Sealing and protecting structure at front end of spindle of core moving machine

Abstract

The utility model discloses a front end sealing and protecting structure of a spindle of a core moving machine, which comprises a spindle core, a nut, a repair spacer ring and an angular contact ball bearing sleeved on the outer surface of the spindle core, a bearing seat sleeved on the outer surface of the angular contact ball bearing, a front end cover fixedly mounted on the right end face of the bearing seat, and a front end cover sleeved on the outer surface of the repair spacer ring. The front end cover is positioned on the bearing seat through a spigot, the left spigot end face of the front end cover exerts pretightening force on the outer ring of the angular contact ball bearing, a drainage hole C is formed under the front end cover, the protective cover is fixedly installed on the right end face of the front end cover, the protective cover is positioned on the front end cover through a spigot, and a drainage hole A and a drainage hole B are formed under the protective cover. The labyrinth seal structure formed by the first-stage seal, the second-stage seal, the third-stage seal, the fourth-stage seal, the fifth-stage seal and the sixth-stage seal is arranged at the front end of the main shaft of the core moving machine, so that the lubricating environment of the main shaft bearing cannot be influenced by foreign matters, and the service life of the main shaft bearing is prolonged; and the after-sales maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of power equipment, especially relates to a front end sealing protection structure of core bar machine main shaft. BACKGROUND

[0002] The existing core bar machine main shaft, in the numerical control machine tool processing, will have a large amount of iron filings, dust, high-pressure flushing cutting fluid splashing, and the core bar machine main shaft processing environment is relatively poor.Although the core bar machine main shaft head is provided with a protective sleeve to resist the cutting fluid from splashing into the main shaft interior, but the impurity gas may flow back into the main shaft head cavity and then into the main shaft interior, pollute the bearing, damage the bearing grease, and long-time operation of the main shaft may cause abnormal sound or jamming of the bearing, affecting the processing performance of the core bar machine main shaft.These problems have long affected the service life of the main shaft bearing.

[0003] The existing core bar machine main shaft on the market generally adopts the way of increasing the drain hole to prevent external foreign matters from entering the main shaft interior, but some core bar machine main shafts are often used for finish machining and long-time operation in poor environment, the gas mist produced by the cutting fluid covers the environment around the main shaft, the protection effect is not ideal, and there is still a relatively high failure rate due to the foreign matters entering the main shaft bearing.

[0004] Taking the core bar machine main shaft on the market as an example:

[0005] In order to improve the numerical control machine tool processing efficiency, a large amount of cutting fluid is used to cool the workpiece and tool in the poor processing condition.A large amount of iron filings, dust, high-pressure flushing cutting fluid splashes, and the way of increasing the drain hole is difficult to effectively protect.

[0006] For the core bar machine main shaft in the poor working condition, after the main shaft stops, the internal temperature is higher than the ambient temperature after the main shaft runs, and there is a pressure difference after cooling, and the gas mist around the machine tool may enter the main shaft head cavity and solidify into water droplets due to the pressure difference.If the cutting fluid or water droplets in the main shaft head cavity are not completely dried at this time, due to the capillary effect, the cutting fluid or water droplets may be sucked back into the main shaft interior, affect the bearing lubrication system, and damage the bearing.

[0007] In order to solve the above problems, the utility model provides a front end sealing protection structure of core bar machine main shaft. Utility model content

[0008] The utility model discloses a front end sealing protection structure of core bar machine main shaft, which can effectively prevent water from entering the front end interior of the core bar machine main shaft under poor working conditions, ensure that the bearing lubrication system is not affected, and guarantee the precision and performance of the core bar machine main shaft.

[0009] To solve the above technical problems, the utility model is realized by the following technical schemes:

[0010] The utility model discloses a kind of front end sealing protection structures of main shaft of core running machine, including shaft core, nut, repair spacer ring and angular contact ball bearing are respectively set with from right to left on the outer surface of shaft core, the outer ring of angular contact ball bearing is connected bearing seat, front end cover is fixedly installed on the right end surface of bearing seat, the front end cover is set on the outer surface of repair spacer ring, the front end cover is positioned on bearing seat with stop, the front end cover left stop end surface has pre-tightening force to the outer ring of angular contact ball bearing, drainage hole C is opened in the front end cover right below, protective cover is fixedly installed on the right end surface of the front end cover, the protective cover is set on the outer surface of nut, the protective cover is positioned on the front end cover with stop, drainage hole A and drainage hole B are opened in the lower of protective cover;

[0011] First annular cavity, second annular cavity are formed in order from right to left between the nut and protective cover, third annular cavity, fourth annular cavity, fifth annular cavity are formed in front of angular contact ball bearing between the front end cover and repair spacer ring.

[0012] Two labyrinth sealing gaps are formed from right to left in the circumferential direction between the nut and protective cover, and are first-stage sealing and second-stage sealing respectively, the first-stage sealing structure is radial comb-tooth type sealing structure, and the second-stage sealing structure is small-gap centrifugal type sealing protection structure;Four labyrinth sealing gaps are formed from right to left in the circumferential direction between the front end cover and repair spacer ring, and are third-stage sealing, fourth-stage sealing, fifth-stage sealing and sixth-stage sealing respectively, the fifth-stage sealing structure is radial comb-tooth type sealing structure, and the third-stage sealing, fourth-stage sealing and sixth-stage sealing structure are all small-gap centrifugal type sealing protection structure.

[0013] In one embodiment, the first annular cavity is located at the first trapezoidal ring groove from right to left between the nut and the protective cover;The second annular cavity is located at the second groove from right to left between the nut and the protective cover.

[0014] In one embodiment, the third annular cavity is located at the groove on the right end surface of the front end cover 5 between the front end cover and the repair spacer ring;The fourth annular cavity is located at the first trapezoidal ring groove from right to left between the front end cover and the repair spacer ring;The fifth annular cavity is located at the second trapezoidal ring groove from right to left between the repair spacer ring and the front end cover.

[0015] The utility model has the following beneficial effects:

[0016] In the utility model, through setting first stage seal, second stage seal, third stage seal, fourth stage seal, fifth stage seal and sixth stage seal at the front end of the main shaft of the core running machine, the labyrinth seal structure formed by the seal can not only protect the main shaft bearing from the influence of foreign matters on the lubricating environment of the bearing, prolong the service life of the main shaft bearing and reduce the after-sales maintenance cost, but also can effectively prevent water from entering the inside of the front end of the main shaft of the core running machine, ensure that the bearing lubricating system is not affected and guarantee the precision and performance of the main shaft of the core running machine.

[0017] Of course, it is not necessary for any product implementing the utility model to simultaneously achieve all the advantages mentioned above. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description, obviously, the drawings in the following description are only some embodiments of the utility model, and for the ordinary skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0019] Figure 1 It is a sectional structure schematic view of the front end sealing protection structure of the main shaft of a core running machine.

[0020] Figure 2 It is Figure 1 The middle part enlarged view.

[0021] In the drawings, the component list represented by each sign is as follows:

[0022] 1, shaft core;2, nut;3, protective cover;4, repair spacer ring;5, front end cover;6, bearing seat;7, angular contact ball bearing;8, drain hole A;9, drain hole B;10, drain hole C;11, first stage seal;12, second stage seal;13, third stage seal;14, fourth stage seal;15, fifth stage seal;16, sixth stage seal;17, first annular cavity;18, second annular cavity;19, third annular cavity;20, fourth annular cavity;21, fifth annular cavity. DETAILED DESCRIPTION

[0023] The technical scheme in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model, obviously, the described embodiments are only some embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor are within the protection scope of the utility model.

[0024] In the description of the utility model, it is necessary to understand that the terms "upper", "middle", "outer", "inner" and the like indicate the orientation or positional relationship, which is only for the convenience of describing the utility model and simplifying the description, and is not indicative or suggestive of the components or elements indicated having a specific orientation, being constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0025] In the description of the utility model, it should be noted that, unless otherwise expressly specified and limited, the terms "mounting", "provided with", "connection" and the like should be understood broadly, for example, "connection" can be fixed connection, can also be detachable connection, or integral connection, can be mechanical connection, can also be electrical connection, can be directly connected, can also be indirectly connected through an intermediate medium, and can be the communication between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0026] Please refer to Figures 1-2 As shown in the utility model is a kind of lead machine main shaft front end sealing protection structure, including shaft core 1, nut 2, repair spacer ring 4 and angular contact ball bearing 7 are respectively sleeved on the outer surface of shaft core 1 from right to left, angular contact ball bearing 7 outer ring is sleeved bearing seat 6, bearing seat 6 right end face is fixedly installed front end cover 5, front end cover 5 is sleeved on the outer surface of repair spacer ring 4, front end cover 5 is positioned on bearing seat 6 with stop, front end cover 5 left stop end face has pre-tightening force to the outer ring of angular contact ball bearing 7, front end cover 5 right end face is fixedly installed protective cover 3, protective cover 3 is sleeved on the outer surface of nut 2, protective cover 3 is positioned on front end cover 5 with stop, protective cover 3 is opened with drain hole A8 and drain hole B9 below;

[0027] First annular cavity 17, second annular cavity 18 are formed in sequence from right to left between nut 2 and protective cover 3, third annular cavity 19, fourth annular cavity 20, fifth annular cavity 21 are formed in front of angular contact ball bearing 7 between front end cover 5 and repair spacer ring 4;

[0028] First stage sealing 11 and second stage sealing 12 are formed in two labyrinth sealing gaps from right to left in the circumferential direction of nut 2 and protective cover 3, the structure of first stage sealing 11 is radial comb tooth type sealing structure, and the structure of second stage sealing 12 is small-gap centrifugal sealing protection structure;Third stage sealing 13, fourth stage sealing 14, fifth stage sealing 15 and sixth stage sealing 16 are formed in four labyrinth sealing gaps from right to left in the circumferential direction of front end cover 5 and repair spacer ring 4, the structure of fifth stage sealing 15 is radial comb tooth type sealing structure, and the structures of third stage sealing 13, fourth stage sealing 14 and sixth stage sealing 16 are all small-gap centrifugal sealing protection structures.

[0029] Further, the first annular cavity 17 is located between the nut 2 and the protective cover 3 at the first trapezoidal ring groove from right to left; the second annular cavity 18 is located between the nut 2 and the protective cover 3 at the second groove from right to left.

[0030] Further, the third annular cavity 19 is located between the front end cover 5 and the repair spacer ring 4 at the groove on the right end face of the front end cover 5; the fourth annular cavity 20 is located between the front end cover 5 and the repair spacer ring 4 at the first trapezoidal ring groove from right to left; the fifth annular cavity 21 is located between the repair spacer ring 4 and the front end cover 5 at the second trapezoidal ring groove from right to left.

[0031] Please refer to Figures 1-2 The working principle of the front end sealing protection structure of the main shaft of the core running machine is shown in the embodiment.

[0032] I. When the main shaft of the core running machine is working, the shaft core 1, the nut 2 and the repair spacer ring 4 at the front end of the main shaft are in a high-speed rotating state. The only way for external gas mist and impurities to enter the front end of the main shaft is through the gap between the rotating nut 2 and the non-rotating protective cover 3.

[0033] II. When the main shaft is rotating at high speed, a large amount of cutting fluid splashes into the sealing gap. The first-stage radial comb-shaped sealing structure formed by the nut 2 and the protective cover 3 at the front end can effectively block a large amount of splashing cutting fluid and impurities such as iron filings. The higher the speed of the main shaft, the better the protection effect. After the main shaft stops, the large sharp corner at the front end of the nut 2 can prevent the backflow of cutting fluid. At this moment, the comb-shaped sealing structure is invalid, but part of the cutting fluid is sucked into the first annular cavity 17 under the capillary effect. This is the primary protective sealing structure at the front end of the main shaft of the core running machine.

[0034] III. In the processing process, the material of the core machine stops working, the comb seal structure loses the ability to intercept and drain. After the main shaft stops in harsh working conditions, there is a large amount of gas mist in the environment where the core machine main shaft is located, and the splashed cutting fluid is accumulated into droplets in the sealing gap between the nut 2 and the protective cover 3. Due to the capillary effect, the cutting fluid can enter the first annular cavity 17 through the first sealing gap 11. The first annular cavity 17 is provided with a drain hole A8, so that the cutting fluid and impurities flowing into the first annular cavity 17 can flow out of the drain hole A8 at the first time, and only a small part of the cutting fluid remains on the cavity wall. When the cutting fluid passes through the first annular cavity 17 and enters the second sealing structure 12 formed by the nut 2 and the protective cover 3 at the front end, the second sealing structure 12 is a small-gap centrifugal sealing protection structure, and the sealing gap distance is between 0.15-0.20mm. The cutting fluid enters the second annular cavity 18 through the second sealing gap 12. The second annular cavity 18 is provided with a drain hole B9, so that the cutting fluid and impurities flowing into the second annular cavity 18 can flow out of the drain hole B9 at the first time. When the cutting fluid passes through the second annular cavity 18 and enters the third sealing structure 13 formed by the front end cover 5 and the repair spacer ring 4 between the front end cover 5, the third sealing structure 13 is a small-gap centrifugal sealing protection structure with a labyrinth structure, which loses kinetic energy and slows down the flow rate. The cutting fluid enters the third annular cavity 19 through the third sealing gap 13, and the kinetic energy is almost exhausted. A small amount of cutting fluid flows to the fourth sealing structure 14, which is a small-gap centrifugal sealing protection structure with a sealing gap distance of 0.15-0.2mm. The cutting fluid enters the fourth annular cavity 20 through the fourth sealing gap 14. The fourth annular cavity 20 is also called an expansion chamber and an oxygen collection tank. At this time, the gas mist is almost completely blocked and liquefied. The cutting fluid remaining in the fourth annular cavity 20 flows to the fifth sealing structure 15, which is a comb seal structure. The cutting fluid enters the fifth annular cavity 21 through the fifth sealing gap 15. The fourth annular cavity 20 is provided with a drain hole C10, so that the cutting fluid and impurities flowing into the fourth annular cavity 20 can flow out of the drain hole C10 at the first time. The gas loses kinetic energy and cannot continue to climb. The cutting fluid can only flow to the sixth sealing structure 16 through the fifth annular cavity 21. The sixth sealing structure 16 is a small-gap centrifugal sealing protection structure with a sealing gap distance of 0.15-0.20mm. The cutting fluid passing through the sixth sealing structure 16 can affect the bearing. The cutting fluid flowing to the sixth sealing structure 16 is almost zero, so that the inside of the front end of the core machine main shaft is protected. This is the sealing protection structure of the front end of the core machine main shaft.

[0035] In the description of the specification, the description of the terms "one embodiment", "an example", "a specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] The preferred embodiments of the utility model disclosed above are only used for helping to explain the utility model. The preferred embodiments do not describe all the details exhaustively, and also do not limit the utility model to only the specific implementation manners described. Obviously, according to the content of the specification, many modifications and changes can be made. The specification selects and specifically describes these embodiments, in order to better explain the principles and practical applications of the utility model, so that the persons skilled in the art can well understand and utilize the utility model. The utility model is limited only by the claims and the entire scope and equivalents thereof.

Claims

1. A front-end sealing protection structure of a main shaft of a core runner, comprising a shaft core (1), characterized in that: The outer surface of the shaft core (1) is respectively sleeved with a nut (2), a repair spacer ring (4) and an angular contact ball bearing (7) from right to left, the outer ring of the angular contact ball bearing (7) is sleeved with a bearing seat (6), the right end face of the bearing seat (6) is fixedly installed with a front end cover (5), the front end cover (5) is sleeved with the outer surface of the repair spacer ring (4), the front end cover (5) is positioned on the bearing seat (6) by a stop opening, the left stop opening end face of the front end cover (5) has a pre-tightening force on the outer ring of the angular contact ball bearing (7), a drainage hole C (10) is formed below the front end cover (5), a protective cover (3) is fixedly installed on the right end face of the front end cover (5), the protective cover (3) is sleeved with the outer surface of the nut (2), the protective cover (3) is positioned on the front end cover (5) by a stop opening, a drainage hole A (8) and a drainage hole B (9) are formed below the protective cover (3); The nut (2) and the protective cover (3) form a first annular cavity (17) and a second annular cavity (18) from right to left in sequence, the front end cover (5) and the repair spacer ring (4) form a third annular cavity (19), a fourth annular cavity (20) and a fifth annular cavity (21) in front of the angular contact ball bearing (7); The nut (2) and the protective cover (3) form two labyrinth sealing gaps in the circumferential direction from right to left, which are a first level sealing (11) and a second level sealing (12), the first level sealing (11) is a radial comb type sealing structure, and the second level sealing (12) is a small gap centrifugal sealing protection structure; The front end cover (5) and the repair spacer ring (4) form four labyrinth sealing gaps in the circumferential direction from right to left, which are a third level sealing (13), a fourth level sealing (14), a fifth level sealing (15) and a sixth level sealing (16), the fifth level sealing (15) is a radial comb type sealing structure, and the third level sealing (13), the fourth level sealing (14) and the sixth level sealing (16) are all small gap centrifugal sealing protection structures.

2. The front end seal protection structure of a main shaft of a core runner according to claim 1, wherein The first annular cavity (17) is located at the first trapezoidal ring groove between the nut (2) and the protective cover (3) from right to left; the second annular cavity (18) is located at the second groove between the nut (2) and the protective cover (3) from right to left.

3. The front end seal protection structure of a main shaft of a core runner according to claim 1, wherein The third annular cavity (19) is located at the right end face groove between the front end cover (5) and the repair spacer ring (4); the fourth annular cavity (20) is located at the first trapezoidal ring groove between the front end cover (5) and the repair spacer ring (4) from right to left; the fifth annular cavity (21) is located at the second trapezoidal ring groove between the repair spacer ring (4) and the front end cover (5) from right to left.

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