CN206140292U - Grinding machine static and dynamic pressure work piece axle construction - Google Patents

Abstract

The utility model discloses a dynamic and static pressure workpiece shaft structure of a grinding machine, the main content is: the main shaft is provided with a keyway, the synchronous toothed belt wheel is installed on the main shaft through a common flat key, and the double nuts are installed on the main shaft And the front end of the double nut is pushed against the bottom surface of the groove of the synchronous toothed pulley, the rear end of the main shaft is installed in the inner hole of the housing through the rear hydrodynamic bearing, and the front end of the rear hydrodynamic bearing is pushed against the shell. On the bottom surface of the rear end groove of the hole in the body, the rear end cover is fixed on the rear end surface of the housing by screws, the front end of the main shaft is installed in the inner hole of the housing through the front hydrodynamic bearing, and the front liquid The rear end surface of the dynamic and static pressure bearing is on the bottom surface of the front groove of the inner hole of the housing, the spacer is installed on the main shaft and the rear end surface of the spacer is on the front end of the housing, and the front end cover is fixedly installed on the front end of the spacer face.

Description

A Grinder Dynamic and Static Workpiece Shaft Structure

technical field

The utility model relates to the technical field of workpiece shafts, in particular to a dynamic and static pressure workpiece shaft structure for a grinding machine.

Background technique

The rotating part of the workpiece shaft of the existing grinding machine is supported by a rolling bearing. Under normal working conditions, the rotation speed of the workpiece shaft is adjusted between 800r/min and 3000r/min. The front end of the shaft generally clamps the workpiece through the ferromagnetic core and the electromagnetic chuck part. When assembling the workpiece shaft, it is difficult to ensure that the radial runout of the front end of the workpiece shaft is not greater than 0.002mm and the end runout is not greater than 0.0015mm based on the error accumulation of each component. Sometimes, in order to ensure the accuracy of the workpiece shaft, overall trimming is required. At the same time, a sealing structure is designed on the front end of the workpiece shaft, which is a labyrinth sealing structure composed of a sealing ring and a sealing cover, and cooperates with the skeleton sealing ring on the front cover to effectively prevent the infiltration of grinding fluid and dust, so as not to cause the rolling bearing of the workpiece shaft damage.

However, in the actual production process, after the workpiece shaft has been working for a period of time, due to factors such as the reduction of rolling bearing precision and the reduction of preload load, the accuracy of the workpiece shaft is reduced, which in turn affects the precision and roughness level of the processed workpiece, so it has to be replaced. Work axis or downgrade to use.

Utility model content

The technical problem to be solved by the utility model is to aim at the deficiencies in the above-mentioned prior art, and disclose a dynamic and static pressure workpiece shaft structure of a grinder, which uses a liquid dynamic and static pressure bearing instead of an ordinary rolling bearing, thereby improving the bearing capacity and rigidity of the workpiece shaft, ensuring Under long-term working conditions, the rotation accuracy of the spindle is basically unchanged, prolonging the service life of the workpiece shaft and improving the reliability of the spindle.

The technical solution adopted by the utility model to solve the technical problem is: a grinding machine dynamic and static pressure workpiece shaft structure, including double nuts, ordinary flat keys, synchronous toothed belt pulley, rear hydrodynamic and static pressure bearing, front hydrodynamic and static pressure bearing, front end Cover, main shaft, spacer, shell and rear end cover; the main shaft is provided with a keyway, the synchronous toothed pulley is installed on the main shaft through an ordinary flat key, the double nut is installed on the main shaft and the front end of the double nut The top surface is on the bottom surface of the groove of the synchronous toothed pulley, the rear end of the main shaft is installed in the inner hole of the housing through the rear hydrodynamic bearing, and the front end of the rear hydrodynamic bearing is pushed against the rear of the inner hole of the housing. On the bottom surface of the end groove, the rear end cover is fixed on the rear end surface of the housing by screws, the front end of the main shaft is installed in the inner hole of the housing through the front hydrodynamic bearing, and the rear end of the front hydrodynamic bearing is The end face bears on the bottom surface of the front end groove of the inner hole of the housing, the spacer is installed on the main shaft and the rear end of the spacer is against the front end of the housing, and the front end cover is fixedly installed on the front end of the spacer.

As a preferred embodiment of the present utility model, the housing is provided with an oil inlet and outlet passage.

As a preferred embodiment of the present utility model, two annular grooves are designed on the front part of the rear hydrodynamic and static pressure bearing, and four small hole restrictors are evenly distributed in the annular groove near the end surface, and the other annular groove It is designed with a pressure measuring oil hole, and 4 shallow oil chambers are designed on the inner surface of the rear hydrodynamic and static pressure bearing.

As a preferred embodiment of the present utility model, the front hydrodynamic and static pressure bearing is designed with three annular grooves, and four oil inlet holes are evenly distributed in an annular groove in the middle, and the diameter of the upper section of the oil inlet hole is 4mm, the diameter of the 2mm hole at the lower end is 0.8mm, and a pressure measuring oil hole is designed in an annular groove in the rear section.

After the oil supply system is started, the throttling effect of the liquid resistance formed by the shallow cavity is used to make the bearing have a hydrostatic effect, float the main shaft and suspend it in the middle of the oil film, overcome the dry friction phenomenon that occurs when the dynamic pressure bearing starts, and improve the bearing performance. lifespan. After the main shaft rotates, relying on the dynamic pressure bearing capacity formed by its unique shallow cavity step effect, the rigidity of the main shaft is greatly improved. Adopt 1-way oil inlet, enter the external ring groove of the front and rear bearings through the front and rear ends of the upper part of the shell, and reach the radial surface of the spindle from the four uniformly distributed oil inlet holes in the ring groove of the hydrodynamic and static pressure bearing to form an annular oil film, and then from the front and rear bearings The 4 oil unloading grooves evenly distributed inside will finally collect and flow out from the oil outlet hole at the lower part of the housing.

Compared with the prior art, the utility model has the following advantages:

The utility model discloses a grinding machine dynamic and static pressure workpiece shaft structure, which uses a liquid dynamic and static pressure bearing instead of a common rolling bearing, which improves the bearing capacity and rigidity of the workpiece shaft, ensures that the rotation accuracy of the main shaft remains basically unchanged under long-term working conditions, and prolongs the length of the workpiece. The service life of the shaft is improved, and the reliability of the main shaft is improved.

Description of drawings

Fig. 1 is a schematic structural view of a specific embodiment of the present invention.

Explanation of reference signs:

1: Double nuts, 2: Ordinary flat key, 3: Synchronous toothed pulley, 4: Rear hydrodynamic bearing, 5: Front hydrodynamic bearing, 6: Front end cover, 7: Main shaft, 8: Spacer ring, 9 : housing, 10: rear end cover.

detailed description

Describe the specific implementation of the utility model below in conjunction with accompanying drawing and embodiment:

It should be noted that the structures, proportions, sizes, etc. shown in the drawings attached to this specification are only used to match the content disclosed in the specification, for those who are familiar with this technology to understand and read, and are not used to limit the scope of the utility model. The limited conditions of implementation, any modification of structure, change of proportional relationship or adjustment of size, without affecting the effect and the purpose that the utility model can produce, should still fall within the technology disclosed in the utility model. within the scope of the content.

At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit this specification. The practicable range of the utility model, and the change or adjustment of its relative relationship, without any substantial change in the technical content, shall also be regarded as the practicable scope of the utility model.

As shown in Figure 1, it shows the specific implementation of the utility model; as shown in the figure, a kind of grinding machine dynamic and static pressure workpiece shaft structure disclosed by the utility model includes double nuts 1, ordinary flat keys 2, synchronous tooth Pulley 3, rear hydrodynamic and static pressure bearing 4, front hydrodynamic and static pressure bearing 5, front end cover 6, main shaft 7, spacer ring 8, housing 9 and rear end cover 10; said main shaft 7 is provided with a keyway, and said synchronous The toothed belt pulley 3 is installed on the main shaft 7 through the common flat key 2, the double nut 1 is installed on the main shaft 7 and the front end of the double nut 1 abuts on the bottom surface of the groove of the synchronous toothed belt pulley 3, and the main shaft 7 The rear end is installed in the inner hole of the housing 9 through the rear hydrodynamic and static pressure bearing 4, the front end of the rear hydrodynamic and static pressure bearing 4 is pushed against the bottom surface of the rear end groove of the inner hole of the housing 9, and the rear end cover 10 It is fixedly installed on the rear end surface of the housing 9 by screws, the front end of the main shaft 7 is installed in the inner hole of the housing 9 through the front hydrodynamic bearing 5, and the rear end surface of the front hydrodynamic bearing 5 is pushed against the housing 9 On the bottom surface of the front end groove of the inner hole, the spacer ring 8 is installed on the main shaft 7 and the rear end face of the spacer ring 8 is on the front end face of the housing 9, and the front end cover 6 is fixedly installed on the front end face of the spacer ring 8 .

Preferably, the casing 9 is provided with an oil inlet and outlet passage.

Preferably, the front part of the rear hydrodynamic bearing 4 is designed with 2 annular grooves, and the annular groove near the end face is designed with 4 uniformly distributed small hole restrictors, and the other annular groove is designed with a pressure measuring oil hole. 4 shallow oil cavities are designed on the inner surface of the rear hydrodynamic and static pressure bearing 4 .

The front end cover 6 is designed with oil inlet and oil return holes, and communicates with the oil inlet and oil return holes of the spacer ring 8, and a small hole restrictor is installed inside the front end cover 6, and the pressure oil enters the front end cover through the oil inlet hole After 6, it is divided into two paths, one path reaches the inner side of the front end cover 6 through the radial oil path, and the axial small hole restrictor sprays to the front end surface of the step of the main shaft 7 to form a certain axial pressure to prevent the axial movement of the main shaft 7, and at the same time , the other pressure oil reaches the radial periphery of the main shaft 7 through the radial oil hole and the inclined hole, and plays a role of radial support and sealing for the main shaft 7.

The preferred embodiment of the utility model has been described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned embodiment. Make various changes.

Many other changes and modifications can be made without departing from the spirit and scope of the present invention. It should be understood that the invention is not limited to specific embodiments, and the scope of the invention is defined by the appended claims.

Claims (4)

1. A grinding machine dynamic and static pressure workpiece shaft structure, characterized in that it includes double nuts, common flat keys, synchronous toothed belt pulleys, rear hydrodynamic and static pressure bearings, front hydrodynamic and static pressure bearings, front end covers, main shafts, spacers, shells Body and rear end cover; the main shaft is provided with a keyway, the synchronous toothed pulley is installed on the main shaft through a common flat key, the double nut is installed on the main shaft and the front end of the double nut is pressed against the synchronous toothed pulley On the bottom surface of the groove, the rear end of the main shaft is installed in the inner hole of the housing through the rear hydrodynamic bearing, and the front end surface of the rear hydrodynamic bearing is pushed against the bottom surface of the groove at the rear end of the inner hole of the housing. The rear end cover is fixed on the rear end surface of the housing by screws, the front end of the main shaft is installed in the inner hole of the housing through the front hydrodynamic and static pressure bearing, and the rear end surface of the front hydrodynamic and static pressure bearing is pushed against the front end of the inner hole of the housing On the bottom surface of the groove, the spacer is installed on the main shaft and the rear end of the spacer is against the front end of the housing, and the front end cover is fixedly installed on the front end of the spacer. 2 . The dynamic and static pressure workpiece shaft structure of a grinding machine according to claim 1 , wherein an oil inlet and outlet passage is provided on the housing. 3 . 3. A grinding machine dynamic and static pressure workpiece shaft structure according to claim 1, characterized in that: the front part of the rear hydrodynamic and static pressure bearing is designed with 2 annular grooves, and the annular groove near the end surface is designed with 4 evenly distributed A small hole restrictor, the other annular groove is designed with a pressure measuring oil hole, and 4 shallow oil chambers are designed on the inner surface of the rear hydrodynamic and static pressure bearing. 4. A grinding machine dynamic and static pressure workpiece shaft structure according to claim 1, characterized in that: the front hydrodynamic and static pressure bearing is designed with 3 annular grooves, and a uniformly distributed ring groove is designed in the middle 4 oil inlet holes, the diameter of the upper section of the oil inlet hole is 4mm, the diameter of the small hole 2mm at the lower end is 0.8mm, and a ring groove in the rear section is designed with a pressure measuring oil hole.