Direct-drive type vertical lathe workbench

Abstract

The invention discloses a direct-drive vertical lathe workbench which comprises a workbench body and a workbench base, the workbench body is installed on the workbench base, a permanent magnet motor rotor is fixed below the workbench body, a permanent magnet direct-drive motor stator is fixed in the workbench base, and a motor coil is arranged between the permanent magnet direct-drive motor stator and the permanent magnet motor rotor; load-bearing bearings are arranged among the inner side of the permanent magnet motor rotor, the bottom of the workbench and the inner plane of the workbench base; a spindle is arranged in the center of a workbench base, a stepped hole is formed in the center of the workbench, a spindle centering bearing is arranged between the lower end in the workbench and the spindle, and a nut is connected outside the spindle and located above the spindle centering bearing. An encoder fixing sleeve exposed out of the main shaft is installed at the upper end in the main shaft, and the encoder is fixed to the tail end of the bottom of the encoder fixing sleeve. A shaft is installed in the encoder fixing sleeve, and a pre-tightening bearing is installed at the step position of the stepped hole in the workbench. Direct driving of the workbench is achieved through the permanent magnet direct drive motor, and the working precision is improved.

Description

Technical Field

[0001] The invention relates to a direct-drive vertical lathe workbench, belonging to the technical field of machinery. Background Art

[0002] The drive of the traditional CNC vertical lathe workbench adopts the drive mode of motor + gearbox + spindle. Because it is driven by the motor and gearbox, the gear transmission noise is difficult to control, the unstable transmission affects the accuracy of the workpiece, the transmission chain is long and occupies a large space, resulting in a large volume of the workbench base parts, and indirectly increasing the space occupied by the machine tool. The assembly and maintenance are time-consuming and labor-intensive, which reduces the performance parameters of the workbench. At the same time, the production and manufacturing costs remain high, limiting the high-end development of the vertical lathe workbench. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a direct-drive vertical lathe worktable, which realizes direct drive of the worktable through a permanent magnet direct-drive motor, improves working accuracy, avoids the occurrence of noise, and reduces production, manufacturing and maintenance costs.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a direct-drive vertical lathe workbench, comprising a workbench and a workbench base, the workbench is installed on the workbench base, a permanent magnet motor rotor is fixedly connected below the workbench, the permanent magnet direct-drive motor stator is fixedly connected to the workbench base, the permanent magnet motor rotor is located inside the permanent magnet direct-drive motor stator, and a motor coil is arranged between the permanent magnet direct-drive motor stator and the permanent magnet motor rotor; at the upper end of the motor coil, an oil cooling pipeline is arranged on both sides of the outside of the permanent magnet direct-drive motor stator; on the inner side of the permanent magnet motor rotor, a load-bearing bearing is installed between the bottom of the workbench and the inner plane of the workbench base; a vertical main shaft is fixedly connected at the center of the inside of the workbench base, the inside of the main shaft is hollow, and the upper half of the main shaft body has a taper; a vertical stepped hole is arranged at the center of the workbench, and a main shaft centering bearing is installed between the lower end of the inside of the workbench and the outside of the main shaft, and the center of the main shaft centering bearing is an inner ring tapered hole, and the inner ring tapered hole is parallel to the main shaft. The taper part of the shaft is connected with the shaft body, the nut is connected to the outside of the main shaft and is located above the main shaft centering bearing, an oil distribution plate is installed at the bottom of the main shaft, and the shaft body of the main shaft is provided with an oil circuit that is the same as the oil inlet of the oil distribution plate; an encoder fixing sleeve is installed at the upper end of the main shaft, the encoder fixing sleeve is exposed on the main shaft, and the encoder is fixed on the bottom end of the encoder fixing sleeve; a shaft is installed in the encoder fixing sleeve, the upper end of the shaft is exposed on the encoder fixing sleeve, and an expansion sleeve is installed on the shaft above the encoder fixing sleeve; a preload bearing is installed at the step of the stepped hole in the workbench, a preload cover is installed on the outside of the encoder fixing sleeve, the preload cover is located above the preload bearing and the nut, the preload cover is fixed to the upper end of the main shaft, and the preload cover is provided with an oil circuit that communicates with the inside of the main shaft body; above the expansion sleeve, an encoder drive cover is installed inside the workbench, and a protective cover is installed on the top of the encoder drive cover; below the oil cooling pipeline and the motor coil, an oil return hole is provided inside the workbench base.

[0005] The beneficial effects of the present invention are as follows: the present invention eliminates the main drive motor, gear box and other related components, realizes direct drive of the workbench through a permanent magnet direct drive motor, effectively improves the working accuracy, avoids the occurrence of noise, and reduces the cost of production, manufacturing and maintenance; solves the problems of difficult gear transmission noise control in the workbench of a traditional CNC vertical lathe and low machining accuracy caused by unstable transmission; avoids the situation of long transmission chain and large space occupation, large workbench base parts and large machine tool space occupation, and saves time and effort in assembly and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0007] Figure 1 It is a structural schematic diagram of the present invention.

[0008] Numbers in the figure: 1. Workbench, 2. Permanent magnet direct drive motor rotor, 3. Motor coil, 4. Permanent magnet direct drive motor stator, 5. Oil cooling pipeline, 6. Workbench base, 7. Protective cover, 8. Encoder drive cover, 9. Expansion sleeve, 10. Shaft, 11. Encoder, 12. Preload cover, 13. Preload bearing, 14. Spindle centering bearing, 15. Load-bearing bearing, 16. Spindle, 17. Nut, 18. Encoder fixing sleeve, 19. Oil distribution plate, 20. Oil return hole. DETAILED DESCRIPTION

[0009] like Figure 1 As shown, a direct-drive vertical lathe workbench includes a workbench 1 and a workbench base 6, the workbench 1 is installed on the workbench base 6, a permanent magnet motor rotor 2 is fixedly connected below the workbench 1, a permanent magnet direct-drive motor stator 4 is fixedly connected to the workbench base 6, the permanent magnet motor rotor 2 is located inside the permanent magnet direct-drive motor stator 4, and a motor coil 3 is arranged between the permanent magnet direct-drive motor stator 4 and the permanent magnet motor rotor 2; at the upper end of the motor coil 3, both sides of the outside of the permanent magnet direct-drive motor stator 4 are provided with an oil cooling pipeline 5; on the inner side of the permanent magnet motor rotor 2, A load-bearing bearing 15 is installed between the bottom of the workbench 1 and the inner plane of the workbench base 6; a vertical spindle 16 is fixedly connected to the center of the workbench base 6, the inside of the spindle 16 is hollow, and the upper half of the spindle 16 has a taper; a vertical stepped hole is provided at the center of the workbench 1, and a spindle centering bearing 14 is installed between the lower end of the inside of the workbench 1 and the outside of the spindle 16, the center of the spindle centering bearing 14 is an inner ring tapered hole, the inner ring tapered hole is matched with the tapered part of the spindle 16, and the nut 17 is connected to the spindle 16. The main shaft 16 is outside and located above the main shaft centering bearing 14. An oil distribution plate 19 is installed at the bottom of the main shaft 16. The shaft body of the main shaft 16 is provided with an oil circuit that is the same as the oil inlet of the oil distribution plate 19; an encoder fixing sleeve 18 is installed at the upper end of the main shaft 16. The encoder fixing sleeve 18 is exposed on the main shaft 16, and the encoder 11 is fixed on the bottom end of the encoder fixing sleeve 18; a shaft 10 is installed in the encoder fixing sleeve 18, and the upper end of the shaft 10 is exposed on the encoder fixing sleeve 18. Above the encoder fixing sleeve 18, an expansion sleeve 9 is installed on the shaft 10; the workbench A preload bearing 13 is installed at the step of the stepped hole 1, a preload cover 12 is installed outside the encoder fixing sleeve 18, the preload cover 12 is located above the preload bearing 13 and the nut 17, the preload cover 12 is fixed to the upper end of the main shaft 16, and an oil path communicating with the inside of the main shaft 16 is arranged inside the preload cover 12; above the expansion sleeve 9, an encoder drive cover plate 8 is installed inside the workbench 1, and a protective cover plate 7 is installed on the top of the encoder drive cover plate 8; below the oil cooling pipeline 5 and the motor coil 3, an oil return hole 20 is arranged inside the workbench base 6.

[0010] During operation, the workbench is driven to move directly by a permanent magnet direct-drive motor. When current passes through the motor coil 3, a magnetic field is generated by the permanent magnet direct-drive motor stator 4. The permanent magnet direct-drive motor rotor 2 is rotated by the principle of electromagnetic induction. Under the support of the load-bearing bearing 15, the permanent magnet direct-drive motor rotor 2 drives the workbench 1 to rotate on the workbench base 6 with the main shaft 16 as the center; the weight of the workbench 1 and the workpiece acts on the load-bearing bearing 15 together, and a preload is applied to the load-bearing bearing 15 through the preload cover 12 and the preload bearing 13. The preload cover 12 applies a force to the preload bearing 13, and the force adjusted axially by the preload bearing 13 acts on the load-bearing bearing 15 through the workbench 1 to achieve the accuracy of the end face runout of the workbench 1; the radial accuracy of the workbench 1 is controlled by the spindle centering bearing 14, and the spindle centering bearing 14 controls the spindle centering by adjusting the axial distance of the nut 17. The inner ring tapered hole of the bearing 14 cooperates with the main shaft 16 to achieve the radial runout accuracy of the workbench 1; the encoder 11 is fixed on the bottom end of the encoder fixing sleeve 18, and the encoder drives the cover plate 8, the expansion sleeve 9 and the shaft 10 to realize the synchronous rotation with the workbench 1, and the main shaft 16, the encoder 11, the pre-tightening cover 12 and the encoder fixing sleeve 18 do not rotate; the protective cover plate 7 realizes the protection of the central part of the workbench 1; the lubrication of each bearing and the cooling of the motor coil 3 are both realized by recycled anti-wear hydraulic oil, and the cooling of the motor coil 3 is realized by the oil cooling pipeline 5 to deliver the oil to the top of the motor coil 3 and flow into the motor coil 3 for cooling. The lubrication of each bearing is delivered to the position of the pre-tightening cover 12 through the oil distribution plate 19 and the pipeline in the main shaft 6, and each bearing is lubricated from top to bottom. Finally, the lubricating oil flows into the oil storage cavity of the workbench base 6 through the oil return hole 20.

Claims

1. A direct-drive vertical lathe workbench, comprising a workbench (1) and a workbench base (6), wherein the workbench (1) is mounted on the workbench base (6), and characterized in that: A permanent magnet motor rotor (2) is fixedly connected below the workbench (1); a permanent magnet direct drive motor stator (4) is fixedly connected to the workbench base (6); the permanent magnet motor rotor (2) is located inside the permanent magnet direct drive motor stator (4); a motor coil (3) is provided between the permanent magnet direct drive motor stator (4) and the permanent magnet motor rotor (2); a load-bearing bearing (15) is installed on the inner side of the permanent magnet motor rotor (2), between the bottom of the workbench (1) and the inner plane of the workbench base (6); a vertical spindle (16) is fixedly connected at the center of the workbench base (6); the inside of the spindle (16) is hollow; a vertical stepped hole is provided at the center of the workbench (1); a spindle centering bearing (14) is installed between the lower end of the inside of the workbench (1) and the outside of the spindle (16); a nut (17) is connected to the outside of the spindle (16) and is located above the spindle centering bearing (14); a nut (17) is installed at the upper end of the inside of the spindle (16); An encoder fixing sleeve (18), the encoder fixing sleeve (18) is exposed on the main shaft (16), and the encoder (11) is fixed on the bottom end of the encoder fixing sleeve (18); a shaft (10) is installed in the encoder fixing sleeve (18), the upper end of the shaft (10) is exposed on the encoder fixing sleeve (18), and an expansion sleeve (9) is installed on the shaft (10) above the encoder fixing sleeve (18); a preload bearing (13) is installed at the step of the stepped hole in the workbench (1), and the encoder (11) is fixed on the bottom end of ... A pre-tightening cover (12) is installed on the outside of the encoder fixing sleeve (18), the pre-tightening cover (12) is located above the pre-tightening bearing (13) and the nut (17), the pre-tightening cover (12) is fixed to the upper end of the main shaft (16), and an oil passage communicating with the inside of the main shaft (16) is provided inside the pre-tightening cover (12); above the expansion sleeve (9), an encoder drive cover plate (8) is installed inside the workbench (1), and a protective cover plate (7) is installed on the top of the encoder drive cover plate (8).

2. A direct-drive vertical lathe workbench according to claim 1, characterized in that: The upper half of the main shaft (16) has a taper, and the center of the main shaft centering bearing (14) is an inner ring tapered hole, which is matched and connected with the tapered part of the main shaft (16).

3. The direct-drive vertical lathe workbench according to claim 1, characterized in that: An oil cooling pipeline (5) is provided at the upper end of the motor coil (3) and on both sides of the outside of the permanent magnet direct drive motor stator (4).

4. The direct-drive vertical lathe workbench according to claim 1, characterized in that: An oil distribution plate (19) is installed at the bottom of the main shaft (16), and a communicating oil path is provided inside the shaft body of the main shaft (16) and inside the pre-tightening cover (12), and the oil path inside the shaft body of the main shaft (16) is communicated with the oil inlet of the oil distribution plate (19).

5. The direct-drive vertical lathe workbench according to claim 3, characterized in that: An oil return hole (20) is provided inside the workbench base (6) below the oil cooling pipeline (5) and the motor coil (3).

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