Automatic punching equipment and method for long hollow steel pipe

Abstract

The present invention relates to the field of metal processing technology, and specifically discloses an automatic punching device and method for a long hollow steel pipe. The present invention mainly cooperates with a bottom mold, a positioning slide rail, a guide rod and a side limit assembly to perform corresponding limit work on the steel pipe during processing to ensure its processing stability; furthermore, the set core assembly ensures that the steel pipe will not be dented during the punching process, thereby improving its processing quality, and can be replaced according to different types of steel pipes to enhance the flexibility of steel pipe stamping work. The set connecting assembly can realize quick disassembly and assembly of the core assembly on the one hand, which is convenient for subsequent maintenance work, and can realize switching of the first core assembly, the second core assembly and the adjustable core assembly on the other hand.

Description

Technical Field

[0001] The invention relates to the technical field of metal processing, in particular to an automatic punching device and method for a long hollow steel pipe. Background Art

[0002] The punching machine is a mechanical device that installs the raw materials, drives the power mechanism, and acts on the materials with the punching die to complete the punching. The punching machine can perform operations such as sheet processing, stamping, molding, embossing, etc. to force metal into the die.

[0003] A Chinese patent document with prior art announcement number CN210586653U and publication date 20200522 discloses a punching device for a square tube punching machine, which mainly improves and optimizes the square tube punching device; the punching device for a square tube punching machine is provided with a top punching machine, a bottom punching machine, a left punching machine, and a right punching machine, which can punch holes in the square tube on four sides; the punching device is provided with a guide rod, one end of the guide rod is provided with a conical guide part, and the middle part of the guide rod is provided with an annular lubrication groove and two paths, which can ensure that the punching movement is light and straight; the punching device is connected to a plate and a pressure plate, one end of the guide rod is provided with a connecting positioning part, and a ring boss is provided at the connection with the connecting positioning part, and a cylinder bracket is provided between the bottom punching machine and the frame for easy assembly; the punching device for a square tube punching machine has a scientific and reasonable structural design, has the advantages of convenient assembly, stable and light movement, and can punch holes in the square tube from four sides, and is a punching device for a square tube punching machine with high innovation.

[0004] The above scheme and the steel pipe punching equipment under the prior art have corresponding defects in actual use; on the one hand, for the processing of long hollow square steel pipes, the steel pipes are too long and easy to shake, and the staff need to support them with their hands, but the stabilization effect is poor; on the other hand, when punching hollow pipes, the surface of the steel pipes is easy to sag downward, causing bending deformation, thereby affecting the punching quality; furthermore, the circular hollow pipes cannot be punched well; for these problems, the corresponding solutions under the prior art are provided on the punching processing platform, a corresponding die core is provided in the punching die, and a guide rod is provided at one end of the die core to prevent the steel pipe from tilting during the processing, and then the feed amount of the steel pipe is controlled by the corresponding servo control equipment, and the staff only needs to hold the other end of the steel pipe to ensure the punching accuracy of the steel pipe; this process does not have a corresponding limit auxiliary mechanism at the punching position of the steel pipe, and can only process one type of steel pipe, which is more difficult for punching square steel pipes and hollow round pipes of different types, and the working flexibility is not high, which cannot meet the actual use requirements of steel pipe punching processing. Summary of the invention

[0005] The object of the present invention is to provide an automatic punching device and method for a long hollow steel pipe to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an automatic punching device for a long hollow steel pipe, comprising a punching device workbench, a bottom die, a pressing die, a positioning slide rail, a guide rod, and a pushing control device, wherein the punching device workbench is fixedly provided with a positioning slide rail, a bottom die is movably provided on the positioning slide rail, and positioning circular grooves are symmetrically provided on both sides of the bottom die, threaded holes are symmetrically provided on both sides of the positioning slide rail, the threaded holes are threadedly connected with positioning screws, and the positioning screws are clamped with the positioning circular grooves, the bottom die is fixed by the positioning screws, the pressing die is provided at a position directly above the bottom die, and side limit accessories are symmetrically provided on both sides of the bottom die;

[0007] The bottom mold is provided with a core assembly, which is fixedly connected to one end of a guide rod through a connecting assembly. The guide rod is arranged through the push control device, and the other end is fixedly arranged on the support body.

[0008] The side limit fittings include a side limit fitting, a box body, a side through groove, a positioning plate, a movable limit body, an auxiliary spring, a guide ramp, and an auxiliary ball;

[0009] The connection assembly comprises a fixing ring, a docking slot, a docking plug block, a connecting column, and an internal thread stabilizing tube.

[0010] Preferably, the side through grooves are symmetrically arranged on both sides of the bottom mold, and positioning plates are symmetrically fixedly arranged on both sides of the box body, and the positioning plates are fixed to the side positions of the side through grooves by screws, and a movable limiting body is movably arranged in the box body, and the movable limiting body extends into the bottom mold through the side through grooves, an auxiliary spring is fixedly arranged at one end of the movable limiting body, and the other end of the auxiliary spring is fixedly arranged in the box body, a guide slope is arranged on one side of the other end of the movable limiting body, and auxiliary balls are equidistantly and movably embedded on the end face of the movable limiting body and the guide slope.

[0011] Preferably, four movable limiting bodies are symmetrically arranged.

[0012] Preferably, the fixing ring is fixedly arranged on the outer wall of one end of the guide rod, and the outer wall of one end of the guide rod is provided with a connecting thread, the docking slot is arranged on the end face of one end of the guide rod, and the docking slot is adapted to be plugged with a docking block, the docking block is fixedly arranged on the end of the connecting column, an internal threaded stabilizing tube is threadedly connected to the connecting column, and anti-slip protrusions are equidistantly fixed on the outer wall of the internal threaded stabilizing tube.

[0013] Preferably, for the punching processing of square hollow tubes, a first core mold assembly is selected, wherein the first core mold assembly includes a first core mold and a first punching auxiliary groove. The first core mold is rectangular, and a connecting column is fixedly provided at one end of the first core mold, and first punching auxiliary grooves are equidistantly provided on the first core mold.

[0014] Preferably, for the punching process of the circular hollow tube, a second core mold assembly is selected, wherein the second core mold assembly includes a second core mold and a second punching auxiliary groove, the second core mold is cylindrical, and the second core mold is symmetrically provided with the second punching auxiliary groove.

[0015] Preferably, the diameters of the second punching auxiliary groove and the first punching auxiliary groove are set to be equal, and both correspond to the setting positions of the punching holes on the bottom mold and have the same number of setting groups.

[0016] Preferably, for selecting an adjustable core mold assembly, the adjustable core mold assembly includes a support body, a third punching auxiliary groove, a threaded groove, a fixing tube, an adjusting stud, a connecting slot, a first magnet sheet, a connecting plug, a second magnet sheet, a flat plate, an arc plate, a fourth punching auxiliary groove, and a locking screw. The support body is fixedly arranged at one end of the connecting column, and the third punching auxiliary groove is symmetrically arranged on the support body, the threaded groove is symmetrically arranged on the support body, and a fixing tube is fixedly arranged at the slot position, and a locking screw is arranged on the side thread connection of the fixing tube, and the adjusting stud and the screw The grooves are adapted for threaded connection, and a connecting slot is provided on the end face of one end of the regulating stud, a first magnet sheet is fixedly provided in the connecting slot, a connecting block is adapted to be plugged in the connecting slot, the connecting block is symmetrically fixed on one side of the flat plate, and a second magnet sheet is fixedly provided on the end face of one end of the connecting block, the second magnet sheet corresponds to the first magnet sheet in position and is provided in the same number of groups, and the two attract each other, and a fourth punching auxiliary slot is symmetrically provided on the flat plate, and the fourth punching auxiliary slot corresponds to the third punching auxiliary slot in position and is provided in the same number of groups.

[0017] Preferably, the flat plate in the adjustable core assembly is used for punching square hollow tubes. When punching circular hollow tubes, the flat plate can be replaced with an arc-shaped plate, that is, the outer wall of the arc-shaped plate is adapted to fit the inner wall of the circular hollow tube; the arc-shaped plate is also symmetrically provided with a fourth punching auxiliary groove, and the inner wall of the arc-shaped plate is symmetrically fixed with connecting plugs.

[0018] A method for automatically punching a long hollow steel pipe, the operating method comprising the following steps:

[0019] S1: When the long hollow steel pipe punching equipment designed in the present invention is working, the hollow steel pipe is passed through the bottom die, and the steel pipe passes through the core assembly and moves forward along the guide rod until it reaches the position of the push control device. Then, the steel pipe is pushed by the push control device, and then the steel pipe is punched by pressing the die downward. The worker holds the other end of the steel pipe by hand until the processing is completed, and then the steel pipe can be pulled out. During this processing, the bottom die is limited by the movable limiting bodies on both sides of the bottom die to ensure the normal punching of the steel pipe, and the core assembly is set to ensure that no dents will occur during the punching process, thereby ensuring the processing quality. In the actual processing process, the core assembly can be replaced, which is achieved by the connection assembly set;

[0020] S2: The core assembly is set to ensure that the steel pipe will not be dented during the punching process, and can be replaced according to different types of steel pipes, that is, the first core assembly, the second core assembly and the adjustable core assembly are used in a coordinated manner to meet the actual punching processing needs.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention mainly uses the coordinated use of the set bottom mold, positioning slide rail, guide rod and side limit assembly, which can perform corresponding limiting work on the steel pipe during processing to ensure its processing stability; furthermore, the set core assembly ensures that the steel pipe will not be dented during the punching process, thereby improving its processing quality, and can be replaced according to different types of steel pipes, that is, the first core assembly, the second core assembly and the adjustable core assembly are used in a coordinated manner to improve the flexibility of steel pipe stamping work. The set connecting assembly can realize quick disassembly and assembly of the core assembly on the one hand, which is convenient for subsequent maintenance work, and on the other hand, it can realize switching of the first core assembly, the second core assembly and the adjustable core assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the left structural connection of the invented long hollow steel pipe automatic punching equipment;

[0024] Figure 2 For invention Figure 1 A partial enlarged schematic diagram of the structure connection;

[0025] Figure 3 This is a schematic diagram of the right side structure connection of the invented long hollow steel pipe automatic punching equipment;

[0026] Figure 4 For invention Figure 3 A partial enlarged schematic diagram of the structure connection;

[0027] Figure 5It is a schematic diagram of the connection structure between the bottom mold and the side limit accessories and the mold core assembly;

[0028] Figure 6 For invention Figure 5 A partial enlarged schematic diagram of the structure connection;

[0029] Figure 7 It is a partial cross-sectional view of the connection between the bottom mold and the side limiting accessories and the mold core assembly structure;

[0030] Figure 8 For invention Figure 7 A partial enlarged schematic diagram of the structure connection;

[0031] Fig. 9 It is a schematic diagram of the left side of the partial cross-section of the connection of the side limit fitting structure of the invention;

[0032] Fig.10 It is a schematic diagram of the right side of the partial cross-section of the connection of the side limit fitting structure of the invention;

[0033] Fig.11 This is a schematic diagram of the left side of the connection between the first mold core assembly and the connecting assembly and the guide rod structure of the invention;

[0034] Fig.12 It is a schematic diagram of the right side of the connection between the first mold core assembly and the connecting assembly and the guide rod structure of the invention;

[0035] Fig.13 A schematic diagram of the connection between the second mold core assembly, the connecting assembly and the guide rod structure of the invention;

[0036] Fig.14 The left side schematic diagram of the partial cross-section of the connection between the adjustable mold core assembly and the connecting assembly and the guide rod structure of the invention;

[0037] Fig.15 The right side schematic diagram of the partial cross-section of the connection between the adjustable core assembly and the connecting assembly and the guide rod structure of the invention;

[0038] Fig.16 For invention Fig.15 A partial cross-sectional view of the connection of the middle support structure;

[0039] Fig.17 For invention Fig.15 Enlarged schematic diagram of the middle plate structure connection;

[0040] Fig.18 For invention Fig.15 A partial enlarged schematic diagram of the connection of the central control stud structure;

[0041] Fig.19 The present invention is a schematic diagram of the connection of the arc plate structure in the adjustable core assembly.

[0042] In the figure: punching equipment workbench 1, bottom die 2, pressing die 3, positioning slide rail 4, guide rod 5, push control device 6, support body 7, positioning circular groove 8, threaded hole 9, positioning screw 10, side limit fitting 11, box body 1101, side through groove 1102, positioning plate 1103, movable limit body 1104, auxiliary spring 1105, guide ramp 1106, auxiliary ball 1107, connecting assembly 12, fixing ring 1201, docking slot 1202, docking plug block 1203, connecting column 1204, internal thread stabilizing tube 1205, first Core mold assembly 13, first core mold 1301, first punching auxiliary groove 1302, second core mold assembly 14, second core mold 1401, second punching auxiliary groove 1402, adjustable core mold assembly 15, support body 1501, third punching auxiliary groove 1502, threaded groove 1503, fixing tube 1504, regulating stud 1505, connecting slot 1506, first magnet sheet 1507, connecting plug block 1508, second magnet sheet 1509, flat plate 1510, arc plate 15101, fourth punching auxiliary groove 1511, locking screw 1512. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention are described clearly and completely below. The embodiments of the present invention and all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] Example 1: Please refer to Figure 1-19 , an automatic punching device for a long hollow steel pipe, comprising a punching device workbench 1, a bottom die 2, a pressing die 3, a positioning slide rail 4, a guide rod 5, and a pushing control device 6. The punching device workbench 1 is fixedly provided with a positioning slide rail 4, the bottom die 2 is movably provided on the positioning slide rail 4, and the bottom die 2 is symmetrically provided with positioning circular grooves 8 on both sides, and the positioning slide rail 4 is symmetrically provided with threaded holes 9 on both sides, the threaded holes 9 are threadedly connected with positioning screws 10, and the positioning screws 10 are clamped with the positioning circular grooves 8, the bottom die 2 is fixed by the positioning screws 10, the pressing die 3 is arranged at a position directly above the bottom die 2, and the bottom die 2 is symmetrically provided with side limit accessories 11 on both sides;

[0045] The bottom mold 2 is provided with a core assembly, which is fixedly connected to one end of the guide rod 5 through a connecting assembly 12. The guide rod 5 is arranged through the push control device 6, and the other end is fixedly arranged on the support body 7.

[0046] The side limiting accessory 11 comprises a side limiting accessory 11, a box body 1101, a side through groove 1102, a positioning plate 1103, a movable limiting body 1104, an auxiliary spring 1105, a guide slope 1106, and an auxiliary ball 1107;

[0047] The connection assembly 12 includes a fixing ring 1201 , a docking slot 1202 , a docking plug block 1203 , a connecting column 1204 , and an internally threaded stabilizing tube 1205 .

[0048] The side through grooves 1102 are symmetrically arranged on both sides of the bottom mold 2, and positioning plates 1103 are symmetrically fixedly arranged on both sides of the box body 1101. The positioning plates 1103 are fixed to the side positions of the side through grooves 1102 by screws, and a movable limiting body 1104 is movably arranged in the box body 1101. The movable limiting body 1104 extends through the side through grooves 1102 to the bottom mold 2, and an auxiliary spring 1105 is fixedly arranged at one end of the movable limiting body 1104, and the other end of the auxiliary spring 1105 is fixedly arranged in the box body 1101, and a guide slope 1106 is arranged on one side of the other end of the movable limiting body 1104, and auxiliary balls 1107 are equidistantly and movably embedded on the end face of the movable limiting body 1104 and the guide slope 1106.

[0049] Four movable limiting bodies 1104 are symmetrically arranged.

[0050] The fixing ring 1201 is fixedly set on the outer wall of one end of the guide rod 5, and the outer wall of one end of the guide rod 5 is provided with a connecting thread, the docking slot 1202 is set on the end face of one end of the guide rod 5, and the docking slot 1202 is adapted to be plugged with a docking block 1203, the docking block 1203 is fixedly set on the end of the connecting column 1204, and an internal threaded stabilizing tube 1205 is threadedly connected to the connecting column 1204, and anti-slip bumps are fixedly set on the outer wall of the internal threaded stabilizing tube 1205 at equal intervals.

[0051] When the long hollow steel pipe punching device designed by the present invention is working, the hollow steel pipe is passed through the bottom mold 2. First, the head of the steel pipe is guided by the guide slope 1106 at the end of the movable limit body 1104, and the movable limit body 1104 is squeezed to both sides, that is, the movable limit body 1104 is pressed into the box body 1101. At the same time, the auxiliary spring 1105 is in a compressed state. The auxiliary ball 1107 arranged on the end of the movable limit body 1104 and the guide slope 1106 is used to improve the convenience of pulling and inserting the steel pipe, and to improve the control of the movable limit body. 1104 The convenience of extrusion; the steel pipe passes through the core mold assembly and moves forward along the guide rod 5 until it reaches the position of the push control device 6. Then, the steel pipe is pushed by the push control device 6, and then the die 3 is pressed down to punch the steel pipe. The staff holds the other end of the steel pipe by hand until the processing is completed, and then the steel pipe can be pulled out. During this processing, the bottom mold 2 is limited by the movable limiting bodies 1104 on both sides to ensure the normal punching of the steel pipe, and the core mold assembly is set to ensure that no depressions will occur during the punching process, thereby ensuring its processing quality.

[0052] In the actual processing, the core assembly can be replaced. During the replacement process, first loosen the positioning screw 10 so that the positioning screw 10 is separated from the positioning circular groove 8 on the side of the bottom mold 2, release the fixation of the bottom mold 2, and then pull the bottom mold 2 outward until the core assembly is exposed; then loosen the internal thread stabilizing tube 1205 and rotate it to the initial position, release the connection between the connecting column 1204 and the guide rod 5, and then separate the docking block 1203 from the docking slot 1202. , replace another core component. For its installation and fixation, first insert the docking block 1203 into the docking slot 1202, and then rotate the internal threaded stabilizing tube 1205 to move the internal threaded stabilizing tube 1205 to the connecting position of the connecting column 1204 and the guide rod 5, and fix the two together, and then tighten the internal threaded stabilizing tube 1205 to make one end of the internal threaded stabilizing tube 1205 press against the fixing ring 1201; finally, reset the bottom mold 2 and use the positioning screw 10 to position it.

[0053] Example 2: Based on Example 1, please refer to Figure 11-12 For the punching processing of the square hollow tube, the first core mold component 13 is selected. The first core mold component 13 includes a first core mold 1301 and a first punching auxiliary groove 1302. The first core mold 1301 is rectangular, and a connecting column 1204 is fixedly provided at one end of the first core mold 1301. The first core mold 1301 is provided with first punching auxiliary grooves 1302 at equal intervals.

[0054] The steel pipe passes through the first mold core 1301, and the inner wall of the steel pipe fits with the first mold core 1301. When punching, it can avoid the position of the side of the hole after punching to be concave.

[0055] Example 3: Based on Example 2, please refer to Fig.13 For the punching process of the circular hollow tube, the second core mold assembly 14 is selected. The second core mold assembly 14 includes a second core mold 1401 and a second punching auxiliary groove 1402. The second core mold 1401 is cylindrical, and the second core mold 1401 is symmetrically provided with the second punching auxiliary groove 1402.

[0056] The diameters of the second punching auxiliary groove 1402 and the first punching auxiliary groove 1302 are set to be equal, and both correspond to the setting positions of the punching holes on the bottom mold 2 and have the same number of setting groups.

[0057] The steel pipe passes through the second mold core 1401, and the inner wall of the circular hollow steel pipe fits with the outer wall of the second mold core 1401, so that when punching, the position of the side of the hole after punching can be avoided from being concave.

[0058] Example 4: Based on Example 3, please refer to Figure 14-19For the use of the adjustable core assembly 15, the adjustable core assembly 15 includes a support body 1501, a third punching auxiliary groove 1502, a threaded groove 1503, a fixing tube 1504, a regulating stud 1505, a connecting slot 1506, a first magnet sheet 1507, a connecting plug 1508, a second magnet sheet 1509, a flat plate 1510, an arc plate 15101, a fourth punching auxiliary groove 1511, and a locking screw 1512. The support body 1501 is fixedly arranged at one end of the connecting column 1204, and the third punching auxiliary groove 1502 is symmetrically arranged on the support body 1501, and the threaded groove 1503 is symmetrically arranged on the support body 1501, and the fixing tube 1504 is fixedly arranged at the notch position, and the side thread connection of the fixing tube 1504 is provided with a locking screw 1512 The regulating stud 1505 is threadedly connected with the thread groove 1503, and a connecting slot 1506 is arranged on the end face of one end of the regulating stud 1505, a first magnet piece 1507 is fixedly arranged in the connecting slot 1506, a connecting block 1508 is arranged in the connecting slot 1506, and the connecting block 1508 is symmetrically fixed on one side of the flat plate 1510, and a second magnet piece 1509 is fixedly arranged on the end face of one end of the connecting block 1508, the second magnet piece 1509 corresponds to the first magnet piece 1507 in position and has the same number of groups, and the two attract each other, and a fourth punching auxiliary slot 1511 is symmetrically arranged on the flat plate 1510, and the fourth punching auxiliary slot 1511 corresponds to the third punching auxiliary slot 1502 in position and has the same number of groups.

[0059] The flat plate 1510 in the adjustable core assembly 15 is used for punching square hollow tubes. When punching circular hollow tubes, the flat plate 1510 can be replaced with an arc plate 15101, that is, the outer wall of the arc plate 15101 is adapted to fit the inner wall of the circular hollow tube; the arc plate 15101 is also symmetrically provided with a fourth punching auxiliary groove 1511, and the inner wall of the arc plate 15101 is symmetrically fixed with a connecting plug 1508.

[0060] In addition to replacing different core assemblies, a core assembly that can be adjusted according to the actual steel pipe model can also be used, that is, by adjusting the adjustment stud 1505, the position of the flat plate 1510 or the curved plate 15101 can be adjusted until it can be matched with the inner wall of the steel pipe. In this process, the curved plate 15101 and the flat plate 1510 can also be replaced to process steel pipes of different models. Both are connected by connecting the plug block 1508 and the connecting slot 1506 at the end of the adjusting stud 1505. Plug connection, and then fix it by the mutual attraction between the first magnet sheet 1507 and the second magnet sheet 1509; after adjusting the position of the arc plate 15101 or the flat plate 1510, tighten the locking screw 1512 so that the locking screw 1512 squeezes the side wall of the regulating stud 1505, so that the position of the regulating stud 1505 is locked, thereby ensuring the stability of the position after adjustment; and the adjustable core assembly 15 is also fixedly connected to the guide rod 5 through the connecting assembly 12, which is convenient for subsequent maintenance and replacement.

[0061] 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. An automatic punching device for a long hollow steel pipe, comprising a punching device workbench (1), a bottom die (2), a pressing die (3), a positioning slide rail (4), a guide rod (5), and a pushing control device (6), wherein the punching device workbench (1) is fixedly provided with a positioning slide rail (4), the bottom die (2) is movably provided on the positioning slide rail (4), and positioning circular grooves (8) are symmetrically provided on both sides of the bottom die (2), threaded holes (9) are symmetrically provided on both sides of the positioning slide rail (4), the threaded holes (9) are threadedly connected with positioning screws (10), and the positioning screws (10) are snap-fitted with the positioning circular grooves (8), the bottom die (2) is fixed by the positioning screws (10), the pressing die (3) is arranged at a position directly above the bottom die (2), and side limit fittings (11) are symmetrically provided on both sides of the bottom die (2); Features: The bottom mold (2) is provided with a core assembly, which is fixedly connected to one end of a guide rod (5) via a connecting assembly (12); the guide rod (5) is arranged to penetrate the push control device (6), and the other end is fixedly arranged on a support body; The side limiting accessory (11) comprises a box body (1101), a side through slot (1102), a positioning plate (1103), a movable limiting body (1104), an auxiliary spring (1105), a guide slope (1106), and an auxiliary ball (1107); the side through slot (1102) is symmetrically arranged on both sides of the bottom mold (2); the positioning plates (1103) are symmetrically fixedly arranged on both sides of the box body (1101); the positioning plates (1103) are fixed to the side positions of the side through slot (1102) by screws, and the box body (1101) is provided with a plurality of guide plates (1103) on the bottom mold (2); A movable limiting body (1104) is movably provided, and the movable limiting body (1104) extends through the side through slot (1102) to the bottom mold (2); an auxiliary spring (1105) is fixedly provided at one end of the movable limiting body (1104); the other end of the auxiliary spring (1105) is fixedly provided in the box body (1101); a guide slope (1106) is provided on one side of the other end of the movable limiting body (1104); and auxiliary balls (1107) are equidistantly and movably embedded on the end surface of the movable limiting body (1104) and the guide slope (1106).

2. The automatic punching device for a long hollow steel pipe according to claim 1, characterized in that: The connection assembly (12) comprises a fixing ring (1201), a docking slot (1202), a docking plug (1203), a connection column (1204), and an internally threaded stabilizing tube (1205); the fixing ring (1201) is fixedly arranged on the outer side wall of one end of the guide rod (5), and the outer side wall of one end of the guide rod (5) is provided with a connecting thread; the docking slot (1202) is arranged on the end face of one end of the guide rod (5), and the docking plug (1203) is adapted to be plugged in the docking slot (1202); the docking plug (1203) is fixedly arranged on the end of the connection column (1204); an internally threaded stabilizing tube (1205) is threadedly arranged on the connection column (1204), and anti-slip bumps are fixedly arranged on the outer side wall of the internally threaded stabilizing tube (1205) at equal intervals.

3. The automatic punching device for a long hollow steel pipe according to claim 2, characterized in that: Four movable limiting bodies (1104) are symmetrically arranged.

4. The automatic punching device for a long hollow steel pipe according to claim 3, characterized in that: For punching processing of a square hollow tube, a first mold core assembly (13) is selected. The first mold core assembly (13) comprises a first mold core (1301) and a first punching auxiliary groove (1302). The first mold core (1301) is rectangular, and a connecting column (1204) is fixedly provided at one end of the first mold core (1301). The first punching auxiliary grooves (1302) are equidistantly provided on the first mold core (1301).

5. The automatic punching device for a long hollow steel pipe according to claim 4, characterized in that: For punching processing of a circular hollow tube, a second mold core assembly (14) is selected. The second mold core assembly (14) includes a second mold core (1401) and a second punching auxiliary groove (1402). The second mold core (1401) is cylindrical, and the second punching auxiliary groove (1402) is symmetrically arranged on the second mold core (1401).

6. The automatic punching device for a long hollow steel pipe according to claim 5, characterized in that: The second punching auxiliary groove (1402) and the first punching auxiliary groove (1302) are both set with the same diameter, and both correspond to the setting positions of the punching holes on the bottom mold (2) and have the same number of setting groups.

7. The automatic punching device for a long hollow steel pipe according to claim 6, characterized in that: An adjustable core assembly (15) is provided, the adjustable core assembly (15) comprising a support body (1501), a third punching auxiliary groove (1502), a threaded groove (1503), a fixing tube (1504), a regulating stud (1505), a connecting slot (1506), a first magnet sheet (1507), a connecting plug (1508), a second magnet sheet (1509), a flat plate (1510), an arc plate (15101), a fourth punching auxiliary groove (1511), and a locking screw (1512), the support body (1501) being fixedly provided at one end of the connecting column (1204), and the third punching auxiliary groove (1502) being symmetrically provided on the support body (1501), the threaded groove (1503) being symmetrically provided on the support body (1501), and a fixing tube (1504) being fixedly provided at the slot position, and a locking screw (1512) being provided on the side thread connection of the fixing tube (1504) 1512), the regulating stud (1505) is threadedly connected with the thread groove (1503), and the end surface of one end of the regulating stud (1505) is provided with a connecting slot (1506), a first magnet sheet (1507) is fixedly provided in the connecting slot (1506), a connecting plug block (1508) is plugged and provided in the connecting slot (1506), the connecting plug block (1508) is symmetrically fixedly provided on one side of the plate (1510), and a second magnet sheet (1509) is fixedly provided on the end surface of one end of the connecting plug block (1508), the second magnet sheet (1509) and the first magnet sheet (1507) are arranged at corresponding positions and are arranged in the same number of groups, and the two attract each other, and the plate (1510) is symmetrically provided with a fourth punching auxiliary slot (1511), and the fourth punching auxiliary slot (1511) and the third punching auxiliary slot (1502) are arranged at corresponding positions and are arranged in the same number of groups.

8. The automatic punching device for a long hollow steel pipe according to claim 7, characterized in that: The flat plate (1510) in the adjustable core assembly (15) is used for punching square hollow tubes. When punching circular hollow tubes, the flat plate (1510) is replaced with an arc-shaped plate (15101), and the outer wall of the arc-shaped plate (15101) fits and fits the inner wall of the circular hollow tube. The arc-shaped plate (15101) is also symmetrically provided with a fourth punching auxiliary groove (1511), and the inner wall of the arc-shaped plate (15101) is symmetrically fixed with a connecting plug (1508).

9. A method for operating an automatic punching device for a long hollow steel pipe as claimed in claim 8, characterized in that: The operation method includes the following steps: S1: The hollow steel pipe is passed through the bottom die (2), and the steel pipe passes through the core die assembly and moves forward along the guide rod (5) until it reaches the position of the push control device (6). The steel pipe is then pushed by the push control device (6), and then the steel pipe is punched by pressing the die (3). The worker holds the other end of the steel pipe by hand until the processing is completed, and then the steel pipe is pulled out. During this processing, the bottom die (2) is limited by movable limit bodies (1104) arranged on both sides to ensure the normal punching of the steel pipe. The core die assembly is arranged to ensure that no dents will occur during the punching process, thereby ensuring the processing quality. In the actual processing process, the core die assembly can be replaced, which is achieved by the connection assembly (12). S2: The core assembly is provided to ensure that the steel pipe will not be dented during the punching process, and can be replaced according to different types of steel pipes, that is, the first core assembly (13), the second core assembly (14) and the adjustable core assembly (15) are used in a coordinated manner to meet the actual punching processing requirements.

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