Hydraulic supporting mechanism

Abstract

The utility model relates to the technical field of motorized spindles, in particular to a hydraulic supporting mechanism which is arranged on a spindle, the spindle comprises a shell core shaft, two ends of the core shaft are connected with a front bearing and a rear bearing assembly, the rear bearing assembly is provided with a rear bearing seat and a rear bearing, and the hydraulic supporting mechanism comprises a hydraulic bearing, a flow controller and a hydraulic station. A rear seat connected to the rear end of the shell is arranged outside the rear bearing seat, a fluid cavity and a fluid channel communicated with the fluid cavity are formed in the inner wall of the rear seat, the hydraulic bearing is installed in the fluid cavity, one end of the fluid channel is an oil inlet, the other end of the fluid channel is an oil return port, and the oil return port is connected with a hydraulic station through a pipeline. And the hydraulic station is connected to the oil inlet after being connected with the throttler through a pipeline, so that a fluid circulation loop is formed. On the basis of a traditional motorized spindle, a hydraulic bearing mechanism is additionally arranged on the supporting portion of a rear bearing, rigid connection between a rear bearing seat and a rear seat is changed into high-damping connection, vibration can be effectively restrained, and therefore machining vibration marks are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electric spindles, in particular to a hydraulic support mechanism. Background Art

[0002] An electric spindle, also known as an electric spindle unit or a direct drive spindle, is a mechanical component integrating a motor and precision bearings. The design of the electric spindle aims to provide high-speed, high-precision, and high-rigidity drive to meet the strict requirements of modern manufacturing for efficiency and machining quality.

[0003] When a traditional electric spindle is working, the front bearing bears the radial force and axial force generated during machining, and the rear bearing provides the support for the stable shaft system. The front bearing is rigidly connected to the spindle housing, and the rear bearing is rigidly connected to the rear bearing seat. The conduction and attenuation of vibration energy are limited, resulting in poor surface finish and geometric tolerance of the machined object. The vibration attenuation is as shown in Figure 1 where the horizontal axis t is time and the vertical axis x is amplitude. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies in the prior art and provide a hydraulic support mechanism.

[0005] The technical solution adopted by the utility model to solve its technical problem is: a hydraulic support mechanism is arranged on the spindle. The spindle includes a housing and a core shaft located inside the housing. The two ends of the core shaft are connected with a front bearing and a rear bearing assembly. The rear bearing assembly has a rear bearing seat and a rear bearing. The hydraulic support mechanism includes a hydraulic bearing, a throttle, and a hydraulic station. A rear seat connected to the rear end of the housing is arranged outside the rear bearing seat. A fluid cavity is opened on the inner wall of the rear seat. The hydraulic bearing is installed in the fluid cavity. A fluid channel communicating with the fluid cavity is also opened in the rear seat. One end of the fluid channel is an oil inlet, and the other end is an oil return port. The oil return port is connected to the hydraulic station through a pipeline. The hydraulic station is connected to the throttle through a pipeline and then connected to the oil inlet to form a fluid circulation loop.

[0006] Further, the front end of the housing is connected with a front seat, and the front bearing is installed on the inner wall of the front seat.

[0007] Furthermore, a gland is arranged on the core shaft at the front end face of the front seat.

[0008] The beneficial effect of the utility model is: on the basis of the traditional electric spindle, a hydraulic bearing mechanism is added to the rear bearing support part. The connection between the rear bearing seat and the rear seat (housing) is changed from a rigid connection to a high-damping connection, which can effectively suppress vibration, reduce the generation of machining vibration marks, and improve the surface quality and geometric tolerance of the machined parts. Description of the Drawings

[0009] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0010] Figure 1 It is a vibration time history diagram during the machining process of an electric spindle in the prior art.

[0011] Figure 2 It is a structural schematic diagram of the present utility model.

[0012] Figure 3 It is a vibration time history diagram during the machining process of the present utility model.

[0013] In the figure: 100. Spindle, 1. Housing, 2. Core shaft, 3. Front bearing, 4. Rear bearing seat, 5. Rear bearing, 6. Hydrostatic bearing, 7. Throttle, 8. Hydraulic station, 9. Rear seat, 10. Front seat, 11. Gland, 12. Fluid chamber, 13. Fluid passage, 14. Oil inlet, 15. Oil return port. Specific embodiments

[0014] The present utility model will now be further described in conjunction with the accompanying drawings. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present utility model in a schematic manner, so they only show the components related to the present utility model.

[0015] As Figure 2 shown, a hydrostatic support mechanism is provided on the spindle 100. The spindle 100 includes a housing 1 and a core shaft 2 located inside the housing 1. The two ends of the core shaft 2 are connected with a front bearing 3 and a rear bearing assembly. The front end of the housing 1 is connected with a front seat 10, and the front bearing 3 is installed on the inner wall of the front seat 10. A front gland 11 is provided on the core shaft 2 on the front end face of the front seat 10. The rear bearing assembly has a rear bearing seat 4 and a rear bearing 5. A rear seat 9 connected to the rear end of the housing 1 is provided outside the rear bearing seat 4. A fluid chamber 12 and a fluid passage 13 communicating with the fluid chamber 12 are provided on the inner wall of the rear seat 9. One end of the fluid passage 13 is an oil inlet 14, and the other end is an oil return port 15.

[0016] Specifically, the hydrostatic support mechanism includes a hydrostatic bearing 6, a throttle 7, and a hydraulic station 8. The hydrostatic bearing 6 is installed in the fluid chamber 12 of the rear seat 9. The oil return port 15 is connected to the hydraulic station 8 through a pipeline. The hydraulic station 8 is connected to the throttle 7 through a pipeline and then connected to the oil inlet 14 to form a fluid circulation loop.

[0017] The working mode of the hydraulic support mechanism in this embodiment is as follows: The hydraulic oil is pressurized by the hydraulic station 8, then flows to the restrictor 7. After being throttled by the restrictor 7, it enters the circulation channel 13 through the oil inlet 14 and then enters the fluid chamber 12, so that the hydraulic bearing 6 in the fluid chamber 12 forms a state similar to an oil pad, making the rear bearing 5 and the rear seat 9 change from the original rigid contact to a high-damping elastic contact. The excess hydraulic oil in the fluid chamber 2 then returns to the hydraulic station 8 through the oil return port 15, forming an oil circuit cycle, and can be continuously used under a sealed state.

[0018] As Figure 3 shown, it is a schematic diagram of the vibration attenuation during the processing of the hydraulic support mechanism in this embodiment. There is a certain vibration when the main shaft 100 is started, and there is basically no vibration subsequently, which can ensure the surface quality and geometric tolerance of the workpiece to be machined.

[0019] The above embodiments are only for explaining the technical concept and characteristics of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it, and it cannot be used to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A hydraulic support mechanism is provided on the main shaft (100). The main shaft (100) includes a housing (1) and a mandrel (2) located inside the housing (1). Both ends of the mandrel (2) are connected with a front bearing (3) and a rear bearing assembly. The rear bearing assembly has a rear bearing seat (4) and a rear bearing (5), and is characterized in that: The hydraulic support mechanism includes a hydraulic bearing (6), a throttle (7) and a hydraulic station (8). A rear seat (9) connected to the rear end of the housing (1) is provided outside the rear bearing seat (4). A fluid chamber (12) is formed on the inner wall of the rear seat (9). The hydraulic bearing (6) is installed in the fluid chamber (12). A fluid passage (13) communicating with the fluid chamber (12) is further formed in the rear seat (9). One end of the fluid passage (13) is an oil inlet (14), and the other end thereof is an oil return port (15). The oil return port (15) is connected to the hydraulic station (8) through a pipeline. The hydraulic station (8) is connected to the throttle (7) through a pipeline and then connected to the oil inlet (14) to form a fluid circulation loop.

2. The hydraulic support mechanism according to claim 1, characterized in that: The front end of the housing (1) is connected to a front seat (10), and the front bearing (3) is installed on the inner wall of the front seat (10).

3. The hydraulic support mechanism according to claim 2, wherein: A gland (11) is arranged on a mandrel (2) on the front end face of the front seat (10).

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