Internal and external synchronous welding treatment equipment and welding process for PPH plastic storage tank

Abstract

The invention relates to the technical field of PPH storage tank welding, and particularly discloses PPH plastic storage tank inside and outside synchronous welding treatment equipment and a welding technology.The PPH plastic storage tank inside and outside synchronous welding treatment equipment comprises a tank conveying sliding rail, an outside welding sliding rail and an inside welding support which are fixedly connected to the ground, a power support with a plurality of power rotating rollers arranged on the two sides is arranged on the tank conveying sliding rail in a sliding mode, and an inside welding machine is fixedly connected to the inside welding support; an outer welding machine is slidably connected to the outer welding sliding rail, a supporting base is slidably connected to the can conveying sliding rail, a hydraulic lifting frame is fixedly connected to the supporting base, a cross arm is horizontally and rotatably connected to the hydraulic lifting frame, a plurality of connecting rods are arranged on the cross arm, and suction cups with suction force parallel to the center axis of the can body are arranged at the ends of the connecting rods. The cross arm is provided with a primary detection assembly used for detecting the alignment of the center axis of the tank bottom and the cross arm, and the internal welding machine is provided with a secondary detection mechanism used for detecting the alignment of the center axis of the tank bottom and the center axis of the tank body. The method has the effects of shortening the welding time and improving the welding precision.

Description

Technical Field

[0001] The present application relates to the technical field of PPH tank welding, and in particular to internal and external synchronous welding processing equipment and welding technology for PPH plastic tanks. Background Art

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

[0003] The production of PPH storage tanks generally includes: tank body extrusion winding production, external welding production, internal welding production, pipe mouth installation production and quality inspection. The external welding production is to place the tank bottom on a turntable first, then place the tank body on the tank bottom, and then use an extrusion welding machine to hot-melt the new PPH granular material at the weld between the tank body and the tank bottom, so that the tank bottom and the tank body are connected as one; the internal welding uses a long-arm extrusion welding machine to hot-melt the new PPH granular material at the junction of the inside of the tank and the tank bottom, so that the tank body and the tank bottom are integrated, further strengthening the structural stability of the storage tank and eliminating the risk of leakage.

[0004] With respect to the above-mentioned related technologies, the inventors believe that the following defects exist: when the tank body is welded to the tank bottom, the tank body and the tank bottom need to be first transported to the external welding station for rotation welding, and then the storage tank after the external welding is completed 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 clamp on the turntable is used to position the tank bottom so that the central axes of the tank body and the tank bottom are collinear, and the accuracy is low. Summary of the invention

[0005] In order to improve the problem of long time consumption and low precision in the welding process between the tank body and the tank bottom, the present application provides PPH plastic storage tank internal and external synchronous welding processing equipment and welding process.

[0006] The PPH plastic storage tank internal and external synchronous welding processing equipment provided in this application adopts the following technical solutions: PPH plastic storage tank internal and external synchronous welding processing equipment and welding process, including a tank conveying slide rail, an external welding slide rail, and an internal welding bracket fixed on the ground, the tank conveying slide rail is slidably provided with a power support with a plurality of power rollers arranged on both sides, characterized in that: an internal welding machine is fixedly connected to the internal welding bracket, an external welding machine is slidably connected to the external welding slide rail, a support base is slidably connected to the tank conveying slide rail, a hydraulic lifting frame is fixedly connected to the support base, a cross arm is horizontally rotatably connected to the hydraulic lifting frame, and the extension line of the cross arm is at an equal distance from the power rollers on both sides of the power support, a plurality of connecting rods are arranged on the cross arm, and a suction cup whose suction force is parallel to the central axis of the tank body is arranged on the end of the connecting rod, a primary detection component for detecting the alignment of the central axis of the tank bottom with the cross arm is arranged on the cross arm, and a secondary detection mechanism for detecting the alignment of the central axis of the tank bottom with the tank body is arranged on the internal welding machine; The primary detection component includes an adjustment cylinder slidably sleeved on the cross arm, a plurality of laser rangefinders hinged on the cross arm, an electric push rod fixedly connected to the cross arm, and a movable rod hinged on the adjustment cylinder. The laser rangefinders are evenly distributed around the cross arm. The laser rangefinder is located at one end of the adjustment cylinder away from the bottom of the tank. The movable rod is hinged to the laser rangefinder. The laser rangefinder irradiates the edge of the bottom of the tank close to the suction cup.

[0007] By adopting the above technical scheme, the support base is moved on the tank conveying slide rail so that the distance between the suction cup and the internal welding machine is greater than the length of the tank body plus the thickness of the tank bottom. The tank body is placed on the power support, and then the tank bottom is moved to the suction cup. The electric push rod pushes and pulls the adjustment cylinder so that the laser emitted by the laser rangefinder is irradiated on the edge of the tank bottom close to one end of the cross arm. At this time, the central axis of the tank bottom is collinear with the cross arm, and the detection accuracy is high. Then the support base is moved to make the tank bottom fit the tank body. Then, the secondary detection mechanism is used to detect 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 external welding machine and the internal welding machine are turned on to simultaneously weld the inner and outer sides of the junction of the tank body and the tank bottom, which greatly shortens the total time consumed for internal and external welding.

[0008] Optionally, the secondary detection mechanism includes a fixed magnetic rod fixedly connected to one end of the cross arm close to the internal welding machine, an electric lifting rod fixedly connected to the internal welding machine, a movable magnetic needle movably arranged on the electric lifting rod, a laser emitter fixedly connected to the end of the movable magnetic needle away from the fixed magnetic rod, and a transparent target with a target ring fixedly connected to the output end of the electric lifting rod. The magnetic poles of the fixed magnetic rod and the movable magnetic needle close to each other are opposite. When the movable magnetic needle is in a free state, the output end of the laser emitter faces the center of the target. The electric lifting rod is also provided with a universal motion component that facilitates the movable magnetic needle to move according to the position of the fixed magnetic rod.

[0009] By adopting the above technical solution, after the tank bottom and the tank body are fitted together, turn on the laser emitter, observe whether the movable magnetic needle moves through the universal motion assembly, and after the movable magnetic needle is stable, observe whether the laser emitted by the laser emitter is irradiated on the bull's eye of the target. If the laser emitted by the laser emitter is irradiated on the bull's eye of the target, the central axes of the tank body and the tank bottom are collinear with each other, otherwise the central axes of the tank body and the tank bottom are not aligned with each other, and then it is necessary to adjust the hydraulic lifting frame to adjust the height of the tank bottom until the laser emitted by the laser emitter is irradiated on the bull's eye of the target. At this time, the central axis of the tank bottom and the central axis of the tank body are aligned with each other, with high accuracy and without too much manual operation.

[0010] Optionally, the universal motion assembly includes a concave frame fixedly connected to the output end of the electric lifting rod, an outer swivel ring rotatably connected to the concave frame, and an inner swivel ring rotatably connected to the outer swivel ring, the movable magnetic needle and the laser emitter are fixedly connected to the diameter of the inner swivel ring, the electric lifting rod is at an equal distance 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 swivel ring and the concave frame is in a horizontal state and perpendicular to the center axis of the tank body, the rotation axis between the inner swivel ring and the outer swivel ring is in a vertical state, and the straight line connecting the movable magnetic needle and the laser emitter is parallel to the center axis of the tank body.

[0011] By adopting the above technical scheme, the magnetic spacer bottom of the fixed magnetic bar acts on the movable magnetic needle, and the movable magnetic needle tends to point to the end of the fixed magnetic bar close to the movable magnetic needle. When the movable magnetic needle tends to tilt in the vertical direction, the outer rotating ring rotates to make the end of the movable magnetic needle close to the fixed magnetic bar 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.

[0012] Optionally, a reflector is fixed above the target, and a visual sensor with an adjustable angle is provided on the internal welding machine. The visual sensor monitors the target through reflection from the reflector, and the visual sensor is electrically connected to the power support, the external welding machine and the internal welding machine respectively.

[0013] By adopting the above technical solution, during the welding operation, the visual sensor monitors the specific situation of the target in real time through reflection from the reflector. When the laser irradiated on the target deviates from the center of the target, the visual sensor sends a signal to stop the internal welding machine, the external welding machine and the power support to avoid the bottom of the tank from shifting on the tank body.

[0014] Optionally, a gravity block is threadedly connected below the center of gravity of the system consisting of the movable magnetic needle and the laser transmitter.

[0015] By adopting the above technical solution, the gravity block is turned to adjust the distance between the gravity block and the active magnetic needle. When the distance between the gravity block and the active magnetic needle is far, that is, the center of gravity of the system composed of the gravity block, the active magnetic needle and the laser transmitter is low, the active magnetic needle will shake with a smaller amplitude and lower frequency, and the active magnetic needle will return to a stationary state faster after calibration of the tank bottom, but the allowable error range will be larger. On the contrary, when the distance between the gravity block and the active magnetic needle is closer, the active magnetic needle will be more sensitive and the allowable error range will be smaller.

[0016] Optionally, a fixed cover is fixedly connected to the cross arm, and a rotating disk is rotatably connected to the cross arm in the fixed cover, and tooth grooves and thread grooves are respectively provided on both end surfaces of the rotating disk. A moving rod is slidably connected to the fixed cover and threadedly connected to the thread groove of the rotating disk, and the connecting rod is arranged on the moving rod. A bevel gear is rotatably connected to the fixed cover and meshed with the tooth groove of the rotating disk.

[0017] By adopting the above technical solution, before welding, the bevel gear is rotated to rotate the rotating disk, and the rotating rotating disk drives the moving rod to move along the radial direction of the rotating disk, thereby causing the connecting rod to move toward or away from the cross arm, so that the suction cups can contract or expand with each other, that is, when positioning tank bottoms of different sizes, the suction cups are adjusted so that the suction cups are located at a position on the tank bottom that is relatively far away 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.

[0018] Optionally, a fixed sleeve corresponding to the connecting rod is fixedly connected to the fixed cover, the connecting rod is slidably connected to the fixed sleeve, the end of the movable rod away from the rotating disk is rotatably connected to the range-extending gear, and the inner wall of the fixed cover close to the range-extending gear and the inner wall of the connecting rod close to the range-extending gear are both provided with tooth grooves meshing with the range-extending gear.

[0019] By adopting the above technical solution, when the moving rod moves, the range-extending gear is affected by the tooth groove of the fixed sleeve and rotates, and the connecting rod is driven by the range-extending gear, and the displacement distance of the connecting rod is equal to the displacement distance of the range-extending gear and the rotation distance of the range-extending gear, thereby further increasing the telescopic stroke of the connecting rod in the fixed sleeve, that is, increasing the contraction or expansion distance between the suction cups, and further adapting to tank bottoms of more sizes.

[0020] Optionally, a laser Doppler vibrometer is fixedly connected to a side of the inner welding machine that rotates away from the tank body and a side of the outer welding machine that rotates away from the tank body.

[0021] By adopting the above technical solution, when the internal welding machine and the external welding machine perform synchronous welding, the laser Doppler vibrometer monitors the weld in real time to determine in real time whether there are defects in the weld.

[0022] The synchronous welding process of the inside and outside of the PPH plastic storage tank includes the following steps: S1. Adjust the suction cup and place the tank body: Turn the bevel gear according to the size of the tank bottom to adjust the distance between the suction cup and the cross arm, adjust the position of the support base on the tank conveying slide rail, make the distance between the suction cup and the inner welding machine larger than the length of the tank body plus the thickness of the tank bottom, and then place the tank body on the power roller of the power support; S2. Positioning and conveying the tank bottom: Move the tank bottom to the suction cup, push the adjustment cylinder through the electric push rod to synchronously change the inclination angle of all laser rangefinders until the lasers emitted by all laser rangefinders irradiate the edge of the tank bottom close to one end of the laser emitter. If the laser emitted by a laser rangefinder exceeds the edge of the tank bottom and the lasers emitted by the remaining laser rangefinders are still on the tank bottom, the tank bottom position is biased in the direction opposite to the laser emitter that exceeds the edge. When the central axis of the tank bottom is facing the cross arm, the suction cup sucks the tank bottom, and then the support base moves to the tank bottom and abuts against the tank body; S3. Detect the relative position between the tank body and the tank bottom: adjust the height of the electric lifting rod according to the size of the tank body, so that the movable magnetic needle is located at the central axis of the tank body. When the movable magnetic needle is offset by the fixed magnetic rod, that is, the laser emitted by the laser transmitter on the target does not hit the center of the target, 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 transmitter hits the center of the target, the central axis of the tank bottom is collinear with the central axis of the tank body. S4. Welding: When the position between the tank body and the tank bottom is correct, turn on the internal welding machine, external welding machine and power support to simultaneously perform internal welding and external welding between the tank body and the tank bottom until the tank body rotates one circle and the welding is completed.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. After the primary detection components and the secondary detection mechanism are calibrated, the tank bottom is fitted with the tank body, and the external welding machine and the internal welding machine are turned on to simultaneously weld the inside and outside of the junction of the tank body and the tank bottom, which effectively shortens the total time of internal and external welding and improves welding efficiency; 2. The electric push rod pushes and pulls the adjustment cylinder so that the laser emitted by the laser rangefinder is irradiated on the edge of the tank bottom near one end of the cross arm. At this time, the central axis of the tank bottom is in line with the cross arm. If one of the lasers deviates from the tank bottom, the central axis of the tank bottom is not aligned with the cross arm. The detection process is simple and has high accuracy. 3. When the tank bottom and tank body are fitted together, after the movable magnetic needle is stable, turn on the laser transmitter. If the laser emitted by the laser transmitter shines on the bull's eye of the target, the movable magnetic needle is facing the fixed magnetic rod, indicating that the central axes of the tank body and the tank bottom are collinear with each other. On the contrary, if the laser deviates from the bull's eye, the central axes of the tank body and the tank bottom are not aligned with each other, further enhancing the accuracy before welding; 4. Adjust the distance between the gravity block and the movable magnetic needle by twisting the gravity block. That is, when the distance between the gravity block and the movable magnetic needle is far, the center of gravity of the system composed of the gravity block, the movable magnetic needle and the laser transmitter is lower. At this time, the swing amplitude of the movable magnetic needle is smaller and the frequency is lower, so that the tank bottom can be calibrated, that is, the fixed magnetic bar and the movable magnetic needle are realigned. The movable magnetic needle returns to rest faster, but the allowable error range of the gravity block at a lower position will be larger. On the contrary, when the distance between the gravity block and the movable magnetic needle is closer, the center of gravity of the system composed of the gravity block, the movable magnetic needle and the laser transmitter is higher, the movable magnetic needle is more sensitive, and the allowable error range is smaller, so as to adjust the relative error range between the tank bottom and the tank body according to the actual working conditions; 5. Before welding, rotate the bevel gear to rotate the rotating disk. The rotating rotating disk drives the moving rod to move along the radial direction of the rotating disk. When the moving rod moves, the range-extending gear rotates under the influence of the tooth groove of the fixed sleeve, and the connecting rod is driven by the range-extending gear, thereby moving the connecting rod toward or away from the cross arm until the suction cup is located at the appropriate position of the tank bottom, thereby improving the stability of the tank bottom positioning and rotation to adapt to tank bottoms of various sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 This is a partial structural schematic diagram used in this application to show the tank conveying slide 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-increasing gear; 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 vibrometer, reflector and visual sensor; Figure 4 yes Figure 3 Enlarged schematic diagram of part A.

[0025] Figure numerals: 11, tank slide rail; 111, support base; 112, hydraulic lifting frame; 12, external welding slide rail; 13, internal welding bracket; 14, power support; 21, internal welding machine; 22, external welding machine; 31, cross arm; 32, connecting rod; 33, suction cup; 4, primary detection component; 41, adjustment cylinder; 42, laser rangefinder; 43, electric push rod; 44, movable rod; 51, fixed magnetic rod; 52, electric lifting rod; 53, movable rod Moving magnetic needle; 531, gravity block; 54, laser transmitter; 55, target; 56, lifting plate; 57, universal motion assembly; 571, concave frame; 572, outer swivel; 573, inner swivel; 6, laser Doppler vibrometer; 71, reflector; 72, visual sensor; 81, fixed cover; 82, rotating disk; 83, moving rod; 84, bevel gear; 85, fixed sleeve; 86, range-extending gear; 91, tank body; 92, tank bottom. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-4 This application is described in further detail.

[0027] Embodiment 1

[0028] The present application embodiment discloses a PPH plastic storage tank internal and external synchronous welding processing equipment and welding process. Figure 1 and Figure 2The PPH plastic storage tank internal and external synchronous welding processing equipment includes the PPH plastic storage tank internal and external synchronous welding processing equipment and welding process, including a tank conveying slide rail 11 fixed to the ground, an external welding slide rail 12, and an internal welding bracket 13. The tank conveying slide rail 11 is slidably provided with a power support 14 with a plurality of power rollers arranged on both sides. The internal welding bracket 13 is fixedly connected with an internal welding machine 21. The external welding slide rail 12 is slidably connected with an external welding machine 22 (the external welding machine 22 and the power support 14 are both moved by rollers, not shown in the figure). The tank conveying slide rail 11 is slidably connected with a support base 111. The support base A hydraulic lifting frame 112 is fixedly connected to 111, and a horizontal cross arm 31 is rotatably connected to the hydraulic lifting frame 112. The extension line of the cross arm 31 is equidistant from the power rollers on both sides of the power support 14. A plurality of connecting rods 32 are arranged on the cross arm 31, and suction cups 33 with suction force parallel to the central axis of the tank body 91 are arranged at the ends of the connecting rods 32. A primary detection component 4 for detecting whether the central axis of the tank bottom 92 is aligned with the cross arm 31 is arranged on the cross arm 31, and a secondary detection mechanism for detecting whether the tank bottom 92 is aligned with the central axis of the tank body 91 is arranged on the internal welding machine 21. The primary detection component 4 includes an adjustment cylinder 41 slidably mounted on the cross arm 31, a plurality of laser rangefinders 42 hinged on the cross arm 31, an electric push rod 43 fixedly connected to the cross arm 31, and a movable rod 44 hinged on the adjustment cylinder 41. In the present application, there are four laser rangefinders 42, and the four laser rangefinders 42 are evenly distributed around the cross arm 31. The laser rangefinder 42 is located at one end of the adjustment cylinder 41 away from the tank bottom 92. The movable rod 44 is hinged to the laser rangefinder 42. The laser rangefinder 42 irradiates the edge of the tank bottom 92 close to the suction cup 33.

[0029] The support base 111 is moved on the tank conveying slide rail 11 so that the distance between the suction cup 33 and the internal 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 electric push rod 43 pushes and pulls the adjustment cylinder 41 so that the laser emitted by the laser rangefinder 42 is irradiated on the edge of the tank bottom 92 near one end of 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 fitted with the tank body 91. Then, the secondary detection mechanism is used to detect 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 aligned correctly, the external welding machine 22 and the internal welding machine 21 are turned on, and the inner and outer sides of the junction of the tank body 91 and the tank bottom 92 are welded simultaneously, which greatly shortens the total time consumption of internal and external welding. At the same time, a laser Doppler vibrator 6 is fixedly connected to the side of the internal welding machine 21 that rotates away from the tank body 91 and the side of the external welding machine 22 that rotates away from the tank body 91. When the internal welding machine 21 and the external welding machine 22 perform synchronous welding, the laser Doppler vibrator 6 monitors the weld in real time to determine whether there are defects in the weld in real time.

[0030] 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 close to 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, an active magnetic needle 53 movably arranged on the lifting plate 56, a laser emitter 54 fixed to the end of the active 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 visual sensor 72 is hinged to the inner welding machine 21 through an adjustable angle hinge, the visual sensor 72 monitors the target 55 through the reflection of the reflector 71, and the visual 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 bar 51 and the movable magnetic needle 53 near their ends are opposite to each other. When the movable magnetic needle 53 is in a free state, the output end of the laser transmitter 54 is facing the bull's eye of the target 55. The electric lifting rod 52 is also provided with a universal motion component 57 for facilitating the movable magnetic needle 53 to move according to the position of the fixed magnetic bar 51.

[0031] After the tank bottom 92 and the tank body 91 are fitted together, the height of the electric lifting rod 52 is adjusted based on the size of the tank body 91 known in advance, so that the movable magnetic needle 53 is located at the height of the central axis of the tank body 91, and then the laser emitter 54 is turned on, and the laser emitted by the laser emitter 54 is observed by the visual sensor 72 or manually to see whether it is irradiated on the bull's eye of the target 55. If the laser emitted by the laser emitter 54 is irradiated on the bull's eye of the target 55, the central axes of the tank body 91 and the tank bottom 92 are collinear with each other, otherwise, the central axes of the tank body 91 and the tank bottom 92 are not aligned with each other, and then the hydraulic lifting frame needs to be adjusted. 112 is used to adjust the height of the tank bottom 92 until the laser emitted by the laser emitter 54 irradiates the bull's eye 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 accuracy and without too much manual operation. During the welding operation, the visual sensor 72 also monitors the specific situation of the target 55 in real time through the reflection of the reflector 71. When the laser irradiated on the target 55 deviates from the bull's eye, the visual sensor 72 sends a signal to stop the internal welding machine 21, the external welding machine 22 and the power support 14 to avoid the tank bottom 92 from deviating on the tank body 91.

[0032] Reference Figure 1 and Figure 4The 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 to 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 distance between the electric lifting rod 52 and the power rollers on both sides of the power support 14 is equal. 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 in a horizontal state and perpendicular to the central axis of the tank body 91, the rotation axis between the inner rotating ring 573 and the outer rotating ring 572 is in a vertical state, 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 body 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.

[0033] The magnetic isolation tank bottom 92 of the fixed magnetic rod 51 acts on the movable magnetic needle 53, and the movable magnetic needle 53 tends to point to the end of the fixed magnetic rod 51 close to the movable magnetic needle 53. When the movable magnetic needle 53 tends to tilt in the vertical direction, the outer rotating ring 572 rotates to make the end of the movable magnetic needle 53 close to the fixed magnetic rod 51 tilt accordingly; when the movable magnetic needle 53 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 53 and the laser emitter 54 move smoothly with good mobility, thereby effectively improving the detection accuracy; and by twisting the gravity block 531 to adjust the distance between the gravity block 531 and the movable magnetic needle 53, that is, when the distance between the gravity block 531 and the movable magnetic needle 53 When the distance between the gravity block 531 and the active magnetic needle 53 is far, the center of gravity of the system composed of the gravity block 531, the active magnetic needle 53 and the laser emitter 54 is lower. At this time, the active magnetic needle 53 shakes with a smaller amplitude and a lower frequency, so that after the tank bottom 92 is calibrated, that is, after the fixed magnetic bar 51 and the active magnetic needle 53 are realigned, the active magnetic needle 53 returns to a stationary state faster, but the allowable error range of the lowered gravity block 53 is larger. On the contrary, when the distance between the gravity block 531 and the active magnetic needle 53 is closer, the center of gravity of the system composed of the gravity block 531, the active magnetic needle 53 and the laser emitter 54 is higher, the active magnetic needle 53 is more sensitive, and the allowable error range is smaller, so that the relative error range between the tank bottom 92 and the tank body 91 is adjusted according to the actual working conditions.

[0034] Reference Figure 2A fixed cover 81 is fixedly connected to the cross arm 31, and a rotating disk 82 is rotatably connected to the cross arm 31 in the fixed cover 81. Tooth grooves and thread grooves are respectively provided at both end surfaces of the rotating disk 82. A moving rod 83 threadably connected to the thread groove of the rotating disk 82 is slidably connected in the fixed cover 81. The connecting rod 32 is arranged on the moving rod 83. A bevel gear 84 meshing with the tooth groove of the rotating disk 82 is rotatably connected to the fixed cover 81. 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. An end of the moving rod 83 away from the rotating disk 82 is rotatably connected to a range-increasing gear 86. The inner wall of the fixed cover 81 close to the range-increasing gear 86 and the inner wall of the connecting rod 32 close to the range-increasing gear 86 are both provided with tooth grooves meshing with the range-increasing gear 86.

[0035] Before welding, the bevel gear 84 is rotated to rotate the rotating disk 82, and the rotating rotating disk 82 drives the moving rod 83 to move along the radial direction of the rotating disk 82. When the moving rod 83 moves, the range-increasing gear 86 is affected by the tooth groove of the fixed sleeve 85 and rotates, and the connecting rod 32 is driven by the range-increasing gear 86, so that the connecting rod 32 moves toward or away from the cross arm 31, so that the suction cups 33 can contract or expand with each other, that is, when positioning the tank bottom 92 of different sizes, the suction cup 33 is adjusted so that the suction cup 33 is located at a position of the tank bottom 92 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.

[0036] The implementation principle of the PPH plastic storage tank internal and external synchronous welding processing equipment and welding process of the embodiment of the present application is as follows: before welding, the bevel gear 84 is rotated to rotate the rotating disk 82 accordingly, and the rotating rotating disk 82 drives the moving rod 83 to move along the radial direction of the rotating disk 82. When the moving rod 83 moves, the range-increasing gear 86 is affected by the tooth groove of the fixed sleeve 85 and rotates, and the connecting rod 32 is driven by the range-increasing gear 86, so that the connecting rod 32 moves toward or away from the cross arm 31 until the suction cup 33 is located at a suitable position on the tank bottom 92; Then, the tank bottom 92 is moved to the suction cup 33, and 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 close to one end of 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 to make the tank bottom 92 fit with the tank body 91, and then the laser emitter 54 is turned on. The laser emitted by the laser emitter 54 is irradiated on the bull's eye of the target 55 through the visual sensor 72 or manually observed. If the laser emitted by the laser emitter 54 is irradiated on the bull's eye of the target 55, the central axes of the tank body 91 and the tank bottom 92 are collinear with each other. When the tank bottom 92 and the tank body 91 are aligned correctly, the external welding machine 22 and the internal welding machine 21 are turned on to simultaneously weld 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 defects in the weld in real time.

[0037] Embodiment 2

[0038] The present application embodiment discloses a synchronous welding process for the inside and outside of a PPH plastic storage tank, referring to Figure 1 , Figure 2 , Figure 3 and Figure 4 The synchronous welding process of the inside and outside of the PPH plastic storage tank includes the following steps: S1. Adjust the suction cup 33 and place the tank body 91: Turn 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, adjust the position of the support base 111 on the tank conveying slide rail 11, make the distance between the suction cup 33 and the inner welding machine 21 larger than the length of the tank body 91 plus the thickness of the tank bottom 92, and then place the tank body 91 on the power roller of the power support 14; S2. Positioning and conveying the tank bottom 92: Move the tank bottom 92 to the suction cup 33, and push the adjustment cylinder 41 through the electric push rod 43 to synchronously change the inclination angles of all laser rangefinders 42, until the lasers emitted by all laser rangefinders 42 are irradiated on the edge of the tank bottom 92 close to the laser emitter 54. If the lasers emitted by some laser rangefinders 42 exceed the edge of the tank bottom 92, and the lasers emitted by the remaining laser rangefinders 42 are still on the tank bottom 92, the position of the tank bottom 92 is biased to the direction opposite to the laser emitter 54 that exceeds the edge. When the central axis of the tank bottom 92 is facing the cross arm 31, the suction cup 33 sucks the tank bottom 92, and then the support base 111 moves until the tank bottom 92 is against the tank body 91; S3, detecting the relative position between the tank body 91 and the tank bottom 92: adjusting the height of the electric lifting rod 52 according to 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 affected by the fixed magnetic rod 51 and deviates, that is, when the laser emitted by the laser emitter 54 on the target 55 does not hit the bull's eye, 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 bull's eye 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, the internal welding machine 21, the external welding machine 22 and the power support 14 are turned on to simultaneously perform internal welding and external welding between the tank body 91 and the tank bottom 92 until the tank body 91 rotates one circle and the welding is completed.

[0039] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A PPH plastic storage tank internal and external synchronous welding processing device, comprising a tank conveying slide rail (11) fixed to the ground, an external welding slide rail (12), and an internal welding bracket (13), wherein a power support (14) having a plurality of power rollers arranged on both sides is slidably arranged on the tank conveying slide rail (11), and characterized in that: An internal welding machine (21) is fixedly connected to the internal welding bracket (13), an external welding machine (22) is slidably connected to the external 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 an extension line of the horizontal arm (31) is 1 / 400 mm from the power rollers on both sides of the power support (14). The cross arm (31) is provided with a plurality of connecting rods (32), 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 cross arm (31) is provided with a primary detection component (4) for detecting whether the central axis of the tank bottom (92) is aligned with the cross arm (31), and the internal welding machine (21) is provided with a secondary detection mechanism for detecting whether the tank bottom (92) is aligned with the central axis of the tank body (91); The primary detection assembly (4) comprises an adjustment 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) fixedly connected to the cross arm (31), and a movable rod (44) hinged on the adjustment cylinder (41), the laser rangefinders (42) being evenly distributed around the cross arm (31), the laser rangefinders (42) being located at one end of the adjustment cylinder (41) away from the tank bottom (92), the movable rod (44) being hinged to the laser rangefinder (42), and the laser rangefinder (42) irradiating an edge of the tank bottom (92) close to the suction cup (33).

2. The PPH plastic storage tank internal and external synchronous welding processing equipment according to claim 1 is characterized in that: The secondary detection mechanism comprises a fixed magnetic rod (51) fixedly connected to one end of the cross arm (31) close to the internal welding machine (21), an electric lifting rod (52) fixedly connected to the internal welding machine (21), a movable magnetic needle (53) movably arranged on the electric lifting rod (52), a laser emitter (54) fixedly connected to one end of the movable magnetic needle (53) away from the fixed magnetic rod (51), and a transparent target (55) printed with a target ring fixedly connected 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) close to each other are opposite in polarity. When the movable magnetic needle (53) is in a free state, the output end of the laser emitter (54) faces the bull's eye of the target (55). The electric lifting rod (52) is also provided with a universal motion component (57) for facilitating the movable magnetic needle (53) to move according to the position of the fixed magnetic rod (51).

3. The PPH plastic storage tank internal and external synchronous welding processing equipment according to claim 2 is characterized in that: The universal motion assembly (57) comprises a concave frame (571) fixedly connected 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 fixedly connected to the diameter of the inner rotating ring (573); the distance between the electric lifting rod (52) and the power rollers on both sides of the power support (14) is equal; 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 in a horizontal state and perpendicular to the central axis of the tank body (91); the rotation axis between the inner rotating ring (573) and the outer rotating ring (572) is in a vertical state; 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 body (91).

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

5. The PPH plastic storage tank internal and external synchronous welding processing equipment according to claim 2 is 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 transmitter (54).

6. The PPH plastic storage tank internal and external synchronous welding processing equipment according to claim 1 is characterized by: A fixed cover (81) is fixedly connected to the cross arm (31), a rotating disk (82) is rotatably connected to the cross arm (31) in the fixed cover (81), tooth grooves and thread grooves are respectively formed on both end surfaces of the rotating disk (82), a moving rod (83) is slidably connected to the fixed cover (81) and is threadedly connected to the thread groove of the rotating disk (82), the connecting rod (32) is arranged on the moving rod (83), and a bevel gear (84) is rotatably connected to the fixed cover (81) and is meshed with the tooth groove of the rotating disk (82).

7. The PPH plastic storage tank internal and external synchronous welding processing equipment according to claim 6 is characterized by: 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); one end of the movable rod (83) away from the rotating disk (82) is rotatably connected to a range-increasing gear (86); and an inner wall of the fixed cover (81) close to the range-increasing gear (86) and an inner wall of the connecting rod (32) close to the range-increasing gear (86) are both provided with tooth grooves meshing with the range-increasing gear (86).

8. The PPH plastic storage tank internal and external synchronous welding processing equipment according to claim 1 is characterized by: A laser Doppler vibrator (6) is fixedly connected to the side of the inner welder (21) that rotates away from the tank body (91) and the side of the outer welder (22) that rotates away from the tank body (91).

9. PPH plastic storage tank internal and external synchronous welding process, based on the PPH plastic storage tank internal and external synchronous welding processing equipment according to any one of claims 1 to 8, characterized in that: The steps include: S1, adjusting the suction cup (33) and placing the tank body (91): rotating 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), adjusting 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 internal welding machine (21) is greater than the length of the tank body (91) plus the thickness of the tank bottom (92), and then placing the tank body (91) on the power roller of the power support (14); S2, positioning and conveying the tank bottom (92): the tank bottom (92) is moved to the suction cup (33), and the adjustment cylinder (41) is pushed by the electric push rod (43) to synchronously change the tilt angles of all the laser rangefinders (42) until the lasers emitted by all the laser rangefinders (42) are irradiated on the edge of the tank bottom (92) close to the laser emitter (54). If the lasers emitted by the laser rangefinders (42) exceed the edge of the tank bottom (92) and the lasers emitted by the remaining laser rangefinders (42) are still on the tank bottom (92), the position of the tank bottom (92) is biased in the direction opposite to the laser emitter (54) that exceeds the edge. When the central axis of the tank bottom (92) is directly opposite to the cross arm (31), the suction cup (33) sucks the tank bottom (92), and then the support base (111) moves to the tank bottom (92) and abuts against the tank body (91); S3, detecting the relative position between the tank body (91) and the tank bottom (92): adjusting the height of the electric lifting rod (52) according to 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, the laser emitted by the laser emitter (54) on the target (55) does not hit the bull's eye, 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 bull's eye 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, the internal welding machine (21), the external welding machine (22) and the power support (14) are turned on to simultaneously perform internal welding and external welding between the tank body (91) and the tank bottom (92) until the tank body (91) rotates one circle and the welding is completed.

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