CN211516464U

CN211516464U - Square pipe type workpiece iron sheet welding mechanism

Info

Publication number: CN211516464U
Application number: CN201922179085.5U
Authority: CN
Inventors: 李俊利; 康艳洁
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-12-06
Filing date: 2019-12-06
Publication date: 2020-09-18
Anticipated expiration: 2029-12-06

Abstract

The utility model discloses a square pipe type work piece iron sheet welding mechanism, include: the rack is internally provided with an obliquely arranged mounting plate; the workpiece positioning device is obliquely arranged on the mounting plate and comprises first supporting seats arranged at intervals, two groups of first positioning assemblies for positioning the square tubular workpiece, a second supporting seat and a second positioning assembly, wherein each first supporting seat is respectively provided with one group of first positioning assemblies; welding set, including two sets of first welding set and two sets of second welding subassemblies, each first welding set of group includes two along the first welding subassemblies that X set up to the interval, is equipped with a set of second welding subassembly between two first welding subassemblies. The utility model discloses a square pipe type work piece iron sheet welding mechanism can fix a position other side cast work piece fast to can with all treat welded iron sheet disposable welding on square pipe type work piece, can take out fast after the welding is accomplished, improved the welding efficiency of square pipe type work piece and iron sheet, reduced manufacturing cost.

Description

Square pipe type workpiece iron sheet welding mechanism

Technical Field

The utility model relates to the field of welding technique, concretely relates to square pipe type work piece iron sheet welding mechanism.

Background

Computer tables, desks and the like are used as furniture for daily life and office work, generally, a square tube is used as a connecting piece, a small iron sheet with a connecting hole is welded on the square tube, a wood plate is used as a panel, and the small iron sheet and the panel are connected through screws so as to complete the assembly of the table.

In the prior art, a plurality of small iron sheets are sequentially welded on a square tube by adopting a welding tool, so that time is consumed, and the welding quality is difficult to ensure, thereby improving the production cost of various tables such as computer tables, desks and the like.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a square pipe type work piece iron sheet welding mechanism can fix a position fast to the square pipe type work piece to can with all treat the disposable welding of welded iron sheet on the square pipe type work piece, can take out fast after the welding is accomplished, improved the welding efficiency of square pipe type work piece and iron sheet, reduced the manufacturing cost of the desk of using this work piece.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a square pipe type work piece iron sheet welding mechanism, includes:

the device comprises a rack, a supporting frame and a positioning mechanism, wherein one side of the rack is provided with an opening, and an installing plate which is obliquely arranged is installed in the rack;

a workpiece positioning device obliquely disposed on the mounting plate, the workpiece positioning device having a lower side adjacent the rack opening and an upper side opposite the lower side; the workpiece positioning device comprises first supporting seats arranged at intervals, two groups of first positioning assemblies for positioning the upper side and the lower side of the square tubular workpiece, a second supporting seat arranged between the two first supporting seats at intervals and a second positioning assembly arranged on the second supporting seat, wherein each first supporting seat is respectively provided with one group of first positioning assemblies, and the first positioning assemblies and the second positioning assemblies can clamp the square tubular workpiece and tightly press the square tubular workpiece on the first supporting seats and the second supporting seats;

welding set, including two sets of be close to respectively work piece positioner's upside, downside set up in first welding set and two sets of second welding subassembly on the mounting panel, each group first welding set includes two along X to the first welding subassembly of interval setting, two be equipped with a set ofly between the first welding subassembly the second welding subassembly.

As a preferred scheme of the square tube type workpiece iron sheet welding mechanism, the first positioning assembly comprises a plurality of welding positioning blocks which are arranged at intervals along the length of the first support seat and serve as electrodes, a plurality of first pressing blocks which are arranged on the first support seat at intervals, and a first pressing cylinder which can drive the first pressing blocks to rotate and lift, the first support seat is provided with a first placing position which is positioned on one side of the welding positioning block, which is close to the other first support seat, and is used for placing a square tube type workpiece, and the first pressing cylinder can drive the first pressing blocks to selectively rotate to the first placing position and press the square tube type workpiece positioned at the first placing position;

the second positioning assembly comprises two groups of first positioning cylinders which are arranged on the second supporting seat and are opposite to the welding positioning blocks, a first conductive pressing block connected with an output shaft of the first positioning cylinders, two groups of second positioning cylinders which are positioned at two ends of the second supporting seat along the length direction of the second supporting seat, and a second conductive pressing block connected with an output shaft of the second positioning cylinders, the first conductive pressing block is opposite to a square tube type workpiece positioned on a first placing position, the two second conductive pressing blocks are positioned between the two groups of second positioning cylinders, and each group of first positioning cylinders can tightly abut the square tube type workpiece to abut against the welding positioning blocks;

the distance between the square tube type workpiece arranged on the first placing position and the second supporting seat is not less than the length of the iron sheet to be welded to the square tube type workpiece.

As an optimal scheme of the square pipe type workpiece iron sheet welding mechanism, the second positioning assembly further comprises a second positioning cylinder which is arranged right opposite to the second pressing block on the second supporting seat and a second pressing cylinder which can drive the second pressing block to rotate and lift, a second placing position used for placing the square pipe type workpiece is arranged between the second pressing block and the second positioning cylinder, and the second pressing cylinder can drive the second pressing block to rotate to the second placing position and press the square pipe type workpiece on the second placing position.

As an optimal scheme of the square pipe type workpiece iron sheet welding mechanism, the second positioning assembly further comprises two groups of first positioning blocks which are respectively adjacent to one of the second positioning cylinders and are arranged on the second supporting seat, each group of first positioning blocks comprises two first positioning blocks which are respectively positioned on two sides of the second positioning cylinder, and the first positioning blocks are positioned between the second pressing block and the second positioning cylinders.

As an optimal scheme of the square pipe type workpiece iron sheet welding mechanism, the second positioning assembly further comprises two sets of third positioning cylinders which are arranged on the second supporting seat and respectively located between the second pressing block and the first positioning cylinders, a third conductive pressing block connected with an output shaft of the third positioning cylinders, and two sets of second positioning blocks which are adjacent to one another respectively, wherein the third positioning cylinders are arranged on the second supporting seat, each set of second positioning blocks comprises two second positioning blocks which are respectively located on two sides of the third positioning cylinders, and the second positioning blocks are located between the third positioning cylinders and the first positioning cylinders.

As an optimal selection scheme of square pipe type work piece iron sheet welding mechanism, first supporting seat is including being used for location square pipe type work piece and installation first locating seat, the being fixed in of first compressing tightly the cylinder the electrically conductive copper platform of first locating seat top with be located first locating seat both ends and with the first electrically conductive copper that electrically conductive copper platform is connected, the welding position piece with one side contact of electrically conductive copper platform, the upper surface of first locating seat with the upper surface parallel and level of second supporting seat.

As an optimal scheme of square pipe type work piece iron sheet welding mechanism, first welding subassembly include through the mount pad install in welding cylinder on the mounting panel, with welding electrode that welding cylinder connects, be located the iron sheet of welding electrode one side compresses tightly the cylinder and with the iron sheet compresses tightly the iron sheet compact heap that the cylinder is connected, a recess has been seted up and has been fixed in welding electrode's top strong magnet in the recess, the iron sheet compresses tightly the cylinder and can drive the iron sheet compact heap rotates extremely the top of recess compresses tightly iron sheet in the recess, the welding cylinder can drive welding electrode is in along Y on the mounting panel to removing.

As a square pipe type work piece iron sheet welding mechanism's an preferred scheme, first welding subassembly including install in sliding assembly on the mounting panel, sliding assembly include along Y to the interval install in T type groove and guide rail on the mounting panel, T type groove with the length of guide rail all follows X to extending, the mount pad below be provided with guide rail sliding fit's spout and with T type groove grafting complex T type connecting rod.

As an optimal scheme of square pipe type work piece iron sheet welding mechanism, the slip subassembly is still including being located T type groove with adjusting screw between the guide rail, the below of mount pad is equipped with a connecting plate, set up the confession on the connecting plate adjusting screw passes the screw hole, adjusting screw install in on the mounting panel and with adjusting screw thread connects soon.

As an optimal scheme of square pipe type work piece iron sheet welding mechanism, first welding subassembly is still including unsteady joint, fixed plate and the electrically conductive copper of second, the welding cylinder passes through unsteady joint with the fixed plate is connected, the electrically conductive copper of second is located the fixed plate is kept away from one side of unsteady joint, just the welding cylinder still through a plurality of guiding axles with the fixed plate is connected, welding electrode is fixed in on the electrically conductive copper of second.

The utility model has the advantages that: the utility model discloses in, square cast work piece is placed on first supporting seat and second supporting seat and fixed through first locating component and second locating component centre gripping, then welds a plurality of iron sheet on square cast work piece in step through first welding subassembly and second welding subassembly among the welding set, and the mounting panel in the frame adopts the slope setting, can be convenient for get of square cast work piece and put. Compared with the prior art, the utility model discloses a square pipe type work piece iron sheet welding mechanism can fix a position other side cast work piece fast to can with all treat the disposable welding of welded iron sheet on square pipe type work piece, can take out fast after the welding is accomplished, improved the welding efficiency of square pipe type work piece and iron sheet, reduced the manufacturing cost of the desk of using this work piece.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be obtained from these drawings without inventive effort.

Fig. 1 is a schematic structural view of an iron sheet welding mechanism for a square tube-shaped workpiece according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a workpiece positioning device according to an embodiment of the present invention.

Fig. 3 is a side view (a) of a workpiece positioning apparatus according to an embodiment of the present invention.

Fig. 4 is a side view (ii) of a workpiece positioning device according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a welding device according to an embodiment of the present invention.

Fig. 6 is a schematic structural diagram of a first welding assembly according to an embodiment of the present invention.

Fig. 7 is a schematic structural diagram of a second welding assembly according to an embodiment of the present invention.

In the figure:

1. a first support base; 11. a first positioning seat; 12. a conductive copper stage; 13. a first conductive copper plate; 14. a water-cooling block; 2. a first positioning assembly; 21. welding a positioning block; 22. a first compact block; 23. a first hold-down cylinder; 3. a second support seat; 4. a second positioning assembly; 41. a first positioning cylinder; 42. a second positioning cylinder; 43. a second compact block; 44. a second hold-down cylinder; 45. a first positioning block; 46. a third positioning cylinder; 47. a second positioning block; 5. a frame; 6. mounting a plate; 7. a first welded assembly; 71. a mounting seat; 72. welding the cylinder; 73. welding an electrode; 74. an iron sheet pressing cylinder; 75. an iron sheet pressing block; 76. a groove; 77. a sliding assembly; 771. a T-shaped groove; 772. a guide rail; 773. adjusting the screw rod; 78. a floating joint; 79. A second conductive copper plate; 8. a second welded assembly;

100. a square tube-shaped workpiece; 200. iron sheets.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not indicated or implied that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are used only for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms will be understood by those skilled in the art according to the specific circumstances.

In the description of the present invention, unless otherwise explicitly specified or limited, the term "connected" or the like, if appearing to indicate a connection relationship between the components, is to be understood broadly, for example, as being either a fixed connection, a detachable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through one or more other components or may be in an interactive relationship with one another. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, the mechanism for welding iron sheets of square tube-shaped workpieces in the present embodiment is characterized by including:

the device comprises a rack 5, wherein one side of the rack 5 is opened, and an installing plate 6 which is obliquely arranged is installed in the rack 5;

a workpiece positioning device obliquely arranged on the mounting plate 6, the workpiece positioning device having a lower side adjacent to the opening of the frame 5 and an upper side opposite to the lower side; the workpiece positioning device comprises first supporting seats 1 arranged at intervals, two groups of first positioning components 2 used for positioning the upper side and the lower side of a square tubular workpiece 100, a second supporting seat 3 arranged between the two first supporting seats 1 at intervals and a second positioning component 4 arranged on the second supporting seat 3, wherein each first supporting seat 1 is respectively provided with one group of first positioning components 2, and the first positioning components 2 and the second positioning components 4 can clamp the square tubular workpiece 100 and tightly press the square tubular workpiece 100 on the first supporting seats 1 and the second supporting seats 3;

welding set, including two sets of upper sides, the downside that is close to work piece positioner respectively set up first welding set and two sets of second welding set 8 on mounting panel 6, each first welding set of group includes two along X to the first welding set 7 of interval setting, is equipped with a set of second welding set 8 between two first welding sets 7.

In this embodiment, square tubular workpiece 100 is placed on first supporting seat 1 and second supporting seat 3 and fixed through the centre gripping of first locating component 2 and second locating component 4, then welds a plurality of iron sheet 200 on square tubular workpiece 100 in step through first welding subassembly 7 and second welding subassembly 8 among the welding set, and mounting panel 6 on the frame 5 adopts the slope setting, can be convenient for getting of square tubular workpiece 100 and put. Compared with the prior art, the square tube type workpiece iron sheet welding mechanism can quickly position the square tube type workpiece 100, can weld all the iron sheets 200 to be welded on the square tube type workpiece 00 at one time, can be quickly taken out after welding is completed, improves the welding efficiency of the square tube type workpiece 100 and the iron sheets 200, and reduces the production cost of a table using the workpiece.

As shown in fig. 2 to 4, the first positioning assembly 2 includes a plurality of welding positioning blocks 21 arranged at intervals along the length of the first support base 1 and serving as electrodes, a plurality of first pressing blocks 22 arranged at intervals on the first support base 1, and a first pressing cylinder 23 capable of driving the first pressing blocks 22 to rotate and lift, the first support base 1 has a first placing position for placing the square tube type workpiece 100 and located on one side of the welding positioning block 21 close to another first support base 1, and the first pressing cylinder 23 can drive the first pressing blocks 22 to selectively rotate to the first placing position and press the square tube type workpiece 100 located in the first placing position;

the second positioning assembly 4 comprises two groups of first positioning cylinders 41 which are arranged on the second supporting seat 3 and are opposite to the welding positioning blocks 21, a first conductive pressing block connected with an output shaft of the first positioning cylinders 41, two groups of second positioning cylinders 42 positioned at two ends of the second supporting seat 3 along the length direction of the second supporting seat, and a second conductive pressing block connected with an output shaft of the second positioning cylinders 42, wherein the first conductive pressing block is opposite to the square tube-shaped workpiece 100 positioned on the first placing position, the two second conductive pressing blocks are positioned between the two groups of second positioning cylinders 42, and each group of first positioning cylinders 41 can tightly abut the square tube-shaped workpiece 100 against the welding positioning blocks 21;

the distance between the square tube type workpiece 100 placed on the first placing position and the second supporting seat 3 is not less than the length of the iron piece 200 to be welded to the square tube type workpiece 100.

In the present embodiment, one set of the second positioning cylinders 42 and the corresponding second conductive compacts are not shown in the figure. First locating component 2 and second locating component 4 cooperate, can fix a position square cast side's pipe type work piece 100 and be fixed in on first supporting seat 1 and the second supporting seat 3 to weld iron sheet 200 to square cast work piece 100 accurately on, thereby accomplish the preparation of desk connecting piece.

The number of the first pressing blocks 22 is the same as that of the first positioning cylinders 41, and the first pressing blocks 22 are opposite to the first conductive pressing blocks connected with the corresponding first positioning cylinders 41, so that the square pipe type workpiece 100 can be stably placed at the first placing position.

The second positioning assembly 4 further comprises a second pressing block 43 mounted on the second support seat 3 opposite to the second positioning cylinder 42 and a second pressing cylinder 44 capable of driving the second pressing block 43 to rotate and lift, a second placing position for placing the square tube type workpiece 100 is arranged on the second support seat 3 and between the second pressing block 43 and the second positioning cylinder 42, and the second pressing cylinder 44 can drive the second pressing block 43 to rotate to the second placing position and press the square tube type workpiece 100 on the second placing position. For the square pipe-shaped workpiece 100 with a square frame-shaped structure, after the square pipe-shaped workpiece 100 is fixed on the first support seat 1 and the second support seat 3, two opposite sides of the square pipe-shaped workpiece 100 are located at a first placing position on the first support seat 1, and the other two opposite sides are located at a second placing position on the second support seat 3.

The second positioning assembly 4 further includes two sets of first positioning blocks respectively adjacent to one of the second positioning cylinders 42 and mounted on the second supporting seat 3, each set of first positioning blocks includes two first positioning blocks 45 respectively located at two sides of the second positioning cylinder 42, and the first positioning blocks 45 are located between the second pressing block 43 and the second positioning cylinders 42. The position of the square-tube-shaped workpiece 100 can be preliminarily positioned by the second pressing block 43 before the square-tube-shaped workpiece 100 is fixed by the second positioning cylinder 42 and the second pressing block 43.

The present embodiment is optimized based on the above embodiments in order to accommodate the positioning of square tubular workpieces 100 of different sizes and square frame structures. Specifically, the second positioning assembly 4 further includes two sets of third positioning cylinders 46 installed on the second support seat 3 and respectively located between the second pressing block 43 and the first positioning cylinder 41, a third conductive pressing block connected to an output shaft of the third positioning cylinder 46, and two sets of second positioning blocks installed on the second support seat 3 adjacent to one of the third positioning cylinders 46, where each set of second positioning blocks includes two second positioning blocks 47 respectively located on two sides of the third positioning cylinder 46, and the second positioning blocks 47 are located between the third positioning cylinders 46 and the first positioning cylinders 41.

The first supporting seat 1 comprises a first positioning seat 11, a conductive copper platform 12 and a first conductive copper plate 13, wherein the first positioning seat 11 is used for positioning a square tube type workpiece 100 and installing a first pressing cylinder 23, the conductive copper platform 12 is fixed above the first positioning seat 11, the first conductive copper plate 13 is positioned at two ends of the first positioning seat 11 and connected with the conductive copper platform 12, a welding positioning block 21 is in contact with one side of the conductive copper platform 12, and the upper surface of the first positioning seat 11 is flush with the upper surface of the second supporting seat 3. The square-tube-shaped workpiece 100 is electrically conducted while being positioned on the first and

second supports

1 and 3, so as to facilitate welding.

The first supporting seat 1 further comprises a water cooling block 14 arranged above the conductive copper platform 12 and used for dissipating heat of the conductive copper platform 12 which generates heat during welding.

In this embodiment, the first positioning block 45 and the second positioning block 47 are respectively provided with an adjusting slot, so that the mounting position of the first positioning block on the second support seat 3 can be adjusted to fit the side surface of the square pipe-shaped workpiece 100.

In this embodiment, as shown in fig. 5 and 6, the first welding assembly 7 includes a welding cylinder 72 mounted on the mounting plate 6 through a mounting seat 71, a welding electrode 73 connected to the welding cylinder 72, an iron sheet pressing cylinder 74 located on one side of the welding electrode 73, and an iron sheet pressing block 75 connected to the iron sheet pressing cylinder 74, a groove 76 and a strong magnet fixed in the groove 76 are formed above the welding electrode 73, the iron sheet pressing cylinder 74 can drive the iron sheet pressing block 75 to rotate above the groove 76 and press the iron sheet 200 in the groove 76, and the welding cylinder 72 can drive the welding electrode 73 to move on the mounting plate 6 along the Y direction, so as to weld the iron sheet 200 to the square tube-shaped workpiece 100.

Further, in order to adapt to the different welding position of iron sheet 200 on square tubular workpiece 200, improve the application scope of the square tubular workpiece iron sheet welding mechanism of this embodiment, first welding subassembly 7 is including installing the sliding subassembly 77 on mounting panel 6, sliding subassembly 77 includes along Y to installing T type groove 771 and guide rail 772 on mounting panel 6 at the interval, the length of T type groove 771 and guide rail 772 all extends along the X to, mount pad 71 below is provided with guide rail 772 sliding fit's spout and the T type connecting rod with T type groove 771 grafting complex.

In order to facilitate the sliding welding of the cylinder 72, the sliding assembly 77 further includes an adjusting screw 773 located between the T-shaped groove 771 and the guide rail 772, a connecting plate is disposed below the mounting seat 71, a threaded hole for the adjusting screw 773 to pass through is formed in the connecting plate, and the adjusting screw 773 is mounted on the mounting plate 6 and is screwed with the adjusting screw 773.

In this embodiment, the first welding assembly 7 further includes a floating joint 78, a fixing plate and a second conductive copper plate 79, the welding cylinder 72 is connected to the fixing plate through the floating joint 78, the second conductive copper plate 79 is located on one side of the fixing plate far away from the floating joint 78, the welding cylinder 72 is further connected to the fixing plate through a plurality of guide shafts, and the welding electrode 73 is fixed to the second conductive copper plate 79. In this embodiment, after the square pipe-shaped workpiece 100 and the iron sheet 200 are respectively positioned, the welding cylinder 72 drives the iron sheet 200 to contact the square pipe-shaped workpiece 100, and the welding is achieved after the electric conduction.

In this embodiment, as shown in fig. 7, the welding cylinder of the second welding assembly 8 is fixed on the mounting plate 6, and except that the sliding function of the first welding assembly 7 is not provided, the structure thereof is the same as that of the first welding assembly 7, and detailed description thereof is omitted.

Of course, the welding device in this embodiment further includes a welding electrode connected to the first welding assembly 7 and the second welding assembly 8, and a power supply electrically connected to the first conductive copper plate 13 and the second conductive copper plate 79 through a conductive device, so as to form a conductive loop, and further weld the iron sheet 200 on the square tube-shaped workpiece 100, which is not described in detail again.

It should be understood that the above-described embodiments are merely illustrative of the preferred embodiments of the present invention and the technical principles thereof. It will be understood by those skilled in the art that various modifications, equivalents, changes, and the like can be made to the present invention. However, these modifications are within the scope of the present invention as long as they do not depart from the spirit of the present invention. In addition, certain terms used in the specification and claims of the present application are not limiting, but are used merely for convenience of description.

Claims

1. The utility model provides a square pipe type work piece iron sheet welding mechanism which characterized in that includes:

2. The square tube type workpiece iron sheet welding mechanism according to claim 1, wherein the first positioning assembly comprises a plurality of welding positioning blocks which are arranged at intervals along the length of the first supporting seat and serve as electrodes, a plurality of first pressing blocks which are arranged at intervals on the first supporting seat, and a first pressing cylinder which can drive the first pressing blocks to rotate and lift, the first supporting seat is provided with a first placing position which is positioned on one side, close to the other first supporting seat, of the welding positioning blocks and is used for placing a square tube type workpiece, and the first pressing cylinder can drive the first pressing blocks to selectively rotate to the first placing position and press the square tube type workpiece positioned at the first placing position;

3. The square tube type workpiece iron sheet welding mechanism according to claim 2, wherein the second positioning assembly further comprises a second pressing block mounted on the second support seat opposite to the second positioning cylinder and a second pressing cylinder capable of driving the second pressing block to rotate and lift, a second placing position for placing the square tube type workpiece is arranged on the second support seat and between the second pressing block and the second positioning cylinder, and the second pressing cylinder can drive the second pressing block to rotate to the second placing position and press the square tube type workpiece on the second placing position.

4. The mechanism of claim 3, wherein the second positioning assembly further comprises two sets of first positioning blocks mounted on the second support base adjacent to one of the second positioning cylinders, each set of first positioning blocks comprises two first positioning blocks located on two sides of the second positioning cylinder, and the first positioning blocks are located between the second pressing block and the second positioning cylinder.

5. The square tube type workpiece iron sheet welding mechanism as claimed in claim 3, wherein the second positioning assembly further comprises two sets of third positioning cylinders mounted on the second support base and respectively located between the second pressing block and the first positioning cylinder, a third conductive pressing block connected to an output shaft of the third positioning cylinder, and two sets of second positioning blocks mounted on the second support base adjacent to one of the third positioning cylinders, each set of the second positioning blocks comprises two second positioning blocks respectively located on both sides of the third positioning cylinder, and the second positioning blocks are located between the third positioning cylinder and the first positioning cylinder.

6. The mechanism of claim 2, wherein the first supporting seat comprises a first positioning seat for positioning the square pipe type workpiece and installing the first pressing cylinder, a conductive copper platform fixed above the first positioning seat, and a first conductive copper plate located at two ends of the first positioning seat and connected with the conductive copper platform, the welding positioning block contacts with one side of the conductive copper platform, and the upper surface of the first positioning seat is flush with the upper surface of the second supporting seat.

7. The square tube type workpiece iron sheet welding mechanism of claim 6, wherein the first welding assembly comprises a welding cylinder mounted on the mounting plate through a mounting seat, a welding electrode connected with the welding cylinder, an iron sheet pressing cylinder located on one side of the welding electrode and an iron sheet pressing block connected with the iron sheet pressing cylinder, a groove and a strong magnet fixed in the groove are formed above the welding electrode, the iron sheet pressing cylinder can drive the iron sheet pressing block to rotate to the upper side of the groove and press the iron sheet in the groove, and the welding cylinder can drive the welding electrode to move along the Y direction on the mounting plate.

8. The square tube type workpiece iron sheet welding mechanism according to claim 7, wherein the first welding assembly comprises a sliding assembly installed on the installation plate, the sliding assembly comprises a T-shaped groove and a guide rail installed on the installation plate at intervals along the Y direction, the lengths of the T-shaped groove and the guide rail extend along the X direction, and a sliding groove in sliding fit with the guide rail and a T-shaped connecting rod in splicing fit with the T-shaped groove are arranged below the installation seat.

9. The square tube type workpiece iron sheet welding mechanism according to claim 8, wherein the sliding assembly further comprises an adjusting screw rod positioned between the T-shaped groove and the guide rail, a connecting plate is arranged below the mounting seat, a threaded hole for the adjusting screw rod to pass through is formed in the connecting plate, and the adjusting screw rod is mounted on the mounting plate and is in threaded connection with the adjusting screw rod.

10. The square tube type workpiece iron sheet welding mechanism according to claim 8, wherein the first welding assembly further comprises a floating joint, a fixed plate and a second conductive copper plate, the welding cylinder is connected with the fixed plate through the floating joint, the second conductive copper plate is located on one side, away from the floating joint, of the fixed plate, the welding cylinder is further connected with the fixed plate through a plurality of guide shafts, and the welding electrode is fixed on the second conductive copper plate.