Direct drive numerical control milling head interface sealing protection device
Patent Information
- Application Number
- CN202522230874.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-22
- Publication Date
- 2026-10-23
- Estimated Expiration
- 2035-10-22
AI Technical Summary
[0004]数控铣削过程会产生大量高温、高压的切削液油雾和细微金属粉尘，这些污染物具有极强的渗透性，传统平面法兰的密封仅依赖于螺栓预紧力压紧垫片所产生的变形来填充两个理想平面间的微观空隙，但在实际加工中，机床主轴系统持续承受着巨大的径向、轴向切削力以及频繁启停带来的振动，导致法兰连接面会产生微小的相对位移或翘曲变形，从而使得密封垫片的压紧力分布不均甚至出现松弛，最终在密封界面形成微观泄漏通道，导致污染物侵入
[0015]1.本实用新型通过设置由环形凸起、环形凹槽及专用密封垫构成的端面主密封，并结合环形密封胶槽，形成了高效的多重密封屏障，不仅提供了极高的初始密封性，其“凸凹”配合方式更能有效适应工作过程中的热变形与振动，保持密封压力的稳定，极大地提升了阻挡内部油雾和外部污染物侵入的可靠性，从而保护直驱电机与主轴轴承免受损害。
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Figure CN224879447U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of milling head interface sealing technology, and more specifically to a direct-drive CNC milling head interface sealing and protection device. Background Technology
[0002] As a core functional component of high-end CNC machine tools, the direct-drive CNC milling head eliminates intermediate transmission links such as gears and belts, directly connecting the direct-drive motor to the milling head spindle. It has significant advantages such as short transmission chain, fast dynamic response, high precision, and low noise, and has been widely used in five-axis linkage machining centers in fields such as precision molds, aerospace, and automobile manufacturing.
[0003] The connection between the direct drive motor and the spindle housing is usually achieved through a large interface flange. The sealing reliability of this interface is the key to the long-term stable operation of the entire milling head.
[0004] The CNC milling process generates a large amount of high-temperature, high-pressure cutting fluid mist and fine metal dust. These contaminants have extremely strong penetrability. The sealing of traditional flat flanges relies solely on the deformation caused by the bolt preload pressing the gasket to fill the microscopic gap between two ideal planes. However, in actual machining, the machine tool spindle system continuously bears huge radial and axial cutting forces as well as vibrations caused by frequent starts and stops. This causes the flange connection surface to produce tiny relative displacements or warping deformations, resulting in uneven distribution of the gasket's clamping force or even loosening. Ultimately, this forms microscopic leakage channels at the sealing interface, leading to the intrusion of contaminants. Utility Model Content
[0005] In order to overcome the above-mentioned defects of the prior art, this utility model provides a direct-drive CNC milling head interface sealing and protection device to solve the problems existing in the background art.
[0006] This utility model provides the following technical solution: a direct-drive CNC milling head interface sealing and protection device, including a spindle housing and a direct-drive motor. The bottom of the spindle housing and the top of the direct-drive motor are respectively fixedly connected to a flange one and a flange two. The lower surface of the flange one is provided with an annular groove. The upper surface of the flange two is integrally formed with an annular protrusion similar in shape to the annular groove. A sealing gasket similar in shape to both is installed between the annular protrusion and the annular groove. The inner edge of the lower edge of the flange one is integrally formed with an insert ring, and the inner diameter of the insert ring is the same as the inner diameter of the flange one. The inner edge of the upper surface of the flange two is provided with an annular groove for use with the insert ring.
[0007] As a further embodiment of this utility model, U-shaped annular grooves are provided at the outer edge of the lower surface of the first flange and the outer edge of the upper surface of the second flange. When the first flange and the second flange are fitted together, the two U-shaped annular grooves form an H-shaped cavity, and an H-shaped retaining ring is provided in the H-shaped cavity.
[0008] As a further embodiment of this utility model, the top and bottom ends of the H-shaped retaining ring are respectively fitted to the inner walls of the U-shaped ring grooves on flange one and flange two.
[0009] As a further embodiment of this invention, a sealing ring is bonded between the H-shaped retaining ring and the U-shaped ring groove.
[0010] As a further embodiment of this utility model, each of the edges of multiple mounting holes on the lower surface of the flange is fixedly connected with a downwardly extending annular insert, and each of the edges of multiple mounting holes on the upper surface of the flange is provided with a clearance groove that cooperates with the annular insert.
[0011] As a further embodiment of this utility model, at least one annular sealing groove is also provided at the bottom of the annular groove.
[0012] As a further embodiment of this invention, there is a gap between the outer wall of the annular insert and the inner wall of the clearance groove, and the gap is filled with an O-ring seal.
[0013] As a further embodiment of this utility model, an anti-collision protective cover is also provided at the outer edge of the mating joint between flange one and flange two.
[0014] The technical effects and advantages of this utility model are as follows:
[0015] 1. This utility model forms a highly efficient multi-layer sealing barrier by setting an end face main seal composed of an annular protrusion, an annular groove and a special sealing gasket, combined with an annular sealing groove. It not only provides extremely high initial sealing performance, but its "convex and concave" fit can also effectively adapt to thermal deformation and vibration during operation, maintain stable sealing pressure, and greatly improve the reliability of blocking internal oil mist and external contaminants from intrusion, thereby protecting the direct drive motor and spindle bearing from damage.
[0016] 2. This utility model achieves a second strong sealing defense by setting a circumferential locking and sealing structure composed of an H-shaped retaining ring and a sealing ring on the outer edge. It provides excellent vibration and impact resistance, prevents the flange connection from loosening, effectively seals off the path of intrusion from the outer edge, and works in synergy with the main end face seal to significantly enhance the robustness and durability of the overall sealing effect.
[0017] 3. This utility model uses an annular insert and a relief groove to fill with an O-ring seal, which achieves precise sealing of potential leakage points, simplifies the assembly process, ensures alignment accuracy, avoids bolts bearing shear force, improves connection rigidity and safety, and eliminates the possibility of coolant and oil mist seeping along the bolt thread gap, thus plugging the last common weak point of leakage. Attached Figure Description
[0018] Figure 1 This is a perspective view of the present invention.
[0019] Figure 2 For the present utility model Figure 1 Exploded view.
[0020] Figure 3 This is a structural diagram of flange one and flange two of this utility model.
[0021] The attached figures are labeled as follows: 1. Spindle housing; 2. Direct drive motor; 3. Flange 1; 4. Flange 2; 5. Annular protrusion; 6. Annular groove; 7. Insert groove; 8. Insert ring; 9. Alternating groove; 10. Annular insert; 11. U-shaped annular groove; 12. H-shaped retaining ring; 13. Sealing ring. Detailed Implementation
[0022] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. This utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0023] Reference Figures 1-3 This utility model provides a direct-drive CNC milling head interface sealing and protection device, including a spindle housing 1 and a direct-drive motor 2. The bottom of the spindle housing 1 and the top of the direct-drive motor 2 are respectively fixedly connected to a flange 3 and a flange 4 by bolts. The lower surface of the flange 3 has an annular groove 6. The upper surface of the flange 4 has an annular protrusion 5 with a shape similar to the annular groove 6. A sealing gasket with a similar shape to the annular protrusion 5 is installed between the annular protrusion 5 and the annular groove 6. The inner edge of the lower edge of the flange 3 has an embedded ring 8, and the inner diameter of the embedded ring 8 is the same as the inner diameter of the flange 3. The inner edge of the upper surface of the flange 4 has an annular groove 7 that cooperates with the embedded ring 8. The bottom of the annular groove 6 also has at least one annular sealing groove.
[0024] When flange 3 and flange 4 are tightened together by bolts, the annular protrusion 5 on flange 4 will be precisely embedded in the annular groove 6 of flange 3, and the insert ring 8 will also be inserted into the corresponding groove 7. The sealing gasket squeezed between the annular protrusion 5 and the annular groove 6 acts as the main sealing element. Under the huge bolt preload, it undergoes elastic or plastic deformation, completely filling the microscopic unevenness between the two metal mating surfaces, forming a reliable first metal-composite material sealing barrier, which mainly blocks the intrusion of internal oil vapor and most external pollutants.
[0025] By setting up an end face main seal consisting of an annular protrusion 5, an annular groove 6 and a special sealing gasket, and combining it with an annular sealing groove, a highly efficient multi-layer sealing barrier is formed. This not only provides extremely high initial sealing performance, but its "convex-concave" fit can also effectively adapt to thermal deformation and vibration during operation, maintain stable sealing pressure, and greatly improve the reliability of blocking internal oil mist and external contaminants from intrusion, thereby protecting the direct drive motor 2 and the spindle bearing from damage.
[0026] Furthermore, U-shaped annular grooves 11 are provided at the outer edge of the lower surface of flange 3 and the outer edge of the upper surface of flange 4. When flange 3 and flange 4 are fitted together, the two U-shaped annular grooves 11 form an H-shaped cavity, and an H-shaped retaining ring 12 is provided in the H-shaped cavity.
[0027] Furthermore, the top and bottom of the H-shaped retaining ring 12 are respectively fitted to the inner walls of the U-shaped ring groove 11 on flange 1 3 and flange 2 4, and a sealing ring 13 is bonded between the H-shaped retaining ring 12 and the U-shaped ring groove 11.
[0028] At the edge where the two flanges meet, the U-shaped grooves 11 on them are joined together to form a complete H-shaped cavity. The H-shaped retaining ring 12 embedded in it, and the sealing ring 13 bonded between the H-shaped retaining ring 12 and the U-shaped groove 11, further fill all the micro gaps, transforming the labyrinth seal into a highly efficient contact seal, completely sealing off the channels that can intrude from the outer edge of the flange.
[0029] By setting a circumferential locking and sealing structure consisting of an H-shaped retaining ring 12 and a sealing ring 13 on the outer edge, a second strong sealing defense is achieved, providing excellent vibration and impact resistance, preventing the flange connection from loosening, effectively sealing off the path of intrusion from the outer edge, and working in synergy with the main end face seal to significantly enhance the robustness and durability of the overall sealing effect.
[0030] In this utility model, multiple mounting holes on the lower surface of flange 3 are welded with downward-extending annular inserts 10, and multiple mounting holes on the upper surface of flange 4 are provided with clearance grooves 9 that cooperate with the annular inserts 10.
[0031] Furthermore, there is a gap between the outer wall of the annular insert 10 and the inner wall of the recess groove 9, and the gap is filled with an O-ring seal.
[0032] An annular insert 10 extending downwards is provided at the mounting hole of flange 3, which is inserted into the relief groove 9 of flange 4. This structure not only acts as a positioning pin to facilitate assembly, but also prevents the bolts from being subjected to shear force, thus improving the reliability of the connection. The O-ring seal filled in the gap between the outer wall of the annular insert 10 and the inner wall of the relief groove 9 forms an independent annular seal for each bolt hole, effectively preventing coolant, oil mist, etc. from "creeping" along the bolt thread gap and invading into the motor, thus blocking any possible leakage.
[0033] The use of annular insert 10 in conjunction with relief groove 9 and filling with O-ring seals achieves precise sealing of potential leakage points, simplifies the assembly process, ensures alignment accuracy, avoids bolts bearing shear force, improves connection rigidity and safety, and eliminates the possibility of coolant and oil mist leaking along bolt thread gaps, plugging the last common weak point of leakage.
[0034] In this utility model, an anti-collision protective cover is also provided at the outer edge of the mating joint between flange 3 and flange 4.
[0035] The use of this utility model involves the following steps:
[0036] S1: When flange 3 and flange 4 are tightened together by bolts, the annular protrusion 5 on flange 4 will be precisely embedded in the annular groove 6 of flange 3, and the insert ring 8 will also be inserted into the corresponding groove 7. The sealing gasket squeezed between the annular protrusion 5 and the annular groove 6 serves as the main sealing element. Under the huge bolt preload, it undergoes elastic or plastic deformation, completely filling the microscopic unevenness between the two metal mating surfaces, forming a reliable first metal-composite material sealing barrier, which mainly blocks the intrusion of internal oil vapor and most external pollutants.
[0037] S2: At the edge where the two flanges meet, the U-shaped annular grooves 11 on them are joined together to form a complete H-shaped cavity. The H-shaped retaining ring 12 embedded in it and the sealing ring 13 bonded between the H-shaped retaining ring 12 and the U-shaped annular groove 11 further fill all the micro gaps, transforming the labyrinth seal into a highly efficient contact seal, completely sealing off the channel that can invade from the outer edge of the flange.
[0038] S3: A downward-extending annular insert 10 is provided at the mounting hole of flange 1 3, which is inserted into the relief groove 9 of flange 2 4. This structure not only acts as a positioning pin to facilitate assembly, but also prevents the bolts from being subjected to shear force, thus improving the reliability of the connection. The O-ring seal filled in the gap between the outer wall of the annular insert 10 and the inner wall of the relief groove 9 forms an independent annular seal for each bolt hole, effectively preventing coolant, oil mist, etc. from "creeping" along the bolt thread gap and invading into the motor, thus blocking the last possible leakage point.
[0039] Finally, the following points should be noted: In the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection" and "linkage" should be interpreted broadly, and can be mechanical or electrical connection, or internal connection between two components, or direct connection. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may change.
[0040] The electronic components and modules used in this utility model can all be parts that are commonly used in the market and can achieve the specific functions in this case. The specific models and sizes can be selected and adjusted according to actual needs.
[0041] The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.
Claims
1. A direct-drive CNC milling head interface sealing and protection device, comprising a spindle housing (1) and a direct-drive motor (2), characterized in that: The bottom of the spindle housing (1) and the top of the direct drive motor (2) are respectively fixedly connected to flange one (3) and flange two (4). The lower surface of flange one (3) is provided with an annular groove (6). The upper surface of flange two (4) is integrally formed with an annular protrusion (5) similar in shape to the annular groove (6). A sealing gasket similar in shape to both is installed between the annular protrusion (5) and the annular groove (6). An insert ring (8) is integrally formed at the inner edge of the lower edge of flange one (3), and the inner diameter of the insert ring (8) is the same as the inner diameter of flange one (3). The inner edge of the upper surface of flange two (4) is provided with an annular groove (7) that cooperates with the insert ring (8).
2. The direct-drive CNC milling head interface sealing and protection device according to claim 1, characterized in that: U-shaped annular grooves (11) are provided at the outer edge of the lower surface of flange one (3) and the outer edge of the upper surface of flange two (4). When flange one (3) and flange two (4) are fitted together, the two U-shaped annular grooves (11) form an H-shaped cavity, and an H-shaped retaining ring (12) is provided in the H-shaped cavity.
3. The direct-drive CNC milling head interface sealing and protection device according to claim 2, characterized in that: The top and bottom ends of the H-shaped retaining ring (12) are respectively attached to the inner walls of the U-shaped ring groove (11) on flange one (3) and flange two (4).
4. The direct-drive CNC milling head interface sealing and protection device according to claim 2, characterized in that: A sealing ring (13) is bonded between the H-shaped retaining ring (12) and the U-shaped ring groove (11).
5. The direct-drive CNC milling head interface sealing and protection device according to claim 1, characterized in that: The lower surface of flange one (3) is fixedly connected with downwardly extending annular inserts (10) at the edge of each mounting hole, and the upper surface of flange two (4) is provided with clearance grooves (9) that cooperate with the annular inserts (10) at the edge of each mounting hole.
6. The direct-drive CNC milling head interface sealing and protection device according to claim 1, characterized in that: The bottom of the annular groove (6) is also provided with at least one annular sealing groove.
7. A direct-drive CNC milling head interface sealing and protection device according to claim 5, characterized in that: There is a gap between the outer wall of the annular insert (10) and the inner wall of the recess groove (9), and the gap is filled with an O-ring seal.
8. The direct-drive CNC milling head interface sealing and protection device according to claim 1, characterized in that: A collision protection cover is also fitted at the outer edge of the mating joint between flange one (3) and flange two (4).