A high-precision gear cutting machine cutter electric spindle structure

Abstract

The present application relates to the technical field of machine tool electric spindle, and particularly relates to a high-precision gear cutting machine tool electric spindle structure, which comprises an electric spindle, the electric spindle is provided with a tool changing module, the tool changing module is used for mounting a tool, the electric spindle is provided with a displacement sensor for detecting the displacement of the tool, and the displacement sensor is electrically connected with an amplifier; the high-precision gear cutting machine tool electric spindle structure further comprises an air pump, an air outlet of the air pump faces the tool, and the air pump is used for generating high-pressure airflow towards the tool; the high-precision gear cutting machine tool electric spindle structure further comprises a controller, the controller is used for driving the tool to rotate and controlling the air pump to generate high-pressure airflow in the opposite direction of the tool rotation after the tool is mounted, the controller is used for acquiring displacement data detected by the displacement sensor and judging whether the tool installation is abnormal or not. The electric spindle structure can detect the installation state of the gear cutting tool after switching the gear cutting tool, and ensures that the gear cutting tool is installed in a state meeting the gear cutting processing requirements before gear cutting processing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of machine tool electric spindle, and particularly relates to a high-precision gear cutting machine tool electric spindle structure. BACKGROUND

[0002] Gear cutting processing technology is a new generation of generating-forming composite processing method proposed in the 21st century to solve the non-through, no retreat groove, thin-walled or complex internal helical gear structure which cannot be completed by traditional gear processing (gear hobbing, gear shaping, gear broaching, etc.). Its principle is: based on the meshing theory of crossed-axis helical gears, the tool and the workpiece axis have an axial angle (determined by the helix angle), through the three-axis linkage of tool rotation, workpiece rotation and axial feed, the tooth surface is formed point by point.

[0003] The tool of the gear cutting machine is driven to rotate by the electric spindle, such as a gear cutting machine tool electric spindle disclosed in CN102328100A. The electric spindle directly converts electrical energy into high-speed, high-precision cutting motion, replacing the traditional mechanical spindle belt / gear transmission, and realizing high-speed, high-precision, high-efficiency and low-vibration gear cutting. The electric spindle mainly consists of a shaft and a rotor assembly, a bearing support system, a cooling system, a tool interface and a tool changing mechanism. Since gear cutting is based on gear meshing theory, different gear cutting tools need to be replaced to match different gears, and the replacement frequency of gear cutting tools is higher than that of other machine tools.

[0004] The existing electric spindle can realize efficient replacement of gear cutting tools through the tool interface and the tool changing mechanism, and continuously monitor the state of the gear cutting tool during gear cutting processing through the vibration sensor, such as a numerical control machine tool spindle motor operation monitoring method disclosed in CN112381388A. However, there is a lack of detection of the installation state of the non-processing gear cutting tool after replacement. During the replacement of the gear cutting tool, chips or impurities are easy to enter the tool interface or the tool changing mechanism with the tool holder, resulting in poor installation state of the gear cutting tool, and further affecting the gear cutting precision. SUMMARY

[0005] To solve the above problems, the present application provides a high-precision gear cutting machine tool electric spindle structure, which can detect the installation state of the gear cutting tool and ensure that the gear cutting tool meets the gear cutting processing requirements after being installed on the electric spindle.

[0006] In order to achieve the above purpose, the technical scheme of the present application is as follows: a high-precision gear cutting machine tool electric spindle structure, comprising an electric spindle, the electric spindle is provided with a tool changing module, the tool changing module is used for installing a tool, a displacement sensor for detecting the displacement of the tool is arranged on the electric spindle, and the displacement sensor is electrically connected with an amplifier.

[0007] Further comprising an air pump, the air outlet of the air pump faces the side where the tool is installed, and the air pump is used for generating high-pressure airflow towards the tool.

[0008] The controller is configured to drive the tool to rotate and control the air pump to generate high-pressure airflow in the opposite direction of the tool rotation after the tool is installed.

[0009] The above scheme has the following beneficial effects:

[0010] In the scheme, the tool changing module is used to install the tooth scraping tool, and the installed tooth scraping tool is used for tooth scraping processing. It is necessary to ensure that the installation state of the tooth scraping tool meets the tooth scraping processing requirements. When the tool installation state is not good, the tool will vibrate during processing, resulting in poor surface processing quality of the workpiece, fish scale-like vibration lines, and also causing the tool to wear out and the life of the electric spindle to decrease.

[0011] After the user installs the tooth scraping tool, the air pump sprays high-pressure airflow towards the tool, and the electric spindle drives the tooth scraping tool to idle. The direction of the airflow is opposite to the rotation direction of the tool, simulating the resistance of the tool during processing. The displacement of the tooth scraping tool is detected by the displacement sensor. Since the resistance effect simulated by the airflow is limited, the displacement of the tooth scraping tool is small, so the displacement sensor for detecting the vibration displacement is connected to an amplifier to amplify the displacement data of the tooth scraping tool during airflow simulation. The installation state of the tool is evaluated based on the displacement data.

[0012] Compared with the prior art, the installation state of the tooth scraping tool in the non-processing state after replacement can be effectively detected to ensure that the tooth scraping tool is installed in a state that meets the tooth scraping processing requirements before tooth scraping processing is performed. The tooth scraping processing precision is ensured, and the wear of the tooth scraping tool and the electric spindle is reduced.

[0013] Further, the tool changing module includes a taper sleeve, a pull sleeve sleeved in the taper sleeve, a first driving member for driving the pull sleeve to move, a plurality of through holes are arranged on the pull sleeve, a ball for clamping the pull pin of the tool is arranged in the through hole, the ball can float in the through hole, and an annular taper surface for the ball to pop out to the outside of the pull sleeve is further arranged in the taper sleeve.

[0014] Beneficial effects: the user can install the pull pin of the tooth scraping tool in the tool changing module. When the tooth scraping tool is installed, the ball is close to the annular taper surface, the pull pin of the tooth scraping tool can directly enter the pull sleeve, the pull sleeve is driven by the first driving member to move axially away from the annular taper surface, the pull sleeve drives the ball to disengage from the annular taper surface, and the ball slides in the through hole and clamps into the pull pin groove, thereby fixing the tool. The taper surface of the taper sleeve also matches the taper surface of the tool, improving the installation precision. When the tool needs to be disassembled, the pull sleeve is driven by the first driving member to move axially close to the annular taper surface, the ball slides in the through hole and disengages from the pull pin groove close to the annular taper surface, and the pull pin of the tool is not clamped by the ball, so that the tool can be disassembled.

[0015] Further, the electric spindle is provided with a rotating shaft, the electric spindle is provided with a rotor and a stator for driving the rotating shaft to rotate, the rotor is sleeved on the rotating shaft, and the taper sleeve is coaxially and fixedly connected with the rotating shaft.

[0016] Beneficial effects: the electric spindle drives the rotating shaft to rotate through the rotor and the stator, and then drives the taper sleeve and the tool to rotate to perform tooth cutting.

[0017] Further, the first driving member includes a piston structure driven by gas, the piston structure is used for driving the pull sleeve to move axially, and the pull sleeve is coaxially and fixedly connected with the rotating shaft through the tooth spring.

[0018] Beneficial effects: when the tool needs to be installed, the gas is injected to drive the piston structure, so that the pull sleeve moves towards the annular taper surface, and the ball is close to the annular taper surface. After installation, the gas in the piston structure is extracted, the tooth spring drives the pull sleeve to move away from the annular taper surface, the tool is fixed, and due to the large retraction force of the tooth spring, the tool is tightly pulled during machining, reducing the probability of tool loosening.

[0019] Further, the electric spindle is provided with a housing, the housing is provided with a first air pipe, and the first air pipe is in communication with the piston structure.

[0020] Beneficial effects: the piston structure can be injected by air through the first air pipe on the housing for driving the piston structure to operate.

[0021] Further, the taper sleeve is provided with an air inlet pipeline, the housing is provided with a second air pipe, and the second air pipe is in communication with the air inlet pipeline.

[0022] Beneficial effects: during switching of the tool, impurities may enter the taper sleeve, and then the installation state of the tool is poor. Therefore, the air inlet pipeline is arranged on the taper sleeve, air is supplied to the air inlet pipeline through the second air pipe, and the impurities in the taper sleeve are removed.

[0023] Further, the housing is provided with a bearing set for reducing the rotating resistance of the taper sleeve, the bearing set is provided with an air lubrication passage, the housing is provided with a third air pipe, and the third air pipe is in communication with the air lubrication passage.

[0024] Beneficial effects: the bearing set can reduce the rotating resistance of the taper sleeve, and during rotation of the taper sleeve, air lubrication is adopted as lubrication of the bearing set, and air is supplied through the third air pipe. In addition, valves are arranged in the first air pipe, the second air pipe and the third air pipe to avoid the influence of impurities on operation.

[0025] Further, the air pump is provided with a second driving member, the second driving member is used for driving the air pump to move, and the air pump is used for supplying air to the first air pipe, the second air pipe and the third air pipe after moving.

[0026] Beneficial effects: Because the taper sleeve air inlet is installed before the tool, the piston structure air inlet is installed or disassembled during the tool, the air flow simulation detection is installed after the tool, and the bearing set lubrication is in the process of machining the workpiece, the air pump can be driven by the second driving member to pump air for different functions at different stages.

[0027] Further, the air outlet of the air pump is provided with a telescopic pipe, which is used to cooperate with the first air pipe, the second air pipe and the third air pipe through telescoping.

[0028] Beneficial effects: The telescopic pipe can cooperate with the first air pipe, the second air pipe and the third air pipe through telescoping, improving the air intake effect.

[0029] Further, the displacement sensor is an eddy current displacement sensor, and the probe of the eddy current displacement sensor is directed towards the tool shaft of the tool;

[0030] The controller is used to obtain the displacement data detected by the eddy current displacement sensor; at any moment in the tool acceleration stage, if there is a displacement mutation in the displacement data, and the displacement is greater than the displacement threshold, it is judged that the tool installation is abnormal; in the uniform speed stage of the tool, if the displacement greater than the displacement threshold appears periodically in the displacement data, it is judged that the tool installation is abnormal.

[0031] Beneficial effects: Since the tool is rotating, it is difficult to measure the displacement of the tool by contact detection, and the eddy current displacement sensor measures the displacement of the tool in a non-contact manner, which can better detect the displacement data of the tool.

[0032] For the abnormal installation state of the tool, on the one hand, the tool is not installed in place (manually installed out of place or impurities cause installation out of place), for the case that the tool is not installed in place, in the tool self-inhibition state starting to accelerate rotation stage, the tool shaft will have one or more displacement mutations until the tool shaft is clamped tightly; although the tool shaft is clamped tightly, its actual installation state is not proper, if the tooth scraping machining is directly carried out in this installation state, the tooth scraping tool may suddenly displace during the machining process, resulting in termination of tooth scraping machining or damage to the tool or workpiece. Therefore, displacement mutation detection is carried out in the tool acceleration stage, which can obtain the installation out of place condition of the tool to avoid subsequent tooth scraping machining failure and damage to the tool or workpiece. On the other hand, the tool is installed off-center, for the case that the tool is installed off-center, in the uniform speed rotation stage of the tool, the axis of the tool shaft is elliptical, the tool shaft periodically approaches and moves away from the probe of the eddy current displacement sensor, generating periodic displacement data; thereby, before tooth scraping machining, it is judged whether the tool exists installation off-center condition based on the displacement data, to ensure that the tooth scraping tool installation state meets the requirements before tooth scraping machining.

[0033] Additional aspects and advantages of the application will be made apparent by the following description. BRIEF DESCRIPTION OF DRAWINGS

[0034] Fig. 1 The electric spindle structure schematic diagram of the high-precision gear cutting machine tool electric spindle structure embodiment of the present application;

[0035] Fig. 2 The air pump schematic diagram of the high-precision gear cutting machine tool electric spindle structure embodiment of the present application;

[0036] Fig. 3 The air pump function schematic diagram of the high-precision gear cutting machine tool electric spindle structure embodiment of the present application.

[0037] The reference signs in the drawings of the specification include: 1, electric spindle; 2, displacement sensor; 3, amplifier; 4, air pump; 5, cone sleeve; 6, pull sleeve; 7, first driving piece; 8, through hole; 9, ball; 10, annular taper surface; 11, rotating shaft; 12, rotor; 13, stator; 14, piston structure; 15, tooth pulling spring; 16, first air pipe; 17, air inlet pipeline; 18, second air pipe; 19, bearing set; 20, third air pipe; 21, air lubrication passage; 22, second driving piece; 23, telescopic pipe; 24, tool; 25, pull pin. DETAILED DESCRIPTION

[0038] The technical solutions of the present application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0039] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] The following detailed description illustrates the specific implementation methods:

[0042] Examples, such as Figs. 1-3 The diagram shows a high-precision gear-removing machine tool electric spindle structure, comprising an electric spindle 1 with a housing. Inside the housing is a tool changing module for mounting a tool 24. Specifically, the tool changing module includes a tapered sleeve 5 and a pull sleeve 6 fitted inside the tapered sleeve 5. A bearing assembly 19 is provided between the tapered sleeve 5 and the housing to reduce rotational resistance between them. A rotating shaft 11 is also provided inside the housing of the electric spindle 1. In some embodiments, a bearing assembly 19 is also provided between the rotating shaft 11 and the housing to further reduce rotational resistance. A rotor 12 is fitted onto the rotating shaft 11, and a stator 13 is positioned inside the housing corresponding to the rotor 12. The rotating shaft 11 is driven to rotate via the stator 13 and the rotor 12.

[0043] The tapered sleeve 5 is coaxially and fixedly connected to the rotating shaft 11, and the pull sleeve 6 is coaxially and fixedly connected to the rotating shaft 11 via a coiled spring 15. Specifically, the pull sleeve 6 is coaxially fixed to the piston shaft of the coiled spring 15, and the other end of the piston shaft of the coiled spring 15 is coaxially fixed to the rotating shaft 11. When the stator 13 and the rotor 12 drive the rotating shaft 11 to rotate, the rotating shaft 11 drives the tapered sleeve 5 and the pull sleeve 6 to rotate synchronously. A first driving member 7 for driving the pull sleeve 6 to move is provided in the middle of the housing. The first driving member 7 includes a pneumatic piston structure 14. The piston structure 14 is a pneumatic piston structure, which is a prior art technology that controls extension and contraction by air, and will not be described in detail here. The piston structure 14 is used to drive the pull sleeve 6 to move axially.

[0044] The pull sleeve 6 has several through holes 8, and ball bearings 9 are installed in the through holes 8. The ball bearings 9 float in the through holes 8. The ball bearings 9 are used to squeeze and hold the pull stud 25 of the tool 24. The inner side wall of the tapered sleeve 5 has an annular conical surface 10, which allows the ball bearings 9 to float away from the center of the pull sleeve 6.

[0045] The outer casing has a first air duct 16, which is connected to the piston structure 14. An air inlet duct 17 is located inside the side wall of the cone sleeve 5, and a second air duct 18 is located on the outer casing, connected to the air inlet duct 17. The bearing assembly 19 has an air lubrication passage 21, and a third air duct 20 is located on the outer casing, connected to the air lubrication passage 21. Each of the first air duct 16, second air duct 18, and third air duct 20 is equipped with a solenoid valve, which is electrically connected to the controller.

[0046] The electric spindle 1 is provided with a displacement sensor 2 for detecting the displacement of the tool 24 at one end close to the tool changing module, the displacement sensor 2 is electrically connected with an amplifier 3, and the amplifier 3 is electrically connected with a controller. A second driving member 22 is arranged on the side wall of the shell, and in the embodiment, the second driving member 22 is a screw pair + servo motor structure, a gas pump 4 is fixedly connected to the displacement seat of the screw pair, the air outlet of the gas pump 4 faces the side where the tool 24 is installed, and a telescopic pipe 23 is arranged at the air outlet of the gas pump 4. In the embodiment, the telescopic pipe 23 is realized by an electric cylinder. The servo motor and the electric cylinder are electrically connected with the controller.

[0047] The controller is used for controlling the servo motor to operate, so that the gas pump 4 can be moved; the controller is used for controlling the electric cylinder to operate, so that the telescopic pipe 23 can be telescoped, the displacement of the gas pump 4 can be matched with the positions of the first air pipe 16, the second air pipe 18 and the third air pipe 20, and the telescopic pipe 23 can be matched with the first air pipe 16, the second air pipe 18 and the third air pipe 20, so that the gas supply to the first air pipe 16, the second air pipe 18 and the third air pipe 20 can be realized.

[0048] When the gas pump 4 is matched with the first air pipe 16 (tool 24 switching process), the gas pump 4 is used for telescoping the charge-discharge gas control piston structure 14, so that the pull sleeve 6 is moved.

[0049] When the gas pump 4 is matched with the second air pipe 18 (tool 24 installation process), the gas pump 4 is used for supplying gas to the middle conical region of the conical sleeve 5, so as to assist in removing impurities in the conical sleeve.

[0050] When the gas pump 4 is matched with the third air pipe 20 (tool 24 formal tooth operation process), the gas pump 4 is used for supplying gas to the bearing set 19, so as to assist in lubricating the bearing set 19.

[0051] When the gas pump 4 is not matched with the first air pipe 16, the second air pipe 18 and the third air pipe 20, the gas pump 4 is used for generating high-pressure gas flow towards the tool 24. After the installation of the tool 24 is completed, the controller drives the tool 24 to rotate and controls the gas pump 4 to generate high-pressure gas flow in the opposite direction of the rotation direction of the tool 24, and the controller is used for acquiring the displacement data detected by the displacement sensor 2, and judging whether the installation of the tool 24 is abnormal. In some embodiments, the controller is actively informed by the user that the installation of the tool 24 is completed, and in other embodiments, a pressure sensor is arranged in the pull sleeve 6, and the pressure sensor is electrically connected with the controller, and when the pressure sensor detects a preset pressure value, the controller actively judges that the installation of the tool 24 is completed.

[0052] Specifically, the displacement sensor 2 of the embodiment is an eddy current displacement sensor 2, and the probe of the eddy current displacement sensor 2 faces the tool shaft of the tool 24. The controller is used for acquiring the displacement data detected by the eddy current displacement sensor 2, and executing the following detection strategies:

[0053] If there is a displacement mutation in the displacement data and the displacement is greater than the displacement threshold at any time during the acceleration stage of the tool 24, it is determined that the tool 24 is abnormally installed. This detection strategy is aimed at the tool 24 being not installed in place. In the case of the tool 24 being not installed in place, a displacement mutation will occur during the acceleration stage of the tool 24. Whether a displacement mutation occurs during the acceleration stage of the tool 24 is extracted from the displacement data to determine whether the tool 24 is not installed in place.

[0054] If there is a displacement greater than the displacement threshold periodically appearing in the displacement data during the uniform speed stage of the tool 24, it is determined that the tool 24 is abnormally installed. This detection strategy is aimed at the tool 24 being not installed on the same axis. In the case of the tool 24 being not installed on the same axis, the axis center trajectory of the tool 24 axis is elliptical, and the tool 24 axis appears to be vibrating. Whether a displacement greater than the displacement threshold periodically appears during the uniform speed stage of the tool 24 is extracted from the displacement data to determine whether the tool 24 is not installed on the same axis.

[0055] After the installation of the tool 24 is completed, the tool 24 will be driven to idle for installation state detection. In order to avoid the tool 24 from suddenly operating and injuring the user, a prompt device (such as a buzzer, an indicator light, etc.) can be set in signal connection with the controller and send a prompt through the prompt device before driving the tool 24.

[0056] In some embodiments, the electric spindle structure of the present application is used in cooperation with an automatic tool changer. The automatic tool changer is the same as the existing conventional automatic tool changer of a numerical control machine tool, and the tool 24 is removed by moving up and down and cooperating with the tool changing module to loosen and change the tool.

[0057] When the controller detects that the tool 24 is abnormally installed, the automatic tool changer can be controlled to cooperate with the tool changing module to remove the tool 24, and the air pump 4 is controlled to be in communication with the second air pipe 18 to blow off the impurities in the taper sleeve 5 through the air pump 4. After the blowing operation is completed, the automatic tool changer is controlled to install the tool 24 again, and the tool 24 installed again is detected again. Until the installation state of the tool 24 meets the requirements, the tool 24 is driven by the electric spindle to perform gear tooth machining.

[0058] Obviously, the above embodiments are merely examples for clear illustration, and are not limitations on the embodiments. Based on the above description, other different forms of changes or variations can be made by those of ordinary skill in the art. Here, all the embodiments need not and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A high-precision gear cutting machine tool electric spindle structure, comprising an electric spindle (1), the electric spindle (1) is provided with a tool changing module, the tool changing module is used for installing a tool (24), characterized in that, The electric spindle (1) is provided with a displacement sensor (2) for detecting displacement of a tool (24), and the displacement sensor (2) is electrically connected with an amplifier (3); The tool changing module comprises a taper sleeve (5), a pull sleeve (6) sleeved in the taper sleeve (5), and a first driving member (7) for driving the pull sleeve (6) to move; the first driving member (7) comprises a piston structure (14) driven by gas, and the piston structure (14) is used for driving the pull sleeve (6) to move axially; The electric spindle (1) is provided with a shell, the shell is provided with a first air pipe (16), the first air pipe (16) is communicated with the piston structure (14); the taper sleeve (5) is provided with an air inlet pipeline (17), the shell is provided with a second air pipe (18), the second air pipe (18) is communicated with the air inlet pipeline (17); the shell is provided with a bearing set (19) for reducing the rotational resistance of the taper sleeve (5), the bearing set (19) is provided with an air lubrication passage (21), the shell is provided with a third air pipe (20), the third air pipe (20) is communicated with the air lubrication passage (21); Further comprising a gas pump (4), an air outlet of the gas pump (4) faces a side where the tool (24) is installed, and the gas pump (4) is used for generating high-pressure gas flow towards the tool (24); the gas pump (4) is provided with a second driving member (22), the second driving member (22) is used for driving the gas pump (4) to move, and the gas pump (4) is used for supplying air to the first air pipe (16), the second air pipe (18) and the third air pipe (20) after moving; Further comprising a controller, the controller is used for driving the tool (24) to rotate and controlling the gas pump (4) to generate high-pressure gas flow opposite to a rotating direction of the tool (24) after installation of the tool (24) is completed, and the controller is used for acquiring displacement data detected by the displacement sensor (2) and judging whether installation of the tool (24) is abnormal; The displacement sensor (2) is an eddy current displacement sensor (2), a probe of the eddy current displacement sensor (2) faces a tool shaft of the tool (24); The controller is used for acquiring displacement data detected by the eddy current displacement sensor (2); at any moment in an acceleration stage of the tool (24), if there is displacement mutation in the displacement data and the displacement is greater than a displacement threshold value, it is judged that the installation of the tool (24) is abnormal; in a uniform speed stage of the tool (24), if displacement greater than the displacement threshold value appears periodically in the displacement data, it is judged that the installation of the tool (24) is abnormal.

2. The high-precision gear cutting machine tool electric spindle structure according to claim 1, characterized in that, A plurality of through holes (8) are arranged on the pull sleeve (6), a ball (9) for clamping a pull pin (25) of the tool (24) is arranged in each through hole (8), the ball (9) can float in the through hole (8), and an annular taper surface (10) is arranged in the taper sleeve (5), the annular taper surface (10) is used for allowing the ball (9) to float outward of the pull sleeve (6).

3. The high-precision gear cutting machine tool electric spindle structure according to claim 2, characterized in that, The electric spindle (1) is provided with a rotating shaft (11), the electric spindle (1) is provided with a rotor (12) and a stator (13) for driving the rotating shaft (11) to rotate, the rotor (12) is sleeved on the rotating shaft (11), and the taper sleeve (5) is fixedly connected with the rotating shaft (11) coaxially.

4. The high-precision gear cutting machine tool electric spindle structure according to claim 3, characterized in that, The pull sleeve (6) is fixedly connected with the rotating shaft (11) coaxially through a torsion spring (15).

5. The high-precision gear cutting machine tool electric spindle structure according to claim 4, characterized in that, The air outlet of the air pump (4) is provided with an extension tube (23), which is used to cooperate with the first air pipe (16), the second air pipe (18) and the third air pipe (20) through extension and retraction.

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