Four-axis numerical control rotary table

Abstract

The utility model relates to the field of numerical control rotary tables, in particular to a four-axis numerical control rotary table which comprises a machine base, a driving motor arranged in the machine base, a driving shaft arranged at the power output end of the driving motor, an index plate rotationally arranged on the machine base and an index plate locking mechanism used for locking the index plate on the driving shaft. The index plate locking mechanism comprises a locking shaft sleeve base fixedly arranged on the index plate, a hydraulic locking shaft sleeve arranged in an inner cavity of the locking shaft sleeve base and a driving shaft sleeve arranged in an inner cavity of the hydraulic locking shaft sleeve, and the index plate is connected to the machine base through the locking mechanism. Locking can be controlled by adjusting the oil pressure of pressure oil in the pressure oil cavity, locking failure caused by shaking generated during rotation is avoided, the locking effect is good, different hydraulic locking shaft sleeves can be replaced at any time for maintenance, and the service life is long.

Description

Technical Field:

[0001] The utility model relates to the technical field of numerical control turntables, in particular to a four-axis numerical control turntable. Background Art:

[0002] A numerical control machining center is a highly efficient automated machine tool composed of mechanical equipment and a numerical control system, suitable for machining complex parts. It is one of the numerically controlled turntables with the highest output and the widest application in the world at present. It has strong comprehensive processing capabilities. After the workpiece is clamped once, it can complete more processing contents, and the processing accuracy is relatively high. For batch workpieces with medium processing difficulty, its efficiency is 5 to 10 times that of ordinary equipment. In particular, it can complete many processes that ordinary equipment cannot complete, and is more suitable for single-piece processing or small and medium batch production of multi-variety with relatively complex shapes and high precision requirements. The dividing head is a turntable accessory that clamps the workpiece on the chuck and rotates, indexes, and positions it. The dividing head on the existing numerical control turntable needs to lock the rotating part and the drive shaft to enhance the stiffness during the operation of the dividing head. Most of the existing dividing heads are locked by screws. However, during the long-term operation of the dividing head, the vibration generated is likely to cause the screws to lose the pre-tightening force. Once the pre-tightening force is lost, it cannot be restored, resulting in the displacement of the dividing head and even final fatigue failure, which is not convenient for use. There is an urgent need for a four-axis numerical control turntable with stable locking and long service life. Summary of the Invention:

[0003] The purpose of the utility model is to provide a four-axis numerical control turntable with stable locking and long service life in view of the deficiencies of the existing technology.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is: a four-axis numerical control turntable, including a machine base, a drive motor arranged in the machine base, a drive shaft arranged at the power output end of the drive motor, a dividing head rotatably arranged on the machine base, and a dividing head locking mechanism for locking the dividing head on the drive shaft. The power output end of the drive motor is drivingly connected to the drive shaft, and the power output end of the drive shaft is drivingly connected to the dividing head; the dividing head locking mechanism includes a locking shaft sleeve base fixedly arranged on the dividing head, a hydraulic locking shaft sleeve arranged in the inner cavity of the locking shaft sleeve base, and a drive shaft sleeve arranged in the inner cavity of the hydraulic locking shaft sleeve. A pressure oil cavity is arranged in the hydraulic locking shaft sleeve. The drive shaft sleeve is provided with a plurality of chordal sections along the circumferential direction. There is a gap between the drive shaft sleeve and the hydraulic locking shaft sleeve. The drive shaft sleeve is sleeved on the drive shaft, and pressure oil is arranged in the pressure oil cavity.

[0005] For further improvement of the above solution, an oil inlet channel is arranged on the locking shaft sleeve base, and the oil inlet channel is communicated with the pressure oil cavity.

[0006] A further improvement to the above solution is that a rubber sealing ring is provided at the connection between the oil inlet passage and the pressure oil chamber.

[0007] A further improvement to the above solution is that key grooves are provided on both the drive shaft sleeve and the drive shaft. A flat key is provided in the key groove, and the drive shaft sleeve is sleeved on the drive shaft through the cooperation of the flat key and the key groove.

[0008] A further improvement to the above solution is that the flat key is a type A flat key.

[0009] A further improvement to the above solution is that it further includes a braking mechanism for braking the indexing plate. The braking mechanism includes an oil-containing cavity provided between the machine base and the indexing plate, a brake fixing ring provided in the oil-containing cavity, a brake expansion ring provided on the brake fixing ring near the drive motor, a sealing ring provided on the indexing plate near the drive motor, and an oil inlet provided on the brake fixing ring. The oil inlet is communicated with the oil-containing cavity, and the brake expansion ring pushes the brake fixing ring to reciprocate in the vertical direction.

[0010] A further improvement to the above solution is that an oil seal is provided between the brake fixing ring and the indexing plate.

[0011] A further improvement to the above solution is that a lifting ring is provided at the top of the machine base.

[0012] The beneficial effects of the present utility model are as follows: The present utility model includes a machine base, a drive motor provided in the machine base, a drive shaft provided at the power output end of the drive motor, an indexing plate rotatably provided on the machine base, and an indexing plate locking mechanism for locking the indexing plate to the drive shaft. The power output end of the drive motor is drivingly connected to the drive shaft, and the power output end of the drive shaft is drivingly connected to the indexing plate; the indexing plate locking mechanism includes a locking shaft sleeve base fixedly provided on the indexing plate, a hydraulic locking shaft sleeve provided in the inner cavity of the locking shaft sleeve base, and a drive shaft sleeve provided in the inner cavity of the hydraulic locking shaft sleeve. A pressure oil chamber is provided in the hydraulic locking shaft sleeve. The drive shaft sleeve is provided with a plurality of chordal sections in the circumferential direction. There is a gap between the drive shaft sleeve and the hydraulic locking shaft sleeve. The drive shaft sleeve is sleeved on the drive shaft, and pressure oil is provided in the pressure oil chamber.

[0013] The indexing plate of the utility model is connected to the machine base through an indexing plate locking mechanism. There is a pressure oil cavity in the hydraulic locking bushing, and pressure oil is arranged in the pressure oil cavity. Under the action of the pressure oil, the hydraulic locking bushing undergoes elastic deformation and presses downward on the driving bushing to generate a frictional locking torque. As the pressure increases, the deformation at the chordal tangent plane of the hydraulic locking bushing is greater than the elastic deformation at the cylindrical surface. This non-uniformity of deformation will produce a mechanical braking effect on the driving bushing at the chordal tangent plane. Compared with the traditional locking method, not only is the locking torque large, but also the locking can be controlled by adjusting the oil pressure of the pressure oil in the pressure oil cavity, and the locking will not fail due to the shaking generated during rotation. The locking effect is good, and different hydraulic locking bushings can be replaced at any time for maintenance, with a long service life. Brief Description of the Drawings:

[0014] Figure 1 It is a schematic structural diagram of the utility model.

[0015] Figure 2 It is a sectional view of the utility model.

[0016] Figure 3 For the utility model Figure 2 An enlarged view of part A.

[0017] Figure 4 It is a side view of the indexing plate locking mechanism of the utility model.

[0018] Figure 5 It is a schematic structural diagram of the driving bushing of the utility model.

[0019] Description of the reference numerals: Machine base 1, Driving motor 2, Driving shaft 3, Indexing plate 4, Indexing plate locking mechanism 5, Locking bushing base 51, Oil inlet channel 511, Hydraulic locking bushing 52, Pressure oil cavity 521, Driving bushing 53, Chordal tangent plane 531, Rubber sealing ring 54, Keyway 6, Flat key 61, Braking mechanism 7, Oil storage cavity 71, Braking fixing ring 72, Braking expansion ring 73, Sealing ring 74, Oil inlet 75, Oil seal 8, Lifting ring 9. Detailed Description of the Embodiment:

[0020] The following further describes the utility model with reference to the drawings, as Figures 1-5As shown, the utility model provides a four-axis CNC turntable, including a machine base 1, a driving motor 2 arranged in the machine base 1, a driving shaft 3 arranged at the power output end of the driving motor 2, a dividing plate 4 rotatably arranged on the machine base 1, and a dividing plate locking mechanism 5 for locking the dividing plate 4 to the driving shaft 3, the power output end of the driving motor 2 is driven to connect to the driving shaft 3, and the power output end of the driving shaft 3 is driven to connect to the dividing plate 4; the dividing plate locking mechanism 5 includes a locking sleeve base 51 fixedly arranged on the dividing plate 4, a hydraulic locking sleeve 52 arranged in the inner cavity of the locking sleeve base 51, and a driving sleeve 53 arranged in the inner cavity of the hydraulic locking sleeve 52, a pressure oil chamber 521 is arranged in the hydraulic locking sleeve 52, and the driving sleeve 53 is circumferentially provided with a plurality of chord sections 531, and a gap is provided between the driving sleeve 53 and the hydraulic locking sleeve 52. When not in use, the driving sleeve 53 and the hydraulic locking sleeve 52 have a gap, and when in use, the hydraulic lock The tightening sleeve 52 is deformed and pressed against the driving sleeve 53. The driving sleeve 53 is connected to the driving shaft 3. Pressure oil is arranged in the pressure oil chamber 521. The dividing plate 4 is connected to the machine base 1 through the dividing plate locking mechanism 5. The hydraulic locking sleeve 52 has a pressure oil chamber 521. Under the action of the pressure oil, the hydraulic locking sleeve 52 is elastically deformed and squeezes the driving sleeve 53 downward to generate a friction locking torque. As the pressure increases, the deformation of the hydraulic locking sleeve 52 at the chord section 531 is greater than the elastic deformation at the cylindrical surface. The unevenness of this deformation will produce a mechanical braking effect on the driving sleeve 53 at the chord section 531. Compared with the traditional locking method, not only the locking torque is large, but also the locking can be controlled by adjusting the oil pressure of the pressure oil in the pressure oil chamber 521. The locking will not fail due to the shaking during rotation. The locking effect is good, and different hydraulic locking sleeves 52 can be replaced at any time for maintenance, so the service life is long.

[0021] An oil inlet channel 511 is provided on the locking sleeve base 51 of the utility model, and the oil inlet channel 511 is connected to the pressure oil chamber 521. The oil inlet channel can be connected to an external oil pressure regulating device, etc., so as to facilitate the adjustment of the oil pressure of the pressure oil. The pressure oil in the pressure oil chamber 521 can also be replaced through the oil inlet channel 511, which is convenient for maintenance.

[0022] The connection between the oil inlet channel 511 and the pressure oil chamber 521 of the utility model is provided with a rubber sealing ring 54 to prevent leakage of the pressure oil in the pressure oil chamber 521 and effectively improve the sealing performance.

[0023] The utility model provides a keyway 6 on the drive sleeve 53 and the drive shaft 3, and a flat key 61 is provided in the keyway 6. The drive sleeve 53 is sleeved on the drive shaft 3 through the flat key 61 and the keyway 6. The flat key 61 is used for connection and can withstand the high load and high impact generated by the rotation of the drive shaft 3. The flat key 61 is an A-type flat key, which has good shear strength and can transmit a large torque.

[0024] The utility model also includes a brake mechanism 7 for stopping the dividing plate 4, the brake mechanism 7 includes an oil-containing cavity 71 arranged between the machine base 1 and the dividing plate 4, a brake fixing ring 72 arranged in the oil-containing cavity 71, a brake expansion ring 73 arranged on the brake fixing ring 72 near the side of the drive motor 2, a closed ring 74 arranged on the dividing plate 4 near the side of the drive motor 2, and an oil inlet 75 arranged on the brake fixing ring 72, the oil inlet 75 is connected with the oil-containing cavity 71, the brake expansion ring 73 pushes the brake fixing ring 72 to reciprocate in the vertical direction, and by injecting high-pressure hydraulic oil into the oil-containing cavity 71, the brake expansion ring 73 pushes the brake fixing ring 72 to complete the braking, the closed ring 74 forms a closed space, and the brake mechanism 7 injects oil through the oil inlet 75, compresses the brake expansion ring 73, pushes the brake fixing ring 72 to press the dividing plate 4 to generate a longitudinal locking force, thereby completing the braking.

[0025] In the utility model, an oil seal 8 is arranged between the brake fixing ring 72 and the dividing plate 4, so that the airtightness is better.

[0026] The top of the machine base 1 of the utility model is provided with a lifting ring 9, and the machine tool can be lifted by lifting the lifting ring 9, so that the placement position of the machine tool can be adjusted conveniently and maintenance is convenient.

[0027] Working principle:

[0028] During operation, the dividing plate 4 is connected to the machine base 1 through the dividing plate locking mechanism 5. A pressure oil chamber 521 is provided in the hydraulic locking sleeve 52. Under the action of the pressure oil, the hydraulic locking sleeve 52 is elastically deformed to squeeze the driving sleeve 53 downward to generate a friction locking torque. As the pressure increases, the deformation of the hydraulic locking sleeve 52 at the chord section 531 is greater than the elastic deformation at the cylindrical surface. The unevenness of this deformation will produce a mechanical braking effect on the driving sleeve 53 at the chord section 531. Compared with the traditional locking method, not only is the locking torque large, but the locking can also be controlled by adjusting the oil pressure of the pressure oil in the pressure oil chamber 521. The locking will not fail due to the shaking generated during rotation. The locking effect is good, and different hydraulic locking sleeves 52 can be replaced at any time for maintenance, so the service life is long.

[0029] Of course, the above is only a preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structure, features and principles described in the scope of the present invention patent application are included in the scope of the present invention patent application.

Claims

1. A four-axis CNC turntable, characterized in that: The invention comprises a machine base (1), a driving motor (2) arranged in the machine base (1), a driving shaft (3) arranged at the power output end of the driving motor (2), a dividing plate (4) rotatably arranged on the machine base (1), and a dividing plate locking mechanism (5) for locking the dividing plate (4) on the driving shaft (3), wherein the power output end of the driving motor (2) is drivingly connected to the driving shaft (3), and the power output end of the driving shaft (3) is drivingly connected to the dividing plate (4); the dividing plate locking mechanism (5) comprises a rotating shaft (2) fixedly arranged on the dividing plate (4); A locking sleeve base (51), a hydraulic locking sleeve (52) arranged in the inner cavity of the locking sleeve base (51), and a driving sleeve (53) arranged in the inner cavity of the hydraulic locking sleeve (52); a pressure oil chamber (521) is arranged in the hydraulic locking sleeve (52); the driving sleeve (53) is provided with a plurality of chord sections (531) along the circumferential direction; a gap is provided between the driving sleeve (53) and the hydraulic locking sleeve (52); the driving sleeve (53) is connected to the driving shaft (3); and pressure oil is arranged in the pressure oil chamber (521).

2. The four-axis CNC turntable according to claim 1, characterized in that: An oil inlet channel (511) is provided on the locking sleeve base (51), and the oil inlet channel (511) is communicated with the pressure oil chamber (521).

3. The four-axis CNC turntable according to claim 2, characterized in that: A rubber sealing ring (54) is provided at the connection between the oil inlet channel (511) and the pressure oil chamber (521).

4. The four-axis CNC turntable according to claim 1, characterized in that: A keyway (6) is provided on the drive sleeve (53) and the drive shaft (3), a flat key (61) is provided in the keyway (6), and the drive sleeve (53) is sleeved on the drive shaft (3) by means of the flat key (61) and the keyway (6).

5. The four-axis CNC turntable according to claim 4, characterized in that: The flat key (61) is an A-type flat key.

6. The four-axis CNC turntable according to claim 1, characterized in that: It also includes a brake mechanism (7) for braking the dividing plate (4), the brake mechanism (7) including an oil-containing cavity (71) arranged between the machine base (1) and the dividing plate (4), a brake fixing ring (72) arranged in the oil-containing cavity (71), a brake expansion ring (73) arranged on the brake fixing ring (72) at a position close to one side of the drive motor (2), a closed ring (74) arranged on the dividing plate (4) at a position close to one side of the drive motor (2), and an oil inlet (75) arranged on the brake fixing ring (72), the oil inlet (75) being connected to the oil-containing cavity (71), and the brake expansion ring (73) pushing the brake fixing ring (72) to reciprocate in the vertical direction.

7. The four-axis CNC turntable according to claim 6, characterized in that: An oil seal (8) is provided between the brake fixing ring (72) and the dividing plate (4).

8. The four-axis CNC turntable according to claim 1, characterized in that: A hanging ring (9) is provided on the top of the machine base (1).

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