High-precision machine tool spindle assembling structure

Abstract

The utility model relates to a high-precision machine tool spindle assembling structure which is applied to the technical field of machine tool equipment and comprises a mounting sleeve and a spindle, and two first bearing assemblies and two second bearing assemblies are arranged in an inner cavity of the mounting sleeve; the two ends of the main shaft are a mounting end and a fixing end respectively, the fixing end is arranged on the two first bearing assemblies and the two second bearing assemblies in a penetrating mode, and limiting pieces are arranged on the sides, away from the first bearing assemblies, of the two second bearing assemblies on the ring surface of the main shaft. And an elastic component for enabling the second bearing to have a trend of moving towards one side far away from the first bearing is arranged on the mounting sleeve. After long-time machining and production, when a gap is generated between the raceway and the ball, the elastic assembly enables the second bearings to move towards the side away from the first bearing, the main shaft moves towards the side away from the fixed end, the inner ring of the first bearing moves along with the main shaft, and the bearing ball is tightly attached to the raceway; and the corresponding first bearing and the second bearing work normally, so that the service life of the bearings is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of machine tool equipment, and in particular to a high-precision machine tool spindle assembly structure. Background Art

[0002] A machine tool refers to a machine that uses various cutting or non-cutting methods and appropriate tools to process metal or non-metal materials (hereinafter referred to as parent materials) in a certain shape and size, or for the purpose of further more precise processing.

[0003] The spindle is an important component of the machine tool. The spindle is large in size and heavy in weight. In the prior art, the spindle is generally installed on the machine base through bearings. After working for a long time, the bearings will be worn, and a gap will be generated between the bearing raceway and the ball, resulting in abnormal operation and affecting the processing efficiency.

[0004] In view of this, there is an urgent need for a high-precision machine tool spindle assembly structure to solve the above problems. Summary of the invention

[0005] In order to help solve the problems existing in the prior art, the present application provides a high-precision machine tool spindle assembly structure, which adopts the following technical solution: comprising: a mounting sleeve and a spindle, wherein the inner cavity of the mounting sleeve is provided with two first bearing assemblies and two second bearing assemblies;

[0006] The first bearing assembly comprises a plurality of first bearings, the first bearings of two first bearing assemblies are arranged in series, the first bearings of each first bearing assembly are arranged in the same direction, and the first bearings of the two first bearing assemblies are arranged back to back, the mounting sleeve is provided with a first clamping groove for clamping the outer ring of the first bearing, and the main shaft is provided with a second clamping groove for clamping the inner ring of the first bearing;

[0007] The second bearing assembly comprises a plurality of second bearings, wherein the second bearings of two second bearing assemblies are arranged in series, the second bearings of the two second bearing assemblies are arranged in the same direction, and the front faces of the second bearings of the second bearing assemblies face away from the first bearing assembly;

[0008] The two ends of the main shaft are respectively a mounting end and a fixed end, the fixed end is penetrated through two first bearing assemblies and two second bearing assemblies, a limiting member is arranged on the side of the two second bearing assemblies away from the first bearing assembly, and an elastic component is arranged on the mounting sleeve to make the second bearing have a tendency to move toward the side away from the first bearing.

[0009] Through the above technical solution, after a long period of processing and production, the first bearing and the second bearing are worn, and a gap is generated between the raceway and the ball. The elastic component causes the multiple second bearings to move to the side away from the first bearing, so that they abut against the limiter, thereby causing the main shaft to move toward the side away from the fixed end, causing the inner ring of the first bearing to move with the main shaft, causing the bearing balls to cling to the raceway, and allowing the corresponding first bearing and second bearing to work normally, thereby increasing the service life of the bearings and further improving the production and processing efficiency of the machine tool.

[0010] In a specific possible implementation manner, two first bearing assemblies are arranged on a side of the mounting sleeve close to the fixed end, and each of the first bearing assemblies includes two first bearings.

[0011] Through the above technical solution, the four first bearings are connected in series in pairs and matched back to back. The four first bearings are arranged to support the side of the fixed end close to the installation end, thereby playing a stable supporting role.

[0012] In a specific possible implementation manner, two of the second bearing assemblies are arranged on a side of the mounting sleeve away from the mounting end, and the second bearing assembly includes a second bearing.

[0013] Through the above technical solution, the two second bearings are assembled in pairs and matched in series. The tail of the main shaft fixing part is supported by the two second bearings, which provides stable support while reducing costs.

[0014] In a specific embodiment, the first bearing and the second bearing are both angular contact ball bearings.

[0015] Through the above technical solution, angular contact ball bearings are adopted, which have the advantages of strong load capacity, high speed, precise positioning and long life.

[0016] In a specific possible implementation scheme, the limiting member includes a plurality of first bolts, and the plurality of first bolts are threadedly connected to the main shaft.

[0017] Through the above technical solution, by providing a plurality of first bolts, the second bearing is limited and the disassembly and assembly of the second bearing is facilitated.

[0018] In a specific possible implementation scheme, the elastic component includes a ring plate and an elastic member, the ring plate is sleeved on the main shaft, the ring plate is arranged on the side of the two second bearing components close to the first bearing component, and the elastic member is arranged on the side of the ring plate away from the second bearing component.

[0019] Through the above technical solution, the elastic force of the elastic member causes the ring plate to move toward the second bearing.

[0020] In a specific possible implementation manner, the elastic member includes a plurality of springs, one end of each spring is disposed on the mounting sleeve, and the other end of each spring is connected to the ring plate.

[0021] Through the above technical solution, a plurality of springs are provided, and the springs exert elastic force on the ring plate.

[0022] In a specific possible implementation manner, the inner cavity of the mounting sleeve is provided with an annular first step surface facing the mounting end, and an end cover is provided on one side of the mounting sleeve close to the mounting end, and the end cover and the first step surface form a first slot.

[0023] Through the above technical solution, the two first bearing assemblies are placed between the first step surface and the end cover, and the first step surface abuts against one side of the outer ring of the first bearing. When the inner ring of the first bearing moves axially, it is displaced relative to the outer ring.

[0024] In a specific possible implementation manner, the end cover is fixed to the mounting sleeve by bolts.

[0025] Through the above technical solution, the end cover is fixed to the installation sleeve by bolts, so that the end cover can be easily disassembled and assembled.

[0026] In a specific possible implementation scheme, an annular second step surface is formed between the mounting end and the fixed end, a plurality of second bolts are circumferentially arranged on the annular surface of the main shaft, and the plurality of second bolts and the second step surface form a second slot.

[0027] Through the above technical solution, the inner rings of the plurality of first bearings are clamped between the plurality of second bolts and the second step surface, so that when the main shaft moves axially, the inner rings of the first bearings move accordingly.

[0028] To sum up, after long-term processing and production, the first bearing and the second bearing are worn, and a gap is generated between the raceway and the ball. The elastic component causes the multiple second bearings to move to the side away from the first bearing, so that they abut against the limiter, thereby causing the main shaft to move toward the side away from the fixed end, so that the inner ring of the first bearing moves with the main shaft, and the bearing balls are close to the raceway, so that the corresponding first bearing and second bearing can work normally, thereby increasing the service life of the bearings and further improving the production and processing efficiency of the machine tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0030] Figure numerals: 1. mounting sleeve; 11. first step surface; 2. main shaft; 21. second step surface; 3. first bearing; 4. second bearing; 5. first bolt; 6. ring plate; 7. spring; 8. end cover; 9. second bolt. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0032] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product or equipment comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0033] The following is combined with Figure 1 This application is further described in detail.

[0034] Reference Figure 1A high-precision machine tool spindle assembly structure comprises: a mounting sleeve 1 and a spindle 2, wherein the mounting sleeve 1 is arranged on the machine tool, and the inner cavity of the mounting sleeve 1 is provided with two first bearing assemblies and two second bearing assemblies; the first bearing assembly comprises a plurality of first bearings 3, the first bearings 3 of the two first bearing assemblies are arranged in series, the first bearings 3 of each first bearing assembly are arranged in the same direction, the first bearings 3 of the two first bearing assemblies are arranged back to back, the mounting sleeve 1 is provided with a first clamping groove for clamping the outer ring of the first bearing 3, and the spindle 2 is provided with a second clamping groove for clamping the inner ring of the first bearing 3; the second bearing assembly comprises a plurality of second bearings 4, the second bearings 4 of the two second bearing assemblies are arranged in series, the second bearings 4 of the two second bearing assemblies are arranged in the same direction, the front side of the second bearing 4 of the second bearing assembly faces the direction away from the first bearing assembly, and is aligned with the two first bearings 3 in the first bearing assembly away from the second bearing assembly. They are arranged back to back; the two ends of the main shaft 2 are respectively an installation end and a fixed end, the fixed end is penetrated through the two first bearing assemblies and the two second bearing assemblies, a limiting member is arranged on the annular surface of the main shaft 2 on the side of the two second bearing assemblies away from the first bearing assembly, and an elastic member is arranged on the mounting sleeve 1 to make multiple second bearings 4 have a tendency to move toward the side away from the first bearing 3. In this way, after long-term processing and production and the main shaft is heated and elongated, the first bearing 3 and the second bearing 4 are worn, and a gap is generated between the raceway and the ball, the elastic member will make multiple second bearings 4 move toward the side away from the first bearing 3, so that they abut against the limiting member, thereby making the main shaft 2 move toward the side away from the fixed end, making the inner ring and the ball of the first bearing 3 move with the main shaft 2, making the bearing balls close to the raceway, making the corresponding first bearing 3 and the second bearing 4 work normally, thereby increasing the service life of the bearings and further improving the production and processing efficiency of the machine tool.

[0035] Reference Figure 1 , two first bearing assemblies are arranged on one side of the mounting sleeve 1 close to the fixed end, and each first bearing assembly includes two first bearings 3 (the best solution is selected according to the actual processing situation, and the first bearing assembly in this embodiment includes two first bearings 3). In this way, the four first bearings 3 are connected in series in pairs back to back (QBC matching method). By arranging four first bearings 3 to support the side of the fixed end close to the mounting end, a stable supporting effect is played.

[0036] Reference Figure 1 The two second bearing assemblies are arranged on the side of the mounting sleeve 1 away from the mounting end, and the second bearing assembly includes a second bearing 4 (the best solution is selected according to the actual processing situation. In this embodiment, the second bearing assembly includes a second bearing 4). In this way, the two second bearings 4 are assembled in pairs and matched in series in pairs (DT matching method). The tail of the fixed part of the main shaft 2 is supported by the two second bearings 4, which provides stable support while reducing costs.

[0037] Reference Figure 1 The first bearing 3 and the second bearing 4 are both angular contact ball bearings, and the best angular contact ball bearings can bear the combined load of radial and axial loads at the same time, and limit the axial displacement of the shaft in both directions. It has the advantages of strong load capacity, high speed, precise positioning and long life.

[0038] Reference Figure 1 The limiting member includes a plurality of first bolts 5, and the plurality of first bolts 5 are threadedly connected to the main shaft 2. Thus, by providing a plurality of first bolts 5, it is convenient to disassemble and assemble the second bearing 4.

[0039] Reference Figure 1 The elastic component includes a ring plate 6 and an elastic member. The ring plate 6 is sleeved on the main shaft 2. The ring plate 6 is arranged on the side of the two second bearing assemblies close to the first bearing assembly. The elastic member is arranged on the side of the ring plate 6 away from the second bearing assembly. The elastic member includes a plurality of springs 7 distributed in a circumference. One end of the spring 7 is arranged on the mounting sleeve 1, and the other end is connected to the ring plate 6. In this way, the elastic force of the plurality of springs 7 causes the ring plate 6 to move toward the second bearing 4, so that the second bearing 4 moves to the side away from the mounting end, and the main shaft 2 moves through the limiter.

[0040] Reference Figure 1 A first annular step surface 11 is formed on the inner surface of the mounting sleeve 1 near the mounting portion. An end cover 8 is provided on the side of the mounting sleeve 1 near the mounting end. The end cover 8 and the first step surface 11 form a first groove. The end cover 8 is fixed to the mounting sleeve 1 by bolts. In this way, the two first bearing assemblies are placed between the first step surface 11 and the end cover 8, and the first step surface 11 contacts the outer ring side of the first bearing 3. When the inner ring of the first bearing 3 moves axially, it is relatively displaced with the outer ring.

[0041] Reference Figure 1 An annular second step surface 21 is formed between the mounting end and the fixed end (the diameter of the fixed end is smaller than the diameter of the mounting end), and a plurality of second bolts 9 are circumferentially arranged on the annular surface of the main shaft 2. The plurality of second bolts 9 and the second step surface 21 form a second clamping groove. In this way, the inner rings of the plurality of first bearings 3 are clamped between the plurality of second bolts 9 and the second step surface 21, so that when the main shaft 2 moves axially, the inner ring of the first bearing 3 moves accordingly.

[0042] In summary: after long-term processing and production, the first bearing 3 and the second bearing 4 are worn, and a gap is generated between the raceway and the ball. The elastic component causes the multiple second bearings 4 to move to the side away from the first bearing 3, so that they abut against the limiter, thereby causing the main shaft 2 to move toward the side away from the fixed end, so that the inner ring of the first bearing 3 moves with the main shaft 2, so that the bearing balls are close to the raceway, so that the corresponding first bearing 3 and the second bearing 4 can work normally, thereby increasing the service life of the bearings and further improving the production and processing efficiency of the machine tool.

[0043] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A high-precision machine tool spindle assembly structure, characterized in that: include: A mounting sleeve (1) and a main shaft (2), wherein the inner cavity of the mounting sleeve (1) is provided with two first bearing assemblies and two second bearing assemblies; The first bearing assembly comprises a plurality of first bearings (3), the first bearings (3) of two first bearing assemblies are arranged in series, the first bearings (3) of each first bearing assembly are arranged in the same direction, and the first bearings (3) of the two first bearing assemblies are arranged back to back, the mounting sleeve (1) is provided with a first groove for clamping the outer ring of the first bearing (3), and the main shaft (2) is provided with a second groove for clamping the inner ring of the first bearing (3); The second bearing assembly comprises a plurality of second bearings (4), wherein the second bearings (4) of two second bearing assemblies are arranged in series, the second bearings (4) of the two second bearing assemblies are arranged in the same direction, and the front faces of the second bearings (4) of the second bearing assemblies face away from the first bearing assembly; The two ends of the main shaft (2) are respectively a mounting end and a fixed end, the fixed end is inserted into two first bearing assemblies and two second bearing assemblies, a limiting member is arranged on the annular surface of the main shaft (2) on the side of the two second bearing assemblies away from the first bearing assembly, and an elastic assembly is arranged on the mounting sleeve (1) so that the second bearing (4) has a tendency to move towards a side away from the first bearing (3).

2. The high-precision machine tool spindle assembly structure according to claim 1, characterized in that: The two first bearing assemblies are arranged on one side of the mounting sleeve (1) close to the fixed end, and each of the first bearing assemblies comprises two first bearings (3).

3. The high-precision machine tool spindle assembly structure according to claim 1, characterized in that: The two second bearing assemblies are arranged on a side of the mounting sleeve (1) away from the mounting end, and the second bearing assembly comprises a second bearing (4).

4. The high-precision machine tool spindle assembly structure according to claim 1, characterized in that: The first bearing (3) and the second bearing (4) are both angular contact ball bearings.

5. The high-precision machine tool spindle assembly structure according to claim 1, characterized in that: The limiting member comprises a plurality of first bolts (5), and the plurality of first bolts (5) are threadedly connected to the main shaft (2).

6. The high-precision machine tool spindle assembly structure according to claim 1, characterized in that: The elastic component comprises a ring plate (6) and an elastic member, wherein the ring plate (6) is sleeved on the main shaft (2), the ring plate (6) is arranged on a side of the two second bearing components close to the first bearing component, and the elastic member is arranged on a side of the ring plate (6) away from the second bearing component.

7. The high-precision machine tool spindle assembly structure according to claim 6, characterized in that: The elastic member comprises a plurality of springs (7), one end of each spring (7) is arranged on the mounting sleeve (1), and the other end of each spring (7) is connected to the ring plate (6).

8. The high-precision machine tool spindle assembly structure according to claim 1, characterized in that: The inner cavity of the installation sleeve (1) is provided with an annular first step surface (11) facing the installation end, and the side of the installation sleeve (1) close to the installation end is provided with an end cover (8), and the end cover (8) and the first step surface (11) form a first slot.

9. The high-precision machine tool spindle assembly structure according to claim 8, characterized in that: The end cover (8) is fixed to the mounting sleeve (1) by means of bolts.

10. The high-precision machine tool spindle assembly structure according to claim 1, characterized in that: An annular second step surface (21) is formed between the mounting end and the fixed end, and a plurality of second bolts (9) are circumferentially arranged on the annular surface of the main shaft (2), and the plurality of second bolts (9) and the second step surface (21) form a second clamping groove.

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