PPH Plastic Storage Tank Internal and External Synchronous Welding Equipment and Welding Process

Abstract

This application relates to the field of PPH storage tank welding technology, specifically disclosing equipment and welding process for simultaneous internal and external welding of PPH plastic storage tanks. It includes a tank conveying slide rail, an outer welding slide rail, and an inner welding support fixed to the ground. A power support with multiple power rollers arranged on both sides is slidably mounted on the tank conveying slide rail. An inner welding machine is fixed to the inner welding support, and an outer welding machine is slidably connected to the outer welding slide rail. A support base is slidably connected to the tank conveying slide rail, and a hydraulic lifting frame is fixed to the support base. A horizontal arm is rotatably connected to the hydraulic lifting frame, and multiple connecting rods are mounted on the horizontal arm. The ends of the connecting rods are equipped with suction cups parallel to the central axis of the tank body. A primary detection component is mounted on the horizontal arm to check the alignment of the central axis of the tank bottom with the horizontal arm. A secondary detection mechanism is mounted on the inner welding machine to check the alignment of the tank bottom with the central axis of the tank body. This application has the advantages of shortening welding time and improving welding accuracy.

Description

Technical Field

[0001] This application relates to the field of PPH tank welding technology, and in particular to equipment and welding process for simultaneous internal and external welding of PPH plastic storage tanks. Background Technology

[0002] PPH (polypropylene homopolymer) is a commonly used thermoplastic. PPH plastic storage tanks are tanks made of PPH material. These tanks have excellent chemical resistance, temperature resistance, corrosion resistance and non-toxicity. These properties make PPH storage tanks highly safe and reliable when storing and handling chemical substances.

[0003] The fabrication of PPH storage tanks generally involves: extrusion winding of the tank body, external welding, internal welding, pipe installation, and quality inspection. External welding involves placing the tank bottom on a turntable, then placing the tank body on the bottom. An extrusion welding machine is then used to heat-melt new PPH granules at the weld between the tank body and the bottom, making them a single unit. Internal welding uses a long-arm extrusion welding machine to heat-melt new PPH granules at the junction of the tank body and the bottom, further strengthening the structural stability of the storage tank and eliminating potential leakage risks.

[0004] Regarding the aforementioned technologies, the inventors believe that the following defects exist: When welding the tank body to the tank bottom, the tank body and tank bottom need to be transported to the external welding station for rotary welding first, and then the tank after external welding is transported to the internal welding station for internal welding. The welding process is relatively complicated and time-consuming. At the same time, during external welding, only a simple fixture on the turntable is used to position the tank bottom, making the central axes of the tank body and tank bottom collinear, resulting in low accuracy. Summary of the Invention

[0005] To address the issues of long welding times and low precision in the welding process between the tank body and the tank bottom, this application provides equipment and welding process for simultaneous internal and external welding of PPH plastic storage tanks.

[0006] The PPH plastic storage tank synchronous welding equipment provided in this application adopts the following technical solution:

[0007] PPH plastic storage tank internal and external synchronous welding equipment and welding process, including a tank conveying slide rail, an outer welding slide rail, and an inner welding support fixed to the ground. The tank conveying slide rail is slidably equipped with a power support with multiple power rollers arranged on both sides. The inner welding support is fixedly connected to an inner welding machine, the outer welding slide rail is slidably connected to an outer welding machine, the tank conveying slide rail is slidably connected to a support base, the support base is fixedly connected to a hydraulic lifting frame, the hydraulic lifting frame is horizontally rotatably connected to a cross arm, the extension line of the cross arm is equidistant from the distance between the two power rollers on the power support, the cross arm is provided with multiple connecting rods, the end of the connecting rods is provided with a suction cup parallel to the central axis of the tank body, the cross arm is provided with a primary detection component for detecting the alignment of the central axis of the tank bottom with the cross arm, and the inner welding machine is provided with a secondary detection mechanism for detecting the alignment of the tank bottom with the central axis of the tank body.

[0008] The primary detection assembly includes an adjusting cylinder slidably mounted on the cross arm, multiple laser rangefinders hinged to the cross arm, an electric push rod fixed to the cross arm, and a movable rod hinged to the adjusting cylinder. The laser rangefinders are evenly distributed around the circumference of the cross arm, and are located at the end of the adjusting cylinder away from the bottom of the tank. The movable rod is hinged to the laser rangefinders, and the laser rangefinders illuminate the edge of the bottom of the tank near the suction cup.

[0009] By adopting the above technical solution, the support base is moved on the conveyor rail, so that the distance between the suction cup and the inner welding machine is greater than the length of the tank plus the thickness of the tank bottom. The tank is placed on the power support, and then the tank bottom is moved to the suction cup. The adjusting cylinder is pushed and pulled by the electric push rod so that the laser emitted by the laser rangefinder is irradiated on the edge of the tank bottom near the horizontal arm. At this time, the central axis of the tank bottom is collinear with the horizontal arm, and the detection accuracy is high. Then, the support base is moved to make the tank bottom fit with the tank body. Then, the secondary detection mechanism checks whether the tank bottom is collinear with the central axis of the tank body. When the tank bottom and the tank body are correctly aligned, the outer welding machine and the inner welding machine are turned on to perform welding operations on the inner and outer sides of the junction of the tank body and the tank bottom simultaneously, which greatly shortens the total time of inner and outer welding.

[0010] Optionally, the secondary detection mechanism includes a fixed magnetic rod fixed to the end of the cross arm near the inner welding machine, an electric lifting rod fixed to the inner welding machine, a movable magnetic needle movably mounted on the electric lifting rod, a laser emitter fixed to the end of the movable magnetic needle away from the fixed magnetic rod, and a transparent target with a target ring fixed to the output end of the electric lifting rod. The magnetic poles of the fixed magnetic rod and the movable magnetic needle at their respective proximal ends are opposite in polarity. When the movable magnetic needle is in a free state, the output end of the laser emitter is directly facing the target's center. The electric lifting rod is also provided with a universal motion component that facilitates the movement of the movable magnetic needle according to the position of the fixed magnetic rod.

[0011] By adopting the above technical solution, after the bottom of the tank and the tank body are in contact, the laser emitter is turned on, and it is observed whether the movable magnetic needle moves through the universal motion component. After the movable magnetic needle is stable, it is observed whether the laser emitted by the laser emitter illuminates the target's center. If the laser emitted by the laser emitter illuminates the target's center, the central axes of the tank body and the bottom of the tank are collinear. Otherwise, the central axes of the tank body and the bottom of the tank are not aligned. In this case, it is necessary to adjust the hydraulic lifting frame to adjust the height of the bottom of the tank until the laser emitted by the laser emitter illuminates the target's center. At this time, the central axis of the bottom of the tank and the central axis of the tank body are aligned, with high accuracy and no need for excessive manual operation.

[0012] Optionally, the universal motion assembly includes a concave frame fixed to the output end of the electric lifting rod, an outer rotating ring rotatably connected to the concave frame, and an inner rotating ring rotatably connected within the outer rotating ring. The movable magnetic needle and the laser emitter are fixed to the diameter of the inner rotating ring. The electric lifting rod is equidistant from the power rollers on both sides of the power support. When the movable magnetic needle is in a free state, the rotation axis between the outer rotating ring and the concave frame is horizontal and perpendicular to the central axis of the tank. The rotation axis between the inner rotating ring and the outer rotating ring is vertical. The straight line formed by the movable magnetic needle and the laser emitter is parallel to the central axis of the tank.

[0013] By adopting the above technical solution, the magnetic force of the fixed magnetic rod acts on the movable magnetic needle at the bottom of the tank. The movable magnetic needle tends to point towards the end of the fixed magnetic rod that is close to the movable magnetic needle. When the movable magnetic needle tends to tilt in the vertical direction, the outer ring rotates, causing the end of the movable magnetic needle close to the fixed magnetic rod to tilt accordingly. When the movable magnetic needle tends to move in a direction other than the vertical direction, the outer ring and the inner ring cooperate with each other to make the movable magnetic needle and the laser emitter move smoothly, with good mobility, thereby effectively improving the detection accuracy.

[0014] Optionally, a reflector is fixed above the target, and an angle-adjustable vision sensor is installed on the inner welding machine. The vision sensor monitors the target through the reflection of the reflector, and the vision sensor is electrically connected to the power support, the outer welding machine, and the inner welding machine respectively.

[0015] By adopting the above technical solution, during the welding operation, the vision sensor monitors the target's specific situation in real time through the reflection of the reflector. When the laser illuminating the target deviates from the target center, the vision sensor sends a signal to stop the inner welding machine, outer welding machine, and power support from operating, so as to prevent the tank bottom from shifting on the tank body.

[0016] Optionally, a gravity block is threadedly connected below the center of gravity of the system consisting of the movable magnetic needle and the laser emitter.

[0017] By adopting the above technical solution, the distance between the gravity block and the movable magnetic needle is adjusted by twisting the gravity block. When the distance between the gravity block and the movable magnetic needle is greater, that is, the center of gravity of the system composed of the gravity block, the movable magnetic needle and the laser emitter is lower, the amplitude of the movable magnetic needle swaying is smaller, the frequency is lower, and the movable magnetic needle returns to a stationary speed faster after the bottom of the tank is calibrated. However, the allowable error range will be larger. Conversely, when the distance between the gravity block and the movable magnetic needle is closer, the movable magnetic needle is more sensitive and the allowable error range is smaller.

[0018] Optionally, a fixed cover is fixedly connected to the cross arm, and a rotating disk is rotatably connected to the cross arm inside the fixed cover. The two end faces of the rotating disk are respectively provided with toothed grooves and threaded grooves. A movable rod is slidably connected inside the fixed cover and threadedly connected to the threaded groove of the rotating disk. The connecting rod is disposed on the movable rod. A bevel gear is rotatably connected to the fixed cover and meshes with the toothed groove of the rotating disk.

[0019] By adopting the above technical solution, before welding, the bevel gear is rotated, causing the rotating disk to rotate accordingly. The rotating disk drives the moving rod to move radially along the rotating disk, thereby causing the connecting rod to move closer to or away from the horizontal arm. This allows the suction cups to contract or expand relative to each other. In other words, when positioning tank bottoms of different sizes, the suction cups are adjusted so that they are located relatively far from the central axis of the tank bottom, thereby improving the stability of the tank bottom during positioning and rotation, and effectively adapting to tank bottoms of various sizes.

[0020] Optionally, a fixed sleeve corresponding to each of the connecting rods is fixedly connected to the fixed cover. The connecting rod is slidably connected to the fixed sleeve. The end of the moving rod away from the rotating disk is rotatably connected to an extender gear. The inner wall of the fixed cover near the extender gear and the inner wall of the connecting rod near the extender gear are both provided with tooth grooves that mesh with the extender gear.

[0021] By adopting the above technical solution, when the moving rod moves, the range extender gear rotates due to the influence of the tooth groove of the fixed sleeve, and the connecting rod is driven by the range extender gear. The displacement distance of the connecting rod is equal to the displacement distance of the range extender gear and the rotation distance of the range extender gear, which further increases the extension and retraction stroke of the connecting rod in the fixed sleeve, that is, increases the distance of contraction or expansion between the suction cups, and further adapts to more sizes of tank bottoms.

[0022] Optionally, a laser Doppler vibrator is fixedly attached to both the side of the inner welding machine that rotates away from the tank and the side of the outer welding machine that rotates away from the tank.

[0023] By adopting the above technical solution, when the inner welding machine and the outer welding machine are welding synchronously, the laser Doppler vibrator monitors the weld in real time to determine whether there are defects in the weld.

[0024] The simultaneous internal and external welding process for PPH plastic storage tanks includes the following steps:

[0025] S1. Adjust the suction cup and place the tank: Rotate the bevel gear according to the tank bottom size to adjust the distance between the suction cup and the horizontal arm, and adjust the position of the support base on the tank conveying slide rail so that the distance between the suction cup and the inner welding machine is greater than the length of the tank plus the thickness of the tank bottom. Then place the tank on the power roller of the power support.

[0026] S2. Positioning and transporting the bottom of the can: Move the bottom of the can to the suction cup, and push the adjusting cylinder with the electric push rod to simultaneously change the tilt angle of all laser rangefinders until the laser emitted by all laser rangefinders illuminates the edge of the bottom of the can near the laser emitter. If the laser emitted by a laser rangefinder exceeds the edge of the bottom of the can, and the laser emitted by the remaining laser rangefinders is still on the bottom of the can, then the position of the bottom of the can is biased toward the direction opposite to the laser emitter that exceeds the edge. When the central axis of the bottom of the can is aligned with the cross arm, the suction cup holds the bottom of the can, and then the support base moves until the bottom of the can is against the can body.

[0027] S3. Detect the relative position between the tank body and the tank bottom: Adjust the height of the electric lifting rod by the tank body size so that the movable magnetic needle is located at the central axis of the tank body. When the movable magnetic needle is deflected by the fixed magnetic rod, that is, when the laser emitted by the laser emitter on the target does not hit the target center, the central axis of the tank bottom is not collinear with the central axis of the tank body. When the laser emitted by the laser emitter hits the target center, the central axis of the tank bottom is collinear with the central axis of the tank body.

[0028] S4. Welding: When the tank body and tank bottom are in the correct position, turn on the internal welding machine, external welding machine and power support to simultaneously perform internal and external welding between the tank body and tank bottom until the tank body rotates one full turn and the welding is completed.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] 1. After calibration by the primary testing components and secondary testing mechanisms, the tank bottom is fitted to the tank body. The external welding machine and the internal welding machine are then turned on to perform welding operations on the inner and outer sides of the junction between the tank body and the tank bottom simultaneously, which effectively shortens the total welding time of the inner and outer parts and improves welding efficiency.

[0031] 2. The electric push rod pushes and pulls the adjusting cylinder so that the laser emitted by the laser rangefinder is all illuminating the edge of the bottom of the tank near the horizontal arm. At this time, the central axis of the bottom of the tank is collinear with the horizontal arm. If one of the laser beams deviates from the bottom of the tank, then the central axis of the bottom of the tank is not aligned with the horizontal arm. This detection process is simple and highly accurate.

[0032] 3. When the bottom of the tank is in contact with the tank body, after the movable magnetic needle is stable, turn on the laser emitter. If the laser emitted by the laser emitter shines on the target center, the movable magnetic needle is facing the fixed magnetic rod, indicating that the central axes of the tank body and the bottom of the tank are collinear. Conversely, if the laser deviates from the target center, the central axes of the tank body and the bottom of the tank are not aligned, thus further enhancing the accuracy before welding.

[0033] 4. By rotating the gravity block, the distance between the gravity block and the movable magnetic needle can be adjusted. When the distance between the gravity block and the movable magnetic needle is greater, the center of gravity of the system consisting of the gravity block, the movable magnetic needle, and the laser emitter is lower. At this time, the amplitude and frequency of the movable magnetic needle's sway are smaller, which makes the movable magnetic needle return to stillness faster after the bottom of the tank is calibrated, i.e. after the fixed magnetic rod and the movable magnetic needle are realigned. However, the allowable error range of the lower-positioned gravity block is larger. Conversely, when the distance between the gravity block and the movable magnetic needle is closer, the center of gravity of the system consisting of the gravity block, the movable magnetic needle, and the laser emitter is higher, the movable magnetic needle is more sensitive, and the allowable error range is smaller. Thus, the error range of the relative timing between the bottom of the tank and the tank body can be adjusted according to the actual working conditions.

[0034] 5. Before welding, rotate the bevel gear to make the rotating disk rotate accordingly. The rotating disk drives the moving rod to move radially along the rotating disk. When the moving rod moves, the range extender gear rotates due to the influence of the tooth groove of the fixed sleeve. The connecting rod is driven by the range extender gear, which in turn moves the connecting rod closer to or away from the cross arm until the suction cup is located in a suitable position on the bottom of the tank. This improves the stability of the tank bottom during positioning and rotation, so as to adapt to tank bottoms of various sizes. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0036] Figure 2 This application is used to illustrate a partial structural diagram of the tank conveyor rail, support base, cross arm, connecting rod, suction cup, primary detection assembly, fixed magnetic rod, fixed cover, rotating disk, moving rod, bevel gear, fixed sleeve and range extender gear;

[0037] Figure 3 This application is mainly used to show the structural schematic diagram of the internal welding machine, cross arm, secondary detection mechanism, laser Doppler vibrator, reflector and vision sensor;

[0038] Figure 4 yes Figure 3 An enlarged schematic diagram of part A in the middle.

[0039] Reference numerals: 11. Tank conveying slide rail; 111. Support base; 112. Hydraulic lifting frame; 12. Outer welded slide rail; 13. Inner welded bracket; 14. Power support; 21. Inner welding machine; 22. Outer welding machine; 31. Cross arm; 32. Connecting rod; 33. Suction cup; 4. Primary detection assembly; 41. Adjusting cylinder; 42. Laser rangefinder; 43. Electric push rod; 44. Movable rod; 51. Fixed magnetic rod; 52. Electric lifting rod; 53. Movable... 531. Moving magnetic needle; 54. Gravity block; 55. Laser emitter; 56. Target; 57. Lifting plate; 58. Universal motion assembly; 59. Concave frame; 50. Outer rotating ring; 51. Inner rotating ring; 6. Laser Doppler vibrator; 72. Reflector; 83. Vision sensor; 84. Fixed cover; 85. Rotating disk; 86. Moving rod; 97. Bevel gear; 98. Fixed sleeve; 99. Extending gear; 90. Tank body; 91. Tank bottom. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0041] Example 1

[0042] This application discloses equipment and welding process for simultaneous internal and external welding of PPH plastic storage tanks. (Refer to...) Figure 1 and Figure 2The PPH plastic storage tank internal and external synchronous welding equipment includes PPH plastic storage tank internal and external synchronous welding equipment and welding process, including a tank conveying slide rail 11 fixed to the ground, an outer welding slide rail 12, and an inner welding support 13. A power support 14 with multiple power rollers arranged on both sides is slidably mounted on the tank conveying slide rail 11. An inner welding machine 21 is fixed to the inner welding support 13. An outer welding machine 22 (both the outer welding machine 22 and the power support 14 move via rollers, not shown in the figure) is slidably connected to the outer welding slide rail 12. A support base 111 is slidably connected to the tank conveying slide rail 11. A hydraulic lifting frame 112 is fixedly connected to 111. A horizontal arm 31 is rotatably connected to the hydraulic lifting frame 112. The extension line of the horizontal arm 31 is equidistant from the two power rollers on the power support 14. Multiple connecting rods 32 are provided on the horizontal arm 31. The end of the connecting rod 32 is provided with a suction cup 33 whose suction force is parallel to the central axis of the tank body 91. A primary detection component 4 is provided on the horizontal arm 31 for detecting the alignment of the central axis of the tank bottom 92 with the horizontal arm 31. A secondary detection mechanism is provided on the inner welding machine 21 for detecting the alignment of the central axis of the tank bottom 92 with the central axis of the tank body 91. The primary detection component 4 includes an adjusting cylinder 41 that is slidably sleeved on the cross arm 31, a plurality of laser rangefinders 42 that are hinged to the cross arm 31, an electric push rod 43 that is fixed to the cross arm 31, and a movable rod 44 that is hinged to the adjusting cylinder 41. In this application, there are four laser rangefinders 42, and the four laser rangefinders 42 are evenly distributed around the circumference of the cross arm 31. The laser rangefinders 42 are located at the end of the adjusting cylinder 41 away from the bottom of the tank 92. The movable rod 44 is hinged to the laser rangefinders 42. The laser rangefinders 42 illuminate the edge of the bottom of the tank 92 near the suction cup 33.

[0043] The support base 111 is moved on the conveyor rail 11 so that the distance between the suction cup 33 and the inner welding machine 21 is greater than the length of the tank body 91 plus the thickness of the tank bottom 92. The tank body 91 is placed on the power support 14, and then the tank bottom 92 is moved to the suction cup 33. The adjusting cylinder 41 is pushed and pulled by the electric push rod 43 so that the laser emitted by the laser rangefinder 42 is irradiated on the edge of the tank bottom 92 near the cross arm 31. At this time, the central axis of the tank bottom 92 is collinear with the cross arm 31, and the detection accuracy is high. Then the support base 111 is moved so that the tank bottom 92 is in contact with the tank body 91. Then the secondary detection mechanism checks whether the tank bottom 92 is collinear with the central axis of the tank body 91. When the tank bottom 92 and the tank body 91 are correctly aligned, the outer welding machine 22 and the inner welding machine 21 are turned on to perform welding operations on the inner and outer sides of the junction of the tank body 91 and the tank bottom 92 simultaneously, which greatly shortens the total time of inner and outer welding. Meanwhile, laser Doppler vibrators 6 are fixedly attached to both the inner welding machine 21 on the side facing away from the tank 91 and the outer welding machine 22 on the side facing away from the tank 91. When the inner welding machine 21 and the outer welding machine 22 are welding synchronously, the laser Doppler vibrators 6 monitor the weld in real time to determine whether there are defects in the weld.

[0044] Reference Figure 3 and Figure 4 The secondary detection mechanism includes a fixed magnetic rod 51 fixed to one end of the cross arm 31 near the inner welding machine 21, an electric lifting rod 52 fixed to the inner welding machine 21, a lifting plate 56 fixed to the output end of the electric lifting rod 52, a movable magnetic needle 53 movably mounted on the lifting plate 56, a laser emitter 54 fixed to one end of the movable magnetic needle 53 away from the fixed magnetic rod 51, and a transparent target 55 with a target ring printed on it fixed to the lifting plate 56. A reflector 71 is fixed above the target 55. A vision sensor 72 is hinged to the inner welding machine 21 via an adjustable angle hinge. The vision sensor 72 monitors the target 55 through the reflection of the reflector 71. The vision sensor 72 is electrically connected to the power support 14, the outer welding machine 22, and the inner welding machine 21, respectively. The magnetic poles of the fixed magnetic rod 51 and the movable magnetic needle 53 at their close ends are opposite in polarity. When the movable magnetic needle 53 is in a free state, the output end of the laser emitter 54 is directly facing the center of the target 55. The electric lifting rod 52 is also equipped with a universal motion component 57 that facilitates the movement of the movable magnetic needle 53 according to the position of the fixed magnetic rod 51.

[0045] After the tank bottom 92 is aligned with the tank body 91, the height of the electric lifting rod 52 is adjusted based on the pre-known dimensions of the tank body 91, so that the movable magnetic needle 53 is positioned at the height of the central axis of the tank body 91. Then, the laser emitter 54 is activated. The laser emitted by the laser emitter 54 is observed, either through the visual sensor 72 or manually, to see if it illuminates the center of the target 55. If the laser emitted by the laser emitter 54 illuminates the center of the target 55, then the central axes of the tank body 91 and the tank bottom 92 are collinear. Otherwise, the central axes of the tank body 91 and the tank bottom 92 are not aligned, and the hydraulic lifting frame needs to be adjusted. The height of the tank bottom 92 is adjusted by 112 until the laser emitted by the laser emitter 54 illuminates the center of the target 55. At this time, the central axis of the tank bottom 92 is aligned with the central axis of the tank body 91, with high precision and no need for much manual operation. During the welding operation, the vision sensor 72 also monitors the specific situation of the target 55 in real time through the reflection of the reflector 71. When the laser illuminating the target 55 deviates from the center, the vision sensor 72 sends a signal to stop the inner welding machine 21, the outer welding machine 22 and the power support 14 to prevent the tank bottom 92 from shifting on the tank body 91.

[0046] Reference Figure 1 and Figure 4The omnidirectional motion assembly 57 includes a concave frame 571 fixed to the output end of the electric lifting rod 52, an outer rotating ring 572 rotatably connected to the concave frame 571, and an inner rotating ring 573 rotatably connected within the outer rotating ring 572. A movable magnetic needle 53 and a laser emitter 54 are fixed to the diameter of the inner rotating ring 573. The electric lifting rod 52 is equidistant from the two power rollers on the power support 14. When the movable magnetic needle 53 is in a free state, the rotation axis between the outer rotating ring 572 and the concave frame 571 is horizontal and perpendicular to the central axis of the tank 91; the rotation axis between the inner rotating ring 573 and the outer rotating ring 572 is vertical; and the straight line formed by the movable magnetic needle 53 and the laser emitter 54 is parallel to the central axis of the tank 91. A gravity block 531 is threadedly connected below the center of gravity of the system composed of the movable magnetic needle 53 and the laser emitter 54.

[0047] The magnetic force of the fixed magnetic rod 51 acts on the movable magnetic needle 53 through the bottom 92 of the can. The movable magnetic needle 53 tends to point towards the end of the fixed magnetic rod 51 closest to the movable magnetic needle 53. When the movable magnetic needle 53 tends to tilt vertically, the outer rotating ring 572 rotates, causing the end of the movable magnetic needle 53 closest to the fixed magnetic rod 51 to tilt accordingly. When the movable magnetic needle 53 tends to move in a direction other than vertical, the outer and inner rings cooperate to allow the movable magnetic needle 53 and the laser emitter 54 to move smoothly, resulting in good mobility and effectively improving detection accuracy. The distance between the gravity block 531 and the movable magnetic needle 53 is adjusted by twisting the gravity block 531. When the distance between the gravity block 531, the movable magnetic needle 53, and the laser emitter 54 are far, the center of gravity of the system is low. At this time, the amplitude and frequency of the swaying of the movable magnetic needle 53 are smaller, which makes the movable magnetic needle 53 return to stillness faster after the bottom of the tank 92 is calibrated, that is, after the fixed magnetic rod 51 and the movable magnetic needle 53 are realigned. However, the gravity block 531, which is lower in position, has a larger allowable error range. Conversely, when the distance between the gravity block 531 and the movable magnetic needle 53 is closer, the center of gravity of the system consisting of the gravity block 531, the movable magnetic needle 53, and the laser emitter 54 is higher, the movable magnetic needle 53 is more sensitive, and the allowable error range is smaller. Thus, the error range of the relative alignment between the bottom of the tank 92 and the tank body 91 can be adjusted according to the actual working conditions.

[0048] Reference Figure 2A fixed cover 81 is fixedly connected to the cross arm 31. A rotating disk 82 is rotatably connected to the cross arm 31 inside the fixed cover 81. The two ends of the rotating disk 82 are respectively provided with toothed grooves and threaded grooves. A movable rod 83 is slidably connected inside the fixed cover 81 and threadedly connected to the threaded groove of the rotating disk 82. A connecting rod 32 is provided on the movable rod 83. A bevel gear 84 is rotatably connected to the fixed cover 81 and meshes with the toothed groove of the rotating disk 82. A fixed sleeve 85 corresponding to the connecting rod 32 is fixedly connected to the fixed cover 81. The connecting rod 32 is slidably connected to the fixed sleeve 85. A range extender gear 86 is rotatably connected to the end of the movable rod 83 away from the rotating disk 82. The inner wall of the fixed cover 81 near the range extender gear 86 and the inner wall of the connecting rod 32 near the range extender gear 86 are both provided with toothed grooves that mesh with the range extender gear 86.

[0049] Before welding, the bevel gear 84 is rotated, causing the rotating disk 82 to rotate as well. The rotating disk 82 drives the moving rod 83 to move radially along the rotating disk 82. When the moving rod 83 moves, the range extender gear 86 rotates due to the influence of the tooth groove of the fixed sleeve 85. The connecting rod 32 is driven by the range extender gear 86, which in turn causes the connecting rod 32 to move closer to or away from the cross arm 31, so that the suction cups 33 can contract or expand with each other. That is, when positioning tank bottoms 92 of different sizes, the suction cups 33 are adjusted so that the suction cups 33 are located relatively away from the central axis of the tank bottom 92, thereby improving the stability of the tank bottom 92 during positioning and rotation, and effectively adapting to tank bottoms 92 of various sizes.

[0050] The implementation principle of the PPH plastic storage tank internal and external synchronous welding equipment and welding process in this application embodiment is as follows: Before welding, the bevel gear 84 is rotated, causing the rotating disk 82 to rotate accordingly. The rotating disk 82 drives the moving rod 83 to move radially along the rotating disk 82. When the moving rod 83 moves, the range extender gear 86 rotates due to the influence of the tooth groove of the fixed sleeve 85. The connecting rod 32 is driven by the range extender gear 86, thereby causing the connecting rod 32 to move towards or away from the cross arm 31 until the suction cup 33 is located at a suitable position at the bottom 92 of the tank.

[0051] Then, move the tank bottom 92 to the suction cup 33, and push and pull the adjusting cylinder 41 through the electric push rod 43 so that the laser emitted by the laser rangefinder 42 is irradiated on the edge of the tank bottom 92 near the horizontal arm 31. At this time, the central axis of the tank bottom 92 is collinear with the horizontal arm 31, and the detection accuracy is high. Then move the support base 111 so that the tank bottom 92 is in contact with the tank body 91. Then turn on the laser emitter 54. Observe whether the laser emitted by the laser emitter 54 is irradiated on the target center of the target 55 through the visual sensor 72 or by manual observation. If the laser emitted by the laser emitter 54 is irradiated on the target center of the target 55, then the central axis of the tank body 91 and the tank bottom 92 are collinear.

[0052] Once the tank bottom 92 and the tank body 91 are correctly aligned, the outer welding machine 22 and the inner welding machine 21 are turned on to simultaneously perform welding operations on the inner and outer sides of the junction of the tank body 91 and the tank bottom 92 to improve welding efficiency. During this process, the laser Doppler vibrator 6 monitors the weld in real time to determine whether there are any defects in the weld.

[0053] Example 2

[0054] This application discloses a simultaneous internal and external welding process for PPH plastic storage tanks, referring to... Figure 1 , Figure 2 , Figure 3 and Figure 4 The simultaneous welding process for the inside and outside of PPH plastic storage tanks includes the following steps:

[0055] S1. Adjust the suction cup 33 and place the tank 91: Rotate the bevel gear 84 according to the size of the tank bottom 92 to adjust the distance between the suction cup 33 and the cross arm 31, and adjust the position of the support base 111 on the tank conveying slide rail 11 so that the distance between the suction cup 33 and the inner welding machine 21 is greater than the length of the tank 91 plus the thickness of the tank bottom 92. Then place the tank 91 on the power roller of the power support 14.

[0056] S2. Positioning and transporting the tank bottom 92: Move the tank bottom 92 to the suction cup 33, and push the adjusting cylinder 41 through the electric push rod 43 to synchronously change the tilt angle of all laser rangefinders 42 until the laser emitted by all laser rangefinders 42 illuminates the edge of the tank bottom 92 near the laser emitter 54. If the laser emitted by a laser rangefinder 42 exceeds the edge of the tank bottom 92, and the laser emitted by the remaining laser rangefinders 42 is still on the tank bottom 92, then the position of the tank bottom 92 will be biased towards the direction opposite to the laser emitter 54 that exceeds the edge. When the central axis of the tank bottom 92 is aligned with the horizontal arm 31, the suction cup 33 will hold the tank bottom 92, and then the support base 111 will move until the tank bottom 92 is against the tank body 91.

[0057] S3. Detect the relative position between tank body 91 and tank bottom 92: Adjust the height of electric lifting rod 52 by the size of tank body 91 so that the movable magnetic needle 53 is located at the central axis of tank body 91. When the movable magnetic needle 53 is deflected by the fixed magnetic rod 51, that is, when the laser emitted by laser emitter 54 on target 55 does not hit the target center, the central axis of tank bottom 92 is not collinear with the central axis of tank body 91. When the laser emitted by laser emitter 54 hits the target center of target 55, the central axis of tank bottom 92 is collinear with the central axis of tank 91.

[0058] S4. Welding: When the position between the tank body 91 and the tank bottom 92 is correct, turn on the inner welding machine 21, the outer welding machine 22 and the power support 14 to simultaneously perform internal and external welding between the tank body 91 and the tank bottom 92 until the tank body 91 rotates one full turn and the welding is completed.

[0059] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A PPH plastic storage tank internal and external synchronous welding equipment, comprising a tank conveying slide rail (11) fixed to the ground, an outer welding slide rail (12), and an inner welding support (13), wherein a power support (14) with multiple power rollers arranged on both sides is slidably mounted on the tank conveying slide rail (11), characterized in that: An inner welding machine (21) is fixedly connected to the inner welding bracket (13), an outer welding machine (22) is slidably connected to the outer welding slide rail (12), a support base (111) is slidably connected to the tank conveying slide rail (11), a hydraulic lifting frame (112) is fixedly connected to the support base (111), a horizontal arm (31) is horizontally rotatably connected to the hydraulic lifting frame (112), and the extension line of the horizontal arm (31) is between the two power rollers on the power support (14). The horizontal arm (31) is provided with multiple connecting rods (32) at equal distances. The ends of the connecting rods (32) are provided with suction cups (33) whose suction force is parallel to the central axis of the tank body (91). The horizontal arm (31) is provided with a primary detection component (4) for detecting the alignment of the central axis of the tank bottom (92) with the horizontal arm (31). The inner welding machine (21) is provided with a secondary detection mechanism for detecting the alignment of the central axis of the tank bottom (92) with the central axis of the tank body (91). The primary detection assembly (4) includes an adjusting cylinder (41) slidably sleeved on the cross arm (31), a plurality of laser rangefinders (42) hinged on the cross arm (31), an electric push rod (43) fixed on the cross arm (31), and a movable rod (44) hinged on the adjusting cylinder (41). The laser rangefinders (42) are evenly distributed around the cross arm (31). The laser rangefinders (42) are located at the end of the adjusting cylinder (41) away from the bottom of the tank (92). The movable rod (44) is hinged to the laser rangefinders (42). The laser rangefinders (42) illuminate the edge of the bottom of the tank (92) near the suction cup (33). The secondary detection mechanism includes a fixed magnetic rod (51) fixed to one end of the cross arm (31) near the inner welding machine (21), an electric lifting rod (52) fixed to the inner welding machine (21), a movable magnetic needle (53) movably mounted on the electric lifting rod (52), a laser emitter (54) fixed to one end of the movable magnetic needle (53) away from the fixed magnetic rod (51), and a transparent target (55) with a target ring printed on it fixed to the output end of the electric lifting rod (52). The magnetic poles of the fixed magnetic rod (51) and the movable magnetic needle (53) at their respective close ends are opposite in polarity. When the movable magnetic needle (53) is in a free state, the output end of the laser emitter (54) is directly facing the center of the target (55). The electric lifting rod (52) is also provided with a universal motion component (57) to facilitate the movement of the movable magnetic needle (53) according to the position of the fixed magnetic rod (51).

2. The PPH plastic storage tank internal and external synchronous welding equipment according to claim 1, characterized in that: The universal motion assembly (57) includes a concave frame (571) fixed to the output end of the electric lifting rod (52), an outer rotating ring (572) rotatably connected to the concave frame (571), and an inner rotating ring (573) rotatably connected inside the outer rotating ring (572). The movable magnetic needle (53) and the laser emitter (54) are fixed to the diameter of the inner rotating ring (573). The electric lifting rod (52) is equidistant from the two power rollers on the power support (14). When the movable magnetic needle (53) is in a free state, the rotation axis between the outer rotating ring (572) and the concave frame (571) is horizontal and perpendicular to the central axis of the tank (91). The rotation axis between the inner rotating ring (573) and the outer rotating ring (572) is vertical. The straight line formed by the movable magnetic needle (53) and the laser emitter (54) is parallel to the central axis of the tank (91).

3. The PPH plastic storage tank internal and external synchronous welding equipment according to claim 2, characterized in that: A reflector (71) is fixed above the target (55), and an angle-adjustable vision sensor (72) is provided on the inner welding machine (21). The vision sensor (72) monitors the target (55) through the reflection of the reflector (71). The vision sensor (72) is electrically connected to the power support (14), the outer welding machine (22), and the inner welding machine (21).

4. The PPH plastic storage tank internal and external synchronous welding equipment according to claim 3, characterized in that: A gravity block (531) is threadedly connected below the center of gravity of the system consisting of the movable magnetic needle (53) and the laser emitter (54).

5. The PPH plastic storage tank internal and external synchronous welding equipment according to claim 4, characterized in that: A fixed cover (81) is fixedly connected to the cross arm (31). A rotating disk (82) is rotatably connected to the cross arm (31) inside the fixed cover (81). The two ends of the rotating disk (82) are respectively provided with toothed grooves and threaded grooves. A movable rod (83) is slidably connected inside the fixed cover (81) and threadedly connected to the threaded groove of the rotating disk (82). The connecting rod (32) is disposed on the movable rod (83). A bevel gear (84) is rotatably connected to the fixed cover (81) and meshes with the toothed groove of the rotating disk (82).

6. The PPH plastic storage tank internal and external synchronous welding equipment according to claim 5, characterized in that: Fixed sleeves (85) corresponding to the connecting rods (32) are fixedly connected to the fixed cover (81). The connecting rods (32) are slidably connected to the fixed sleeves (85). The end of the moving rod (83) away from the rotating disk (82) is rotatably connected to the range extender gear (86). The inner wall of the fixed cover (81) near the range extender gear (86) and the inner wall of the connecting rod (32) near the range extender gear (86) are both provided with tooth grooves that mesh with the range extender gear (86).

7. The PPH plastic storage tank internal and external synchronous welding equipment according to claim 6, characterized in that: A laser Doppler vibrator (6) is fixedly attached to the side of the inner welding machine (21) that rotates away from the tank (91) and the side of the outer welding machine (22) that rotates away from the tank (91).

8. A synchronous welding process for the inside and outside of PPH plastic storage tanks, based on the synchronous welding equipment for the inside and outside of PPH plastic storage tanks according to claim 7, characterized in that, Includes the following steps: S1. Adjust the suction cup (33) and place the tank (91): Rotate the bevel gear (84) according to the size of the tank bottom (92) to adjust the distance between the suction cup (33) and the cross arm (31), and adjust the position of the support base (111) on the tank conveying slide rail (11) so that the distance between the suction cup (33) and the inner welding machine (21) is greater than the length of the tank (91) plus the thickness of the tank bottom (92). Then place the tank (91) on the power roller of the power support (14). S2. Positioning and transporting the bottom of the tank (92): Move the bottom of the tank (92) to the suction cup (33), and push the adjusting cylinder (41) through the electric push rod (43) to simultaneously change the tilt angle of all laser rangefinders (42) until the laser emitted by all laser rangefinders (42) illuminates the edge of the bottom of the tank (92) near the laser emitter (54). If the laser emitted by a laser rangefinder (42) exceeds the edge of the bottom of the tank (92) and the laser emitted by the remaining laser rangefinders (42) is still on the bottom of the tank (92), then the position of the bottom of the tank (92) is biased towards the direction opposite to the laser emitter (54) that exceeds the edge. When the central axis of the bottom of the tank (92) is aligned with the cross arm (31), the suction cup (33) sucks the bottom of the tank (92), and then the support base (111) moves to the bottom of the tank (92) and abuts against the tank body (91). S3. Detect the relative position between the tank body (91) and the tank bottom (92): Adjust the height of the electric lifting rod (52) by the size of the tank body (91) so that the movable magnetic needle (53) is located at the central axis of the tank body (91). When the movable magnetic needle (53) is deflected by the fixed magnetic rod (51), that is, when the laser emitted by the laser emitter (54) on the target (55) does not hit the target center, the central axis of the tank bottom (92) is not collinear with the central axis of the tank body (91). When the laser emitted by the laser emitter (54) hits the target center of the target (55), the central axis of the tank bottom (92) is collinear with the central axis of the tank body (91). S4. Welding: When the position between the tank body (91) and the tank bottom (92) is correct, turn on the inner welding machine (21), the outer welding machine (22) and the power support (14) to simultaneously perform internal and external welding between the tank body (91) and the tank bottom (92) until the tank body (91) rotates one full turn and the welding is completed.

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