A rotatable automatic welding device for spherical tank top plate and application method thereof

Abstract

The application discloses a rotatable automatic welding device for the extreme top plate of a spherical tank, which is used for welding the manhole of the spherical tank and comprises a longitudinal lifting mechanism, a transverse displacement mechanism and a welding mechanism; the bottom of the longitudinal lifting mechanism is arranged in the manhole of the spherical tank through a rotating mechanism; the top of the longitudinal lifting mechanism is connected with the welding mechanism through the transverse displacement mechanism, which is used for adjusting the welding height of the welding mechanism; the transverse displacement mechanism is connected with the welding mechanism in a sliding mode, which is used for adjusting the welding position of the welding mechanism to adapt to manholes with different diameters; the welding mechanism is arranged on the transverse displacement mechanism in a sliding mode to realize transverse movement; and the welding mechanism is connected with the longitudinal lifting mechanism through the transverse displacement mechanism to realize longitudinal movement. The application solves the problem that the welding angle changes constantly in the welding process of the curved section of the manhole. The distance between the welding head at the bottom of the clamp and the welding seam can be finely adjusted. The manhole with different diameters and the welding requirement can also be adjusted.

Description

Technical Field

[0001] This invention relates to the technical field of welding manholes in spherical tanks, and more particularly to an automatic welding device for rotatable top plates of spherical tanks and its application method. Background Technology

[0002] Manholes on spherical tanks are openings for personnel to enter and exit the equipment for installation, maintenance, and safety inspections. They mainly consist of a short cylindrical section (or short pipe), a flange, and a manhole cover with a handle.

[0003] Because spherical tanks are spherical and manholes vary in size and location, when a manhole is located off-center, the cut will produce both planar and curved cuts. The welding angles for these two types of cuts differ. Traditionally, regardless of manhole size, welding is typically done manually, often requiring multiple layers and passes for a single weld. This demands extremely high welding skills and work ethic from the welders. Furthermore, manual welding cannot achieve precision and aesthetics, increases the labor costs of hiring skilled welders, and extends welding time, while also failing to meet the demands of modern automated production processes. Summary of the Invention

[0004] The purpose of this invention is to provide a rotatable automatic welding device for the top plate of a spherical tank that can automate the welding of manholes and maintain a consistent distance between the welding head and the weld seam during the welding process for manholes at different curved surface positions on the spherical tank.

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

[0006] An automatic rotatable welding device for the top plate of a spherical tank is disclosed for welding manholes of the tank. The device includes a longitudinal lifting mechanism, a lateral displacement mechanism, and a welding mechanism. The bottom of the longitudinal lifting mechanism is mounted inside the manhole of the tank via a rotating mechanism, and the top of the longitudinal lifting mechanism is connected to the welding mechanism via the lateral displacement mechanism. This mechanism is used to adjust the welding height of the welding mechanism. The lateral displacement mechanism is slidably connected to the welding mechanism to adjust the welding position of the welding mechanism to accommodate manholes of different diameters. The welding mechanism is slidably mounted on the lateral displacement mechanism to achieve lateral movement, and the welding mechanism is connected to the longitudinal lifting mechanism via the lateral displacement mechanism to achieve longitudinal movement.

[0007] Preferably, one end of the lateral displacement mechanism is connected to the longitudinal lifting mechanism via an installation mechanism; the longitudinal lifting mechanism includes a telescopic rod and a drive mechanism; the drive mechanism is connected to the telescopic rod via an output shaft, and the telescopic rod is controlled by the output shaft to achieve longitudinal lifting; the lateral displacement mechanism includes a lead screw cover, a threaded lead screw, a lead screw motor, and a nut; the output end of the lead screw motor is connected to the threaded lead screw, the threaded lead screw is fitted with a lead screw cover, and one end of the lead screw cover is connected to the telescopic rod of the longitudinal lifting mechanism via an installation mechanism to achieve lifting; the nut is threaded onto the external thread of the threaded lead screw via an internal thread, the bottom of the nut is connected to the welding mechanism, the threaded lead screw is driven to rotate by the lead screw motor, and the nut slides on the threaded lead screw via its thread, thereby driving the welding mechanism connected to the nut to achieve lateral displacement; the installation mechanism includes a lead screw mounting block; the threaded lead screw of the lateral displacement mechanism is connected to the telescopic rod of the longitudinal lifting mechanism via the lead screw mounting block.

[0008] Preferably, the drive mechanism is a hydraulic drive mechanism, a pneumatic drive mechanism, or a worm gear drive mechanism.

[0009] Preferably, the worm gear drive includes a worm gear, a worm, and a worm drive motor; the worm drive motor is connected to the worm via a drive shaft, the worm is meshed with the worm gear, and the output end of the worm gear is connected to a telescopic rod.

[0010] Preferably, the welding mechanism is a submerged arc welding mechanism, which includes a welding head adjustment mechanism, a flux tube, a welding wire, an arc tube, a clamp, a welding head, and a connecting bracket. The bottom end of the clamp is provided with a welding head, and the top end of the clamp is provided with an arc tube and a welding wire. The welding wire is fed by a wire feeding mechanism, and the arc tube outputs an arc through a high-temperature current. The clamp is connected to the flux tube through the connecting bracket, and the outlet of the flux tube is located in front of the welding head in the forward direction for flux discharge.

[0011] Preferably, the fixture is equipped with a distance sensor, which is connected to the control system via a signal. The control system controls the welding head adjustment mechanism to raise and lower the fixture according to a preset distance parameter, thereby maintaining a preset distance between the welding head connected to the end of the fixture and the weld.

[0012] Preferably, the rotating mechanism includes a mounting base, a turntable, and a rotating drive mechanism; the mounting base is provided with a turntable, the turntable is concentrically arranged with the mounting base, and the turntable drives the longitudinal lifting mechanism to achieve the rotation function through the rotating drive mechanism.

[0013] Preferably, it further includes an auxiliary limiting mechanism, which includes an outer cover, limiting posts, connecting ears, and an auxiliary plate; the outer cover is fitted over the drive mechanism of the longitudinal lifting mechanism, the auxiliary plate is mounted on the outer cover, and the output end of the drive mechanism is connected to the telescopic rod of the longitudinal lifting mechanism on the auxiliary plate; vertical limiting posts are respectively provided at both ends of the auxiliary plate; two sets of connecting ears are respectively provided on both sides of the lead screw mounting block, and the limiting posts pass through the connecting ears to provide auxiliary sliding and limiting functions for the lead screw mounting block when it rises and falls with the telescopic rod.

[0014] The present invention also provides an application method for a rotatable automatic welding device for the top plate of a spherical tank, comprising the following steps:

[0015] Step S0: Preparation: Determine the distance between the distance sensor on the preset fixture within the control system and the weld seam around the manhole on the spherical tank;

[0016] Step S1: Installation: Fix the automatic welding device inside the platform of the manhole of the spherical tank via the mounting base of the rotating mechanism. The longitudinal lifting mechanism of the automatic welding device achieves the rotation function through the turntable on the mounting base.

[0017] Step S2: Adjustment:

[0018] Step S21: Adjust the longitudinal height of the welding mechanism:

[0019] Based on the position of the manhole in the spherical tank, the height of the telescopic rod is adjusted by the drive mechanism of the longitudinal lifting mechanism, thereby adjusting the height of the welding mechanism on the lateral displacement mechanism connected to the telescopic rod.

[0020] Step S22: Adjust the lateral distance of the welding mechanism:

[0021] Based on the diameter of the manhole of the spherical tank, the screw motor of the lateral displacement mechanism drives the threaded screw to rotate, thereby causing the nut to slide laterally on the threaded screw along with the welding mechanism, thus adjusting the distance between the welding mechanism and the longitudinal lifting mechanism.

[0022] Step S3: Welding: The welding wire of the welding mechanism is fed through the wire feeding mechanism, and the arc tube of the welding mechanism outputs an arc through a high-temperature current; the flux is discharged through the flux tube of the welding mechanism.

[0023] Flux tubes are arranged side by side at the front of the welding head in the direction of advancement. First, the flux is dropped onto the weld. Then, the welding head feeds the welding wire through the clamp while outputting an electric arc through the arc tube. The welding is achieved in the circumferential direction of the manhole in conjunction with the turntable of the rotating mechanism.

[0024] When the distance sensor on the welding head adjustment mechanism of the welding mechanism detects that the distance between the clamp and the spherical tank is greater than the preset distance, it transmits a signal to the control system. The control system controls the welding head adjustment mechanism to descend, thereby shortening the weld seam distance between the distance sensor on the clamp and the manhole circumference on the spherical tank.

[0025] When the distance sensor on the welding head adjustment mechanism of the welding mechanism detects that the distance between the clamp and the spherical tank is less than the preset distance, it transmits a signal to the control system. The control system controls the welding head adjustment mechanism to rise, thereby increasing the distance between the distance sensor on the clamp and the weld seam around the manhole on the spherical tank.

[0026] The distance between the distance sensor on the fixture and the weld seam around the manhole on the spherical tank is always kept at a constant distance.

[0027] Step S4: The control system in step S3 continuously controls the welding head adjustment mechanism to drive the clamp to rise or fall, and works in conjunction with the rotation mechanism to realize the welding process of the circular curved surface weld on the manhole of the spherical tank.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] 1. The present invention can adjust the height of the welding mechanism on the transverse displacement mechanism connected to the longitudinal lifting mechanism through the longitudinal lifting mechanism, thereby aligning the welding mechanism with the weld position required for welding the manhole on the spherical tank.

[0030] 2. The present invention connects a sliding welding mechanism to a horizontal lifting mechanism, which can adjust the position of the welding mechanism according to the diameter of different manholes, thereby adapting to the welding needs of more manhole sizes.

[0031] 3. By setting a distance sensor on the welding mechanism, the present invention can control the welding head adjustment mechanism on the welding mechanism to adjust the clamp of the welding mechanism by raising and lowering it according to the distance data preset in the control system, thereby solving the problem of the welding angle constantly changing during the welding of the spatial curved surface section of the manhole.

[0032] 4. The present invention can fix the fixture of the welding mechanism through the welding head adjustment mechanism, and can also be set as a fine-tuning structure as needed to achieve fine-tuning of the fixture position through the slide rail, thereby achieving fine-tuning of the distance between the welding head at the bottom of the fixture and the weld.

[0033] 5. The present invention uses an auxiliary limiting mechanism to provide auxiliary sliding and limiting functions for the lead screw mounting block when it rises and falls with the telescopic rod. Attached Figure Description

[0034] Figure 1 This is a three-dimensional structural diagram of an automatic welding device for a rotatable top plate of a spherical tank, as proposed in this embodiment. Figure 1;

[0035] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0036] Figure 3 This is a front view structural schematic diagram of a rotatable automatic welding device for the top plate of a spherical tank proposed in this embodiment;

[0037] Figure 4 This is a three-dimensional structural diagram of an automatic welding device for a rotatable top plate of a spherical tank, as proposed in this embodiment. Figure 2 ;

[0038] Figure 5 This is a schematic diagram of the worm gear drive mechanism in an automatic welding device for the rotatable top plate of a spherical tank, as proposed in this embodiment.

[0039] Numbering on the map:

[0040] 100. Automatic welding device; 110. Mounting base; 120. Turntable; 130. Auxiliary limiting mechanism; 131. Outer cover; 132. Limiting post; 133. Connecting ear; 134. Auxiliary plate; 140. Longitudinal lifting mechanism; 141. Hydraulic rod; 142. Worm gear; 143. Worm gear drive motor; 144. Worm wheel; 150. Mounting mechanism; 151. Screw mounting block; 160. Lateral displacement mechanism; 161. Screw cover; 162. Threaded screw; 163. Screw motor; 170. Welding mechanism; 171. Welding head adjustment mechanism; 1711. Connecting rod; 1712. Adapter; 1713. Adapter plate; 1714. Clamping hoop; 172. Flux tube; 173. Welding wire; 174. Arc tube; 175. Fixture; 176. Welding head; 177. Connecting bracket. Detailed Implementation

[0041] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0042] Figure 1 This is a three-dimensional structural diagram of an automatic welding device for a rotatable top plate of a spherical tank, as proposed in this embodiment. Figure 1 .

[0043] Figure 2 for Figure 1 A magnified view of a portion of the image.

[0044] Figure 3 This is a front view structural schematic diagram of a rotatable automatic welding device for the top plate of a spherical tank proposed in this embodiment.

[0045] Figure 4 This is a three-dimensional structural diagram of an automatic welding device for a rotatable top plate of a spherical tank, as proposed in this embodiment. Figure 2 .

[0046] like Figures 1 to 4 As shown, this invention provides a rotatable automatic welding device for the top plate of a spherical tank. The rotatable automatic welding device 100 for the top plate of a spherical tank is used for welding the manhole of the spherical tank and includes a longitudinal lifting mechanism 140, a transverse displacement mechanism 160 and a welding mechanism 170.

[0047] The bottom of the longitudinal lifting mechanism 140 is installed inside the manhole of the spherical tank in a concentric rotatable manner via a rotating mechanism. The top of the longitudinal lifting mechanism 140 is connected to the welding mechanism via a lateral displacement mechanism 160. The height of the welding mechanism 170 on the lateral displacement mechanism 160 connected to the longitudinal lifting mechanism 140 can be adjusted to align the welding mechanism 170 with the weld position required for welding the manhole on the spherical tank.

[0048] The longitudinal lifting mechanism 140 includes a telescopic rod 141 and a drive mechanism; the drive mechanism is connected to the telescopic rod 141 through an output shaft, and controls the telescopic rod 141 to achieve longitudinal lifting through the output shaft.

[0049] The drive mechanism in the longitudinal lifting mechanism 140 is a hydraulic drive mechanism, a pneumatic drive mechanism, or a worm gear drive mechanism. In this embodiment, a worm gear mechanism is used.

[0050] Figure 5 This is a schematic diagram of the worm gear mechanism in an automatic welding device for a rotatable top plate of a spherical tank, as proposed in this embodiment.

[0051] like Figure 5 As shown, the worm gear drive includes a worm gear 144, a worm 142, and a worm drive motor 143; the worm drive motor 143 is connected to the worm 142 via a drive shaft, the worm 142 is meshed with the worm gear 144, and the output end of the worm gear 144 is connected to a telescopic rod 141.

[0052] The lateral displacement mechanism 160 is connected to the welding mechanism in a sliding manner to adjust the welding position of the welding mechanism 170 to accommodate manholes of different diameters.

[0053] One end of the lateral displacement mechanism 160 is connected to the longitudinal lifting mechanism 140 via the mounting mechanism 150. The lateral displacement mechanism 160 includes a lead screw cover 161, a threaded lead screw 162, a lead screw motor 163, and a nut. The output end of the lead screw motor 163 is connected to the threaded lead screw 162, and the lead screw cover 161 is fitted over the threaded lead screw 162. One end of the lead screw cover 161 is connected to the telescopic rod 141 of the longitudinal lifting mechanism 140 via the mounting mechanism to achieve the lifting function. The nut is threaded onto the external thread of the threaded lead screw 162 via its internal thread. The bottom of the nut is connected to the welding mechanism 170. The lead screw motor 163 drives the threaded lead screw 162 to rotate, and the nut slides on the threaded lead screw 162 via its thread, thereby driving the welding mechanism 170 connected to the nut to achieve lateral displacement.

[0054] The mounting mechanism 150 includes a lead screw mounting block 151; the threaded lead screw 162 of the lateral displacement mechanism 160 is connected to the telescopic rod 141 of the longitudinal lifting mechanism 140 via the lead screw mounting block 151. The lead screw mounting block 151 is a hexagonal rectangular block. A lead screw motor 163 is mounted on one side of the rectangular block, and the drive shaft of the lead screw motor 163 passes through the other side of the rectangular block and connects to the threaded lead screw 162. The telescopic rod 141 is connected to the bottom of the rectangular block.

[0055] The welding mechanism 170 is mounted on the lateral displacement mechanism 160 by sliding to achieve lateral movement, and the welding mechanism 170 is connected to the longitudinal lifting mechanism 140 through the lateral displacement mechanism 160 to achieve longitudinal movement.

[0056] The welding mechanism 170 is a submerged arc welding mechanism, which includes a welding head adjustment mechanism 171, a flux tube 172, a welding wire 173, an arc tube 174, a clamp 175, a welding head 176, and a connecting bracket 177. The welding head 176 is located at the bottom of the clamp 175, and the arc tube 174 and welding wire 173 are inserted into the top of the clamp 175. The welding wire 173 is fed by a wire feeding mechanism, and the arc tube 174 outputs an arc through a high-temperature current. The clamp 175 is connected to the flux tube 172 via the connecting bracket 177. The outlet of the flux tube 172 is located in front of the welding head 176 in the forward direction for flux discharge. (The structure and working principle of the submerged arc welding mechanism are existing technologies; any welding method that can achieve this welding method can be used, and these are not the technical points of this invention, so they will not be described in detail here.)

[0057] Furthermore, in this embodiment, in order to weld the inclined manhole on the spherical tank, a distance sensor is provided on the clamp 175. The distance sensor is connected to the control system via a signal. The distance between the distance sensor and the spherical tank around the manhole is preset in the control system. This distance needs to be measured and referenced in advance to the distance between the welding head 176 and the weld, so that after the clamp 175 is raised and lowered, the distance between the welding head 176 at the bottom of the clamp 175 and the weld is the welding distance of the arc welding. The control system drives the clamp 175 to rise and fall by controlling the welding head adjustment mechanism 171 according to the preset distance parameters, thereby ensuring that the preset distance is always maintained between the welding head 176 connected to the end of the clamp 175 and the weld.

[0058] This embodiment solves the problem of constantly changing welding angles during the welding process of manhole curved section welding by setting a distance sensor on the welding mechanism, which can control the welding head adjustment mechanism on the welding mechanism to make fine adjustments to the clamps of the welding mechanism according to the preset distance data in the control system.

[0059] The welding head adjustment mechanism 171 can fix the clamp 175 of the welding mechanism 170, or it can be configured as a fine-tuning structure to fine-tune the position of the clamp 175 via a slide rail, thereby fine-tuning the distance between the welding head 176 at the bottom of the clamp 175 and the weld. In this embodiment, the fine-tuning welding head adjustment mechanism 171 includes a vertical guide rail 1711, an adapter plate 1713, and a clamping hoop 1714.

[0060] The nut of the lateral displacement mechanism 160 is connected to the vertical guide rail 1711. The vertical guide rail 1711 is connected to the adapter plate 1713 through a slider. The adapter plate 1713 clamps the clamping fixture 175 through the clamping hoop 1714.

[0061] The slider of the vertical guide rail 1711 is driven by an external motor, which is controlled by a control system. When the control system receives a signal from the distance sensor, it controls the external motor to drive the slider to slide within the vertical guide rail 1711, thereby causing the clamp 175, held by the clamping hoop 1714 on the adapter plate 1713 connected to the slider, to rise and fall on the vertical guide rail 1711. Based on the real-time updates and feedback from the distance sensor and the control system, the distance between the welding head 176 connected to the end of the clamp 175 and the weld seam is adjusted in real time, thus always maintaining a consistent welding distance between the two. (The structure and working principle of automatic sliding and lifting via the guide rail are existing technologies. Any technology that can achieve this lifting method can be used, and it is not a technical point of this invention, so it will not be described in detail here.)

[0062] Furthermore, in this embodiment, when temporary fixation is required, an adapter 1712 can be added. The two sides of the adapter 1712 are fixed by the two sides of the adapter plate 1713, thereby limiting the adapter plate 1713 to the vertical guide rail 1711 and preventing it from sliding, thus achieving the function of fixation.

[0063] In addition, such as Figure 2 As shown, the adapter 1712 can also be connected to the adapter plate 1713 by tightening a knob. In this case, the clamp 175 cannot be fine-tuned and can only be fixed.

[0064] Furthermore, in this embodiment, the rotating mechanism includes a mounting base 110, a turntable 120, and a rotating drive mechanism. The turntable 120 is mounted on the mounting base 110 and is concentrically arranged with the mounting base 110. The turntable 120 drives the longitudinal lifting mechanism 140 to achieve the rotation function through the rotating drive mechanism. (The rotating mechanism can be any existing rotating platform capable of in-situ rotation, such as a jewelry display rack or any other rotating mechanism. Since this is not a technical point of this invention, it will not be described in detail here.)

[0065] Furthermore, this embodiment also includes an auxiliary limiting mechanism 130, which includes an outer cover 131, limiting posts 132, connecting ears 133, and an auxiliary plate 134. The outer cover 131 covers the drive mechanism of the longitudinal lifting mechanism 140, and the auxiliary plate 134 is disposed on the outer cover 131. The output end of the drive mechanism is connected to the telescopic rod 141 of the longitudinal lifting mechanism 140 on the auxiliary plate 134. Vertical limiting posts 132 are respectively provided at both ends of the auxiliary plate 134.

[0066] Two sets of connecting ears 133 are respectively set on both sides of the lead screw mounting block 151. The limiting post 132 passes through the connecting ears 133 and is used to provide auxiliary sliding and limiting function for the lead screw mounting block 151 when it rises and falls with the telescopic rod 141.

[0067] The present invention also provides a method for applying the rotatable automatic welding device 100 for the top plate of a spherical tank, comprising the following steps:

[0068] Step S0: Preparation: Determine the distance between the distance sensor on the preset fixture 175 in the control system and the weld seam around the manhole on the spherical tank;

[0069] Step S1: Installation: Fix the automatic welding device 100 inside the platform of the manhole of the spherical tank via the mounting base 110 of the rotating mechanism. The longitudinal lifting mechanism 140 of the automatic welding device 100 achieves the rotation function through the turntable 120 on the mounting base 110.

[0070] Step S2: Adjustment:

[0071] Step S21: Adjust the longitudinal height of the welding mechanism:

[0072] Based on the position of the manhole of the spherical tank, the height of the telescopic rod 141 is adjusted by the drive mechanism of the longitudinal lifting mechanism 140, thereby adjusting the height of the welding mechanism 170 on the lateral displacement mechanism connected to the telescopic rod 141.

[0073] Step S22: Adjust the lateral distance of the welding mechanism:

[0074] Based on the diameter of the manhole of the spherical tank, the screw motor 163 of the lateral displacement mechanism 160 drives the threaded screw 162 to rotate, thereby causing the nut to slide laterally on the threaded screw 162 with the welding mechanism, thereby adjusting the distance between the welding mechanism 170 and the longitudinal lifting mechanism.

[0075] Step S3: Welding: Welding wire 173 of welding mechanism 170 is fed by wire feeding mechanism, arc tube 174 of welding mechanism 170 outputs arc through high temperature current; flux is discharged through flux tube 172 of welding mechanism 170.

[0076] Flux tubes 172 are arranged side by side on the front side of the welding head 176 in the forward direction. First, the flux is dropped onto the weld. Then, the welding head 176 feeds the welding wire through the clamp 175 while outputting an electric arc through the arc tube 174. The welding is achieved in the circumferential direction of the manhole in conjunction with the turntable 120 of the rotating mechanism.

[0077] When the distance sensor on the welding head adjustment mechanism 171 of the welding mechanism 170 detects that the distance between the clamp 175 and the spherical tank is greater than the preset distance, it transmits a signal to the control system. The control system controls the welding head adjustment mechanism 171 to descend, thereby shortening the weld seam distance between the distance sensor on the clamp 175 and the manhole circumference on the spherical tank.

[0078] When the distance sensor on the welding head adjustment mechanism 171 of the welding mechanism 170 detects that the distance between the clamp 175 and the spherical tank is less than the preset distance, it transmits a signal to the control system. The control system controls the welding head adjustment mechanism 171 to rise, thereby increasing the distance between the distance sensor on the clamp 175 and the weld seam around the manhole on the spherical tank.

[0079] The distance between the distance sensor on the fixture and the weld seam around the manhole on the spherical tank is always kept at a constant distance.

[0080] Step S4: The control system in step S3 continuously controls the welding head adjustment mechanism 171 to drive the clamp 175 to rise or fall, and cooperates with the rotation mechanism to realize the welding process of the circular curved surface weld on the manhole of the spherical tank.

[0081] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "lateral," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0082] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0083] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A rotatable automatic welding device for the top plate of a spherical tank, used for welding the manhole of the spherical tank, characterized in that, It includes a longitudinal lifting mechanism (140), a lateral displacement mechanism (160), and a welding mechanism (170). The bottom of the longitudinal lifting mechanism (140) is installed inside the manhole of the spherical tank via a rotating mechanism, and the top of the longitudinal lifting mechanism (140) is connected to the welding mechanism via a transverse displacement mechanism (160) for adjusting the welding height of the welding mechanism (170). The lateral displacement mechanism (160) is connected to the welding mechanism in a sliding manner, and is used to adjust the welding position of the welding mechanism (170) to adapt to manholes of different diameters; The welding mechanism (170) is slidably mounted on the transverse displacement mechanism (160) to achieve transverse movement, and the welding mechanism (170) is connected to the longitudinal lifting mechanism (140) through the transverse displacement mechanism (160) to achieve longitudinal movement; One end of the lateral displacement mechanism (160) is connected to the longitudinal lifting mechanism (140) via the mounting mechanism (150); the longitudinal lifting mechanism (140) includes a telescopic rod (141) and a drive mechanism; the drive mechanism is connected to the telescopic rod (141) via an output shaft, and the telescopic rod (141) is controlled by the output shaft to achieve longitudinal lifting; The lateral displacement mechanism (160) includes a lead screw cover (161), a threaded lead screw (162), a lead screw motor (163), and a nut. The output end of the lead screw motor (163) is connected to the threaded lead screw (162). The threaded lead screw (162) is covered by the lead screw cover (161). One end of the lead screw cover (161) is connected to the telescopic rod (141) of the longitudinal lifting mechanism (140) through an installation mechanism to achieve the lifting function. The nut is threaded through the external thread of the threaded lead screw (162) through its internal thread. The bottom of the nut is connected to the welding mechanism (170). The lead screw motor (163) drives the threaded lead screw (162) to rotate. The nut slides on the threaded lead screw (162) through its thread, thereby driving the welding mechanism (170) connected to the nut to achieve lateral displacement. The mounting mechanism (150) includes a lead screw mounting block (151); the threaded lead screw (162) of the lateral displacement mechanism (160) is connected to the telescopic rod (141) of the longitudinal lifting mechanism (140) through the lead screw mounting block (151). The rotating mechanism includes a mounting base (110), a turntable (120), and a rotating drive mechanism; the mounting base (110) is provided with a turntable (120), the turntable (120) is concentrically arranged with the mounting base (110), and the turntable (120) drives the longitudinal lifting mechanism (140) to achieve the rotation function through the rotating drive mechanism; It also includes an auxiliary limiting mechanism (130), which includes an outer cover (131), limiting posts (132), connecting ears (133), and an auxiliary plate (134). The outer cover (131) covers the drive mechanism of the longitudinal lifting mechanism (140), and the auxiliary plate (134) is disposed on the outer cover (131). The output end of the drive mechanism is connected to the telescopic rod (141) of the longitudinal lifting mechanism (140) on the auxiliary plate (134). Vertical limiting posts (132) are respectively provided at both ends of the auxiliary plate (134). Two sets of connecting ears (133) are respectively set on both sides of the lead screw mounting block (151). The limiting post (132) is inserted into the connecting ear (133) to provide auxiliary sliding and limiting function for the lead screw mounting block (151) when it rises and falls with the telescopic rod (141).

2. The rotatable automatic welding device for the top plate of a spherical tank according to claim 1, characterized in that, The drive mechanism is a hydraulic drive mechanism, a pneumatic drive mechanism, or a worm gear drive mechanism.

3. The rotatable automatic welding device for the top plate of a spherical tank according to claim 2, characterized in that, The worm gear drive includes a worm wheel (144), a worm (142), and a worm drive motor (143); the worm drive motor (143) is connected to the worm (142) through a drive shaft, the worm (142) is meshed with the worm wheel (144), and the output end of the worm wheel (144) is connected to a telescopic rod (141).

4. The rotatable automatic welding device for the top plate of a spherical tank according to claim 3, characterized in that, The welding mechanism is a submerged arc welding mechanism, which includes a welding head adjustment mechanism (171), a flux tube (172), a welding wire (173), an arc tube (174), a clamp (175), a welding head (176), and a connecting bracket (177). The bottom end of the clamp (175) is provided with a welding head (176), and the top end of the clamp (175) is provided with an arc tube (174) and a welding wire (173). The welding wire (173) is fed by a wire feeding mechanism, and the arc tube (174) outputs an arc through a high-temperature current. The clamp (175) is connected to the flux tube (172) via the connecting bracket (177). The outlet of the flux tube (172) is located on the front side of the welding head (176) in the forward direction and is used for flux discharge.

5. The rotatable automatic welding device for the top plate of a spherical tank according to claim 4, characterized in that, The fixture (175) is equipped with a distance sensor, which is connected to the control system via a signal. The control system controls the welding head adjustment mechanism (171) to raise and lower the fixture (175) according to the preset distance parameters, thereby maintaining a preset distance between the welding head (176) connected to the end of the fixture (175) and the weld.

6. An application method of the rotatable automatic welding device for the top plate of a spherical tank according to claim 5, characterized in that, Includes the following steps: Step S0: Preparation: The distance between the distance sensor on the preset fixture (175) in the control system and the weld seam of the manhole on the spherical tank; Step S1: Installation: The automatic welding device (100) is fixed in the platform of the manhole of the spherical tank by the mounting base (110) of the rotating mechanism. The longitudinal lifting mechanism (140) of the automatic welding device (100) realizes the rotation function through the turntable (120) on the mounting base (110). Step S2: Adjustment: Step S21: Adjust the longitudinal height of the welding mechanism: According to the position of the manhole of the spherical tank, the height of the telescopic rod (141) is adjusted by the drive mechanism of the longitudinal lifting mechanism (140), thereby adjusting the height of the welding mechanism (170) on the transverse displacement mechanism connected to the telescopic rod (141); Step S22: Adjust the lateral distance of the welding mechanism: According to the diameter of the manhole of the spherical tank, the screw motor (163) of the transverse displacement mechanism (160) drives the threaded screw (162) to rotate, thereby driving the nut to slide laterally on the threaded screw (162) with the welding mechanism, thereby adjusting the distance between the welding mechanism (170) and the longitudinal lifting mechanism. Step S3: Welding: The welding wire (173) of the welding mechanism (170) is fed by the wire feeding mechanism, and the arc tube (174) of the welding mechanism (170) outputs an arc through a high-temperature current; the flux tube (172) of the welding mechanism (170) discharges the flux. Flux tubes (172) are arranged side by side in front of the welding head (176) in the forward direction. First, the flux is dropped onto the weld. Then, the welding head (176) feeds the welding wire through the clamp (175) while outputting an electric arc through the arc tube (174). The welding is carried out in the circumferential direction of the manhole in conjunction with the turntable (120) of the rotating mechanism. When the distance sensor on the welding head adjustment mechanism (171) of the welding mechanism (170) detects that the distance between the clamp (175) and the spherical tank is greater than the preset distance, it transmits a signal to the control system. The control system controls the welding head adjustment mechanism (171) to descend, thereby shortening the weld seam distance between the distance sensor on the clamp (175) and the manhole circumference on the spherical tank. When the distance sensor on the welding head adjustment mechanism (171) of the welding mechanism (170) detects that the distance between the clamp (175) and the spherical tank is less than the preset distance, it transmits a signal to the control system. The control system controls the welding head adjustment mechanism (171) to rise, thereby increasing the distance between the distance sensor on the clamp (175) and the weld seam around the manhole on the spherical tank. The distance between the distance sensor on the fixture and the weld seam around the manhole on the spherical tank is always kept at a constant distance. Step S4: The control system in step S3 continuously controls the welding head adjustment mechanism (171) to drive the clamp (175) to rise or fall, and cooperates with the rotation mechanism to realize the process of welding the circular curved surface weld on the manhole of the spherical tank.

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