CN207642310U - A kind of servo-drive automatic tool changer main shaft - Google Patents

Abstract

The utility model discloses a servo-driven automatic tool-changing main shaft, which comprises: a rotating shaft, a housing for fixing the rotating shaft, a fixing assembly for fixing the rotating shaft and the housing, serial bearing groups installed at both ends of the housing, and connecting The transmission box in the machine casing, the servo mechanism that drives the main shaft through the transmission box, and the pneumatic tool changer that is connected to the rotary shaft and can realize automatic tool change; the pneumatic tool changer consists of: a push rod installed in the rotary shaft, A pressure sleeve fixed on the push rod, a spring member arranged between the rotating shaft and the push rod, and a cylinder assembly for driving the push rod to move. The utility model provides a servo-driven automatic tool change spindle, which has the advantages of stable torque output, convenient and reliable interface connection form, high-precision rotation capability and convenient operation.

Description

A servo-driven automatic tool change spindle

technical field

The utility model belongs to the technical field of electromechanical engineering, in particular to a main shaft.

Background technique

The main shaft refers to the shaft that receives power from the engine or electric motor and transmits it to other parts. In the current domestic horizontal engraving and milling industry, as the main component of driving rotation and positioning, the main shaft needs stable torque output, high rotation accuracy, and convenient and reliable interface connection form to meet the needs of the market. The existing technology has not yet solve such problems.

Utility model content

In order to solve the deficiencies of the prior art, the purpose of this utility model is to provide a servo-driven automatic tool change spindle, which has the advantages of stable torque output, convenient and reliable interface connection form, high-precision rotation capability, and convenient operation.

In order to achieve the above object, the utility model adopts the following technical solutions:

A servo-driven automatic tool changer spindle, comprising: a rotating shaft, a casing for fixing the rotating shaft, a fixing assembly for fixing the rotating shaft and the casing, series bearing groups installed at both ends of the casing, and a casing connected to the casing The transmission box, the servo mechanism that drives the main shaft through the transmission box, is connected to the rotating shaft and can realize the pneumatic tool changing device that can automatically change the tool; the pneumatic tool changing device consists of: a push rod installed in the rotating shaft, fixed on the push rod The pressure sleeve is a spring member located between the rotating shaft and the push rod, and the cylinder assembly that drives the push rod to move.

The aforementioned servo-driven automatic tool change spindle, the cylinder assembly consists of: a front cylinder block that drives the pressure sleeve to move, a front piston connected to the front cylinder block, a rear piston connected to the front piston, and a rear cylinder connected to the upper and rear pistons Body, fixed on the rear cover of the rear cylinder block, the cylinder air intake and return pipelines between the front cylinder block, the rear cylinder block and the rear cover, and the piston return spring inside the front cylinder block and the rear cylinder block.

The aforementioned servo-driven automatic tool changer spindle, the fixed assembly consists of: an end cover fixed between the casing and the series bearing group, a front gland fixed on the end cover, a sealing cover fixed on the rotating shaft, The elastic claw that is in contact with the main shaft and fixed on the rotating shaft by the spring is fixed on the limit retaining ring between the elastic claw and the rotating shaft.

The aforementioned servo-driven automatic tool change spindle has an air inlet port and an air return port on the rear cover; an air seal port is provided on the side of the transmission box.

In the aforementioned servo-driven automatic tool changer spindle, the air seal inlet communicates with the machine casing, end cover, front end gland, and dust cover to form a compressed air flow channel, and the compressed air flow channel generates slightly positive pressure air in the dust cover , the slightly positive pressure air flows out through the gap between the dust cover and the rotating shaft, forming a layer of air film around the shaft end of the main shaft.

For the aforementioned servo-driven automatic tool change spindle, the fixed component also includes: a taper sleeve fixed on the end cover, and a dust cover fixed on the sealing cover and the taper sleeve.

The above-mentioned servo-driven automatic tool change spindle, the tandem bearing group consists of: a front bearing arranged at one end of the rotating shaft and installed in series between the front end gland and the end cover, arranged at the other end of the rotating shaft and installed in series on the casing rear bearing inside the body.

In the aforementioned servo-driven automatic tool change spindle, a front spacer group is provided between the two paired bearings of the front bearing, and the front spacer group is composed of a front outer spacer and a front inner spacer; the two paired bearings of the rear bearing A rear spacer group is arranged between them, and the rear spacer group is composed of front and rear spacers and rear inner spacers.

The aforementioned servo-driven automatic tool change spindle, the servo mechanism consists of: a servo motor, a planetary reducer connected to the servo motor, and a servo controller connected to the servo motor.

In the aforementioned servo-driven automatic tool change spindle, the elastic jaws are eight-lobed elastic jaws.

The utility model is beneficial in that: the utility model provides a servo-driven automatic tool change spindle, the utility model spindle is controlled by a servo mechanism, the overall structure is compact, reliable, and easy to operate and control; the utility model is equipped with a high-precision encoder Closed-loop control can realize precise positioning at any position; the utility model adopts a series bearing assembly, which improves the precision of the spindle, effectively reduces the damage to the bearing when the tool change mechanism is working, and improves the service life of the electric spindle; the utility model has The pneumatic tool changing device is easy to operate and has high reliability; the spindle uses compressed air for non-contact air seal and labyrinth seal to obtain a better sealing effect.

Description of drawings

Fig. 1 is the structural representation of a kind of embodiment of the utility model;

Fig. 2 is a structural representation of an embodiment of the utility model back cover;

Fig. 3 is a schematic structural view of an embodiment of the utility model transfer box;

Meanings of reference signs in the figure:

1 Elastic claw, 2 Limit retaining ring, 3 Dust cover, 4 Seal cover, 5 Front gland, 6 Taper sleeve, 7 End cover, 8 Front spacer group, 9 Front bearing, 10 Machine housing, 11 Rotation Shaft, 12 Push rod, 13 Preloading device, 14 Rear bearing, 15 Rear spacer group, 16 Servo mechanism, 17 Rear cover, 18 Rear piston, 19 Rear cylinder block, 20 Front piston, 21 Front cylinder block, 22 Pressure sleeve , 23 transmission box, 231 synchronous wheel A, 232 synchronous wheel B, 233 synchronous belt, 234 synchronous belt tensioning mechanism, 24 lock nut, 25 disc spring, AI air inlet port, AO air return port, AS air seal inlet .

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is made concrete introduction.

A servo-driven automatic tool change spindle, comprising: a rotating shaft 11, a housing 10 for fixing the rotating shaft 11, a fixing assembly for fixing the rotating shaft 11 and the housing 10, and series bearing groups installed at both ends of the housing 10, The transmission box 23 connected to the machine housing 10, the servo mechanism 16 that drives the main shaft through the transmission box 23, and the pneumatic tool change device that is connected to the rotating shaft 11 and can realize automatic tool change; the pneumatic tool change device consists of: installed on the rotary The push rod 12 in the shaft 11, the pressure sleeve 22 fixed on the push rod 12, the spring member arranged between the rotating shaft 11 and the push rod 12, and the cylinder assembly for driving the push rod 12 to move. As a preference, the spring element is a disc spring 25 . The transmission box 23 is stably fixed by the locking nut 24 . A pretensioning device 13 is provided between the push rod 12 and the cylinder assembly.

The cylinder assembly consists of: a front cylinder block 21 that drives the pressure sleeve 22 to move, a front piston 20 connected to the front cylinder block 21, a rear piston 18 connected to the front piston 20, a rear cylinder block 19 connected to the upper rear piston 18, and a fixed The rear cover 17 of the rear cylinder block 19, the cylinder air intake and return pipelines between the front cylinder block 21, the rear cylinder block 19 and the rear cover 17, the pistons located inside the front cylinder block 21 and the rear cylinder block 19 return spring. As shown in FIG. 2 , when the cylinder is released, the compressed air enters through the air intake interface AI formed on the rear cover 17 , and the pressure is converted into thrust in the cylinder to push the piston forward. When the workpiece is clamped, the compressed air is reset from the return air interface AO formed on the rear cover 17, and the disc spring 25 is reset and generates tension to shrink and deform the elastic claw 1 to clamp the workpiece.

The fixed assembly consists of: the end cover 7 fixed between the machine casing 10 and the series bearing group, the front end gland 5 fixed on the end cover 7, the sealing cover 4 fixed on the rotating shaft 11, which contacts the main shaft and passes through The spring element is fixed on the elastic claw 1 on the rotating shaft 11 , and is fixed on the stop ring 2 between the elastic claw 1 and the rotating shaft 11 . As a preference, the elastic claw 1 is an elastic claw 1 with an eight-petal structure. The elastic claw 1 with an eight-petal structure has good elasticity, stiffness, and fatigue resistance. 25 is fixed on the rotating shaft 11. In order to increase the airtightness and dustproofness, the fixing assembly is further composed of: a taper sleeve 6 fixed on the end cover 7 , and a dust cover 3 fixed on the sealing cover 4 and the taper sleeve 6 .

The rear cover 17 is provided with an air inlet interface AI and an air return interface AO, and the side of the transmission case 23 is provided with an air seal inlet AS. The air seal inlet AS communicates with the casing 10, the end cover 7, the front end gland 5, and the dust cover 3 to form a compressed air flow channel, and the compressed air flow channel generates slightly positive pressure air in the dust cover 3, and the slightly positive pressure air Flow out through the gap between the dust cover 3 and the rotating shaft 11, forming a layer of air film around the shaft end of the main shaft. Due to the combination of non-contact air seal and labyrinth seal, it prevents external moisture and impurities from entering the main shaft and achieves the effect of non-contact seal.

The tandem bearing group consists of: a front bearing 9 arranged at one end of the rotating shaft 11 and installed in series between the front end gland 5 and the end cover 7, and a rear bearing arranged at the other end of the rotating shaft 11 and installed in series inside the casing 10 14. Between the two paired bearings of the front bearing 9, a front spacer group 8 is provided, and the front spacer group 8 is composed of a front outer spacer and a front inner spacer; a rear spacer is arranged between the two paired bearings of the rear bearing 14 Group 15, rear spacer group 15 is made up of front and rear spacers and rear inner spacers. This design greatly improves the static and dynamic stiffness of the spindle, and at the same time, the traditional DB combination has changed to the current DT combination, and the axial cutting force of the bearing has also been doubled.

The servo mechanism 16 consists of: a servo motor, a planetary reducer connected to the servo motor, and a servo controller connected to the servo motor.

Transmission box 23 is made up of: synchronous wheel A231, synchronous wheel B232, is connected to the synchronous belt 233 of synchronous wheel A231 and synchronous wheel B232 and transmits power, is connected to the synchronous belt tensioning mechanism 234 of synchronous belt 233.

The utility model provides a servo-driven automatic tool change spindle. The spindle of the utility model is controlled by a servo mechanism 16. The overall structure is compact, reliable, and easy to operate and control. The utility model is equipped with a high-precision encoder closed-loop control, which can realize any position. Accurate positioning; the utility model adopts series bearing components, which improves the precision of the spindle, effectively reduces the damage to the bearing when the tool change mechanism is working, and improves the service life of the electric spindle. The utility model optimizes the structure of the spindle, and the spindle The low-speed torque is large, and the speed of 0-1000rpm works stably; the utility model is equipped with a pneumatic tool changer, which is easy to operate and use, and has high reliability, and is suitable for grinding and milling of various materials; the main shaft uses compressed air for non-contact The combination of type hermetic seal and labyrinth seal achieves a better sealing effect.

The basic principles, main features and advantages of the present utility model have been shown and described above. Those skilled in the industry should understand that the above-mentioned embodiments do not limit the utility model in any form, and all technical solutions obtained by means of equivalent replacement or equivalent transformation all fall within the protection scope of the utility model.

Claims (9)

1. A servo-driven automatic tool changer spindle, characterized in that it comprises: a rotating shaft, a casing for fixing the above-mentioned rotating shaft, a fixing assembly for fixing the above-mentioned rotating shaft and the casing, and a series connection installed at both ends of the above-mentioned casing The bearing group is connected to the transmission box of the above-mentioned machine casing, the servo mechanism that drives the main shaft to run through the above-mentioned transmission box, and the pneumatic tool change device that is connected to the above-mentioned rotating shaft and can realize automatic tool change; the above-mentioned pneumatic tool change device is composed of: The push rod in the rotating shaft, the pressure sleeve fixed on the push rod, the spring member arranged between the rotating shaft and the push rod, and the cylinder assembly that drives the above push rod to move; the above air cylinder assembly is composed of: driving the above pressure sleeve to move The front cylinder block is connected to the front piston of the above-mentioned front cylinder block, the rear piston is connected to the above-mentioned front piston, the rear cylinder block is connected to the upper rear piston, the rear cover is fixed to the above-mentioned rear cylinder block, and is arranged on the above-mentioned front cylinder block 1. Cylinder intake and air return lines between the rear cylinder block and the rear cover, and the piston return springs inside the front cylinder block and the rear cylinder block. 2. A servo-driven automatic tool change spindle according to claim 1, characterized in that, the above-mentioned fixing assembly consists of: an end cover fixed between the above-mentioned machine housing and the series bearing group, and an end cover fixed on the end cover The front end gland, the sealing cover fixed on the above-mentioned rotating shaft, the elastic claw that contacts the main shaft and is fixed on the rotating shaft through a spring member, and the limit retaining ring fixed between the above-mentioned elastic claw and the rotating shaft. 3 . The servo-driven automatic tool change spindle according to claim 1 , wherein an air inlet port and an air return port are provided on the rear cover, and an air seal inlet is provided on the side of the transmission box. 4 . 4. A servo-driven automatic tool changer spindle according to claim 3, characterized in that the air seal inlet communicates with the machine casing, end cover, front end gland, and dust cover to form a compressed air channel, and the compressed air The air channel generates slightly positive pressure air in the dust cover, and the above-mentioned slightly positive pressure air flows out through the gap between the dust cover and the rotating shaft, forming a layer of air film around the shaft end of the main shaft. 5. A servo-driven automatic tool change spindle according to claim 2, characterized in that, the above-mentioned fixing assembly is further composed of: a taper sleeve fixed on the above-mentioned end cover, an anti-tap cover fixed on the above-mentioned sealing cover and the taper sleeve Dust cover. 6. A servo-driven automatic tool-changing spindle according to claim 2, characterized in that the above-mentioned series bearing group consists of: a front bearing arranged at one end of the above-mentioned rotating shaft and installed in series between the front gland and the end cover , is located at the other end of the above-mentioned rotating shaft and is installed in series in the rear bearing inside the casing. 7. A servo-driven automatic tool change spindle according to claim 6, characterized in that a front spacer group is provided between the two paired bearings of the front bearing, and the front spacer group consists of a front outer spacer and a front The inner spacer is composed of a rear spacer group between the two paired bearings of the rear bearing, and the rear spacer group is composed of the front and rear spacers and the rear inner spacer. 8. A servo-driven automatic tool change spindle according to claim 1, wherein the above-mentioned servo mechanism consists of: a servo motor, a planetary reducer connected to the above-mentioned servo motor, and a servo controller connected to the above-mentioned servo motor . 9 . The servo-driven automatic tool changer spindle according to claim 2 , wherein the above-mentioned elastic claw is an elastic claw with an eight-lobe structure. 10 .