Production system and method for assembling a straight cylinder with a torispherical head

Abstract

The application provides a production system for assembling a four-fluorine straight cylinder and an arc-shaped head, comprising a butt joint device, a hoisting device and a girth welding device; the butt joint device accurately butts joints the four-fluorine straight cylinder and the arc-shaped head and fixes them, so that the girth width formed after the butt joint of the four-fluorine straight cylinder and the arc-shaped head remains unchanged; the hoisting device hoists the girth welding device, so that the girth welding device is clamped on the inner and outer sides of the girth, and the welding end of the girth welding device is clamped on the inner and outer sides of the girth to perform welding, so as to improve the welding efficiency. The application also provides a production method applied to the production system for assembling the four-fluorine straight cylinder and the arc-shaped head, so that the girth width after the butt joint of the straight cylinder part and the arc-shaped head meets the production requirement, the welding efficiency is improved, and the sealing performance of the girth after welding meets the production requirement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of chemical anticorrosion equipment manufacturing, in particular to a production system and method for assembling a four-fluorine straight cylinder and an arc-shaped head. TECHNICAL BACKGROUND

[0002] Chemical anticorrosion equipment is widely used in the fields of chemical production and chemical raw material storage. Currently, for the production of anticorrosion equipment, an anticorrosion plastic lining is covered inside the equipment body to form anticorrosion protection. The equipment body is mostly made of carbon steel and other materials. In recent years, distillation kettles with four-fluorine linings inside the tank body are favored by chemical manufacturers due to their excellent acid and alkali resistance and other excellent properties.

[0003] For example, the utility model patent with application number 202222600861.6 and the name "Split-type steel lining four-fluorine distillation kettle" sets a first four-fluorine lining on the inner wall of the tank body bottom. The first four-fluorine lining is composed of a straight cylinder part and a downwardly recessed recessed part. In the prior art, workers often first place the recessed part in a forming mold of the recessed part, and then insert the straight cylinder part into the recessed part. The recessed part is commonly known as an arc-shaped head in the industry. The straight cylinder part and the arc-shaped head are connected. Finally, a heated welding knife is used to weld the annular gap formed by the mutual connection of the straight cylinder part and the arc-shaped head.

[0004] In the process of connecting the straight cylinder part and the arc-shaped head, workers in the prior art often first place the arc-shaped head in a forming mold of the arc-shaped head, and then insert the straight cylinder part into the arc-shaped head. In this operation method, the straight cylinder part and the arc-shaped head are often connected by relying on the experience of the operator. Since the diameter of the straight cylinder part is about 3 meters, the inclined straight cylinder part after connection by relying on the experience of the operator is not easy to observe with the naked eye. The welding of the inclined straight cylinder part and the arc-shaped head forms an unqualified first four-fluorine lining. This unqualified first four-fluorine lining has the phenomenon of uneven fit during assembly with the corresponding steel shell, which easily causes the first four-fluorine lining to have the phenomena of bulging and cracking.

[0005] In the welding process of the annular seam formed by the butt joint of the straight cylinder part and the arc-shaped head, most of the welding devices in the prior art are welding devices after the overlapping and fixing of the Teflon plates, such as the Teflon plate longitudinal seam welding machine with the application number 201310180074 and the name "Teflon plate longitudinal seam welding machine", which can only weld two overlapping Teflon plates. However, the welding machine adopting the prior art cannot weld the annular seam after the overlapping of the straight cylinder part and the arc-shaped head. Therefore, two operators are required to hold a heated welding knife respectively during the on-site operation, one operator is located inside the Teflon straight cylinder and the arc-shaped head, and the other operator is located outside the Teflon straight cylinder and the arc-shaped head. The two operators hold the welding knives from the two sides of the annular seam and press and heat the welding knives to weld one section of the annular seam. Then, the next section of the annular seam is welded in turn by using the above-mentioned method. This method of welding the annular seam of the Teflon straight cylinder and the arc-shaped head does not have a special welding tool, which leads to low welding efficiency. In addition, the sealing performance cannot meet the production requirements due to the small pressure of the two operators on the annular seam. SUMMARY

[0006] Therefore, the present application provides a production system for assembling a Teflon straight cylinder and an arc-shaped head to solve the problem of the inconsistent width of the annular seam during the butt joint process of the straight cylinder part and the arc-shaped head in the prior art, and the problem of low welding efficiency and the sealing performance after welding that cannot meet the production requirements during the welding process of the annular seam.

[0007] A production system for assembling a Teflon straight cylinder and an arc-shaped head, comprising a butt joint device, a lifting device, and an annular seam welding device. The butt joint device accurately butts joints the Teflon straight cylinder and the arc-shaped head and keeps them fixed, so that the width of the annular seam formed after the butt joint of the Teflon straight cylinder and the arc-shaped head remains unchanged. The lifting device lifts the annular seam welding device and clamps it on the inner and outer sides of the annular seam. The welding end of the annular seam welding device is clamped on the inner and outer sides of the annular seam for welding to improve the welding efficiency.

[0008] The butt joint device comprises a Teflon straight cylinder hoisting assembly and an arc-shaped head supporting assembly. The Teflon straight cylinder hoisting assembly comprises a support frame and a plurality of lifting devices. Each lifting device is arranged on the upper part of the support frame for suspending the Teflon straight cylinder. The arc-shaped head supporting assembly is arranged below the lifting devices for fixing the arc-shaped head. The plurality of lifting devices jointly lift the Teflon straight cylinder so that the Teflon straight cylinder and the arc-shaped head are butted and jointed with each other. The lifting height of each lifting device is adjusted to make the butt joint distance between the lower edge of the Teflon straight cylinder and the upper edge of the arc-shaped head equal.

[0009] The ring seam welding device comprises a frame body, an outer welding cutter and an inner welding cutter, the frame body is in U shape, the frame body comprises a left support arm and a right support arm, the outer welding cutter is arranged on the left support arm, the inner welding cutter is arranged on the right support arm, the outer welding cutter and the inner welding cutter are arranged on the left support arm and the right support arm in a manner that the distance between them can be adjusted, and the outer welding cutter and the inner welding cutter are at the same height so that the outer welding cutter and the inner welding cutter can clamp the ring seam between the four-fluorine straight cylinder and the arc-shaped head and perform welding after being close to each other.

[0010] The hoisting device comprises a truss and an electric hoist, the electric hoist is arranged on the truss and can move along the length direction and the width direction of the truss, the truss and the electric hoist are both located above the four-fluorine straight cylinder hoisting assembly, a hoisting hook is arranged on the electric hoist, the hoisting hook is used for suspending the frame body of the ring seam welding device, and the hoisted ring seam welding device can make the left support arm and the right support arm be located at the inner side and the outer side of the four-fluorine straight cylinder respectively, and the outer welding cutter arranged on the left support arm and the inner welding cutter arranged on the right support arm can reach the inner side and the outer side of the ring seam along the two sides of the four-fluorine straight cylinder respectively.

[0011] Preferably, the support frame comprises a frame and a plurality of support columns, the frame is installed at the upper end of each support column, a plurality of hangers are arranged close to the lower side of the frame, the number of the hangers is consistent with the number of the lifting devices, and each lifting device is arranged on a hanger; wherein the lifting device is a chain hoist, which comprises a fixed hook, a lifting hook, a lifting chain, a manual chain, a housing and a clamping piece, the lower end of the fixed hook is arranged on the housing, the upper end of the fixed hook is hung on the hanger, the lifting chain is arranged on a driven sprocket in the housing, the lifting hook is arranged at one end of the lifting chain, the manual chain is arranged on a driving sprocket in the housing, the manual chain drives the driving sprocket in the housing to rotate, and then drives the driven sprocket in the housing to rotate, and then drives the lifting hook at one end of the lifting chain to complete lifting or lowering, and the clamping piece is installed on the lifting hook to clamp the upper edge of the four-fluorine straight cylinder.

[0012] Preferably, the clamping piece comprises a ring, a U-shaped part and a top wire, the ring is arranged at the top end of the U-shaped part, a first threaded hole is arranged on one side wall of the U-shaped part, the top wire is installed in the first threaded hole, the ring and the lifting hook are hooked with each other, and the front end of the top wire and the U-shaped part are close to each other to clamp the upper edge of the four-fluorine straight cylinder; the hanger is a semicircular shape, an opening is arranged on the hanger, and the hook is inserted into the opening to suspend the lifting device on the hanger; a reinforcing support is arranged between the frame and the support column, one end of the reinforcing support is arranged on the support column, and the other end of the reinforcing support is arranged on the frame.

[0013] Preferably, the arc-shaped head support assembly is located below the plurality of lifting hooks; the arc-shaped head support assembly comprises an arc-shaped head support base, the arc-shaped head support base is internally provided with a hollow arc-shaped cavity, the spacing between adjacent lifting hooks is equal, and the central axis of the hollow arc-shaped cavity and the central axis of the space formed by the plurality of lifting hooks coincide with each other.

[0014] Preferably, the left support arm and the right support arm are equal in length, the outer welding cutter is arranged at the lower end of the left support arm, and the inner welding cutter is arranged at the lower end of the right support arm; a second threaded hole is arranged at the lower end of the left support arm, and a threaded rod is installed in the second threaded hole; a fixed column is arranged at the lower end of the right support arm; the axis of the threaded rod coincides with the axis of the fixed column; a first fixed hole is arranged on the arc-shaped outer side wall of the outer welding cutter, the front end of the threaded rod is inserted into the first fixed hole, a second fixed hole is arranged on the arc-shaped inner side wall of the inner welding cutter, and the front end of the fixed column is inserted into the second fixed hole; the threaded rod is rotated to push the outer welding cutter close to the inner welding cutter to gradually clamp and weld the girth of the four-fluorine straight cylinder and the arc-shaped head.

[0015] Preferably, a fixed seat is arranged on the lower end surface of the left support arm, a third threaded hole is arranged on the fixed seat, and a threaded rod is installed in the third threaded hole; one end of the threaded rod is provided with a rotating handle, and the rotating handle and the outer welding cutter are respectively located on the two sides of the fixed seat; a support portion is arranged at the lower end of the right support arm, the support portion is a channel steel, the support portion is arranged on the side wall of the right support arm, and the side of the support portion close to the left support arm is provided with a fixed column close to the lower end of the support portion.

[0016] Preferably, a lifting portion is arranged at the middle position of the top of the support frame, a through hole is arranged at the middle position of the lifting portion, the through hole is used in combination with the lifting hook of the electric hoist to facilitate lifting the girth welding device; a plurality of stepping levers are arranged on the right support arm, the plurality of stepping levers are arranged in a row on the side wall of the right support arm, and each stepping lever is arranged opposite to the inner welding cutter on the circumferential side wall of the right support arm; a first arc-shaped extension is arranged on each side of the inner welding cutter, the center of the first arc-shaped extension coincides with the center of the arc where the outer side wall of the inner welding cutter is located; a second arc-shaped extension is arranged on each side of the outer welding cutter, the center of the second arc-shaped extension coincides with the center of the arc where the inner side wall of the outer welding cutter is located; a first handle is arranged on the upper side wall of the outer welding cutter, and a second handle is arranged on the upper side wall of the inner welding cutter.

[0017] The production system for assembling the four-fluorine straight cylinder and the arc-shaped head has the beneficial effects that each lifting appliance of the butt joint device 100 is arranged at the upper portion of the support frame to suspend the upper edge of the four-fluorine straight cylinder, the arc-shaped head support assembly is arranged below the lifting appliance to fix the arc-shaped head, the lifting height of each lifting appliance is adjusted to adjust the butt joint distance between the lower edge of the four-fluorine straight cylinder and the upper edge of the arc-shaped head to be equal, and the central axes of the straight cylinder part and the arc-shaped head are overlapped with each other after the butt joint of the straight cylinder part and the arc-shaped head; then the girth seam welding device is lifted by the lifting device, and the girth seam welding device is clamped on the inner and outer sides of the girth seam; the inner welding cutter and the outer welding cutter are clamped on the two sides of the girth seam by adjusting the distance between the inner welding cutter and the outer welding cutter, and then a section of the clamped girth seam is welded, the inner welding cutter and the outer welding cutter are loosened after the welding is completed, and then the inner welding cutter and the outer welding cutter are moved to the next welding position for clamping and welding, and each time of clamping and welding overlaps the previous welding by a section to prevent partial welding from being not firm and causing the girth seam to fail to meet the sealing requirement.

[0018] A production method for assembling a four-fluorine straight cylinder and an arc-shaped head, which is applied to the production system for assembling the four-fluorine straight cylinder and the arc-shaped head, and includes the following steps.

[0019] S1, fixing of the arc-shaped head: the arc-shaped head is placed in the arc-shaped head support assembly, the arc-shaped head is adjusted so that the upper end of the arc-shaped head is in a horizontal state, fine sand is added into the arc-shaped head, and the arc-shaped head is fixed in the arc-shaped head support assembly by using the gravity of the fine sand, and the upper end of the fixed arc-shaped head is in a horizontal state.

[0020] S2, lifting of the four-fluorine straight cylinder and butt joint with the arc-shaped head: a plurality of lifting appliances are respectively fixed on the upper edge of the four-fluorine straight cylinder, the lifting height of each lifting appliance is adjusted so that the lower edge of the four-fluorine straight cylinder is higher than the upper edge of the fixed arc-shaped head, then the arc-shaped head support assembly or the four-fluorine straight cylinder lifting assembly is moved so that the lower end of the four-fluorine straight cylinder and the upper end of the arc-shaped head are aligned, each lifting appliance is adjusted again so that the four-fluorine straight cylinder gradually descends, and then the four-fluorine straight cylinder and the arc-shaped head are sleeved, the contact surface of the four-fluorine straight cylinder and the arc-shaped head forms a girth seam, a four-fluorine welding rod is placed in the girth seam, the width of the four-fluorine welding rod is consistent with the width of the girth seam, the distance between the lower edge of the four-fluorine straight cylinder and the upper edge of the arc-shaped head is the width of the girth seam, the width of the girth seam is checked whether it meets the welding width, and it is ensured that the girth seam width is equal, and the girth seam width is adjusted by adjusting the corresponding lifting appliance if the girth seam width is not equal, and the girth seam width is consistent and continuously maintained.

[0021] S3, lifting and placing the girth welding device with the lifting device, so that the girth welding device is clamped on both sides of the girth: lifting the girth welding device with the lifting device, after the lower end of the girth welding device is higher than the upper end of the four-fluorine straight cylinder, the lifting device translates the girth welding device to the top of the four-fluorine straight cylinder side wall, and gradually lowers the girth welding device with the lifting device to clamp the girth welding device on both sides of the four-fluorine straight cylinder side wall, and continues to lower the girth welding device with the lifting device until the inner and outer welding knives of the girth welding device are clamped on the inner and outer sides of the girth for welding.

[0022] S4, adjusting the lifting device to hoist the girth welding device to rotate intermittently around the girth to heat and weld a section of the girth, and after completing the welding of the entire girth, the girth welding device is removed from the four-fluorine straight cylinder.

[0023] S5, after the welded girth is naturally cooled, the edge of the girth is cut, and the fine sand is removed for cleaning.

[0024] Preferably, during the process of "fixing the arc-shaped head", fine sand is laid at the bottom of the arc-shaped head support assembly, and then the arc-shaped head is placed in the arc-shaped head support assembly, and then fine sand is added to the arc-shaped head support assembly to maintain the same thickness of fine sand between the arc-shaped head support assembly and the arc-shaped head, so that the length of the opening upper end of the arc-shaped head extending out of the arc-shaped head support assembly meets the requirement of butt joint length; during the process of "lifting the four-fluorine straight cylinder and butt jointing with the arc-shaped head", first mark a first mark line on the outer or inner wall of the fixed arc-shaped head, and the vertical distance between the first mark line and the upper port of the arc-shaped head is equal; also mark a second mark line on the outer or inner wall of the four-fluorine straight cylinder, and the vertical distance between the second mark line and the lower port of the four-fluorine straight cylinder is equal; the vertical distance between the first mark line and the upper port of the arc-shaped head is equal to the vertical distance between the second mark line and the lower port of the four-fluorine straight cylinder; during the process of butt jointing the four-fluorine straight cylinder and the arc-shaped head, the butt jointing is completed by overlapping the lower port of the four-fluorine straight cylinder and the first mark line; or during the process of butt jointing the four-fluorine straight cylinder and the arc-shaped head, the butt jointing is completed by overlapping the upper port of the arc-shaped head and the second mark line.

[0025] Preferably, in the process of "lifting and placing the girth welding device by the lifting device, so that the girth welding device is clamped on both sides of the girth", one operator stands in the arc-shaped head laid with fine sand to operate the inner welding knife to make the upper end surface of the inner welding knife horizontal, and another operator stands outside the girth to operate the outer welding knife to make the upper end surface of the outer welding knife horizontal; in the process of "adjusting the lifting device to hoist the girth welding device to rotate intermittently around the girth to heat and weld a section of the girth", the girth clamped by the last inner welding knife and the outer welding knife overlaps the girth clamped by the previous inner welding knife and the outer welding knife by 1-2 cm, so as to prevent the situation that a section of the girth is not connected, which leads to that the sealing performance cannot meet the standard.

[0026] Compared with the prior art, the production method of assembling the four-fluorine straight cylinder and the arc-shaped head has the beneficial effects that: the butt joint device is used to complete the accurate butt joint of the four-fluorine straight cylinder and the arc-shaped head, the lifting device is used to place and clamp the girth welding device on the inner and outer sides of the weld, and the outer welding knife and the inner welding knife of the girth welding device are used to clamp and weld each section of the girth in turn along the girth, so that the firmness and the sealing performance of the girth of the four-fluorine straight cylinder and the arc-shaped head can meet the production requirements, and the phenomenon that the first four-fluorine inner liner at the bottom of the kettle body is prone to bulging or cracking due to the inclination of the four-fluorine straight cylinder is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a perspective view of the present application.

[0028] Figure 2 is a use state diagram of the present application.

[0029] Figure 3 is a perspective view of the lifting device and the girth welding device after assembly.

[0030] Figure 4 is a perspective view of the butt joint device.

[0031] Figure 5 is a perspective view of the lifting tool.

[0032] Figure 6 is a perspective view of the clamping piece.

[0033] Figure 7 is a use state diagram of the butt joint device.

[0034] Figure 8 is a perspective view of the girth welding device.

[0035] Figure 9 is a perspective exploded view of the girth welding device.

[0036] Figure 10 is a front view of the girth welding device.

[0037] Figure 11 is a use state sectional view of the girth welding device.

[0038] In the figure: butt joint device 100, four-fluorine straight cylinder hoisting assembly 110, support frame 111, frame 1111, support column 1112, hanging piece 1113, lifting tool 112, fixed hook 1121, lifting hook 1122, lifting chain 1123, manual chain 1124, shell 1125, clamping piece 1126, hanging ring 11261, U-shaped part 11262, top wire 11263, arc-shaped head support assembly 120, arc-shaped head support base 121, arc-shaped cavity 122, lifting device 200, truss 210, crossbeam 211, guide rail 212, support body 213, electric hoist 220, lifting hook 221, girth welding device 300, frame body 310, left support arm 311, fixed seat 3111, right support arm 312, stepping lever 3121, second threaded hole 313, threaded rod 314, fixed column 315, rotating handle 316, support part 317, hoisting part 318, through hole 319, outer welding cutter 320, first fixed hole 321, first handle 322, second arc-shaped extension part 323, inner welding cutter 330, second fixed hole 331, second handle 332, first arc-shaped extension part 333. DETAILED DESCRIPTION

[0039] The technical solutions and technical effects of the specific embodiments are further described in detail in combination with the drawings of the application.

[0040] Please refer to Figures 1 to 11 , the production system for assembling the four-fluorine straight cylinder and the arc-shaped head includes the butt joint device 100, the lifting device 200 and the girth welding device 300; the butt joint device 100 accurately butts joints the four-fluorine straight cylinder 400 and the arc-shaped head 500 and keeps them fixed, so that the width of the girth 600 formed after the butt joint of the four-fluorine straight cylinder 400 and the arc-shaped head 500 remains unchanged; the lifting device 200 lifts the girth welding device 300 and makes the girth welding device 300 clamped on the inner and outer sides of the girth 600; the welding end of the girth welding device 300 is clamped on the inner and outer sides of the girth 600 for welding to improve the welding efficiency.

[0041] The docking device 100 comprises a fluorine-free straight cylinder lifting assembly 110 and an arc-shaped head support assembly 120. The fluorine-free straight cylinder lifting assembly 110 comprises a support frame 111 and a plurality of lifting devices 112. Each lifting device 112 is arranged on the upper part of the support frame 111 for suspending the fluorine-free straight cylinder 400. The arc-shaped head support assembly 120 is arranged below the lifting devices 112 for fixing the arc-shaped head 500. After the plurality of lifting devices 112 collectively lift the fluorine-free straight cylinder 400, the fluorine-free straight cylinder 400 and the arc-shaped head 500 are inserted and docked with each other. The lifting height of each lifting device 112 is adjusted to equalize the vertical distance between the lower edge of the fluorine-free straight cylinder 400 and the upper edge of the arc-shaped head 500, so that the fluorine-free straight cylinder 400 and the arc-shaped head 500 are welded to form a first fluorine-free inner liner that meets the production requirements. The first fluorine-free inner liner that meets the production requirements ensures that the two are evenly matched during the assembly process with the corresponding steel shell, preventing the first fluorine-free inner liner at the bottom of the kettle body from easily bulging or cracking during later production. If the inclination of the fluorine-free straight cylinder 400 exceeds the production requirements, the corresponding straight cylinder part of the first fluorine-free inner liner will have different stretching degrees during the steam pressurization process with the corresponding steel shell, and will crack when the stretching amount reaches the stretching limit of the first fluorine-free inner liner. At the same time, the combination of the inclined straight cylinder part and the steel shell has a weak adhesion due to the inclination, and the straight cylinder part with weak adhesion will loosen and fall off during later use, and the loosened straight cylinder part will bulge.

[0042] The girth welding device 300 comprises a frame body 310, an outer welding cutter 320, and an inner welding cutter 330. The frame body 310 is in the shape of a U. The frame body 310 comprises a left support arm 311 and a right support arm 312. The outer welding cutter 320 is arranged on the left support arm 311, and the inner welding cutter 330 is arranged on the right support arm 312. The outer welding cutter 320 and the inner welding cutter 330 are arranged on the left support arm 311 and the right support arm 312 in a manner that their distances can be adjusted. The outer welding cutter 320 and the inner welding cutter 330 are at the same height so that they can clamp and weld the girth 600 of the fluorine-free straight cylinder 400 and the arc-shaped head 500 after they are close to each other.

[0043] The lifting device 200 comprises a truss 210 and an electric hoist 220. The truss 210 comprises a crossbeam 211, two guide rails 212 and two support bodies 213. One guide rail 212 is arranged at each end of the crossbeam 211. Each guide rail 212 is arranged on a support body 213. Each guide rail 212 is horizontally arranged. The two guide rails 212 are at the same height. The crossbeam 211 slides along the guide rails 212. The electric hoist 220 is arranged on the crossbeam 211. The electric hoist 220 moves along the length direction of the crossbeam 211. The sliding direction of the crossbeam 211 along the guide rails 212 and the moving direction of the electric hoist 220 along the crossbeam 211 are perpendicular to each other. The truss 210 and the electric hoist 220 are both above the PTFE straight cylinder lifting assembly 110. A lifting hook 221 is arranged on the electric hoist 220. The lifting hook 221 is used for suspending the frame 310 of the girth welding device 300. After being lifted, the girth welding device 300 can make the left support arm 311 and the right support arm 312 be respectively located on the inner side and the outer side of the PTFE straight cylinder 400. The outer welding cutter 320 arranged on the left support arm 311 and the inner welding cutter 330 arranged on the right support arm 312 can respectively reach the inner side and the outer side of the girth 600 along the two sides of the PTFE straight cylinder 400. The movement of the electric hoist 220 along the crossbeam 211 and the movement of the crossbeam 211 along the guide rails 212 together make the suspended girth welding device 300 move along the girth 600 intermittently. The girth welding device 300 completes the welding of the girth 600 in the process of moving along the girth 600 intermittently.

[0044] Further, the support frame 111 comprises a frame 1111 and a plurality of support columns 1112. The frame 1111 is installed at the upper end of each support column 1112. A plurality of hangers 1113 are arranged near the lower side of the frame 1111. The number of the hangers 1113 is consistent with the number of the lifting devices 112. Each lifting device 112 is arranged on a hanger 1113. The lifting device 112 is a drop chain, which comprises a fixed hook 1121, a lifting hook 1122, a lifting chain 1123, a manual chain 1124, a housing 1125 and a clamping piece 1126. The lower end of the fixed hook 1121 is arranged on the housing 1125. The upper end of the fixed hook 1121 is hung on the hanger 1113. The lifting chain 1123 is arranged on a driven sprocket in the housing 1125. The lifting hook 1122 is arranged at one end of the lifting chain 1123. The manual chain 1124 is arranged on a driving sprocket in the housing 1125. The manual chain 1124 drives the driving sprocket in the housing 1125 to rotate, which drives the driven sprocket in the housing 1125 to rotate. The driven sprocket drives the lifting hook 1122 at one end of the lifting chain 1123 to rise or fall after the driven sprocket rotates. The clamping piece 1126 is installed on the lifting hook 1122 to clamp the upper edge of the PTFE straight cylinder 400.

[0045] Further, the clamping piece 1126 comprises a hanging ring 11261, a U-shaped part 11262 and a top screw 11263, the hanging ring 11261 is arranged at the top end of the U-shaped part 11262, one side wall of the U-shaped part 11262 is provided with a first threaded hole, the top screw 11263 is arranged in the first threaded hole, the hanging ring 11261 and the lifting hook 1122 are hooked with each other, the front end of the top screw 11263 and the U-shaped part 11262 are close to each other and then the upper edge of the four-fluorine straight cylinder 400 is clamped; the hanging piece 1113 is semicircular, the hanging piece 1113 is provided with an opening 11131, the hook is inserted into the opening 11131 and then the lifting appliance 112 is hung on the hanging piece 1113; the reinforcing support 113 is arranged between the frame 1111 and the support column 1112, one end of the reinforcing support 113 is arranged on the support column 1112, and the other end of the reinforcing support 113 is arranged on the frame 1111.

[0046] Further, the arc-shaped head support assembly 120 is located below the plurality of lifting hooks 1122; the arc-shaped head support assembly 120 comprises an arc-shaped head support base 121, the arc-shaped head support base 121 is internally provided with an arc-shaped cavity 122, the spacing between adjacent lifting hooks 1122 is equal, the central axis of the hollow arc-shaped cavity 122 and the central axis of the space formed by the plurality of lifting hooks 1122 coincide with each other.

[0047] Further, the left support arm 311 and the right support arm 312 are equal in length, the outer welding blade 320 is arranged at the lower end of the left support arm 311, the inner welding blade 330 is arranged at the lower end of the right support arm 312, the equal length of the left support arm 311 and the right support arm 312 can align the upper end surface of the outer welding blade 320 and the upper end surface of the inner welding blade 330, the lower end surface of the outer welding blade 320 and the lower end surface of the inner welding blade 330, respectively, so that the outer welding blade 320 and the inner welding blade 330 can be clamped on both sides of the ring seam after being clamped, to ensure that the outer welding blade 320 and the inner welding blade 330 are aligned, thereby ensuring that the width of the ring seam after welding is fully sealed reaches the width of the inner welding blade 330, so that the welding of the ring seam 600 is firm; if the outer welding blade 320 and the inner welding blade 330 are not aligned, the width of the sealing welding seam 600 completed after the outer welding blade 320 and the inner welding blade 330 are close to each other is less than the width of the inner welding blade 330. The lower end of the left support arm 311 is provided with a second threaded hole 313, and a threaded rod 314 is installed in the second threaded hole 313; the lower end of the right support arm 312 is provided with a fixed column 315; the arc-shaped outer wall of the outer welding blade 320 is provided with a first fixed hole 321, the front end of the threaded rod 314 is inserted into the first fixed hole 321, the arc-shaped inner wall of the inner welding blade 330 is provided with a second fixed hole 331, the front end of the fixed column 315 is inserted into the second fixed hole 331, the threaded rod 314 is rotated to push the outer welding blade 320 close to the inner welding blade 330 to gradually clamp the ring seam 600 between the four fluorine straight cylinder 400 and the arc-shaped head 500 for welding; the axis of the threaded rod 314 and the axis of the fixed column 315 coincide, so that the outer welding blade 320 installed at the front end of the threaded rod 314 and the inner welding blade 330 installed at the front end of the fixed column 315 are close to each other after being clamped at the ring seam 600, so that the upper and lower surfaces of the outer welding blade 320 and the inner welding blade 330 are aligned.

[0048] Further, the lower end surface of the left support arm 311 is provided with a fixing seat 3111, the fixing seat 3111 is provided with a second threaded hole 313, a threaded rod 314 is installed in the second threaded hole 313, one end of the threaded rod 314 is provided with a rotating handle 316, and the rotating handle 316 and the outer welding cutter 320 are located on the two sides of the fixing seat 3111 respectively; the lower end of the right support arm 312 is provided with a support part 317, the support part 317 is a channel steel, the support part 317 is arranged on the side wall of the right support arm 312, the support part 317 is arranged close to the left support arm 311, a fixing column 315 is arranged on the support part 317, and the fixing column 315 is arranged close to the lower end of the support part 317. Since the fixing column 315 is arranged close to the lower end of the support part 317 and close to the left support arm 311, the fixing column 315 and the second fixing hole 331 of the inner welding cutter 330 can make the inner welding cutter 330 descend into the arc-shaped head 500 after being combined, so that the outer welding cutter 320 and the inner welding cutter 330 can clamp the annular gap 600, and the convenience in the welding process is increased. If the inner welding cutter 330 is located at the upper end of the right support arm 312, the right support arm 312 will touch the bottom of the arc-shaped head 500 when extending into the arc-shaped head 500, so that the inner welding cutter 330 can be clamped at the annular gap 600 between the four-fluorine straight cylinder and the arc-shaped head. If the annular gap 600 is relatively high relative to the bottom of the arc-shaped head 500, it can be processed, and if the annular gap 600 is relatively close to the bottom of the arc-shaped head 500, it cannot be welded.

[0049] Further, the hoisting part 318 is arranged at the middle position of the top of the frame body 310, and a through hole 319 is arranged at the middle position of the hoisting part 318, which is used in combination with the lifting hook 221 of the electric hoist 220 to facilitate hoisting of the ring seam welding device 300; a plurality of stepping levers 3121 are arranged on the right supporting arm 312, and the plurality of stepping levers 3121 are arranged in a row on the side wall of the right supporting arm 312, each stepping lever 3121 is arranged opposite to the inner welding cutter 330 on the circumferential side wall of the right supporting arm 312; a first arc-shaped extension part 333 is arranged on each side of the inner welding cutter 330, and the center of the first arc-shaped extension part 333 coincides with the center of the arc in which the outer side wall of the inner welding cutter 330 is located; a second arc-shaped extension part 323 is arranged on each side of the outer welding cutter 320, and the center of the second arc-shaped extension part 323 coincides with the center of the arc in which the inner side wall of the outer welding cutter 320 is located. The first arc-shaped extension part 333 increases the length of the inner welding cutter 330, and the inner welding cutter 330 and the outer welding cutter 320 after increasing the length can clamp a longer ring seam, and the first arc-shaped extension part 333 and the second arc-shaped extension part 322 on one side clamp and fix the welded ring seam to prevent the welded part of the ring seam 600 from being squeezed apart during clamping of the inner welding cutter 330 and the outer welding cutter 320, and the first arc-shaped extension part 333 and the second arc-shaped extension part 322 on the other side clamp and preheat the un-welded ring seam 600 to be welded again by the inner welding cutter 330 and the outer welding cutter 320, thereby improving the welding efficiency. The first handle 322 is arranged on the upper side wall of the outer welding cutter 320, and the second handle 332 is arranged on the upper side wall of the inner welding cutter 330; the first handle 322 and the second handle 332 facilitate the operator to wear fireproof gloves to hold the outer welding cutter 320 and the inner welding cutter 330, or the first handle 322 and the second handle 332 facilitate the operator to use a hand clamp to hold the outer welding cutter 320 and the inner welding cutter 330.

[0050] The production system for assembling the four-fluorine straight cylinder and the arc-shaped head has the beneficial effects compared with the prior art that each lifting appliance 112 of the butt joint device 100 is arranged at the upper portion of the support frame 111 for suspending the upper edge of the four-fluorine straight cylinder 400, the arc-shaped head support assembly 120 is arranged below the lifting appliance 112 for fixing the arc-shaped head 500, the lifting height of each lifting appliance 112 is adjusted to adjust the butt joint distance of the lower edge of the four-fluorine straight cylinder 400 and the upper edge of the arc-shaped head 500 to be equal, and the central axis of the straight cylinder part and the central axis of the arc-shaped head 500 are overlapped with each other after the butt joint of the straight cylinder part and the arc-shaped head 500; then the girth seam welding device 300 is lifted by the lifting device 200 and then clamped on the inner and outer sides of the girth seam 600; the inner welding cutter 330 and the outer welding cutter 320 are clamped on the two sides of the girth seam 600 by adjusting the distance between the inner welding cutter 330 and the outer welding cutter 320, and then a section of the clamped girth seam 600 is welded, the inner welding cutter 330 and the outer welding cutter 320 are loosened after the welding is completed, and then moved to the next welding position for clamping and welding, and each time of clamping and welding overlaps the last welding by a section to prevent the girth seam 600 from being unable to meet the sealing requirement due to the partial welding being not firm.

[0051] The production method for assembling the four-fluorine straight cylinder and the arc-shaped head is applied to the production system for assembling the four-fluorine straight cylinder and the arc-shaped head, and includes the following steps.

[0052] S1, fixing of the arc-shaped head 500: the arc-shaped head 500 is placed in the arc-shaped head support assembly 120, the arc-shaped head 500 is adjusted so that the upper end of the arc-shaped head 500 is in a horizontal state, fine sand is added into the arc-shaped head 500, the arc-shaped head 500 is fixed in the arc-shaped head support assembly 120 by using the gravity of the fine sand, and the upper end of the fixed arc-shaped head 500 is in a horizontal state.

[0053] S2, after lifting the four fluorine straight cylinder 400 and butting with the arc-shaped head 500: using multiple lifting devices 112 fixed on the upper edge of the four fluorine straight cylinder 400, adjusting the lifting height of each lifting device 112 to adjust the lower edge of the four fluorine straight cylinder 400 to be higher than the upper edge of the fixed arc-shaped head 500, then moving the arc-shaped head support assembly 120 or the four fluorine straight cylinder lifting assembly 110 to align the lower end of the four fluorine straight cylinder 400 with the upper end of the arc-shaped head 500, adjusting each lifting device 112 again to gradually lower the four fluorine straight cylinder 400, then fitting the four fluorine straight cylinder 400 and the arc-shaped head 500, the contact surface of the four fluorine straight cylinder 400 and the arc-shaped head 500 forms a ring gap 600, a four fluorine welding rod is placed in the ring gap 600, the width of the four fluorine welding rod is consistent with the width of the ring gap 600, the distance between the lower edge of the four fluorine straight cylinder 400 and the upper edge of the arc-shaped head 500 is the width of the ring gap 600, checking whether the width of the ring gap 600 reaches the welding width, and ensuring that the width of the ring-shaped ring gap 600 is equal, if the width of the ring gap 600 is not equal, the corresponding lifting device 112 needs to be adjusted to make the width of the ring gap 600 at each place equal, and the width of the ring gap 600 is consistent and continuously maintained.

[0054] S3, lifting and placing the ring gap welding device 300 with the lifting device 200, so that the ring gap welding device 300 is clamped on both sides of the ring gap 600: lifting the ring gap welding device 300 with the lifting device 200, after the lower end of the lifted ring gap welding device 300 is higher than the upper end of the four fluorine straight cylinder 400, the lifting device 200 translates the ring gap welding device 300 to the upper side of the four fluorine straight cylinder 400, gradually lowering the ring gap welding device 300 with the lifting device 200 to clamp the ring gap welding device 300 on both sides of the four fluorine straight cylinder 400, and continuing to lower the ring gap welding device 300 with the lifting device 200 until the inner and outer welding knives 330 and 320 of the ring gap welding device 300 are clamped on the inner and outer sides of the ring gap 600 for welding. Among them, the ring gap welding device 300 first performs a section of heating and welding on the ring gap 600 between the adjacent two lifting devices 112, please refer to the lifting device 112 in the embodiment of Figure 1 , Figure 1 The lifting device 112 is four, so the four lifting devices 112 are first heated and welded on the four ring gaps communicated by the adjacent two lifting devices 112, after welding and fixing, the butt joint device 100 is removed to facilitate the rotation of the ring gap welding device 300 around the ring gap 600 under the lifting of the lifting device 200.

[0055] S4, adjusting the lifting device 200 to intermittently rotate the ring gap welding device 300 around the ring gap 600 to heat and weld a section of the ring gap 600, and then taking out the ring gap welding device 300 from the four fluorine straight cylinder 400 after completing the welding of the entire ring gap 600.

[0056] S5, after the welding of the ring gap 600 is naturally cooled, the edge of the ring gap 600 is cut, the fine sand is taken out, and then washed.

[0057] Further, in the process of "fixing the arc-shaped head 500", the bottom of the arc-shaped head support assembly 120 is paved with fine sand, and then the arc-shaped head 500 is placed in the arc-shaped head support assembly 120. Then, fine sand is added to the arc-shaped head support assembly 120 to keep the same thickness of fine sand between the arc-shaped head support assembly 120 and the arc-shaped head 500. Through a layer of fine sand between the arc-shaped head support assembly 120 and the arc-shaped head 500, the length of the open upper end of the arc-shaped head 500 extending out of the arc-shaped head support assembly 120 reaches the requirement of the butt joint length. In the process of "lifting the four-fluorine straight cylinder 400 and butt jointing with the arc-shaped head 500", first, a first marking line is marked on the outer wall or inner wall of the fixed arc-shaped head 500. The vertical distance between the first marking line and the upper port of the arc-shaped head 500 is equal. A second marking line is also needed to be marked on the outer wall or inner wall of the four-fluorine straight cylinder 400. The vertical distance between the second marking line and the lower port of the four-fluorine straight cylinder 400 is equal. The vertical distance between the first marking line and the upper port of the arc-shaped head 500 is equal to the vertical distance between the second marking line and the lower port of the four-fluorine straight cylinder 400. In the process of butt jointing the four-fluorine straight cylinder 400 and the arc-shaped head 500, the butt jointing is completed by overlapping the lower port of the four-fluorine straight cylinder 400 and the first marking line. Or, in the process of butt jointing the four-fluorine straight cylinder 400 and the arc-shaped head 500, the butt jointing is completed by overlapping the upper port of the arc-shaped head 500 and the second marking line.

[0058] Further, in the process of "fixing the arc-shaped head 500", the bottom of the arc-shaped head support assembly 120 is paved with fine sand, and then the arc-shaped head 500 is placed in the arc-shaped head support assembly 120. Then, fine sand is added to the arc-shaped head support assembly 120 to keep the same thickness of fine sand between the arc-shaped head support assembly 120 and the arc-shaped head 500. Through a layer of fine sand between the arc-shaped head support assembly 120 and the arc-shaped head 500, the length of the open upper end of the arc-shaped head 500 extending out of the arc-shaped head support assembly 120 reaches the requirement of the butt joint length. In the process of "lifting the four-fluorine straight cylinder 400 and butt jointing with the arc-shaped head 500", first, a first marking line is marked on the outer wall or inner wall of the fixed arc-shaped head 500. The vertical distance between the first marking line and the upper port of the arc-shaped head 500 is equal. A second marking line is also needed to be marked on the outer wall or inner wall of the four-fluorine straight cylinder 400. The vertical distance between the second marking line and the lower port of the four-fluorine straight cylinder 400 is equal. The vertical distance between the first marking line and the upper port of the arc-shaped head 500 is equal to the vertical distance between the second marking line and the lower port of the four-fluorine straight cylinder 400. In the process of butt jointing the four-fluorine straight cylinder 400 and the arc-shaped head 500, the butt jointing is completed by overlapping the lower port of the four-fluorine straight cylinder 400 and the first marking line. Or, in the process of butt jointing the four-fluorine straight cylinder 400 and the arc-shaped head 500, the butt jointing is completed by overlapping the upper port of the arc-shaped head 500 and the second marking line.

[0059] Further, in the process of "fixing the arc-shaped head 500", the bottom of the arc-shaped head support assembly 120 is now laid with fine sand, and then the arc-shaped head 500 is placed in the arc-shaped head support assembly 120, and then fine sand is added to the arc-shaped head support assembly 120 to keep the same thickness of fine sand between the arc-shaped head support assembly 120 and the arc-shaped head 500. The length of the open upper end of the arc-shaped head 500 extending out of the arc-shaped head support assembly 120 reaches the requirement of the butt joint length through the layer of fine sand between the arc-shaped head support assembly 120 and the arc-shaped head 500.

[0060] Further, in the process of "lifting and placing the ring seam welding device with the lifting device, and clamping the ring seam welding device on both sides of the ring seam", one operator stands in the arc-shaped head 500 laid with fine sand to operate the inner welding knife 330 to make the upper end surface of the inner welding knife 330 horizontal, and another operator stands outside the ring seam 600 to operate the outer welding knife 320 to make the upper end surface of the outer welding knife 320 horizontal; the ring seam 600 clamped by the last inner welding knife 330 and outer welding knife 320 and the ring seam 600 clamped by the previous inner welding knife 330 and outer welding knife 320 overlap by 1-2 cm to prevent a certain section of the ring seam 600 from being falsely connected, which causes the sealing performance to fail to meet the standard.

[0061] Further, in the process of "adjusting the lifting device to hoist the ring seam welding device to intermittently rotate around the ring seam to heat and weld a section of the ring seam", the ring seam clamped by the last inner welding knife and outer welding knife and the ring seam clamped by the previous inner welding knife and outer welding knife overlap by 1-2 cm to prevent a certain section of the ring seam from being falsely connected, which causes the sealing performance to fail to meet the standard.

[0062] The production method of assembling the above-mentioned four-fluorine straight cylinder 400 and the arc-shaped head 500 has the beneficial effects compared with the prior art: through the butt joint device 100, the accurate butt joint of the four-fluorine straight cylinder 400 and the arc-shaped head 500 is completed, through the lifting device 200, the ring seam welding device 300 is placed and clamped on the inner and outer sides of the weld, and through the outer welding knife 320 and the inner welding knife 330 of the ring seam welding device 300, each section of the ring seam 600 is clamped and welded in turn along the ring seam 600, finally the ring seam 600 of the four-fluorine straight cylinder 400 and the arc-shaped head 500 is firm and sealed, which meets the production requirements, and also avoids the problem that the four-fluorine straight cylinder 400 is inclined, which causes the first four-fluorine inner liner at the bottom of the kettle body to easily bulge or crack.

Claims

1. A production system for assembling a four-fluorinated straight cylinder and an arc-shaped head, characterized by, The application relates to a butt joint device, a lifting device and a girth welding device; the butt joint device accurately butts and fixes a four-fluorine straight cylinder and an arc-shaped head, so that the girth width of the four-fluorine straight cylinder and the arc-shaped head remains unchanged after butt joint; the lifting device lifts the girth welding device, so that the girth welding device is clamped on the inner and outer sides of the girth, and the welding end of the girth welding device is clamped on the inner and outer sides of the girth to improve the welding efficiency; The butt joint device comprises a four-fluorine straight cylinder lifting assembly and an arc-shaped head supporting assembly; the four-fluorine straight cylinder lifting assembly comprises a supporting frame and a plurality of lifting devices; each lifting device is arranged on the upper portion of the supporting frame and used for suspending the four-fluorine straight cylinder; the arc-shaped head supporting assembly is arranged below the lifting devices and used for fixing the arc-shaped head; the plurality of lifting devices jointly lift the four-fluorine straight cylinder, so that the four-fluorine straight cylinder and the arc-shaped head are butted and fixed; the lifting height of each lifting device is adjusted to make the butt joint distance of the lower edge of the four-fluorine straight cylinder and the upper edge of the arc-shaped head equal. The girth welding device comprises a frame body, an outer welding cutter and an inner welding cutter; the frame body is in the shape of U; the frame body comprises a left supporting arm and a right supporting arm; the outer welding cutter is arranged on the left supporting arm; the inner welding cutter is arranged on the right supporting arm; the outer welding cutter and the inner welding cutter are arranged on the left supporting arm and the right supporting arm in a distance-adjustable mode; the outer welding cutter and the inner welding cutter are at the same height, so that the outer welding cutter and the inner welding cutter can be close to each other to clamp and weld the girth of the four-fluorine straight cylinder and the arc-shaped head. The lifting device comprises a truss and an electric hoist; the electric hoist is arranged on the truss and can move along the length direction and the width direction of the truss; the truss and the electric hoist are located above the four-fluorine straight cylinder lifting assembly; a lifting hook is arranged on the electric hoist and used for suspending the frame body of the girth welding device; the lifted girth welding device can make the left supporting arm and the right supporting arm respectively located on the inner and outer sides of the four-fluorine straight cylinder, so that the outer welding cutter arranged on the left supporting arm and the inner welding cutter arranged on the right supporting arm respectively reach the inner and outer sides of the girth along the two sides of the four-fluorine straight cylinder.

2. The production system for assembling the four-fluoride straight cylinder and arc-shaped head as claimed in claim 1, wherein, The supporting frame comprises a frame and a plurality of supporting columns; the frame is arranged on the upper end of each supporting column; a plurality of hangers are arranged on the lower side of the frame; the number of the hangers is consistent with the number of the lifting devices; each lifting device is arranged on a hanger; the lifting device is a chain hoist, which comprises a fixed hook, a lifting hook, a lifting chain, a manual chain, a housing and a clamping piece; the lower end of the fixed hook is arranged on the housing; the upper end of the fixed hook is hung on the hanger; the lifting chain is arranged on a driven sprocket in the housing; the lifting hook is arranged on one end of the lifting chain; the manual chain is arranged on a driving sprocket in the housing; the manual chain drives the driving sprocket in the housing to rotate, so that the driven sprocket in the housing is driven to rotate; the driven sprocket drives the lifting hook on one end of the lifting chain to complete lifting or lowering; the clamping piece is arranged on the lifting hook and used for clamping the upper edge of the four-fluorine straight cylinder.

3. The production system for assembling the four-fluoride straight cylinder and arc-shaped head as claimed in claim 2, wherein, The clamping piece comprises a hanging ring, a U-shaped part and a jackscrew, the hanging ring is arranged at the top end of the U-shaped part, a first threaded hole is arranged on one side wall of the U-shaped part, the jackscrew is installed in the first threaded hole, the hanging ring and the lifting hook are hooked with each other, the front end of the jackscrew and the U-shaped part are close to each other, and the upper edge of the fluorine-free straight cylinder is clamped; the hanging piece is semicircular, an opening is arranged on the hanging piece, the hook is inserted into the opening, and the lifting tool is hung on the hanging piece; a reinforcing support is arranged between the frame and the support column, one end of the reinforcing support is arranged on the support column, and the other end of the reinforcing support is arranged on the frame.

4. The production system for assembling the four-fluoride straight cylinder and arc-shaped head as claimed in claim 3, wherein, The arc-shaped head support assembly is located below the plurality of lifting hooks; the arc-shaped head support assembly comprises an arc-shaped head support base, and the arc-shaped head support base is internally provided with a hollow arc-shaped cavity; the spacing between adjacent lifting hooks is equal, and the central axis of the hollow arc-shaped cavity and the central axis of the space formed by the plurality of lifting hooks coincide with each other.

5. The production system for assembling the four-fluoride straight cylinder and arc-shaped head as claimed in claim 1, wherein, The lengths of the left support arm and the right support arm are equal, the outer welding cutter is arranged at the lower end of the left support arm, and the inner welding cutter is arranged at the lower end of the right support arm; a second threaded hole is arranged at the lower end of the left support arm, and a threaded rod is installed in the second threaded hole; a fixed column is arranged at the lower end of the right support arm; the central axis of the threaded rod and the central axis of the fixed column coincide; a first fixed hole is arranged on the arc-shaped outer side wall of the outer welding cutter, the front end of the threaded rod is inserted into the first fixed hole, a second fixed hole is arranged on the arc-shaped inner side wall of the inner welding cutter, and the front end of the fixed column is inserted into the second fixed hole; the threaded rod is rotated to push the outer welding cutter close to the inner welding cutter, thereby gradually clamping and welding the girth joint between the fluorine-free straight cylinder and the arc-shaped head.

6. The production system for assembling the four-fluoride straight cylinder and arc-shaped head as claimed in claim 5, wherein, A fixed seat is arranged on the lower end surface of the left support arm, a third threaded hole is arranged on the fixed seat, a threaded rod is installed in the third threaded hole, one end of the threaded rod is provided with a rotating handle, and the rotating handle and the outer welding cutter are located on the two sides of the fixed seat, respectively; a support part is arranged at the lower end of the right support arm, the support part is a channel steel, the support part is arranged on the side wall of the right support arm, one side of the support part close to the left support arm is arranged, and the fixed column is arranged on the support part, and the lower end of the fixed column close to the support part is arranged.

7. The production system for assembling the four-fluoride straight cylinder and arc-shaped head as claimed in claim 6, wherein, A hoisting part is arranged at the middle position of the top of the frame body, a through hole is arranged at the middle position of the hoisting part, the through hole is used in combination with the lifting hook of the electric hoist to hoist the girth joint welding device; a plurality of stepping rods are arranged on the right support arm, the plurality of stepping rods are arranged in a row on the side wall of the right support arm, each stepping rod is arranged opposite to the inner welding cutter on the circumferential wall of the right support arm; a first arc-shaped extension part is arranged on each side of the inner welding cutter, the center of the first arc-shaped extension part coincides with the center of the arc on the outer side wall of the inner welding cutter; a second arc-shaped extension part is arranged on each side of the outer welding cutter, the center of the second arc-shaped extension part coincides with the center of the arc on the inner side wall of the outer welding cutter; a first handle is arranged on the upper side wall of the outer welding cutter, and a second handle is arranged on the upper side wall of the inner welding cutter.

8. A production method of assembling a four-fluorine straight cylinder and an arc-shaped head, the method being applied to the production system of assembling the four-fluorine straight cylinder and the arc-shaped head according to any one of claims 1 to 7, characterized in that, The production method comprises the following steps: S1, fixing of the arc-shaped head: placing the arc-shaped head in the arc-shaped head support assembly, adjusting the arc-shaped head so that the upper end of the arc-shaped head is in a horizontal state, and then adding fine sand into the arc-shaped head to fix the arc-shaped head in the arc-shaped head support assembly by the gravity of the fine sand, wherein the upper end of the fixed arc-shaped head is in a horizontal state; S1, fixing of the arc-shaped head: placing the arc-shaped head in the arc-shaped head support assembly, adjusting the arc-shaped head so that the upper end of the arc-shaped head is in a horizontal state, and then adding fine sand into the arc-shaped head to fix the arc-shaped head in the arc-shaped head support assembly by the gravity of the fine sand, wherein the upper end of the fixed arc-shaped head is in a horizontal state; S2. After lifting the PTFE straight cylinder, connect it to the arc-shaped head: Use multiple lifting tools to fix them to the upper edge of the PTFE straight cylinder. Adjust the lifting height of each lifting tool so that the lower edge of the PTFE straight cylinder is higher than the upper edge of the fixed arc-shaped head. Then move the arc-shaped head support assembly or the PTFE straight cylinder lifting assembly to align the lower end of the PTFE straight cylinder with the upper end of the arc-shaped head. Adjust each lifting tool again to gradually lower the PTFE straight cylinder and then connect the PTFE straight cylinder and the arc-shaped head. The contact surfaces of the PTFE straight cylinder and the arc-shaped head form an annular seam. Place a PTFE welding rod in the annular seam. The width of the PTFE welding rod should be consistent with the width of the annular seam. The distance between the lower edge of the PTFE straight cylinder and the upper edge of the arc-shaped head is the width of the annular seam. Check whether the width of the annular seam reaches the welding width and ensure that the widths of the annular seams are equal. If the widths of the annular seams are not equal, adjust the corresponding lifting tools to make the widths of the annular seams equal at each point. Once the widths of the annular seams are consistent, maintain them. S3. Use a lifting device to lift and place the circumferential welding device, so that the circumferential welding device is clamped on both sides of the circumferential seam: Use a lifting device to lift the circumferential welding device. After the lower end of the lifted circumferential welding device is higher than the upper end of the PTFE straight cylinder, use the lifting device to move the circumferential welding device horizontally to the top of the side wall of the PTFE straight cylinder. Use the lifting device to gradually lower the circumferential welding device so that the circumferential welding device is clamped on both sides of the side wall of the PTFE straight cylinder. Use the lifting device to continue to lower the circumferential welding device until the inner and outer welding blades of the circumferential welding device are clamped on the inner and outer sides of the circumferential seam for welding. S4. Adjust the lifting device to lift the circumferential welding device and rotate it intermittently around the circumferential seam to heat and weld a section of the circumferential seam. After completing the welding of the entire circumferential seam, remove the circumferential welding device from the PTFE cylinder. S5. After the welded circumferential seam has cooled naturally, trim the edges of the seam, remove the fine sand, and clean it.

9. The method of claim 8, wherein the method further comprises the step of: During the "fixing of the arc-shaped head" process, fine sand is first laid at the bottom of the arc-shaped head support assembly, and then the arc-shaped head is placed inside the arc-shaped head support assembly. Next, more fine sand is added to the arc-shaped head support assembly to maintain the same thickness of fine sand between the support assembly and the arc-shaped head. This layer of fine sand between the support assembly and the arc-shaped head allows the upper end of the arc-shaped head's opening to extend beyond the support assembly to meet the required docking length. During the "hoisting the PTFE cylinder and docking it with the arc-shaped head" process, a first marking line is first marked on the outer or inner surface of the fixed arc-shaped head. The first marking line and the upper end of the arc-shaped end cap are both perpendicularly equal; a second marking line also needs to be marked on the outer or inner wall of the PTFE cylinder, and the second marking line and the lower end of the PTFE cylinder are both perpendicularly equal; the perpendicular distance between the first marking line and the upper end of the arc-shaped end cap and the perpendicular distance between the second marking line and the lower end of the PTFE cylinder are equal; during the docking process of the PTFE cylinder and the arc-shaped end cap, the docking is completed after the lower end of the PTFE cylinder and the first marking line coincide with each other; or during the docking process of the PTFE cylinder and the arc-shaped end cap, the docking is completed after the upper end of the arc-shaped end cap and the second marking line coincide with each other.

10. The method of claim 8, wherein the method further comprises the step of: In the process of lifting and placing the girth welding device by the lifting device, so that the girth welding device is clamped on both sides of the girth, one operator stands in the arc-shaped head covered with fine sand to operate the inner welding knife, and the upper end surface of the inner welding knife is horizontal; another operator stands outside the girth to operate the outer welding knife, and the upper end surface of the outer welding knife is horizontal; in the process of adjusting the lifting device to hoist the girth welding device to intermittently rotate around the girth to heat and weld a section of the girth, the girth clamped by the last inner welding knife and the outer welding knife overlaps the girth clamped by the previous inner welding knife and the outer welding knife by 1-2 cm, so as to prevent the situation that a section of the girth is not connected, which leads to the fact that the sealing performance cannot meet the standard.

Images