Steel pipe inner surface treatment system

Abstract

The present invention discloses a steel pipe inner surface treatment system, comprising two production lines and two circulating conveying mechanisms. The production lines include a sandblasting storage mechanism, a steel pipe conveying mechanism, a sandblasting assembly, and two collecting mechanisms of a rotating support mechanism. The sandblasting storage mechanism includes a sand material conveying pipe. The sandblasting assembly includes a sandblasting pipe and a sandblasting nozzle. The sandblasting pipe can be detachably and sealedly connected to the output end of the sand material conveying pipe through a clamping docking mechanism. The present invention provides a plurality of sandblasting assemblies that can be separated from the sand material conveying pipe. After the sandblasting pipe passes through the steel pipe and completes the sandblasting treatment, the sandblasting pipe is separated from the sand material conveying pipe by the clamping docking structure. The steel pipe conveying mechanism removes the steel pipe and the sandblasting assembly inside the steel pipe together, and conveys the steel pipe with the sandblasting assembly inserted at the loading standby station to the sandblasting station. The sandblasting pipe is then connected to the sand material conveying pipe by the clamping docking structure, thereby saving the time of the sandblasting assembly moving in a single direction, shortening the processing interval time, and improving the processing efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of steel pipe inner surface treatment, in particular to a steel pipe inner surface treatment system. Background Art

[0002] Plastic-lined steel pipes are based on galvanized seamless steel pipes or welded steel pipes. After sandblasting the inner wall, a food-grade polyethylene pipe of the same diameter as the galvanized pipe is inserted. Finally, the pipe is pressurized and heated for a certain period of time before being formed. In the prior art, when sandblasting the inner wall of a steel pipe, one end of the sandblasting pipe is connected to a high-pressure sand tank and the other end to a sandblasting head. The sandblasting pipe is then inserted into the steel pipe, and sandblasting is performed during the process of inserting the pipe into the pipe and retracting from the pipe. For an example of sandblasting the inner surface of a steel pipe in the prior art, see the automatic sandblasting and rust removal system for the inner wall of a pipe disclosed in patent application number 201210513814.6.

[0003] Since sandblasting only requires a single pass, while existing sandblasting hoses must make two round trips to operate properly, improving the existing system so that the sandblasting hose can only move in a single pass will inevitably save some time and improve the efficiency of steel pipe processing.

[0004] It should be noted that the above content falls within the technical knowledge of the inventor and does not necessarily constitute prior art. Summary of the Invention

[0005] Based on this, it is necessary to provide a steel pipe inner surface treatment system to address the above technical problems.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a steel pipe inner surface treatment system, including a production line, the production line including a sandblasting storage mechanism, a steel pipe conveying mechanism and a sandblasting assembly, the sandblasting storage mechanism including a movable sand material conveying pipe for conveying high-pressure sand material to the sandblasting assembly, the steel pipe conveying mechanism being used to convey the steel pipe in sequence through a loading standby station, a sandblasting station and a unloading standby station, the sandblasting assembly including a sandblasting pipe and a sandblasting nozzle, the output end of the sandblasting pipe being connected to the sandblasting nozzle, the input end of the sandblasting pipe being detachably and sealedly connected to the output end of the sand material conveying pipe at the sandblasting station through a clamping docking mechanism; the production lines are set as two, and the conveying directions of the steel pipe conveying mechanisms of the two production lines are opposite, and the sandblasting assembly on the steel pipe conveying mechanism and located at the unloading standby station is conveyed to the loading standby station on another steel pipe conveyor through a circulating conveying mechanism.

[0007] Preferably, the sandblasting storage mechanism further includes a high-pressure sand tank, a track, and a track trolley. The track trolley is rollingly mounted on the track, the high-pressure sand tank is mounted on the track trolley, and the high-pressure sand tank is connected to the input end of the sand material conveying pipe.

[0008] Preferably, the production line also includes two collecting mechanisms, which include a first fixed bracket, a dust collecting box and a first power cylinder. The dust collecting box is located on both sides of the steel pipe at the sandblasting station and surrounds both ends of the steel pipe. The sand material conveying pipe can extend into the dust collecting box. The dust collecting box is connected to the dust removal equipment through a dust pipe. The dust collecting box includes a lower fixed part and an upper movable part. A waste outlet is provided at the bottom of the lower fixed part. A semicircular opening for the movement of the steel pipe is provided at one end of the lower fixed part and the upper movable part facing the steel pipe conveying mechanism. The lower fixed part is fixedly connected to the first fixed bracket. The first power cylinder is fixedly installed on the top of the first fixed bracket and is located above the dust collecting box. The output end of the first power cylinder is connected to the upper movable part.

[0009] Preferably, the steel pipe conveying mechanism includes a double-chain conveyor, a second fixed bracket and a second power cylinder. The second power cylinder is installed on the second fixed bracket. The output end of the second power cylinder is connected to the double-chain conveyor to drive the double-chain conveyor to rise and fall linearly. Several accessories are fixed on the chain of the double-chain conveyor. The accessories have an inclined surface for contacting and cooperating with the steel pipe. The steel pipe can be clamped between the inclined surfaces of two adjacent accessories.

[0010] Preferably, the production line also includes a rotating support mechanism located at the lower inner side of the double-chain conveyor, which supports and drives the steel pipe at the sandblasting station to rotate; the rotating support mechanism includes a third fixed bracket, a second drive motor, a first rotating shaft and a supporting roller, the third fixed bracket is equipped with a second drive motor and multiple first rotating shafts, the first rotating shaft is equipped with a driven pulley and at least two supporting rollers, the output end of the second drive motor is equipped with a driving pulley, and multiple guide pulleys are also rotatably installed on the third fixed bracket, and the driving pulley is connected to the guide pulley and the driven pulley through a transmission belt.

[0011] Preferably, the sandblasting components are arranged into four groups, and the number of sandblasting components in each group is 1 to 8; the sandblasting components also include at least two rotating supports, the rotating supports include a fourth fixed bracket and at least two universal ball bearings, the fourth fixed bracket is fixedly mounted on the sandblasting tube, and the universal ball bearings are fixedly mounted on the fourth fixed bracket and are circumferentially distributed on the periphery of the sandblasting tube.

[0012] Preferably, the input end of the sandblasting tube is provided with a front flange, and the output end of the sand conveying tube is provided with a tail flange; the front flange is provided with a groove with a trapezoidal cross section, and the tail flange is provided with a protrusion adapted to the groove.

[0013] The outer gear ring is rotatably mounted on the mounting bracket of the first driving motor, and the outer gear ring is coaxially arranged with the sand material conveying pipe. The protective shell is sleeved on the periphery of the outer gear ring and is fixedly connected to the mounting bracket. The output end of the first driving motor is equipped with a first gear, a plurality of worm gears are rotatably mounted in the protective shell, the worm gears are circumferentially distributed on the periphery of the sand material conveying pipe, the second gear is mounted on the worm gear, and the protective shell is rotatably equipped with a second rotating shaft corresponding to the worm gear, the second rotating shaft is equipped with a worm gear and an L-shaped clamp arm for fitting and pressing the front end flange and the tail end flange; the dust collecting box near the side of the high-pressure sand tank is also provided with an active opening for the sand material conveying pipe and the clamping docking mechanism, and an annular dust shield brush is installed at the active opening.

[0014] Preferably, the circulating conveying mechanism includes a belt conveyor, and the belt conveyor is provided with a plurality of positioning channels, and the width of the input end of the positioning channel is greater than the width of the output end thereof.

[0015] Preferably, the circulating conveying mechanism also includes a pushing mechanism and an intercepting plate, which are located on the side of the steel pipe conveying mechanism facing away from the belt conveyor; the pushing mechanism includes a third power cylinder, a pushing plate and a push rod, the output end of the third power cylinder is connected to the pushing plate, and a plurality of push rods are fixed on the pushing plate, and the push rods are used to push the sandblasting assembly in the steel pipe at the unloading standby station to the circulating conveying mechanism; the intercepting plate is used to intercept the sandblasting assembly in the steel pipe at the loading standby station.

[0016] The technical solution has the following beneficial effects: by arranging multiple sandblasting components that can be separated from the sand material conveying pipe, after the sandblasting pipe passes through the steel pipe to complete the sandblasting process, the sandblasting pipe is separated from the sand material conveying pipe by the clamping docking structure, the steel pipe conveying mechanism removes the steel pipe and the sandblasting component inside the steel pipe together, and transports the steel pipe with the sandblasting component inserted at the loading standby station to the sandblasting station, and then the sandblasting pipe is connected to the sand material conveying pipe by the clamping docking structure, thereby saving the time of one-way invalid movement of the sandblasting component, shortening the processing interval time, and improving the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 For the top view of the present invention Figure 1 ;

[0019] Figure 3 For the top view of the present invention Figure 2 ;

[0020] Figure 4 For the top view of the present invention Figure 3 ;

[0021] Figure 5 For the top view of the present invention Figure 4 ;

[0022] Figure 6 Side view of the steel pipe conveying mechanism Figure 1 (Double-chain conveyor is at bottom dead center);

[0023] Figure 7 Side view of the steel pipe conveying mechanism Figure 2 (Double-chain conveyor is at top dead center);

[0024] Figure 8 It is a structural schematic diagram of the sandblasting component;

[0025] Figure 9 It is a cross-sectional view of the sandblasting assembly inside the steel pipe;

[0026] Figure 10 It is a structural diagram of the clamping docking mechanism;

[0027] Figure 11 It is a side view of the clamping docking mechanism;

[0028] Figure 12 Side view of the collection mechanism Figure 1 (The upper movable part is located at the bottom dead center);

[0029] Figure 13 Side view of the collection mechanism Figure 2 (The upper movable part is at the top dead center);

[0030] Figure 14 This is a state diagram of the rotary support mechanism and the pressure wheel assembly when they are working together;

[0031] Figure 15 It is a structural diagram of the steel pipe conveying mechanism and the rotating support mechanism;

[0032] In the figure, 1. sandblasting storage mechanism; 11. sand material conveying pipe; 12. high-pressure sand tank; 13. track; 14. track trolley; 15. tail end flange; 151. raised portion; 2. steel pipe conveying mechanism; 21. double-chain conveyor; 22. second fixed bracket; 23. second power cylinder; 24. accessories; 3. sandblasting assembly; 31. sandblasting tube; 32. sandblasting nozzle; 33. rotating support; 331. fourth fixed bracket; 332. universal ball; 34. front flange; 341. slot; 4. clamping docking mechanism; 401. mounting bracket; 402. protective shell; 403. first drive motor; 404. first gear; 405. second gear; 406. outer gear ring; 407. worm gear; 408. worm; 409. second rotating shaft; 410. L-shaped clamping arm; 5. circulating conveying mechanism; 51. belt conveyor; 52. Positioning channel; 53. Proximity switch; 54. Pushing mechanism; 541. Third power cylinder; 542. Pushing plate; 543. Push rod; 55. Intercepting plate; 6. Collecting mechanism; 61. First fixed bracket; 62. Dust collecting box; 621. Lower fixed part; 622. Upper movable part; 623. Semicircular opening; 624. Movable opening; 625. Annular dust-blocking brush; 63. First power cylinder; 64. Dust duct; 65. Pressure roller assembly; 7. Rotating support mechanism; 71. Third fixed bracket; 72. Second drive motor; 73. First rotating shaft; 74. Supporting roller; 75. Driven pulley; 76. Driving pulley; 77. Guide pulley; 78. Transmission belt; 81. Collecting trough; 82. Belt conveyor; 91. Steel pipe; 92. Loading standby station; 93. Sandblasting station; 94. Unloading standby station. Implementation Method

[0033] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0034] See also Figures 1 to 15, the embodiment of the present application provides a steel pipe inner surface treatment system, including a production line, the production line includes a sandblasting storage mechanism 1, a steel pipe conveying mechanism 2 and a sandblasting assembly 3, the sandblasting storage mechanism 1 includes a movable sand material conveying pipe 11 for conveying high-pressure sand material to the sandblasting assembly 3, the steel pipe conveying mechanism 2 is used to convey the steel pipe 91 through the loading standby station 92, the sandblasting station 93 and the unloading standby station 94 in sequence, the loading standby station 92 is close to the loading end of the steel pipe conveying mechanism 2, the unloading standby station 94 is close to the unloading end of the steel pipe conveying mechanism 2, and the sandblasting station 93 is located in the middle of the steel pipe conveying mechanism 2; in this embodiment, the sandblasting assembly 3 is set to four groups, and the number of sandblasting assemblies 3 in each group is 4; the sandblasting assembly 3 includes a sandblasting tube 31 and a sandblasting nozzle 32, the sand material conveying pipe 11 is a hard metal tube, and the sandblasting tube 31 is a hard metal tube. The output end is connected to the sandblasting nozzle 32, and the input end of the sandblasting tube 31 can be detachably and sealedly connected to the output end of the sand material conveying pipe 11 at the sandblasting station 93 through the clamping docking mechanism 4. The sandblasting tube 31 is connected to the sand material conveying pipe 11 through the clamping docking mechanism 4, so that sand is conveyed to the sandblasting nozzle 32. The sandblasting nozzle 32 can spray sand in all directions and spray it onto the inner wall of the steel pipe 91. By driving the steel pipe 91 to rotate, the sandblasting nozzle 32 moves linearly along the axis direction of the rotating steel pipe 91, so that the sandblasting nozzle 32 can spray sand evenly onto the inner surface of the steel pipe 91; two production lines are set, and the conveying directions of the steel pipe conveying mechanisms 2 of the two production lines are opposite. The sandblasting component 3 on the steel pipe conveying mechanism 2 and located at the unloading standby station 94 is conveyed to the loading standby station 92 on another steel pipe 91 conveyor through the circulating conveying mechanism 5. The sandblasting assembly 3 is designed to be separated from the sand material conveying pipe 11. After the sandblasting pipe 31 passes through the steel pipe 91 and completes the sandblasting process, the sandblasting pipe 31 is separated from the sand material conveying pipe 11 by the clamping docking mechanism 4. The steel pipe 91 carrying the sandblasting assembly 3 located inside it is driven and moved by the steel pipe conveying mechanism 2, and moves from the sandblasting station 93 to the unloading standby station 94. The steel pipe 91 at the loading standby station 92 has been inserted into the sandblasting assembly 3 and will move to the sandblasting station 93. After the docking structure connects the sandblasting pipe 31 with the sand material conveying pipe 11, sandblasting can be carried out directly, thereby saving the time of one-way invalid movement of the sandblasting assembly 3, shortening the processing interval time, and improving the processing efficiency.

[0035] To deliver high-pressure abrasive to the abrasive delivery pipe 11, the sandblasting storage mechanism 1 further includes a high-pressure sand tank 12, a track 13, and a track trolley 14. The track trolley 14 is rotatably mounted on the track 13, and the high-pressure sand tank 12 is mounted on the track trolley 14. The high-pressure sand tank 12 is connected to the input end of the abrasive delivery pipe 11. The track trolley 14 is driven by a stepper motor or a servo motor and can move along the track 13, thereby driving the abrasive delivery pipe 11 to move. The abrasive delivery pipe 11 is fixedly connected to the support frame on the track trolley 14, so that the abrasive delivery pipe 11 remains horizontal, facilitating its direct insertion into the steel pipe 91.

[0036] In order to collect the waste sand and waste chips escaping from both ends of the steel pipe 91 after sandblasting, the production line is provided with two collecting mechanisms 6. The collecting mechanism 6 includes a first fixed bracket 61, a dust collecting box 62 and a first power cylinder 63. The dust collecting box 62 is located on both sides of the steel pipe 91 at the sandblasting station 93 and surrounds both ends of the steel pipe 91. The sand material conveying pipe 11 can extend into the dust collecting box 62. The dust collecting box 62 is connected to the dust removal equipment through the dust pipe 64. The dust collecting box 62 includes a lower fixed part 621 and an upper movable part 622. The lower fixed part 621 and the upper movable part The movable part 622 can be spliced ​​into a box structure. A waste outlet is provided at the bottom of the lower fixed part 621. The waste in the dust box 62 is automatically discharged from the waste outlet due to gravity. The lower fixed part 621 and the upper movable part 622 are both provided with a semicircular opening 623 for the movement of the steel pipe 91 at one end facing the steel pipe conveying mechanism 2. The lower fixed part 621 is fixedly connected to the first fixed bracket 61. The first power cylinder 63 is fixedly installed on the top of the first fixed bracket 61 and is located above the dust box 62. The output end of the first power cylinder 63 is connected to the upper movable part 622. The first power cylinder 63 is a hydraulic cylinder. A guide rod slidably mounted on the first fixed bracket 61 can be provided on the side of the first power cylinder 63. The guide rod guides the lifting and lowering of the upper movable part 622. After the first power cylinder 63 drives the upper movable part 622 to rise to the upper dead point, the steel pipe conveying mechanism 2 can convey the steel pipe 91 to the sandblasting station 93 to avoid interference. When the steel pipe 91 descends to the semicircular opening 623 of the lower fixed part 621, the first power cylinder 63 drives the upper movable part 622 to descend to the lower dead point, so that the upper movable part 622 descends to contact with the lower fixed part 621. At this time, the two semicircular openings 623 form an opening surrounding the steel pipe 91, thereby reducing the removal of waste from the dust box 62 and not affecting the rotation of the steel pipe 91.

[0037] In order to stably transport the steel pipe 91 and drive it down to the semicircular opening 623 that is stuck in the dust box 62, a steel pipe conveying mechanism 2 is provided, which includes a double-chain conveyor 21, a second fixed bracket 22, and a second power cylinder 23. The second power cylinder 23 is mounted on the second fixed bracket 22. The output end of the second power cylinder 23 is connected to the double-chain conveyor 21 to drive the double-chain conveyor 21 to rise and fall linearly. A plurality of attachments 24 are fixed to the chain of the double-chain conveyor 21. The attachments 24 have inclined surfaces for contacting and cooperating with the steel pipe 91. The steel pipe 91 can be stuck between the inclined surfaces of two adjacent attachments 24, thereby stably transporting the steel pipe 91. The second power cylinder 23 is a hydraulic cylinder. There are four second power cylinders 23 and they are arranged in a rectangular shape. The four second power cylinders 23 work synchronously to stably drive the double-chain conveyor 21 to rise and fall. A guide rod slidably mounted on the second fixed bracket 22 is provided on the side of the second power cylinder 23. The guide rod guides the rise and fall of the double-chain conveyor 21, allowing the double-chain conveyor 21 to rise and fall smoothly and linearly.

[0038] In order to drive the steel pipe 91 of the sandblasting station 93 to rotate, so that the sandblasting nozzle 32 can evenly spray the sand material to different positions on the inner wall of the steel pipe 91, the production line is provided, which also includes a rotating support mechanism 7 located below the inner side of the double-chain conveyor 21. The rotating support mechanism 7 supports and drives the steel pipe 91 at the sandblasting station 93 to rotate; the rotating support mechanism 7 includes a third fixed bracket 71, a second drive motor 72, a first rotating shaft 73 and a supporting wheel 74. The third fixed bracket 71 is fixedly connected to the second fixed bracket 22. The third fixed bracket 7 1 is mounted with a second drive motor 72 and five first rotating shafts 73. The first rotating shafts 73 are mounted with a driven pulley 75 and two supporting rollers 74. The five first rotating shafts 73 can accommodate four steel pipes 91, and each steel pipe 91 can be supported and rotated stably by the four supporting rollers 74. A driving pulley 76 is mounted on the output end of the second drive motor 72. Multiple guide pulleys 77 are also rotatably mounted on the third fixed bracket 71. The driving pulley 76 is connected to the guide pulleys 77 and the driven pulley 75 via a transmission belt 78. The guide pulleys 77 guide the transmission belt 78 to prevent it from contacting the steel pipe 91. The steel pipes 91 are loaded onto the double-chain conveyor 21 and the loading standby station 92 through the loading equipment. Four steel pipes 91 are loaded each time. There is at least one installation position for the steel pipe 91 between the loading standby station 92, the sandblasting station 93 and the unloading standby station 94 to prevent the supporting wheel 74 from contacting the steel pipes 91 at the loading standby station 92 and the unloading standby station 94.

[0039] To ensure smooth linear movement of the sandblasting tube 31, the sandblasting assembly 3 further includes at least two rotating supports 33. The rotating supports 33 include a fourth fixed bracket 331 and at least two universal ball bearings 332. The fourth fixed bracket 331 is fixedly mounted on the sandblasting tube 31, and the universal ball bearings 332 are fixedly mounted on the fourth fixed bracket 331 and are circumferentially distributed around the outer periphery of the sandblasting tube 31. In this embodiment, two rotating supports 33 and three universal ball bearings 332 are provided. When the sandblasting tube 31 is within the circulating conveying mechanism 5 and the steel tube 91, it is supported by the rotating supports 33 and can maintain a horizontal posture. When the steel tube 91 rotates, the universal ball bearings 332 can roll in contact with the steel tube 91, without causing the sandblasting tube 31 to rotate, allowing the sandblasting tube 31 to move smoothly in a linear manner.

[0040] In order to enable the sandblasting tube 31 and the sand material conveying tube 11 to be quickly and accurately connected together, a front end flange 34 is provided at the input end of the sandblasting tube 31, and a tail end flange 15 is provided at the output end of the sand material conveying tube 11; a groove 341 with a trapezoidal cross-section is provided on the front end flange 34, and a protrusion 151 adapted to the groove 341 is provided on the tail end flange 15. The slot size of the groove 341 is larger than the groove bottom, and the size of one end of the protrusion 151 facing the groove 341 is smaller than the size of the other end. The design of the groove 341 and the protrusion 151 can play a guiding role, so that when the position of the sandblasting tube 31 and the sand material conveying tube 11 deviates and the axes are not coaxial, the front end flange 34 and the tail end flange 15 can be smoothly connected. Sealing rings can also be provided on the front end flange 34 and the tail end flange 15 to improve the sealing effect.

[0041] In order to quickly and stably connect the front end flange 34 and the tail end flange 15, a clamping docking mechanism 4 is provided, which includes a mounting frame 401, a protective shell 402, a first drive motor 403, a first gear 404, a second gear 405, an outer ring gear 406, a worm wheel 407, a worm 408, a second rotating shaft 409, and an L-shaped clamp arm 410. The mounting frame 401 is fixedly mounted on the sand material conveying pipe 11, and the outer ring gear 406 is rotatably mounted on the mounting frame 401 through a bearing and is coaxially arranged with the sand material conveying pipe 11. The protective shell 402 is sleeved on the periphery of the outer ring gear 406 and is fixedly connected to the mounting frame 401. The first drive motor 403 is fixedly connected to the protective shell 402. A first gear 404 is installed at the output end of the first drive motor 403. A plurality of worms 408 are rotatably installed in the protective shell 402 through bearings. In this embodiment, four worms 408 are provided, and the worms 408 are circumferentially distributed on the sand material conveying pipe 11. On the periphery of the material conveying pipe 11, a second gear 405 is installed on the worm 408, and a second rotating shaft 409 corresponding to the worm 408 is rotatably installed on the inner wall of the protective shell 402 through a bearing. A worm wheel 407 and an L-shaped clamp arm 410 engaged with the worm 408 are installed on the second rotating shaft 409. The L-shaped clamp arm 410 is used to fit and press the front flange 34 and the rear flange 15 together; the protective shell 402 is cylindrical and can protect the interior thereof. Each component, the first drive motor 403 uses a stepper motor, the first drive motor 403 drives the outer ring gear 406 to rotate through the first gear 404, the outer ring gear 406 drives the second gears 405 and the worm 408 to rotate, the worm 408 drives the worm wheel 407, the second rotating shaft 409, and the L-shaped clamp arm 410 to rotate, and when the L-shaped clamp arm 410 rotates towards each other, it contacts the front end flange 34 and presses the front end flange 34 onto the tail end flange 15.

[0042] To facilitate the movement of the clamping and docking mechanism 4 into and out of the dust box 62, a movable opening 624 for the sand supply pipe 11 and the movement of the clamping and docking mechanism 4 is provided on the end surface of the dust box 62, which is located near the high-pressure sand tank 12 and faces away from the semicircular opening 623. An annular dust-blocking brush 625 is installed at the movable opening 624. The annular dust-blocking brush 625 can reduce the movement of dust out of the dust box 62.

[0043] To facilitate the transport of the sandblasting assemblies 3, a circulating conveying mechanism 5 is provided, including a belt conveyor 51. The belt conveyor 51 is provided with a plurality of positioning channels 52. There are four positioning channels 52, the same number as each group of sandblasting assemblies 3. The positioning channels 52 are separated by a plurality of partitions. To facilitate the entry of the sandblasting assemblies 3 into the positioning channels 52 and to facilitate their accurate insertion into the steel pipe 91 at the loading standby position, the width of the input end of the positioning channel 52 is set to be greater than the width of the output end. The width of the output end of the positioning channel 52 is equal to or slightly greater than the inner diameter of the steel pipe 91. A proximity switch 53 can be provided at the discharge end of the positioning channel 52 to facilitate detection and control of the position of the sandblasting assemblies 3, thereby preventing the sandblasting assemblies 3 from being directly removed from the positioning channel 52.

[0044] In order to facilitate pushing the sandblasting assembly 3 in the steel pipe 91 at the unloading standby station 94 to the circulating conveying mechanism 5, the circulating conveying mechanism 5 is provided further comprising a pushing mechanism 54. The pushing mechanism 54 is located on the side of the steel pipe conveying mechanism 2 facing away from the circulating conveying mechanism 5. The pushing mechanism 54 is close to the loading standby station 92. The pushing mechanism 54 comprises a third power cylinder 541, a pushing plate 542 and a push rod 543. The output end of the third power cylinder 541 is connected to the pushing plate 542. A plurality of push rods 543 are fixed on the pushing plate 542. The push rods 543 are used to push the sandblasting assembly 3 in the steel pipe 91 at the unloading standby station 94 to the circulating conveying mechanism 5. The third power cylinder 541 is an air cylinder. The third power cylinder 541 is fixedly connected to the first fixed bracket 61 and its position remains fixed.

[0045] In order to facilitate limiting the circulating conveying mechanism 5 from pushing the sandblasting assembly 3 into the position of the steel pipe 91 at the loading standby station 92, and to prevent the sandblasting assembly 3 from slipping in the steel pipe 91 after leaving the circulating conveying mechanism 5, causing it to extend too long out of the steel pipe 91, the circulating conveying mechanism 5 is provided to also include an interception plate 55. The interception plate 55 is located on the side of the steel pipe conveying mechanism 2 facing away from the circulating conveying mechanism 5. The interception plate 55 is fixedly connected to the first fixed bracket 61. The interception plate 55 is used to intercept the sandblasting assembly 3 in the steel pipe 91 at the loading standby station 92, and to limit the sandblasting assembly 3.

[0046] In order to facilitate the collection of waste sand and other waste materials discharged from the waste outlet, a long strip collection trough 81 can also be set on the ground. A belt conveyor 82 is installed in the collection trough 81. The vertical projection of the waste outlet is located on the belt conveyor 82. The waste sand discharged from the waste outlet can fall into the belt conveyor 82 under gravity. The belt conveyor 82 transports the waste sand to its unloading end, which can facilitate the collection of the waste sand.

[0047] In order to prevent the steel pipe 91 from shaking and moving its axis during the sandblasting process and to ensure stable rotation of the steel pipe 91, four pressure wheel assemblies 65 can also be installed on the top of the upper movable part 622. The four pressure wheel assemblies 65 can press down the tops of the four steel pipes 91 located at the sandblasting station 93 respectively, and cooperate with the support wheel 74 to limit the circular runout of the steel pipe 91, ensure that the steel pipe 91 does not move axially, and ensure stable rotation of the steel pipe 91.

[0048] The working steps of the steel pipe inner surface treatment system of this embodiment are as follows:

[0049] S1, such as Figure 1 and Figure 2 As shown, at this time, the steel pipe 91 at the sandblasting station 93 is loaded with the sandblasting assembly 3, and the rail trolley 14 moves a short distance toward the steel pipe 91, so that the front flange 34 is close to the rear flange 15; then the clamping and docking mechanism 4 operates, and the first drive motor 403 drives the L-shaped clamp arm 410 to rotate. The L-shaped clamp arm 410 contacts the front flange 34, pressing the front flange 34 against the rear flange 15, thereby quickly connecting the front flange 34 and the rear flange 15;

[0050] S2, the second drive motor 72 drives the first rotating shaft 73 and the supporting wheel 74 to rotate, and the supporting wheel 74 drives the steel pipe 91 of the sandblasting station 93 to rotate; Figure 3As shown, the rail trolley 14 drives the high-pressure sand tank 12, the sand material conveying pipe 11, and the sandblasting assembly 3 to move away from the steel pipe 91, and the sandblasting assembly 3 is extracted from the steel pipe 91; the valve of the sand material conveying pipe 11 is opened, and the sand material conveying pipe 11 pressurizes and conveys the sand material in the high-pressure sand tank 12 to the sandblasting pipe 31, and the sandblasting nozzle 32 sprays the sand material evenly to different positions of the inner wall of the steel pipe 91 to perform sandblasting treatment on the inner surface of the steel pipe 91; during this period, the waste generated by sandblasting enters the dust collecting box 62, and the floating dust enters the dust removal equipment through the dust pipe 64, and the remaining waste is discharged from the waste outlet under gravity; during this period, the feeding equipment conveys the steel pipe 91 to be processed to the double chain conveyor During this time, the third power cylinder 541 drives the pushing plate 542 and the pushing rod 543 to move, and the pushing rod 543 pushes out the sandblasting assembly 3 in the steel pipe 91 at the unloading waiting station 94 on the double-chain conveyor 21, so that one end of the sandblasting assembly 3 abuts against the belt conveyor 51. The belt conveyor 51 drives the sandblasting assembly 3 to withdraw from the steel pipe 91 at the unloading waiting station 94 and transport the sandblasting assembly 3 to the loading waiting station 92 on the double-chain conveyor 21 of another production line. When the sandblasting assembly 3 moves to the unloading end of the belt conveyor 51, the conveying is stopped, and the sandblasting assembly 3 is ready to be inserted into the steel pipe 91 to be processed.

[0051] S3, such as Figure 4 As shown, after the sandblasting nozzle 32 moves out of the steel pipe 91, the rail trolley 14 stops, the valve of the sand material conveying pipe 11 is closed, and the second drive motor 72 stops working, no longer driving the steel pipe 91 to rotate; the clamping and docking mechanism 4 works, and the first drive motor 403 drives the L-shaped clamp arm 410 to rotate, and the L-shaped clamp arm 410 moves away from the front flange 34, and the rail trolley 14 moves a short distance away from the steel pipe 91, so that the front flange 34 moves away from the rear flange 15;

[0052] S4, such as Figure 13 As shown, the first power cylinder 63 drives the upper movable portion 622 to rise, thereby clearing the position where the steel pipe 91 rises; Figure 7 As shown, the second power cylinder 23 drives the double-chain conveyor 21 to rise, and the attachment 24 rises until it contacts the steel pipe 91 of the sandblasting station 93, and lifts the steel pipe 91 of the sandblasting station 93 again. The steel pipe 91 of the sandblasting station 93 rises above the supporting roller 74 and separates from the supporting roller 74; the double-chain conveyor 21 drives the steel pipe 91 to move, and the steel pipe 91 at the sandblasting station 93 is transported to the unloading standby station 94, and the steel pipe 91 at the loading standby station 92 is transported to the sandblasting station 93;

[0053] S5, such as Figure 6As shown, the second power cylinder 23 drives the double-chain conveyor 21 to descend, the steel pipe 91 of the sandblasting station 93 contacts the supporting wheel 74 and separates from the attachment 24, and the steel pipe 91 of the sandblasting station 93 descends into the semicircular opening 623 of the lower fixed portion 621. At the same time, the first power cylinder 63 drives the upper movable portion 622 to descend until it contacts the lower fixed portion 621. Figure 12 As shown, at this time, the two semicircular openings 623 form an opening surrounding the steel pipe 91, and the pressing wheel assembly 65 contacts the top of the steel pipe 91 to press the steel pipe 91, limiting the circular runout and axial movement of the steel pipe 91;

[0054] S6, the rail trolley 14 moves a short distance toward the steel pipe 91, so that the front flange 34 approaches the rear flange 15; the first drive motor 403 drives the L-shaped clamp arm 410 to rotate, and the L-shaped clamp arm 410 contacts the front flange 34, pressing the front flange 34 against the rear flange 15, thereby quickly connecting the front flange 34 and the rear flange 15; the second drive motor 72 drives the first rotating shaft 73 and the supporting wheel 74 to rotate, and the supporting wheel 74 drives the steel pipe 91 of the sandblasting station 93 to rotate; Figure 5 As shown, the rail trolley 14 drives the high-pressure sand tank 12, the sand material delivery pipe 11, and the sandblasting assembly 3 to move toward the steel pipe 91, and the sandblasting assembly 3 is inserted into the steel pipe 91; the valve of the sand material delivery pipe 11 is opened, and the sand material delivery pipe 11 pressurizes and delivers the sand material in the high-pressure sand tank 12 to the sandblasting pipe 31, and the sandblasting nozzle 32 evenly sprays the sand material to different positions on the inner wall of the steel pipe 91 to perform sandblasting on the inner surface of the steel pipe 91; during this period, the feeding equipment delivers the steel pipe 91 to be processed to the double chain conveyor The feeding standby station 92 on the conveyor 21; during this period, the feeding equipment transports the steel pipe 91 to be processed to the feeding standby station 92 on the double-chain conveyor 21. After the steel pipe 91 to be processed is loaded at the feeding standby station 92 on the double-chain conveyor 21, the belt conveyor 51 drives the sandblasting assembly 3 to move into the steel pipe 91 at the feeding standby station 92 until the sandblasting assembly 3 passes through the steel pipe 91 and abuts against the interception plate 55, so that the sandblasting assembly 3 is loaded into the steel pipe 91 and is ready for use;

[0055] S7, after the sandblasting nozzle 32 moves out of the steel pipe 91, the rail trolley 14 stops, the valve of the sand material conveying pipe 11 is closed, and the second drive motor 72 stops working and no longer drives the steel pipe 91 to rotate; the clamping and docking mechanism 4 works, and the first drive motor 403 drives the L-shaped clamp arm 410 to rotate, and the L-shaped clamp arm 410 moves away from the front flange 34, and the rail trolley 14 moves a short distance away from the steel pipe 91, so that the front flange 34 moves away from the rear flange 15, and the sandblasting assembly 3 is separated from the sand material conveying pipe 11 in the steel pipe 91;

[0056] In step S8, the first power cylinder 63 drives the upper movable part 622 to rise, the second power cylinder 23 drives the double-chain conveyor 21 to rise, and the attachment 24 rises until it contacts the steel pipe 91 of the sandblasting station 93, and lifts the steel pipe 91 of the sandblasting station 93 again. The steel pipe 91 of the sandblasting station 93 rises above the supporting roller 74 and separates from the supporting roller 74. The time taken for the one-way ineffective movement of the sandblasting assembly 3 is at least 6 seconds, and the longer the steel pipe 91 and the sandblasting tube 31 are, the longer the time taken. The total time taken for steps S7 and S8 is about 2 seconds, which is much less than the time taken for the one-way ineffective movement of the sandblasting assembly 3. Therefore, the time taken for the sandblasting process to be interrupted can be saved, and the processing efficiency can be improved.

[0057] S9, the double-chain conveyor 21 drives the steel pipe 91 to move, and the steel pipe 91 at the sandblasting station 93 and the sandblasting assembly 3 inside the steel pipe 91 are transported to the unloading standby station 94, and the steel pipe 91 at the loading standby station 92 and the sandblasting assembly 3 inside the steel pipe 91 are transported to the sandblasting station 93;

[0058] S10, loop S1 to S9.

[0059] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] The above embodiments merely illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

[0061] 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", "axial", "radial", "circumferential" and the like to 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, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0062] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0063] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

Claims

1. A steel pipe inner surface treatment system, comprising a production line, the production line comprising a sandblasting storage mechanism, a steel pipe conveying mechanism and a sandblasting assembly, the sandblasting storage mechanism comprising a movable sand material conveying pipe for conveying high-pressure sand material to the sandblasting assembly, the steel pipe conveying mechanism for conveying the steel pipe sequentially through a loading standby station, a sandblasting station and a unloading standby station, wherein: The sandblasting assembly includes a sandblasting tube and a sandblasting nozzle, the output end of the sandblasting tube is connected to the sandblasting nozzle, and the input end of the sandblasting tube is detachably and sealedly connected to the output end of the sand material conveying tube at the sandblasting station through a clamping docking mechanism; the production lines are provided with two, and the conveying directions of the steel pipe conveying mechanisms of the two production lines are opposite. The sandblasting assembly located at the unloading standby station on the steel pipe conveying mechanism is conveyed to the loading standby station on another steel pipe conveyor through a circulating conveying mechanism; The input end of the sandblasting tube is provided with a front flange, and the output end of the sand conveying tube is provided with a tail flange; the front flange is provided with a groove with a trapezoidal cross section, and the tail flange is provided with a protrusion adapted to the groove; The worm gear is meshed with the worm gear of the first and second gears and is meshed with the worm gear of the second gear. The circulating conveying mechanism includes a belt conveyor, which is provided with a plurality of positioning channels, wherein the width of the input end of the positioning channel is greater than the width of the output end thereof; The circulating conveying mechanism also includes a pushing mechanism and an intercepting plate, which are located on the side of the steel pipe conveying mechanism facing away from the belt conveyor; the pushing mechanism includes a third power cylinder, a pushing plate and a push rod, the output end of the third power cylinder is connected to the pushing plate, and a plurality of push rods are fixed on the pushing plate, which are used to push the sandblasting assembly in the steel pipe at the unloading standby station to the circulating conveying mechanism; the intercepting plate is used to intercept the sandblasting assembly in the steel pipe at the loading standby station.

2. The steel pipe inner surface treatment system according to claim 1, characterized in that: The sandblasting storage mechanism further comprises a high-pressure sand tank, a track, and a track trolley. The track trolley is rollingly mounted on the track. The high-pressure sand tank is mounted on the track trolley. The high-pressure sand tank is connected to the input end of the sand material conveying pipe.

3. The steel pipe inner surface treatment system according to claim 1, characterized in that: The production line also includes two collecting mechanisms, which include a first fixed bracket, a dust collecting box and a first power cylinder. The dust collecting box is located on both sides of the steel pipe at the sandblasting station and surrounds both ends of the steel pipe. The sand material conveying pipe can extend into the dust collecting box. The dust collecting box is connected to the dust removal equipment through a dust pipe. The dust collecting box includes a lower fixed part and an upper movable part. A waste outlet is provided at the bottom of the lower fixed part. A semicircular opening for the movement of the steel pipe is provided at one end of the lower fixed part and the upper movable part facing the steel pipe conveying mechanism. The lower fixed part is fixedly connected to the first fixed bracket. The first power cylinder is fixedly installed on the top of the first fixed bracket and is located above the dust collecting box. The output end of the first power cylinder is connected to the upper movable part.

4. The steel pipe inner surface treatment system according to claim 1, characterized in that: The steel pipe conveying mechanism includes a double-chain conveyor, a second fixed bracket and a second power cylinder. The second power cylinder is installed on the second fixed bracket. The output end of the second power cylinder is connected to the double-chain conveyor to drive the double-chain conveyor to rise and fall linearly. Several accessories are fixed on the chain of the double-chain conveyor. The accessories have an inclined surface for contacting and cooperating with the steel pipe. The steel pipe can be clamped between the inclined surfaces of two adjacent accessories.

5. The steel pipe inner surface treatment system according to claim 1, characterized in that: The production line also includes a rotating support mechanism located at the lower inner side of the double-chain conveyor, which supports and drives the steel pipe at the sandblasting station to rotate; the rotating support mechanism includes a third fixed bracket, a second drive motor, a first rotating shaft and a supporting roller, the third fixed bracket is equipped with a second drive motor and multiple first rotating shafts, the first rotating shaft is equipped with a driven pulley and at least two supporting rollers, the output end of the second drive motor is equipped with a driving pulley, and the third fixed bracket is also rotatably equipped with multiple guide pulleys, and the driving pulley is connected to the guide pulley and the driven pulley through a transmission belt.

6. The steel pipe inner surface treatment system according to claim 1, characterized in that: The sandblasting components are arranged in four groups, with the number of sandblasting components in each group being 1 to 8; the sandblasting components also include at least two rotating supports, the rotating supports include a fourth fixed bracket and at least two universal ball bearings, the fourth fixed bracket is fixedly mounted on the sandblasting tube, and the universal ball bearings are fixedly mounted on the fourth fixed bracket and are circumferentially distributed around the periphery of the sandblasting tube.

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