CN114799935A - Numerical control rotary worktable - Google Patents

Abstract

The invention relates to the field of numerical control machine tools, in particular to a numerical control rotary worktable, which consists of a box body, a worktable surface, a worm wheel, a worm shaft, a movable fluted disc, a fixed fluted disc, a shaft, a piston, an outer spline sleeve and an inner spline ring. The working table is arranged on the shaft and can axially move together with the shaft and the piston, when the working table axially moves upwards, the movable fluted disc and the static fluted disc are disengaged, and the working table and the shaft are driven by the gear, the worm wheel, the worm shaft, the outer spline housing and the inner spline ring to rotate; when the working table moves axially downwards, the movable fluted disc and the static fluted disc are meshed, and the indexing precision of the rotary table is ensured.

Description

Numerical control rotary worktable

Technical Field

The invention relates to the field of numerical control machine tools, in particular to a numerical control rotary worktable.

Background

The invention provides a numerical control rotary table structure, which is used on machine tools such as a machining center, a grinding machine and the like, and can realize a fourth shaft indexing function by matching the numerical control rotary table on the basis of three shafts of a machine tool X, Y, Z.

At present, the transmission technology of the numerical control rotary table mainly has two modes: mechanical numerical control rotary table and torque motor direct drive rotary table.

The patent fourth shaft torque motor high-speed numerical control rotary table (ZL 201510245411.1) provides a fourth shaft torque motor high-speed numerical control rotary table, and it has high accuracy, high rotational speed, response speed is fast, dynamic rigidity is good, the clearance is little, can divide the characteristics in succession, provides the fourth rotation coordinate axis for machining center and realizes the four-axis linkage function, can accomplish the milling process and the turn-milling combined machining of complicated curved surface. In order to measure and feed back the rotation angle of the turntable, the fourth shaft torque motor high-speed numerical control turntable further comprises a rotation angle measuring device angle encoder. Further in order to realize good stop of the rotary table and keep the rotary table at a required angle position, the fourth shaft torque motor high-speed numerical control rotary table also comprises an end surface contact type disc brake structure. The structure is suitable for light and medium loads and high-rotating-speed linkage machining working conditions, and the angle encoder is expensive. In the case of heavy load, only indexing processing, and high indexing accuracy is required, the applicability is not high.

The patent relates to a clearance compensation device (ZL 201410274991.2) of a double-lead worm gear pair, which provides a quick compensation device for the clearance of the double-lead worm gear pair, which can accurately set a compensation amount and efficiently implement compensation, and is used for improving the precision and the precision retentivity of a numerical control turntable. However, for the sliding friction of the worm-gear pair, after the sliding friction is used for a period of time, the meshing clearance of the worm-gear pair is increased due to abrasion, so that the precision of the numerical control turntable is seriously influenced. The patent provides a method for accurately setting the compensation amount and efficiently implementing the compensation, but does not solve the problem of the need for periodic compensation.

The end face fluted disc is a precision connector which connects two parts together, can not only center but also transmit torque and does not separate in working. The end face teeth are mainly applied to the occasions of high-precision intermittent positioning and high rotating speed and large torque transmission. Such as intermittent positioning in the machine tool industry, robot joints, medical instruments and the like, and high-speed and high-torque transmission devices such as rotors and impellers of centrifugal compressors, gas turbine wheel discs, aviation turbine engines, high-power gear boxes, propeller turbine blades of marine propellers, high-speed locomotive bogie spindles and the like. The clutch has the advantages of large meshing area, long service life, high precision, good self-centering performance, capability of transmitting larger torque, capability of dividing a complex overall structure into a plurality of simple structures, and convenience in design, manufacture and installation. The end-face toothed disc is high in hardness and wear-resistant, the hardness of the end-face toothed disc made of chrome molybdenum alloy steel (SCM 415H) subjected to strict heat treatment reaches HRC58 degrees, and the end-face toothed disc has the characteristics of wear resistance and long service life. The end face fluted disc has high positioning precision and repeated positioning precision, and can ensure the positioning precision of +/-2.5 seconds and the repeated positioning precision of +/-1 second. The end face fluted disc is ultra-precise and self-centering, the meshing is accurate, the precise and self-centering can be realized through the meshing of the convex-concave teeth, and the interchangeability is good.

Disclosure of Invention

The invention aims to provide a numerical control rotary table, which structurally comprises: the worm gear box comprises a box body, a working table top, a worm gear, a worm shaft, a movable fluted disc, a fixed fluted disc, a shaft, a piston, an external spline housing and an internal spline ring.

The technical scheme of the invention is shown in the claims.

The invention has the advantages and beneficial effects that:

1. the invention provides a numerical control rotary table, which consists of a box body, a working table top, a worm wheel, a worm shaft, a movable fluted disc, a fixed fluted disc, a shaft, a piston, an external spline sleeve and an internal spline ring, and is used on machine tools such as a machining center, a grinding machine and the like, and the numerical control rotary table is matched on the basis of X, Y, Z three shafts, so that the fourth shaft indexing function can be realized;

2. the invention relates to a numerical control rotary worktable.A pinion is driven to rotate by an output shaft of a servo motor through an expansion sleeve, the pinion and a gearwheel are mutually meshed and drive a worm shaft to rotate through the expansion sleeve arranged on the tail part of the cylindrical end of the worm shaft, a worm on the worm shaft and a worm wheel are meshed and drive a worm wheel to rotate, and the worm wheel drives a driving shaft to rotate through an internal spline ring and an external spline sleeve and drives a worktable to rotate in an indexing way;

3. according to the numerical control rotary worktable, a worktable surface is fixed on the upper end surface of a shaft through screws, a movable fluted disc is fixed on a seam allowance of the worktable surface through screws, and the movable fluted disc is meshed with a fixed fluted disc arranged on a box body to ensure the positioning precision of the rotary worktable;

4. according to the numerical control rotary table, a piston, a shaft and an outer spline sleeve move downwards, the outer spline sleeve is disengaged from an inner spline ring, a movable fluted disc is engaged with a fixed fluted disc, and the shaft and the outer spline sleeve can rotate circumferentially and are used for compensating errors that a worm wheel cannot reversely drive towards a worm during positioning;

5. the invention relates to a numerical control rotary worktable, which is characterized in that an outer spline sleeve and an induction ring arranged on the outer spline sleeve move up and down along with a piston and a shaft, the induction ring, a locking switch and a transposition switch respectively generate induction signals to determine the locking state and the locking and unlocking state of a worktable, and when a thread block arranged on a flange ring is close to a zero position switch in the rotation process of the outer spline sleeve, the thread block and the zero position switch are induced to generate the induction signals to determine the zero position of the worktable. The angular relationships of the other positions relative to the zero position are read by a cursor mounted on the top surface of the box.

Drawings

FIG. 1 is an isometric view of the present invention;

FIG. 2 is a side sectional view of the present invention;

FIG. 3 is a side cross-sectional view of the case of the present invention;

FIG. 4 is a top cross-sectional view of the present invention;

FIG. 5 is a side view of the present invention with the shield removed;

FIG. 6 is a front sectional view of the present invention.

In the figure, 1 is a work table; 1.1, a working table surface seam allowance; 1.2 the outer edge of the working table; 1.3T-shaped grooves; 2, a box body; 2.1, the lower bottom surface of the box body; 2.2 mounting the flange; 2.3, the upper top surface of the box body; 2.4 annular sealing flange; 2.5 a first inner hole surface of the box body; 2.6 end surface of the first inner hole of the box body; 2.7 a second inner hole surface of the box body; 2.8 end surface of a second inner hole of the box body; 2.9 a third inner hole surface of the box body; 2.10 the end surface of a third inner hole of the box body; 2.11 the fourth external round surface of the box body; 2.12 the fourth excircle end surface of the box body; 2.13 the fifth inner hole surface of the box body; 2.14 the end surface of a sixth inner hole of the box body; 2.15 the front of the box body; 2.16 the end surface of a seventh inner hole of the box body; 2.17 side of the box body; 2.18 zero side hole; 2.19 side hole indexing; 2.20 locking the side hole; 2.21 oil holes; 2.22 oil holes; 2.23 oil drain hole of worm gear cavity; 2.24 oil drain hole of gear cavity; a vertical inner hole 2.25; a horizontal inner hole 2.26; 3, a protective cover; 4, a fixed fluted disc; 4.1 the outer circular surface of the fixed fluted disc; 5, screws; 6 a first flange cover; 6.1 the small external circular surface of the first flange cover; 7, a screw; 8 crossed roller bearings; 8.1 inner circular surface of crossed roller bearing; 8.2 inner ring of crossed roller bearing; 8.3 outer ring of crossed roller bearing; 9 a gasket; 10, a screw; 11 a second flange cover; 11.1 the small outer circular surface of the second flange cover; 11.2 the small end surface of the first flange cover; 12, a screw; 13 a third flange cover; 14, a screw; 15 a piston; 15.1 large outer circle of piston; 15.2 the upper surface of the large excircle of the piston; 15.3 the lower surface of the large excircle of the piston; an upper oil cavity 15.4; a lower oil chamber 15.5; the upper end face 15.6 of the piston; the lower end face 15.7 of the piston; an upper needle bearing groove 15.8; a lower needle bearing groove 15.9; 16 upper thrust roller bearings; 17 lower thrust roller bearings; 18 an upper needle bearing; 19 a lower needle bearing; 20 shafts; 20.1 small outer circular surface of shaft; 20.2 the lower end surface of the large excircle of the shaft; the lower end face of the small excircle of the shaft 20.3; 20.4 the upper end surface of the shaft; 21, a screw; 22 an outer spline housing; 22.1 the upper end face of the external spline housing; 22.2 the lower end surface of the external spline housing; 23 matching a grinding pad; 24 screws; 25, a movable fluted disc; 25.1 moving fluted disc outer circular surface; 26 a worm gear; 26.1 inner hole surface of worm wheel; 26.2 the upper end surface of the worm wheel; 26.3 the lower end surface of the worm wheel; 27 an edge ring; 28, screws; 29 inner spline ring; 30, matching a grinding pad; a 31 worm shaft; 31.1 step ends; 31.2 cylindrical end; 31.3 tail of cylindrical end; 31.4 a worm; 32 angular contact bearings; 33 a transition ring; 34 needle roller bearings; 35 expanding and tightening the sleeve; 36 bull gears; 37 servo motor; 37.1 output shaft; 38 a transition plate; 39 expanding and tightening the sleeve; 40 pinion gears; 41 zero position switch; 42 an indexing switch; 43 locking the switch; a 44 joint; 45, a vernier; 46 oil window; 47 plugging; 48 an induction loop; 49 screws; 50 thread blocks; 51 screws.

Detailed Description

As shown in fig. 1-6, the present invention provides a numerical control rotary table, which mainly comprises: the structure of the worm gear box comprises a box body 2, a working table top 1, a worm wheel 26, a worm shaft 31, a movable fluted disc 25, a fixed fluted disc 4, a shaft 20, a piston 15, an external spline sleeve 22 and an internal spline ring 29, and the structure is as follows:

box 2 is square structure, and bottom surface 2.1 has square mounting flange 2.2 under the box, and top surface 2.3 has annular sealing flange 2.4 on the box, and 2 to the top down have axis perpendicular to box bottom surface 2.1's vertical hole 2.25, and 2 to the left side right side of box have the axis to be on a parallel with the box bottom surface 2.1's horizontal hole 2.26, have on the vertical hole 2.25: the first inner hole face 2.5 of box, the first inner hole end face 2.6 of box, the second inner hole face 2.7 of box, the second inner hole end face 2.8 of box, the third inner hole face 2.9 of box, the third inner hole end face 2.10 of box, the fourth outer circle face 2.11 of box, the fourth outer circle end face 2.12 of box, the fifth inner hole face 2.13 of box, the sixth inner hole end face 2.14 of box, the seventh inner hole end face 2.16 of box.

An outer circular surface 4.1 of the fixed fluted disc is matched with a first inner hole surface 2.5 of the box body and is fixed on a first inner hole end surface 2.6 of the box body through a screw 5, a small outer circular surface 6.1 of a first flange cover on the first flange cover 6 is matched with a second inner hole surface 2.7 of the box body and is fixed on the first inner hole end surface 2.6 of the box body through a screw 7, an inner circular surface 8.1 of a crossed roller bearing on the crossed roller bearing 8 is matched with a fourth outer circular surface 2.11 of the box body, a gasket 9 is fixed on a third inner hole end surface 2.10 of the box body through a screw 10, an inner ring 8.2 of the crossed roller bearing is pre-tightened between the fourth outer circular end surface 2.12 of the box body and the gasket 9, a small outer circular surface 11.1 of a second flange cover on the second flange cover 11 is matched with a fifth inner hole surface 2.13 of the box body and is fixed on a sixth inner hole end surface 2.14 of the box body through a screw 12, and a third flange cover 13 is fixed on a seventh inner hole 2.16 of the box body through a screw 14.

The piston 15 is a hollow stepped shaft structure, the piston 15 is arranged in a cavity formed by a third inner hole surface 2.9 of the box body, a large excircle 15.1 of the piston is arranged in a cavity formed by a small end surface 11.2 of the first flange cover, a second inner hole surface 2.7 of the box body and a second inner hole surface 2.8 of the box body, an upper oil cavity 15.4 is formed by the large excircle 15.1 of the piston, the second inner hole surface 2.7 of the box body and the small end surface 11.2 of the first flange cover, a lower oil cavity 15.5 is formed by the large excircle lower surface 15.3 of the piston, the second inner hole surface 2.7 of the box body and the second inner hole end surface 2.8 of the box body, the upper oil cavity 15.4 and the lower oil cavity 15.5 are respectively connected with a hydraulic pipeline, the piston 15 moves upwards when the lower oil cavity 15.5 supplies oil, the piston 15.4 moves downwards when the upper oil cavity supplies oil, an upper thrust roller bearing 16 is arranged on the upper end surface 15.6 of the piston, a lower thrust roller bearing 17 is arranged on the lower end surface of the piston, a bearing groove 15.6 of the piston is provided with a needle roller bearing groove 15.8, a lower roller bearing groove is arranged on the lower end surface of the needle roller bearing 18.7, a lower needle bearing 19 is mounted in the groove.

The shaft 20 is a hollow stepped shaft structure, the small outer circular surface 20.1 of the shaft is supported on the upper needle roller bearing 18 and the lower needle roller bearing 19, the large outer circular lower end surface 20.2 of the shaft is supported on the upper thrust roller bearing 16, the small outer circular lower end surface 20.3 of the shaft is fixed with an outer spline sleeve 22 through a screw 21, a wear-matching pad 23 is arranged between the upper end surface 22.1 of the outer spline sleeve and the lower thrust roller bearing 17, the shaft 20 can move up and down together with the piston 15, and the shaft 20 can rotate relative to the piston 15.

The working table 1 is of a lower groove structure, the working table 1 is fixed on the upper end face 20.4 of the shaft through a screw 24, a movable fluted disc 25 is fixed on a spigot 1.1 of the working table through a screw 51, the movable fluted disc 25 is meshed with a fixed fluted disc 4 installed on the box body 2, the outer circular face 25.1 of the movable fluted disc is inserted into an annular sealing flange 2.4 of the box body between outer edges 1.2 of the working table, the working table 1 can move axially together with the shaft 20 and the piston 15, the working table 1 can rotate relative to the piston 15 and the box body 2 together with the shaft 20, when the working table 1 moves axially upwards, the movable fluted disc 25 is disengaged from the fixed fluted disc 4, when the working table 1 moves axially downwards, the movable fluted disc 25 is engaged with the fixed fluted disc 4, and a T-shaped groove 1.3 in the radial direction is formed in the working table 1.

The inner hole surface 26.1 of the worm wheel is matched with the outer ring 8.3 of the crossed roller bearing, the edge blocking ring 27 is fixed on the upper end surface 26.2 of the worm wheel through a screw 28, the inner spline ring 29 is fixed on the lower end surface 26.3 of the worm wheel through the screw 28, a wear pad 30 is arranged between the inner spline ring 29 and the outer ring 8.3 of the crossed roller bearing, the inner spline ring 29 is meshed with the outer spline sleeve 22, the outer spline sleeve 22 is meshed with the inner spline ring 29 and the outer spline sleeve 22 when moving upwards and axially together with the shaft 20 and the piston 15, and the inner spline ring 29 is disengaged from the outer spline sleeve 22 when moving downwards and axially together with the shaft 20 and the piston 15.

The worm shaft 31 is arranged in a horizontal inner hole 2.26 with the axis parallel to the lower bottom surface 2.1 of the box body, a step end 31.1 is supported on the box body 2 through an angular contact bearing 32 and a transition ring 33, a cylindrical end 31.2 is supported on the box body 2 through a needle bearing 34, the axis of the worm shaft 31 is parallel to the lower bottom surface 2.1 of the box body and is axially vertical to a worm wheel 26, the worm 31.4 is in meshing transmission with the worm wheel 26, the tail part 31.3 of the cylindrical end is provided with a large gear 36 through an expansion sleeve 35, a servo motor 37 is arranged on the side edge 2.17 of the box body through a transition 38 plate, a protective cover 3 is arranged on the side edge 2.17 of the box body, the servo motor 37 is wrapped in a closed cavity through the protective cover 3 and the side edge 2.17 of the box body, an output shaft 37.1 of the servo motor 37 is provided with a small gear 40 through an expansion sleeve 39, and the small gear 40 is meshed with the large gear 36.

A zero position side hole 2.18, an indexing side hole 2.19, a locking side hole 2.20 and two oil holes 2.21 are formed in a box body side edge 2.17 of the box body 2, a zero position switch 41 is installed on the zero position side hole 2.18, an indexing switch 42 is installed on the indexing side hole 2.19, a locking switch 43 is installed on the locking side hole 2.20, the two oil holes 2.21 are respectively connected with an upper oil cavity 15.4 and a lower oil cavity 15.5, a connector 44 is installed on the box body side edge 2.17, a vernier 45 is installed on an upper top surface 2.3 of the box body, an oil window 46 is arranged on a box body front surface 2.15 of the box body 2, an oil filling hole 2.22, a worm gear cavity oil discharging hole 2.23 and a gear cavity oil discharging hole 2.24 are formed in the box body front surface 2.15 and are blocked by a blocking 47.

An induction ring 48 is fixed on the lower end face 22.2 of the outer spline housing through a screw 49, and the induction ring 48 moves up and down along with the piston 15 and the shaft 20 to generate induction signals with the indexing switch 42 and the locking switch 43.

The edge ring 27 is provided with a thread block 50, and the thread block 50 rotates together with the edge ring 27 and the worm wheel 26 to generate a sensing signal with the zero position switch 41.

When the upper oil cavity 15.4 is filled with oil, the piston 15 and the shaft 20 move downwards to drive the working table 1 and the induction ring 48 arranged on the outer spline housing 22 to move downwards along with the piston 15 and the shaft 20, the movable fluted disc 25 is meshed with the fixed fluted disc 4, and meanwhile, the outer spline housing 22 and the induction ring 48 arranged on the outer spline housing 22 move downwards, and the induction ring 48 and the locking switch 43 generate induction signals to lock the working table 1.

When the lower oil cavity 15.5 is filled with oil, the piston 15 and the shaft 20 move upwards to drive the working table 1 and the working table 1 mounted on the working table to move upwards on the movable fluted disc 25, the movable fluted disc 25 is disengaged from the fixed fluted disc 4, meanwhile, the external spline sleeve 22 and the induction ring 48 mounted on the external spline sleeve 22 move upwards along with the piston 15 and the shaft 20, the induction ring 48 and the indexing switch 42 generate induction signals, and the working table 1 is unlocked and locked. When the working table top 1 is in a releasing and locking state, an output shaft 37.1 of a servo motor 37 drives a small gear 40 to rotate through an expansion sleeve 39, the small gear 40 and a large gear 36 are meshed with each other, a worm shaft 31 is driven to rotate through an expansion sleeve 35 arranged on a tail portion 31.3 of a cylindrical end of the worm shaft 31, a worm 31.4 and a worm wheel 26 on the worm shaft 31 are meshed with each other to drive a worm wheel 26 to rotate, and the worm wheel 26 drives a driving shaft 20 to rotate through an internal spline ring 29 and an external spline sleeve 22 and drives the working table top 1 to rotate in an indexing manner. When the thread block 50 mounted on the edge-blocking ring 27 approaches the zero position switch 41 during the rotation of the external spline housing 22, the thread block 50 senses the zero position switch 41 and generates a sensing signal to determine the zero position of the working platform 1. The angular relationship of the other positions with respect to the zero position is read by means of a cursor 45 mounted on the upper top surface 2.3 of the tank.

When the upper oil cavity 15.4 is filled with oil, the piston 15, the shaft 20 and the outer spline housing 22 move downwards, the outer spline housing 22 is disengaged from the inner spline ring 29, the movable fluted disc 25 is engaged with the fixed fluted disc 4, and the shaft 20 and the outer spline housing 22 can rotate in the circumferential direction to compensate for the error that the worm gear cannot reversely drive towards the worm when positioned. When the lower oil cavity 15.5 is communicated with oil, the piston 15, the shaft 20 and the outer spline housing 22 move upwards, the outer spline housing 22 is meshed with the inner spline ring 29, the movable fluted disc 25 and the fixed fluted disc 4 are disengaged and positioned, and the outer spline housing 22 and the inner spline ring 29 are meshed for transmission.

Lubricating oil pours into through the oil filler point 2.22 on the box, and the oiling volume reads through being provided with oil window 46 on box 2, and the used lubricating oil of worm wheel intracavity passes through worm wheel chamber oil drain hole 2.23 and discharges, and the used lubricating oil of gear intracavity passes through gear chamber oil drain hole 2.24 and discharges, and the workstation is normal during operation, and oil filler point 2.22, worm wheel chamber oil drain hole 2.23, gear chamber oil drain hole 2.24 are given with stifled 47 and are blocked up.

Claims (4)

1. A numerically controlled rotary table, comprising: the box, table surface, worm wheel, worm axle, movable fluted disc, fixed fluted disc, axle, piston, outer spline housing, interior spline ring, the concrete structure is as follows:

the box is square structure, and there is square mounting flange bottom surface under the box, and the top surface has annular sealing flange on the box, and the box has the vertical hole of bottom surface under the axis perpendicular to box extremely to the top down, and the box has the horizontal hole that the axis is on a parallel with bottom surface under the box to the left side right side, has on the vertical hole: a first inner hole surface of the box body, a first inner hole end surface of the box body, a second inner hole end surface of the box body, a third inner hole end surface of the box body, a fourth outer circle end surface of the box body, a fifth inner hole surface of the box body, a sixth inner hole end surface of the box body and a seventh inner hole end surface of the box body;

the outer circular surface of the fixed tooth disc is matched with a first inner hole surface of the box body and is fixed on the end surface of the first inner hole of the box body through a screw, the small outer circular surface of the first flange cover on the first flange cover is matched with a second inner hole surface of the box body and is fixed on the end surface of the first inner hole of the box body through a screw, the inner circular surface of the crossed roller bearing on the crossed roller bearing is matched with the fourth outer circular surface of the box body, the gasket is fixed on the end surface of the third inner hole of the box body through a screw, the inner ring of the crossed roller bearing is pre-tightened between the fourth outer circular surface of the box body and the gasket, the small outer circular surface of the second flange cover on the second flange cover is matched with the fifth inner hole surface of the box body and is fixed on the end surface of the sixth inner hole of the box body through a screw, and the third flange cover is fixed on the end surface of the seventh inner hole of the box body through a screw;

the piston is of a hollow stepped shaft structure, a large excircle of the piston is arranged in a cavity formed by a small end face of a first flange cover, a second inner hole face of a box body and a second inner hole end face of the box body, an upper oil cavity is formed by the large excircle of the piston, the second inner hole face of the box body and the small end face of the first flange cover, a lower oil cavity is formed by the large excircle of the piston, the second inner hole face of the box body and the second inner hole end face of the box body, the upper oil cavity and the lower oil cavity are respectively connected with a hydraulic pipeline, the piston moves upwards when the lower oil cavity supplies oil, the piston moves downwards when the upper oil cavity supplies oil, an upper thrust roller bearing is arranged on the upper end face of the piston, a lower thrust roller bearing is arranged on the lower end face of the piston, a needle roller bearing groove is formed on the upper end face of the piston, an upper needle roller bearing is arranged in the groove, a lower needle roller bearing is arranged on the lower end face of the piston, and a lower needle roller bearing is arranged in the groove;

the shaft is of a hollow stepped shaft structure, the small outer circular surface of the shaft is supported on the upper needle roller bearing and the lower needle roller bearing, the lower end surface of the large outer circle of the shaft is supported on the upper thrust roller bearing, the outer spline sleeve is fixed on the lower end surface of the small outer circle of the shaft through a screw, a grinding pad is arranged between the upper end surface of the outer spline sleeve and the lower thrust roller bearing, the shaft and the piston can move up and down together, and the shaft can rotate relative to the piston;

the working table is of a lower groove structure, the working table is fixed on the upper end surface of the shaft through screws, a movable fluted disc is fixed on a spigot of the working table through screws, the movable fluted disc is meshed with a fixed fluted disc arranged on the box body, the outer circular surface of the movable fluted disc is inserted into an annular sealing flange of the box body between the outer edges of the working table, the working table can move axially together with the shaft and the piston, the working table can rotate together with the shaft relative to the piston and the box body, the movable fluted disc and the static fluted disc are disengaged when the working table moves upwards and axially, the movable fluted disc and the static fluted disc are meshed when the working table moves downwards and axially, and a T-shaped groove in the radial direction is formed in the working table;

the inner hole surface of the worm wheel is matched with the outer ring of the crossed roller bearing, the flange ring is fixed on the upper end surface of the worm wheel through a screw, the inner spline ring is fixed on the lower end surface of the worm wheel through a screw, a matched grinding pad is arranged between the inner spline ring and the outer ring of the crossed roller bearing, the inner spline ring is meshed with the outer spline sleeve when the outer spline sleeve moves upwards and axially together with the shaft and the piston, and the inner spline ring is disengaged from the outer spline sleeve when the outer spline sleeve moves downwards and axially together with the shaft and the piston;

the worm shaft is arranged in a horizontal inner hole with the axis parallel to the lower bottom surface of the box body, the step end is supported on the box body through an angular contact bearing and a transition ring, the cylindrical end is supported on the box body through a needle bearing, the axis of the worm shaft is parallel to the lower bottom surface of the box body and is axially vertical to the worm wheel, the worm and the worm wheel are in meshing transmission, the tail part of the cylindrical end is provided with a large gear through an expansion sleeve, the servo motor is arranged on the side edge of the box body through a transition plate, the side edge of the box body is provided with a protective cover, the protective cover and the side edge of the box body wrap the servo motor in a closed cavity, the output shaft of the servo motor is provided with a small gear through the expansion sleeve, and the small gear and the large gear are mutually meshed.

2. A numerically controlled rotary table according to claim 1, wherein the side of the casing is provided with a zero-position side hole, a shift side hole, a lock side hole and two oil holes, a zero-position switch is mounted on the zero-position side hole, a shift switch is mounted on the shift side hole, a lock switch is mounted on the lock side hole, the two oil holes are connected to the upper oil chamber and the lower oil chamber respectively, and a joint is mounted on the side of the casing, the top surface of the casing is provided with a cursor, the front surface of the casing is provided with an oil window, and the front surface of the casing is provided with an oil filling hole, a worm gear chamber oil discharging hole, and a gear chamber oil discharging hole, and is blocked by a plug.

3. A numerically controlled rotary table according to claim 1, wherein the lower end face of the outer spline housing is fixed with an induction ring by screws, the induction ring moving up and down with the piston and shaft to generate induction signals with the indexing switch and the locking switch.

4. A numerically controlled rotary table according to claim 1, wherein the edge ring has a threaded block mounted thereon, the threaded block rotating with the edge ring and the worm gear to generate the sense signal with the null switch.

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