A double-row ball-worm gear CNC rotary table with built-in rotary pull cylinder

Abstract

The present invention discloses a double-row ball-worm gear CNC rotary table with a built-in rotary pull cylinder, comprising a turntable base component, a servo motor, an arc envelope worm component, a double-row ball-worm gear component, a rotary pull cylinder component and a worktable. The servo motor is mounted on the turntable base component, the double-row ball-worm gear component is mounted inside the turntable base component, the double-row ball-worm gear component and the turntable base component are supported by a full-ball main bearing, the rotary pull cylinder component is mounted inside the double-row ball-worm gear component, the rotary pull cylinder component uses a spring force to tighten the piston to drive the clamp to work, an air inlet is provided on one side of the turntable base, the piston movement is controlled by an air source, thereby realizing the control of the tensioning force of the machine tool clamp, and the worktable is mounted on the output end of the double-row ball-worm gear component. Compared with the prior art, the present invention has a compact structure, high rigidity, high precision, and is easy to install and use.

Description

Technical Field

[0001] The invention relates to the field of numerically controlled machine tools, in particular to a double-row ball-worm gear numerically controlled rotary table with a built-in rotary cylinder. Background Art

[0002] The CNC rotary table is an important functional component of the CNC machine tool. It is driven by a servo motor to realize rotation position control. It can realize automatic clamping of the processed parts with the fixture. It is particularly suitable for CNC milling machines, CNC gear machine tools and CNC grinders. The rotating parts of the current rotary table are composed of various structural types such as traditional worm gears, roller bearing worm gears and electric direct drives, which have the problems of low efficiency and large wear or high efficiency and poor rigidity. The present invention adopts double-row ball bearings as the worm gear tooth surface and the arc surface enveloping worm to mesh and rotate, which can meet high efficiency and maintain high rigidity. The current rotary table can only provide a single rotation operation, and the clamping of the workpiece requires additional fixture components to realize automatic clamping. The present invention adopts the unique structure of the spherical worm gear component and designs a rotatable cylinder inside it to realize automatic clamping. The structure is compact, effectively saving the design space of the machine tool and simplifying the structure of the machine tool. The current rotary cylinder uses a two-way pneumatic push-pull piston to drive the clamp. In actual operation, when the air source pressure changes unexpectedly, it will affect the clamping force of the clamp, leading to production safety problems. The present invention uses a one-way cylinder and combines it with a spring assembly to achieve the locking and release of the clamp. The clamp is locked by the spring force, and the clamp is released by the cylinder force. In this way, even if the air source changes during the processing, the clamping force will not be lost, making the processing safety more reliable. Summary of the invention

[0003] The main purpose of the present invention is to provide a double-row ball-worm gear CNC rotary table with a built-in rotary cylinder to address the deficiencies in the prior art, comprising a rotary table base component, a servo motor, an arc envelope worm component, a double-row ball-worm gear component, a rotary cylinder component and a worktable. The servo motor is mounted on the rotary table base component, the double-row ball-worm gear component is mounted inside the rotary table base component, a key transmission is adopted between the servo motor and the double-row ball-worm gear component, the double-row ball-worm gear component and the rotary table base component are supported by a full-ball main bearing, the rotary cylinder component is mounted inside the double-row ball-worm gear component, the rotary cylinder component uses a spring force to tighten the piston to drive the clamp to clamp the workpiece, an air inlet is provided on one side of the rotary table base, and the piston movement is controlled by an air source to realize the control of the release of the machine tool clamp, and the worktable is mounted on the output end of the double-row ball-worm gear component.

[0004] As a preferred embodiment of the above scheme, the servo motor is connected to the arc-enveloping worm through a flat key, and a tapered roller bearing and a deep groove ball bearing are respectively provided on both sides of the arc-enveloping worm, a bearing cover is provided on the outer side of the bearing, an adjustment spacer is provided between one of the covers and the deep groove ball shaft, a rotating skeleton oil seal is provided inside the bearing cover, and an O-ring is provided on the outer side.

[0005] As a preferred embodiment of the above scheme, the double-row ball worm gear component is driven by an arc surface enveloping worm and a double-row ball worm gear. The outer circle of the double-row ball worm gear is provided with two rows of spherical pits. The number of the spherical pits is determined according to the reducer ratio required by the design. A circular ring magnet is installed in each spherical pit with a screw. A steel ball is provided in each pit and is attracted by the magnetism of the magnet. The steel ball can rotate in the spherical pit. The center line of the arc surface enveloping worm is located in the middle of the two rows of steel balls, so that the arc surface enveloping worm contacts more steel balls at the same time, and the load-bearing capacity is increased.

[0006] As a preferred embodiment of the above scheme, one end of the double-row ball worm gear is provided with a deep groove ball raceway, which is filled with steel balls and sleeved in the outer ring of the main bearing. A rotating skeleton oil seal is provided on the inner side of the outer ring of the main bearing to seal the double-row ball worm gear. An O-ring is provided on the outer side of the outer ring of the main bearing to seal the turntable base. A semicircular notch is provided on the ball raceway of the outer ring of the main bearing. A semicircular notch is also provided on the deep groove ball raceway of the double-row ball worm gear. When the two notches are opposite, the steel balls are installed from here. The other end of the double-row ball worm gear is connected to the rotating cylinder seat. A deep groove ball bearing is installed on the outer side of the rotating cylinder seat and sleeved in the turntable base.

[0007] As a preferred embodiment of the above scheme, a piston pull rod is provided inside the double-row ball worm gear and the rotating cylinder seat, and several pins are installed on the disk of the piston pull rod. A spring is sleeved on each pin, and one end of the spring is installed in the spring sleeve and placed in the countersunk hole on the inner side of the double-row ball worm gear to slide. A stop screw is provided in the middle of the countersunk hole on the inner side of the double-row ball worm gear, and the size of the spring force can be adjusted by adjusting the stop screw.

[0008] As a preferred embodiment of the above scheme, a plurality of oblique air holes are provided on one side of the root of the piston pull rod and can lead to the hole in the center of the piston pull rod. It is connected to the outside through the filter in the center of the air intake seat, which can eliminate the air seal of the spring-equipped end of the cylinder piston pull rod. The other end of the pin shaft is inserted into the pin sleeve on the rotating cylinder seat, so that the internal thread connection clamp of the piston pull rod can overcome the rotational torque when the clamp is locked. The double-row ball worm gear and the rotating cylinder seat are respectively provided with upper and lower guide sealing sleeves, and the two ends of the piston pull rod slide in the upper and lower guide sealing sleeves.

[0009] As a preferred embodiment of the above scheme, an air inlet seat is provided at the bottom of the turntable base, and an air duct is provided on the air inlet seat. One end of the air duct is connected to the air inlet of the turntable base, and the other end of the air duct is connected to the air duct on the rotating cylinder seat under the sealing of two skeleton rotating oil seals. The air duct on the rotating cylinder seat leads to one side of the piston, so that the air source can push the piston pull rod to move when the double-row ball worm gear is stopped or rotating.

[0010] The beneficial effects of the present invention are as follows: the servo motor can accurately control the rotation position of the workbench, and the center line of the arc envelope worm is located in the middle of the two rows of steel balls, so that the arc envelope worm contacts more steel balls at the same time, and the load-bearing capacity of the workbench is greatly improved. A deep groove ball bearing is installed on the outer side of the rotating cylinder seat and is sleeved in the turntable base, which improves the anti-overturning ability of the rotary table. During the rotation operation of the workbench, the rotating cylinder component always maintains the tensioning effect on the clamp, and the clamping force is controlled by the spring and will not be affected by the change of the air source, thereby improving the safety and reliability of the workpiece processing process. Therefore, the present invention has the advantages of compact structure, high positioning accuracy, high rigidity, and good safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] For ease of explanation, the present invention is described in detail with reference to the following specific implementations and accompanying drawings.

[0012] Figure 1 The overall appearance structure diagram of the present invention

[0013] Figure 2 The exploded schematic diagram of the overall structure of the present invention is

[0014] Figure 3 A cross-sectional view of the worm gear component of the present invention

[0015] Figure 4 Schematic diagram of the worm gear structure of the present invention

[0016] Figure 5 This is a transverse cross-sectional view of the overall structure of the present invention

[0017] Figure 6 A longitudinal cross-sectional view of the overall structure of the present invention

[0018] Explanation of symbols in the figure

[0019] 1-Turntable base component; 2-Servo motor; 3-Arc envelope worm component; 4-Double row ball worm component; 5, Rotary cylinder component; 6-Workbench; 101-Turntable base; 102-Intake seat; 103-Filter; 104-Assembly oil cap; 105-Oil mark; 106-O-type sealing ring A; 107-O-type sealing ring B; 201-Flat key; 301-Arc envelope worm; 302-Tapered roller bearing; 303-deep groove ball bearing A; 304-spacer; 305-bearing pressure cover; 306-rotating skeleton oil seal A; 307-O-type sealing ring C; 401-double-row ball worm gear; 402-full ball main bearing; 403-main bearing outer ring; 404-adjusting gasket; 405-rotating cylinder seat; 406-deep groove ball bearing B; 407-oil seal pressure cover; 408-steel ball; 409-rotating skeleton oil seal B; 410-O-type seal Ring D; 411-dustproof seal ring; 412-upper guide seal sleeve; 413-lower guide seal sleeve; 414-O-type seal ring E; 415-O-type seal ring F; 416-O-type seal ring G; 417-O-type seal ring H; 418-rotating skeleton oil seal C; 419-O-type seal ring J; 420-O-type seal ring K; 421-circular ring magnet; 422-screw; 423-plug screw; 501-piston pull Rod; 502-pin shaft; 503-spring; 504-spring sleeve, 505-adjusting screw, 506-pin sleeve; 507-O-ring N; 1001-air inlet; 1021-air duct of air inlet seat; 4011-gap of worm gear bearing; 4012-installation hole of steel ball; 4013-ball raceway; 4031-gap of outer ring of main bearing; 4051-air duct of cylinder seat; 5011-piston air duct; 5012-internal thread. DETAILED DESCRIPTION

[0020] like Figure 1 and Figure 3 As shown, this specific embodiment adopts the following technical scheme: it includes a turntable base component 1, a servo motor 2, an arc envelope worm component 3, a double-row ball worm component 4, a rotary cylinder component 5, and a workbench 6. The servo motor 2 is installed on the turntable base 101 to provide a power source. The servo motor 2 is connected to the arc envelope worm 301 through a flat key 201. Tapered roller bearings 302, deep groove ball bearings A303, spacers 304, bearing glands 305, and rotary skeleton oil seals A306 are respectively arranged between the two sides of the arc envelope worm 301 and the turntable base 101. The root of the outer cylindrical step of the bearing gland 305 is provided with an O-ring C307. The outer side surface of the turntable base 101 is provided with an assembly oiling cap 104 and an O-ring A106, and the other side surface is provided with an oil mark 105. One end of the double-row ball worm component 4 is connected to the workbench 6, and a rotary cylinder component 5 is arranged inside it.

[0021] like Figure 4 and Figure 6 As shown, a steel ball mounting hole 4012 is provided on the outer circle of the double-row ball worm gear 101 , and the annular magnet 421 is locked in the steel ball mounting hole 4012 by a screw 422 , and the steel ball 408 is adsorbed in the ball pit of the steel ball mounting hole 4012 by the annular magnet 421 .

[0022] like Figure 2 , Figure 4 and Figure 5 As shown, a ball raceway 4013 is provided on the outer circle of the double-row ball worm gear 401, and a full-ball main bearing 402 is provided between the ball raceway 4013 and the main bearing outer ring 403. When the worm gear bearing notch 4011 and the main bearing outer ring notch 4031 are facing each other, the full-ball main bearing 402 is installed from here, and a rotating skeleton oil seal B409 and an O-ring D410 are provided on the main bearing outer ring 403. A rotating cylinder seat 405 is provided at one end of the double-row ball worm gear 401, which is supported in the turntable base 101 through a deep groove ball bearing B406.

[0023] An adjusting gasket 404 is provided between the main bearing outer ring 403 and the turntable base 101. By changing the thickness of the adjusting gasket 404, the arc surface enveloping worm 301 can be positioned in the middle of the two rows of steel balls 408 on the double-row ball worm wheel 401 to obtain the best meshing effect.

[0024] The inner hole of the double-row ball worm gear 401 is provided with an upper guide seal sleeve 412 and a dustproof seal ring 411 to guide and seal the piston pull rod 501 against dust. The upper guide seal sleeve 412 is provided with an O-ring E414 and an O-ring F415. The inner hole of the rotating cylinder seat 405 is provided with a lower guide seal sleeve 413. The lower guide seal sleeve 413 is provided with an O-ring G416 and an O-ring H417. The outer circle of the rotating cylinder seat 405 is provided with an O-ring J419 to seal the double-row ball worm gear 401.

[0025] like Figure 5 and Figure 6 As shown, a piston rod 501 is provided between the double-row ball worm gear 401 and the rotating cylinder seat 405, and a plurality of pins 502 are provided on the piston rod 501, and a spring 503 and a spring sleeve 504 are sleeved on the pin 502. The spring sleeve 504 slides in the step hole of the double-row ball worm gear 401, and an adjusting screw 505 is provided in the center of the step hole to adjust the spring force, and the spring force always pushes the piston rod 501 to one end. A piston airway 5011 is provided on the piston rod 501, which leads to a blind hole in the middle of the piston and then communicates with the outside through the filtered air 103 in the middle of the air intake seat 102, so that the piston cavity at the spring will not be blocked.

[0026] The other end of the pin shaft 502 slides in the pin sleeve 506 set on the rotating cylinder seat 405, so that the piston pull rod 501 will not rotate relative to the double-row ball worm gear 401. One end of the piston pull rod 501 is provided with an internal thread 5012 connecting fixture, and the outer diameter of the piston pull rod 501 is provided with an O-ring N507.

[0027] An air inlet 1001 is provided on one side of the turntable base 301 and connected to the air inlet seat airway 1021 in the air inlet seat 102, and an O-ring M508 is provided between the two to seal the airway. A plug screw 423 is provided on the air inlet seat 102 to turn the airway. An oil seal gland 407 is provided on the rotating cylinder seat 405, and a rotating skeleton oil seal C418 and an O-ring J419 are provided on the oil seal gland 407. The inner hole of the rotating cylinder seat 405 is also provided with a chamber formed by two rotating skeleton oil seals C418. The rotating cylinder seat 405 is provided with a cylinder seat airway 4051 leading to one side of the piston rod 501. When the piston rod 501 rotates with the angle of the double-row ball worm gear 401, it can still ventilate with the air inlet 1001.

[0028] It should be emphasized that the above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A double-row ball-worm gear CNC rotary table with a built-in rotary pull cylinder, comprising a rotary table base component, a servo motor, an arc envelope worm component, a double-row ball-worm gear component, a rotary pull cylinder component and a worktable, wherein the servo motor is mounted on the rotary table base component, the double-row ball-worm gear component is mounted inside the rotary table base component, a key transmission is adopted between the servo motor and the double-row ball-worm gear component, the double-row ball-worm gear component and the rotary table base component are supported by a full-ball main bearing, the rotary pull cylinder component is mounted inside the double-row ball-worm gear component, the rotary pull cylinder component uses a spring force to tighten the piston to drive the clamp to clamp the workpiece, an air inlet is provided on one side of the rotary table base, and the piston movement is controlled by the air source to realize the control of the release of the machine tool clamp, the worktable is mounted on the output end of the double-row ball-worm gear component, the rotary pull cylinder component always keeps the tightening effect on the clamp during the rotating operation of the worktable, the clamping force is controlled by the spring and will not be affected by the change of the air source, and it is safe and reliable; The double-row ball worm gear component is driven by an arc-surface enveloping worm. The outer circle of the double-row ball worm gear is provided with two rows of spherical pits. The number of the spherical pits is determined according to the reducer ratio required by the design. A circular ring magnet is installed in each spherical pit with a screw. A steel ball is provided in each pit and is attracted by the magnetism of the magnet. The steel ball can rotate in the spherical pit. The center line of the arc-surface enveloping worm is located in the middle of the two rows of steel balls, so that the arc-surface enveloping worm contacts more steel balls at the same time, and the load-bearing capacity is increased.

2. The double-row ball-worm gear CNC rotary table with built-in rotary cylinder according to claim 1, characterized in that: The servo motor is connected to the arc-enveloping worm through a flat key. A tapered roller bearing and a deep groove ball bearing are respectively provided on both sides of the arc-enveloping worm. A bearing gland is provided on the outer side of the bearing. An adjustment spacer is provided between one of the glands and the deep groove ball shaft. A rotating skeleton oil seal is provided in the bearing gland and an O-ring is provided on the outer side.

3. The double-row ball-worm gear CNC rotary table with built-in rotary cylinder according to claim 1, characterized in that: One end of the double-row ball worm gear is provided with a deep groove ball raceway, which is filled with steel balls and sleeved in the outer ring of the main bearing. A rotating skeleton oil seal is provided on the inner side of the outer ring of the main bearing to seal the double-row ball worm gear. An O-ring is provided on the outer side of the outer ring of the main bearing to seal the turntable base. A semicircular notch is provided on the ball raceway of the outer ring of the main bearing, and a semicircular notch is also provided on the deep groove ball raceway of the double-row ball worm gear. When the two notches are opposite, the steel balls are installed from here. The other end of the double-row ball worm gear is connected to the rotating cylinder seat. A deep groove ball bearing is installed on the outer side of the rotating cylinder seat and sleeved in the turntable base, thereby improving the anti-overturning ability of the rotary table.

4. The double-row ball-worm gear CNC rotary table with built-in rotary cylinder according to claim 3, characterized in that: A piston pull rod is provided inside the double-row ball worm gear and the rotating cylinder seat, and several pins are installed on the disk of the piston pull rod. A spring is sleeved on each pin. One end of the spring is installed in the spring sleeve and is placed in the countersunk hole on the inner side of the double-row ball worm gear to slide. A stop screw is provided in the middle of the countersunk hole on the inner side of the double-row ball worm gear. The size of the spring force can be adjusted by adjusting the stop screw.

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