A quick die changing device and die changing method for roll forming machine

Abstract

The invention relates to the technical field of roll forming, and discloses a rapid die changing device and a die changing method for a roll forming machine; through the arrangement of a die changing mechanism, when replacing a pressure roller, a driving assembly is driven in a forward direction to pull a movable plate away from a driving block, providing a sufficient distance for the pressure roller; during the movement of the movable plate, a driving gear and a driven gear are cooperated to drive a push plate to push down the pressure roller installed on a fixed plate, thereby completing the disassembly of the pressure roller, and then a new pressure roller is aligned with a die changing screw, and the driving assembly is driven in a reverse direction to push the movable plate back to the driving block, and the push plate is retracted, and at the same time, the movable plate pushes the new pressure roller to move in the same direction on the die changing screw, thereby completing the assembly, avoiding large-scale disassembly, saving the time spent on disassembly and assembly, making the replacement of the pressure roller faster, and thus improving work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of roll forming, in particular to a rapid die changing device and a die changing method for a roll forming machine. Background Art

[0002] The forming of steel pipes can be roughly divided into the processes of bending, welding, cutting, grinding, water cooling, sizing and straightening. In the sizing process, a sizing machine in a roll forming machine is needed to perform sizing rolling on the steel pipe to obtain a higher precision external dimension. When using the sizing machine, since its pressure roller is in direct contact with the steel pipe, it is easy to cause the pressure roller to wear. When the wear is more serious, it needs to be replaced. However, the existing sizing machine and the pressure roller thereon are mostly integrated designs. When replacing the pressure roller, the sizing machine needs to be disassembled on a large scale to remove the pressure roller. After replacing it with a new pressure roller, the disassembled sizing machine needs to be assembled again, so that the replacement of the pressure roller takes a lot of time, which affects the work efficiency. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a quick die changing device and a die changing method for a roller forming machine, which have the advantages of avoiding large-scale disassembly, saving the time spent on disassembly and assembly, making the replacement of pressure rollers faster, thereby improving work efficiency, etc., and solves the problem that the existing sizing machine and the pressure rollers thereon are mostly integrated in design, and when replacing the pressure rollers, the sizing machine needs to be disassembled on a large scale to remove the pressure rollers, and after replacing them with new pressure rollers, the disassembled sizing machine is assembled back, so that the replacement of the pressure rollers takes a lot of time, thereby affecting the work efficiency.

[0004] In order to solve the technical problem that the above-mentioned existing sizing machines and the pressure rollers thereon are mostly of integrated design, and when replacing the pressure rollers, the sizing machine needs to be disassembled on a large scale to remove the pressure rollers, and then the disassembled sizing machine needs to be installed back after replacing the pressure rollers, so that the replacement of the pressure rollers takes a lot of time, thereby affecting the work efficiency, the present invention provides the following technical solutions: a quick die changing device for a roller forming machine, comprising a roller die seat, the roller die seat is installed on one end of the roller press, and the other end of the roller press is also provided with a straightening device. When sizing, the steel pipe passes through the roller die seat and the straightening device in turn, and the straightening device pulls the steel pipe through the roller die seat, characterized in that: the roller die seat is provided with a connecting assembly, a roller pressing assembly and a die changing mechanism, and the two connecting assemblies are arranged in the roller die seat in turn from top to bottom, and the connecting assembly includes a driving block, a fixing plate and a movable plate, the driving block being installed on the roller pressing die seat, wherein the driving block located at the upper end of the roller pressing die seat can move vertically, the fixed plate is connected to one side of the driving block, and the movable plate is slidably arranged on the other side of the driving block, the rolling assembly includes a pressure roller, the pressure roller is installed on the fixed plate, and the other side of the pressure roller is connected to the movable plate. When the pressure roller is replaced, the driving block located on the upper side of the roller pressing die seat drives the rolling assembly and the mold changing mechanism thereon to move upward to the replacement position, and the mold changing mechanism includes a push plate and a driving assembly, the push plate is located between the fixed plate and the pressure roller, and the driving assembly cooperates with the movable plate and the push plate. After the driving block on the upper side of the roller pressing die seat moves to the replacement position, the driving assembly drives the movable plate to separate from the pressure roller, and drives the push plate to push the pressure roller to separate from the fixed plate.

[0005] Preferably, the driving block located at the lower end is fixedly connected to the rolling die seat, and a snap-in groove is provided on one side of the driving block, and the snap-in groove corresponds to the movable plate. A guide rod is fixedly connected in the snap-in groove, and the guide rod slides through the movable plate and is slidably connected to the inner wall of the rolling die seat. A vertical slider is also fixedly installed on the other side of the driving block located at the upper end, and a driving groove is provided on one side of the fixed plate, and a mounting seat is fixedly connected to the lower side of one end of the fixed plate facing the straightening device.

[0006] Preferably, a vertical slide groove begins to be provided at the upper end of the rolling die seat, the driving block located at the upper end is installed in the vertical slide groove, a limiting groove is provided on the inner side of the vertical slide groove, the vertical slider is slidably installed in the limiting groove, and sliding grooves are provided at both the upper and lower ends of one side of the rolling die seat, wherein the sliding groove located at the upper end is connected to the top end of the vertical slide groove, the sliding groove corresponds to the movable plate, and the movable plate can slide in the sliding groove.

[0007] Preferably, a groove is formed at the side of the roller die seat, a bearing seat is slidably mounted on the groove, the bearing seat corresponds to the sliding groove, and a steel pipe channel runs through the middle of the roller die seat.

[0008] Preferably, the driving assembly includes a screw rod, a handwheel and a mold-changing screw, one end of the screw rod is rotatably connected to the inner side of the fixed plate and extends into the driving groove, the end of the screw rod located in the driving groove is coaxially fixedly connected with a driving gear, the other end of the screw rod is rotatably mounted on the bearing seat and extends therefrom, the handwheel is coaxially fixedly connected to the extended end of the screw rod and is located on one side of the bearing seat, one end of the mold-changing screw rod is rotatably mounted on the fixed plate, and a driven gear is also coaxially fixedly connected to the end, the driven gear is located on the outer side of the fixed plate, the driven gear is connected to the driving gear through a chain, and the other end of the mold-changing screw rod slides through the movable plate.

[0009] Preferably, the push plate is assembled on the mold changing screw by a thread, and a sliding rod is fixedly connected to one side of the lower end of the push plate. The sliding rod is slidably installed on the mounting seat. When the push plate pushes the pressure roller, it drives the sliding rod to slide on the mounting seat.

[0010] Preferably, the rolling assembly also includes a rotating shaft sleeve, the pressure roller is rotatably mounted on the rotating shaft sleeve, and the rotating shaft sleeve is sleeved on the mold changing screw. When the pressure roller is not replaced, one end of the rotating shaft sleeve abuts against the push plate, and the other end thereof abuts against the movable plate. When the pressure roller is replaced, the push plate pushes the rotating shaft sleeve to move on the mold changing screw.

[0011] Preferably, a fixing cover is provided on one side of the movable plate, the fixing cover is equipped with fixing bolts, and the rotating shaft sleeve is fixedly connected to the movable plate through the fixing bolts.

[0012] Preferably, a connecting seat is fixedly installed on the top of the rolling die seat, and an adjusting threaded rod is threadedly assembled in the connecting seat. One end of the adjusting threaded rod is rotatably connected to the top of the driving block at the upper end, and the top of the adjusting threaded rod is equipped with an adjusting nut.

[0013] Preferably, a mold changing method uses a rapid mold changing device for a roll forming machine.

[0014] Compared with the prior art, the present invention provides a rapid die changing device and die changing method for a roll forming machine, which has the following beneficial effects:

[0015] 1. The rapid die-changing device and die-changing method of the roller forming machine, through the setting of the die-changing mechanism, when replacing the pressure roller, the driving assembly is driven in the forward direction to pull the movable plate away from the driving block to provide a sufficient distance for the pressure roller. During the movement of the movable plate, the driving gear and the driven gear cooperate to drive the push plate to push down the pressure roller installed on the fixed plate, thereby completing the disassembly of the pressure roller, and then the new pressure roller is aligned with the die-changing screw, and the driving assembly is driven in the reverse direction to push the movable plate back to the driving block, and the push plate is retracted. At the same time, the movable plate pushes the new pressure roller to move in the same direction on the die-changing screw, thereby completing the assembly, avoiding large-scale disassembly, saving the time spent on disassembly and assembly, making the replacement of the pressure roller faster, and thus improving work efficiency.

[0016] 2. The quick die-changing device and die-changing method of the roll-forming machine, through the setting of the adjusting screw, when replacing the pressure roller, the adjusting screw is driven to rotate by the adjusting nut, thereby driving the driving block located at the upper end and the rolling assembly and the die-changing mechanism thereon to move to the replacement position, reserving a suitable space for the disassembly and installation of the pressure roller, thereby facilitating the disassembly and installation of the pressure roller, and when roll-forming the steel pipe, the distance between the upper and lower pressure rollers can be adjusted by the adjusting screw to match steel pipes of different sizes, thereby improving the applicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the left structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the structure of the roller die base and other components of the present invention;

[0019] Figure 3 It is a schematic diagram of the left side cross-sectional structure of the roller die base of the present invention;

[0020] Figure 4 It is a schematic diagram of the cross-sectional structure of the right side of the roller die base of the present invention;

[0021] Figure 5 It is a schematic diagram of the left side structure of the connecting assembly and the mold changing mechanism of the present invention;

[0022] Figure 6 It is a schematic diagram of the right side structure of the connecting assembly and the mold changing mechanism of the present invention;

[0023] Figure 7 It is a schematic diagram of the right structure of the present invention;

[0024] Figure 8 It is a schematic diagram of the explosion structure of the pressing roller and the fixed cover of the present invention.

[0025] In the figure: 1. roller die seat; 11. vertical slide groove; 111. limiting groove; 12. sliding groove; 13. notch; 131. bearing seat; 14. steel pipe channel; 15. connecting seat; 151. adjusting threaded rod; 1511. adjusting nut; 2. roller bed; 3. straightening device; 4. connecting assembly; 41. driving block; 411. engaging groove; 412. guide rod; 413. vertical slider; 42. fixed plate; 421. driving groove; 422. mounting seat; 43. movable plate; 5. roller assembly; 51. pressure roller; 52. rotating shaft sleeve; 6. die changing mechanism; 61. push plate; 62. slide rod; 7. driving assembly; 71. screw rod; 711. driving gear; 72. hand wheel; 73. die changing screw; 731. driven gear; 74. chain; 8. fixing cover; 81. fixing bolt. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1-Figure 8 A quick die-changing device for a roll forming machine comprises a roll die seat 1, which is mounted on one end of a roll bed 2. A straightening device 3 is also provided at the other end of the roll bed 2. When sizing, the steel pipe passes through the roll die seat 1 and the straightening device 3 in sequence. The straightening device 3 pulls the steel pipe through the roll die seat 1. A connecting component 4, a roll assembly 5 and a die-changing mechanism 6 are provided on the roll die seat 1. Two connecting components 4 are sequentially arranged in the roll die seat 1 from top to bottom. The connecting component 4 comprises a driving block 41, a fixed plate 42 and a movable plate 43. The driving block 41 is mounted on the roll die seat 1, wherein the driving block 41 located at the upper end of the roll die seat 1 can move vertically, the fixed plate 42 is connected to one side of the driving block 41, and the movable plate 43 is connected to the fixed plate 42. 43 is slidingly arranged on the other side of the driving block 41, the rolling assembly 5 includes a pressure roller 51, the pressure roller 51 is installed on the fixed plate 42, and the other side of the pressure roller 51 is connected to the movable plate 43. When replacing the pressure roller 51, the driving block 41 located on the upper side of the rolling die seat 1 drives the rolling assembly 5 and the mold changing mechanism 6 thereon to move upward to the replacement position, the mold changing mechanism 6 includes a push plate 61 and a driving assembly 7, the push plate 61 is located between the fixed plate 42 and the pressure roller 51, the driving assembly 7 cooperates with the movable plate 43 and the push plate 61, after the driving block 41 on the upper side of the rolling die seat 1 moves to the replacement position, the driving assembly 7 drives the movable plate 43 to separate from the pressure roller 51, and drives the push plate 61 to push the pressure roller 51 away from the fixed plate 42.

[0028] Among them, when in use, the steel pipe to be processed passes through the roller die seat 1, passes between the upper and lower pressure rollers 51, and enters the straightening device 3. During processing, the straightening device 3 pulls the steel pipe, and the upper and lower pressure rollers 51 roll the steel pipe when the steel pipe passes through the roller die seat 1, so that the steel pipe is roll-formed by the pressure rollers 51, and then the roll-formed steel pipe enters the straightening device 3 for straightening. When the pressure rollers 51 have worked for a period of time and are worn by the steel pipe to the point that a new pressure roller 51 needs to be replaced, the processing of the steel pipe is first suspended, and then the driving block 41 at the upper end of the roller die seat 1 is driven to move upward to separate the upper and lower pressure rollers 51 by a suitable distance, thereby facilitating the replacement of the two pressure rollers 51. After the driving block 41 moves to the replacement position, the driving block 41 stops moving, and at this time the driving assembly 7 is driven forward to make the movable plate 43 move toward the side wall of the roller die seat 1. The push plate 61 moves in the same direction and separates from the fixed plate 42. At the same time, the driving assembly 7 also drives the push plate 61 to move in the same direction, so that the push plate 61 pushes the pressure roller 51 to separate from the fixed plate 42. When the movable plate 43 moves the maximum distance, the driving assembly 7 stops working. At this time, the pressure roller 51 is completely separated from the fixed plate 42, thereby completing the disassembly of the pressure roller 51, and then the assembly is started, the new pressure roller 51 is aligned with the push plate 61, and the driving assembly 7 is driven in the reverse direction, so that the movable plate 43 approaches the fixed plate 42 and pushes the pressure roller 51 to move in the same direction. At the same time, the push plate 61 also moves toward the fixed plate 42 until the movable plate 43 no longer moves, and then the driving assembly 7 is stopped, thereby completing the replacement of the pressure roller 51, and then the upper end driving block 41 of the roller pressing die holder 1 is driven to move downward, and the steel pipe is pressed against the pressure roller 51 below again to continue processing the steel pipe.

[0029] The difference from the above-mentioned embodiment is that the driving block 41 at the lower end is fixedly connected to the roller die base 1, and a snap-fit ​​groove 411 is provided on one side of the driving block 41, and the snap-fit ​​groove 411 corresponds to the movable plate 43. A guide rod 412 is fixedly connected in the snap-fit ​​groove 411, and the guide rod 412 slides through the movable plate 43 and is slidably connected to the inner wall of the roller die base 1, and a vertical slider 413 is also fixedly installed on the other side of the driving block 41 at the upper end, and a driving groove 421 is provided on one side of the fixed plate 42, and a mounting seat 422 is fixedly connected to the lower side of one end of the fixed plate 42 facing the straightening device 3.

[0030] Among them, before disassembly, the movable plate 43 is located in the engaging groove 411. During disassembly, the movable plate 43 leaves the engaging groove 411 under the guidance of the guide rod 412 and moves toward the side wall of the roller die seat 1. During assembly, the movable plate 43 moves toward the engaging groove 411 under the guidance of the guide rod 412. When the movable plate 43 moves into the engaging groove 411, the driving assembly 7 is stopped to complete the replacement of the pressure roller 51. Through the cooperation of the guide rod 412, the movable rod will not be offset during the movement.

[0031] The difference from the above-mentioned embodiment lies in that a vertical slide groove 11 is provided at the upper end of the rolling die base 1, a driving block 41 at the upper end is installed in the vertical slide groove 11, a limiting groove 111 is provided on the inner side of the vertical slide groove 11, a vertical slider 413 is slidably installed in the limiting groove 111, and sliding grooves 12 are provided at both upper and lower ends of one side of the rolling die base 1, wherein the sliding groove 12 at the upper end is connected with the top end of the vertical slide groove 11, the sliding groove 12 corresponds to the movable plate 43, and the movable plate 43 can slide in the sliding groove 12.

[0032] Among them, the upper driving block 41 moves up and down in the vertical slide groove 11 with the cooperation of the vertical slider 413 and the limiting groove 111. When the upper driving block 41 moves up to correspond to the sliding groove 12, the driving block 41 is now located in the replacement position. At this time, the upper driving block 41 is stopped and the mold changing mechanism 6 is driven to replace the pressure roller 51. When disassembling and assembling the pressure roller 51, the driving component 7 drives the movable plate 43 to move in the sliding groove 12.

[0033] The difference from the above embodiment is that a notch 13 is formed on the side of the roller die seat 1 , a bearing seat 131 is slidably mounted on the notch 13 , the bearing seat 131 corresponds to the sliding groove 12 , and a steel pipe channel 14 runs through the middle of the roller die seat 1 .

[0034] When the driving member moves up and down, the driving assembly 7 drives the bearing seat 131 to move synchronously on the groove 13. The inner diameter of the steel pipe channel 14 is larger than the diameter of the steel pipe. When processing the steel pipe, the steel pipe passes through the steel pipe channel 14 and then passes between the two pressure rollers 51.

[0035] The difference from the above embodiment is that the driving assembly 7 includes a screw rod 71, a hand wheel 72 and a mold-changing screw rod 73. One end of the screw rod 71 is rotatably connected to the inner side of the fixed plate 42 and extends into the driving groove 421. The end of the screw rod 71 located in the driving groove 421 is coaxially fixedly connected with a driving gear 711. The other end of the screw rod 71 is rotatably mounted on the bearing seat 131 and extends therefrom. The hand wheel 72 is coaxially fixedly connected to the extended end of the screw rod 71 and is located on one side of the bearing seat 131. One end of the mold-changing screw rod 73 is rotatably mounted on the fixed plate 42. A driven gear 731 is also coaxially fixedly connected to the end. The driven gear 731 is located on the outer side of the fixed plate 42. The driven gear 731 is connected to the driving gear 711 through a chain 74. The other end of the mold-changing screw rod 73 slides through the movable plate 43.

[0036] Among them, when the driving member moves in the vertical slide groove 11, the screw rod 71 drives the bearing seat 131 to move synchronously on the groove 13. When disassembling the pressure roller 51, the hand wheel 72 is rotated in the forward direction to drive the screw rod 71 and the driving gear 711 thereon to rotate in the same direction. The rotating screw rod 71 drives the movable plate 43 away from the fixed plate 42. The driving gear 711 drives the driven gear 731 to rotate through the chain 74, thereby driving the mold changing screw 73 to rotate in the same direction. When assembling the pressure roller 51, the hand wheel 72 is rotated in the reverse direction to drive the screw rod 71 and the driving gear 711 thereon to rotate in the same direction. The rotating screw rod 71 drives the movable plate 43 to approach the fixed plate 42. The driving gear 711 drives the driven gear 731 to rotate through the chain 74, thereby driving the mold changing screw 73 to rotate in the same direction.

[0037] The difference from the above-mentioned embodiment is that the push plate 61 is assembled on the mold changing screw 73 through a thread, and a slide rod 62 is fixedly connected to one side of the lower end of the push plate 61. The slide rod 62 is slidably installed on the mounting seat 422. When the push plate 61 pushes the pressure roller 51, it drives the slide rod 62 to slide on the mounting seat 422.

[0038] When the mold-changing screw 73 rotates forward, the push plate 61 removes the pressure roller 51 with the cooperation of the slide rod 62. When the mold-changing screw rod rotates reversely, the push plate 61 is retracted. When the push plate 61 moves, it drives the slide rod 62 to move in the same direction.

[0039] The difference from the above-mentioned embodiment is that the rolling assembly 5 also includes a rotating shaft sleeve 52, and the pressure roller 51 is rotatably mounted on the rotating shaft sleeve 52. The rotating shaft sleeve 52 is sleeved on the mold changing screw 73. When the pressure roller 51 is not replaced, one end of the rotating shaft sleeve 52 abuts against the push plate 61, and the other end thereof abuts against the movable plate 43. When the pressure roller 51 is replaced, the push plate 61 pushes the rotating shaft sleeve 52 to move on the mold changing screw 73.

[0040] Among them, when rolling the steel pipe, the pressure roller 51 rubs against the steel pipe and rotates on the rotating shaft sleeve 52. When removing the pressure roller 51, the push plate 61 pushes the rotating shaft sleeve 52 and the pressure roller 51 thereon off the die-changing screw 73. After the old pressure roller 51 is removed, the rotating shaft sleeve 52 thereon is removed and installed on the new pressure roller 51. Subsequently, the rotating shaft sleeve 52 is aligned with the die-changing screw 73 for assembly. After the assembly is completed, the two ends of the rotating shaft sleeve 52 respectively abut against the movable plate 43 and the push plate 61.

[0041] The difference from the above embodiment is that a fixing cover 8 is provided on one side of the movable plate 43 , and fixing bolts 81 are assembled on the fixing cover 8 , and the rotating shaft sleeve 52 is fixedly connected to the movable plate 43 via the fixing bolts 81 .

[0042] Before disassembly, loosen the fixing bolts 81, remove the fixing cover 8 and the fixing bolts 81 thereon from the movable plate 43, and complete the fixation of the rotating shaft sleeve 52. After assembly, install the fixing cover 8 back on the movable plate 43, and tighten the fixing bolts 81 to fix the rotating shaft sleeve 52 again.

[0043] The difference from the above-mentioned embodiment is that a connecting seat 15 is fixedly installed on the top of the roller die seat 1, and an adjusting threaded rod 151 is threadedly assembled in the connecting seat 15, one end of the adjusting threaded rod 151 is rotatably connected to the top of the driving block 41 at the upper end, and an adjusting nut 1511 is assembled on the top of the adjusting threaded rod 151.

[0044] Before disassembly, the adjusting nut 1511 is rotated forward by using a wrench to pull the adjusting threaded rod 151 upward, so that the adjusting threaded rod 151 pulls the driving block 41 upward. After assembly is completed, the adjusting nut 1511 is rotated reversely by using a wrench to push the adjusting threaded rod 151 downward, so that the adjusting threaded rod 151 pushes the driving block 41 downward. During processing, the spacing between the upper and lower pressure rollers 51 can also be adjusted by rotating the adjusting screw to match steel pipes of different diameters.

[0045] The invention discloses a die changing method, which uses a rapid die changing device of a roll forming machine.

[0046] Working principle: When in use, after the steel pipe enters the steel pipe channel 14, it passes between the two pressure rollers 51, passes through the roller die holder 1, and enters the straightening device 3. The inner diameter of the steel pipe channel 14 is larger than the diameter of the steel pipe. During processing, the straightening device 3 pulls the steel pipe, and the upper and lower pressure rollers 51 roll the steel pipe and rub against the steel pipe when the steel pipe passes through the roller die holder 1, and rotate on the rotating shaft sleeve 52, so that the steel pipe is roll-formed by the pressure rollers 51, and rubs against the steel pipe, and rotates on the rotating shaft sleeve 52. Then, the roll-formed steel pipe enters the straightening device 3 for straightening. When the pressure roller 51 has worked for a period of time and is worn by the steel pipe to the point that a new pressure roller 51 needs to be replaced, first suspend the processing of the steel pipe, then loosen the fixing bolts 81, and remove the fixing cover 8 and the fixing bolts thereon. The fixed bolt 81 is removed from the movable plate 43 to end the fixation of the rotating shaft sleeve 52, and then the adjusting nut 1511 is turned forward by a wrench to pull the adjusting threaded rod 151 upward, so that the adjusting threaded rod 151 pulls the driving block 41 and moves upward in the vertical slide groove 11 under the cooperation of the vertical slider 413 and the limiting groove 111, so as to separate the upper and lower pressure rollers 51 by a suitable distance, thereby facilitating the replacement of the two pressure rollers 51. At the same time, the screw rod 71 drives the bearing seat 131 to move synchronously to a corresponding height on the notch 13. When the upper driving block 41 moves up to correspond to the sliding groove 12, the driving block 41 is at the replacement position at this time, and the movement of the upper driving block 41 is stopped at this time, wherein, before disassembly, the movable plate 43 is located in the engaging groove 411;

[0047] At this time, the hand wheel 72 is turned forward, and the driving screw 71 and the driving gear 711 thereon rotate in the same direction. The rotating screw 71 drives the movable plate 43 to leave the engaging groove 411 under the guidance of the guide rod 412 and move toward the side wall of the roller die holder 1. The driving gear 711 drives the driven gear 731 to rotate through the chain 74, thereby driving the die-changing screw 73 to rotate in the same direction, driving the push plate 61 to push the shaft sleeve 52 and the pressure roller 51 thereon off the die-changing screw 73 under the cooperation of the slide rod 62. After the movable plate 43 moves the maximum distance, the driving assembly 7 stops working. At this time, the pressure roller 51 is completely separated from the fixed plate 42, thereby completing the disassembly of the pressure roller 51. After the old pressure roller 51 is disassembled, the shaft sleeve 52 on it is removed and installed on the new pressure roller 51. Then, the shaft sleeve 52 is aligned with the mold-changing screw 73, and then the assembly is started. The hand wheel 72 is rotated in the opposite direction, and the drive screw 71 and the drive gear 711 thereon rotate in the same direction. Under the guidance of the guide rod 412, the movable plate 43 moves toward the card The driving gear 711 drives the driven gear 731 to rotate through the chain 74, thereby driving the mold changing screw 73 to rotate in the same direction, retracting the push plate 61. When the push plate 61 moves, it drives the slide bar 62 to move in the same direction. When the movable plate 43 moves into the engaging groove 411, the driving assembly 7 stops, thereby completing the replacement of the pressure roller 51. At this time, the two ends of the rotating shaft sleeve 52 respectively abut against the movable plate 43 and the push plate 61. 1, then install the fixing cover 8 back on the movable plate 43, and tighten the fixing bolt 81 to fix the rotating shaft sleeve 52 again, turn the adjusting nut 1511 with a wrench to rotate it in the opposite direction, push the adjusting threaded rod 151 downward, so that the adjusting threaded rod 151 pushes the driving block 41 to move downward, and press the steel pipe against the pressing roller 51 below again, and continue to process the steel pipe. During processing, the spacing between the upper and lower pressing rollers 51 can also be adjusted by rotating the adjusting screw to match steel pipes with different diameters.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A quick die changing device for a roll forming machine, comprising a roll die seat, the roll die seat is mounted on one end of a roll bed, and a straightening device is also provided at the other end of the roll bed. When sizing, the steel pipe passes through the roll die seat and the straightening device in sequence, and the straightening device pulls the steel pipe through the roll die seat, characterized in that: The roller die seat is provided with a connecting assembly, a roller die assembly and a die changing mechanism, the two connecting assemblies are sequentially arranged in the roller die seat from top to bottom, the connecting assembly comprises a driving block, a fixed plate and a movable plate, the driving block is installed on the roller die seat, wherein the driving block located at the upper end of the roller die seat can move vertically, the fixed plate is connected to one side of the driving block, and the movable plate is slidably arranged on the other side of the driving block, the roller die assembly comprises a pressure roller, the pressure roller is installed on the fixed plate, and the other side of the pressure roller is connected to the movable plate, when the pressure roller is replaced, the driving block located on the upper side of the roller die seat drives the roller die assembly and the die changing mechanism thereon to move upward to the replacement position, the die changing mechanism comprises a push plate and a driving assembly, the push plate is located between the fixed plate and the pressure roller, the driving assembly cooperates with the movable plate and the push plate, after the driving block on the upper side of the roller die seat moves to the replacement position, the driving assembly drives the movable plate to separate from the pressure roller, and drives the push plate to push the pressure roller away from the fixed plate; The driving block at the lower end is fixedly connected to the roller die seat, a clamping groove is provided on one side of the driving block, the clamping groove corresponds to the movable plate, a guide rod is fixedly connected in the clamping groove, the guide rod slides through the movable plate, and is slidably connected to the inner wall of the roller die seat, a vertical slider is also fixedly installed on the other side of the driving block at the upper end, a driving groove is provided on one side of the fixed plate, and a mounting seat is fixedly connected to the lower side of one end of the fixed plate facing the straightening device; The push plate is assembled on the mold changing screw of the driving assembly through a thread, and a slide rod is fixedly connected to one side of the lower end of the push plate. The slide rod is slidably installed on the mounting seat. When the push plate pushes the pressure roller, the slide rod is driven to slide on the mounting seat.

2. A quick die changing device for a roll forming machine according to claim 1, characterized in that: A vertical slide groove begins to be provided at the upper end of the rolling die seat, the driving block located at the upper end is installed in the vertical slide groove, a limiting groove is provided on the inner side of the vertical slide groove, the vertical slider is slidably installed in the limiting groove, and sliding grooves are provided at the upper and lower ends of one side of the rolling die seat, wherein the sliding groove located at the upper end is connected to the top end of the vertical slide groove, the sliding groove corresponds to the movable plate, and the movable plate can slide in the sliding groove.

3. A quick die changing device for a roll forming machine according to claim 2, characterized in that: A notch is also formed at the side of the roller die seat, on which a bearing seat is slidably mounted, the bearing seat corresponding to the sliding groove, and a steel pipe passage runs through the middle of the roller die seat.

4. A quick die changing device for a roll forming machine according to claim 3, characterized in that: The driving assembly includes a screw rod, a handwheel and a mold-changing screw rod, one end of the screw rod is rotatably connected to the inner side of the fixed plate and extends into the driving groove, the end of the screw rod located in the driving groove is coaxially fixedly connected with a driving gear, the other end of the screw rod is rotatably mounted on the bearing seat and extends therefrom, the handwheel is coaxially fixedly connected to the extended end of the screw rod and is located on one side of the bearing seat, one end of the mold-changing screw rod is rotatably mounted on the fixed plate, and a driven gear is also coaxially fixedly connected to the end, the driven gear is located on the outer side of the fixed plate, the driven gear is connected to the driving gear through a chain, and the other end of the mold-changing screw rod slides through the movable plate.

5. A quick die changing device for a roll forming machine according to claim 4, characterized in that: The rolling assembly also includes a rotating shaft sleeve, the pressure roller is rotatably mounted on the rotating shaft sleeve, and the rotating shaft sleeve is sleeved on the mold changing screw. When the pressure roller is not replaced, one end of the rotating shaft sleeve abuts against the push plate, and the other end thereof abuts against the movable plate. When the pressure roller is replaced, the push plate pushes the rotating shaft sleeve to move on the mold changing screw.

6. A quick die changing device for a roll forming machine according to claim 5, characterized in that: A fixing cover is arranged on one side of the movable plate, and fixing bolts are mounted on the fixing cover, and the rotating shaft sleeve is fixedly connected to the movable plate through the fixing bolts.

7. A quick die changing device for a roll forming machine according to claim 1, characterized in that: A connecting seat is fixedly installed on the top of the rolling die seat, and an adjusting threaded rod is threadedly assembled in the connecting seat. One end of the adjusting threaded rod is rotatably connected to the top of the driving block at the upper end, and an adjusting nut is assembled on the top of the adjusting threaded rod.

8. A mold changing method, characterized in that: A quick die changing device for a roll forming machine as described in any one of claims 1 to 7 is used.

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