A large-diameter steel pipe press grooving machine

Abstract

The present application relates to the technical field of steel pipe notching, in particular to a large-diameter steel pipe notching machine, which comprises a pre-pressing assembly, a steel pipe, an assembly mechanism arranged on the pre-pressing assembly, a groove distance adjusting mechanism arranged on the assembly mechanism, a die distance adjusting mechanism arranged in the groove distance adjusting mechanism, and a pipe body stabilizing mechanism arranged on the die distance adjusting mechanism; the pre-pressing assembly is installed on a machine tool and provides a supporting force for the assembly mechanism; the steel pipe is arranged outside the groove distance adjusting mechanism and the pipe body stabilizing mechanism. By setting the workbench of the traditional fixed structure to a gradually adjustable die pressing workbench, the range of the die pressing notch is adjusted without changing the pressure state of the pipe fitting, and the depth of the die pressing notch is further adjusted, so that the pipe fitting can be prepared with high precision without frequent replacement of the machining table, and the production efficiency of the pipe fitting notching is improved.

Description

Technical Field

[0001] This invention relates to the field of steel pipe grooving technology, specifically to a large-diameter steel pipe grooving machine. Background Technology

[0002] A steel pipe grooving machine is a device that performs grooving processing on pipe fittings. When a steel pipe is placed on a workbench, continuous pressure is applied to the steel pipe, and the pressure-bearing part of the steel pipe will gradually bend and form a shape that fits the pre-set groove of the workbench.

[0003] Currently, there are certain defects in the use of grooving machines. Because the grooving machine's worktable is a rotating roller structure, a certain depth of annular grooves are opened on its outside. However, this specific worktable structure can only press steel pipes into specific shapes. When it is necessary to press steel pipes into gradually varying groove depths, it is necessary to change the worktable to achieve this. The pre-processed steel pipe and the additional worktable need to be finely adjusted. This method is not only cumbersome, but it also reduces the accuracy of the gradually varying groove pressing of the steel pipe.

[0004] In view of this, a large-diameter steel pipe grooving machine was designed to solve the above problems. Summary of the Invention

[0005] The present invention aims to solve one of the technical problems existing in the prior art or related technologies.

[0006] Therefore, the technical solution adopted in this invention is as follows: A large-diameter steel pipe grooving machine includes a pre-pressing assembly and a steel pipe, an assembly mechanism mounted on the pre-pressing assembly, a groove spacing adjustment mechanism mounted on the assembly mechanism, a die spacing adjustment mechanism within the groove spacing adjustment mechanism, and a pipe body stabilizing mechanism mounted on the die spacing adjustment mechanism. The pre-pressing assembly is mounted on a machine tool and provides rotational support to the assembly mechanism. The steel pipe is positioned outside the groove spacing adjustment mechanism and the pipe body stabilizing mechanism. The assembly mechanism provides a sufficiently pressure-resistant support platform for the groove spacing adjustment mechanism and the die spacing adjustment mechanism. The groove spacing adjustment mechanism includes… The main mold assembly and the sub-mold assembly include two inner spacer plates on the main mold assembly and two outer spacer plates on the sub-mold assembly, with the two inner spacer plates fitted to the inner sides of the two outer spacer plates. The main mold assembly and the sub-mold assembly are used for gradual groove adjustment of pipe fittings of different lengths. The pipe body stabilization mechanism is used to provide stabilization protection for grooved pipe fittings of different lengths. The mold distance adjustment mechanism includes a pressure-bearing crossbar installed in the main mold assembly and the sub-mold assembly, and a pad installed in the sub-mold assembly and mounted on the pressure-bearing crossbar. The outer end of the pad is provided with two limiting plates.

[0007] In a preferred embodiment, the present invention can be further configured such that: the main mold assembly includes a main base, and the outer end of the main base is provided with two positioning grooves; A baffle pad is installed on the top of the main base, and a main pressure column is provided inside the main base; Two first springs are symmetrically distributed inside the main pressure column and the main base; The inner end of the main base is provided with a first mold; The sub-mold assembly includes a sub-base, and a sub-pressure column is provided inside the sub-base. The sub-pressure column has two arc grooves inside. The secondary pressure column and the secondary base are equipped with two symmetrically distributed second springs inside; A second mold is provided at the inner end of the sub-base.

[0008] In a preferred embodiment, the present invention can be further configured such that: the tube stabilization mechanism includes a positioning column head, the inner end of the positioning column head is provided with a column head, and the top and bottom of the positioning column head are provided with a plurality of evenly distributed screw holes; The outer end of the positioning column head is provided with a beam, and the top and bottom of the beam are provided with transverse grooves; A plug is provided at the other end of the beam; The beam is provided with multiple sliding sleeves on its outside, and the sliding sleeves are provided with grinding wheels on their outside. The grinding wheel has rough edges on its side to increase frictional resistance.

[0009] In a preferred embodiment, the present invention can be further configured such that: two symmetrically distributed slides are provided on the outer wall of the pressure-bearing crossbar, and an insertion hole is provided in the end of the pressure-bearing crossbar that extends to the outside of the pad block; Both the inside of the insertion hole and the end of the other end of the pressure-bearing crossbar are equipped with pins. The top and bottom of the pad are both fitted with first bolts; A second bolt is provided inside both of the aforementioned limiting plates.

[0010] In a preferred embodiment, the present invention may be further configured such that the slot pitch adjustment mechanism further includes two first latches, two second latches, and two third bolts; The two first buckles are used to secure the stacked main base and the first mold; The two second buckles are used to secure the stacked sub-base and the second mold.

[0011] In a preferred embodiment, the present invention can be further configured such that: both the inner spacer plate and the third bolt are made of stainless steel, and the inner spacer plate has a plurality of equally spaced sockets inside, while the third bolt has a threaded groove adapted to match the symmetrical sockets inside. The two third bolts are respectively installed in the threaded slots of the two outer spacer plates.

[0012] In a preferred embodiment, the present invention can be further configured such that: the assembly mechanism includes a pad, an outer column head is provided at the outer end of the pad, an inner column head is provided at the inner end of the pad, and two symmetrically distributed buckle plates are provided at the inner end of the pad; Multiple combination bolts are provided between the pad and the main base.

[0013] In a preferred embodiment, the present invention may be further configured such that: the pre-compression component includes a clamping fixture mounted on an external machine tool, the clamping fixture having a vertical groove inside, and a pressing wheel for pre-compressing steel pipe being disposed in the vertical groove, and the pressing wheel being mounted on an external hydraulic device.

[0014] In a preferred embodiment, the present invention may be further configured such that: the inner column head has a hole adapted to be connected to the bearing crossbar column head, and two other pins installed on the inner column head of the bearing crossbar pass through two through holes inside the inner column head.

[0015] In a preferred embodiment, the present invention can be further configured such that: both the main pressure column and the auxiliary pressure column are provided with two symmetrically distributed main T-shaped sliders on their exteriors; The inner walls of both the main pressure column and the auxiliary pressure column are provided with two auxiliary T-shaped sliders; Two of the main T-shaped sliders are fitted into the grooves in the main base and the inner wall of the first mold, and the other two main T-shaped sliders are fitted into the grooves in the sub-base and the inner wall of the second mold. Furthermore, the two sets of T-shaped sliders are fitted and installed in the two slides.

[0016] By adopting the above technical solution, the beneficial effects achieved by the present invention are as follows: 1. This invention sets a traditional fixed-structure worktable as a gradually adjustable molding worktable. By adjusting the range of the molding groove without changing the pressure state of the pipe, and further controlling the depth of the molding groove, the pipe can be prepared with high precision without frequent changes of the processing table, thus improving the production efficiency of pipe molding.

[0017] 2. The present invention sets a pipe stabilization mechanism on the graded workbench. When it is necessary to perform groove processing on pipes of different lengths, the pipe stabilization mechanism can perform adaptive stabilization and adjustment according to the outer end of the pipe of different lengths. The stabilized long pipe can maintain a constant processing center of gravity during grooving, so as to avoid the long pipe end from tilting due to uneven pressure, which would cause deformation of the grooving port.

[0018] 3. By setting up multiple grinding rollers that can increase the frictional resistance on the inner wall of the pipe fitting, the present invention can prevent the rotating pipe fitting from slipping outward under the influence of the pipe fitting's gravity after the pipe fitting is placed on the new workbench, thereby improving the stability of the pipe fitting during the grooving process. Attached Figure Description

[0019] Figure 1 This is a schematic diagram illustrating the use of the present invention; Figure 2 This is a front view of the present invention; Figure 3 This is a schematic diagram of the pre-compression component of the present invention; Figure 4 For the present invention Figure 3 An explosion diagram; Figure 5 This is a schematic diagram of the tube stabilization mechanism of the present invention; Figure 6 This is a schematic diagram of the assembly mechanism of the present invention; Figure 7 This is a schematic diagram of the pitch adjustment mechanism of the present invention; Figure 8 This is a schematic diagram of the slot pitch adjustment mechanism of the present invention; Figure 9 For the present invention Figure 8 Enlarged view of point A in the middle; Figure 10 This is an exploded view of the main mold assembly and the sub-mold assembly of the present invention.

[0020] Figure label: 100. Pre-compression assembly; 110. Clamping fixture; 120. Grooving wheel; 200. Steel pipe; 300. Assembly mechanism; 310. Washer plate; 320. Outer column head; 330. Inner column head; 340. Buckle plate; 350. Combination bolt; 400. Slot pitch adjustment mechanism; 410. Main mold assembly; 411. Main base; 412. Material stop pad; 413. Positioning slot; 414. Main pressure column; 415. First mold; 416. First spring; 420. First buckle; 430. Secondary mold assembly; 431. Secondary base; 432. Secondary pressure column; 433. Arc groove; 434. Second mold; 435. Second spring; 440. Second buckle; 450. Inner spacer plate; 460. Outer spacer plate; 470. Third bolt; 500. Pipe body stabilization mechanism; 510. Positioning column head; 520. Beam rod; 530. Plug; 540. Sliding sleeve; 550. Grinding wheel; 600. Dial gap adjustment mechanism; 610. Pressure-bearing crossbar; 620. Slide rail; 630. Pad block; 640. First bolt; 650. Limiting plate; 660. Second bolt; 670. Insertion hole; 680. Pin. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0022] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention.

[0023] The following describes, with reference to the accompanying drawings, some embodiments of a large-diameter steel pipe grooving machine provided by the present invention.

[0024] Example 1: Combination Figures 1-10 As shown, the present invention provides a large-diameter steel pipe grooving machine, comprising a pre-pressing assembly 100 and a steel pipe 200, an assembly mechanism 300 disposed on the pre-pressing assembly 100, a groove spacing adjustment mechanism 400 disposed on the assembly mechanism 300, a die spacing adjustment mechanism 600 disposed within the groove spacing adjustment mechanism 400, and a pipe body stabilizing mechanism 500 disposed on the die spacing adjustment mechanism 600. The pre-pressing assembly 100 is mounted on a machine tool and provides rotational support for the assembly mechanism 300. The steel pipe 200 is disposed outside the groove spacing adjustment mechanism 400 and the pipe body stabilizing mechanism 500. The assembly mechanism 300 provides a sufficiently pressure-resistant support platform for the groove spacing adjustment mechanism 400 and the die spacing adjustment mechanism 600. The groove spacing adjustment mechanism 400 performs gradual grooving processing on the steel pipe 200. The pipe body stabilizing mechanism 500 provides stabilizing protection for the gradual grooving of the steel pipe 200. The die spacing adjustment mechanism 600 provides effective support for the gradually extending groove spacing adjustment mechanism 400.

[0025] The pre-compression assembly 100 includes a clamping fixture 110 mounted on an external machine tool. The clamping fixture 110 has a vertical groove inside, and a pressing wheel 120 for pre-compressing the steel pipe 200 is provided in the vertical groove. The pressing wheel 120 is mounted on an external hydraulic device. The assembly mechanism 300 includes a pad 310, an outer column head 320 at the outer end of the pad 310, an inner column head 330 at the inner end of the pad 310, and two symmetrically distributed buckle plates 340 at the inner end of the pad 310. The slot spacing adjustment mechanism 400 includes a main mold assembly 410, a secondary mold assembly 430, two first buckles 420, two second buckles 440, and two third bolts 470. Two inner spacer plates 450 are provided on the main mold assembly 410, and two outer spacer plates 460 are provided on the secondary mold assembly 430. The two inner spacer plates 450 are adapted to fit against the inner side of the two outer spacer plates 460. The main mold assembly 410 and the secondary mold assembly 430 are used to adjust the gradual groove pressing of pipe fittings of different lengths; Both the inner spacer plate 450 and the third bolt 470 are made of stainless steel. The inner spacer plate 450 has multiple equally spaced sockets inside, while the third bolt 470 has threaded slots inside that are adapted to match the sockets. Two third bolts 470 are respectively set in the threaded slots of the two outer spacer plates 460; The pipe stabilization mechanism 500 is used to provide stabilization protection for the grooves of different pipe fittings; The die length adjustment mechanism 600 includes a pressure-bearing crossbar 610 disposed in the main die assembly 410 and the sub-die assembly 430, and a pad 630 disposed in the sub-die assembly 430 and mounted on the pressure-bearing crossbar 610. Two limiting plates 650 are provided at the outer end of the pad 630. The outer wall of the pressure-bearing crossbar 610 is provided with two symmetrically distributed slides 620, and the end of the pressure-bearing crossbar 610 that extends to the outside of the pad block 630 is provided with an insertion hole 670. A pin 680 is provided inside the socket 670 and at the other end of the pressure-bearing crossbar 610; The top and bottom of the pad 630 are both fitted with the first bolt 640; A second bolt 660 is provided inside each of the two limiting plates 650.

[0026] When the shorter steel pipe 200 is placed outside the stacked grinding rollers 550, the stacked grinding rollers 550 can provide anti-slip protection for the rotating steel pipe 200. At this time, the shorter steel pipe 200 can rotate effectively outside the groove adjustment mechanism 400 and the stacked grinding rollers 550. As the external hydraulic equipment pushes the groove pressing roller 120 downward toward the end of the steel pipe 200, the end of the steel pipe 200 that has been assisted in rotation can be prepared according to the specified groove depth. When a long steel pipe 200 needs to be grooved, multiple grinding rollers 550 need to be stretched outward along the outside of the beam 520 in the manner described above until the multiple grinding rollers 550 are evenly distributed on the beam 520. At this time, the long steel pipe 200 can maintain the stability of its center of gravity during the grooved preparation. When steel pipes 200 of different lengths need to be prepared with gradually changing groove depths at their ends, the expansion can be achieved by adjusting the sub-mold assembly 430 and the main mold assembly 410. At this time, the first spring 416, the second mold 434, the sub-pressure column 432, and the main pressure column 414 can improve the preparation efficiency of the gradually changing grooved ends of the pipe fittings without changing the processing points of the steel pipe 200 or frequently changing the worktable.

[0027] Example 2: Combination Figures 6-10As shown, based on Embodiment 1, the main mold assembly 410 includes a main base 411, and two positioning grooves 413 are provided at the outer end of the main base 411. A baffle pad 412 is installed on the top of the main base 411, and a main pressure column 414 is provided inside the main base 411.

[0028] Preferably, the baffle pad 412 can be bolted to the top of the main base 411, and the distance between the baffle pad 412 and the first mold 415 can be controlled by the bolts. At this time, the side reserved width of the pressure-bearing port of the steel pipe 200 can be selected.

[0029] Two first springs 416 are symmetrically distributed inside the main pressure column 414 and the main base 411; The inner end of the main base 411 is provided with a first mold 415; The sub-mold assembly 430 includes a sub-base 431, and a sub-pressure column 432 is provided inside the sub-base 431. The sub-pressure column 432 has two arc grooves 433 inside. Two second springs 435 are symmetrically distributed inside the secondary pressure column 432 and the secondary base 431; A second mold 434 is provided at the inner end of the sub-base 431.

[0030] Preferably, the adjacent slopes of the first mold 415 and the second mold 434 form a quarter-circle annular structure. When the first mold 415 and the second mold 434 are joined together, a semi-circular structure is formed. In this state, the pipe end can be pre-grooved. As the first mold 415 and the second mold 434 extend outward, in conjunction with the relative extension of the main pressure column 414 and the secondary pressure column 432, the pipe end can finally be pre-grooved.

[0031] Two first buckles 420 are used to fix the stacked main base 411 and the first mold 415; Two second clips 440 are used to secure the stacked sub-base 431 and the second mold 434.

[0032] Preferably, the two positioning slots 413 on the main base 411, together with the two buckle plates 340, form a stable pressure-bearing platform. When the external machine tool's transmission equipment drives the external column head 320, the steel pipe 200 placed on the slot spacing adjustment mechanism 400 can be efficiently prepared by pressing the slot under the state of assisted rotation.

[0033] Example 3: Combination Figure 6 and Figure 10 As shown, based on Embodiment 1, a plurality of combined bolts 350 are provided between the pad 310 and the main base 411; Both the main pressure column 414 and the auxiliary pressure column 432 are provided with two symmetrically distributed main T-shaped sliders on their exteriors; The inner walls of both the main pressure column 414 and the auxiliary pressure column 432 are provided with two auxiliary T-shaped sliders; Two of the main T-shaped sliders are adapted to be installed in the grooves on the inner walls of the main base 411 and the first mold 415, and the other two main T-shaped sliders are adapted to be installed in the grooves on the inner walls of the secondary base 431 and the second mold 434. Furthermore, the two sets of T-shaped sliders are fitted and installed in two slide rails 620; The inner column head 330 has a hole adapted to be connected to the column head of the bearing crossbar 610. Two other pins 680 installed on the inner column head of the bearing crossbar 610 pass through two through holes inside the inner column head 330. Preferably, two inner spacer plates 450 are fixedly installed on the port at the inner end of the main pressure column 414, and two outer spacer plates 460 are fixedly installed on the annular protrusion on the inner wall of the arc groove 433. The two inner spacer plates 450 are adapted to penetrate into the two arc grooves 433. By controlling the locking of the inner spacer plates 450 and the outer spacer plates 460 after lateral movement by the two third bolts 470, the relatively extended main pressure column 414 and the auxiliary pressure column 432 can remain stable after extension.

[0034] Example 4: Combination Figures 4-7 As shown, in the above embodiment, the tube stabilization mechanism 500 includes a positioning head 510, the inner end of the positioning head 510 is provided with a head, and the top and bottom of the positioning head 510 are provided with a plurality of evenly distributed screw holes. The outer end of the positioning column head 510 is provided with a beam 520, and the top and bottom of the beam 520 are provided with transverse grooves; A plug 530 is provided at the other end of the beam 520; Multiple sliding sleeves 540 are provided on the outside of the beam 520, and a grinding wheel 550 is provided on the outside of the sliding sleeve 540. The grinding wheel 550 has burrs on its side to increase friction resistance.

[0035] Preferably, the two second bolts 660 are fitted into the screw holes inside the positioning column head 510. When the two second bolts 660 are loosened and the limiting plate 650 is controlled to move along the outside of the positioning column head 510, the sub-mold assembly 430 can be precisely spaced with the main mold assembly 410. The positioning column head 510 and the beam 520, which are connected to the pressure-bearing crossbar 610 and remain horizontal, can cooperate with the multiple freely movable grinding wheels 550 to provide anti-slip protection for steel pipes 200 of different lengths.

[0036] The working principle and usage process of this invention: As an important mechanical precision machining equipment, the grooving machine is widely used in various fields. It can perform precise grooving on sheet metal parts and pipes, so that they can be accurately bent under pressure until they form a specified shape. The grooving machine mainly consists of components such as the machine body, worktable, pressure system and control system. This device innovates by modifying the machine body for pressing grooves into workpieces; When the pipe to be processed is short, the three grinding rollers 550 can be retracted and stacked until the three stacked grinding rollers 550 approach and press against the end face of the outer end of the positioning pin 510. At this time, the pin of the inner end of the positioning pin 510 will be fixed inside the insertion hole 670 by two of the pins 680. The steel pipe 200 in the initial state will be pressed by the three stacked grinding rollers 550, and the inner end of the steel pipe 200 will be supported by the inner end of the retaining pad 412. At this time, the inner end of the shorter steel pipe 200 can be located outside the annular groove formed by the first mold 415 and the second mold 434. As the hydraulic system pushes the grooving wheel 120 down along the vertical groove inside the clamping fixture 110, the pre-installed mold edge of the grooving wheel 120 can press the inner end of the steel pipe 200 into the annular groove formed by the first mold 415 and the second mold 434. With the uniform rotation of the assembly mechanism 300 as a whole and the rotation of the grooving wheel 120 at the same speed, the shorter steel pipe 200 can finally be quickly grooved. When the pipe to be processed is long, the three grinding rollers 550 can be stretched outward at equal intervals until the three grinding rollers 550 are evenly distributed on the beam 520. At this time, the longer steel pipe 200 can be effectively supported by the three pipe stabilization mechanisms 500 after stretching. Before placing the longer steel pipe 200, the groove pressing requirements of the pipe end are determined. First, loosen the two third bolts 470, then stretch the two outer spacer plates 460 outwards. At this time, the main pressure column 414 and the auxiliary pressure column 432 can expand outwards along the pressure-bearing crossbar 610. Then, loosen the two second bolts 660, and then control the two limit plates 650 to stretch outwards until the assembled pad 630 and the auxiliary base 431 move further outwards along the pressure-bearing crossbar 610. At this time, the pipe fitting can be processed with a gradual groove depth without changing the pressure-bearing mold. This improves the grooving efficiency and avoids the time-consuming problem caused by frequent mold changes.

[0037] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A large-diameter steel pipe grooving machine, comprising a pre-pressing assembly (100) and a steel pipe (200), characterized in that, It also includes an assembly mechanism (300) disposed on the pre-compression assembly (100), a slot pitch adjustment mechanism (400) disposed on the assembly mechanism (300), a die pitch adjustment mechanism (600) disposed within the slot pitch adjustment mechanism (400), and a tube body stabilizing mechanism (500) disposed on the die pitch adjustment mechanism (600): The preload assembly (100) is mounted on the machine tool and provides a rotational support force for the assembly mechanism (300); The steel pipe (200) is disposed outside the groove pitch adjustment mechanism (400) and the pipe body stabilization mechanism (500); The assembly mechanism (300) is used to provide a sufficiently pressure-resistant support platform for the slot pitch adjustment mechanism (400) and the mold pitch adjustment mechanism (600); The slot spacing adjustment mechanism (400) includes a main mold assembly (410) and a secondary mold assembly (430), two inner spacer plates (450) disposed on the main mold assembly (410), and two outer spacer plates (460) disposed on the secondary mold assembly (430), wherein the two inner spacer plates (450) are adapted to fit against the inner side of the two outer spacer plates (460); The main mold assembly (410) and the secondary mold assembly (430) are used to adjust the gradual groove of pipe fittings of different lengths; The pipe stabilization mechanism (500) is used to provide stabilization protection for the grooves of different pipe fittings; The die length adjustment mechanism (600) includes a pressure-bearing crossbar (610) disposed in the main die assembly (410) and the sub-die assembly (430) and a pad (630) disposed in the sub-die assembly (430) and mounted on the pressure-bearing crossbar (610). The outer end of the pad (630) is provided with two limiting plates (650).

2. The large-diameter steel pipe grooving machine according to claim 1, characterized in that, The main mold assembly (410) includes a main base (411), and two positioning grooves (413) are provided at the outer end of the main base (411). A baffle pad (412) is installed on the top of the main base (411), and a main pressure column (414) is provided inside the main base (411). Two first springs (416) are symmetrically distributed inside the main pressure column (414) and the main base (411). The inner end of the main base (411) is provided with a first mold (415). The sub-mold assembly (430) includes a sub-base (431), and a sub-pressure column (432) is provided inside the sub-base (431). The sub-pressure column (432) has two arc grooves (433) inside. The secondary pressure column (432) and the secondary base (431) are provided with two symmetrically distributed second springs (435). The inner end of the sub-base (431) is provided with a second mold (434).

3. The large-diameter steel pipe grooving machine according to claim 1, characterized in that, The tube stabilization mechanism (500) includes a positioning head (510), the inner end of which is provided with a head, and the top and bottom of the positioning head (510) are provided with a plurality of evenly distributed screw holes. The outer end of the positioning column head (510) is provided with a beam (520), and the top and bottom of the beam (520) are provided with transverse grooves; A plug (530) is provided at the other end of the beam (520); The beam (520) is provided with a plurality of sliding sleeves (540) on its outside, and a grinding wheel (550) is provided on the outside of the sliding sleeves (540). The grinding wheel (550) has burrs on its side to increase frictional resistance.

4. A large-diameter steel pipe grooving machine according to claim 1, characterized in that, The outer wall of the pressure-bearing crossbar (610) is provided with two symmetrically distributed slides (620), and the end of the pressure-bearing crossbar (610) that extends to the outside of the pad (630) is provided with an insertion hole (670). A pin (680) is provided inside the socket (670) and at the other end of the pressure-bearing crossbar (610). The top and bottom of the pad (630) are both fitted with first bolts (640); A second bolt (660) is provided inside both of the limiting plates (650).

5. A large-diameter steel pipe grooving machine according to claim 1, characterized in that, The slot pitch adjustment mechanism (400) also includes two first latches (420), two second latches (440), and two third bolts (470). The two first buckles (420) are used to secure the stacked main base (411) and the first mold (415); The two second buckles (440) are used to secure the stacked sub-base (431) and the second mold (434).

6. A large-diameter steel pipe grooving machine according to claim 5, characterized in that, The inner spacer plate (450) and the third bolt (470) are both made of stainless steel. The inner spacer plate (450) has multiple equally spaced sockets inside, while the third bolt (470) has threaded slots that are adapted to match the sockets. The two third bolts (470) are respectively set in the threaded slots of the two outer spacer plates (460).

7. A large-diameter steel pipe grooving machine according to claim 1, characterized in that, The assembly mechanism (300) includes a pad (310), an outer column head (320) is provided at the outer end of the pad (310), an inner column head (330) is provided at the inner end of the pad (310), and two symmetrically distributed buckle plates (340) are provided at the inner end of the pad (310). Multiple combination bolts (350) are provided between the pad (310) and the main base (411).

8. A large-diameter steel pipe grooving machine according to claim 1, characterized in that, The pre-compression assembly (100) includes a clamping fixture (110) mounted on an external machine tool. The clamping fixture (110) has a vertical groove inside, and a groove pressing wheel (120) for the pre-compression steel pipe (200) is provided in the vertical groove. The groove pressing wheel (120) is mounted on an external hydraulic device.

9. A large-diameter steel pipe grooving machine according to claim 7, characterized in that, The inner column head (330) has a hole adapted to be connected to the column head of the pressure-bearing crossbar (610), and two other pins (680) installed on the inner column head of the pressure-bearing crossbar (610) pass through two through holes inside the inner column head (330).

10. A large-diameter steel pipe grooving machine according to claim 2, characterized in that, The main pressure column (414) and the auxiliary pressure column (432) are each provided with two symmetrically distributed main T-shaped sliders on their exteriors; The inner walls of both the main pressure column (414) and the auxiliary pressure column (432) are provided with two auxiliary T-shaped sliders; Two of the main T-shaped sliders are fitted into the grooves on the inner walls of the main base (411) and the first mold (415), and the other two main T-shaped sliders are fitted into the grooves on the inner walls of the secondary base (431) and the second mold (434). Furthermore, the two sets of T-shaped sliders are fitted and installed in two slides (620).

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