CN204524978U - A kind of precise heavy-load Intelligent adjustment huge revolving table - Google Patents

Abstract

The utility model discloses a precision heavy-duty intelligent adjustment large-scale rotary workbench, which includes a main shaft, a base, a worm gear pair, a static pressure bearing, a static pressure guide rail and a servo motor. The processing difficulty is relatively low; the transmission and indexing adopt the anti-backlash structure combined with the double worm gear pair and the hydraulic cylinder follow-up, which improves the transmission accuracy of the workbench; the spindle support adopts the closed static pressure guide rail structure, and the An eddy current sensor is installed to accurately measure the oil film thickness of the static pressure guide rail in real time when the load of the workbench changes, and feed back to the numerical control system at the same time. Finally, the hydraulic system automatically regulates the thickness of the oil film in real time to ensure the static pressure of the workbench Rigidity and load carrying capacity of the guide rail.

Description

A precision heavy-duty intelligent adjustment large-scale rotary table

technical field

The utility model relates to the field of machine tools, in particular to a workbench part of a gear machine tool.

Background technique

The worm gear and the main shaft of the existing large-scale rotary table are connected as a whole for worm gear hobbing processing. The huge load not only greatly restricts the machining accuracy of the worm gear pair, but also causes irreversible damage to the worm gear processing equipment; the existing large-scale rotary table has many A single worm gear pair is used for transmission and indexing. Due to the existence of the backlash of the worm gear pair, the vibration of the machine tool will reduce the machining accuracy and the surface roughness of the workpiece during discontinuous cutting such as gear processing; the existing large rotary table static pressure The oil film thickness of the guide rail cannot be intelligently adjusted according to the size of the load. Therefore, when the load is small, the oil film thickness is large and the rigidity is poor. When the load is large, the oil film thickness becomes smaller, which easily leads to static pressure failure and friction between the guide rails. Scratch.

Contents of the invention

In order to overcome the deficiencies of the prior art above, the utility model provides a precision heavy-duty intelligent adjustment large-scale rotary table that can easily guarantee the machining accuracy of the worm gear pair, can realize backlash-free transmission, and can precisely control the oil film thickness of the hydrostatic guide rail.

The technical scheme adopted in the utility model is:

A precision heavy-duty intelligent adjustment large-scale rotary table, including a main shaft, a base, a worm gear pair, a hydrostatic bearing, a hydrostatic guide rail, and a servo motor. Two parts, the table top of the workbench is connected with the worm gear body, the driving worm gear and the anti-backlash worm gear are fixed on the worm gear body, the driving worm meshes with the driving worm gear, the servo motor drives the driving worm, the anti-backlash worm meshes with the anti-backlash worm gear, and the active A gear transmission pair is installed on the worm and the anti-backlash worm, a two-way oil cylinder is installed on one end of the anti-backlash worm, and an eddy current sensor is arranged on the static pressure guide rail.

The gear transmission pair drives the anti-backlash worm to rotate.

The active worm gear and the active worm, the anti-backlash worm gear and the anti-backlash worm jointly constitute a double worm gear pair, and the double worm gear pair and the two-way oil cylinder form an anti-backlash structure, which can ensure that the worm gear pair can realize backlash-free transmission even if it is worn, and improves the The transmission accuracy of the workbench.

The two-way oil cylinder can generate a certain amount of axial thrust on the anti-backlash worm, and the direction of the force is opposite to the rotation direction of the worm gear body, and a certain damping is applied to the rotation of the worm gear body and the table, so that the meshing teeth of the driving worm and the driving worm gear The surfaces are always in contact, improving the stability of the spindle rotation and transmission accuracy.

A direct connection is adopted between the servo motor and the driving worm.

The eddy current sensor can accurately measure the oil film thickness of the static pressure guide rail in real time when the load of the workbench changes, and feed back to the numerical control system at the same time. Finally, the hydraulic system can automatically adjust the thickness of the oil film in real time to ensure the static pressure guide rail of the workbench. stiffness and load carrying capacity.

The utility model has the following beneficial effects:

Compared with the prior art, the utility model has the beneficial effect of improving the rotary positioning accuracy and repeat positioning accuracy of the workbench, especially in the case of heavy-duty cutting and discontinuous cutting, the oil film thickness of the hydrostatic guide rail of the workbench can be achieved. Intelligent adjustment ensures the rigidity of the workbench and improves the bearing capacity of the workbench.

The above-mentioned main shaft adopts a split structure, which is divided into two parts: the table top and the worm gear body, thereby effectively reducing the load of the machine tool when machining large worm gear pairs, reducing the outer dimension during machining, and helping to improve the machining accuracy of worm gears.

The above-mentioned active worm gear and active worm, the anti-backlash worm gear and the anti-backlash worm together constitute a double worm gear pair, and the double worm gear pair and the two-way oil cylinder form an anti-backlash structure, which can ensure that the worm gear pair can realize backlash-free transmission even if it is worn, and improves the work efficiency. The transmission accuracy of the table.

The above-mentioned two-way oil cylinder can generate a certain amount of axial thrust on the anti-backlash worm, and the direction of the force is opposite to the rotation direction of the worm gear body, and a certain damping is applied to the rotation of the worm gear body and the table, so that the meshing tooth surface of the driving worm and the driving worm gear Always maintain contact to improve the stability of the spindle rotation and transmission accuracy.

The above-mentioned servo motor and the driving worm are directly connected, which shortens the transmission chain and improves the transmission efficiency.

The above-mentioned eddy current sensor can accurately measure the oil film thickness of the static pressure guide rail in real time when the load of the workbench changes, and feed back to the numerical control system at the same time. Finally, the oil film thickness is automatically adjusted in real time through the hydraulic system to ensure the stability of the static pressure guide rail of the workbench. stiffness and load carrying capacity.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is the main structure schematic diagram of the present utility model;

Fig. 2 is a schematic diagram of the anti-backlash structure of the combination of the double worm gear and worm pair and the hydraulic cylinder follow-up phase described in the present invention.

In the figure: table top 1, worm gear body 2, driving worm gear 3, driving worm 4, anti-backlash worm gear 5, anti-backlash worm 6, eddy current sensor 7, base 8, gear transmission pair 9, servo motor 10, two-way oil cylinder 11.

A and B are the oil inlet and the oil outlet of the two-way oil cylinder.

Detailed ways

Embodiments of the present utility model will be further described below in conjunction with the accompanying drawings.

See Figure 1-2, the specific installation and connection methods in the figure are, a precision heavy-duty intelligent adjustment large-scale rotary table, including a main shaft, a base, a worm gear pair, a hydrostatic bearing, a hydrostatic guide rail and a servo motor. The main shaft adopts a split structure, and the main shaft of the workbench is divided into two parts: the table top 1 and the worm gear body 2. The table top 1 of the workbench is connected to the worm gear body 2. 4 is meshed with the driving worm gear 3, the servo motor 10 drives the driving worm 4, the anti-backlash worm 6 is meshed with the anti-backlash worm gear 5, a gear transmission pair 9 is installed on the driving worm 4 and the anti-backlash worm 6, and one end of the anti-backlash worm 6 A two-way oil cylinder 11 is installed, and an eddy current sensor 7 is arranged on the static pressure guide rail.

Preferably, the gear transmission pair 9 drives the anti-backlash worm 6 to rotate.

Preferably, the driving worm gear 3 and the driving worm 4, the anti-backlash worm gear 5 and the anti-backlash worm 6 jointly form a double worm gear pair, and the double worm gear pair and the two-way oil cylinder 11 form an anti-backlash structure, which can ensure that the worm gear pair is not damaged even if it is worn. It can realize gapless transmission and improve the transmission precision of the workbench.

Preferably, the two-way oil cylinder 11 can generate a certain amount of axial thrust on the anti-backlash worm 6, and the direction of the force is opposite to the rotation direction of the worm gear body 2, and a certain damping is applied to the rotation of the worm gear body 2 and the table 1, so that The meshing tooth surfaces of the driving worm 4 and the driving worm gear 3 are always in contact, so that the stability of the main shaft rotation and the transmission accuracy are improved.

Preferably, a direct connection is adopted between the servo motor 10 and the driving worm 4 .

Further, the eddy current sensor 7 can accurately measure the oil film thickness of the hydrostatic guide rail in real time when the load of the workbench changes, and feed back to the numerical control system at the same time, and finally automatically adjust the oil film thickness in real time through the hydraulic system to ensure that the work Rigidity and bearing capacity of the hydrostatic guideway.

The concrete work process and principle of the device of the present utility model are:

The table top 1 of the workbench is connected with the worm gear body 2, the driving worm gear 3 and the anti-backlash worm gear 5 are fixed on the worm gear body 2, and the servo motor 10 drives the driving worm gear 4 to rotate, thereby driving the worm gear body 2 and the table top 1 to rotate. The gear pair 9 on the active worm 4 and the anti-backlash worm 6 drives the anti-backlash worm 6 to rotate, and the two-way oil cylinder 11 installed at one end of the anti-backlash worm 6 produces a certain amount of axial thrust on the anti-backlash worm 6, and the direction of the force is the same as that of the worm wheel. The rotation direction of the body 2 is opposite, that is, a certain damping is applied to the rotation of the worm gear body 2 and the table 1, so that the meshing tooth surfaces of the driving worm 4 and the driving worm 3 are always in contact, and the stability and transmission accuracy of the main shaft rotation are improved; An eddy current sensor 7 is installed on the pressure guide rail to monitor the change of the static pressure oil film thickness in real time and accurately, and the data is fed back to the numerical control system. The proportional servo valve adjusts the inlet flow of the static pressure oil chamber to accurately measure the oil film thickness. Compensation, so that the workbench can still maintain high rigidity when the load changes greatly, ensuring the heavy load capacity and high stability of the workbench.

Claims (6)

1. A precision heavy-duty intelligent adjustment large-scale rotary table, including a main shaft, a base, a worm gear pair, a hydrostatic bearing, a hydrostatic guide rail and a servo motor, characterized in that: the main shaft adopts a split structure, and the main shaft of the work table It is divided into two parts: the table top (1) and the worm gear body (2). The table top (1) of the workbench is connected with the worm gear body (2), and the driving worm gear (3) and the anti-backlash worm gear (5) are fixed on the worm gear body (2). Above, the driving worm (4) meshes with the driving worm gear (3), the servo motor (10) drives the driving worm (4), the anti-backlash worm (6) meshes with the anti-backlash worm gear (5), the driving worm (4) and A gear transmission pair (9) is installed on the anti-backlash worm (6), a two-way oil cylinder (11) is installed on one end of the anti-backlash worm (6), and an eddy current sensor (7) is arranged on the static pressure guide rail. 2. A precision heavy-duty intelligent adjustment large-scale rotary table according to claim 1, characterized in that: the gear transmission pair (9) drives the anti-backlash worm (6) to rotate. 3. A precision heavy-duty intelligent adjustment large-scale rotary table according to claim 1, characterized in that: the active worm gear (3) and the active worm (4), the anti-backlash worm (5) and the anti-backlash worm ( 6) Together they form a double worm gear pair, and the double worm gear pair and the two-way oil cylinder (11) form an anti-backlash structure, which can ensure that the worm gear pair can realize backlash-free transmission even if the worm gear pair is worn, and improves the transmission accuracy of the workbench. 4. A precision heavy-duty intelligent adjustment large-scale rotary table according to claim 1 or 3, characterized in that: the two-way oil cylinder (11) can generate a certain amount of axial thrust on the anti-backlash worm (6), And the direction of the force is opposite to the rotation direction of the worm gear body (2), and a certain damping is applied to the rotation of the worm gear body (2) and the table (1), so that the meshing tooth surfaces of the driving worm (4) and the driving worm gear (3) are always Maintain contact to improve the stability of the spindle rotation and transmission accuracy. 5. The precision heavy-duty intelligent adjustment large-scale rotary table according to claim 1, characterized in that: the servo motor (10) and the driving worm (4) are directly connected. 6. A precision heavy-duty intelligent adjustment large-scale rotary workbench according to claim 1, characterized in that: the eddy current sensor (7) can monitor the oil film thickness of the static pressure guide rail in real time when the load on the workbench changes. Accurate measurement and feedback to the numerical control system at the same time, and finally the real-time automatic regulation of the oil film thickness through the hydraulic system to ensure the rigidity and bearing capacity of the hydrostatic guide rail of the workbench.