one side, and after the external force is removed, the locking pawl 10 still returns to the fixed position restrained by the plate spring A11 and the plate spring B16.

The numerical control indexing table for locking the ratchet wheel and the pawl is further described by combining the embodiment as follows:

the indexing zero-setting process of the numerical control indexing table locked by the ratchet wheel and the pawl comprises the following steps:

first, the locking handle 15 is rotated counterclockwise to rotate the nut 14 counterclockwise, and due to the restriction of the L-shaped guide key 19, the lead screw 12 will move toward the outside of the case 1, thereby driving the U-shaped fork 18, the pin 17, the leaf spring a11, the leaf spring B16, and the locking pawl 10 to move toward the outside of the case 1, and disengaging the locking pawl 10 from the locking ratchet 5.

Then, the servo motor 23 is started in a normal indexing movement mode, the indexing table 21 and the locking ratchet wheel 5 are driven to rotate together through the planetary reducer 22, the indexing worm 7, the indexing worm wheel 4 and the indexing shaft 3 until the indexing table 21 is different from the initial working position by 20, the working mode of the servo motor 23 is changed into a low-speed positioning movement mode, and the indexing worm wheel 4, the indexing shaft 3, the indexing table 21, the locking ratchet wheel 5 and the like rotate at an extremely low rotating speed to reach the initial working position of the indexing table 21.

Then, the locking handle 15 is rotated clockwise to drive the nut 14 to rotate clockwise, and due to the restriction of the L-shaped guiding key 19, the screw 12 will move toward the inner side of the box 1, thereby driving the U-shaped fork 18, the pin shaft 17, the plate spring A11, the plate spring B16 and the locking pawl 10 to move towards the inner side of the box body 1, so that the locking pawl 10 is inserted into the tooth groove of the locking ratchet wheel 5, when the locking handle 15 is continuously rotated, the locking pawl 10 pushes the locking ratchet wheel 5 to rotate, the indexing worm wheel 4 is driven to rotate by the indexing shaft 3, the rotating direction of the indexing worm wheel 4 is the same as that of the indexing process, one side tooth surface of the indexing worm wheel 4 is tightly attached to one side tooth surface of the indexing worm 7, the end surfaces of the first shaft section and the second shaft section on the indexing worm 7 are tightly attached to the end surface of the inner ring of the rolling bearing, the inner ring of the rolling bearing and the rolling body of the rolling bearing, and the indicating value of the built-in absolute encoder of the servo motor 23 is adjusted to be 0 degree.

The indexing position adjusting process of the numerical control indexing table locked by the ratchet wheel and the pawl comprises the following steps:

first, the locking handle 15 is rotated counterclockwise to rotate the nut 14 counterclockwise, and due to the restriction of the L-shaped guide key 19, the lead screw 12 will move toward the outside of the case 1, thereby driving the U-shaped fork 18, the pin 17, the leaf spring a11, the leaf spring B16, and the locking pawl 10 to move toward the outside of the case 1, and disengaging the locking pawl 10 from the locking ratchet 5.

Then, the servo motor 23 is started in a normal indexing movement mode, the indexing table 21 and the locking ratchet wheel 5 are driven to rotate together through the planetary reducer 22, the indexing worm 7, the indexing worm wheel 4 and the indexing shaft 3 until the indexing table 21 is away from the first indexing position difference 20, and then the working mode of the servo motor 23 is changed into a low-speed positioning movement mode, so that the indexing worm wheel 4, the indexing shaft 3, the indexing table 21, the locking ratchet wheel 5 and the like rotate at an extremely low rotating speed to reach the first indexing position of the indexing table 21.

Then, the locking handle 15 is rotated clockwise to drive the nut 14 to rotate clockwise, due to the limitation of the L-shaped guide key 19, the lead screw 12 will move towards the inner side of the box body 1, thereby driving the U-shaped fork 18, the pin shaft 17, the leaf spring a11, the leaf spring B16 and the locking pawl 10 to move towards the inner side of the box body 1, so that the locking pawl 10 is inserted into the tooth space of the locking ratchet 5, when the locking handle 15 is rotated continuously, the locking pawl 10 will push the locking ratchet 5 to rotate, the indexing worm wheel 4 is driven to rotate by the indexing shaft 3, the rotation direction of the indexing worm wheel 4 is the same as the rotation direction of the indexing process, so that the tooth surface on one side of the indexing worm wheel 4 is tightly attached to the tooth surface on one side of the indexing worm 7, and the end surfaces of the first shaft section and the second shaft section on the indexing worm 7 are tightly. The position of the index table 21 is now well defined and no wobbling or wobbling occurs under external forces, such as cutting forces.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.