Mechanical shaft structure
By employing a labyrinth seal structure and combined components in the mechanical shaft structure, the problem of alloy powder entering the grinding groove electric spindle due to the sealing structure has been solved, achieving high-precision machining and extended service life.
Patent Information
- Application Number
- CN202422827340.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-20
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-11-20
AI Technical Summary
Existing electric spindles for grinding grooves are prone to allowing alloy powder to enter due to the limitations of the sealing structure, resulting in low machining accuracy, reduced bearing life, and high operating costs.
The labyrinth seal structure is adopted, which forms a sealing end by setting an annular protrusion and groove between the central shaft and the sleeve. Combined with components such as bearings, support sleeves, locking parts and sealing rings, it forms a mechanical shaft structure to prevent metal powder and cooling oil from entering, ensuring sealing performance and machining accuracy.
It achieves good sealing performance of the mechanical shaft, improves machining accuracy and service life, and reduces operating costs.
Smart Images
Figure CN223511488U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to mechanical parts technical field especially, relates to a mechanical shaft structure. BACKGROUND
[0002] When the micro drill bit is used for grooving processing of the printed circuit board, higher drilling position precision is required, therefore, in the drilling process using the micro drill bit, the electric spindle with high precision is required to ensure the smoothness of the groove during the grooving and avoid the appearance of vibration marks. However, the existing grooving electric spindle is limited by the sealing structure, alloy powder is easy to enter, the processing precision is low, the service life of the bearing is affected, and the use cost is high.
[0003] Therefore, a mechanical shaft structure is needed to solve the above problems. SUMMARY
[0004] The utility model discloses a kind of mechanical shaft structures, can improve the sealing of mechanical shaft using mechanical structure, prevent alloy powder from entering mechanical shaft, ensure processing precision.
[0005] To achieve this purpose, the utility model adopts the following technical solutions:
[0006] Provide a kind of mechanical shaft structure, comprising:
[0007] Center shaft, the center shaft includes sealing end and shaft body, the sealing end is connected to the one end of the shaft body in axial direction, in radial direction, the size of the sealing end is greater than the size of the shaft body, annular protruding portion is provided on the side of the sealing end towards the shaft body, the protruding portion is around the shaft body;
[0008] Sleeve, the sleeve is sleeved on the shaft body and abuts against the sealing end, annular groove is provided on the side of the sleeve abutting against the sealing end, the groove is matched with the protruding portion.
[0009] As an optional scheme of mechanical shaft structure, the sleeve and the shaft body form accommodating space, and the mechanical shaft structure further includes bearing, the bearing is sleeved on the shaft body and is arranged in the accommodating space.
[0010] As an optional scheme of mechanical shaft structure, the bearing is provided with a plurality of, and at least two bearings are respectively sleeved on both ends of the shaft body in the axial direction.
[0011] As an optional scheme of mechanical shaft structure, the mechanical shaft structure further includes support sleeve, the support sleeve is sleeved on the shaft body and is arranged in the accommodating space, and the support sleeve is supported between two bearings.
[0012] As an alternative to the mechanical shaft structure, the support sleeve includes a first spacer and a second spacer. The first spacer is sleeved on the shaft body, and its two ends abut against the inner rings of the two bearings. The second spacer is sleeved on the first spacer, and its two ends abut against the outer rings of the two bearings.
[0013] As an alternative to the mechanical shaft structure, the mechanical shaft structure further includes a first locking member, which is sleeved on the end of the shaft body away from the sealing end and abuts against the outer ring of the bearing.
[0014] As an alternative to the mechanical shaft structure, the mechanical shaft structure further includes a third spacer sleeve, which is sleeved on the shaft body, and the first locking member is sleeved on the third spacer sleeve, with the third spacer sleeve abutting against the inner ring of the bearing.
[0015] As an alternative to the mechanical shaft structure, the mechanical shaft structure further includes a second locking member, which is sleeved on the shaft body and abuts against the side of the third spacer opposite to the bearing.
[0016] As an alternative to the mechanical shaft structure, the mechanical shaft structure also includes a grinding wheel, the grinding wheel is provided with a fixing groove, the sealing end is fixed in the fixing groove, and the inner wall of the fixing groove covers the groove.
[0017] As an alternative to the mechanical shaft structure, the mechanical shaft structure also includes a sealing ring, which is sleeved between the sealing end and the grinding wheel.
[0018] The beneficial effects of this utility model are:
[0019] This utility model provides a mechanical shaft structure, including a central shaft and a sleeve. The central shaft includes a sealing end and a shaft body. The sleeve is fitted onto the shaft body and abuts against the sealing end. The sealing end has a protrusion on the side facing the shaft body, and the sleeve has a groove on the side facing the sealing end. The protrusion and groove surround the shaft body and match each other to form a labyrinth-type sealing structure. During machining, it can prevent metal powder and cooling oil from entering between the central shaft and the sleeve, ensuring good sealing performance of the mechanical shaft, guaranteeing machining accuracy, and improving the service life of the mechanical shaft. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the mechanical shaft structure provided by this utility model.
[0021] In the picture:
[0022] 100. Central shaft; 110. Sealing end; 111. Sealing groove; 120. Shaft body; 130. Protrusion;
[0023] 200, sleeve; 210, groove;
[0024] 300, bearing; 310, inner ring; 320, outer ring;
[0025] 400, Support sleeve; 410, First spacer sleeve; 420, Second spacer sleeve;
[0026] 500. First locking element; 600. Third spacer; 700. Second locking element;
[0027] 800. Grinding wheel; 810. Fixing groove;
[0028] 900. Sealing ring. Detailed Implementation
[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.
[0030] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0032] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0033] like Figure 1 As shown, the mechanical shaft structure of this embodiment includes a central shaft 100 and a sleeve 200. The central shaft 100 includes a sealing end 110 and a shaft body 120. The sealing end 110 is connected to one axial end of the shaft body 120. In the radial direction, the size of the sealing end 110 is larger than the size of the shaft body 120. An annular protrusion 130 is provided on the side of the sealing end 110 facing the shaft body 120, and the protrusion 130 is wrapped around the shaft body 120. The sleeve 200 is sleeved on the shaft body 120 and abuts against the sealing end 110. An annular groove 210 is provided on the side of the sleeve 200 abutting against the sealing end 110. The groove 210 matches the protrusion 130, and the protrusion 130 can be embedded in the groove 210.
[0034] Based on the above design, the protrusion 130 and the groove 210 are arranged around the shaft body 120 and cooperate with each other, so that a labyrinth seal structure is formed between the central shaft 100 and the sleeve 200. During machining, the labyrinth seal structure can prevent metal powder and cooling oil from entering between the central shaft and the sleeve. Compared with the traditional method where the central shaft 100 and the sleeve 200 only have planar contact, it can ensure good sealing of the mechanical shaft, while ensuring machining accuracy and improving the service life of the mechanical shaft.
[0035] Furthermore, the mechanical shaft structure also includes a bearing 300, and a receiving space 210 is formed between the sleeve 200 and the shaft body 120. The bearing 300 is sleeved on the shaft body 120 and disposed in the receiving space 210, thereby realizing the relative rotation between the sleeve 200 and the shaft body 120.
[0036] Preferably, multiple bearings 300 are provided. Multiple bearings 300 ensure stability during relative rotation between the sleeve 200 and the shaft body 120, guaranteeing the coaxiality of the sleeve 200 and the shaft body 120, thereby ensuring stability and accuracy during rotary machining. Optionally, at least two bearings 300 are respectively sleeved at both ends of the shaft body 120 in the axial direction. In this embodiment, two pairs of angular contact ball bearings are provided between the sleeve 200 and the shaft body 120. Two bearings 300 from each pair of angular contact ball bearings are respectively sleeved at both ends of the shaft body 120. Bearings 300 located at the same end abut against each other, ensuring structural stability and rotational accuracy.
[0037] Furthermore, the mechanical shaft structure also includes a support sleeve 400, which is sleeved on the shaft body 120 and disposed in the receiving space 210. The support sleeve 400 is supported between two bearings 300 to ensure the stability of the relative position between the bearings 300.
[0038] Specifically, the support sleeve 400 includes a first spacer 410 and a second spacer 420. The first spacer 410 is fitted onto the shaft body, with its two ends abutting between the inner rings 310 of the two bearings 300. The second spacer 420 is fitted onto the first spacer 410, abutting between the outer rings 320 of the two bearings 300. Since axial relative movement may occur between the shaft body 120 and the sleeve 200 during machining, causing axial displacement between the inner rings 310 and outer rings 320 of the bearings 300, the first spacer 410 and the second spacer 420 ensure relative stability between the inner rings 310 and outer rings 320 of the different bearings 300. This allows for misalignment between the inner rings 310 and outer rings 320 when the central shaft 100 is subjected to axial force, thus ensuring the performance and service life of the bearings 300.
[0039] Furthermore, the mechanical shaft structure also includes a first locking member 500, which is sleeved on the end of the shaft body 120 away from the sealing end 110 and abuts against the outer ring 320 of the bearing 300.
[0040] Furthermore, the mechanical shaft structure also includes a third spacer 600 and a second locking member 700. The second locking member 700 and the third spacer 600 are sleeved on the shaft body 120. The first locking member 500 is sleeved on the third spacer 600. The third spacer 600 abuts against the inner ring 310 of the bearing 300. The second locking member 700 abuts against the side of the third spacer 600 away from the bearing 300.
[0041] The first locking member 500 abuts against the outer ring 320, and the second locking member 700 and the third spacer 600 abut against the inner ring 310, so that the bearing 300 can abut against the sealing end 110, ensuring a stable connection of the bearing 300. Optionally, in this embodiment, both the first locking member 500 and the second locking member 700 are lock nuts, which are simple in structure and easy to assemble.
[0042] Furthermore, the mechanical shaft structure also includes a grinding wheel 800, which is provided with a fixing groove 810. The sealing end 110 is fixed in the fixing groove 810. The inner wall of the fixing groove 810 covers the groove 210, which can block metal powder and cooling oil and prevent metal powder and cooling oil from entering the groove 210.
[0043] The mechanical shaft structure also includes a sealing ring 900, which is fitted between the sealing end 110 and the grinding wheel 800 to ensure the seal between the central shaft 100 and the grinding wheel 800.
[0044] Optionally, an annular sealing groove 111 is provided on the side wall of the sealing end 110, and the sealing ring 900 can be installed in the sealing groove 111 to facilitate the installation and positioning of the sealing ring 900.
[0045] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A mechanical shaft structure, characterized in that, include: A central shaft (100) includes a sealing end (110) and a shaft body (120). The sealing end (110) is connected to one axial end of the shaft body (120). In the radial direction, the size of the sealing end (110) is larger than the size of the shaft body (120). An annular protrusion (130) is provided on the side of the sealing end (110) facing the shaft body (120). The protrusion (130) is wrapped around the shaft body (120). A sleeve (200) is fitted onto the shaft body (120) and abuts against the sealing end (110). An annular groove (210) is provided on one side of the sleeve (200) that abuts against the sealing end (110). The groove (210) matches the protrusion (130).
2. The mechanical shaft structure according to claim 1, characterized in that, The sleeve (200) and the shaft body (120) form a receiving space. The mechanical shaft structure also includes a bearing (300), which is sleeved on the shaft body (120) and disposed in the receiving space.
3. The mechanical shaft structure according to claim 2, characterized in that, Multiple bearings (300) are provided, and at least two bearings (300) are respectively sleeved on both ends of the shaft body (120) in the axial direction.
4. The mechanical shaft structure according to claim 3, characterized in that, The mechanical shaft structure also includes a support sleeve (400), which is sleeved on the shaft body (120) and disposed in the accommodating space, and the support sleeve (400) is supported between the two bearings (300).
5. The mechanical shaft structure according to claim 4, characterized in that, The support sleeve (400) includes a first spacer (410) and a second spacer (420). The first spacer (410) is sleeved on the shaft body, and the two ends of the first spacer (410) abut against the inner rings (310) of the two bearings (300). The second spacer (420) is sleeved on the first spacer (410) and abuts against the outer rings (320) of the two bearings (300).
6. The mechanical shaft structure according to claim 2, characterized in that, The mechanical shaft structure also includes a first locking member (500), which is sleeved on the end of the shaft body (120) away from the sealing end (110) and abuts against the outer ring (320) of the bearing (300).
7. The mechanical shaft structure according to claim 6, characterized in that, The mechanical shaft structure also includes a third spacer (600), which is sleeved on the shaft body (120), and the first locking member (500) is sleeved on the third spacer (600). The third spacer (600) abuts against the inner ring (310) of the bearing (300).
8. The mechanical shaft structure according to claim 7, characterized in that, The mechanical shaft structure also includes a second locking member (700), which is sleeved on the shaft body (120) and abuts against the side of the third spacer (600) away from the bearing (300).
9. The mechanical shaft structure according to claim 1, characterized in that, The mechanical shaft structure also includes a grinding wheel (800), the grinding wheel (800) is provided with a fixing groove (810), the sealing end (110) is fixed in the fixing groove (810), and the inner wall of the fixing groove (810) covers the groove (210).
10. The mechanical shaft structure according to claim 9, characterized in that, The mechanical shaft structure also includes a sealing ring (900), which is sleeved between the sealing end (110) and the grinding wheel (800).