Shot blasting internal derusting and anti-breakdown device for steel straight pipe fitting with elbow and application method of shot blasting internal derusting and anti-breakdown device

Abstract

According to the shot blasting internal rust removal and puncture prevention device for the steel straight pipe fitting with the elbow and the application method, the shot blasting internal rust removal and puncture prevention device for the steel straight pipe fitting with the elbow enables a movement mechanism to move when the elbow part of the pipe fitting is subjected to shot blasting impact force through coordination and cooperation of linear reciprocating motion and rotary swinging motion, and the shot blasting internal rust removal and puncture prevention device for the steel straight pipe fitting with the elbow is achieved. Excessive impact energy is absorbed, so that the damage and damage of the impact force to the bent pipe part of the pipe fitting are eliminated or reduced; the linear motion mechanism performs linear motion under the action of impact force, and the rotary motion mechanism performs rotary motion under the action of impact force; and the buffer reset device enables the pipe fitting and the movement mechanism to recover to the initial position after being impacted to move.

Description

Technical Field

[0001] The invention relates to the technical field of internal rust removal of steel straight pipe fittings with elbows, in particular to a device for shot peening internal rust removal and anti-breakdown of steel straight pipe fittings with elbows and an application method. Background Art

[0002] The piping systems of FPSO platforms for offshore oil and gas extraction operations and the piping systems of petrochemical plants are inseparable from special-shaped steel pipe fittings. There are many types of special-shaped steel pipe fittings, among which the steel straight pipe fittings with an elbow at one end are the most common. Since the conveying medium and service conditions are corrosive to steel pipe fittings, steel special-shaped pipe fittings need to be coated with anti-corrosion paint on the inner wall before installation and use, and rust removal on the inner wall of the pipe fittings before painting is a necessary process step for painting. In factory painting operations, shot blasting or sand blasting is the most widely used rust removal method.

[0003] Since the steel straight pipe fittings with elbows are special-shaped pipe fittings, in actual production, the pipe fittings are placed on a workbench and manually operated by the shot peening device to process them piece by piece. Since the elbow part of the pipe fitting will change the angle between the steel shot jet 5 and the pipe wall during the shot peening process of the nozzle 4, such as Figures 1 to 3 As shown in the figure, the primary and secondary steel shot jets vertically strike and over-impact the curved pipe section, causing the outer wall thickness of the curved pipe section to be thinned. In severe cases, the pipe wall is punctured, causing the performance of the pipe fitting to deteriorate or even become scrapped. Summary of the invention

[0004] The object of the present invention is to provide a shot peening and rust removal device for steel straight pipe fittings with elbows and an application method thereof, which can eliminate or reduce the vertical impact and excessive impact of the jet on the curved pipe section in the prior art and protect the curved pipe section.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A device for shot peening and removing rust inside a steel straight pipe fitting with an elbow to prevent breakdown, which is used for shot peening and removing rust on the straight pipe fitting with an elbow, and comprises a linear motion mechanism, a rotary motion mechanism and a buffer reset device;

[0007] The linear motion mechanism comprises a double-track track and a pipe-carrying trolley, wherein the pipe-carrying trolley is rollingly arranged on the double-track track to provide a carrier for reciprocating motion;

[0008] The rotary motion mechanism is rotatably arranged above the pipe-carrying trolley, and the straight pipe with elbow is mounted on the rotary motion mechanism through a fixing member, and the rotary motion mechanism is used to provide a carrier for rotary and pendulum motion;

[0009] The buffer reset device includes a buffer reset device 1 and a buffer reset device 2; the buffer reset device 1 is arranged on one side of the pipe carrying trolley, and is used to provide reverse elastic traction resistance when the pipe carrying trolley rolls on the double-track track; the buffer reset device 2 is connected to the linear motion mechanism and the rotary motion mechanism, and is used to provide reverse elastic traction resistance when the rotary motion mechanism rotates on the linear motion mechanism.

[0010] Preferably, the pipe-carrying trolley comprises a rectangular work surface and a work frame; the bottom of the work frame is rolled on the double-track track by rollers, and a rectangular work table is installed on the top of the work frame;

[0011] The rotary motion mechanism includes a circular plane rotating table, a central axis, a plane thrust bearing and a pipe fastener; the circular plane rotating table is rotationally connected to the rectangular worktable through the central axis and the plane thrust bearing, one end of the central axis is fixed at the center of the rectangular worktable, and the other end of the central axis is connected to the center of the circular plane rotating table through a bearing, and the circular plane rotating table rotates smoothly relative to the rectangular worktable through the central axis combined with the plane thrust bearing.

[0012] Preferably, the plane thrust bearing comprises an annular base and an annular pressure cover, wherein the annular base is arranged at the center of the rectangular work surface, and the center of the annular base coincides with the center projection of the rectangular work surface; the annular pressure cover is arranged at the bottom of the circular plane rotating table, and the center of the annular pressure cover coincides with the center projection of the circular plane rotating table, and a plurality of balls are arranged between the annular base and the annular pressure cover. The circular plane rotating table can rotate freely relative to the rectangular work surface by connecting with the plane thrust bearing.

[0013] Preferably, the straight pipe fitting with an elbow is fixed to the circular plane rotating table by a pipe fitting fastener, which is used to fix the straight pipe fitting with an elbow during the processing.

[0014] Preferably, the pipe fastener comprises two symmetrically arranged pipe fixing members, the two pipe fixing members are symmetrically arranged on both sides of the center of the circular plane rotating table and are located on the same diameter of the circular plane rotating table.

[0015] Preferably, the buffer reset device 1 includes a spring 1 and a fixed block, the fixed block is fixed on the ground on one side of the pipe-carrying trolley, and the fixed block and the pipe-carrying trolley are connected through a spring 1; when the pipe-carrying trolley rolls and displaces on the double-track track, the spring 1 provides an elastic traction resistance opposite to the rolling direction of the pipe-carrying trolley, so that the pipe-carrying trolley exhibits a linear reciprocating motion on the double-track track;

[0016] The second buffer reset device includes a second spring and two fixed ends, the two fixed ends are respectively arranged on the rectangular work table and the circular plane rotating table, and the two fixed ends are connected by the second spring; when the circular plane rotating table rotates on the rectangular work table, the second spring provides an elastic traction resistance opposite to the rotation direction of the circular plane rotating table, so that the circular plane rotating table exhibits a swinging motion on the rectangular work table.

[0017] The present invention also provides an application method of a device for shot peening and removing rust and preventing breakdown of a steel straight pipe fitting with an elbow, comprising the following steps:

[0018] Step S1: Assemble and place the pipe-carrying trolley:

[0019] Step S11: placing the bottom of the pipe-carrying trolley on the double-track track through rollers, so that the pipe-carrying trolley can flexibly move forward and backward on the double-track track;

[0020] Step S12: The circular plane rotating table of the rotary motion mechanism is rotatably connected to the rectangular worktable of the linear motion mechanism through a central axis and a plane thrust bearing, and the circular plane rotating table of the rotary motion mechanism can rotate freely on the rectangular worktable;

[0021] Step S2: Install the buffer reset device:

[0022] Step S21: Install the buffer reset device 1: install the fixed block on the ground at one end of the pipe-carrying trolley, the installation position of the fixed block is opposite to the initial rolling direction of the pipe-carrying trolley, and then connect the two ends of the spring 1 to the fixed block and the working platform of the pipe-carrying trolley respectively; when the pipe-carrying trolley rolls and displaces on the double-track track, the spring 1 provides an elastic traction resistance opposite to the rolling direction of the pipe-carrying trolley, so that the pipe-carrying trolley presents a linear reciprocating motion on the double-track track;

[0023] Step S22: Install the buffer reset device 2: The two fixed ends are respectively installed on the rectangular work table and the circular plane rotating table, and the two fixed ends are connected by a second spring. When the circular plane rotating table rotates on the rectangular work table, the second spring provides an elastic traction resistance in the opposite direction of the rotation direction of the circular plane rotating table, so that the circular plane rotating table exhibits a swinging motion on the rectangular work table;

[0024] Step S3: Place the workpiece for processing:

[0025] Step S31: placing the straight pipe fitting with elbow to be processed on a circular plane rotating table, wherein the elbow end and the straight pipe end of the straight pipe fitting with elbow are both located on or outside the outer circle line of the circular rotating table;

[0026] Step S32: Then, two pipe fasteners are used to fix the straight pipe fittings with elbows on the circular plane rotating table, so that there is no relative movement between the straight pipe fittings with elbows and the circular plane rotating table;

[0027] Step S4: Processing:

[0028] Step S41: Sending the shot blasting gun head from the straight pipe end of the straight pipe fitting with elbow into the pipe fitting until the elbow portion;

[0029] Step S42: Start the shot peening gun to start shot peening. During the shot peening operation, when the straight pipe fitting with elbow is shot peened and rust removed, it is impacted by the secondary steel shot jet. The straight pipe fitting with elbow drives the pipe fitting carrying trolley to roll and displace through the rotary motion mechanism, and under the reverse elastic traction of the spring 1, the pipe fitting carrying trolley reciprocates forward and backward.

[0030] When the straight pipe fitting with elbow is impacted by the primary steel shot jet or the secondary steel shot jet, the straight pipe fitting with elbow rotates on the rectangular workbench through the circular plane rotating table of the rotating motion mechanism, and exhibits a pendulum motion on the circular plane rotating table under the reverse elastic traction of the second spring;

[0031] The above-mentioned linear reciprocating motion and oscillating motion can eliminate or reduce the vertical impact and excessive impact of the primary and secondary steel shot jets on the curved pipe section of the straight pipe fitting with elbow, thereby protecting the curved pipe section of the straight pipe fitting with elbow;

[0032] Step S43: After spraying the straight section, the shot peening gun is withdrawn, and then fed into the elbow end of the straight pipe fitting with elbow to perform shot peening and rust removal on the elbow section; similarly, the pipe fitting carrying trolley performs back and forth reciprocating motion, and the circular plane rotating table performs a swinging motion;

[0033] Step S5: Processing completed:

[0034] Step S51: closing and withdrawing the shot blasting gun;

[0035] Step S52: Open the two pipe fitting fasteners and remove the straight pipe fitting with elbow after internal rust removal.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] (1) The present invention adopts the design of a linear motion mechanism and a rotary motion mechanism, so that when the inner surface of a straight pipe fitting with an elbow is shot peened to remove rust, the elbow portion of the pipe fitting moves when subjected to an impact force, absorbing the impact energy, thereby eliminating or reducing the damage and destruction of the elbow portion of the pipe fitting caused by the impact force, avoiding breakdown caused by excessive jet flow, protecting the elbow section of the straight pipe fitting with an elbow, and improving the product yield rate.

[0038] (2) The present invention can reduce the movement amplitude and speed of the linear motion mechanism and the rotary motion mechanism by means of the buffer reset device 1 and the buffer reset device 2, and can also reset them in time, thereby ensuring that the device can eliminate and reduce the damage and destructive effect of the impact force on the bending part of the pipe fitting. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of a shot peening force analysis diagram of a straight pipe fitting with an elbow in the prior art, in which a steel shot jet vertically hits the outer wall of the pipe fitting;

[0040] Figure 2 It is a schematic diagram of the shot peening force analysis diagram of a straight pipe fitting with an elbow in the prior art, in which the secondary steel shot jet hits the outer wall of the pipe fitting from the lower end;

[0041] Figure 3 The shot peening force analysis diagram of a straight pipe fitting with an elbow in the prior art shows that the secondary jet hits the outer wall of the pipe fitting from the left;

[0042] Figure 4 A schematic structural diagram of a device for shot peening and removing rust and preventing breakdown of a steel straight pipe fitting with an elbow provided in an embodiment of the present invention;

[0043] Figure 5 for Figure 4 Schematic diagram of the top view of the mid-plane thrust bearing;

[0044] Figure 6 for Figure 5 A schematic diagram of the side cross-sectional structure of the annular base in the mid-plane thrust bearing;

[0045] Figure 7 for Figure 5 Schematic diagram of the side cross-sectional structure of the annular gland in the mid-plane thrust bearing.

[0046] Serial number in the picture:

[0047] 1. Linear motion mechanism; 11. Double-track track; 12. Pipe-carrying trolley; 121. Rectangular work surface; 13. Buffer reset device 1; 131. Spring 1; 132. Fixed block; 2. Rotary motion mechanism; 21. Circular plane rotating table; 22. Center axis; 23. Plane thrust bearing; 231. Annular base; 232. Annular pressure cover; 24. Pipe fastener; 25. Buffer reset device 2; 251 Spring 2; 252. Fixed end.

[0048] 3. Straight pipe fittings with elbows; 4. Nozzles; 5. Jet. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0050] like Figure 4 As shown, a device for shot peening and rust removal and anti-puncture of a steel straight pipe fitting with an elbow is provided in this embodiment, which is used for shot peening and rust removal of a straight pipe fitting with an elbow 3, and includes a linear motion mechanism 1, a rotary motion mechanism 2 and a buffer reset device.

[0051] The linear motion mechanism 1 includes a double-track track 11 and a pipe-carrying trolley 12. The pipe-carrying trolley 12 includes a rectangular work surface 121 and a workbench. The bottom of the workbench is rolled on the double-track track 11 by rollers, and the rectangular work surface 121 is installed on the top of the workbench to provide a carrier for reciprocating motion.

[0052] The rotating motion mechanism 2 is rotatably arranged above the pipe-carrying trolley 12, and is used to provide a carrier for the swinging motion; the rotating motion mechanism 2 includes a circular plane rotating table 21, a central axis 22, a plane thrust bearing 23, and a pipe fastener 24. The circular plane rotating table 21 is rotatably connected to the rectangular work table 121 through the central axis 22 and the plane thrust bearing 23. One end of the central axis 22 is fixed at the center of the rectangular work table 121, and the other end of the central axis 22 is connected to the center of the circular plane rotating table 21 through a bearing. The circular plane rotating table 21 rotates smoothly relative to the rectangular work table 121 through the central axis 22 and the plane thrust bearing 23. The plane thrust bearing design reduces friction during the rotating motion, improves the equipment operation efficiency, enhances the stability of the rotating table, and ensures the uniformity of shot peening and rust removal.

[0053] Further, if Figures 5 to 7 As shown, in this embodiment, the plane thrust bearing 23 includes an annular base 231 and an annular pressure cover 232. The annular base 231 is arranged at the center of the rectangular work surface 121, and the center of the annular base 231 coincides with the center projection of the rectangular work surface 121; the annular pressure cover 232 is arranged at the bottom of the circular plane rotating table 21, and the center of the annular pressure cover 232 coincides with the center projection of the circular plane rotating table 21. A plurality of balls are arranged between the annular base 231 and the annular pressure cover 232. The circular plane rotating table 21 can rotate freely relative to the rectangular work surface 121 through the connection of the plane thrust bearing 23.

[0054] This embodiment makes daily maintenance of the equipment more convenient by designing a simple, symmetrical and easily disassembled annular base 231 and annular pressure cover 232, which helps to reduce equipment maintenance costs.

[0055] The straight pipe fitting 3 with an elbow is fixed to the circular plane rotating table 21 by a pipe fastener 24. The pipe fastener 24 includes two symmetrically arranged pipe fixing parts. The two pipe fixing parts are symmetrically arranged on both sides of the center of the circular plane rotating table 21 and are located on the same diameter of the circular plane rotating table 21. They are used to fix the straight pipe fitting 3 with an elbow during the processing.

[0056] The buffer reset device includes a buffer reset device 13 and a buffer reset device 25. The buffer reset device 13 includes a spring 131 and a fixed block 132. The fixed block 132 is fixed on the ground on one side of the pipe-carrying trolley 12. The fixed block 132 is connected to the working platform of the pipe-carrying trolley 12 through the spring 131. When the pipe-carrying trolley 12 rolls and displaces on the double-track track 11, the spring 131 provides an elastic traction resistance in the opposite direction of the rolling direction of the pipe-carrying trolley 12, so that the pipe-carrying trolley 12 reciprocates on the double-track track 11.

[0057] The buffer reset device 25 includes a spring 251 and two fixed ends 252. The two fixed ends 252 are respectively arranged on the rectangular work table 121 and the circular plane rotating table 21, and the two fixed ends 252 are connected by the spring 251. When the circular plane rotating table 21 rotates on the rectangular work table 121, the spring 251 provides the circular plane rotating table 21 with an elastic traction resistance opposite to the rotation direction, so that the circular plane rotating table 21 exhibits a swinging motion on the rectangular work table 121.

[0058] The present invention also discloses an application method of a device for shot peening and removing rust and preventing breakdown of a steel straight pipe fitting with an elbow, and the steps are as follows:

[0059] Step S1: Assembling and placing the pipe carrying trolley 12:

[0060] Step S11: placing the bottom of the pipe-carrying trolley 12 on the double-track track 11 through rollers, so that the pipe-carrying trolley 12 can flexibly move forward and backward on the double-track track 11;

[0061] Step S12: The circular plane rotating table 21 of the rotating motion mechanism 2 is rotatably connected to the rectangular worktable 121 of the linear motion mechanism 1 through the central shaft 22 and the plane thrust bearing 23, and the circular plane rotating table 21 of the rotating motion mechanism 2 can rotate freely on the rectangular worktable surface 121;

[0062] Step S2: Install the buffer reset device:

[0063] Step S21: Install the buffer reset device 13: Install the fixed block 132 on the ground at one end of the pipe-carrying trolley 12, the installation position of the fixed block 132 is opposite to the initial rolling direction of the pipe-carrying trolley 12, and then connect the two ends of the spring 131 to the fixed block 132 and the workbench of the pipe-carrying trolley 12 respectively; when the pipe-carrying trolley 12 rolls and displaces on the double-track track 11, the spring 131 provides an elastic traction resistance opposite to the rolling direction of the pipe-carrying trolley 12, so that the pipe-carrying trolley 12 presents a linear reciprocating motion on the double-track track 11;

[0064] Step S22: Install the buffer reset device 25: The two fixed ends 252 are respectively installed on the rectangular work surface 121 and the circular plane rotating table 21, and the two fixed ends 252 are connected by the spring 251. When the circular plane rotating table 21 rotates on the rectangular work surface 121, the spring 251 provides an elastic traction resistance in the opposite direction of the rotation of the circular plane rotating table 21, so that the circular plane rotating table 21 presents a swinging motion on the rectangular work surface 121;

[0065] Step S3: Place the workpiece for processing:

[0066] Step S31: placing the straight pipe fitting with elbow to be processed 3 on the circular plane rotating table 21, wherein the elbow end and the straight pipe end of the straight pipe fitting with elbow 3 are both located on or outside the outer circle line of the circular rotating table 21;

[0067] Step S32: Then, two pipe fasteners are used to fix the straight pipe fittings 3 with elbows on the circular plane rotating platform 21, so that there is no relative movement between the straight pipe fittings 3 with elbows and the circular plane rotating platform 21;

[0068] Step S3: Processing:

[0069] Step S31: Sending the shot blasting gun head from the straight pipe end of the straight pipe fitting with elbow 3 into the pipe fitting until the elbow portion;

[0070] Step S32: Start the shot peening gun to start shot peening. During the shot peening operation, when the straight pipe fitting with elbow 3 is shot peened and rust removed, it is impacted by the secondary steel shot jet. The straight pipe fitting with elbow 3 drives the pipe fitting carrying trolley 12 to roll and displace through the rotary motion mechanism 2, and under the reverse elastic traction of the spring 131, the pipe fitting carrying trolley 12 reciprocates back and forth;

[0071] When the straight pipe fitting with elbow 3 is impacted by the primary steel shot jet or the secondary steel shot jet, the straight pipe fitting with elbow 3 rotates on the rectangular work table 121 through the circular plane rotating table 21 of the rotating motion mechanism 2, and exhibits a swinging motion on the circular plane rotating table 21 under the reverse elastic traction force of the spring 251;

[0072] The linear reciprocating motion and the oscillating motion are used to eliminate or reduce the vertical impact and excessive impact of the primary and secondary steel shot jets on the curved pipe section of the straight pipe fitting with elbow 3, thereby protecting the curved pipe section of the straight pipe fitting with elbow 3;

[0073] Step S33: After spraying the straight section, the shot peening gun is withdrawn and then fed into the elbow end of the straight pipe fitting with elbow 3 to perform shot peening and rust removal on the elbow section; similarly, the pipe fitting carrying trolley 12 performs back and forth reciprocating motion, and the circular plane rotating table 21 performs a swinging motion;

[0074] Step S4: Processing completed:

[0075] Step S41: closing and withdrawing the shot blasting gun;

[0076] Step S42: Open the two pipe fitting fasteners and remove the straight pipe fitting 3 with elbow after internal rust removal.

[0077] This device achieves effective protection for the full coverage shot peening and rust removal of the inner surface of straight pipe fittings with elbows through the coordination of linear reciprocating motion and swinging motion, significantly reduces the excessive impact of the primary and secondary steel shot jets on the elbow section, protects the structural integrity of the elbow section, and avoids breakdown problems caused by excessive jets; the planar thrust bearing design ensures the stability of the circular plane rotary table during movement, and cooperates with the elastic buffer device to further reduce vibration and deviation, thereby improving the accuracy and stability of the shot peening operation. The modular design enables the equipment to flexibly adapt to straight pipe fittings with elbows of different specifications and shapes, and cooperates with symmetrically arranged pipe fasteners to ensure that the pipe fittings are stable and do not roll during processing, while supporting rapid adjustment to meet diversified processing needs. While ensuring efficient and accurate rust removal, this device realizes a shot peening and rust removal solution for straight pipe fittings with elbows that takes into account both economy and applicability.

[0078] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0079] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0080] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for shot peening and removing rust from a steel straight pipe fitting with an elbow to prevent breakdown, used for shot peening and removing rust from a steel straight pipe fitting with an elbow (3), characterized in that: It comprises a linear motion mechanism (1), a rotary motion mechanism (2) and a buffer reset device; The linear motion mechanism (1) comprises a double-track track (11) and a pipe-carrying trolley (12); the pipe-carrying trolley (12) is rollingly arranged on the double-track track (11) and is used to provide a carrier for reciprocating motion; The rotary motion mechanism (2) is rotatably arranged on the top of the pipe-carrying trolley (12), and the straight pipe with elbow (3) is installed on the rotary motion mechanism (2) through a fixing member, and the rotary motion mechanism (2) is used to provide a carrier for rotary and pendulum motion; The buffer reset device comprises a buffer reset device 1 (13) and a buffer reset device 2 (25); the buffer reset device 1 (13) is arranged on one side of the pipe-carrying trolley (12) and is used to provide a reverse elastic traction resistance when the pipe-carrying trolley (12) rolls on a double-track track (11); the buffer reset device 2 (25) is connected to the linear motion mechanism (1) and the rotary motion mechanism (2) and is used to provide a reverse elastic traction resistance when the rotary motion mechanism (2) rotates on the linear motion mechanism (1).

2. The device for shot peening and rust removal and anti-puncture of a steel straight pipe fitting with an elbow according to claim 1, characterized in that: The pipe-carrying trolley (12) comprises a rectangular work surface (121) and a work frame; the bottom of the work frame is rolled on the double-track track (11) by rollers, and the rectangular work surface (121) is installed on the work frame; The rotary motion mechanism (2) comprises a circular plane rotary table (21), a central axis (22), a plane thrust bearing (23) and a pipe fastener (24); the circular plane rotary table (21) is rotatably connected to the rectangular work table (121) via the central axis (22) and the plane thrust bearing (23); one end of the central axis (22) is fixed at the center of the rectangular work table (121), and the other end of the central axis (22) is connected to the center of the circular plane rotary table (21); the circular plane rotary table (21) rotates smoothly relative to the rectangular work table (121) via the central axis (22) and the plane thrust bearing (23).

3. The device for shot peening and rust removal and anti-puncture of a steel straight pipe fitting with an elbow according to claim 2, characterized in that: The planar thrust bearing (23) comprises an annular base (231) and an annular pressure cover (232); the annular base (231) is arranged in the middle of the rectangular working table (121), and the center of the annular base (231) coincides with the center projection of the rectangular working table (121); the annular pressure cover (232) is arranged at the bottom of the circular planar rotating table (21), and the center of the annular pressure cover (232) coincides with the center projection of the circular planar rotating table (21); a plurality of balls are arranged between the annular base (231) and the annular pressure cover (232); the circular planar rotating table (21) is connected by the planar thrust bearing (23), and can rotate freely relative to the rectangular working table (121).

4. The device for shot peening and rust removal and anti-puncture of a steel straight pipe fitting with an elbow according to claim 2, characterized in that: The straight pipe fitting with an elbow (3) is fixed to the circular plane rotating table (21) via a pipe fitting fastener (24) for fixing the straight pipe fitting with an elbow (3) during the processing.

5. The device for shot peening and rust removal and anti-puncture of a steel straight pipe fitting with an elbow according to claim 4, characterized in that: The pipe fastener (24) comprises two symmetrically arranged pipe fixing parts, which are symmetrically arranged on both sides of the center of the circular plane rotating platform (21) and are located on the same diameter of the circular plane rotating platform (21).

6. The device for shot peening and rust removal and anti-puncture of a steel straight pipe fitting with an elbow according to claim 2, characterized in that: The buffer reset device (13) comprises a spring (131) and a fixed block (132); the fixed block (132) is fixed on the ground at one side of the pipe-carrying trolley (12); the fixed block (132) and the pipe-carrying trolley (12) are connected via the spring (131); when the pipe-carrying trolley (12) rolls and displaces on the double-track track (11), the spring (131) provides an elastic traction resistance in the opposite direction of the rolling direction of the pipe-carrying trolley (12), so that the pipe-carrying trolley (12) exhibits a linear reciprocating motion on the double-track track (11); The second buffer reset device (25) comprises a second spring (251) and two fixed ends (252), wherein the two fixed ends (252) are respectively arranged on the rectangular work surface (121) and the circular plane rotating table (21), and the two fixed ends (252) are connected via the second spring (251); when the circular plane rotating table (21) rotates on the rectangular work surface (121), the second spring (251) provides an elastic traction resistance in the opposite direction to the rotation direction of the circular plane rotating table (21), so that the circular plane rotating table (21) exhibits a swinging motion on the rectangular work surface (121).

7. An application method of the device for shot peening and rust removal and anti-puncture of a straight steel pipe fitting with an elbow according to any one of claims 1 to 6, characterized in that: The steps include: Step S1: Assembling and placing the pipe-carrying trolley (12): Step S11: placing the bottom of the pipe-carrying trolley (12) on the double-track track (11) via rollers, so that the pipe-carrying trolley (12) can flexibly move forward and backward on the double-track track (11); Step S12: The circular plane rotating table (21) of the rotating motion mechanism (2) is rotatably connected to the rectangular working table (121) of the linear motion mechanism (1) via the central axis (22) and the plane thrust bearing (23), so that the circular plane rotating table (21) of the rotating motion mechanism (2) can rotate freely on the rectangular working table surface (121); Step S2: Install the buffer reset device: Step S21: Installing the buffer reset device 1 (13): installing a fixed block (132) on the ground at one end of the pipe-carrying trolley (12), the installation position of the fixed block (132) being opposite to the initial rolling direction of the pipe-carrying trolley (12), and then connecting the two ends of the spring 1 (131) to the fixed block (132) and the working platform of the pipe-carrying trolley (12) respectively; when the pipe-carrying trolley (12) rolls and moves on the double-track track (11), the spring 1 (131) provides an elastic traction resistance opposite to the rolling direction of the pipe-carrying trolley (12), so that the pipe-carrying trolley (12) exhibits a linear reciprocating motion on the double-track track (11); Step S22: installing the second buffer reset device (25): the two fixed ends (252) are respectively installed on the rectangular work surface (121) and the circular plane rotating table (21), and the two fixed ends (252) are connected by a second spring (251). When the circular plane rotating table (21) rotates on the rectangular work surface (121), the second spring (251) provides an elastic traction resistance in the opposite direction of the rotation of the circular plane rotating table (21), so that the circular plane rotating table (21) exhibits a swinging motion on the rectangular work surface (121); Step S3: Place the workpiece for processing: Step S31: placing the straight pipe fitting with elbow to be processed (3) on a circular plane rotating table (21), wherein the elbow end and the straight pipe end of the straight pipe fitting with elbow (3) are both located on or outside the outer circle of the circular rotating table (21); Step S32: Then, two pipe fasteners are used to fix the straight pipe fitting with elbow (3) on the circular plane rotating platform (21) respectively, so that there is no relative movement between the straight pipe fitting with elbow (3) and the circular plane rotating platform (21); Step S4: Processing: Step S41: Sending the shot blasting gun head from the straight pipe end of the straight pipe fitting with elbow (3) into the pipe fitting until it reaches the elbow position; Step S42: The shot peening gun is started to start shot peening. During the shot peening operation, when the straight pipe fitting with elbow (3) is shot peened and rust removed, it is impacted by the secondary steel shot jet. The straight pipe fitting with elbow (3) drives the pipe fitting carrying trolley (12) to roll and move through the rotary motion mechanism (2), and under the reverse elastic traction force of the spring 1 (131), the pipe fitting carrying trolley (12) exhibits a forward and backward reciprocating motion. When the straight pipe fitting with elbow (3) is impacted by the primary steel shot jet or the secondary steel shot jet, the straight pipe fitting with elbow (3) is rotated on the rectangular work table (121) through the circular plane rotating table (21) of the rotating motion mechanism (2), and under the reverse elastic traction force of the second spring (251), it exhibits a swinging motion on the circular plane rotating table (21); The linear reciprocating motion and the oscillating motion are used to eliminate or reduce the vertical impact and excessive impact of the primary steel shot jet and the secondary steel shot jet on the curved pipe section of the straight pipe fitting with elbow (3), thereby protecting the curved pipe section of the straight pipe fitting with elbow (3); Step S43: After the straight section is sprayed, the shot peening gun is withdrawn and then fed into the elbow end of the straight pipe fitting with elbow (3) to perform shot peening and rust removal on the elbow section; similarly, the pipe fitting carrying trolley (12) performs a forward and backward reciprocating motion, and the circular plane rotating table (21) performs a swinging motion; Step S5: Processing completed: Step S51: closing and withdrawing the shot blasting gun; Step S52: Open the two pipe fitting fasteners and remove the straight pipe fitting with elbow (3) after internal rust removal.

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