Cutter grinding machine direct drive rotating mechanism with positive pressure blowing function

Abstract

The utility model discloses a cutter grinding machine direct-drive rotating mechanism with a positive pressure blowing function, which belongs to the technical field of numerical control grinding machine accessories, a main shaft is rotatably mounted in a rotating mechanism body, a direct-drive motor rotor is sleeved on the main shaft, a direct-drive motor stator is arranged in the rotating mechanism body, and a front cover is arranged at one end of the rotating mechanism body. A rotating disc face is arranged at one end of the main shaft, a first sealing ring and a positive-pressure blowing gap are arranged between the rotating disc face and the front cover, a positive-pressure blowing opening is formed in the rotating mechanism body, and the positive-pressure blowing opening is communicated with the positive-pressure blowing gap through a positive-pressure blowing channel arranged in the rotating mechanism body. The air pressure source is connected to the positive pressure air blowing inlet, airflow enters the positive pressure air blowing gap through the positive pressure air blowing channel to form a positive pressure air blowing sealing system between the rotating disc face and the front cover, external cutting fluid or other impurities are effectively prevented from entering the interior of the direct-drive rotating mechanism body, meanwhile, no abrasion exists, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to numerical control grinding machine accessory technical field especially a straight drive rotary mechanism of tool grinder of positive pressure blow function. BACKGROUND

[0002] In recent years, under the impetus of high-tech, the traditional manufacturing technology has developed rapidly, and the emerging digital manufacturing technology has been widely applied compared with the traditional manufacturing technology. The driving force of development comes from the strong pursuit of manufacturing efficiency in manufacturing industry. Under this background, the tool manufacturing and application technology taking manufacturing industry as the main service object develops rapidly, a large number of high-speed flexible composite environmentally friendly numerical control tools and application new technologies emerge in an endless stream, which fundamentally changes the traditional cutting technology. At present, one of the core components on the numerical control tool grinder is the rotary mechanism, which is mainly changed from mechanical transmission to motor direct drive mode, reduces the cumulative error of intermediate loss and installation, and ensures that the tool raw material realizes high-speed and stable rotation on the rotary mechanism.

[0003] At present, the main core component of the direct drive rotary mechanism widely used in numerical control tool grinder is the motor direct drive mode plus grating ruler as position feedback to realize the functions of rotation and positioning. The front end of the main shaft is sealed in the form of rotary oil seal. Long-term use will also cause wear and tear, which will lead to the entry of cutting fluid and bearing wear. The motor iron core heating will cause excessive load and even damage. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a straight drive rotary mechanism of tool grinder of positive pressure blow function to solve the above problems existing in the prior art.

[0005] Technical scheme: a straight drive rotary mechanism of tool grinder of positive pressure blow function, including the main shaft, the main shaft is rotatably installed in the rotary mechanism body, the direct drive motor rotor is sleeved on the main shaft, the direct drive motor stator is arranged in the rotary mechanism body, the front cover is arranged at one end of the rotary mechanism body, the rotary disc surface is arranged at one end of the main shaft, the first sealing ring and the positive pressure blow gap are arranged between the rotary disc surface and the front cover, the positive pressure blow port is arranged on the rotary mechanism body, and the positive pressure blow port is communicated with the positive pressure blow gap through the positive pressure blow channel arranged in the rotary mechanism body.

[0006] Further, the circular time grating rotor is installed on the main shaft, the circular time grating stator is installed on the rotary mechanism body, and the circular time grating rotor and the circular time grating stator are used in cooperation.

[0007] Further, the circular time grating stator is installed on the rotary mechanism body through the stator fixing ring.

[0008] Further, the circular time grid stator is installed on the stator fixing ring through the mover fixing sleeve, and the stator fixing ring is installed on the rotating mechanism body.

[0009] Further, the main shaft is sleeved with a shaft diameter pre-pressing bearing at one end, and the shaft diameter pre-pressing bearing is installed between the main shaft and the rotating mechanism body.

[0010] Further, the rotating mechanism body is provided with a rear cover at the other end, and a second sealing ring is arranged between the rear cover and the mover fixing sleeve.

[0011] Further, the outer wall of the direct drive motor stator is provided with a plurality of cooling groove rings.

[0012] Further, the rotating mechanism body is provided with a cooling liquid inlet and a cooling liquid outlet, and the cooling liquid inlet and the cooling liquid outlet are communicated with the cooling groove rings through a cooling liquid channel arranged in the rotating mechanism body.

[0013] Further, adjacent cooling groove rings are communicated with each other.

[0014] Further, the rotating mechanism body is provided with a circular time grid signal line interface and a direct drive motor power line interface.

[0015] Beneficial effects: the application utilizes the positive pressure blowing structure, so that the internal pressure is greater than the external pressure, the sealing performance and the service life are ensured, specifically, the air pressure source is connected to the positive pressure blowing inlet, the airflow enters the positive pressure blowing gap between the rotating disc surface and the front cover through the positive pressure blowing channel to form a positive pressure blowing sealing system, external cutting fluid or other impurities are effectively prevented from entering the internal part of the direct drive rotating mechanism body, meanwhile, there is no any abrasion, and the service life is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the internal structure schematic view of the utility model;

[0017] Figure 2 is the Figure 1 partial enlarged view of A in the utility model;

[0018] Figure 3 is the cooling liquid inlet position schematic view of the utility model;

[0019] Figure 4 is the three-dimensional view of the utility model.

[0020] The figure mark is: rotating mechanism body 1, main shaft 2, direct drive motor stator 3, direct drive motor rotor 4, front cover 5, rotating disc surface 6, first sealing ring 7, positive pressure blowing gap 8, positive pressure blowing port 9, positive pressure blowing channel 10, circular time grid rotor 11, rotor support sleeve 111, circular time grid stator 12, rotor fixing sleeve 13, stator fixing ring 14, shaft diameter pre-pressing bearing 15, rear cover 16, second sealing ring 17, cooling groove ring 18, cooling liquid inlet 19, cooling liquid outlet 20, cooling liquid channel 21, circular time grid signal line interface 22, direct drive motor power line interface 23. DETAILED DESCRIPTION

[0021] In the following description, a large number of specific details are given to provide a more thorough understanding of the present application. However, it is apparent to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, some technical features known to the art are not described in order not to obscure the present application.

[0022] As shown in Figure 1 and Figure 4 , a direct drive rotating mechanism of a tool grinder with positive pressure blowing function, comprising a main shaft 2, the main shaft 2 is rotatably installed in the rotating mechanism body 1, the direct drive motor rotor 4 is sleeved on the main shaft 2, the direct drive motor stator 3 is arranged in the rotating mechanism body 1, the front cover 5 is arranged at one end of the rotating mechanism body 1, the rotating disc surface 6 is arranged at one end of the main shaft 2, the first sealing ring 7 and the positive pressure blowing gap 8 are arranged between the rotating disc surface 6 and the front cover 5, the positive pressure blowing port 9 is arranged on the rotating mechanism body 1, and the positive pressure blowing port 9 is communicated with the positive pressure blowing gap 8 through the positive pressure blowing channel 10 arranged in the rotating mechanism body 1.

[0023] Among them, the flange surface at the straight-through rotating disc surface is positively pressure blown, replacing the original rotating oil seal technology, specifically, the gas pressure source is connected to the positive pressure blowing inlet, the airflow enters the positive pressure blowing gap through the positive pressure blowing channel to form a positive pressure blowing sealing system between the rotating disc surface and the front cover, effectively preventing external cutting fluid or other impurities from entering the interior of the direct drive rotating mechanism body, long-term use without wear, effectively protecting the bearing and increasing the service life.

[0024] The application also comprises a circular time grid rotor 11 mounted on the main shaft 2, a circular time grid stator 12 mounted on the rotating mechanism body 1, the circular time grid rotor 11 and the circular time grid stator 12 being used in cooperation, the circular time grid rotor 11 being installed on a rotor support sleeve 111 through a rotor fixing sleeve 13, and the rotor support sleeve 111 being installed on the main shaft 2. The circular time grid stator 12 is installed on the rotating mechanism body 1 through a stator fixing ring 14. The existing feedback device adopts the mode of a grating ruler, which can effectively ensure the precision but greatly increases the use cost. The position feedback device of the application adopts the circular time grid mode to replace the original annular grating ruler. The use of the circular time grid can keep high precision while greatly reducing the overall cost of the direct drive rotating mechanism. The use of the circular time grid can reduce the cost for the customer while improving the stability of the equipment. After long-term use, the direct drive rotating mechanism is more stable in rotation precision, dynamic performance, noise and other performances.

[0025] The main shaft 2 is sleeved with an axial pre-pressing bearing 15 at one end, and the axial pre-pressing bearing 15 is installed between the main shaft 2 and the rotating mechanism body 1. In order to solve the problems of high loss, vibration and poor stability of the tool grinder direct drive rotating mechanism after long-term use, thereby affecting the poor tool surface roughness and low precision. The existing direct drive rotating mechanism bearing adopts one angular contact bearing in front and one angular contact bearing in back, and a locking nut and a stop nut are locked at the tail end of the main shaft for pre-pressing locking. After long-term use, the nut will be slightly loose, and the main shaft will jump out of tolerance, which cannot meet the high precision requirement. The axial pre-pressing bearing of the application is an integrated structure, which is directly fixed on the mechanism body and will not lose the pre-pressing after long-term use. The pre-pressing force will not be loose after being fixed by a screw, and the axial pre-pressing bearing can bear high axial load and cutting force, so that the in-hole hole and end face runout of the rotating disc can be controlled within 1 microns.

[0026] The rotating mechanism body 1 is provided with a rear cover 16 at the other end, and a second sealing ring 17 is arranged between the rear cover 16 and the mover fixing sleeve 13. The second sealing ring 17 and the first sealing ring 7 are TC oil seals.

[0027] A plurality of cooling groove rings 18 are arranged on the outer wall of the direct drive motor stator 3. The rotating mechanism body 1 is provided with a cooling liquid inlet 19 and a cooling liquid outlet 20, and the cooling liquid inlet 19 and the cooling liquid outlet 20 are in communication with the cooling groove rings 18 through a cooling liquid channel 21 arranged in the rotating mechanism body 1. Adjacent cooling groove rings 18 are in communication with each other. The cooling liquid inlet 19, the cooling liquid channel 21, the cooling groove ring 18 and the cooling liquid outlet 20 form a circulating cooling system for the direct drive motor stator and the direct drive motor mover. The natural cooling direct drive motor is replaced by oil cooling, so that the performance output of the motor is stable.

[0028] The rotating mechanism body 1 is provided with a circular time grid signal line interface 22 and a direct drive motor power line interface 23. The circular time grid signal line interface and the direct drive motor power line interface are welded at the tail of the direct drive rotating mechanism body, and European oil-resistant connectors are used to effectively transmit the signals of the circular time grid and the power of the direct drive motor.

[0029] Working process and innovation points:

[0030] The principle and advantages of the positive pressure blowing sealing system, the positive pressure blowing sealing system is a key design of the direct drive rotating mechanism of the tool grinder. Traditionally, rotating oil seals are used to prevent external contaminants from entering the interior of the equipment, but this sealing method may wear out or fail over time. In contrast, the new positive pressure blowing technology achieves sealing by introducing a controlled airflow environment between the rotating disc surface 6 and the front cover 5.

[0031] Specifically, compressed air enters from the positive pressure blowing port 9 on the rotating mechanism body 1 and passes through the internal positive pressure blowing channel 10 to the positive pressure blowing gap 8. Because the pressure in this gap is always higher than the pressure of the external environment, it can effectively prevent cutting fluid, dust and other tiny particles from entering the interior of the rotating mechanism. In addition, because there is no physical contact, there is no wear and tear problem, thereby prolonging the service life of the equipment and reducing the maintenance requirements. At the same time, this way also avoids the risk of leakage due to the aging of the oil seal, ensuring the cleanliness of the working area.

[0032] Design concept of efficient cooling circulation, in order to ensure that the direct drive motor does not overheat during high load operation, affecting its performance and service life, the rotating mechanism is designed with a set of efficient cooling system. Traditional natural cooling methods often fail to meet the needs of modern high-performance motors, especially under conditions of long-term continuous operation. The cooling scheme here uses a liquid cooling method, that is, by introducing cooling liquid to take away the heat generated by the motor.

[0033] The cooling liquid is input by the cooling liquid inlet 19 on the rotating mechanism body, and then flows into a series of carefully arranged cooling groove rings 18, which are distributed around the outer wall of the direct drive motor stator 3. The cooling liquid absorbs heat during the flow process, and then is discharged through the cooling liquid outlet 20. It is worth noting that the adjacent cooling groove rings are interconnected, which helps to form a more uniform temperature distribution and improve the cooling efficiency. The design of the entire cooling circuit not only improves the working stability of the motor, but also enhances the reliability and durability of the system.

[0034] Precision pre-press bearing structure and its role, in the field of machining, the precision of the spindle is crucial to the quality of the final product. For this reason, the direct drive rotary mechanism has been specially designed with a new type of pre-press bearing system. The traditional pre-press method usually relies on two angular contact bearings in front and back plus a locking nut to fix it, however, this method is easily affected by time factors, once loosened, it will cause the spindle to jump out of tolerance, and then affect the machining precision.

[0035] The new type of shaft diameter pre-press bearing 15 adopts an integrated structure, which is directly installed between the rotary mechanism body 1 and the spindle 2. It is fixed by screws, so that the pre-press force remains constant throughout the use cycle, and it can maintain a stable pre-press state even under large axial and radial loads. In this way, whether in static or dynamic conditions, the runout of the rotary disc hole and end face can be controlled within a very strict range, for example, within 1 micron. Such high precision performance can significantly improve the tool surface roughness and flatness, meeting the strict requirements of high-end manufacturing industries.

[0036] Application significance of circular time grid position feedback device, position feedback device is an indispensable part of numerical control machine tool, which is responsible for real-time monitoring of spindle position information and providing feedback to the control system for accurate motion control. In the past, such devices have been in the form of grating rulers, although they can provide very high measurement accuracy, but the cost is high and the installation is complex. This application introduces a solution that uses a circular time grid rotor 11 and a circular time grid stator 12 to replace the traditional ring-shaped grating ruler.

[0037] The working principle of the circular time grid is based on time interval measurement conversion to angular position, which can greatly reduce production costs while maintaining the same or even higher accuracy. Moreover, since it does not require complex optical components, it is more durable and less affected by external environmental changes. More importantly, the circular time grid signal line interface 22 and the direct drive motor power line interface 23 both use European oil-resistant connectors to ensure the safety and reliability of electrical connections. This combination not only simplifies the installation process but also improves overall performance, providing users with a higher cost-effective choice.

[0038] In summary, this tool grinder direct drive rotary mechanism with positive pressure blowing function combines multiple advanced technologies, optimizing and improving sealing, cooling, pre-press bearing, and position feedback, aiming to provide an efficient, stable, long-lasting, and cost-effective solution. It is not only suitable for various precision machining occasions, but also reduces user operating costs and improves market competitiveness through technological innovation. In the future, with the continuous progress of technology, we have reason to believe that such direct drive rotary mechanisms will be widely used in more fields and bring more possibilities to the manufacturing industry.

[0039] The preferred embodiments of the present application are described in detail above with reference to the drawings, but the present application is not limited to the specific details of the above-described embodiments, and various equivalent transformations of the technical solutions of the present application can be made within the technical concept of the present application, and these equivalent transformations all belong to the protection scope of the present application.

Claims

1. A positive pressure blowing function cutter grinder direct drive rotary mechanism, comprising a main shaft (2) which is rotatably installed inside a rotary mechanism body (1), a direct drive motor rotor (4) is sleeved on the main shaft (2), a direct drive motor stator (3) is arranged inside the rotary mechanism body (1), a front cover (5) is arranged at one end of the rotary mechanism body (1), and a rotary disc surface (6) is arranged at one end of the main shaft (2), characterized in that, The first sealing ring (7) and the positive pressure blowing gap (8) are arranged between the rotating disc surface (6) and the front cover (5), the positive pressure blowing port (9) is arranged on the rotating mechanism body (1), and the positive pressure blowing port (9) is communicated with the positive pressure blowing gap (8) through the positive pressure blowing channel (10) arranged in the rotating mechanism body (1).

2. A positive pressure air jet functional tool grinder direct drive rotary mechanism according to claim 1, characterized in that, The circular time grid rotor (11) is installed on the main shaft (2), the circular time grid stator (12) is installed on the rotating mechanism body (1), and the circular time grid rotor (11) is used in cooperation with the circular time grid stator (12).

3. A positive pressure air jet functional tool grinder direct drive rotary mechanism according to claim 2, characterized in that, The circular time grid rotor (11) is installed on the rotor support sleeve (111) through the rotor fixing sleeve (13), and the rotor support sleeve (111) is installed on the main shaft (2).

4. A positive pressure air jet functional tool grinder direct drive rotary mechanism according to claim 2, characterized in that, The circular time grid stator (12) is installed on the rotating mechanism body (1) through the stator fixing ring (14).

5. A positive pressure air jet functional tool grinder direct drive rotary mechanism according to claim 1, characterized in that, The shaft diameter pre-pressing bearing (15) is sleeved at one end of the main shaft (2), and the shaft diameter pre-pressing bearing (15) is installed between the main shaft (2) and the rotating mechanism body (1).

6. A positive pressure air jet functional tool grinder direct drive rotary mechanism according to claim 4, characterized in that, The rear cover (16) is arranged at the other end of the rotating mechanism body (1), and the second sealing ring (17) is arranged between the rear cover (16) and the mover fixing sleeve (13).

7. A positive pressure air jet functional tool grinder direct drive rotary mechanism according to claim 1, wherein, The outer wall of the direct drive motor stator (3) is provided with a plurality of cooling groove rings (18).

8. A positive pressure air jet functional tool grinder direct drive rotary mechanism according to claim 7, characterized in that, The rotating mechanism body (1) is provided with a cooling liquid inlet (19) and a cooling liquid outlet (20), and the cooling liquid inlet (19) and the cooling liquid outlet (20) are communicated with the cooling groove ring (18) through the cooling liquid channel (21) arranged in the rotating mechanism body (1).

9. A positive pressure air jet functional tool grinder direct drive rotary mechanism according to claim 7, characterized in that, The adjacent cooling groove rings (18) are communicated with each other.

10. The positive pressure air jet functional tool grinder direct drive rotary mechanism according to claim 1, wherein, The rotating mechanism body (1) is provided with a circular time grid signal line interface (22) and a direct drive motor power line interface (23).

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