Electric spindle and numerical control machine tool applying same

Abstract

The utility model discloses an electric spindle and a numerical control machine tool applying the same, the electric spindle comprises a compression ring assembly, a shaft core, a bearing, a bearing seat and a shaft sleeve, the compression ring assembly is sleeved outside the shaft core, the compression ring assembly and the shaft core are in threaded connection, the bearing is sleeved on the shaft core, and the end face of the bearing abuts against the end face of the compression ring assembly. The bearing seat is arranged outside the pressing ring assembly and the bearing in a sleeving mode and connected with the shaft sleeve arranged on the shaft core in a sleeving mode. According to the utility model, the compression ring assembly and the shaft core are connected into a tight whole through threaded connection, so that cutting fluid cannot permeate; certainly, cutting fluid is prevented from entering, the interior of the motorized spindle can be effectively sealed through threaded connection, invasion of other media such as external liquid, gas and dust is prevented, and it is guaranteed that the working environment of the motorized spindle meets the requirement. The electric main shaft provided by the utility model adopts excellent sealing performance of threaded connection, can effectively prevent cutting fluid from entering the main shaft cavity, and improves the safety and reliability of the electric main shaft.

Description

Technical Field

[0001] The utility model belongs to the technical field of numerical control machine tools, and relates to an electric spindle and a numerical control machine tool applying the same. Background Art

[0002] The electric spindle is a new technology that integrates the machine tool spindle and the spindle motor in the field of numerical control machine tools. Compared with the traditional mechanical spindle, the electric spindle adopts an integrated shaft core and rotor, replacing the traditional belt and gear transmission methods of the mechanical spindle, greatly improving the performance of the spindle under high-speed operation, and being more integrated and precise. In recent years, the field of machining has developed rapidly, and the electric spindle technology, as its core technology, has also made great progress.

[0003] The electric spindle is a precision component. Under high-speed operation, any dust entering the spindle bearing may cause spindle vibration or even seizure of the spindle bearing. Therefore, the sealing performance of the electric spindle determines the accuracy and service life of the electric spindle to a certain extent. In addition, since the motor of the electric spindle is built-in, moisture and dust will deteriorate the insulation of the motor winding or even cause it to fail, resulting in the burning of the motor. Moreover, in the problem of spindle maintenance, 60%-70% of the damage is caused by bearing damage. Except for the problems of the bearing's own service life and accuracy, about 50% is caused by bearing water ingress. Thus, it can be seen that the design of the sealing structure of the electric spindle is crucial.

[0004] The traditional electric spindle is generally sealed by a sealing end cover, and this sealing form has a poor sealing effect; there is also an electric spindle structure in which an outer cover oil seal is provided between the bearing outer cover and the motor rotating shaft, and an inner cover oil seal is provided between the bearing inner cover and the motor rotating shaft. The two sides of the bearing are sealed by the front and rear oil seals. This sealing method is not only inconvenient for assembly, but also has a relatively poor sealing performance. Summary of the Utility Model

[0005] In view of this, the utility model provides an electric spindle and a numerical control machine tool applying the same, which solve the technical problem of poor sealing performance existing in the traditional electric spindle.

[0006] To solve the above problems, according to one aspect of the present application, an embodiment of the utility model provides an electric spindle, which includes a retaining ring assembly, a shaft core, a bearing, a bearing housing, and a bushing. The retaining ring assembly is sleeved outside the shaft core and is threadedly connected thereto. The bearing is sleeved on the shaft core, and the end face of the bearing abuts against the end face of the retaining ring assembly. The bearing housing is sleeved outside the retaining ring assembly and the bearing, and is connected to the bushing sleeved on the shaft core.

[0007] In some embodiments, the outer surface of the shaft core has a first tapered thread, and the inner surface of the pressure ring assembly has a second tapered thread. The first tapered thread cooperates with the second tapered thread to achieve the sealing between the shaft core and the pressure ring assembly.

[0008] In some embodiments, the pressure ring assembly includes an inner pressing spacer ring and an outer pressing spacer ring. The inner pressing spacer ring is disposed inside the outer pressing spacer ring. The end face of the inner pressing spacer ring abuts against the end face of the inner ring of the bearing, and the end face of the outer pressing spacer ring abuts against the end face of the outer ring of the bearing.

[0009] In some embodiments, the outer surface of the inner pressing spacer ring extends outward to form a first serration, and the inner surface of the outer pressing spacer ring extends inward to form a second serration. The first serration cooperates with the second serration to achieve the sealing between the inner pressing spacer ring and the outer pressing spacer ring.

[0010] In some embodiments, the first serration and the second serration are in clearance fit; and / or, the clearance between the first serration and the second serration is 0.1 mm - 0.2 mm.

[0011] In some embodiments, the first serration includes a first inclined surface, a second inclined surface, and a first vertical surface. The first inclined surface and the second inclined surface are arranged opposite to each other up and down, and the first vertical surface is connected between the ends of the first inclined surface and the second inclined surface away from the inner pressing spacer ring.

[0012] and / or the second serration includes a third inclined surface, a fourth inclined surface, and a second vertical surface. The third inclined surface and the fourth inclined surface are arranged opposite to each other up and down, and the second vertical surface is connected between the ends of the third inclined surface and the fourth inclined surface away from the outer pressing spacer ring.

[0013] In some embodiments, the angles between the first inclined surface and the horizontal plane and between the second inclined surface and the horizontal plane are both α, where α satisfies: 30° < α < 60°;

[0014] and / or the angles between the third inclined surface and the horizontal plane and between the fourth inclined surface and the horizontal plane are both β, where β satisfies: 30° < β < 60°.

[0015] In some embodiments, the outer pressing spacer ring includes a first pressing half-ring and a second pressing half-ring. After the first pressing half-ring and the second pressing half-ring are spliced, a cavity capable of accommodating the inner pressing spacer ring is formed.

[0016] In some embodiments, the motorized spindle further includes a sealing end cover. The sealing end cover is sleeved on the shaft core and is connected to the pressure ring assembly and the bearing housing.

[0017] According to another aspect of the present application, an embodiment of the utility model provides a numerical control machine tool, and the numerical control machine tool includes the above-mentioned electric spindle.

[0018] Compared with the prior art, the electric spindle of the utility model has at least the following beneficial effects:

[0019] The electric spindle provided by the utility model includes a retaining ring assembly, a shaft core, bearings, a bearing housing and a bushing. The retaining ring assembly is sleeved outside the shaft core and the two are threadedly connected. The bearings are sleeved on the shaft core and the end faces of the bearings are abutted against the end face of the retaining ring assembly. The bearing housing is sleeved outside the retaining ring assembly and the bearings, and is connected to the bushing sleeved on the shaft core.

[0020] In the utility model, the retaining ring assembly is sleeved outside the shaft core and the two are threadedly connected. The retaining ring assembly and the shaft core are tightly connected by the thread to achieve sealing. Thread sealing is achieved by the connection of two thread surfaces to form a tight sealing structure to prevent the leakage or seepage of cutting fluid. The connection of thread sealing is realized by the principle of mutual rotation and rapid fitting between the thread surfaces. In the utility model, the threaded connection connects the retaining ring assembly and the shaft core into a tight whole, making the cutting fluid unable to penetrate. Of course, in addition to preventing the cutting fluid from entering, the threaded connection can also effectively seal the inside of the electric spindle to prevent the intrusion of other external liquids, gases and dust and other media, ensuring that the working environment of the electric spindle meets the requirements.

[0021] The electric spindle provided by the utility model adopts the excellent sealing performance of threaded connection, which can effectively block the cutting fluid from entering the spindle cavity and improve the safety and reliability of the electric spindle.

[0022] The numerical control machine tool provided by the utility model is designed based on the above-mentioned electric spindle, and its beneficial effects can be referred to the beneficial effects of the above-mentioned electric spindle, which will not be elaborated here one by one.

[0023] The above description is only an overview of the technical solution of the utility model. In order to be able to understand the technical means of the utility model more clearly and implement it according to the content of the description, the following takes the preferred embodiments of the utility model and describes them in detail in conjunction with the drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are some embodiments of the utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1It is an exploded view of an electric spindle provided by an embodiment of the present utility model;

[0026] Figure 2 It is a half-sectional view of an electric spindle provided by an embodiment of the present utility model;

[0027] Figure 3 It is a partial sectional view of an electric spindle provided by an embodiment of the present utility model;

[0028] Figure 4 It is a structural schematic diagram of a pressure ring assembly in an electric spindle provided by an embodiment of the present utility model;

[0029] Figure 5 It is a structural schematic diagram of an outer compression spacer ring in an electric spindle provided by an embodiment of the present utility model;

[0030] Figure 6 It is a sectional view of a pressure ring assembly in an electric spindle provided by an embodiment of the present utility model;

[0031] Figure 7 It is a front view of an inner compression spacer ring in an electric spindle provided by an embodiment of the present utility model;

[0032] Figure 8 It is a top view of an inner compression spacer ring in an electric spindle provided by an embodiment of the present utility model;

[0033] Figure 9 It is a sectional view of a bearing housing in an electric spindle provided by an embodiment of the present utility model;

[0034] Figure 10 It is a sectional view of a shaft core in an electric spindle provided by an embodiment of the present utility model;

[0035] Figure 11 is Figure 10 a partial enlarged view at position A in.

[0036] Wherein:

[0037] 1. Pressure ring assembly; 11. Inner compression spacer ring; 12. Outer compression spacer ring; 13. Second tapered thread; 111. First sawtooth; 121. Second sawtooth; 122. First compression half-ring; 123. Second compression half-ring; 1111. First inclined surface; 1112. Second inclined surface; 1113. First vertical surface; 1211. Third inclined surface; 1212. Fourth inclined surface; 1213. Second vertical surface; 2. Shaft core; 21. First tapered thread; 3. Bearing; 4. Bearing housing; 5. Sleeve; 6. Sealing end cover. Detailed implementation manners

[0038] To further elaborate on the technical means and effects adopted by the present utility model to achieve the intended utility model purpose, the following will, in conjunction with the accompanying drawings and preferred embodiments, detail the specific implementation manners, structures, features, and their effects of the application based on the present utility model as follows. In the following description, different "one embodiment" or "embodiments" do not necessarily refer to the same embodiment. In addition, the specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0039] In the description of the present utility model, it should be clear that the terms "first", "second", etc. in the description and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence; the terms "vertical", "lateral", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "horizontal", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present utility model, rather than meaning that the device or element referred to must have a specific orientation or position, so it cannot be understood as a limitation to the present utility model.

[0040] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0041] The electric spindle is an important structure on a numerically controlled machine tool, and the sealing performance of the electric spindle has a great influence on its accuracy and service life. During the operation of the electric spindle, the cutting fluid will enter the bearing of the spindle, causing damage to the bearing and thus affecting the electric spindle. It can be seen that to ensure the sealing of the electric spindle, first of all, it is necessary to prevent the cutting fluid from entering the bearing. In view of this, the present solution provides the following embodiments, which can effectively prevent the cutting fluid from entering the bearing, and of course, can also prevent other liquids and dust from entering the inner cavity of the electric spindle, improving the safety and reliability of the electric spindle.

[0042] Embodiment 1

[0043] This embodiment provides an electric spindle, as Figures 1-11 shown, the electric spindle includes a retaining ring assembly 1, a shaft core 2, a bearing 3, a bearing housing 4, and a bushing 5. The retaining ring assembly 1 is sleeved outside the shaft core 2 and the two are threadedly connected. The bearing 3 is sleeved on the shaft core 2 and the end face of the bearing 3 abuts against the end face of the retaining ring assembly 1. The bearing housing 4 is sleeved outside the retaining ring assembly 1 and the bearing 3, and is connected to the bushing 5 sleeved on the shaft core 2.

[0044] For a clearer explanation of this embodiment, "up and down" in the following description are both in the illustrated directions and do not represent that the motorized spindle is arranged vertically. Specifically, the retaining ring assembly 1 and the bearing 3 are arranged one above the other, and a bearing housing 4 is arranged outside the retaining ring assembly 1 and the bearing 3. A bushing 5 is connected above the bearing housing 4. That is to say, the shaft core 2 passes through the bushing 5 and the retaining ring assembly 1 from top to bottom in sequence.

[0045] In this embodiment, the retaining ring assembly 1 is sleeved outside the shaft core 2 and the two are threadedly connected. The retaining ring assembly 1 and the shaft core 2 are tightly connected by the thread to achieve sealing. In this embodiment, the sealing between the retaining ring assembly 1 and the shaft core 2 is achieved by threaded connection. Threaded sealing is achieved through the connection of two threaded surfaces to form a tight sealing structure to prevent the leakage or seepage of the medium (mainly cutting fluid in this embodiment). The connection of threaded sealing is realized by the principle of mutual rotation and rapid fitting between the threaded surfaces.

[0046] In this embodiment, the threaded connection connects the retaining ring assembly 1 and the shaft core 2 into a tight whole, making the cutting fluid unable to penetrate; of course, in addition to preventing the cutting fluid from entering, the threaded connection can also effectively seal the inside of the motorized spindle to prevent the intrusion of other external liquids, gases, dust and other media, ensuring that the working environment of the motorized spindle meets the requirements.

[0047] The motorized spindle provided in this embodiment adopts the excellent sealing performance of threaded connection, which can effectively block the cutting fluid from entering the spindle cavity and improve the safety and reliability of the motorized spindle. In addition, the threaded connection also makes the installation and disassembly of the shaft core 2 and the retaining ring assembly 1 convenient. It is not only simple in structure and easy to operate, but also can be reused, and will not lose the sealing performance due to multiple installations and disassembly, thus extending the service life.

[0048] In a specific embodiment, as Figure 10 and 11 shown, the outer surface of the shaft core 2 has a first tapered thread 21, as Figure 4 shown, the inner surface of the retaining ring assembly 1 has a second tapered thread 13, and the first tapered thread 21 cooperates with the second tapered thread 13 to achieve the sealing between the shaft core 2 and the retaining ring assembly 1. That is to say, the sealing between the shaft core 2 and the retaining ring assembly 1 is achieved by tapered threads. Tapered thread sealing is achieved through the fitting of two tapered surfaces. The advantage of tapered thread sealing is reliable sealing, good wear resistance, and being suitable for special working conditions such as high-speed rotation and high temperature and high pressure. In this embodiment, when the shaft core 2 rotates at a high speed, the tapered thread sealing can also ensure that the sealing effect is not affected.

[0049] The outer rings of the shaft segments where the pressing ring assembly 1 mates with the shaft core 2 are all tapered threads. Relying on the tapered threads, the inner pressing spacer ring 11 of the pressing ring assembly 1 is tightly connected to the shaft core 2 and rotates with the shaft core 2. The taper of the first tapered thread 21 is the same as that of the second tapered thread 13, and the contact surface has a good degree of fit. After the inner pressing spacer ring 11 and the shaft core 2 are locked, the threaded sealing surfaces are tightly pressed together and will undergo elastoplastic deformation, thus forming a reliable sealing structure.

[0050] In a specific embodiment, the bearing 3 has an inner ring and an outer ring. The pressing ring assembly 1 includes an inner pressing spacer ring 11 and an outer pressing spacer ring 12. As Figures 1-4 shown, the inner pressing spacer ring 11 is arranged inside the outer pressing spacer ring 12. The end face of the inner pressing spacer ring 11 abuts against the end face of the inner ring of the bearing 3, and the end face of the outer pressing spacer ring 12 abuts against the end face of the outer ring of the bearing 3.

[0051] In this embodiment, the inner surface of the inner pressing spacer ring 11 has the second tapered thread 13. The cooperation between the first tapered thread 21 and the second tapered thread 13 not only provides a good sealing effect but also provides a reliable fixing force. Through the bidirectional pressing of the first tapered thread 21 and the second tapered thread 13, the inner pressing spacer ring 11 and the shaft core 2 are tightly fixed and will not become loose due to vibration and external forces. In this way, during the specific working process, the inner pressing spacer ring 11 and the inner ring of the bearing 3 rotate together with the shaft core 2, while the outer pressing spacer ring 12 and the outer ring of the bearing 3 remain stationary. Since the cooperation between the first tapered thread 21 and the second tapered thread 13 makes the inner pressing spacer ring 11 and the shaft core 2 tightly fixed, the inner pressing spacer ring 11 can rotate together with the shaft core 2 without becoming loose.

[0052] In a specific embodiment, as Figure 4 shown, the outer surface of the inner pressing spacer ring 11 extends outward to form a first serration 111, and the inner surface of the outer pressing spacer ring 12 extends inward to form a second serration 121. The cooperation between the first serration 111 and the second serration 121 realizes the sealing between the inner pressing spacer ring 11 and the outer pressing spacer ring 12.

[0053] The outer surface of the inner pressing spacer ring 11 and the inner surface of the outer pressing spacer ring 12 are both designed to be serrated. After the first serration 111 and the second serration 121 cooperate, the formed zigzag circuit provides a double labyrinth seal in the axial and radial directions, which can effectively prevent cutting fluid and iron chip impurities from entering the main shaft.

[0054] In a specific embodiment, the first serration 111 and the second serration 121 are in clearance fit. The clearance between the first serration 111 and the second serration 121 is 0.1 mm - 0.2 mm.

[0055] The gap between the first serration 111 and the second serration 121 is 0.1 mm - 0.2 mm. If the gap is too small, the processing difficulty will be greater. If the gap is too large, the sealing performance will be insufficient. A gap of 0.1 mm - 0.2 mm can just reduce the processing difficulty while ensuring the sealing effect and further enhance the sealing effect.

[0056] In a specific embodiment, as Figure 7 shown, the first serration 111 includes a first inclined surface 1111, a second inclined surface 1112, and a first vertical surface 1113. The first inclined surface 1111 and the second inclined surface 1112 are arranged opposite to each other vertically. The first vertical surface 1113 is connected between the ends of the first inclined surface 1111 and the second inclined surface 1112 that are away from the inner pressing spacer ring 11. The angles between the first inclined surface 1111 and the horizontal plane and between the second inclined surface 1112 and the horizontal plane are both α, and α satisfies: 30° < α < 60°.

[0057] As Figure 5 shown, the second serration 121 includes a third inclined surface 1211, a fourth inclined surface 1212, and a second vertical surface 1213. The third inclined surface 1211 and the fourth inclined surface 1212 are arranged opposite to each other vertically. The second vertical surface 1213 is connected between the ends of the third inclined surface 1211 and the fourth inclined surface 1212 that are away from the outer pressing spacer ring 12. The angles between the third inclined surface 1211 and the horizontal plane and between the fourth inclined surface 1212 and the horizontal plane are both β, and β satisfies: 30° < β < 60°.

[0058] Specifically, the first serration 111 includes a first inclined surface 1111, a second inclined surface 1112, and a first vertical surface 1113. The angles between the first inclined surface 1111 and the horizontal plane and between the second inclined surface 1112 and the horizontal plane are both between 30° and 60°. The second serration 121 includes a third inclined surface 1211, a fourth inclined surface 1212, and a second vertical surface 1213. The angles between the third inclined surface 1211 and the horizontal plane and between the fourth inclined surface 1212 and the horizontal plane are both between 30° and 60°. When the shaft core 2 rotates at a high speed, the cooperation of the first serration 111 and the second serration 121 forms a centrifugal seal. When the shaft core 2 rotates at a high speed, a large centrifugal force is generated, and the liquid entering the sealing area will be thrown out by the centrifugal force along the first inclined surface 1111, the second inclined surface 1112, the third inclined surface 1211, and the fourth inclined surface 1212.

[0059] To better illustrate the effect of the embodiment, a force analysis is performed on the liquid entering the sealing area. Under high-speed rotation, the liquid is affected by its own gravity and the radial centrifugal force F. According to the formula:

[0060] F = mω 2 r;

[0061]

[0062] In the above formula, m is the mass of the liquid; ω is the angular velocity; r is the radius of rotation; F ω is the resultant force.

[0063] According to the above formula, when the angle of the inclined plane is between 30° and 60°, the liquid is most affected by these two forces. The above-mentioned inclined plane refers to the first inclined plane 1111, the second inclined plane 1112, the third inclined plane 1211 or the fourth inclined plane 1212.

[0064] Thus, the serrated sealing structure formed by the cooperation of the inner pressing spacer ring 11 and the outer pressing spacer ring 12 through the first serrations 111 and the second serrations 121 has achieved multiple sealing effects of labyrinth sealing, small clearance sealing and centrifugal sealing.

[0065] In a specific embodiment, as Figure 1 described, the outer pressing spacer ring 12 includes a first pressing half-ring 122 and a second pressing half-ring 123. After the first pressing half-ring 122 and the second pressing half-ring 123 are spliced, a cavity capable of accommodating the inner pressing spacer ring 11 is formed.

[0066] The first pressing half-ring 122 and the second pressing half-ring 123 can be spliced into the outer pressing spacer ring 12. In this way, during assembly, the inner pressing spacer ring 11 can be placed in the first pressing half-ring 122, and then the second pressing half-ring 123 can be buckled on. In a specific embodiment, the motorized spindle further includes a sealing end cover 6. The sealing end cover 6 is sleeved on the shaft core 2 and is connected to the pressing ring assembly 1 and the bearing housing 4. The sealing end cover 6 can also prevent external dust from entering the spindle. The sealing end cover 6 is connected to the bearing housing 4 and the outer pressing spacer ring 12 by screws at the same time. The sealing end cover 6 is the first barrier of the motorized spindle.

[0067] During assembly, the first pressing half-ring 122 and the second pressing half-ring 123 are buckled together, and the inner pressing spacer ring 11 is placed therein. First, the outer pressing spacer ring 12 and the inner pressing spacer ring 11 are combined into a whole, and then the whole is installed in the bearing housing 4 together, and the inner pressing spacer ring 11 is locked on the shaft core 2, the screws lock the outer pressing spacer ring 12 and the bearing housing 4, and finally the sealing end cover 6 is assembled.

[0068] The motorized spindle provided in this embodiment has multiple layers of seals. The first-level seal is located between the inner pressing spacer ring 11 and the shaft core 2, and the main form is taper thread seal; the second-level seal is located between the outer pressing spacer ring 12 and the inner pressing spacer ring 11, where labyrinth seal, centrifugal seal and small clearance seal are formed.

[0069] In the first-stage seal, the first tapered thread 21 on the outer surface of the shaft core 2 mates with the second tapered thread 13 on the inner surface of the inner pressing spacer ring 11. The inner pressing spacer ring 11 and the shaft core 2 are tightly connected by the tapered thread connection. The tapered thread connection has excellent sealing performance and can effectively prevent cutting fluid from entering the main shaft cavity. In the second-stage seal, the inner pressing spacer ring 11 and the outer pressing spacer ring 12 are in small-clearance fit through the first serrations 111 and the second serrations 121, and at the same time, in combination with the inclined surface with an angle of 30° - 60°. The zigzag circuit formed by the first serrations 111 and the second serrations 121 provides double-labyrinth seals in the axial and radial directions, which can well prevent cutting fluid and iron chip impurities from entering the inside of the main shaft. Moreover, the fit clearance is extremely small, further enhancing the sealing effect. In addition, when the main shaft rotates at a high speed, a centrifugal seal is formed. The liquid entering this sealed area is subjected to the centrifugal force during the high-speed rotation of the main shaft and will be thrown out along the inclined surface. This sealing structure gives full play to the advantages of labyrinth seal, centrifugal seal, and small-clearance seal, and when combined with the tapered thread seal in the first-stage seal, it can effectively prevent water and iron chip impurities from entering the inside of the main shaft.

[0070] The motorized spindle provided in this embodiment combines the serrated seal and the threaded seal, fully improving the sealing performance of the spindle, effectively preventing cutting fluid from entering the inside of the spindle. At the same time, it simplifies the assembly process, improves the assembly efficiency, and makes the assembly, disassembly, and maintenance simple.

[0071] Embodiment 2

[0072] This embodiment provides a numerical control machine tool, and the numerical control machine tool includes the motorized spindle described in Embodiment 1.

[0073] In summary, it is easy for those skilled in the art to understand that, on the premise of no conflict, the above-mentioned advantageous technical features can be freely combined and superimposed.

[0074] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An electric spindle, characterized in that: The electric spindle includes a pressure ring assembly, a shaft core, a bearing, a bearing seat and a sleeve. The pressure ring assembly is sleeved outside the shaft core and the two are threadedly connected. The bearing is sleeved on the shaft core and the end face of the bearing abuts against the end face of the pressure ring assembly. The bearing seat is sleeved outside the pressure ring assembly and the bearing, and is connected to the sleeve sleeved on the shaft core.

2. The electric spindle according to claim 1, characterized in that: The outer surface of the shaft core has a first tapered thread, and the inner surface of the pressure ring assembly has a second tapered thread. The first tapered thread cooperates with the second tapered thread to achieve sealing between the shaft core and the pressure ring assembly.

3. The electric spindle according to claim 1, characterized in that: The compression ring assembly includes an inner compression spacer and an outer compression spacer. The inner compression spacer is arranged inside the outer compression spacer. The end face of the inner compression spacer abuts against the end face of the inner ring of the bearing. The end face of the outer compression spacer abuts against the end face of the outer ring of the bearing.

4. The electric spindle according to claim 3, characterized in that: The outer surface of the inner compression spacer ring extends outward to form a first serration, and the inner surface of the outer compression spacer ring extends inward to form a second serration. The first serration cooperates with the second serration to achieve sealing between the inner compression spacer ring and the outer compression spacer ring.

5. The electric spindle according to claim 4, characterized in that: The first saw tooth and the second saw tooth are clearance-matched; and / or the clearance between the first saw tooth and the second saw tooth is 0.1 mm-0.2 mm.

6. The electric spindle according to claim 4, characterized in that: The first sawtooth includes a first inclined surface, a second inclined surface and a first vertical surface, the first inclined surface and the second inclined surface are arranged opposite to each other up and down, and the first vertical surface is connected between the first inclined surface and the second inclined surface at one end away from the inner compression spacer ring; And / or the second sawtooth includes a third inclined surface, a fourth inclined surface and a second vertical surface, the third inclined surface and the fourth inclined surface are arranged opposite to each other up and down, and the second vertical surface is connected between the third inclined surface and the fourth inclined surface at one end away from the external clamping ring.

7. The electric spindle according to claim 6, characterized in that: The included angle between the first inclined surface and the horizontal plane and the included angle between the second inclined surface and the horizontal plane are both α, wherein α satisfies: 30°<α<60°; And / or the angle between the third inclined plane and the horizontal plane and the angle between the fourth inclined plane and the horizontal plane are both β, wherein β satisfies: 30°<β<60°.

8. The electric spindle according to any one of claims 3 to 7, characterized in that: The outer compression spacer ring comprises a first compression half ring and a second compression half ring, and the first compression half ring and the second compression half ring are spliced ​​to form a cavity capable of accommodating the inner compression spacer ring.

9. The electric spindle according to any one of claims 1 to 7, characterized in that: The electric spindle also includes a sealing end cover, which is sleeved on the shaft core and connected to the pressure ring assembly and the bearing seat.

10. A numerically controlled machine tool, characterized in that: The CNC machine tool comprises the electric spindle according to any one of claims 1-9.

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