Device for preventing breakage of elbow steel straight pipe fitting by shot blasting inner rust removal and application method thereof

Abstract

The application provides a device and application method for shot blasting inner rust removal and anti-penetration of a steel straight pipe fitting with an elbow, and the device for shot blasting inner rust removal and anti-penetration of the steel straight pipe fitting with the elbow is coordinated by linear reciprocating motion and rotary motion, so that when the elbow part of the pipe fitting is impacted by shot blasting, the movement mechanism moves to absorb excessive impact energy, thereby eliminating or reducing the damage and destruction of the impact force on the elbow part of the pipe fitting; the linear movement mechanism moves linearly under the action of the impact force, and the rotary movement mechanism rotates under the action of the impact force; and the buffer reset device enables the pipe fitting and the movement mechanism to return to the initial position after being impacted and moving.

Description

Technical Field

[0001] This invention relates to the technical field of internal rust removal for straight steel pipe fittings with elbows, and in particular to a device and application method for shot blasting internal rust removal and anti-penetration of straight steel pipe fittings with elbows. Background Technology

[0002] Piping systems on FPSO platforms used in offshore oil and gas exploration and production, as well as in petrochemical plants, rely heavily on shaped steel pipe fittings. There are many types of shaped steel pipe fittings, among which straight steel pipe fittings with an elbow at one end are the most common. Because the transported media and operating conditions are corrosive to steel pipe fittings, these fittings require internal anti-corrosion coating before installation and use. Rust removal of the inner wall of the fittings before coating is a necessary process. In factory-based coating operations, shot blasting or sandblasting is the most widely used rust removal method.

[0003] Because straight steel pipe fittings with bends are irregularly shaped, in actual production, they are typically placed on a workbench and processed one by one by manual operation of the shot peening device. During shot peening at the bend, the angle between the steel shot jet 5 and the pipe wall changes. Figures 1 to 3 As shown, the vertical impact and excessive impact of the primary and secondary steel shot jets on the bend section cause the outer wall thickness of the bend section to decrease. In severe cases, the pipe wall may be punctured, resulting in a decrease in the performance of the pipe fitting or rendering it unusable. Summary of the Invention

[0004] The purpose of this invention is to provide a shot blasting rust removal device and its application method that can eliminate or reduce the vertical impact and excessive impact of the jet on the bend section of the pipe in the prior art and protect the bend section of the steel straight pipe fitting with elbow.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A device for shot blasting and rust removal and anti-penetration of straight steel pipe fittings with elbows, used for shot blasting and rust removal of straight steel pipe fittings with elbows, includes a linear motion mechanism, a rotary motion mechanism and a buffer reset device.

[0007] The linear motion mechanism includes a double-track rail and a pipe-carrying trolley, the pipe-carrying trolley being rolled on the double-track rail to provide a carrier for reciprocating motion;

[0008] The rotary motion mechanism is rotatably mounted above the pipe fitting carrying trolley, and the straight pipe fitting with elbow is mounted on the rotary motion mechanism by a fixing member. The rotary motion mechanism is used to provide a carrier for the swing motion.

[0009] The buffer reset device includes a buffer reset device one and a buffer reset device two; the buffer reset device one is disposed on one side of the pipe fitting carrying trolley and is used to provide reverse elastic traction resistance when the pipe fitting carrying trolley rolls on the double track; the buffer reset device two 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 fitting carrying trolley includes a rectangular worktable and a worktable frame; the bottom of the worktable frame is rolled on the double-rail track by rollers, and a rectangular workbench is installed on the top of the worktable frame;

[0011] The rotary motion mechanism includes a circular planar rotary table, a central shaft, a planar thrust bearing, and a pipe fastener. The circular planar rotary table is rotatably connected to the rectangular worktable via the central shaft and the planar thrust bearing. One end of the central shaft is fixed to the center of the rectangular worktable, and the other end of the central shaft is connected to the center of the circular planar rotary table via a bearing. The circular planar rotary table rotates smoothly relative to the rectangular worktable via the central shaft and the planar thrust bearing.

[0012] Preferably, the planar thrust bearing includes an annular base and an annular cap. The annular base is located at the center of the rectangular worktable, and the center of the annular base coincides with the center projection of the rectangular worktable. The annular cap is located at the bottom of the circular planar rotary table, and the center of the annular cap coincides with the center projection of the circular planar rotary table. A plurality of ball bearings are provided between the annular base and the annular cap. Through the connection of the planar thrust bearing, the circular planar rotary table can rotate freely relative to the rectangular worktable.

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

[0014] Preferably, the pipe fastener includes two symmetrically arranged pipe fasteners, which are symmetrically arranged on both sides of the center of the circular plane rotary table and located on the same diameter of the circular plane rotary table.

[0015] Preferably, the buffer reset device includes a spring and a fixing block. The fixing block is fixed to the ground on one side of the pipe fitting carrying trolley, and the fixing block is connected to the pipe fitting carrying trolley by the spring. When the pipe fitting carrying trolley rolls on the double track, the spring provides elastic traction resistance opposite to the rolling direction of the pipe fitting carrying trolley, so that the pipe fitting carrying trolley exhibits linear reciprocating motion on the double track.

[0016] The buffer reset device includes a spring and two fixed ends. The two fixed ends are respectively disposed on the rectangular worktable and the circular plane rotating platform, and are connected by the spring. When the circular plane rotating platform rotates on the rectangular worktable, the spring provides an elastic traction resistance opposite to the rotation direction of the circular plane rotating platform, causing the circular plane rotating platform to exhibit a gyratory motion on the rectangular worktable.

[0017] This invention also provides a method for applying a device for shot blasting internal rust removal and anti-penetration of straight steel pipe fittings with elbows, comprising the following steps:

[0018] Step S1: Assemble and place the pipe fitting support trolley:

[0019] Step S11: Place the bottom of the pipe fitting carrying trolley on the double rail using rollers, so that the pipe fitting carrying trolley can move forward and backward flexibly on the double rail.

[0020] Step S12: Connect the circular planar rotary table of the rotary motion mechanism to the rectangular worktable of the linear motion mechanism through a central shaft and a planar thrust bearing. The circular planar rotary 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 buffer reset device one: Install the fixing block on the ground at one end of the pipe fitting carrying trolley. The installation position of the fixing block is opposite to the initial rolling direction of the pipe fitting carrying trolley. Then connect the two ends of spring one to the fixing block and the workbench of the pipe fitting carrying trolley respectively. When the pipe fitting carrying trolley rolls on the double track, spring one provides elastic traction resistance opposite to the rolling direction of the pipe fitting carrying trolley, so that the pipe fitting carrying trolley presents a linear reciprocating motion on the double track.

[0023] Step S22: Install buffer reset device two: The two fixed ends are respectively installed on the rectangular worktable and the circular plane rotary table. The two fixed ends are connected by spring two. When the circular plane rotary table rotates on the rectangular worktable, spring two provides elastic traction resistance opposite to the rotation direction of the circular plane rotary table, so that the circular plane rotary table presents a gyratory motion on the rectangular worktable.

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

[0025] Step S31: Place the straight pipe fitting with elbow to be processed onto the circular rotating platform, wherein the elbow end and the straight pipe end of the straight pipe fitting are both located on or outside the outer circle of the circular rotating platform.

[0026] Step S32: Then, use two pipe fasteners to fix the straight pipe fitting with elbow on the circular plane rotating table so that there is no relative movement between the straight pipe fitting with elbow and the circular plane rotating table.

[0027] Step S4: Processing:

[0028] Step S41: Insert the shot peening gun head into the straight pipe fitting from the straight pipe end with the bend until the bend is reached.

[0029] Step S42: Start the shot blasting gun to begin shot blasting. During shot blasting, when the straight pipe fitting with elbow is shot blasted inside to remove rust, it is impacted by the secondary steel shot jet. The straight pipe fitting with elbow is driven by the rotating motion mechanism to roll the pipe fitting trolley. Under the reverse elastic traction force of spring one, the pipe fitting trolley moves back and forth.

[0030] When the straight pipe fitting with elbow is impacted by a primary or secondary steel shot jet, the straight pipe fitting with elbow rotates on a rectangular worktable via a circular plane rotating table of the rotary motion mechanism, and under the reverse elastic traction force of spring two, it exhibits a gyratory motion on the circular plane rotating table.

[0031] The above-mentioned linear reciprocating motion and gyratory 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 bent section of the straight pipe fitting with elbow, thus protecting the bent section of the straight pipe fitting with elbow.

[0032] Step S43: After the straight section is shot blasted, the shot blasting gun is withdrawn and then fed in from the elbow end of the straight pipe fitting with elbow to shot blast the elbow section to remove rust; similarly, the pipe fitting carrying trolley moves back and forth, and the circular plane rotary table moves in a gyratory motion.

[0033] Step S5: Processing completed:

[0034] Step S51: Close and withdraw the shot peening gun;

[0035] Step S52: Open the two pipe fitting fasteners and remove the straight pipe fitting with elbow that has been cleaned of internal rust.

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

[0037] (1) The present invention uses a linear motion mechanism and a rotary motion mechanism to make the pipe bend section of the straight pipe fitting with elbow move when the pipe bend is subjected to impact force during shot blasting to remove rust. This absorbs the impact energy, thereby eliminating or reducing the damage and destruction of the pipe bend section by the impact force, avoiding puncture caused by excessive jetting, protecting the bend section of the straight pipe fitting with elbow, and improving the product yield.

[0038] (2) By means of buffer reset device one and buffer reset device two, the present invention can not only slow down the movement amplitude and speed of the linear motion mechanism and the rotary motion mechanism, but also reset them in time, so as to ensure the continuity of the device in eliminating and reducing the impact force on the pipe bending part. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the shot peening force analysis of a straight pipe fitting with an elbow in the prior art, showing a single shot jet vertically impacting the outer wall of the fitting.

[0040] Figure 2 This is a schematic diagram of the secondary steel shot jet striking the outer wall of a straight pipe fitting with an elbow in the prior art.

[0041] Figure 3 In the shot peening force analysis diagram of a straight pipe fitting with an elbow in the existing technology, the secondary jet strikes the outer wall of the pipe fitting from the left.

[0042] Figure 4 A schematic diagram of a device for shot blasting internal rust removal and anti-penetration of a straight steel pipe fitting with an elbow, provided for an embodiment of the present invention;

[0043] Figure 5 for Figure 4 A top view of the mid-plane thrust bearing.

[0044] Figure 6 for Figure 5 A side sectional view of the annular base in a mid-plane thrust bearing;

[0045] Figure 7 for Figure 5 A side sectional view of the annular gland in a mid-plane thrust bearing.

[0046] Number in the diagram:

[0047] 1. Linear motion mechanism; 11. Double track; 12. Pipe fitting carrying trolley; 121. Rectangular worktable; 13. Buffer reset device one; 131. Spring one; 132. Fixing block; 2. Rotary motion mechanism; 21. Circular plane rotary table; 22. Central shaft; 23. Planar thrust bearing; 231. Annular base; 232. Annular pressure cap; 24. Pipe fitting fastener; 25. Buffer reset device two; 251. Spring two; 252. Fixing end.

[0048] 3. Straight pipe fittings with bends; 4. Nozzle; 5. Jet. Detailed Implementation

[0049] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0050] like Figure 4 As shown in this embodiment, a shot blasting device for internal rust removal and anti-penetration of straight steel pipe fittings with elbows is provided. It is used to perform shot blasting rust removal on straight steel pipe fittings with elbows 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 rail 11 and a pipe fitting carrying trolley 12. The pipe fitting carrying trolley 12 includes a rectangular worktable 121 and a workbench frame. The bottom of the workbench frame is rolled on the double-track rail 11 by rollers, and the rectangular worktable 121 is installed on the top of the workbench frame to provide a carrier for reciprocating motion.

[0052] The rotary motion mechanism 2 is rotatably mounted above the pipe fitting carrying trolley 12, providing a carrier for the oscillating motion. The rotary motion mechanism 2 includes a circular planar rotary table 21, a central shaft 22, a planar thrust bearing 23, and a pipe fitting fastener 24. The circular planar rotary table 21 is rotatably connected to the rectangular worktable 121 via the central shaft 22 and the planar thrust bearing 23. One end of the central shaft 22 is fixed to the center of the rectangular worktable 121, and the other end is connected to the center of the circular planar rotary table 21 via a bearing. The circular planar rotary table 21 rotates smoothly relative to the rectangular worktable 121 via the central shaft 22 and the planar thrust bearing 23. The planar thrust bearing design reduces friction during rotation, improves equipment operating efficiency, enhances the stability of the rotary table, and ensures the uniformity of shot blasting.

[0053] Furthermore, such as Figures 5 to 7 As shown, in this embodiment, the planar thrust bearing 23 includes an annular base 231 and an annular cap 232. The annular base 231 is located at the center of the rectangular worktable 121, and the center of the annular base 231 coincides with the center projection of the rectangular worktable 121. The annular cap 232 is located at the bottom of the circular planar rotary table 21, and the center of the annular cap 232 coincides with the center projection of the circular planar rotary table 21. A plurality of balls are provided between the annular base 231 and the annular cap 232. Through the connection of the planar thrust bearing 23, the circular planar rotary table 21 can rotate freely relative to the rectangular worktable 121.

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

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

[0056] The buffer reset device includes buffer reset device one 13 and buffer reset device two 25. Buffer reset device one 13 includes spring one 131 and fixing block 132. Fixing block 132 is fixed on the ground on one side of the pipe fitting carrying trolley 12. Fixing block 132 is connected to the workbench of pipe fitting carrying trolley 12 by spring one 131. When pipe fitting carrying trolley 12 rolls on the double track 11, spring one 131 provides elastic traction resistance opposite to the rolling direction of pipe fitting carrying trolley 12, so that pipe fitting carrying trolley 12 reciprocates on the double track 11.

[0057] The buffer reset device 25 includes a spring 251 and two fixed ends 252. The two fixed ends 252 are respectively set on the rectangular worktable 121 and the circular plane rotary table 21, and the two fixed ends 252 are connected by the spring 251. When the circular plane rotary table 21 rotates on the rectangular worktable 121, the spring 251 provides elastic traction resistance opposite to the direction of rotation of the circular plane rotary table 21, so that the circular plane rotary table 21 presents a gyratory motion on the rectangular worktable 121.

[0058] The present invention also discloses the application method of the device for shot blasting internal rust removal and anti-penetration of straight steel pipe fittings with elbows, the steps of which are as follows:

[0059] Step S1: Assemble and place the pipe fitting support trolley 12:

[0060] Step S11: Place the bottom of the pipe fitting carrying trolley 12 on the double rail 11 using rollers, so that the pipe fitting carrying trolley 12 can move forward and backward flexibly on the double rail 11;

[0061] Step S12: The circular planar rotary table 21 of the rotary motion mechanism 2 and the rectangular worktable 121 of the linear motion mechanism 1 are rotatably connected through the central shaft 22 and the planar thrust bearing 23. The circular planar rotary table 21 of the rotary motion mechanism 2 can rotate freely on the rectangular worktable 121.

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

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

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

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

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

[0067] Step S32: Then, use two pipe fasteners to fix the straight pipe fitting with elbow on the circular plane rotary table 21 so that there is no relative movement between the straight pipe fitting with elbow and the circular plane rotary table 21.

[0068] Step S3: Processing:

[0069] Step S31: Insert the shot peening gun head into the pipe fitting 3 from the straight pipe end with the bend until the bend is reached.

[0070] Step S32: Start the shot blasting gun to begin shot blasting. During the shot blasting operation, when the straight pipe fitting with elbow 3 is shot blasted inside to remove rust, 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. Under the reverse elastic traction force of the spring 131, the pipe fitting carrying trolley 12 exhibits back-and-forth reciprocating motion.

[0071] When the straight pipe fitting 3 with elbow is impacted by a primary or secondary steel shot jet, the straight pipe fitting 3 with elbow rotates on the rectangular worktable 121 via the circular plane rotary table 21 of the rotary motion mechanism 2, and under the reverse elastic traction force of the spring 251, it exhibits a gyratory motion on the circular plane rotary table 21.

[0072] The above-mentioned linear reciprocating motion and gyratory 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 bent section of the straight pipe fitting 3 with elbow, thereby protecting the bent section of the straight pipe fitting 3 with elbow.

[0073] Step S33: After the straight section is shot blasted, the shot blasting gun is withdrawn and then fed in from the elbow end of the straight pipe fitting 3 with elbow to shot blast the elbow section to remove rust; similarly, the pipe fitting carrying trolley 12 moves back and forth, and the circular plane rotary table 21 moves in a gyratory motion.

[0074] Step S4: Processing completed:

[0075] Step S41: Close and withdraw the shot blasting gun;

[0076] Step S42: Open the two pipe fitting fasteners and remove the straight pipe fitting 3 with elbow that has been cleaned of internal rust.

[0077] This device achieves effective protection during shot blasting of straight pipe fittings with bends by coordinating linear reciprocating motion and rotary motion. It significantly reduces the excessive impact of primary and secondary steel shot jets on the bend section, protecting its structural integrity and preventing punctures caused by excessive jetting. The planar thrust bearing design ensures the stability of the circular rotary table during movement, and the elastic buffer further reduces vibration and offset, improving the accuracy and stability of the shot blasting operation. The modular design allows the equipment to flexibly adapt to straight pipe fittings with bends of different specifications and shapes. Symmetrically arranged pipe fasteners ensure the pipe fittings remain stable and do not roll during processing, while also supporting rapid adjustments to meet diverse processing needs. This device provides a shot blasting solution for straight pipe fittings with bends that balances efficiency and precision while offering economic benefits and applicability.

[0078] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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. Therefore, they should not be construed as limitations on this invention.

[0079] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0080] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for preventing breakage of shot peening for rust removal inside a steel straight pipe fitting with a bend, for performing shot peening for rust removal on a straight pipe fitting (3) with a bend, characterized in that, It includes a linear motion mechanism (1), a rotary motion mechanism (2), and a buffer reset device; The linear motion mechanism (1) includes a double track (11) and a pipe fitting carrying trolley (12). The pipe fitting carrying trolley (12) is rolled on the double track (11) to provide a carrier for reciprocating motion. The rotary motion mechanism (2) is rotatably mounted on the top of the pipe fitting carrying trolley (12), and the straight pipe fitting (3) with elbow is mounted on the rotary motion mechanism (2) by a fixing member. The rotary motion mechanism (2) is used to provide a carrier for the swing motion. The buffer reset device includes a buffer reset device one (13) and a buffer reset device two (25); the buffer reset device one (13) is disposed on one side of the pipe fitting carrying trolley (12) and is used to provide reverse elastic traction resistance when the pipe fitting carrying trolley (12) rolls on the double track (11); the buffer reset device two (25) is connected to the linear motion mechanism (1) and the rotary motion mechanism (2) and is used to provide reverse elastic traction resistance when the rotary motion mechanism (2) rotates on the linear motion mechanism (1); The pipe fitting carrying trolley (12) includes a rectangular worktable (121) and a workbench frame; the bottom of the workbench frame is rolled on the double rail (11) by rollers, and the rectangular worktable (121) is installed on the workbench frame. The rotary motion mechanism (2) includes a circular planar rotary table (21), a central shaft (22), a planar thrust bearing (23), and a pipe fastener (24). The circular planar rotary table (21) is rotatably connected to the rectangular worktable (121) through the central shaft (22) and the planar thrust bearing (23). One end of the central shaft (22) is fixed at the center of the rectangular worktable (121), and the other end of the central shaft (22) is connected to the center of the circular planar rotary table (21). The circular planar rotary table (21) rotates smoothly relative to the rectangular worktable (121) through the central shaft (22) and the planar thrust bearing (23). The planar thrust bearing (23) includes an annular base (231) and an annular cover (232). The annular base (231) is located in the middle of the rectangular worktable (121), and the center of the annular base (231) coincides with the center projection of the rectangular worktable (121). The annular cover (232) is located at the bottom of the circular planar rotary table (21), and the center of the annular cover (232) coincides with the center projection of the circular planar rotary table (21). A plurality of balls are provided between the annular base (231) and the annular cover (232). The circular planar rotary table (21) can rotate freely relative to the rectangular worktable (121) through the connection of the planar thrust bearing (23).

2. A device for shot blasting inner rust removal and anti-piercing of a straight pipe fitting with elbow made of steel according to claim 1, characterized in that, The straight pipe fitting with elbow (3) is fixed to the circular plane rotating table (21) by a pipe fitting fastener (24) for fixing the straight pipe fitting with elbow (3) during processing.

3. The device for shot blasting internal rust removal and anti-penetration of straight steel pipe fittings with elbows according to claim 2, characterized in that, The pipe fastener (24) includes two symmetrically arranged pipe fasteners. The two pipe fasteners 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).

4. The device for shot blasting internal rust removal and anti-penetration of straight steel pipe fittings with elbows according to claim 3, characterized in that, The buffer reset device (13) includes a spring (131) and a fixing block (132). The fixing block (132) is fixed on the ground on one side of the pipe fitting carrying trolley (12). The fixing block (132) and the pipe fitting carrying trolley (12) are connected by the spring (131). When the pipe fitting carrying trolley (12) rolls on the double track (11), the spring (131) provides an elastic traction resistance opposite to the rolling direction of the pipe fitting carrying trolley (12), so that the pipe fitting carrying trolley (12) moves in a straight line on the double track (11). The buffer reset device 2 (25) includes a spring 2 (251) and two fixed ends (252). The two fixed ends (252) are respectively disposed on the rectangular worktable (121) and the circular plane rotary table (21). The two fixed ends (252) are connected by the spring 2 (251). When the circular plane rotary table (21) rotates on the rectangular worktable (121), the spring 2 (251) provides an elastic traction resistance opposite to the rotation direction of the circular plane rotary table (21), so that the circular plane rotary table (21) presents a gyratory motion on the rectangular worktable (121).

5. A method for applying the shot blasting internal rust removal and anti-penetration device for straight steel pipe fittings with elbows as described in claim 4, characterized in that, Includes the following steps: Step S1: Assemble and place the pipe fitting support trolley (12): Step S11: Place the bottom of the pipe fitting carrying trolley (12) on the double rail (11) using rollers, so that the pipe fitting carrying trolley (12) can move forward and backward flexibly on the double rail (11); Step S12: Connect the circular planar rotary table (21) of the rotary motion mechanism (2) to the rectangular worktable (121) of the linear motion mechanism (1) through the central shaft (22) and the planar thrust bearing (23). The circular planar rotary table (21) of the rotary motion mechanism (2) can rotate freely on the rectangular worktable (121). Step S2: Install the buffer reset device: Step S21: Install buffer reset device 1 (13): Install the fixing block (132) on the ground at one end of the pipe fitting carrying trolley (12). The installation position of the fixing block (132) is opposite to the initial rolling direction of the pipe fitting carrying trolley (12). Then connect the two ends of the spring 1 (131) to the fixing block (132) and the workbench of the pipe fitting carrying trolley (12) respectively. When the pipe fitting carrying trolley (12) rolls on the double track (11), the spring 1 (131) provides elastic traction resistance opposite to the rolling direction of the pipe fitting carrying trolley (12), so that the pipe fitting carrying trolley (12) presents a linear reciprocating motion on the double track (11). Step S22: Install buffer reset device two (25): Two fixed ends (252) are respectively installed on the rectangular worktable (121) and the circular plane rotary table (21). The two fixed ends (252) are connected by spring two (251). When the circular plane rotary table (21) rotates on the rectangular worktable (121), the spring two (251) provides elastic traction resistance opposite to the rotation direction of the circular plane rotary table (21), so that the circular plane rotary table (21) presents a gyratory motion on the rectangular worktable (121). Step S3: Place the workpiece for processing: Step S31: Place the straight pipe fitting (3) with elbow to be processed onto the circular plane rotating table (21), wherein the elbow end and the straight pipe end of the straight pipe fitting (3) are located on or outside the outer circle of the circular rotating table (21). Step S32: Then, use two pipe fasteners to fix the straight pipe fitting (3) with elbow on the circular plane rotary table (21) so that there is no relative movement between the straight pipe fitting (3) with elbow and the circular plane rotary table (21); Step S4: Processing: Step S41: Insert the shot blasting gun head into the pipe fitting (3) from the straight pipe end with the bend until the bend is reached; Step S42: Start the shot blasting gun to start shot blasting. When the straight pipe fitting with elbow (3) is shot blasted inside to remove rust, 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 displacement through the rotary motion mechanism (2), and under the reverse elastic traction force of spring 1 (131), the pipe fitting carrying trolley (12) exhibits back and forth reciprocating motion. When the straight pipe fitting with elbow (3) is impacted by a primary or secondary steel shot jet, the straight pipe fitting with elbow (3) rotates on the rectangular worktable (121) via the circular plane rotary table (21) of the rotary motion mechanism (2), and under the reverse elastic traction force of the second spring (251), it exhibits a gyratory motion on the circular plane rotary table (21); The above-mentioned linear reciprocating motion and gyratory 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 bent section of the straight pipe fitting (3) with elbow, and protect the bent section of the straight pipe fitting (3) with elbow. Step S43: After the straight section is shot blasted, the shot blasting gun is withdrawn and then sent in from the elbow end of the straight pipe fitting (3) with elbow to perform shot blasting and rust removal on the elbow section; similarly, the pipe fitting carrying trolley (12) moves back and forth, and the circular plane rotary table (21) swings. Step S5: Processing completed: Step S51: Close and withdraw the shot peening gun; Step S52: Open the two pipe fitting fasteners and remove the straight pipe fitting with elbow (3) that has been cleaned of internal rust.

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