Adjustable rotary table for machine tool machining

Abstract

The invention relates to the technical field of machine tool rotary tables, in particular to an adjustable rotary table for machine tool machining, which comprises a protective cover mounted on a machine tool and used for protection, a worm I and a worm II which coaxially rotate are assembled in the protective cover, and a worm gear group meshed with the worm I and a synchronous worm gear meshed with the worm II are assembled in the protective cover. A linkage mechanism used for sharing the load of the first worm and reducing friction loss is assembled in the protective cover. One end of the worm is provided with a driving mechanism used for driving the worm to move in the axial direction to compensate abrasion. By arranging the balls, the two first gears, the half-threaded rod and the cleaning mechanism, sudden shutdown of the rotary table is prevented and unnecessary economic loss is reduced from three dimensions of reducing abrasion of the first worm and the synchronous worm gear, compensating for the distance generating abrasion and preventing sweeps from entering the protective cover.

Description

Technical Field

[0001] The invention relates to the technical field of machine tool turntables, and particularly provides an adjustable turntable for machine tool processing. Background Art

[0002] A turntable is a mechanical device that enables a workpiece or equipment to rotate within a specific plane. It is driven in different ways. Usually, the speed of the turntable is adjusted by adjusting the drive. The turntable includes multiple structures such as a rotating shaft, a table transmission device and a control system. Its transmission methods include direct drive, worm gear drive, gear drive, belt drive and chain drive. Among them, worm gear drive is mainly used in processing environments with high-precision indexing and low-speed stable rotation. When the lead angle of the worm is less than the friction angle, the transmission has self-locking properties, so it is also often used in environments that require mechanical self-locking.

[0003] In the process of the worm driving the worm wheel, the sliding friction of the worm wheel and worm leads to low transmission efficiency, which will cause greater tooth surface wear. Therefore, after the worm rotates as the power source, the response speed of the worm wheel rotation will gradually decrease, thereby affecting the processing accuracy of the workpiece. When it wears to a certain extent, the worm wheel tooth gap becomes larger, resulting in abnormal meshing, which will cause the turntable to jam. During the processing, the waste chips generated enter the interior through the gap of the turntable rotation, which can easily cause the turntable to jam, resulting in greater economic losses. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides an adjustable turntable for machine tool processing, which is used to solve the problems mentioned in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: an adjustable turntable for machine tool processing, including a protective cover installed on the machine tool for protection, the interior of the protective cover is equipped with coaxially rotating worm 1 and worm 2, the interior of the protective cover is equipped with a worm gear group meshing with worm 1 and a synchronous worm gear meshing with worm 2, the interior of the protective cover is equipped with a linkage mechanism for sharing the load of worm 1 and reducing friction loss; the end of worm 1 is equipped with a driving mechanism for driving it to move axially to compensate for wear, and the top of the protective cover is equipped with a turntable that rotates coaxially with the worm gear group; the lower surface of the turntable is equipped with a cleaning mechanism for preventing waste chips from entering the rotating gap of the turntable, and the surface of the turntable is equipped with a threaded rod for lifting and lowering the cleaning mechanism against the surface of the protective cover for cleaning; the surface of the worm gear group meshing with worm 1 is inlaid with a plurality of balls for reducing friction.

[0006] Preferably, the interior of the protective cover is equipped with a rotatable circular shaft, worm gear 2 is fixedly installed on the surface of the circular shaft, the surface of the circular shaft is equipped with a strip-shaped guide rod for limiting, worm gear 1 is movably sleeved on the surface of the circular shaft, and a through groove is provided on the inner side of worm gear 1 for the guide rod to pass through, and the driving mechanism is assembled inside the protective cover.

[0007] Preferably, the driving mechanism includes a movable plate fixedly sleeved on the surface of worm one and capable of moving with worm one, a positioning plate fixedly mounted on the surface of worm two, a semi-threaded rod mounted on the surface of the positioning plate through a bearing, the threaded portion of the semi-threaded rod threads through the surface of the movable plate, the non-threaded end of the semi-threaded rod is fixedly sleeved with gear two, and the interior of the protective cover is equipped with a rack mechanism that meshes with gear two and prevents gear two from excessive rotation to compensate for excessive wear.

[0008] Preferably, the linkage mechanism includes two mutually meshing gears 1, and the two gears 1 are coaxially mounted with the worm gear set and the synchronous worm gear respectively.

[0009] Preferably, a T-shaped slider is fixedly installed on the side of the rack mechanism, and a guide groove adapted to the shape of the slider is opened inside the protective cover. The slider is movably inserted into the inside of the guide groove and moves. The inside of the protective cover is equipped with an electric push rod for driving the rack mechanism away from gear two.

[0010] Preferably, the rack mechanism includes an arc-shaped base plate assembled inside the protective cover, an arc-shaped array of grooves is opened on the inner side of the arc-shaped base plate, a connecting spring and a tooth block are assembled inside the groove, and the tooth block is fixed to one end of the connecting spring.

[0011] Preferably, the worm gear set includes a worm gear base in which each tooth is half, and the surface of the worm gear base is equipped with multiple half teeth to form a worm gear, and circular grooves with arc-shaped ends are opened on the opposite sides of the worm gear base and the half teeth. The ball is assembled inside the circular groove, and the surface of the ball is against the contact surface of the half teeth and the worm gear base. The surface of the worm gear base is equipped with a fixing mechanism for clamping and fixing.

[0012] Preferably, the fixing mechanism includes an external threaded tube assembled on the top and bottom of the worm gear base, the surface of the external threaded tube is threadedly sleeved with an anti-slip ring that rests against the half teeth and the surface of the worm gear base, the end of the half teeth is equipped with an arc-shaped fixing plate, and the surface of the anti-slip ring is provided with an annular groove for placing the fixing plate.

[0013] Preferably, gear 1 and the worm gear set are installed through a movable shaft, a long groove along the axial direction is opened on the surface of the movable shaft, and a mounting tube with a protrusion inside is provided in the middle of the turntable and is clamped on the movable shaft.

[0014] Preferably, the cleaning mechanism includes a connecting rod arranged along the radial direction of the turntable, and a plurality of inclined cleaning rods are equidistantly installed on the surface of the connecting rod, the end portions of the projections of adjacent cleaning rods in the vertical diameter direction partially overlap, and the two cleaning rods are installed and connected by a semicircular arc rod, and the threaded rod threads through the arc rod. Two arc grooves are provided on the surface of the turntable, and the arc rod and the threaded rod are both placed inside the arc grooves.

[0015] 1. The above technical solution has the following advantages or beneficial effects: The present invention provides an adjustable turntable for machine tool processing. By arranging a worm gear group, a synchronous worm gear and two gears 1, the load pressure on the worm gear group is distributed to worm 1 and gear 1, which can effectively slow down the wear between worm 1 and worm gear group, minimize the impact of lead jamming caused by excessive tooth clearance of the worm gear group, extend the service life, and reduce unnecessary cost losses.

[0016] 2. The above technical solution has the following advantages or beneficial effects: The present invention provides an adjustable turntable for machine tool processing, which reduces the friction between worm one and the worm gear group by arranging balls on the surface of the worm gear group, thereby slowing down the wear between worm one and the worm gear group, slowing down the expansion of the worm gear tooth gap, and minimizing the economic losses caused by sudden jamming of the turntable.

[0017] 3. The above technical solution has the following advantages or beneficial effects: The present invention provides an adjustable turntable for machine tool processing. By setting a multi-level cleaning rod, the turntable itself rotates to drive the cleaning rod to rotate. Since the projected ends of two adjacent cleaning rods in the vertical diameter direction are partially overlapped, the waste chips can be cleaned out step by step when cleaning waste chips, effectively reducing the risk of the worm being stuck during rotation and reducing unnecessary economic losses.

[0018] 4. The above technical solution has the following advantages or beneficial effects: The present invention provides an adjustable turntable for machine tool processing, in which the axial position of worm one is adjustable. By setting a semi-threaded rod, gear two and rack mechanism, when the worm gear set and worm one are worn, the semi-threaded rod is used to drive worm one to move axially to compensate for the wear. It can also prevent emergency stops caused by excessive tooth clearance, effectively reducing unnecessary economic losses.

[0019] 5. The above technical solution has the following advantages or beneficial effects: The present invention provides an adjustable turntable for machine tool processing. By arranging ball bearings, two gears, a semi-threaded rod and a cleaning mechanism, it can prevent the turntable from suddenly stopping and reduce unnecessary economic losses from three dimensions: reducing the wear of the worm and the synchronous worm gear, compensating the distance where the wear occurs, and preventing waste chips from entering the inside of the protective cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention and its features, configurations and advantages will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings, in which like reference numerals indicate like parts throughout the drawings, which are not drawn to scale, with emphasis placed on illustrating the subject matter of the present invention.

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of an adjustable turntable for machine tool processing provided by the present invention.

[0022] Figure 2 It is a schematic diagram of the three-dimensional structure inside the protective cover.

[0023] Figure 3 It is a schematic diagram of the state structure when two gears are engaged.

[0024] Figure 4 It is a three-dimensional structural diagram of the worm gear set.

[0025] Figure 5 It is a schematic diagram of the partially disassembled structure of the worm gear assembly.

[0026] Figure 6 It is a schematic diagram of the three-dimensional structure of the worm gear base.

[0027] Figure 7 It is a schematic diagram of the three-dimensional structure of a half tooth.

[0028] Figure 8 It is a three-dimensional structural diagram of the driving mechanism.

[0029] Figure 9 It is a schematic diagram of the three-dimensional structure inside the groove.

[0030] Figure 10 It is a three-dimensional structural diagram of the cleaning mechanism.

[0031] Figure 11 It is a schematic diagram of the state changes of the cleaning mechanism during cleaning.

[0032] In the figure: 1. Protective cover; 2. Worm 1; 3. Worm 2; 4. Worm gear assembly; 5. Synchronous worm gear; 6. Turntable; 7. Ball bearing; 8. Circular shaft; 9. Guide rod; 10. Moving plate; 11. Arc groove; 12. Gear 1; 13. Semi-threaded rod; 14. Positioning plate; 15. Gear 2; 16. Arc base plate; 17. Groove; 18. Connecting spring; 19. Tooth block; 20. Worm gear base; 21. Semi-tooth; 22. Circular groove; 23. Externally threaded pipe; 24. Anti-slip ring; 25. Fixed plate; 26. Annular groove; 27. Movable shaft; 28. Mounting tube; 29. ​​Slider; 30. Guide groove; 31. Long groove; 32. Electric push rod; 33. Threaded rod; 34. Connecting rod; 35. Cleaning rod; 36. Arc rod. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Figure 1 Disclosed is an adjustable turntable 6 for machine tool processing, which is mainly used in worm gear drive usage scenarios. The surface of the turntable 6 is usually equipped with a clamping device to clamp and limit the workpiece to be processed. The clamping device is not shown in the figure. The turntable 6 can be embedded or raised on the surface of the machine tool. In this embodiment, the turntable 6 is raised on the surface of the machine tool. Four embodiments are set to ensure the processing accuracy of the workpiece on the turntable 6.

[0036] Example 1

[0037] like Figure 1 and Figure 2 As shown, the mechanism for driving the turntable 6 to rotate is assembled inside the protective cover 1. The protective cover 1 includes a frame body with sealed sides and bottom and a sealing cover covering the unsealed position. The sealing cover is set to be detachable and has a through groove on the surface of the sealing cover. Figure 10 An integrally formed mounting tube 28 is provided in the middle of the turntable 6 . The mounting tube 28 passes through the through slot and is placed inside the protective cover 1 . The mechanism that drives the turntable 6 to rotate directly drives the mounting tube 28 to rotate.

[0038] like Figure 2 and Figure 3 As shown, a rotatable circular shaft 8 is installed inside the protective cover 1. The circular shaft 8 is driven by various external driving methods, including but not limited to electric, hydraulic and pneumatic. A coaxially rotating worm 2 and worm 2 3 are fixedly assembled on the surface of the circular shaft 8. A worm gear set 4 and a synchronous worm gear 5 are also assembled inside the protective cover 1. A movable shaft 27 and a rotating shaft are fixed inside the worm gear set 4 and the synchronous worm gear 5 respectively. The movable shaft 27 and the rotating shaft are both assembled inside the protective cover 1 through bearings, which are not shown in the figure. The worm gear set 4 and the worm 2 are meshed, and the synchronous worm gear 5 and the worm 2 are meshed. It should be noted that the lead angle of the worm 2 is smaller than the equivalent friction angle between the meshing surfaces of the worm 2 and the worm gear set 4, and the lead angle of the worm 2 is smaller than the friction equivalent between the meshing surfaces of the worm 2 3 and the synchronous worm gear 5. In order to meet the self-locking conditions, the protective cover 1 is equipped with a linkage mechanism for sharing the load of the worm 2.

[0039] The linkage mechanism includes two gears 12 fixedly sleeved on the movable shaft 27 and the rotating shaft respectively. To ensure that the two gears 12 can mesh, the spiral directions of the worm 12 and the worm 2 3 are opposite, and the rotation directions of the worm gear set 4 and the synchronous worm gear 5 are opposite. At this time, the two gears 12 can mesh directly. When the workpiece is placed on the surface of the turntable 6, the load of the worm gear 2 driving the worm gear set 4 will increase, and the friction generated by the rotation of the worm 2 and the worm gear set 4 will also increase, and the wear caused by the rotation of the worm gear set 4 will accelerate. However, since the movable shaft 27 in the worm gear set 4 is transmitted to the rotating shaft of the synchronous worm gear 5 through the meshing of the two gears 12, part of the load of the worm gear set 4 can be effectively dispersed, thereby slowing down wear and reducing the impact of the lead jamming caused by excessive tooth clearance of the worm gear set 4 as much as possible, thereby extending the service life and reducing unnecessary cost losses. A plurality of long grooves 31 extending along the axial direction are provided on the surface of the movable shaft 27, see Figure 10 A plurality of protrusions are provided inside the mounting tube 28 , and the upper portion of the movable shaft 27 can be fully inserted into the interior of the mounting tube 28 .

[0040] A vibration sensor is installed inside the protective cover 1. The vibration sensor is a prior art and is not shown in the figure. When the worm 2 and the worm gear 4 are worn out, the equipment will vibrate. The vibration sensor detects the vibration signal and transmits the signal to the controller. The controller receives and processes the signal to determine whether the vibration signal is within a reasonable threshold. If the vibration signal is outside the threshold, the controller can control the external drive that drives the circular shaft 8 to stop working, so as to avoid economic losses caused by jamming or emergency stop of the equipment during operation.

[0041] Example 2

[0042] like Figure 2 、 Figure 8 and Figure 9 As shown, due to the inevitable wear between the worm 2 and the worm gear 4, in order to ensure that the worm gear 4 can quickly respond to rotation, a plurality of guide rods 9 are fixedly set on the surface of the circular shaft 8, and a through groove for the guide rod 9 to pass through is provided on the inner side of the worm 2, and the shape of the through groove is adapted to the shape of the guide rod 9. A certain distance is set between the worm 2 and the worm 2 3 for the worm 2 to move. The protective cover 1 is internally assembled with a driving mechanism so that the worm 2 can move along its axial direction to compensate for the wear caused by rotation.

[0043] In this embodiment, the driving mechanism includes a movable plate 10 fixedly sleeved on the two end surfaces of the worm 2. When the worm 2 moves axially along the circular shaft 8, the movable plate 10 will also move with the worm 2. A positioning plate 14 is fixedly installed at the end of the worm 2 3. The surface of the positioning plate 14 is installed with a semi-threaded rod 13 through a bearing. The bearing is not shown in the figure. The semi-threaded rod 13 can rotate on the surface of the positioning plate 14, but will not move axially. The threaded part of the semi-threaded rod 13 is far more than the non-threaded part. The threaded part of the semi-threaded rod 13 threads through the surface of the movable plate 10. The non-threaded end of the semi-threaded rod 13 is fixedly sleeved with gear 2 15. A rack mechanism is installed inside the protective cover 1. The rack mechanism and gear 2 15 are in a state of mutual engagement. In the process of the semi-threaded rod 13 rotating with the circular shaft 8, gear 2 15 revolves around the axis of the circular shaft 8.

[0044] Taking the forward rotation of the circular shaft 8 as an example, when the gear 2 15 passes through the rack mechanism, the rack mechanism will cause the gear 2 15 to rotate, and the rotation will drive the movement of the movable plate 10, thereby indirectly driving the semi-threaded rod 13 to perform axial movement displacement compensation. The rack mechanism includes an arc-shaped base plate 16 assembled inside the protective cover 1. The arc of the arc-shaped base plate 16 is the path for the gear 2 15 to rotate around the axis of the worm 2. An arc-shaped array of grooves 17 is provided on the inner side of the arc-shaped base plate 16. The interior of the groove 17 is equipped with a connecting spring 18 and a tooth block 19. The tooth block 19 is fixed to one end of the connecting spring 18. Once the displacement compensation of the semi-threaded rod 13 is completed, that is, the worm 2 can no longer move axially, the gear 2 15 will squeeze the tooth block 19 until the tooth block 19 moves to the inside of the groove 17, so as to prevent the worm 2 from being suddenly stuck, thereby extending the service life and effectively reducing economic losses.

[0045] In order to prevent the rack mechanism from affecting the rotation of worm 1 2, it is necessary to move the rack mechanism away from gear 2 15 after the displacement compensation wear. At this time, a T-shaped slider 29 is fixedly installed on the side of the arc-shaped base plate 16, and a guide groove 30 is opened inside the protective cover 1. The shape of the guide groove 30 is adapted to the shape of the slider 29. The slider 29 is movably installed inside the guide groove 30 and can move along the path of the guide groove 30. An electric push rod 32 is fixedly installed inside the protective cover 1. When the compensation is completed, the electric push rod 32 drives the rack mechanism to move along the guide groove 30, and the rack mechanism will move away from gear 2 15.

[0046] Example 3

[0047] like Figure 4-Figure 7As shown, in order to reduce the wear between the worm gear set 4 and the worm 2, a ball 7 is set at the contact position between the worm gear set 4 and the worm 2. The ball 7 is in contact with the worm 2 to convert the sliding friction into rolling friction, thereby slowing down the wear between the worm 2 and the worm gear set 4 and reducing the influence of the clearance problem on the transmission effect of the worm gear set 4.

[0048] The worm gear set 4 includes a worm gear base 20. The difference from an ordinary worm gear is that the cross-section of each tooth of the worm gear base 20 is half of that of an ordinary worm gear tooth. A circular groove 22 is opened at the position of each tooth, and the ball 7 is placed inside the circular groove 22. A matching half tooth 21 is installed at the position of each tooth to form a complete full tooth. The same circular groove 22 is opened on the surface of the half tooth 21, and the ball 7 is placed inside the circular groove 22. The surface of the ball 7 is against the plane of the tooth. The ball 7 on the half tooth 21 is misaligned with the ball 7 on the worm gear base 20. It should be noted that the upper opening of the gap between adjacent teeth on the worm gear base 20 is slightly larger than the lower opening. Therefore, when installing the half tooth 21, the half tooth 21 can be pre-installed in the corresponding position by relying on friction. A fixing mechanism is provided on the surface of the worm gear base 20 to ensure stable installation of the half tooth 21.

[0049] The fixing mechanism includes an externally threaded tube 23 fixedly mounted on the top and bottom of the worm gear base 20, and an anti-slip ring 24 is threadedly sleeved on the surface of the externally threaded tube 23. The end of the anti-slip ring 24 abuts against the surface of the half-tooth 21 and the worm gear base 20. An arc-shaped fixing plate 25 is fixedly mounted on the top and bottom of the half-tooth 21. An annular groove 26 for accommodating the fixing plate 25 is provided on the surface of the anti-slip ring 24 to prevent the half-tooth 21 from falling off.

[0050] Since the ball 7 will wear out during long-term use, it is necessary to replace the ball 7 regularly. When replacing, rotate and remove the anti-slip ring 24, take out the half tooth 21, put the ball 7 into the corresponding circular groove 22, and then install the half tooth 21 to its original position. After all the balls 7 are installed, reinstall the anti-slip ring 24.

[0051] Example 4

[0052] like Figure 1 and Figure 10As shown, since there is a gap between the mounting tube 28 of the turntable 6 and the sealing cover, there may be a problem that waste chips enter the interior and affect the rotation during the workpiece processing. Therefore, a cleaning mechanism is assembled on the lower surface of the turntable 6 to clean the gap position through the cleaning mechanism. The cleaning mechanism includes a connecting rod 34 arranged along the radial direction of the turntable 6. In this embodiment, two connecting rods 34 are equidistantly arranged, and three cleaning rods 35 are fixedly installed on the surface of the connecting rod 34 at equal distances. The cleaning rod 35 and the connecting rod 34 are both movably embedded in the lower surface of the turntable 6. The two The connecting rod 34 is fixedly mounted by an arc-shaped rod 36. An arc-shaped groove 11 is provided on the surface of the mounting tube 28. The arc-shaped rod 36 is located inside the arc-shaped groove 11 and can only move up and down relative to the arc-shaped groove 11. A threaded rod 33 is also movably mounted inside the arc-shaped groove 11 via a bearing. The threaded rod 33 can rotate to adjust the height of the arc-shaped rod 36. The threaded rod 33 is threadedly connected to the two arc-shaped rods 36 at the same time. The upper end of the threaded rod 33 passes through the turntable 6 and is provided with a cross slot so that the threaded rod 33 can be rotated outside the turntable 62 by a tool. Figure 11 As shown, it should be noted that the projected ends of two adjacent cleaning rods 35 in the vertical diameter direction partially overlap, so that the internal waste chips can be cleaned out step by step when cleaning the waste chips.

[0053] In order to prevent the cleaning rod 35 from continuously contacting the surface of the protective cover 1 when the turntable 6 rotates, thereby affecting the rotation of the turntable 6 itself, when cleaning is not required, the cleaning rod 35 and the connecting rod 34 are both located inside the turntable 6. When cleaning is required, the threaded rod 33 is rotated to adjust the height of the curved rod 36 downward, driving the connecting rod 34 and the cleaning rod 35 to move downward. The cleaning rod 35 contacts the upper surface of the protective cover 1, and cleaning can be carried out in time, effectively reducing the risk of getting stuck. Automatic cleaning can be achieved during the rotation of the turntable 6, eliminating the need to manually disassemble the turntable 6 for cleaning, making cleaning convenient.

[0054] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0055] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "connected," "installed," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0056] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can make many possible changes and modifications without departing from the technical solution of the present invention, or modify them into equivalent embodiments with equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention that do not depart from the content of the technical solution of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. An adjustable turntable for machine tool processing, characterized in that: A protective cover is installed on a machine tool for protection, wherein a first worm and a second worm rotating coaxially are assembled inside the protective cover, a worm gear set meshing with the first worm and a synchronous worm gear meshing with the second worm are assembled inside the protective cover, and a linkage mechanism for sharing the load of the first worm and reducing friction loss is assembled inside the protective cover; One end of the worm is equipped with a driving mechanism for driving it to move axially to compensate for wear, and the top of the protective cover is equipped with a turntable that rotates coaxially with the worm gear set; The lower surface of the turntable is equipped with a cleaning mechanism for preventing waste chips from entering the rotating gap of the turntable, and the surface of the turntable is equipped with a threaded rod for lifting the cleaning mechanism against the surface of the protective cover for cleaning; The surface of the worm gear set that meshes with the worm is inlaid with a plurality of balls for reducing friction.

2. The adjustable turntable for machine tool processing according to claim 1, characterized in that: The interior of the protective cover is equipped with a rotatable circular shaft, the worm gear 2 is fixedly mounted on the surface of the circular shaft, the surface of the circular shaft is equipped with a strip-shaped guide rod for limiting, the worm gear 1 is movably sleeved on the surface of the circular shaft, and the inner side of the worm gear 1 is provided with a through groove for the guide rod to pass through, and the driving mechanism is assembled inside the protective cover.

3. The adjustable turntable for machine tool processing according to claim 2, characterized in that: The driving mechanism includes a movable plate fixedly sleeved on the surface of worm one and capable of moving with worm one, a positioning plate fixedly mounted on the surface of worm two, a semi-threaded rod mounted on the surface of the positioning plate through a bearing, the threaded portion of the semi-threaded rod threadedly penetrates the surface of the movable plate, the non-threaded end of the semi-threaded rod is fixedly sleeved with gear two, and the interior of the protective cover is equipped with a rack mechanism that meshes with gear two and prevents gear two from excessive rotation and compensates for excessive wear.

4. The adjustable turntable for machine tool processing according to claim 1, characterized in that: The linkage mechanism includes two mutually meshing gears 1, and the two gears 1 are coaxially installed with the worm gear set and the synchronous worm gear respectively.

5. The adjustable turntable for machine tool processing according to claim 3, characterized in that: A T-shaped slider is fixedly installed on the side of the rack mechanism, and a guide groove adapted to the shape of the slider is opened inside the protective cover. The slider is movably inserted into the guide groove and moves. An electric push rod is installed inside the protective cover to drive the rack mechanism away from gear two.

6. The adjustable turntable for machine tool processing according to claim 5, characterized in that: The rack mechanism includes an arc-shaped base plate assembled inside the protective cover, an arc-shaped array of grooves is opened on the inner side of the arc-shaped base plate, a connecting spring and a tooth block are assembled inside the groove, and the tooth block is fixed to one end of the connecting spring.

7. The adjustable turntable for machine tool processing according to claim 1, characterized in that: The worm gear assembly includes a worm gear base in which each tooth is half, and the surface of the worm gear base is equipped with multiple half teeth to form a worm gear. The opposite sides of the worm gear base and the half teeth are provided with circular grooves with arc-shaped ends. The ball is assembled inside the circular groove, and the surface of the ball is against the contact surface of the half teeth and the worm gear base. The surface of the worm gear base is equipped with a fixing mechanism for clamping and fixing.

8. The adjustable turntable for machine tool processing according to claim 7, characterized in that: The fixing mechanism includes external threaded tubes mounted on the top and bottom of the worm gear base, the surface of the external threaded tubes is threadedly sleeved with anti-slip rings that rest against the half teeth and the surface of the worm gear base, the ends of the half teeth are equipped with arc-shaped fixing plates, and the surface of the anti-slip rings is provided with an annular groove for placing the fixing plate.

9. The adjustable turntable for machine tool processing according to claim 1, characterized in that: The gear 1 and the worm gear set are installed through a movable shaft. A long groove along the axial direction is opened on the surface of the movable shaft. The middle part of the turntable is provided with a mounting tube with a protrusion inside that is clamped on the movable shaft.

10. The adjustable turntable for machine tool processing according to claim 1, characterized in that: The cleaning mechanism includes a connecting rod arranged along the radial direction of the turntable, and a plurality of inclined cleaning rods are installed at equal intervals on the surface of the connecting rod. The end portions of the projections of adjacent cleaning rods in the vertical diameter direction overlap. The two cleaning rods are installed and connected by a semicircular arc rod, and the threaded rod threads through the arc rod. Two arc grooves are provided on the surface of the turntable, and the arc rod and the threaded rod are both placed inside the arc grooves.

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