Rotary table and machine tool

Abstract

The utility model provides a rotary table and a machine tool, the rotary table comprises a fixed seat assembly, a rotary table bearing and a rotary table assembly, the rotary table assembly is rotatably connected with the fixed seat assembly through the rotary table bearing, the rotary table assembly further comprises a rotation amount sensor, the fixed seat assembly comprises a shell and an oil distribution shaft sleeve arranged in the shell, and the oil distribution shaft sleeve is arranged in the shell. The oil distribution shaft sleeve extends from the bottom of the shell to the top of the shell. The rotating table assembly comprises a working table and a connecting base arranged below the working table, the connecting base comprises a rotating table connected with the working table and a rotating shaft which is connected with the rotating table and extends from the top to the bottom, the working table is located above the shell, and the rotating shaft is inserted into the oil distribution shaft sleeve; wherein a containing space is formed in the bottom of the oil distribution shaft sleeve, and the rotation amount sensor is arranged in the containing space and used for sensing the rotation amount of the rotary table assembly relative to the fixed seat assembly. According to the rotary table provided by the utility model, the position of the rotation amount sensor can be conveniently adjusted.

Description

TECHNICAL FIELD

[0001] The utility model relates to processing equipment technical field especially, relates to a rotary table and machine tool. BACKGROUND

[0002] Rotary table is generally applied to four -axis machining center or five -axis machining center, compared with three -axis linear processing, increased c -axis rotation axis, thereby can realize multi -process processing through once clamping.

[0003] Rotary table is generally provided with rotation amount sensor, is used for measuring the number of turns of rotary table, and the existing sensor is generally arranged at the middle position of rotary table along the rotation axis, when needing to adjust the position of sensor or maintenance and replacement sensor, all need to completely dismount rotary table, it is inconvenient to be troublesome and laborious.

[0004] Therefore, how conveniently adjust the position of rotation amount sensor or maintenance and replacement sensor is the problem that needs to be solved urgently. INVENTION CONTENTS

[0005] The utility model provides a rotary table and machine tool, can conveniently adjust the position of rotation amount sensor.

[0006] The utility model provides a rotary table, including fixed seat subassembly, rotary table bearing, rotary table subassembly, rotary table subassembly is connected with fixed seat subassembly rotation through rotary table bearing, still include rotation amount sensor, fixed seat subassembly includes the casing, the oil distribution axle sleeve that sets up in the casing, the oil distribution axle sleeve from the bottom of casing extends towards top, rotary table subassembly includes workbench, the connecting seat that sets up below workbench, the connecting seat includes the rotary table with workbench connection, and the rotary axle that is connected with rotary table and extends from top to bottom, workbench is located above the casing, the rotary axle is inserted in the oil distribution axle sleeve,

[0007] Among them, the bottom of oil distribution axle sleeve is equipped with containing space, rotation amount sensor sets up in containing space, is used for sensing the rotation amount of rotary table subassembly relative fixed seat subassembly.

[0008] In some feasible implementation schemes, the rotation amount sensor includes the reading disc and grating ruler disc that are stacked up and down, the reading disc and grating ruler disc inductive cooperation, the reading disc is installed at the bottom of rotary axle, and the grating ruler disc is installed at the bottom of oil distribution axle sleeve.

[0009] The oil distribution axle sleeve has a through hole that penetrates the oil distribution axle sleeve vertically, and the bottom of the through hole forms the containing space.

[0010] In some possible implementation, the projection area of the reading disc along the rotation axis is greater than the projection area of the rotating shaft along the rotation axis, the reading disc comprises a mounting portion located at the inner ring and a reading portion located at the outer ring, the mounting portion is vertically stacked below the rotating shaft, and the reading portion is vertically located in the through hole of the oil distribution shaft sleeve.

[0011] In some possible implementation, the reading disc is annular, the bottom of the rotating shaft is provided with a positioning protrusion, and the annular reading disc is positioned and matched with the positioning protrusion of the rotating shaft.

[0012] The bottom of the oil distribution shaft sleeve is provided with a positioning groove in communication with the through hole of the oil distribution shaft sleeve, and the grating disc is positioned and matched with the positioning groove of the oil distribution shaft sleeve.

[0013] In some possible implementation, an adjusting ring is further included, the grating disc is vertically mounted on the groove top wall of the positioning groove through the adjusting ring, and the vertical spacing between the grating disc and the reading disc is changed by replacing adjusting rings with different thicknesses or changing the number of adjusting rings.

[0014] The grating disc is annular, the inner ring of the grating disc close to the rotation axis is provided with a clearance, the mounting portion is located in the clearance of the grating disc along the rotation axis direction, the grating disc comprises a grating inner ring located at the outer periphery of the clearance and a fixed outer ring, the fixed outer ring is mounted on the hole wall at the bottom of the through hole of the oil distribution shaft sleeve, the grating inner ring is vertically located in the through hole of the oil distribution shaft sleeve, and the reading portion is vertically directed to the grating inner ring.

[0015] In some possible implementation, a motor support seat is further included, the motor support seat is arranged between the housing and the oil distribution shaft sleeve along a radial direction, wherein the radial direction is perpendicular to the rotation axis of the rotating table assembly, and the motor support seat is further provided with a wire passing hole.

[0016] A direct drive motor and a connecting line connected with the direct drive motor are further included, the direct drive motor is arranged on the motor support seat, and the connecting line passes through the wire passing hole.

[0017] The utility model further provides a machine tool, including base and above-mentioned rotating table, the rotating table is installed in base.

[0018] In some possible implementation, a compensation system is further included, the compensation system comprises:

[0019] An acquisition module is connected with the rotation amount sensor and is used for acquiring the real-time rotating speed of the workbench.

[0020] A compensation module is connected with the acquisition module and is used for controlling the action of the rotating table according to the real-time rotating speed of the workbench.

[0021] In some possible implementation, the acquisition module is further configured to acquire the weight of the workpiece on the workbench; and the compensation module is configured to control the action of the rotary table according to the real-time rotating speed of the workbench and the weight of the workpiece on the workbench.

[0022] In some possible implementation, the compensation system comprises a compensation amount module, which stores the rotary compensation amount of the rotary table when the workbench is in different rotating speed intervals and the workpiece on the workbench is in different weight intervals; the compensation module is further connected with the compensation amount module, configured to acquire the rotary compensation amount from the compensation amount module, and configured to control the action of the rotary table according to the rotary compensation amount.

[0023] The rotary table, by setting the fixed seat assembly, the rotary table bearing, the rotary table assembly, the rotary table assembly is rotatably connected with the fixed seat assembly through the rotary table bearing, and further comprises a rotation amount sensor, the fixed seat assembly comprises a shell, an oil distribution shaft sleeve arranged in the shell, the oil distribution shaft sleeve extends from the bottom of the shell to the top; the rotary table assembly comprises a workbench and a connecting seat arranged below the workbench, the connecting seat comprises a rotary table connected with the workbench and a rotary shaft connected with the rotary table and extending from the top to the bottom, the workbench is located above the shell, and the rotary shaft is inserted into the oil distribution shaft sleeve; wherein, the bottom of the oil distribution shaft sleeve is provided with an accommodation space, and the rotation amount sensor is arranged in the accommodation space and used for sensing the rotation amount of the rotary table assembly relative to the fixed seat assembly, so that the operator can install, disassemble, maintain and repair the rotation amount sensor through the accommodation space without completely disassembling the rotary table, and the position of the rotation amount sensor is adjusted conveniently. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from the structures shown in the drawings without creative labor.

[0025] Figure 1 The schematic diagram of the rotary table provided by an embodiment of the present application.

[0026] Figure 2 The sectional view of Figure 1

[0027] Figure 3 The partial schematic view of Figure 2

[0028] Figure 4 The partial schematic view of Figure 1 ​​The exploded structural schematic view of the fixed seat assembly, the rotating table assembly and the rotation amount sensor.

[0029] Element symbol explanation

[0030] 100, fixed seat assembly; 110, shell; 120, oil distribution shaft sleeve; 121, through hole; 122, positioning groove; 123, adjusting ring; 130, motor support seat; 200, rotating table bearing; 300, rotating table assembly; 310, workbench; 320, connecting seat; 321, rotating table; 322, rotating shaft; 3221, positioning protrusion; 400, rotation amount sensor; 410, reading disc; 411, mounting part; 412, reading part; 420, grating scale disc; 421, avoiding opening; 422, fixed outer ring; 423, grating inner ring; L, rotation axis; X, containing space; 500, direct drive motor; 600, compensation system; 610, acquisition module; 620, compensation module.

[0031] The realization, functional features and advantages of the utility model will be further explained in combination with embodiments and with reference to the drawings. DETAILED DESCRIPTION

[0032] In the description of the utility model, it is understood that the directions or position relations indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are the directions or position relations shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and thus cannot be understood as indicating or implying that the devices or elements indicated must have a specific direction, be constructed and operated in a specific direction, and thus cannot be understood as limiting the utility model.

[0033] In addition, the terms "first" and "second" are only for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise explicitly and specifically limited.

[0034] In the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, or can be detachable connection, or can be integrated; can be mechanical connection; can be directly connected, or can be indirectly connected through an intermediate medium. For ordinary skilled persons in the art, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0035] For making the content of the utility model have more clear and more accurate understanding, now will combine the drawing detailedly. The drawing of the specification shows the example of the embodiment of the utility model, wherein, same mark shows same element. It can be understood that the proportion shown in the drawing of the specification is not the proportion of actual implementation of the utility model, it is only for the purpose of illustration, is not according to the original size drawing.

[0036] Please see Figure 1 And 2 The utility model provides a rotary table, including fixed seat subassembly 100, rotary table bearing 200, rotating platform subassembly 300.

[0037] Please see Figure 2 In order to make the rotary table have the passageway that can transport oil or gas, the fixed seat subassembly 100 includes the shell 110, the oil distribution shaft sleeve 120 arranged in the shell 110, and the oil distribution shaft sleeve 120 is used to transport oil or gas for rotating platform subassembly 300, the oil distribution shaft sleeve 120 extends from the bottom to the top of the shell 110, so as to facilitate cooperation with rotating platform subassembly 300 to realize oil supply or gas supply, wherein the bottom of the oil distribution shaft sleeve 120 is provided with a containing space X, in the embodiment, the oil distribution shaft sleeve 120 has a through hole 121 along the vertical direction through the oil distribution shaft sleeve 120, and the bottom of the through hole 121 forms the containing space X, and it can be understood that the containing space X is connected with the outside, so as to facilitate the operator to operate through the containing space X when the fixed seat subassembly 100 and rotating platform subassembly 300 are assembled.

[0038] Please see Figure 2 In order to facilitate rotation connection with the fixed seat subassembly 100, the rotating platform subassembly 300 includes the workbench 310, the connecting seat 320 arranged below the workbench 310, the workbench 310 is used to carry workpiece, the workbench 310 is located above the shell 110, the rotating platform subassembly 300 is rotationally connected with the fixed seat subassembly 100 through rotary table bearing 200, specifically, the workbench 310 is connected with rotary table bearing 200 through the connecting seat 320.

[0039] Please see Figure 2 In order to facilitate cooperation with the oil distribution shaft sleeve 120, realize oil supply or gas supply for the workbench 310, the connecting seat 320 includes the rotating platform 321 connected with the workbench 310, the rotating shaft 322 connected with the rotating platform 321 and extending from the top to the bottom, and the rotating shaft 322 is inserted into the oil distribution shaft sleeve 120.

[0040] Please see Figure 2 And 3The rotary table further comprises a rotary amount sensor 400 arranged in the accommodating space X for sensing the rotary amount of the rotary table assembly 300 relative to the fixed base assembly 100, and the operator can install, dismount, maintain and repair the rotary amount sensor 400 through the accommodating space X.

[0041] Please refer to Figure 2 and 3 , the following will introduce the sub-structure of the rotary amount sensor 400, which comprises a reading disc 410 and a grating scale disc 420 arranged in a vertical direction, the reading disc 410 is inductive cooperation with the grating scale disc 420, the reading disc 410 is installed on the bottom of the rotating shaft 322, and the grating scale disc 420 is installed on the bottom of the oil distribution shaft sleeve 120; the diameter of the reading disc 410 is smaller than that of the grating scale disc 420, and the reading disc 410 is located above the grating scale disc 420.

[0042] Please refer to Figure 3 , the following will introduce the specific structure of the reading disc 410 and the rotating shaft 322, the diameter of the disc surface of the reading disc 410 is greater than that of the rotating shaft 322, the projection area of the reading disc 410 along the rotation axis L is greater than that of the rotating shaft 322 along the rotation axis L, the reading disc 410 comprises a mounting portion 411 located at the inner ring and a reading portion 412 located at the outer ring, and the mounting portion 411 is arranged below the rotating shaft 322 along the vertical direction through fasteners. It can be understood that the reading portion 412 of the reading disc 410 is fixed to the bottom of the rotating shaft 322 through the mounting portion 411, for example, the mounting portion 411 is provided with a threaded hole or a mounting through hole.

[0043] Please refer to Figure 3 , the following will introduce the structure of the grating scale disc 420, the grating scale disc 420 is annular, and the inner ring of the grating scale disc 420 close to the rotation axis L is provided with a avoiding port 421, the grating scale disc 420 comprises a grating inner ring 423 located at the outer periphery of the avoiding port 421 and a fixed outer ring 422, the grating inner ring 423 is installed on the oil distribution shaft sleeve 120 through the fixed outer ring 422, and the fixed outer ring 422 is provided with a threaded hole or a mounting through hole. The fixed outer ring 422 is installed on the hole wall at the bottom of the through hole 121 of the oil distribution shaft sleeve 120 through fasteners, the mounting portion 411 is located in the avoiding port 421 of the grating scale disc 420 along the rotation axis L, the grating inner ring 423 is located in the through hole 121 of the oil distribution shaft sleeve 120 along the vertical direction, the reading portion 412 is located in the through hole 121 of the oil distribution shaft sleeve 120 along the vertical direction, and the reading portion 412 is vertically directed to the grating inner ring 423. It can be understood that the reading portion 412 is inductive cooperation with the grating inner ring 423.

[0044] Please refer to Figure 4, in order to facilitate the assembly of the reading disc 410 to the rotating shaft 322, the reading disc 410 is annular, the bottom of the rotating shaft 322 is provided with a positioning protrusion 3221, the annular reading disc 410 is positioned and matched with the positioning protrusion 3221 of the rotating shaft 322, and it can be understood that the reading disc 410 is sleeved to the outer periphery of the positioning protrusion 3221; in order to facilitate the installation of the grating ruler disc 420 to the oil distribution shaft sleeve 120, the bottom of the oil distribution shaft sleeve 120 is provided with a positioning groove 122 which is communicated with the through hole 121 of the oil distribution shaft sleeve 120, the grating ruler disc 420 is positioned and matched with the positioning groove 122 of the oil distribution shaft sleeve 120, so that the coarse positioning of the grating ruler disc 420 and the oil distribution shaft sleeve 120 can be realized, and the installation of the oil distribution shaft sleeve 120 is facilitated.

[0045] Please refer to Figure 3 , in order to facilitate the adjustment of the installation position of the reading disc 410 along the vertical direction relative to the grating ruler disc 420, the rotary table further comprises an adjusting ring 123, the grating ruler disc 420 is installed on the groove top wall of the positioning groove 122 through the adjusting ring 123 along the vertical direction, the vertical distance between the grating ruler disc 420 and the reading disc 410 is changed by replacing the adjusting ring 123 with different thickness or changing the number of the adjusting ring 123, and when the length of the rotating shaft 322 is relatively long, the position of the grating ruler disc 420 can be moved downward by the adjusting ring 123 to adapt to the case that the rotating shaft 322 is relatively long.

[0046] Please refer to Figure 2 and 4 , in order to facilitate the driving of the rotary table assembly 300 relative to the fixed seat assembly 100, so that the volume of the rotary table is more compact, the rotary table further comprises a motor support seat 130, the motor support seat 130 is arranged between the housing 110 and the oil distribution shaft sleeve 120 along the radial direction, wherein the radial direction is perpendicular to the rotation axis L of the rotary table assembly 300, and the motor support seat 130 is further provided with a wire hole; the rotary table further comprises a direct drive motor 500 and a connecting line connected with the direct drive motor 500, the direct drive motor 500 is arranged on the motor support seat 130, and the connecting line passes through the wire hole.

[0047] The rotating table is provided with a fixed seat assembly 100, a rotating table bearing 200, a rotating table assembly 300, the rotating table assembly 300 being rotatably connected with the fixed seat assembly 100 through the rotating table bearing 200, and further comprising a rotation amount sensor 400, the fixed seat assembly 100 comprising a shell 110 and an oil distribution shaft sleeve 120 arranged in the shell 110 and extending from the bottom to the top of the shell 110, the rotating table assembly 300 comprising a workbench 310 and a connecting seat 320 arranged below the workbench 310, the connecting seat 320 comprising a rotating table 321 connected with the workbench 310 and a rotating shaft 322 connected with the rotating table 321 and extending from the top to the bottom, the workbench 310 being arranged above the shell 110, and the rotating shaft 322 being arranged in the oil distribution shaft sleeve 120, wherein the bottom of the oil distribution shaft sleeve 120 is provided with a containing space X, the rotation amount sensor 400 is arranged in the containing space X and used for sensing the rotation amount of the rotating table assembly 300 relative to the fixed seat assembly 100, so that the operator can install, disassemble, maintain and repair the rotation amount sensor 400 through the containing space X without completely disassembling the rotating table, and the position of the rotation amount sensor 400 is conveniently adjusted.

[0048] The utility model further provides a machine tool which comprises a base and the rotating table, and the rotating table is installed on the base.

[0049] Please refer to Figure 3 The machine tool further comprises a compensation system 600, and since the rotating shaft 322 of the connecting seat 320 extends from the top to the bottom, when the torque of the rotating shaft 322 is relatively high, the rotating speed of the workbench 310 at the top of the rotating shaft 322 is out of synchronization with the rotating speed of the bottom of the rotating shaft 322, and there is an instantaneous delay, and the compensation system 600 is used for eliminating the delay. Specifically, the compensation system 600 comprises an acquisition module 610 and a compensation module 620.

[0050] Please refer to Figure 3 The acquisition module 610 is connected with the rotation amount sensor 400 and is used for acquiring the real-time rotating speed of the workbench 310. Specifically, the acquisition module 610 is used for acquiring the real-time rotating speed of the bottom of the rotating shaft 322 connected with the workbench 310.

[0051] Please refer to Figure 3The compensation module 620 is connected with the acquisition module 610, and is configured to control the action of the rotary table according to the real-time rotating speed of the workbench 310. It can be understood that when the torque of the rotating shaft 322 is relatively high, since the rotating shaft 322 has a certain length along the axial direction, there will be an error between the measured real-time rotating speed of the rotating shaft 322 and the actual rotating speed, and the compensation module 620 will compensate the rotating shaft 322. When the torque of the rotating shaft 322 is relatively low, there is almost no error between the measured real-time rotating speed of the rotating shaft 322 and the actual rotating speed, and the compensation module 620 will not compensate the rotating shaft 322.

[0052] The torque of the rotating shaft 322 can be evaluated in two dimensions, one of which is the weight of the workpiece. Specifically, the acquisition module 610 is further configured to acquire the weight of the workpiece on the workbench 310; the other is the real-time rotating speed of the rotating shaft 322. The compensation module 620 is configured to control the action of the rotary table according to the real-time rotating speed of the workbench 310 and the weight of the workpiece on the workbench 310.

[0053] The compensation system 600 comprises a compensation amount module, and the compensation amount module stores the rotary compensation amount of the rotary table under different rotating speed intervals of the workbench 310 and different weight intervals of the workpiece on the workbench 310. The compensation module 620 is further connected with the compensation amount module, configured to acquire the rotary compensation amount from the compensation amount module, and configured to control the action of the rotary table according to the rotary compensation amount.

[0054] The following takes a horizontal machining center as an example, which can be a four-axis machining center. In this embodiment, the horizontal machining center is a five-axis machining center, the workbench 310 has a maximum load of 800 kilograms, and the rotary table has a maximum rotating speed of 160 revolutions per minute, which is only used as an example.

[0055] The maximum load of the workbench 310 and the rotating speed of the rotary table can be increased or decreased according to actual conditions. The rotating speed of the rotary table has three gears of high speed, medium speed and low speed, and the weight of the workpiece has three gears of light, heavy and super heavy. It can be understood that the interval of the medium speed is 60 revolutions per minute to 130 revolutions per minute, and the highest speed of the high speed is 160 revolutions per minute. The interval of the heavy gear is 300 kilograms to 600 kilograms, and the maximum of the super heavy gear is 800 kilograms.

[0056] When the rotating speed of the rotating table is low, the weight of the workpiece is in the light range, and the error of the rotating table is extremely small, so compensation is not needed. When the rotating speed of the rotating table is medium, the weight of the workpiece is in the heavy range, compensation is needed. When the rotating speed of the rotating table is medium, the weight of the workpiece is in the super heavy range, compensation is needed. When the rotating speed of the rotating table is high, the weight of the workpiece is in the heavy range, compensation is needed. When the rotating speed of the rotating table is high, the weight of the workpiece is in the super heavy range, compensation is needed. A test workpiece with a preset weight can be installed, the rotating speed of the rotating table is pre-adjusted, the rotating speed of the top of the rotating table assembly 300 is measured, and then the rotating speed of the bottom of the rotating table assembly 300 measured by the rotation amount sensor 400 is subtracted to obtain a compensation amount. In actual machining, the real rotating speed of the rotating table at the moment is obtained according to the rotating speed of the bottom of the rotating table assembly 300 and the compensation amount, so as to make up for the torque delay caused by the length of the rotating shaft 322 and improve the machining precision.

[0057] Obviously, various modifications and variations of the present application can be made without departing from the broad scope and spirit of the application. Accordingly, it should be understood that the application is intended to cover all modifications and variations of this application within the scope of the appended claims and their equivalents. It is therefore intended that this application cover all such modifications and variations as fall within the scope of the claims.

[0058] The above only lists the preferred embodiments of the present application, and of course cannot limit the scope of the present application, so equivalent changes made according to the claims of the present application and their equivalents still belong to the scope of the present application. The above only lists the preferred embodiments of the present application, and of course cannot limit the scope of the present application, so equivalent changes made according to the claims of the present application and their equivalents still belong to the scope of the present application.

Claims

1. A rotary table comprising a fixed base assembly (100), a rotary table bearing (200), a rotary table assembly (300), the rotary table assembly (300) being rotatably connected to the fixed base assembly (100) by the rotary table bearing (200), characterized in that, Also include a rotation amount sensor (400), the fixed seat assembly (100) includes a shell (110), the oil distribution shaft sleeve (120) is arranged in the shell (110), the oil distribution shaft sleeve (120) extends from the bottom to the top of the shell (110); The rotating table assembly (300) includes a workbench (310), a connecting seat (320) arranged below the workbench (310), the connecting seat (320) includes a rotating table (321) connected with the workbench (310), a rotating shaft (322) connected with the rotating table (321) and extending from the top to the bottom, the workbench (310) is located above the shell (110), and the rotating shaft (322) is inserted into the oil distribution shaft sleeve (120); Wherein, the bottom of the oil distribution shaft sleeve (120) is provided with a containing space (X), and the rotation amount sensor (400) is arranged in the containing space (X) for sensing the rotation amount of the rotating table assembly (300) relative to the fixed seat assembly (100).

2. The turntable of claim 1, wherein The rotation amount sensor (400) includes a reading disc (410) and a grating ruler disc (420) stacked vertically, the reading disc (410) and the grating ruler disc (420) are inductive cooperation, the reading disc (410) is installed at the bottom of the rotating shaft (322), and the grating ruler disc (420) is installed at the bottom of the oil distribution shaft sleeve (120). The oil distribution shaft sleeve (120) has a through hole (121) vertically penetrating the oil distribution shaft sleeve (120), and the bottom of the through hole (121) forms the containing space (X).

3. The turntable of claim 2 wherein, The projection area of the reading disc (410) along the rotation axis (L) is greater than the projection area of the rotating shaft (322) along the rotation axis (L), the reading disc (410) includes a mounting portion (411) at the inner ring and a reading portion (412) at the outer ring, the mounting portion (411) is vertically stacked below the rotating shaft (322), and the reading portion (412) is vertically located in the through hole (121) of the oil distribution shaft sleeve (120).

4. The turntable of claim 3 wherein, The reading disc (410) is annular, the bottom of the rotating shaft (322) is provided with a positioning protrusion (3221), and the annular reading disc (410) is positioned and matched with the positioning protrusion (3221) of the rotating shaft (322). The bottom of the oil distribution shaft sleeve (120) is provided with a positioning groove (122) in communication with the through hole (121) of the oil distribution shaft sleeve (120), and the grating ruler disc (420) is positioned and matched with the positioning groove (122) of the oil distribution shaft sleeve (120).

5. The turntable of claim 4 wherein, Also include an adjusting ring (123), the grating ruler disc (420) is vertically mounted on the groove top wall of the positioning groove (122) through the adjusting ring (123), and the distance between the grating ruler disc (420) and the reading disc (410) in the vertical direction is changed by replacing the adjusting ring (123) with different thickness or changing the number of the adjusting ring (123). The grating scale disc (420) is annular, and the grating scale disc (420) is provided with a clearance (421) at an inner ring close to the rotation axis (L), and the mounting portion (411) is located in the clearance (421) of the grating scale disc (420) along the direction of the rotation axis; the grating scale disc (420) comprises a grating inner ring (423) at the outer periphery of the clearance (421) and a fixed outer ring (422), the fixed outer ring (422) is mounted on the hole wall at the bottom of the through hole (121) of the oil distribution shaft sleeve (120), the grating inner ring (423) is located in the through hole (121) of the oil distribution shaft sleeve (120) in the vertical direction, and the reading portion (412) is vertically directed to the grating inner ring (423).

6. A turntable as claimed in any one of claims 1 to 5, wherein, Further comprising a motor support seat (130) arranged between the housing (110) and the oil distribution shaft sleeve (120) in a radial direction, wherein the radial direction is perpendicular to the rotation axis (L) of the rotary table assembly (300), and the motor support seat (130) is further provided with a wire passing hole; Further comprising a direct drive motor (500) and a connecting wire connected with the direct drive motor (500), the direct drive motor (500) is arranged on the motor support seat (130), and the connecting wire passes through the wire passing hole.

7. A machine tool comprising a base, characterised in that, Further comprising the rotary table according to any one of claims 1-6, and the rotary table is mounted on the base.

8. A machine tool according to claim 7, characterised in that Further comprising a compensation system (600), the compensation system (600) comprises: An acquisition module (610) connected with the rotation amount sensor (400) and configured to acquire a real-time rotating speed of the workbench (310); A compensation module (620) connected with the acquisition module (610) and configured to control the action of the rotary table according to the real-time rotating speed of the workbench (310).

9. Machine tool according to claim 8, characterized in that The acquisition module (610) is further configured to acquire the weight of the workpiece on the workbench (310), and the compensation module (620) is configured to control the action of the rotary table according to the real-time rotating speed of the workbench (310) and the weight of the workpiece on the workbench (310).

10. The machine tool according to claim 8, characterized in that The compensation system (600) comprises a compensation amount module, the compensation amount module stores the rotation compensation amount of the rotary table under different rotating speed intervals of the workbench (310) and different weight intervals of the workpiece on the workbench (310), the compensation module (620) is further connected with the compensation amount module, configured to acquire the rotation compensation amount from the compensation amount module, and configured to control the action of the rotary table according to the rotation compensation amount.

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