A rotary main shaft of a nuclear power plant valve sealing surface repair device

Abstract

The application discloses a rotating main shaft of a nuclear power plant valve sealing surface repairing device, which comprises a main shaft body, a shaft sleeve, a sliding sleeve, a locking piece and an air bag ring. The shaft sleeve is slidably sleeved on the main shaft body, the sliding sleeve is slidably sleeved on the main shaft body close to the outer end of the shaft sleeve, the locking piece is arranged on the outer side of the sliding sleeve and connected with the main shaft body to lock, so as to prevent the sliding sleeve from moving along the axial direction of the main shaft body; the air bag ring is arranged between the inner end of the shaft sleeve and the main shaft body, and the air bag ring is connected with an air source; the upper outer wall surface of the main shaft body is matched with the upper inner wall surface of the shaft sleeve, and both are conical surfaces; the outer wall surface of the sliding sleeve is matched with the lower inner wall surface of the shaft sleeve, and both are conical surfaces; and the upper outer wall surface of the main shaft body intersects with the extension line of the outer wall surface of the sliding sleeve at any point of the main shaft body. The rotating main shaft of the nuclear power plant valve sealing surface repairing device can reduce the friction caused by rotation, can bear larger radial load, double axial load and overturning moment, and can adapt to high-speed and high-rotation-precision places.

Description

Technical Field

[0001] This invention relates to the field of high-precision machining and testing technology, and in particular to a rotary spindle for a valve sealing surface repair device for nuclear power plants. Background Technology

[0002] The rotary spindle is the most crucial component of a machine tool, and its rotational accuracy directly determines the machining or inspection accuracy of the machine tool.

[0003] In the field of high-precision machining and inspection, most spindles use a ball bearing system, such as CNC valve polishing machines. When operating at high speeds, these spindles cannot withstand large radial loads, biaxial loads, and overturning moments. Moreover, the large application of ball bearings during rotation generates significant friction, which limits the spindle's maximum speed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a rotary spindle for a valve sealing surface repair device for nuclear power plants.

[0005] The technical solution adopted by this invention to solve its technical problem is: a rotary spindle of a valve sealing surface repair device for nuclear power plants, comprising a spindle body, a bushing, a sliding sleeve, a locking element, and an airbag ring. The bushing is slidably sleeved on the spindle body, and the sliding sleeve is slidably sleeved on the spindle body near the outer end of the bushing. The locking element is located on the outside of the sliding sleeve and is connected and locked to the spindle body to prevent the sliding sleeve from moving axially along the spindle body. The airbag ring is located between the inner end of the bushing and the spindle body, and the airbag ring is externally connected to an air source.

[0006] The upper outer wall surface of the main shaft body mates with the upper inner wall surface of the bushing, and both are conical surfaces; the outer wall surface of the sliding sleeve mates with the lower inner wall surface of the bushing, and both are conical surfaces.

[0007] The extension lines of the upper outer wall surface of the main shaft and the outer wall surface of the sliding sleeve intersect at any point on the main shaft.

[0008] Preferably, in the rotary spindle of the nuclear power plant valve sealing surface repair equipment of the present invention, the upper inner wall surface of the bushing has the same taper as the upper outer wall surface of the spindle body, and the outer wall surface of the sliding sleeve has the same taper as the lower inner wall surface of the bushing.

[0009] Preferably, in the rotary spindle of the nuclear power plant valve sealing surface repair equipment of the present invention, the rotary spindle of the nuclear power plant valve sealing surface repair equipment further includes a first protective sleeve and a second protective sleeve. The first protective sleeve is pressed between the upper outer wall surface of the spindle body and the upper inner wall surface of the bushing, and the second protective sleeve is pressed between the outer wall surface of the sliding sleeve and the lower inner wall surface of the bushing.

[0010] Preferably, in the rotary spindle of the nuclear power plant valve sealing surface repair equipment of the present invention, the bushing is provided with an air passage inside, the air passage penetrates the inner end face of the bushing and communicates with the airbag ring, and the air passage penetrates the outer side or outer end face of the bushing and is connected to an external air source.

[0011] Preferably, in the rotary spindle of the nuclear power plant valve sealing surface repair equipment of the present invention, the spindle body includes a spindle section, a first shaft section, a second shaft section and a third shaft section arranged in sequence. The diameter of the spindle section is greater than the maximum diameter of the first shaft section, the maximum diameter of the second shaft section is less than or equal to the minimum diameter of the first shaft section, and the maximum diameter of the third shaft section is less than the minimum diameter of the second shaft section.

[0012] The outer wall surface of the first shaft segment is a conical surface.

[0013] Preferably, in the rotary spindle of the nuclear power plant valve sealing surface repair equipment of the present invention, the bushing includes a main ring segment, a first ring segment and a second ring segment adjacent to the main ring segment, wherein the inner wall surface of the first ring segment is a conical surface and the inner wall surface of the second ring segment is a conical surface.

[0014] Preferably, in the rotary spindle of the nuclear power plant valve sealing surface repair equipment of the present invention, the rotary spindle of the nuclear power plant valve sealing surface repair equipment further includes an intermediate protective sleeve, which is disposed between the second shaft segment and the main body ring segment.

[0015] Preferably, in the rotary spindle of the nuclear power plant valve sealing surface repair equipment of the present invention, the rotary spindle of the nuclear power plant valve sealing surface repair equipment further includes a first elastic element and a second elastic element, the first elastic element is disposed between the sliding sleeve and the second shaft section, and the second elastic element is disposed between the sliding sleeve and the locking element.

[0016] Preferably, in the rotary spindle of the nuclear power plant valve sealing surface repair equipment of the present invention, the rotary spindle of the nuclear power plant valve sealing surface repair equipment further includes a thrust member, which is disposed between the locking member and the second elastic member to prevent the second elastic member from moving axially along the spindle body.

[0017] Preferably, in the rotary spindle of the nuclear power plant valve sealing surface repair equipment of the present invention, the rotary spindle of the nuclear power plant valve sealing surface repair equipment further includes at least one gasket, the gasket being disposed between the locking member and the thrust member.

[0018] By implementing this invention, the following beneficial effects are achieved:

[0019] The rotary spindle of the nuclear power plant valve sealing surface repair equipment of the present invention can reduce the friction caused by rotation, withstand large radial loads, biaxial loads and overturning moments, and can adapt to high-speed and high-precision operating environments. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0021] Figure 1 This is a schematic diagram of the rotating spindle structure of a nuclear power plant valve sealing surface repair device according to an embodiment of the present invention. Detailed Implementation

[0022] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0023] In the description of the invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of the invention, unless otherwise stated, "a plurality of" means two or more.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a chemical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] See Figure 1One embodiment of the present invention discloses a rotary spindle for a valve sealing surface repair device in a nuclear power plant, which is suitable for valve sealing surface repair equipment requiring high speed and high operating precision, thereby improving processing efficiency. It is understood that the use of the rotary spindle of the present invention in a nuclear power plant valve sealing surface repair device is only one example; in other embodiments, the rotary spindle can also be used in other similar machine tools requiring high speed and high operating precision, and should fall within the protection scope of the present invention.

[0026] The rotary spindle includes a spindle body 1, a bushing 2, a sliding sleeve 3, a locking element 4, an airbag ring 5, a first protective sleeve 61, an intermediate protective sleeve 62, and a second protective sleeve 63. The bushing 2 is slidably fitted onto the spindle body 1, and the first protective sleeve 61 is pressed between the upper outer wall surface 121 of the spindle body 1 and the upper inner wall surface 221 of the bushing 2. The sliding sleeve 3 is slidably fitted onto the spindle body 1 near the outer end of the bushing 2, and the second protective sleeve 63 is pressed between the outer wall surface of the sliding sleeve 3 and the lower inner wall surface 231 of the bushing 2. The locking element 4 is located on the outside of the sliding sleeve 3 and is connected and locked to the spindle body 1 to prevent the sliding sleeve 3 from moving axially along the spindle body 1.

[0027] An air bladder ring 5 is located between the inner end of the bushing 2 and the main shaft 1, and is connected to an external air source. The bushing 2 has an internal air passage 24 that penetrates the inner end face of the bushing 2 and communicates with the air bladder ring 5, and also penetrates the outer side or outer end face of the bushing 2 and is connected to an external air source. After compressed air is introduced into the air bladder ring 5, the rotating main shaft can significantly reduce the friction caused by rotation.

[0028] The upper outer wall surface 121 of the spindle body 1 mates with the upper inner wall surface 221 of the bushing 2, and both are conical surfaces. The outer wall surface of the sliding sleeve 3 mates with the lower inner wall surface 231 of the bushing 2, and both are conical surfaces. The extension lines of the upper outer wall surface 121 of the spindle body 1 and the outer wall surface of the sliding sleeve 3 intersect at any point on the spindle body 1, which can generate a thrust on the spindle body 1. This ensures that the rotary spindle can withstand large radial loads, biaxial loads, and overturning moments.

[0029] Furthermore, the upper inner wall surface 221 of the bushing 2 has the same taper as the upper outer wall surface 121 of the main shaft 1, and the outer wall surface of the sliding sleeve 3 has the same taper as the lower inner wall surface 231 of the bushing 2. Preferably, in some embodiments, the tapers of the upper inner wall surface 221 of the bushing 2, the upper outer wall surface 121 of the main shaft 1, the outer wall surface of the sliding sleeve 3, and the lower inner wall surface 231 of the bushing 2 are all the same, ensuring that a thrust is generated toward the axis of the main shaft 1, thereby ensuring that the rotary spindle can withstand large radial loads, biaxial loads, and overturning moments.

[0030] Furthermore, in some embodiments, the main shaft 1 includes a main shaft segment 11, a first shaft segment 12, a second shaft segment 13, and a third shaft segment 14 arranged sequentially. The diameter of the main shaft segment 11 is larger than the maximum diameter of the first shaft segment 12. The middle portion of the lower end face of the main shaft segment 11 is connected to the first shaft segment 12. The outer periphery of the lower end face of the main shaft segment 11 mates with the upper end face of the bushing 2, and the airbag ring 5 is placed therein. The maximum diameter of the second shaft segment 13 is less than or equal to the minimum diameter of the first shaft segment 12, and the maximum diameter of the third shaft segment 14 is less than the minimum diameter of the second shaft segment 13.

[0031] The outer wall surface of the first shaft segment 12 is conical, making the first shaft segment 12 a frustum. The second shaft segment 13 and the third shaft segment 14 are cylindrical, and the sliding sleeve 3 is slidably fitted onto the third shaft segment 14. Preferably, to facilitate the installation of the locking member 4 and its connection with external components, the main shaft body 1 may further include a fourth shaft segment 15 located after the third shaft segment 14 in some embodiments. The diameter of the fourth shaft segment 15 is smaller than the minimum diameter of the third shaft segment 14. The locking member 4 is preferably a nut, screwed onto the third shaft segment 14, which can limit the sliding range of the sliding sleeve 3.

[0032] Furthermore, in some embodiments, the bushing 2 includes a main ring segment 22, a first ring segment 21 and a second ring segment 23 adjacent to the main ring segment 22, respectively. The inner wall surface of the first ring segment 21 is a conical surface, and the inner wall surface of the second ring segment 23 is a conical surface. The main ring segment 22 is adjacent to the second shaft segment 13, and the intermediate protective sleeve 62 is disposed between the second shaft segment 13 and the main ring segment 22. To limit the intermediate protective sleeve 62, a limiting element, such as a screw, can be provided to interfere with the second shaft segment 13.

[0033] Furthermore, the rotary spindle also includes a first elastic element 71, a second elastic element 72, a thrust element 8, and a washer 9. The first elastic element 71 and the second elastic element 72 act as compressive loads. The first elastic element 71 is located between the sliding sleeve 3 and the second shaft segment 13, and the second elastic element 72 is located between the sliding sleeve 3 and the locking element 4. Preferably, both the first elastic element 71 and the second elastic element 72 are disc springs.

[0034] A thrust stop 8 is disposed between the locking member 4 and the second elastic member 72 to prevent the second elastic member 72 from moving axially along the main shaft 1, and a gasket 9 is disposed between the locking member 4 and the thrust stop 8. Preferably, the outer diameter of the thrust stop 8 is greater than or equal to the outer diameter of the sliding sleeve 3.

[0035] By implementing this invention, the following beneficial effects are achieved:

[0036] The rotary spindle of the nuclear power plant valve sealing surface repair equipment of the present invention can reduce the friction caused by rotation, withstand large radial loads, biaxial loads and overturning moments, and can adapt to high-speed and high-precision operating environments.

[0037] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that for those skilled in the art, the above embodiments or technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present invention. These all fall within the protection scope of the present invention. That is, the embodiments described "in some embodiments" can be freely combined with any of the embodiments above and below. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A rotary spindle for a valve sealing surface repair device in a nuclear power plant, characterized in that, The device includes a main shaft (1), a bushing (2), a sliding sleeve (3), a locking element (4), and an airbag ring (5). The bushing (2) is slidably sleeved on the main shaft (1), and the sliding sleeve (3) is slidably sleeved on the main shaft (1) near the outer end of the bushing (2). The locking element (4) is located on the outside of the sliding sleeve (3) and is connected and locked to the main shaft (1) to prevent the sliding sleeve (3) from moving axially along the main shaft (1). The airbag ring (5) is located between the inner end of the bushing (2) and the main shaft (1), and the airbag ring (5) is connected to an external air source. The upper outer wall surface (121) of the main shaft (1) is fitted with the upper inner wall surface (221) of the bushing (2), and both are conical surfaces. The outer wall surface of the sliding sleeve (3) is fitted with the lower inner wall surface (231) of the bushing (2), and both are conical surfaces. The upper outer wall surface (121) of the main shaft (1) and the extension line of the outer wall surface of the sliding sleeve (3) intersect at any point on the main shaft (1); Through the above-mentioned cooperation, the rotary spindle forms a structure that can withstand radial load, biaxial load and overturning moment. After compressed air is filled into the airbag ring (5), the rotary spindle reduces the friction caused by rotation.

2. The rotary spindle of the nuclear power plant valve sealing surface repair equipment according to claim 1, characterized in that, The upper inner wall surface (221) of the bushing (2) has the same taper as the upper outer wall surface (121) of the main shaft (1), and the outer wall surface of the sliding sleeve (3) has the same taper as the lower inner wall surface (231) of the bushing (2).

3. The rotary spindle of the nuclear power plant valve sealing surface repair equipment according to claim 2, characterized in that, The rotary spindle of the nuclear power plant valve sealing surface repair equipment also includes a first protective sleeve (61) and a second protective sleeve (63). The first protective sleeve (61) is pressed between the upper outer wall surface (121) of the spindle body (1) and the upper inner wall surface (221) of the bushing (2). The second protective sleeve (63) is pressed between the outer wall surface of the sliding sleeve (3) and the lower inner wall surface (231) of the bushing (2).

4. The rotary spindle of the nuclear power plant valve sealing surface repair equipment according to claim 1, characterized in that, The bushing (2) has an air passage (24) inside. The air passage (24) passes through the inner end face of the bushing (2) and communicates with the airbag ring (5). The air passage (24) also passes through the outer side or outer end face of the bushing (2) and is connected to an external air source.

5. The rotary spindle of the nuclear power plant valve sealing surface repair equipment according to claim 2, characterized in that, The main shaft (1) includes a main shaft segment (11), a first shaft segment (12), a second shaft segment (13) and a third shaft segment (14) arranged sequentially. The diameter of the main shaft segment (11) is greater than the maximum diameter of the first shaft segment (12), the maximum diameter of the second shaft segment (13) is less than or equal to the minimum diameter of the first shaft segment (12), and the maximum diameter of the third shaft segment (14) is less than the minimum diameter of the second shaft segment (13). The outer wall surface of the first shaft segment (12) is a conical surface.

6. The rotary spindle of the nuclear power plant valve sealing surface repair equipment according to claim 5, characterized in that, The bushing (2) includes a main ring segment (22), a first ring segment (21) and a second ring segment (23) adjacent to the main ring segment (22), the inner wall surface of the first ring segment (21) is a conical surface, and the inner wall surface of the second ring segment (23) is a conical surface.

7. The rotary spindle of the nuclear power plant valve sealing surface repair equipment according to claim 6, characterized in that, The rotary spindle of the nuclear power plant valve sealing surface repair equipment also includes an intermediate protective sleeve (62), which is located between the second shaft section (13) and the main body ring section (22).

8. The rotary spindle of the nuclear power plant valve sealing surface repair equipment according to any one of claims 5-7, characterized in that, The rotary spindle of the nuclear power plant valve sealing surface repair equipment also includes a first elastic element (71) and a second elastic element (72). The first elastic element (71) is located between the sliding sleeve (3) and the second shaft segment (13), and the second elastic element (72) is located between the sliding sleeve (3) and the locking element (4).

9. The rotary spindle of the nuclear power plant valve sealing surface repair equipment according to claim 8, characterized in that, The rotary spindle of the nuclear power plant valve sealing surface repair equipment also includes a thrust member (8), which is located between the locking member (4) and the second elastic member (72) to prevent the second elastic member (72) from moving axially along the spindle body (1).

10. The rotary spindle of the nuclear power plant valve sealing surface repair equipment according to claim 9, characterized in that, The rotary spindle of the nuclear power plant valve sealing surface repair equipment also includes at least one gasket (9), which is located between the locking member (4) and the thrust member (8).

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