A water sandblasting rust removal equipment for mechanical parts with curved inner cavity

Abstract

The application discloses a water sand blasting rust removal equipment for a mechanical part with a curved inner cavity, which comprises a large ball valve body to be rust removed, flange plates at two ends of the ball valve body, and a spherical curved surface of an inner cavity wall of the ball valve body to be rust removed; and a rust removal device based on water sand blasting, wherein the lower end of the rust removal device based on water sand blasting is a water sand mixed liquid spraying unit; the distance between the spraying port and the local part to be sprayed of the spherical curved surface is kept consistent at any time, so that the spraying intensity received by any part to be sprayed of the spherical curved surface is consistent, the uniformity of spraying is ensured, and the spherical surface integrity after rust removal is improved.

Description

Technical Field

[0001] This invention belongs to the field of rust removal from the internal cavity of ball valves. Background Technology

[0002] Rust removal from the internal cavity of large ball valve bodies is a major maintenance item. Water blasting is characterized by being dust-free, clean, and environmentally friendly, and causing less damage to the inner wall of the valve body cavity. Therefore, it is commonly used in the rust removal process for the internal cavity of valve bodies.

[0003] Because the inner cavity of a large ball valve body has a spherical curved surface, in current practices, workers typically use a handheld spray nozzle to probe into the inner cavity and perform water jet sandblasting on the spherical inner wall of the valve body. However, this manual method cannot guarantee the distance between the water jet nozzle and the area being sprayed on the spherical inner wall of the valve body. This results in inconsistent spray intensity received by different areas of the spherical inner wall, making it impossible to ensure uniform spraying. If the distance between the nozzle and the area being sprayed is too small, there is a risk of excessive localized spray intensity damaging the inner wall of the spherical inner wall of the valve body. Summary of the Invention

[0004] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides a water-jet sandblasting rust removal device for mechanical parts with curved internal cavities, which ensures that the spray intensity received at any sprayed part of the spherical curved surface is consistent.

[0005] Technical solution: To achieve the above objectives, the present invention provides a water-blasting sandblasting rust removal device for curved internal cavity mechanical parts, comprising a ball valve body, wherein the inner wall of the inner cavity of the ball valve body to be rusted is a spherical curved surface; comprising a water-blasting sandblasting rust removal device, wherein the lower end of the water-blasting sandblasting rust removal device is a water-sand mixed liquid spraying unit, wherein when the ball valve body is placed in a vertical position, the water-sand mixed liquid spraying unit at the lower end of the water-blasting sandblasting rust removal device can extend downward into the center position of the inner cavity of the ball valve body.

[0006] Furthermore, the water-sand mixture injection unit includes a vertical probe, the lower end of which is connected to the water-sand mixture injection unit, and the upper end is connected to the liquid inlet connector. An external high-pressure water-sand mixture supply pipe is connected to the vertical probe through the liquid inlet connector.

[0007] A limiting disc is fixed coaxially on the outer wall of the vertical probe. When the limiting disc is coaxially attached to the flange end face of the ball valve body, the geometric center of the water-sand mixture injection unit coincides with the center of the spherical surface.

[0008] Furthermore, the water-sand mixed liquid injection unit includes an annular wall; the nozzle is fixed to the outer wall of the annular wall, and the end of the nozzle is an injection port along the radial direction of the annular wall.

[0009] Furthermore, an electronic valve is installed inside the nozzle.

[0010] Furthermore, the water-sand mixed liquid injection unit also includes a central seat within the area enclosed by the ring wall; the inner wall of the ring wall is a scaled-down version of the spherical surface; when the geometric center of the water-sand mixed liquid injection unit coincides with the center of the spherical surface, the scaled-down spherical surface coincides with the center of the spherical surface; the central seat is fixedly connected to the lower end of the vertical probe; several universal ball bearing seats are fixedly installed on the outer periphery of the central seat through several connecting arms, and the universal balls on each universal ball bearing seat roll in cooperation with the scaled-down spherical surface. Under the constraint of the several universal balls, the ring wall rotates freely around the center of the scaled-down spherical surface.

[0011] Furthermore, it also includes two drive units that drive the first drive wheel and the second drive wheel respectively, with the two drive units symmetrical on both sides of the central seat.

[0012] Furthermore, a spatial coordinate system xyz is established with the center of the spherical surface as the origin O; a first drive wheel and a second drive wheel, which can actively rotate along the axis, are symmetrically arranged on both sides of the origin O on the x-axis. The wheel surfaces of the first drive wheel and the second drive wheel are closely fitted and pressed against the scaled-down spherical surface and roll in cooperation.

[0013] Both drive units consist of an x-direction telescopic device, an x-axis brake motor, a rocker arm, and a brake roller drive motor.

[0014] The x-direction telescopic device is fixed on the center seat. The end of the x-direction telescopic rod of the x-direction telescopic device is fixedly connected to the x-axis brake motor. The axis of the x-output shaft of the x-axis brake motor is coincident with the x-axis. The x-output shaft is fixedly connected to the brake roller drive motor through a rocker arm. The output shaft of the brake roller drive motor is coaxially connected to the first drive wheel / second drive wheel.

[0015] When the axes of the first drive wheel and the second drive wheel are both parallel to the y-axis, the synchronous rotation of the first drive wheel and the second drive wheel causes the ring wall to rotate around the y-axis under the action of rolling friction.

[0016] When the axes of the first and second drive wheels are both parallel to the z-axis, the synchronous rotation of the first and second drive wheels causes the ring wall to rotate around the z-axis under the action of rolling friction.

[0017] Furthermore, a liquid guiding channel is provided inside the annular wall, and the outlet end of the liquid guiding channel is connected to the nozzle; the lower end of the vertically inserted tube channel is rotatably connected to a rotating liquid guiding tube through a sealed bearing; the lower end of the rotating liquid guiding tube is connected to the inlet end of the liquid guiding channel through a flexible liquid guiding tube.

[0018] Beneficial effects: Under the constraints of the reduced-size spherical surface and each universal ball bearing, the distance between the blasting nozzle and the blasted part of the spherical surface remains consistent at any time during the entire process of sandblasting and rust removal. Therefore, it ensures that the blasting intensity received at any blasted part of the spherical surface is consistent, thereby ensuring the uniformity of blasting and improving the integrity of the spherical surface after rust removal. Attached Figure Description

[0019] Appendix Figure 1 The valve body structure is for large ball valves;

[0020] Appendix Figure 2 This is a schematic diagram of a rust removal device based on water blasting that has not yet been integrated with a large ball valve.

[0021] Appendix Figure 3 This is a cross-sectional view of a water-blasting-based rust removal device used in conjunction with a large ball valve.

[0022] Appendix Figure 4 This is a schematic diagram of a rust removal device based on water blasting.

[0023] Appendix Figure 5 A schematic diagram of the first cross-sectional structure of the water-sand mixed liquid jetting unit;

[0024] Appendix Figure 6 This is a schematic diagram of the second cross-section of the water-sand mixed liquid jetting unit.

[0025] Appendix Figure 7 This is a schematic diagram of the third section of the water-sand mixed liquid jetting unit.

[0026] Appendix Figure 8 This is a schematic diagram of the water-sand mixed liquid jetting unit with the annular wall hidden. Detailed Implementation

[0027] The invention will now be further described with reference to the accompanying drawings.

[0028] As attached Figures 1 to 8 The image shows a water-blasting sandblasting rust removal device for curved internal cavity mechanical parts, such as... Figure 1 It includes a large ball valve body 1 to be derusted, with flanges 3 at both ends, and the inner wall of the inner cavity of the ball valve body 1 to be derusted being a spherical curved surface 41; it also includes a water-blasting based derusting device 2, the lower end of which is a water-sand mixed liquid spraying unit 2.1.

[0029] like Figure 2 and 3When the ball valve body 1 is placed in a vertical position, the water-sand mixture injection unit 2.1 at the lower end of the water-blasting sandblasting rust removal device 2 can extend downward into the center of the ball in the inner cavity of the ball valve body 1, and the drive structure drives the nozzle 15 on the water-sand mixture injection unit 2.1 to rotate around the center of the spherical surface 41.

[0030] The water-sand mixture injection unit 2.1 includes a vertical probe 13. The lower end of the vertical probe 13 is connected to the water-sand mixture injection unit 2.1, and the upper end is connected to the liquid inlet connector 80. The external high-pressure water-sand mixture supply pipe is connected to the vertical probe 13 through the liquid inlet connector 80.

[0031] like Figure 4 A limiting disc 44 is coaxially fixed to the outer wall of the vertical probe 13. When the limiting disc 44 is coaxially attached to the end face of the flange 3 of the ball valve body 1, such as Figure 3 The geometric center of the water-sand mixed liquid spraying unit 2.1 coincides with the center of the sphere of the spherical surface 41.

[0032] like Figure 5 , 6 7. The water-sand mixed liquid injection unit 2.1 includes an annular wall 10; a nozzle 15 is fixed on the outer wall of the annular wall 10, and the end of the nozzle 15 is an injection port 5 along the radial direction of the annular wall 10; an electronic valve is provided inside the nozzle 15.

[0033] The water-sand mixed liquid injection unit 2.1 also includes a central seat 14 within the area enclosed by the annular wall 10; the inner wall of the annular wall 10 is a scaled-down version of the spherical surface 9, which is proportionally reduced from the spherical surface 41; when the geometric center of the water-sand mixed liquid injection unit 2.1 coincides with the center of the spherical surface 41, the scaled-down spherical surface 9 coincides with the center of the spherical surface 41; the central seat 14 is fixedly connected to the lower end of the vertical probe tube 13; several universal ball bearing seats 17 are fixedly installed on the outer periphery of the central seat 14 through several connecting arms 18, and the universal balls 16 on each universal ball bearing seat 17 are in rolling engagement with the scaled-down spherical surface 9. Under the constraint of the several universal balls 16, the annular wall 10 can rotate freely around the center of the scaled-down spherical surface 9;

[0034] like Figure 2 A spatial coordinate system xyz is established with the center of the sphere 41 as the origin O. A first drive wheel 4a and a second drive wheel 4b that can actively rotate along the axis are symmetrically arranged on both sides of the origin O on the x-axis. The wheel surfaces of the first drive wheel 4a and the second drive wheel 4b are closely fitted and pressed against the scaled-down sphere 9 and roll in cooperation.

[0035] When the axes of the first drive wheel 4a and the second drive wheel 4b are both parallel to the y-axis, the synchronous rotation of the first drive wheel 4a and the second drive wheel 4b causes the ring wall 10 to rotate around the y-axis under the action of rolling friction.

[0036] When the axes of the first drive wheel 4a and the second drive wheel 4b are both parallel to the z-axis, the synchronous rotation of the first drive wheel 4a and the second drive wheel 4b causes the ring wall 10 to rotate around the z-axis under the action of rolling friction.

[0037] like Figure 8 It also includes two drive units 51 that drive the first drive wheel 4a and the second drive wheel 4b respectively, and the two drive units 51 are symmetrical about the two sides of the center seat 14.

[0038] like Figure 7 and 8 Both drive units 51 consist of an x-direction telescopic device 8, an x-axis brake motor 12, a rocker arm 21, and a brake roller drive motor 22.

[0039] The x-direction telescopic device 8 is fixed on the center seat 14. The end of the x-direction telescopic rod 19 of the x-direction telescopic device 8 is fixedly connected to the x-axis brake motor 12. The axis of the x-output shaft 20 of the x-axis brake motor 12 coincides with the x-axis. The x-output shaft 20 is fixedly connected to the brake roller drive motor 22 through the rocker arm 21. The output shaft of the brake roller drive motor 22 is coaxially connected to the first drive wheel 4a / second drive wheel 4b.

[0040] A liquid guiding channel 24 is provided inside the annular wall 10, and the outlet end of the liquid guiding channel 24 is connected to the nozzle 15; the lower end of the tube channel 45 inside the vertical probe tube 13 is rotatably connected to the rotating liquid guiding tube 7 through the sealing bearing 40; the lower end of the rotating liquid guiding tube 7 is connected to the inlet end of the liquid guiding channel 24 through the flexible liquid guiding tube 6.

[0041] Working principle: Initial state settings of water-sand mixed liquid injection unit 2.1:

[0042] In the initial state: the axes of the first drive wheel 4a and the second drive wheel 4b are both parallel to the z-axis, and the x-axis brake motor 12 and the brake roller drive motor 22 on the two drive units 51 are both in a braking state; the ring wall 10 remains stationary under the static friction constraint of the first drive wheel 4a and the second drive wheel 4b in the braking state.

[0043] Positioning before sandblasting: Place the ball valve body 1 vertically, then extend the water-sand mixture injection unit 2.1 at the lower end of the water-blasting rust removal device 2 into the inner cavity of the ball valve body 1, and make the limiting plate 44 coaxially fit against the end face of the flange 3 of the ball valve body 1. At this time, the geometric center of the water-sand mixture injection unit 2.1 coincides with the center of the spherical surface 41, and then make the reduced spherical surface 9 coincide with the center of the spherical surface 41. The positioning of the water-sand mixture injection unit 2.1 is now complete. Finally, fix the limiting plate 44 with the fixing device.

[0044] Sandblasting process:

[0045] Open the valve on the nozzle 15, and the external high-pressure water-sand mixture supply pipe will press the high-pressure water-sand mixture liquid into the pipe channel 45 inside the vertical probe pipe 13 through the liquid inlet connector 80. Finally, the end of the nozzle 15 will be the spray port 5 along the radial direction of the ring wall 10, continuously spraying the water-sand mixture liquid in the form of a high-speed jet onto a local area of ​​the spherical surface 41, and removing the rust spots in the local area of ​​the spherical surface 41 that is sprayed.

[0046] Simultaneously, the two brake-type roller drive motors 22 are controlled to make the first drive wheel 4a and the second drive wheel 4b rotate synchronously. The synchronous rotation of the first drive wheel 4a and the second drive wheel 4b drives the ring wall 10 to rotate under the action of rolling friction. The spray nozzle 5 follows the movement of the ring wall 10, thereby causing the spray nozzle 5 to spray a high-speed jet of water and sand mixture liquid to form a continuous rust-removed band on the spherical surface 41. At the same time, the x-axis brake motors 12 of the two drive units 51 are synchronously controlled to make the two x-output shafts 20 rotate synchronously and adaptively. This causes the first drive wheel 4a and the second drive wheel 4b to rotate along their own axes while also deflecting along the x-axis, thereby changing the spray elevation angle of the spray nozzle 5 in real time. Based on the synchronous rotation of the first drive wheel 4a and the second drive wheel 4b along their own axes to drive the ring wall 10 to rotate, the synchronous adaptive rotation of the two x-output shafts 20 is controlled in real time to change their spray elevation angle, so that the spray nozzle 5 can theoretically spray any area of ​​the spherical surface 41, thereby achieving the purpose of comprehensive rust removal of the spherical surface 41.

[0047] Under the constraints of the reduced-size spherical surface 9 and each universal ball bearing 16, the distance between the spray nozzle 5 and the sprayed part of the spherical surface 41 remains consistent at any given time during the entire sandblasting process. This ensures that the spray intensity received at any sprayed part of the spherical surface 41 is consistent, thereby ensuring the uniformity of the spray and improving the integrity of the spherical surface 41 after rust removal.

[0048] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A water-blasting derusting device for a mechanical part with a curved inner cavity, comprising a ball valve body (1), the inner cavity wall of the ball valve body (1) to be derusted is a spherical curved surface (41); characterized in that: The device comprises a water sand blasting based rust removal device (2), the lower end of the water sand blasting based rust removal device (2) is a water sand mixed liquid spraying unit (2.1), and the water sand mixed liquid spraying unit (2.1) at the lower end of the water sand blasting based rust removal device (2) can extend into the ball center position of the inner cavity of the ball valve body (1) when the ball valve body (1) is vertically placed. The water sand mixed liquid spraying unit (2.1) comprises a vertical probe pipe (13), the lower end of the vertical probe pipe (13) is connected with the water sand mixed liquid spraying unit (2.1), the upper end is connected with a liquid inlet connector (80), and an external high-pressure water sand mixture supply pipe is communicated with the vertical probe pipe (13) through the liquid inlet connector (80); the water sand mixed liquid spraying unit (2.1) comprises a ring wall (10); a nozzle (15) is fixed to the outer wall of the ring wall (10), and the tail end of the nozzle (15) is a spraying port (5) in the radial direction of the ring wall (10). The water sand mixed liquid spraying unit (2.1) further comprises a central seat (14) within the range enclosed by the ring wall (10); the inner wall of the ring wall (10) is a reduced version of the spherical surface (41), that is, a reduced spherical surface (9); when the geometric center of the water sand mixed liquid spraying unit (2.1) coincides with the ball center of the spherical surface (41), the reduced spherical surface (9) coincides with the ball center of the spherical surface (41); the central seat (14) is fixedly connected to the lower end of the vertical probe pipe (13); the outer periphery of the central seat (14) is fixedly provided with a plurality of universal ball seats (17) through a plurality of connecting arms (18), the universal ball bearings (16) on each universal ball seat (17) are in rolling fit with the reduced spherical surface (9), and the ring wall (10) is freely rotatable around the ball center of the reduced spherical surface (9) under the constraint of the plurality of universal ball bearings (16). Further comprising two drive units (51) for driving the first drive wheel (4a) and the second drive wheel (4b) respectively, and the two drive units (51) are symmetrically arranged on the two sides of the central seat (14). A space coordinate system xyz is established with the ball center of the spherical surface (41) as the origin O; the first drive wheel (4a) and the second drive wheel (4b) capable of being actively rotated along the axis are symmetrically arranged on the two sides of the origin O on the x-axis, and the wheel surfaces of the first drive wheel (4a) and the second drive wheel (4b) are in close contact with the reduced spherical surface (9) and are in rolling fit; Each of the two drive units (51) is composed of an x-direction extender (8), an x-axis brake motor (12), a rocker arm (21) and a brake roller drive motor (22); The x-direction extender (8) is fixed on the central seat (14), the x-direction extender (8) is fixedly connected with the x-axis brake motor (12) at the tail end of the x-direction extender (8), the axis of the x output shaft (20) of the x-axis brake motor (12) coincides with the x-axis; the x output shaft (20) is fixedly connected with the brake roller drive motor (22) through the rocker arm (21), and the output shaft of the brake roller drive motor (22) is coaxially connected with the first drive wheel (4a) / second drive wheel (4b).

2. A water-blast gritting apparatus for the removal of rust from a curved internal cavity of a mechanical part as claimed in claim 1, wherein: The outer wall of the vertical probe pipe (13) is fixedly provided with a limiting disc (44) coaxially, when the limiting disc (44) is attached to the end face of the flange disc (3) of the ball valve body (1), the geometric center of the water-sand mixed liquid injection unit (2.1) is just coincident with the ball center of the spherical surface (41).

3. A water-blast gritting apparatus for the removal of rust from a curved internal cavity of a mechanical part as claimed in claim 2, wherein: An electronic valve is arranged in the nozzle (15).

4. A water-blast gritting apparatus for the removal of rust from a curved internal cavity of a mechanical part as claimed in claim 3, wherein: When the axes of the first driving wheel (4a) and the second driving wheel (4b) are both parallel to the y-axis, the synchronous rotation of the first driving wheel (4a) and the second driving wheel (4b) drives the ring wall (10) to rotate around the y-axis under the action of the rolling friction; When the axes of the first driving wheel (4a) and the second driving wheel (4b) are both parallel to the z-axis, the synchronous rotation of the first driving wheel (4a) and the second driving wheel (4b) drives the ring wall (10) to rotate around the z-axis under the action of the rolling friction.

5. A water-blast gritting apparatus for the removal of rust from a curved internal cavity mechanical part as claimed in claim 4, wherein: A liquid guide channel (24) is arranged in the ring wall (10), the liquid outlet end of the liquid guide channel (24) is communicated with the nozzle (15); the lower end of the in-pipe channel (45) in the vertical probe pipe (13) is rotatably sleeved with a rotating liquid guide pipe (7) through a sealing bearing (40); the lower end of the rotating liquid guide pipe (7) is communicated with the liquid inlet end of the liquid guide channel (24) through a flexible liquid guide pipe (6).

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