A stable running turntable

Abstract

The utility model discloses a kind of rotation tables of stable operation, including rotation table box, driving motor, rotating output shaft, transmission assembly, rotation table rotating seat, tool fixture and brake assembly, the rotating output shaft and the transmission assembly are configured in the rotation table box, the driving motor is rotated by the transmission assembly driving the rotating output shaft, the rotation table rotating seat is rotatably configured in the top of the rotation table box and is connected with the rotating output shaft, the tool fixture is connected in the top of the rotation table rotating seat, the brake assembly is configured in the end of the rotating output shaft, brake assembly includes feedback type flow regulating valve, feedback type flow regulating valve includes with the valve seat of first brake flange seat connection, detachably set on the cover plate of valve seat, and the diaphragm between valve seat and cover plate is configured.The rotation table of the utility model can brake output shaft according to the size of rotation table load, improves machine tool overall stability.

Description

Technical Field

[0001] This utility model relates to the field of five-axis machining equipment technology, specifically to a rotary table that operates stably. Background Technology

[0002] CNC machine tools, short for numerical control machine tools, are automated machine tools equipped with a program control system. This control system can logically process programs with control codes or other symbolic instructions, decode them, represent them with coded numbers, and input them into the CNC device via an information carrier. After processing, the CNC device sends out various control signals to control the machine tool's movements, automatically machining parts according to the shape and dimensions required by the drawings.

[0003] A rotary table is an important accessory for CNC machine tools. It is used to hold and fix the workpiece to be processed, and to drive the workpiece to rotate so that the CNC machine tool can perform multi-faceted processing operations on the workpiece in a single clamping.

[0004] There are two common types of braking devices for the first output shaft of a rotary table: one is normally open when power is off (pneumatic), which means braking is achieved when power is on (pneumatic), and the other is normally closed when power is off (pneumatic), which means braking is achieved when power is off (pneumatic). The normally open mode is generally used when the driving force of the first output shaft is too small, and external hydraulic oil or compressed air is used to brake and hold the first output shaft, allowing the machine tool to perform heavy cutting. However, this normally open mode cannot solve the problem of braking when the machine tool suddenly loses power. Therefore, if the machine tool suddenly loses power during operation, cannot be powered during transportation, or may lose power due to human error during the machining and assembly process, the magnetic torque of the direct drive torque motor against gravity will suddenly disappear at the moment of power failure. This will cause the rotary table to suddenly drop under the action of gravity, resulting in left and right swaying, damaging the machine tool or injuring personnel, and causing huge economic losses. Utility Model Content

[0005] The purpose of this invention is to provide a turntable that operates stably, so as to solve the technical problems mentioned in the background art.

[0006] To achieve the above-mentioned utility model objectives, the technical solution adopted by this utility model is as follows: a stable operating turntable, comprising a turntable housing, a drive motor, a rotary output shaft, a transmission assembly, a turntable rotating seat, a tooling fixture, and a brake assembly. The rotary output shaft and the transmission assembly are both disposed within the turntable housing. The drive motor drives the rotary output shaft to rotate through the transmission assembly. The turntable rotating seat is rotatably disposed above the turntable housing and connected to the rotary output shaft. The tooling fixture is connected above the turntable rotating seat. The brake assembly is disposed at the end of the rotary output shaft.

[0007] The brake assembly includes a brake flange seat, a brake driven pad fixed on the rotary output shaft, a brake stationary pad fixedly connected to the brake flange seat and partially located below the brake driven pad, a brake pressure plate movably disposed within the brake flange seat and located below the brake stationary pad, and a plurality of feedback flow control valves disposed outside the brake flange seat. The brake flange seat has a pressure plate groove, and the brake pressure plate is disposed in the pressure plate groove and has the freedom to float up and down. Each feedback flow control valve includes a valve seat connected to the brake flange seat, a cover plate detachably disposed on the valve seat, and a diaphragm disposed between the valve seat and the cover plate. The end face of the valve seat facing the cover plate has a cavity. The diaphragm is disposed in the cavity and surrounds the valve seat to form a pressure stabilizing cavity. The diaphragm and the cover plate surround a regulating cavity. The valve seat has an oil inlet and an oil outlet. The oil inlet communicates with the regulating cavity, and the oil outlet communicates with both the pressure stabilizing cavity and the pressure plate groove.

[0008] Furthermore, a throttling boss is provided in the middle part of the cavity, and the throttling boss is provided with the oil outlet along the axial direction, and the oil outlet extends to the bottom of the valve seat;

[0009] The brake flange seat has multiple pressure inlet channels that communicate with the pressure plate groove, and the pressure inlet channels are connected to the oil outlet.

[0010] Furthermore, the valve seat is also provided with a first annular flow channel, a second annular flow channel, a first throttling channel, and a second throttling channel. The first annular flow channel and the second annular flow channel are both located at the bottom of the valve seat, and the first annular flow channel surrounds the outer periphery of the second annular flow channel and is coaxially arranged with the second annular flow channel. The first annular flow channel is connected to the oil inlet and the second annular flow channel respectively, and the second annular flow channel is connected to the oil outlet. The two ends of the first throttling channel are connected to the first annular flow channel and the pressure stabilizing chamber respectively, and the two ends of the second throttling channel are connected to the first annular flow channel and the regulating chamber respectively.

[0011] Furthermore, the brake assembly also includes a shaft seal, which is sleeved on the lower end of the rotary output shaft via a first deep groove ball bearing. The lower end face of the shaft seal is provided with an annular mounting groove. The brake flange seat and the brake stationary pad are both disposed in the mounting groove and are fixedly connected to the shaft seal by bolts.

[0012] Furthermore, the transmission assembly includes an integral arc-shaped camshaft, a needle roller bearing, a drive gear, and a driven gear. The integral arc-shaped camshaft is rotatably configured within the turntable housing and is perpendicular to the rotary output shaft. The needle roller bearing is fixed to the lower end of the rotary output shaft and meshes with the integral arc-shaped camshaft for transmission. The drive gear is fixed to the output shaft of the drive motor, and the driven gear is fixed to the integral arc-shaped camshaft and meshes with the drive gear.

[0013] Furthermore, the stably operating turntable also includes multiple conical assemblies for connecting the tooling fixture to the turntable rotating base. The conical assemblies include an upper conical seat connected to the tooling fixture and a lower conical seat assembly connected to the turntable rotating base.

[0014] Furthermore, the lower end of the tooling fixture is provided with at least two countersunk holes, and the upper cone seat is disposed in the countersunk holes.

[0015] Furthermore, the lower conical seat assembly includes a lower conical seat, a conical seat pull ring, a conical seat center rod, a compression spring, bearing steel balls, and a tool holder pull stud. The upper end of the lower conical seat is provided with at least two through holes. The conical seat pull ring is disposed in the lower conical seat. The conical seat pull ring has an upper channel and a lower channel that are interconnected. There is an abutment ring between the upper channel and the lower channel. The conical seat center rod is movably disposed in the upper channel and the lower channel. The tool holder pull stud is movably disposed in the upper channel and fixedly connected to the conical seat center rod. The compression spring is sleeved on the conical seat center rod and located between the abutment ring and the lower conical seat. The upper end of the conical seat pull ring is provided with at least three steel ball holes along the circumferential direction. The bearing steel balls are movably disposed in the steel ball holes.

[0016] Furthermore, the lower cone seat is inserted into the upper cone seat, and the upper end of the lower cone seat is pushed outward under the action of the bearing steel ball and locked with the upper cone seat.

[0017] Furthermore, the upper end face of the turntable rotating base is provided with at least two mounting slots, and the lower cone base can be detachably fixed in the mounting slots.

[0018] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0019] The rotary table of this utility model has a braking assembly, which includes a feedback flow regulating valve. The feedback flow regulating valve can adjust the oil pressure flow rate input to the braking device according to the load. The greater the load pressure, the greater the flow rate, thereby stably braking the output shaft and ensuring that the output shaft cannot rotate. This prevents the output shaft from rotating even when subjected to cutting forces in all directions during part processing, ensuring the positioning and machining accuracy of the parts. At the same time, it prevents the rotary table from suddenly falling under the action of gravity, avoiding damage to the machine tool or injury to personnel. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of a turntable that operates stably according to this utility model.

[0021] Figure 2 for Figure 2 Enlarged view of section A in the middle;

[0022] Figure 3 This is a perspective view of the feedback-type flow regulating valve of this utility model;

[0023] Figure 4 This is a front view of the valve seat of this utility model;

[0024] Figure 5 This is a front view of the cover plate of this utility model;

[0025] Figure 6 This is an exploded view of the components of the cone seat assembly of this utility model. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0027] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0028] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the present invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0029] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0030] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] Reference Figure 1 This disclosure provides a stable operating turntable, including a turntable housing 51, a drive motor 57, a rotary output shaft 54, a transmission assembly 56, a turntable rotating seat 50, a tooling fixture 52, and a brake assembly 58. The rotary output shaft 54 ​​and the transmission assembly 56 are both disposed inside the turntable housing 51. The drive motor 57 drives the rotary output shaft 54 ​​to rotate through the transmission assembly 56. The turntable rotating seat 50 is rotatably disposed above the turntable housing 51 and connected to the rotary output shaft 54. The tooling fixture 52 is connected above the turntable rotating seat 50. The brake assembly 58 is disposed at the end of the rotary output shaft 54.

[0033] Brake assembly 58 includes a brake flange seat 581 detachably fixed in the rotating housing, a brake driven pad 584 fixed on the rotating output shaft 54, a brake stationary pad 583 fixedly connected to the brake flange seat 581 and partially located below the brake driven pad 584, a brake pressure plate 582 movably disposed in the brake flange seat 581 and located below the brake stationary pad 583, and a plurality of feedback flow control valves 6 disposed on the outside of the brake flange seat 581. A pressure plate groove 5810 is provided in the brake flange seat 581, and the brake pressure plate 582 is disposed in the pressure plate groove 5810 and has an upper... The floating degree of freedom of the feedback flow control valve 6 includes a valve seat 61 connected to the brake flange seat 581, a cover plate 62 detachably mounted on the valve seat 61, and a diaphragm plate disposed between the valve seat 61 and the cover plate 62. The end face of the valve seat 61 facing the cover plate 62 is provided with a cavity 610. The diaphragm plate is disposed in the cavity 610 and surrounds the valve seat 61 to form a pressure stabilizing cavity. The diaphragm plate and the cover plate 62 surround to form an adjusting cavity. The valve seat 61 has an oil inlet 616 and an oil outlet 611. The oil inlet 616 communicates with the adjusting cavity, and the oil outlet 611 communicates with the pressure stabilizing cavity and the pressure plate groove 5810, respectively.

[0034] In some embodiments, the brake assembly 58 further includes a shaft seal 585 connected to the rotating housing. The shaft seal 585 is coaxially arranged with the rotary output shaft 54 ​​and is sleeved on the lower end of the rotary output shaft 54 ​​by a deep groove ball bearing. The lower end face of the shaft seal 585 is provided with an annular mounting groove. The brake flange seat 581 and the brake stationary plate 583 are both disposed in the mounting groove and are fixedly connected to the shaft seal 585 by bolts.

[0035] When the turntable needs to decelerate or brake, hydraulic oil can be introduced into the pressure plate groove 5810 through the feedback regulating valve 6. The hydraulic oil forces the brake pressure plate 582 to move upward to push the brake stationary pad 583 and the brake driven pad 584 to overlap on the groove wall of the mounting groove, thereby braking the rotating output shaft 54.

[0036] In some embodiments, a throttling boss 617 is provided in the middle of the cavity 610, and the throttling boss 617 has an oil outlet 611 along the axial direction, extending to the bottom of the valve seat 61. The brake flange seat 581 has multiple oil inlet channels 2411 communicating with the pressure plate groove 5810, and the oil inlet channels 2411 are connected to the oil outlets 611. The brake flange seat 581 is also provided with an oil outlet channel, which is connected to the pressure plate groove 5810 for discharging hydraulic oil from the pressure plate groove 5810.

[0037] In some embodiments, the valve seat 61 is further provided with a first annular flow channel 612, a second annular flow channel 613, a first throttling channel 614, and a second throttling channel 615. The first annular flow channel 612 and the second annular flow channel 613 are both provided at the bottom of the valve seat 61, and the first annular flow channel 612 surrounds the outer periphery of the second annular flow channel 613 and is coaxially arranged with the second annular flow channel 613. The first annular flow channel 612 is connected to the oil inlet 616 and the second annular flow channel 613 respectively. The second annular flow channel 613 is connected to the oil outlet 611. The two ends of the first throttling channel 614 are connected to the first annular flow channel 612 and the pressure stabilizing chamber respectively. The two ends of the second throttling channel 615 are connected to the first annular flow channel 612 and the regulating chamber respectively.

[0038] During braking, the oil enters through the inlet 616 and then flows in two directions: one path enters the first annular flow channel 612, then the pressure stabilizing chamber and the second annular flow channel 613, and finally the outlet 611, supplying oil to the pressure plate groove 5810; the other path flows from the first annular flow channel 612 through the second throttling channel 615 into the regulating chamber. When there is no other load on the clamping platform 3, the pressure Po at the outlet 611 is relatively low, the oil pressure in the pressure stabilizing chamber is lower than the oil pressure in the regulating chamber, the diaphragm is bent downwards under pressure, the gap between the throttling boss 617 and the diaphragm is zero, and the flow rate at the outlet 611 is at its minimum. When a load is applied to the clamping table 3, the oil pressure in the pressure plate groove 5810 increases due to the pressure applied by the load. The oil pressure in the pressure stabilizing chamber increases accordingly. The pressure in the regulating chamber is less than the pressure in the pressure stabilizing chamber, and the original balance of the feedback regulating valve 6 is broken. The diaphragm bends towards the cover plate 22, and the gap between the diaphragm and the throttling boss 617 increases. The hydraulic oil in the pressure stabilizing chamber can flow into the oil outlet 611 and into the pressure plate groove 5810 through the gap between the throttling boss 617 and the diaphragm, thereby realizing feedback regulation. This stabilizes and brakes the output shaft, ensuring that the output shaft cannot rotate. This prevents the output shaft from rotating when subjected to cutting forces in all directions during part processing, ensuring the positioning and machining accuracy of the parts. At the same time, it prevents the turntable from suddenly falling under the action of gravity, avoiding damage to the machine tool or injury to personnel.

[0039] In some embodiments, the end of the cover plate 62 facing the valve seat 61 is provided with a protrusion 622, the protrusion 622 is inserted into the adjustment cavity, and the insertion end of the protrusion 622 is provided with a spiral groove 621.

[0040] In some embodiments, the turntable also includes an oil distributor 53, which is vertically arranged along the center line of the turntable rotating base 50. The turntable rotating base 50 is provided with an oil inlet channel, an oil outlet channel, and an air outlet channel. The oil inlet channel and the oil outlet channel are connected to the oil distributor 53, and oil is supplied to the feedback regulating valve 6 through the oil distributor 53.

[0041] In some embodiments, the transmission assembly 56 includes an integral arcuate camshaft, a needle roller bearing, a drive gear, and a driven gear. The integral arcuate camshaft is rotatably configured within the turntable housing 51 and is perpendicular to the rotary output shaft 54. The needle roller bearing is fixed to the lower end of the rotary output shaft 54 ​​and meshes with the integral arcuate camshaft for transmission. The drive gear is fixed to the output shaft of the drive motor 57, and the driven gear is fixed to the integral arcuate camshaft and meshes with the drive gear.

[0042] In some embodiments, the stably operating turntable also includes multiple cone assemblies for connecting the tooling fixture 52 to the turntable rotator 50, the cone assemblies including an upper cone 557 connected to the tooling fixture 52 and a lower cone assembly connected to the turntable rotator 50.

[0043] Furthermore, the lower end of the tooling fixture 52 is provided with at least two countersunk holes, and the upper cone seat 557 is disposed in the countersunk holes.

[0044] Furthermore, the lower conical seat assembly includes a lower conical seat 551, a conical seat pull ring 552, a conical seat center rod 553, a compression spring 555, bearing steel balls 556, and a tool holder pull stud 554. The upper end of the lower conical seat 551 is provided with at least two through holes. The conical seat pull ring 552 is disposed in the lower conical seat 551. The conical seat pull ring 552 has an upper channel and a lower channel that are interconnected. There is an abutment ring between the upper channel and the lower channel. The conical seat center rod 553 is movably disposed in the upper channel and the lower channel. The tool holder pull stud 554 is movably disposed in the upper channel and is fixedly connected to the conical seat center rod 553. The compression spring 555 is sleeved on the conical seat center rod 553 and located between the abutment ring and the lower conical seat 551. The upper end of the conical seat pull ring 552 is provided with at least three steel ball holes along the circumferential direction. The bearing steel balls 556 are movably disposed in the steel ball holes.

[0045] Furthermore, the lower cone seat 551 is inserted into the upper cone seat 557, and the upper end of the lower cone seat 551 is pushed outward under the action of the bearing steel ball 556 and locked with the upper cone seat 557.

[0046] Furthermore, the upper end face of the turntable swivel base 50 is provided with at least two mounting slots, and the lower cone base 551 can be detachably fixed in the mounting slots.

[0047] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to the above embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A stable running turntable, characterized in that, The assembly includes a turntable housing (51), a drive motor (57), a rotary output shaft (54), a transmission assembly (56), a turntable rotating seat (50), a tooling fixture (52), and a brake assembly (58). The rotary output shaft (54) and the transmission assembly (56) are both disposed inside the turntable housing (51). The drive motor (57) drives the rotary output shaft (54) to rotate through the transmission assembly (56). The turntable rotating seat (50) is rotatably disposed above the turntable housing (51) and connected to the rotary output shaft (54). The tooling fixture (52) is connected above the turntable rotating seat (50). The brake assembly (58) is disposed at the end of the rotary output shaft (54). The brake assembly (58) includes a brake flange seat (581), a brake driven pad (584) fixed on the rotary output shaft (54), a brake stationary pad (583) fixedly connected to the brake flange seat (581) and partially located below the brake driven pad (584), a brake pressure plate (582) movably disposed within the brake flange seat (581) and located below the brake stationary pad (583), and a plurality of feedback flow control valves (6) disposed outside the brake flange seat (581). The brake flange seat (581) has a pressure plate groove (5810), and the brake pressure plate (582) is disposed within the pressure plate groove (5810) and has the freedom to float up and down. The feedback flow control valves... (6) Includes a valve seat (61) connected to the brake flange seat (581), a cover plate (62) detachably disposed on the valve seat (61), and a diaphragm sheet disposed between the valve seat (61) and the cover plate (62). The valve seat (61) has a cavity (610) on its end face facing the cover plate (62). The diaphragm sheet is disposed in the cavity (610) and surrounds the valve seat (61) to form a pressure stabilizing cavity. The diaphragm sheet and the cover plate (62) surround to form an adjusting cavity. The valve seat (61) has an oil inlet (616) and an oil outlet (611). The oil inlet (616) communicates with the adjusting cavity. The oil outlet (611) communicates with the pressure stabilizing cavity and the pressure plate groove (5810) respectively.

2. The stable running turntable as claimed in claim 1, wherein, A throttling boss (617) is provided in the middle part of the cavity (610), and the throttling boss (617) is provided with the oil outlet (611) along the axial direction. The oil outlet (611) extends to the bottom of the valve seat (61). The brake flange seat (581) has multiple oil inlet channels (5811) that communicate with the pressure plate groove (5810), and the oil inlet channels (5811) are connected to the oil outlet (611).

3. The stable running turntable of claim 1, wherein, The valve seat (61) is also provided with a first annular flow channel (612), a second annular flow channel (613), a first throttling channel (614), and a second throttling channel (615). The first annular flow channel (612) and the second annular flow channel (613) are both located at the bottom of the valve seat (61). The first annular flow channel (612) surrounds the outer periphery of the second annular flow channel (613) and is coaxially arranged with the second annular flow channel (613). The first annular flow channel (612) is connected to the oil inlet (616) and the second annular flow channel (613) respectively. The second annular flow channel (613) is connected to the oil outlet (611). The two ends of the first throttling channel (614) are connected to the first annular flow channel (612) and the pressure stabilizing chamber respectively. The two ends of the second throttling channel (615) are connected to the first annular flow channel (612) and the regulating chamber respectively.

4. The stable running turntable of claim 1, wherein: The brake assembly (58) also includes a shaft seal (585), which is sleeved on the lower end of the rotary output shaft (54) by a first deep groove ball bearing. The lower end face of the shaft seal (585) is provided with an annular mounting groove. The brake flange seat (581) and the brake stationary pad (583) are both arranged in the mounting groove and are fixedly connected to the shaft seal (585) by bolts.

5. The stable running turntable as claimed in claim 1, wherein, The transmission assembly (56) includes an integral arc-shaped camshaft, a needle roller bearing, a drive gear, and a driven gear. The integral arc-shaped camshaft is rotatably disposed within the turntable housing (51) and is perpendicular to the rotary output shaft (54). The needle roller bearing is fixed to the lower end of the rotary output shaft (54) and meshes with the integral arc-shaped camshaft for transmission. The drive gear is fixed on the output shaft of the drive motor (57), and the driven gear is fixed on the integral arc-shaped camshaft and meshes with the drive gear.

6. A stable running turntable as claimed in any one of claims 1 to 5, characterized in that The stable-operating turntable also includes multiple cone assemblies for connecting the tooling fixture (52) above the turntable rotating seat (50), the cone assemblies including an upper cone (557) connected to the tooling fixture (52) and a lower cone assembly connected to the turntable rotating seat (50).

7. The stable running turntable of claim 6, wherein, The lower end of the tooling fixture (52) is provided with at least two countersunk holes, and the upper cone seat (557) is disposed in the countersunk holes.

8. The stable running turntable as claimed in claim 6, wherein, The lower conical seat assembly includes a lower conical seat (551), a conical seat pull ring (552), a conical seat center rod (553), a compression spring (555), a bearing steel ball (556), and a tool holder pull stud (554). The upper end of the lower conical seat (551) is provided with at least two through holes. The conical seat pull ring (552) is disposed within the lower conical seat (551). The conical seat pull ring (552) has an upper channel and a lower channel that communicate with each other. An abutment ring is provided between the upper channel and the lower channel. The center rod (553) is movably disposed in the upper channel and the lower channel. The tool holder pull stud (554) is movably disposed in the upper channel and fixedly connected to the center rod (553) of the cone seat. The compression spring (555) is sleeved on the center rod (553) of the cone seat and located between the abutment ring and the lower cone seat (551). The upper end of the cone seat pull ring (552) is provided with at least three steel ball holes along the circumferential direction. The bearing steel ball (556) is movably disposed in the steel ball hole.

9. The stable-operating turntable as described in claim 8, characterized in that, The lower cone (551) is inserted into the upper cone (557), and the upper end of the lower cone (551) is pushed outward by the bearing steel ball (556) and locked with the upper cone (557).

10. The stable-operating turntable as described in claim 8, characterized in that, The upper end face of the turntable rotating seat (50) is provided with at least two mounting slots, and the lower cone seat (551) can be detachably fixed in the mounting slots.

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