A mold changing tool and mold changing method for high frequency welded pipe production

Abstract

The present invention provides a mold changing tool for high-frequency welded pipe production, including a mold rack, a shoulder pole mold rack hoisting tool, a torque flat roller mold loading and unloading tool, and a shoulder pole vertical roller mold loading and unloading tool. The mold rack includes a stacked sizing section vertical roller mold rack, a sizing section flat roller mold rack, a forming section vertical roller mold rack, and a forming section flat roller mold rack. The shoulder pole mold rack hoisting tool is used to hoist the mold rack out of the warehouse and into the warehouse. The torque flat roller mold loading and unloading tool is used to put the forming section flat roller mold and the sizing section flat roller mold into and off the rack. The shoulder pole vertical roller mold loading and unloading tool is used to put the forming section vertical roller mold and the sizing section vertical roller mold into and off the rack. The present invention also provides a mold changing method for high-frequency welded pipe production. The mold changing tool and mold changing method for high-frequency welded pipe production of the present invention can quickly dock the loading and unloading positions and load and unload multiple molds at one time.

Description

Technical Field

[0001] The invention relates to the technical field of steel pipe processing, and in particular to a die changing tool and a die changing method for high-frequency welded pipe production. Background Art

[0002] Before the current high-frequency welded pipe production line is changed, the entire mold rack will be moved to the side of the production line by a crane. Since the pipe-making mold has a central hole shape, so that the central hole of the mold can be installed in the shaft core of the pipe-making unit, the current mold rack is mostly in the form of a simple vertical ground rod structure as an open rack, or the mold is directly placed in a box for stacking. Whether the mold is disassembled or assembled, it is mostly carried out by manual transportation. Since a single pipe-making mold can weigh tens of kilograms or hundreds of kilograms, the mold change operation not only causes a waste of mold change time and cost for multiple people to carry, but also often causes work-related injuries caused by molds falling and hitting people. There are serious hidden dangers of occupational diseases and injuries to operators in the long term. The current high-frequency welded pipe mold change requires a new process with new tools for improvement. In addition, the pipe-making mold is divided into a forming section mold and a sizing section mold. The distance between the forming and sizing sections is as high as 40 meters to 300 meters, and each section is divided into a flat roller mold and a vertical roller mold. Therefore, it is necessary to achieve synchronous mold change in each section to save the mold change time to the maximum benefit. Summary of the invention

[0003] In view of the above technical problems, the present invention provides a mold changing tool and a mold changing method for high-frequency welded pipe production, which can quickly connect the loading and unloading positions and load and unload multiple molds at one time.

[0004] To achieve the above object, the present invention adopts the following technical solution:

[0005] A mold changing tool for high-frequency welded pipe production includes a mold rack, a shoulder pole mold rack hoisting tool, a torque flat roller mold loading and unloading tool, and a shoulder pole vertical roller mold loading and unloading tool. The mold rack includes a sizing section vertical roller mold rack, a sizing section flat roller mold rack, a forming section vertical roller mold rack, and a forming section flat roller mold rack stacked in layers. The shoulder pole mold rack hoisting tool is used to hoist the mold rack out of and into storage. The torque flat roller mold loading and unloading tool is used to put the forming section flat roller mold and the sizing section flat roller mold into and off the rack. The shoulder pole vertical roller mold loading and unloading tool is used to put the forming section vertical roller mold and the sizing section vertical roller mold into and off the rack.

[0006] Furthermore, the sizing section vertical roller mold frame, the sizing section flat roller mold frame, the forming section vertical roller mold frame and the forming section flat roller mold frame are stacked in sequence from top to bottom.

[0007] Furthermore, the forming section flat roller mold frame and the sizing section flat roller mold frame both include a stacking frame, which includes a base frame, two side frames and a middle placement frame. The middle placement frame is located between the two side frames, with both ends fixedly connected to the two side frames and the lower part fixedly connected to the base frame. A plurality of flat roller mold placement rods are arranged at intervals on both sides of the middle support frame, and the flat roller mold placement rods on both sides are staggered. The side frames are brackets surrounded by four C-shaped groove rods, and the notches of the C-shaped groove rods face outward. Two hooks are symmetrically arranged at both ends of the upper horizontal C-shaped groove rod, and the two hooks are located in the C-shaped groove.

[0008] Furthermore, an integrally formed truncated cone is coaxially provided at the front end of the flat roller mold placing rod, and the diameter of the truncated cone is smaller than the diameter of the flat roller mold placing rod; an anti-dropping baffle rod is provided between the two vertical C-shaped slot rods of the side frames, and slots are symmetrically provided on the two opposite vertical C-shaped slot rods, and both ends of the anti-dropping baffle rod are inserted into the slots.

[0009] Furthermore, the forming section vertical roller mold frame and the sizing section vertical roller mold frame both include a stacking frame, and the stacking frame includes two side frames arranged in mirror symmetry, and the side frames are brackets surrounded by four C-shaped groove rods, and the notches of the C-shaped groove rods face outward, and two hooks are symmetrically provided at both ends of the upper horizontal C-shaped groove rod, and the two hooks are located in the C-shaped groove; two bottom rods are symmetrically provided between the two side frames, and the two ends of the two bottom rods are fixedly connected to the bottom horizontal C-shaped groove rod of the side frame, and a plurality of columns for placing the vertical roller molds are spaced apart on the two bottom rods; a partition rod is connected between the upper horizontal C-shaped groove rods of the two side frames.

[0010] Furthermore, two clamping blocks are symmetrically provided at both ends of the upper end surface of the transverse C-shaped slot rod on the upper part of the side frame, and the clamping blocks are respectively clamped with the C-shaped slots of the vertical C-shaped slot rods of the side frame stacked on the upper part.

[0011] Furthermore, the shoulder pole type mold rack lifting tooling includes a mold rack hanging rod and a mold rack hanging chain arranged at both ends of the mold rack hanging rod, two mold rack lifting hangers are symmetrically arranged at both ends of the upper end surface of the mold rack hanging rod, and two mold rack hanging chain threading rings are symmetrically arranged at both ends of the lower end surface of the mold rack hanging rod, and mold rack hooks are connected to both ends of the mold rack hanging chain, and the mold rack hooks are respectively connected to the hooks.

[0012] Furthermore, the torque-type flat roller mold loading and unloading tooling includes a torque hanger and a T-shaped anti-drop pin, the torque hanger includes a first vertical portion at the top and a second vertical portion at the bottom, the first vertical portion and the second vertical portion are staggered and arranged in parallel, an oblique portion is connected between the lower end of the first vertical portion and the upper end of the second vertical portion, a mold support rod is vertically provided on the inner side surface of the lower end of the second vertical portion, the mold support rod is a hollow structure, and two sockets are relatively provided on the upper and lower end surfaces of the front end of the mold support rod. When disassembling and installing the flat roller mold, the flat roller axis is inserted in the mold support rod, and the T-shaped anti-drop pin is inserted in the two sockets.

[0013] Furthermore, the shoulder pole type vertical roller mold loading and unloading tooling includes a vertical roller mold hanging rod and a vertical roller mold hanging chain arranged at both ends of the vertical roller mold hanging rod, two vertical roller mold lifting hangers are symmetrically arranged at both ends of the upper end surface of the vertical roller mold hanging rod, and two vertical roller mold hanging chain threading rings are symmetrically arranged at both ends of the lower end surface of the vertical roller mold hanging rod, and threaded loading and unloading locks are connected to both ends of the vertical roller mold hanging chain. Two screw holes are arranged on the upper end surface of the vertical roller mold, and the two screw holes are arranged opposite to the axial hole of the vertical roller mold. When disassembling and installing the vertical roller mold, the two threaded loading and unloading locks are respectively screwed with the screw holes.

[0014] The die changing method using the die changing tooling for high-frequency welded pipe production includes a die disassembly process and a die assembly process, wherein the die disassembly process includes the following steps:

[0015] S1, empty mold rack out of the warehouse and split and transport: the stacked forming section flat roller mold rack, forming section vertical roller mold rack, sizing section flat roller mold rack and sizing section vertical roller mold rack are hoisted out of the warehouse at one time; then the shoulder pole type mold rack hoisting tool is used to transport the lower two layers to the forming section and the upper two layers to the sizing section in turn;

[0016] S2, unloading and transporting the flat roller and vertical roller of the forming section: Use the torque-type flat roller mold loading and unloading tooling to unload the flat roller mold of the forming section and the sizing section from the unit, insert the anti-drop pin before hoisting to the mold rack, pull out the anti-drop pin when transporting to the mold rack, then insert the stepped structure at the front end of the flat roller mold placement rod into the shaft hole of the flat roller mold, push the flat roller mold completely onto the flat roller mold placement rod, and finally install the anti-drop blocking rod;

[0017] S3, vertical roller mold unloading and transportation: Use the shoulder pole type vertical roller mold loading and unloading tooling to unload the vertical roller molds of the forming section and the sizing section from the unit, and then place them on the columns of the corresponding mold racks, and finally remove the threaded loading and unloading locks;

[0018] S4, the mold rack is put into the warehouse: after all the molds of the forming section and the sizing section are loaded into the mold rack, the forming section flat roller mold rack and the forming section vertical roller mold rack are stacked at the forming section respectively; at the sizing section, the sizing section flat roller mold rack and the sizing section vertical roller mold rack are stacked, and after all four layers of mold racks are stacked, the whole set of mold racks is put into the warehouse using the shoulder pole type mold rack hoisting tool;

[0019] The mold assembly process includes the following steps:

[0020] S5, mold rack out of the warehouse and splitting and transporting: Use the pole-type mold rack hoisting tooling to transport the entire set of fully loaded mold racks out of the warehouse, and then split the sizing section flat roller mold rack and sizing section vertical roller mold rack, as well as the forming section flat roller mold rack and forming section vertical roller mold rack to the sizing section and the forming section respectively;

[0021] S6, mold removal:

[0022] S61. Remove the flat roller mold from the mold stand: first remove the anti-dropping baffle rod, use the torque flat roller mold loading and unloading tool to remove the flat roller mold of the forming section and the sizing section from the mold stand, and then assemble the flat roller mold onto the flat roller axis;

[0023] S62, the vertical roller mold is taken out from the mold frame: first, the vertical roller mold is locked with the threaded loading and unloading lock, and then the mold is lifted. Then, the vertical roller mold of the forming section and the sizing section is taken out from the mold frame by using the shoulder pole type vertical roller mold loading and unloading tooling, and the vertical roller mold is lifted onto the corresponding vertical roller shaft core, and finally the threaded loading and unloading lock is removed.

[0024] S7, empty mold racks are put into storage: After the forming section and sizing section molds are assembled into the unit, the empty forming section flat roller mold racks and forming section vertical roller mold racks are stacked at the forming section; at the sizing section, the empty sizing section flat roller mold racks and sizing section vertical roller mold racks are stacked, and then all four layers of empty mold racks are stacked and the whole set of mold racks are put into storage using a shoulder pole type mold rack lifting tool.

[0025] The mold changing tooling for high-frequency welded pipe production of the present invention can quickly dock the loading and unloading positions and load and unload multiple molds at one time. In order to achieve the visibility, safety and storage of the mold rack, the mold pass number is marked on the mold rack. After a row of molds are loaded, an anti-drop structure is designed to improve the risk of molds falling and injuring people. Each mold rack can be split into the forming section and the sizing section line edge according to the synchronous operation requirements, and the flat roller and vertical roller mold changing operations can be carried out at the same time. Two types of carriers are used throughout the process, and no manual handling is required, which improves the loading and unloading and transportation problems of pipe-making molds that are as light as tens of kilograms and as heavy as hundreds of kilograms. Considering that the storage of a large number of pipe-making molds must take into account both space-saving and storage, it is proposed to use a stable square main mold rack, split into several mold racks in the form of sections and rollers, and design the docking and lifting dimensions between the mold racks in a consistent manner. The safe and convenient hook-shaped structure is used for lifting, and the entire set of four mold racks can be quickly lifted in and out of the warehouse. Because of the four-layer stacking and the square and stable design of the chassis, not only is there visibility between each rack, but also safety and storage are taken into account.

[0026] By adopting the mold changing method of the present invention, synchronous operation can be achieved in both the disassembly process and the assembly process, which saves working time and ensures the safety of personnel. The disassembly process and the assembly process both use the mold rack and the carrier designed in the same set of the present invention. The hardware has high reusability and low cost. Most of the mold storage locations correspond to fixed high-frequency pipe making lines. Even after a single high-frequency pipe making product project is terminated, since the present invention proposes that the size parameters of the mold rack and the carrier are designed according to the parameters of the unit, the process standards, mold racks and carriers can be fully used.

[0027] The design proposed by the present invention has taken into account a wide range of high-frequency pipe welding die change processes and hardware requirements. Therefore, it can be used universally regardless of the size of the high-frequency pipe welding unit and the specifications and dimensions. Not only is the hardware investment cost low and will not be replaced after long-term use, but it also has die change efficiency and storage space. Most importantly, it protects the occupational safety of employees and the property safety of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of a fully loaded mold frame of a mold changing tooling for high-frequency welded pipe production according to the present invention;

[0029] Figure 2 It is a schematic diagram of the overall structure of the mold frame of the mold changing tooling for high-frequency welded pipe production according to the present invention;

[0030] Figure 3 It is a schematic diagram of hoisting and installing the empty forming section flat roller mold frame and the forming section vertical roller mold frame during the mold disassembly process of the present invention;

[0031] Figure 4 It is a schematic diagram of hoisting an empty sizing section flat roller mold frame and a sizing section vertical roller mold frame during the mold disassembly process of the present invention;

[0032] Figure 5 The state of disassembling the flat roller mold during the mold disassembly process of the present invention Figure 1 ;

[0033] Figure 6 The state of disassembling the flat roller mold during the mold disassembly process of the present invention Figure 2 ;

[0034] Figure 7 This is a state diagram of disassembling the vertical roller mold during the mold disassembly process of the present invention;

[0035] Figure 8 It is a schematic diagram of loading the flat roller mold into the mold frame during the mold disassembly process of the present invention;

[0036] Fig. 9 It is a schematic diagram of loading the vertical roller mold into the mold frame during the mold disassembly process of the present invention;

[0037] Fig.10 It is a schematic diagram of the structure of the shoulder pole type vertical roller mold loading and unloading tooling of the present invention.

[0038] Among them, 1-1-sizing section vertical roller mold frame, 1-2-sizing section flat roller mold frame, 1-3-forming section vertical roller mold frame, 1-4-forming section flat roller mold frame, 2-pole type mold frame lifting tooling, 3-torque flat roller mold loading and unloading tooling, 4-pole type vertical roller mold loading and unloading tooling, 11-stacking rack, 111-bottom frame, 112-side frame, 113-middle placement rack, 114-flat roller mold placement rod, 1121-C-shaped groove rod, 115-hook, 116-anti-drop baffle rod, 117-slot, 118-bottom rod, 119-column, 120-partition baffle rod, 121-block, 21-mold frame hanging rod, 22-mold frame lifting chain, 23-mold frame lifting pendant, 24-mold frame lifting chain threading ring, 25-mold frame hook,

[0039] 31-torque suspension rod, 32-T-type anti-drop pin, 311-first vertical part, 312-second vertical part, 313-oblique part, 314-mold support rod, 315-jack, 41-vertical roller mold suspension rod, 42-vertical roller mold lifting chain, 43-vertical roller mold lifting pendant, 44-vertical roller mold lifting chain threading ring, 45-threaded loading and unloading lock, 5-flat roller mold, 6-vertical roller mold, 61-screw hole, 7-flat roller axis, 8-vertical roller axis, 9-mold nameplate. DETAILED DESCRIPTION

[0040] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0041] like Figure 1-9As shown, a mold changing tool for high-frequency welded pipe production includes a mold rack, a shoulder pole mold rack hoisting tool 2, a torque flat roller mold loading and unloading tool 3 and a shoulder pole vertical roller mold loading and unloading tool 4. The mold rack includes a sizing section vertical roller mold rack 1-1, a sizing section flat roller mold rack 1-2, a forming section vertical roller mold rack 1-3 and a forming section flat roller mold rack 1-4 stacked in sequence from top to bottom. The shoulder pole mold rack hoisting tool 2 is used to hoist the mold rack out of and into the warehouse, the torque flat roller mold loading and unloading tool 3 is used to put the forming section flat roller mold and the sizing section flat roller mold into and off the rack, and the shoulder pole vertical roller mold loading and unloading tool 4 is used to put the forming section vertical roller mold and the sizing section vertical roller mold into and off the rack.

[0042] The forming section flat roller mold frame 1-3 and the sizing section flat roller mold frame 1-2 both include a stacking frame 11, and the stacking frame 11 includes a bottom frame 111, two side frames 112 and a middle placement frame 113. The middle placement frame 113 is located between the two side frames 112, and its two ends are fixedly connected to the two side frames 112, and its lower part is fixedly connected to the bottom frame 111. A plurality of flat roller mold placement rods 114 are arranged at intervals on both sides of the middle support frame 113, and the flat roller mold placement rods 114 on both sides are staggered. The side frame 112 is a bracket surrounded by four C-shaped groove rods 1121. The C The notch of the groove rod 1121 faces outward, and two hooks 115 are symmetrically provided at both ends of the upper horizontal C-shaped groove rod 1121, and the two hooks 115 are located in the C-shaped groove; the front end of the flat roller mold placing rod 114 is coaxially provided with an integrally formed frustum, and the diameter of the frustum is smaller than the diameter of the flat roller mold placing rod; an anti-drop baffle rod 116 is provided between the vertical C-shaped groove rods 1121 of the two side frames 112, and slots 117 are symmetrically provided on the two opposite vertical C-shaped groove rods 1121, and the two ends of the anti-drop baffle rod 116 are inserted into the slots 117.

[0043] The forming section vertical roller mold frame 1-3 and the sizing section vertical roller mold frame 1-1 both include a stacking frame 11, and the stacking frame 11 includes two side frames 112 arranged in mirror symmetry. The side frame 112 is a bracket surrounded by four C-shaped groove rods 1121, and the notches of the C-shaped groove rods 1121 face outward. Two hooks 115 are symmetrically arranged at both ends of the upper horizontal C-shaped groove rod 1121, and the two hooks 115 are located in the C-shaped groove; two bottom rods 118 are symmetrically arranged between the two side frames 112, and the two ends of the two bottom rods 118 are fixedly connected to the bottom horizontal C-shaped groove rod 1121 of the side frame 112, and a plurality of columns 119 for placing vertical roller molds are arranged at intervals on the two bottom rods 118; a barrier rod 120 is connected between the upper horizontal C-shaped groove rods 1121 of the two side frames 112.

[0044] Two clamping blocks 121 are symmetrically provided at both ends of the upper end surface of the transverse C-shaped groove rod 1121 on the upper part of the side frame 112 of the sizing section vertical roller mold frame 1-1, the sizing section flat roller mold frame 1-2, the forming section vertical roller mold frame 1-3 and the forming section flat roller mold frame 1-4, and the clamping blocks 121 are respectively clamped with the C-shaped grooves of the vertical C-shaped groove rod 112 of the side frame 112 stacked thereon.

[0045] The shoulder pole type mold frame lifting tool 2 includes a mold frame hanging rod 21 and a mold frame hanging chain 22 arranged at both ends of the mold frame hanging rod 21, two mold frame lifting hangers 23 are symmetrically arranged at both ends of the upper end surface of the mold frame hanging rod 21, and two mold frame hanging chain threading rings 24 are symmetrically arranged at both ends of the lower end surface of the mold frame hanging rod 21. Mold frame hooks 25 are connected to both ends of the mold frame hanging chain 22, and the mold frame hooks 25 are respectively connected to the hooks 115.

[0046] The torque type flat roller mold loading and unloading tooling 3 includes a torque suspension rod 31 and a T-shaped anti-drop pin 32. The torque suspension rod 31 includes a first vertical portion 311 at the top and a second vertical portion 312 at the bottom. The first vertical portion 311 and the second vertical portion 312 are staggered and arranged in parallel. An oblique portion 313 is connected between the lower end of the first vertical portion 311 and the upper end of the second vertical portion 312. A mold support rod 314 is vertically provided on the inner side surface of the lower end of the second vertical portion 312. The mold support rod 314 is a hollow structure. Two insertion holes 315 are relatively provided on the upper and lower end surfaces of the front end of the mold support rod 314. When disassembling and installing the flat roller mold, the flat roller axis is inserted in the mold support rod 314, and the T-shaped anti-drop pin 32 is inserted in the two insertion holes 315.

[0047] The shoulder pole type vertical roller mold loading and unloading tooling 4 includes a vertical roller mold hanging rod 41 and a vertical roller mold hanging chain 42 arranged at both ends of the vertical roller mold hanging rod 41, two vertical roller mold lifting hangers 43 are symmetrically arranged at both ends of the upper end surface of the vertical roller mold hanging rod 41, and two vertical roller mold hanging chain passing rings 44 are symmetrically arranged at both ends of the lower end surface of the vertical roller mold hanging rod 41. Threaded loading and unloading locks 45 are connected to both ends of the vertical roller mold hanging chain 42, and two screw holes 61 are arranged on the upper end surface of the vertical roller mold 6. The two screw holes 61 are arranged opposite to the axial hole of the vertical roller mold 6. When disassembling and installing the vertical roller mold 6, the two threaded loading and unloading locks 45 are respectively screwed with the screw holes 61.

[0048] The die changing method using the die changing tooling for high-frequency welded pipe production includes a die disassembly process and a die assembly process, wherein the die disassembly process includes the following steps:

[0049] S1, empty mold racks are removed from the warehouse and split for transportation: the stacked forming section flat roller mold racks 1-3, forming section vertical roller mold racks 1-4, sizing section flat roller mold racks 1-2 and sizing section vertical roller mold racks 1-1 are hoisted out of the warehouse at once; then the lower two layers are transported to the forming section and the upper two layers are transported to the sizing section in sequence by using the pole-type mold rack hoisting tool 2;

[0050] S2, unloading and transporting the flat roller and vertical roller of the forming section: using the torque type flat roller mold loading and unloading tool 3 to unload the flat roller mold 5 of the forming section and the sizing section from the unit, insert the anti-dropping pin 32 before hoisting to the mold rack, pull out the anti-dropping pin 32 when transporting to the mold rack, then insert the stepped structure at the front end of the flat roller mold placement rod 114 into the shaft hole of the flat roller mold, push the flat roller mold 5 completely onto the flat roller mold placement rod 114, and finally install the anti-dropping blocking rod 116;

[0051] S3, vertical roller mold unloading and transportation: Use the shoulder pole type vertical roller mold loading and unloading tool 4 to unload the vertical roller mold 6 of the forming section and the sizing section from the unit, and then place it on the column 119 of the corresponding mold rack, and finally remove the threaded loading and unloading lock 45;

[0052] S4, the mold racks are stored in the warehouse: after all the molds of the forming section and the sizing section are loaded into the mold racks, the forming section flat roller mold racks 1-3 and the forming section vertical roller mold racks 1-4 are stacked at the forming section respectively; at the sizing section, the sizing section flat roller mold racks 1-2 and the sizing section vertical roller mold racks 1-1 are stacked, and after all four layers of mold racks are stacked, the whole set of mold racks is stored in the warehouse using the shoulder pole type mold rack hoisting tool 2;

[0053] The mold assembly process includes the following steps:

[0054] S5, mold rack out of the warehouse and splitting and transporting: use the shoulder pole mold rack hoisting tool 2 to transport the whole set of fully loaded mold racks out of the warehouse, and then split the sizing section flat roller mold rack 1-2 and the sizing section vertical roller mold rack 1-1, as well as the forming section flat roller mold rack 1-3 and the forming section vertical roller mold rack 1-4 to the sizing section and the forming section respectively;

[0055] S6, mold removal:

[0056] S61. The flat roller mold 5 is removed from the mold frame: first, the anti-dropping baffle 116 is removed, and the flat roller mold 5 of the forming section and the sizing section is removed from the mold frame by using the torque flat roller mold loading and unloading tool 3, and then the flat roller mold 5 is assembled to the flat roller axis 7;

[0057] S62, the vertical roller mold 6 is taken out from the mold frame: first, the vertical roller mold and the threaded loading and unloading lock 45 are locked, and then the mold is lifted, and then the vertical roller mold 6 of the forming section and the sizing section is taken out from the mold frame and lifted onto the corresponding vertical roller shaft core 8 by using the shoulder pole type vertical roller mold loading and unloading tool 4, and finally the threaded loading and unloading lock 45 is removed;

[0058] S7, empty mold racks are stored in the warehouse: After the forming section and sizing section molds are assembled into the unit, the empty forming section flat roller mold rack 1-2 and the forming section vertical roller mold rack 1-1 are stacked at the forming section; at the sizing section, the empty sizing section flat roller mold rack 1-3 and the sizing section vertical roller mold rack 1-4 are stacked, and then all four layers of empty mold racks are stacked and the whole set of mold racks are stored in the warehouse using a shoulder pole type mold rack lifting tool.

[0059] The moment type flat roller mold loading and unloading tooling is designed with a hollow structure and can be directly inserted into the flat roller axis 7 of the assembly. It is only necessary to pull the flat roller mold 5 into the moment type flat roller mold loading and unloading tooling. When the moment type flat roller mold loading and unloading tooling is pulled out of the flat roller axis, the moment type flat roller mold loading and unloading tooling is designed with a backward moment center of gravity; the moment type flat roller mold loading and unloading tooling is designed with a moment type flat roller mold loading and unloading anti-drop pin, making the transportation process safer.

[0060] When the vertical roller is unloading and transported, when the vertical roller mold of the forming section (same as the sizing section) is unloaded from the unit, the shoulder pole vertical roller mold loading and unloading tooling is based on the design size of the unit. The lifting of two or more molds can be carried out simultaneously at one time. The shoulder pole vertical roller mold threaded loading and unloading lock under the shoulder pole vertical roller mold loading and unloading tooling can be screwed into the vertical roller mold thread. Several molds can be lifted at one time. The lifting quantity can be designed according to demand, which further improves the unloading efficiency and solves the problem of manual handling.

[0061] The flat roller mold rack is designed with a forming section flat roller mold anti-drop structure. The risk of the mold falling can be prevented by placing the forming section flat roller mold rack anti-drop baffle rod into the structure.

[0062] When the vertical roller mold is loaded into the mold rack, when the forming section (same as the sizing section) vertical roller mold is loaded into the mold rack, the forming section vertical roller mold rack is designed with the same spacing dimensions as the shoulder pole type vertical roller mold loading and unloading tooling. It is only necessary to place the vertical roller mold into the placement structure according to the forming section vertical roller mold label, and remove the shoulder pole type vertical roller mold threaded loading and unloading lock. Because the vertical roller mold placement structure is designed as a vertical structure, there is no risk of tipping out when the center of gravity is downward when the mold is placed. The number of molds to be unloaded at one time can be designed for two or more molds, which further improves the efficiency of mold mounting and solves the problem of manual handling.

[0063] When the flat roller mold is transported and molded, when the flat roller mold of the forming section (same as the sizing section) is pulled out of the mold frame, because the torque type flat roller mold loading and unloading tool is designed with a hollow structure, the mold can be directly inserted into the axis of the flat roller of the assembly when assembling it. It is only necessary to push the flat roller mold from the torque type flat roller mold loading and unloading tool into the axis of the flat roller of the assembly.

[0064] Those skilled in the art should understand that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A die changing tool for high frequency welded pipe production, characterized in that: It comprises a mold rack, a shoulder pole mold rack hoisting tool, a moment type flat roller mold loading and unloading tool and a shoulder pole type vertical roller mold loading and unloading tool. The mold rack comprises a stacked sizing section vertical roller mold rack, a sizing section flat roller mold rack, a forming section vertical roller mold rack and a forming section flat roller mold rack. The shoulder pole mold rack hoisting tool is used to hoist the mold rack out of the warehouse and into the warehouse. The moment type flat roller mold loading and unloading tool is used to put the forming section flat roller mold and the sizing section flat roller mold into and out of the rack. The shoulder pole type vertical roller mold loading and unloading tool is used to put the forming section vertical roller mold and the sizing section vertical roller mold into and out of the rack. The sizing section vertical roller mold frame, the sizing section flat roller mold frame, the forming section vertical roller mold frame and the forming section flat roller mold frame are stacked in sequence from top to bottom; The forming section flat roller mold frame and the sizing section flat roller mold frame both include a stacking frame, and the stacking frame includes a bottom frame, two side frames and a middle placement frame. The middle placement frame is located between the two side frames, and its two ends are fixedly connected to the two side frames, and its lower part is fixedly connected to the bottom frame. A plurality of flat roller mold placement rods are arranged at intervals on both sides of the middle support frame, and the flat roller mold placement rods on both sides are staggered. The side frames are brackets surrounded by four C-shaped groove rods, and the notches of the C-shaped groove rods face outward. Two hooks are symmetrically arranged at both ends of the upper horizontal C-shaped groove rod, and the two hooks are located in the C-shaped groove; The front end of the flat roller mold placement rod is coaxially provided with an integrally formed truncated cone, the diameter of which is smaller than the diameter of the flat roller mold placement rod; an anti-dropping blocking rod is provided between the two vertical C-shaped groove rods of the side frames, and slots are symmetrically provided on the two opposite vertical C-shaped groove rods, and both ends of the anti-dropping blocking rod are inserted into the slots; The forming section vertical roller mold frame and the sizing section vertical roller mold frame both include a stacking frame, and the stacking frame includes two side frames arranged in mirror symmetry, and the side frames are brackets surrounded by four C-shaped groove bars, and the notches of the C-shaped groove bars face outwards, and two hooks are symmetrically arranged at both ends of the upper transverse C-shaped groove bars, and the two hooks are located in the C-shaped grooves; two bottom bars are symmetrically arranged between the two side frames, and the two ends of the two bottom bars are fixedly connected to the bottom transverse C-shaped groove bars of the side frames, and a plurality of columns for placing vertical roller molds are arranged at intervals on the two bottom bars; a partition bar is connected between the upper transverse C-shaped groove bars of the two side frames; Two clamping blocks are symmetrically provided at both ends of the upper end surface of the transverse C-shaped slot rod at the upper part of the side frame, and the clamping blocks are respectively clamped with the C-shaped slots of the vertical C-shaped slot rods of the side frame stacked on the upper part; The torque-type flat roller mold loading and unloading tooling includes a torque suspension rod and a T-shaped anti-drop pin. The torque suspension rod includes a first vertical portion at the top and a second vertical portion at the bottom. The first vertical portion and the second vertical portion are staggered and arranged in parallel. An oblique portion is connected between the lower end of the first vertical portion and the upper end of the second vertical portion. A mold support rod is vertically provided on the inner side surface of the lower end of the second vertical portion. The mold support rod is a hollow structure. Two insertion holes are relatively provided on the upper and lower end surfaces of the front end of the mold support rod. When disassembling and installing the flat roller mold, the flat roller axis is inserted in the mold support rod, and the T-shaped anti-drop pin is inserted in the two insertion holes.

2. A mold changing tool for high frequency welded pipe production according to claim 1, characterized in that: The shoulder pole type mold rack lifting tooling includes a mold rack hanging rod and a mold rack hanging chain arranged at both ends of the mold rack hanging rod, two mold rack lifting hangers are symmetrically arranged at both ends of the upper end surface of the mold rack hanging rod, and two mold rack hanging chain threading rings are symmetrically arranged at both ends of the lower end surface of the mold rack hanging rod, and mold rack hooks are connected to both ends of the mold rack hanging chain, and the mold rack hooks are respectively connected to the hooks.

3. The mold changing tool for high-frequency welded pipe production according to claim 1 is characterized in that: The shoulder pole type vertical roller mold loading and unloading tooling comprises a vertical roller mold hanging rod and a vertical roller mold hanging chain arranged at both ends of the vertical roller mold hanging rod, two vertical roller mold lifting hangers are symmetrically arranged at both ends of the upper end surface of the vertical roller mold hanging rod, and two vertical roller mold hanging chain threading rings are symmetrically arranged at both ends of the lower end surface of the vertical roller mold hanging rod, and threaded loading and unloading locks are connected to both ends of the vertical roller mold hanging chain. Two screw holes are arranged on the upper end surface of the vertical roller mold, and the two screw holes are arranged opposite to the axial hole of the vertical roller mold. When disassembling and installing the vertical roller mold, the two threaded loading and unloading locks are respectively screwed with the screw holes.

4. A die changing method using the die changing tooling for high frequency welded pipe production according to claim 3, characterized in that: The method comprises a mold disassembly process and a mold assembly process, wherein the mold disassembly process comprises the following steps: S1, empty mold rack out of the warehouse and split and transport: the stacked forming section flat roller mold rack, forming section vertical roller mold rack, sizing section flat roller mold rack and sizing section vertical roller mold rack are hoisted out of the warehouse at one time; then the shoulder pole type mold rack hoisting tooling is used to transport the lower two layers to the forming section and the upper two layers to the sizing section in turn; S2, unloading and transporting the flat roller and vertical roller of the forming section: Use the torque-type flat roller mold loading and unloading tooling to unload the flat roller mold of the forming section and the sizing section from the unit, insert the T-shaped anti-drop pin before hoisting to the mold rack, pull out the T-shaped anti-drop pin when hoisting to the mold rack, and then insert the stepped structure at the front end of the flat roller mold placement rod into the shaft hole of the flat roller mold, push the flat roller mold completely onto the flat roller mold placement rod, and finally install the anti-drop blocking rod; S3, vertical roller mold unloading and transportation: Use the shoulder pole type vertical roller mold loading and unloading tooling to unload the vertical roller molds of the forming section and the sizing section from the unit, and then place them on the columns of the corresponding mold racks, and finally remove the threaded loading and unloading locks; S4, the mold rack is put into the warehouse: after all the molds of the forming section and the sizing section are loaded into the mold rack, the forming section flat roller mold rack and the forming section vertical roller mold rack are stacked at the forming section respectively; at the sizing section, the sizing section flat roller mold rack and the sizing section vertical roller mold rack are stacked, and after all four layers of mold racks are stacked, the whole set of mold racks is put into the warehouse using the shoulder pole type mold rack hoisting tool; The mold assembly process includes the following steps: S5, mold rack out of the warehouse and splitting and transporting: use the shoulder pole mold rack hoisting tooling to transport the whole set of fully loaded mold racks out of the warehouse, and then split the sizing section flat roller mold rack and the sizing section vertical roller mold rack, as well as the forming section flat roller mold rack and the forming section vertical roller mold rack to the sizing section and the forming section respectively; S6, mold removal: S61. Remove the flat roller mold from the mold stand: first remove the anti-dropping baffle rod, use the torque flat roller mold loading and unloading tool to remove the flat roller mold of the forming section and the sizing section from the mold stand, and then assemble the flat roller mold onto the flat roller axis; S62, the vertical roller mold is taken out from the mold frame: first, the vertical roller mold is locked with the threaded loading and unloading lock, and then the mold is lifted. Then, the vertical roller mold of the forming section and the sizing section is taken out from the mold frame by using the shoulder pole type vertical roller mold loading and unloading tooling, and the vertical roller mold is lifted onto the corresponding vertical roller shaft core, and finally the threaded loading and unloading lock is removed. S7, empty mold racks are put into storage: After the forming section and sizing section molds are assembled into the unit, the empty forming section flat roller mold racks and forming section vertical roller mold racks are stacked at the forming section; at the sizing section, the empty sizing section flat roller mold racks and sizing section vertical roller mold racks are stacked, and then all four layers of empty mold racks are stacked and the whole set of mold racks are put into storage using the shoulder pole type mold rack lifting tooling.

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