Square tube laser welding tool for assisting in pressing and laser welding equipment

Abstract

The invention relates to the related technical field of laser welding, in particular to a square tube laser welding tool and laser welding device.The square tube laser welding tool assisting in pressing assists in pressing and comprises a tool frame body; the tool frame body comprises a support, two first supporting plates and two second supporting plates, the two first supporting plates are fixed to the support and oppositely arranged, the two second supporting plates are fixedly connected with the two first supporting plates, and through openings allowing square pipes to penetrate through are formed in the two second supporting plates so that a square pipe welding advancing route penetrating through the tool frame body can be formed; in the welding work, the synchronous driving mechanism works to drive the multiple first pressing wheels to rotate synchronously, the rotating directions of the first pressing wheels located on the two sides of the square pipe welding advancing route are opposite, meanwhile, the synchronous driving mechanism further drives the two second pressing wheels to rotate through the transmission mechanism, and therefore under the synergistic effect of the first pressing wheels and the second pressing wheels, the square pipe welding efficiency is improved. And the square tube can stably move along the welding advancing route.

Description

Technical Field

[0001] The invention relates to the technical field related to laser welding, in particular to auxiliary pressing square tube laser welding tooling and laser welding equipment. Background Art

[0002] Square tube is a tubular material with a square cross-section, usually made of strip steel after processing and rolling. After the strip steel is rolled, the square tube is initially formed, but there is still a gap on one side. For this, the gap needs to be welded, and then polished and cut before it can be shipped.

[0003] When performing welding processing work on the gap, corresponding welding tools are required to fix the square tube and assist in conveying. However, the existing welding tools, when in use, generally use multiple rollers to be set around the square tube to achieve clamping and positioning of the square tube, ensuring that the square tube remains relatively stable during the welding process to improve the welding effect. At the same time, in order to achieve continuous welding of the square tube, two methods are generally used to achieve continuous movement of the square tube. First, a traction device or a pushing device is used to achieve the movement of the square tube; second, multiple driving sources are set on multiple rollers, and the rollers can achieve continuous movement of the square tube by rotating themselves while achieving roller positioning and pressing.

[0004] A traction device or a pushing device is used to move the square tube. Since the force is located at one end of the welding fixture, if the feeding or discharging is tilted, it is easy to make the force uniformity between the square tube and the welding fixture uneven, resulting in uneven welding position of the square tube due to uneven force; Using multiple driving sources to drive multiple roller devices solves the drawbacks of using traction devices or pushing devices to a certain extent. However, when multiple driving sources drive multiple rollers to rotate, it is easy for the pressure between the rollers and the square tubes to be different, resulting in different loads on the driving sources. At this time, the driving speeds of the multiple driving sources will have certain differences. When the driving speeds acting at different positions on the square tube are different, the square tube will not be able to maintain a constant speed to a certain extent. At the same time, the forces acting on each position of the square tube will also change, resulting in defects in the square tube welding. Summary of the invention

[0005] The purpose of the present invention is to provide a square tube laser welding tool and laser welding equipment with auxiliary pressing to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A square tube laser welding tool for auxiliary clamping, comprising a tool frame, the tool frame comprising a support and two first support plates fixed on the support and arranged opposite to each other, and two second support plates fixedly connected to the two first support plates, wherein both the second support plates are provided with a through hole for the square tube to pass through, so as to form a square tube welding route running through the tool frame; The auxiliary pressing square tube laser welding tool also includes: Two first pressing wheels are respectively arranged on both sides of the square tube welding route, and the first pressing wheels on both sides of the route can be driven by a spacing adjustment mechanism installed in the tooling frame to perform separation or approaching actions, and a synchronous driving mechanism is also arranged in the tooling frame, and the synchronous driving mechanism can drive the plurality of first pressing wheels to perform synchronous rotation, and the first pressing wheels on both sides of the square tube welding route rotate in opposite directions; Two second pressure wheels are provided on the square tube welding route. The two second pressure wheels can be driven by a lifting drive mechanism installed in the tooling frame to rise and fall synchronously. The two second pressure wheels are connected to the synchronous drive mechanism through a transmission mechanism so that the first pressure wheel and the second pressure wheel can rotate synchronously, thereby causing the square tube clamped between the first pressure wheel and the second pressure wheel to move along the square tube welding route.

[0007] As a further solution of the present invention: four installation positions are respectively provided on the two second support plates, and each installation position is provided with a bevel wheel, which abuts against the welding surface of the square tube, and an auxiliary wheel is respectively provided on the two first support plates, which abuts against both sides of the square tube.

[0008] As a further solution of the present invention: the two first pressure wheels located on one side of the square tube welding route are connected by a first belt, the two second pressure wheels are connected by a seventh belt, the two first pressure wheels located on the same side of the tooling frame are respectively connected to the synchronous drive mechanism, and one of the second pressure wheels is connected to the transmission mechanism.

[0009] As a further solution of the present invention: the spacing adjustment mechanism includes a bidirectional screw rod rotatably mounted between the two first support plates and a first guide rod fixed between the two first support plates, the bidirectional screw rod is symmetrically provided with two threaded sleeves threadedly connected to the bidirectional screw rod, and the first guide rod is symmetrically slidably provided with two guide sleeves; Among them, an assembly plate is fixedly connected between the threaded sleeve and the guide sleeve located on the same side, and the two first pressure wheels located on the same side of the square tube welding route are rotatably installed on the assembly plate, and one of the first pressure wheels is connected to the synchronous drive mechanism.

[0010] As a further solution of the present invention: the synchronous drive mechanism includes a power component installed in the tooling frame and two groups of follower components connected to the power component, the two groups of follower components are respectively connected to the first pressure wheel located on both sides of the square tube welding travel path, and the power component is connected to the transmission mechanism.

[0011] As a further solution of the present invention: the power assembly includes a driving motor installed in the tooling frame and a driving shaft rotatably installed in the tooling frame and connected to the output shaft of the driving motor through a third belt, and two transmission areas are symmetrically arranged on the driving shaft, and two horizontal columns are formed in the transmission area and located at the eccentric position of the driving shaft.

[0012] As a further solution of the present invention: the follower assembly includes a kit and a transmission shaft rotatably mounted on the assembly plate, the transmission shaft is connected to the kit through a bevel gear set, and is also connected to the rotating shaft of the first pressure wheel through a second belt, the kit is slidably connected to the two cross columns and is coaxial with the drive shaft.

[0013] As a further solution of the present invention: the transmission mechanism includes a rotating shaft rotatably installed in the tooling frame body and connected to the driving shaft member through a fourth belt, a first gear fixed to the rotating shaft, and a second gear rotatably installed in the tooling frame body and meshing with the first gear, and the rotating shaft of the second gear is connected to the second pressure wheel through a transmission arm group; The transmission arm group includes a first connecting rod and a second connecting rod whose head ends are rotatably connected by a connecting shaft. The tail ends of the first connecting rod and the second connecting rod are respectively rotatably connected to the second gear and the rotating shaft of the second pressure wheel, and the connecting shaft is also respectively connected to the rotating shaft of the second gear and the second pressure wheel through a fifth belt and a sixth belt.

[0014] As a further solution of the present invention: the lifting drive mechanism includes a one-way screw rotatably installed in the tooling frame, a second guide rod fixed in the working frame, and two connecting blocks respectively arranged on the one-way screw and the second guide rod, the two connecting blocks are fixedly connected to a cross beam, the two second pressure wheels are rotatably installed on the cross beam, and one of the connecting blocks is threadedly connected to the one-way screw, and the other connecting block is slidably connected to the second guide rod.

[0015] The laser welding equipment comprises the auxiliary pressing square tube laser welding tool and also comprises a laser welding head installed on the tool frame.

[0016] Compared with the prior art, the present invention has the following beneficial effects: During operation, the first pressing wheel and the second pressing wheel arranged on both sides of the tooling frame are used to press and limit the square tube, ensuring that the square tube can accurately move along the specified line and ensure the welding accuracy; Secondly, during the welding operation, the synchronous drive mechanism works to drive multiple first pressure wheels to perform synchronous rotation, and the first pressure wheels on both sides of the square tube welding route rotate in opposite directions. At the same time, the synchronous drive mechanism also drives the two second pressure wheels to rotate through the transmission mechanism. Therefore, under the coordinated action of the first pressure wheel and the second pressure wheel, the square tube can move stably along the welding route. Therefore, by setting a mechanical structure between the first pressing wheel and the second pressing wheel, a synchronous linkage effect is achieved without using multiple separately set driving sources, thereby ensuring the consistency of the rotation forms of the first pressing wheel and the second pressing wheel, and avoiding the problem of jamming in the transmission of the square tube during welding; In addition, the first pressure wheels located on both sides of the square tube welding route can be driven by the spacing adjustment mechanism to move synchronously and perform the action of moving away from or approaching each other. Therefore, it can ensure that the square tube is stably clamped between the first pressure wheels on both sides of the route, so that the square tube maintains a high degree of consistency with the route. At the same time, the pressure of the first pressure wheels on both sides of the route on the side of the square tube can be ensured to be consistent, avoiding the square tube from having difficulty in moving at a constant speed due to the difference in pressure on both sides of the square tube, thereby affecting the welding accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A structural schematic diagram of an embodiment of a square tube laser welding tooling with auxiliary clamping.

[0018] Figure 2 A schematic structural diagram of another angle of an embodiment of a square tube laser welding tooling for auxiliary clamping.

[0019] Figure 3 A structural schematic diagram of another angle of an embodiment of a square tube laser welding tool for auxiliary clamping.

[0020] Figure 4 A side view of an embodiment of a square tube laser welding tool for auxiliary clamping.

[0021] Figure 5 A schematic diagram of the internal structure of a tool frame in one embodiment of a square tube laser welding tool for auxiliary clamping.

[0022] Figure 6 for Figure 5 Schematic diagram of the structure from another angle.

[0023] Figure 7 for Figure 5 Schematic diagram of the structure from another angle.

[0024] Figure 8An exploded view of the structure of the synchronous drive mechanism in one embodiment of a square tube laser welding tool for auxiliary clamping.

[0025] Fig. 9 for Figure 8 Schematic diagram of the structure from another angle.

[0026] Fig.10 An exploded view of the structure of the transmission mechanism in one embodiment of a square tube laser welding tool for auxiliary clamping.

[0027] In the figure: 1, support; 2, first support plate; 3, second support plate; 4, first pressure wheel; 5, second pressure wheel; 6, inclined wheel; 7, auxiliary wheel; 8, laser welding head; 9, two-way screw; 10, first guide rod; 11, threaded sleeve; 12, guide sleeve; 13, assembly plate; 14, first hand wheel; 15, first belt; 16, second belt; 17, transmission shaft; 18, bevel gear set; 19, kit; 20, drive shaft; 21, cross column; 22, drive motor; 23, third belt; 24, fourth belt; 25, rotating shaft; 26, first gear; 27, second gear; 28, connecting shaft; 29, fifth belt; 30, sixth belt; 31, first connecting rod; 32, second connecting rod; 33, one-way screw; 34, second guide rod; 35, second hand wheel; 36, connecting block; 37, cross beam; 38, seventh belt. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0030] See also Figure 1-Figure 10In an embodiment of the present invention, the auxiliary clamping square tube laser welding tool comprises a tool frame, wherein the tool frame comprises a support 1 and two first support plates 2 fixed on the support 1 and arranged opposite to each other, and two second support plates 3 fixedly connected to the two first support plates 2, wherein both the two second support plates 3 are provided with a through hole for the square tube to pass through, so as to form a square tube welding route running through the tool frame; The auxiliary pressing square tube laser welding tool also includes: Two first pressing wheels 4 are provided on each side of the square tube welding route, and the first pressing wheels 4 on both sides of the route can be driven by a spacing adjustment mechanism installed in the tooling frame to perform separation or approaching actions. A synchronous driving mechanism is also provided in the tooling frame, and the synchronous driving mechanism can drive multiple first pressing wheels 4 to perform synchronous rotation, and the first pressing wheels 4 on both sides of the square tube welding route rotate in opposite directions; Two second pressing wheels 5 are arranged on the square tube welding route. The two second pressing wheels 5 can be driven by the lifting drive mechanism installed in the tooling frame to rise and fall synchronously. The two second pressing wheels 5 are connected to the synchronous drive mechanism through a transmission mechanism so that the first pressing wheel 4 and the second pressing wheel 5 can rotate synchronously, so as to move the square tube clamped between the first pressing wheel 4 and the second pressing wheel 5 along the square tube welding route.

[0031] Please refer again Figure 3 and Figure 4 The two second support plates 3 are respectively provided with four mounting positions, and each of the mounting positions is provided with a bevel wheel 6, and the bevel wheel 6 abuts against the welding surface of the square tube. The two first support plates 2 are also respectively provided with an auxiliary wheel 7, and the auxiliary wheel 7 abuts against both sides of the square tube.

[0032] During welding, the first pressing wheel 4 and the second pressing wheel 5 press and limit the three sides of the square tube (except the welding side), so as to ensure that the square tube is aligned with the laser and the welding accuracy is ensured. Secondly, the auxiliary wheels 7 are arranged on both sides of the square tube welding route. Specifically, the auxiliary wheels 7 are located on both sides of the light spot, so as to further improve the stability of the square tube. Secondly, during the welding operation, the synchronous drive mechanism works to drive multiple first pressure wheels 4 to rotate synchronously, and the first pressure wheels 4 located on both sides of the square tube welding route rotate in opposite directions. At the same time, the synchronous drive mechanism also drives the two second pressure wheels 5 to rotate through the transmission mechanism. Therefore, under the coordinated action of the first pressure wheel 4 and the second pressure wheel 5, the square tube can move stably along the welding route.

[0033] Please refer again Figure 5 , Figure 6 as well as Figure 7 The two first pressure wheels 4 located on one side of the square tube welding route are connected by a first belt 15, and the two second pressure wheels 5 are connected by a seventh belt 38. The two first pressure wheels 4 located on the same side of the tooling frame are respectively connected to the synchronous drive mechanism, and one of the second pressure wheels 5 is connected to the transmission mechanism.

[0034] Please refer again Figure 8 and Fig. 9 The spacing adjustment mechanism includes a bidirectional screw rod 9 rotatably mounted between the two first support plates 2 and a first guide rod 10 fixed between the two first support plates 2, the bidirectional screw rod 9 is symmetrically provided with two threaded sleeves 11 threadedly connected to the bidirectional screw rod 9, and the first guide rod 10 is symmetrically slidably provided with two guide sleeves 12; Among them, an assembly plate 13 is fixedly connected between the threaded sleeve 11 and the guide sleeve 12 located on the same side, and the two first pressure wheels 4 located on the same side of the square tube welding route are rotatably installed on the assembly plate 13, and one of the first pressure wheels 4 is connected to the synchronous drive mechanism.

[0035] It should be supplemented that a first hand wheel 14 is fixedly provided at one end of the bidirectional screw rod 9. During operation, the staff can rotate the bidirectional screw rod 9 through the first hand wheel 14. Then, under the guiding action of the guide sleeve 12 and the first guide rod 10, the two threaded sleeves 11 can be threadedly matched with the bidirectional screw rod 9 to move closer to or away from each other. Correspondingly, the two assembly plates 13 move closer to or away from each other, so that the first pressure wheels 4 on both sides of the square tube welding route are closer to or away from each other, so as to press the square tube or release the pressure on the square tube. The spacing adjustment of the first pressure wheels 4 on both sides of the square tube welding route is achieved through the threaded matching between the bidirectional screw rod 9 and the threaded sleeves 11, which has the advantages of high driving accuracy, good stability and self-locking.

[0036] The synchronous drive mechanism includes a power component installed in the tooling frame and two groups of follower components connected to the power component. The two groups of follower components are respectively connected to the first pressure wheel 4 located on both sides of the square tube welding travel route, and the power component is connected to the transmission mechanism.

[0037] The power assembly includes a driving motor 22 installed in the tooling frame and a driving shaft 20 rotatably installed in the tooling frame and connected to the output shaft of the driving motor 22 through a third belt 23. The driving shaft 20 is symmetrically provided with two transmission areas, and two transverse columns 21 located at the eccentric position of the driving shaft 20 are formed in the transmission area. The follower assembly includes a set 19 rotatably installed on the assembly plate 13 and a transmission shaft 17. The transmission shaft 17 is connected to the set 19 through a bevel gear set 18 and is also connected to the rotating shaft of the first pressure wheel 4 through a second belt 16. The set 19 is slidably connected to the two transverse columns 21 and is coaxial with the driving shaft 20.

[0038] When the bidirectional screw rod 9 is rotated to adjust the spacing between the first pressing wheels 4 on both sides of the welding route of the square tube, the assembly plate 13 drives the kit 19 to slide along the axial direction of the driving shaft 20 on the two cross columns 21; Specifically, the bevel gear set 18 includes a first bevel gear fixedly mounted on the set 19 and a second bevel gear fixedly mounted on one end of the transmission shaft 17 facing the set 19, and the second bevel gear meshes with the first bevel gear; During the welding process, the output shaft of the driving motor 22 drives the driving shaft 20 to rotate through the third belt 23, so that the two horizontal columns 21 can drive the set 19 to rotate, and the set 19 drives the transmission shaft 17 to rotate through the bevel gear set 18, so that the transmission shaft 17 drives the first pressure wheel 4 to rotate through the second belt 16; It should be emphasized that the bevel gear set 18 connected to the two sets 19 is set in a mirror image. Therefore, the drive shaft 20 rotates, driving the two sets 19 to rotate in the same direction. After the transmission of the bevel gear set 18, the two transmission shafts 17 rotate in opposite directions, that is, the first pressure wheels 4 on both sides of the square tube welding route rotate in opposite directions, thereby realizing an effective conveying function for the square tube.

[0039] Please refer again Figure 7 and Fig.10 The transmission mechanism includes a rotating shaft 25 rotatably mounted in the tooling frame and connected to the driving shaft 20 via a fourth belt 24, a first gear 26 fixed to the rotating shaft 25, and a second gear 27 rotatably mounted in the tooling frame and meshing with the first gear 26, and the rotating shaft of the second gear 27 is connected to the second pressing wheel 5 via a transmission arm group; The transmission arm group includes a first connecting rod 31 and a second connecting rod 32 whose head ends are rotatably connected by a connecting shaft 28, and the tail ends of the first connecting rod 31 and the second connecting rod 32 are respectively rotatably connected to the second gear 27 and the rotating shaft of the second pressure wheel 5, and the connecting shaft 28 is also respectively connected to the rotating shaft of the second gear 27 and the second pressure wheel 5 through a fifth belt 29 and a sixth belt 30.

[0040] The lifting drive mechanism includes a one-way screw 33 rotatably installed in the tooling frame, a second guide rod 34 fixed in the working frame, and two connecting blocks 36 respectively arranged on the one-way screw 33 and the second guide rod 34, the two connecting blocks 36 are fixedly connected to a cross beam 37, the two second pressure wheels 5 are rotatably installed on the cross beam 37, and one of the connecting blocks 36 is threadedly connected to the one-way screw 33, and the other connecting block 36 is slidably connected to the second guide rod 34.

[0041] A second hand wheel 35 is fixedly provided at one end of the one-way screw rod 33. When working, the staff can rotate the one-way screw rod 33 through the second hand wheel 35. Then, under the guiding action of the second guide rod 34, the connecting block 36 on the one-way screw rod 33 is threadedly matched with the one-way screw rod 33, and then the two second pressing wheels 5 are driven to rise and fall synchronously through the cross beam 37, so as to adjust the supporting height of the square tube, so as to achieve the best spacing between the weld on the square tube and the welding equipment. Secondly, when working, the height of the second pressing wheel 5 is adaptively adjusted, and the pressing position of the first pressing wheel 4 on the square tube can also be changed, so as to avoid the first pressing wheel 4 being too close to the welding surface of the square tube, which causes the weld of the square tube to be deflected under the action of the pressing force. During operation, the driving motor 22 drives the driving shaft 20 to rotate through the third belt 23, and the driving shaft 20 drives the rotating shaft 25 to rotate through the fourth belt 24. Furthermore, since the first gear 26 is meshed with the second gear 27, the rotating shaft of the second gear 27 drives the second pressing wheel 5 to rotate through the fifth belt 29 connecting shaft 28 and the sixth belt 30. The arrangement of the first gear 26 and the second gear 27 can play a role in changing direction transmission, ensuring that the direction of the second pressing wheel 5 is adapted to the direction of travel of the square tube. The angle between the first connecting rod 31 and the second connecting rod 32 will change during the lifting and lowering of the second pressure wheel 5. Specifically, when the second pressure wheel 5 rises, the angle between the first connecting rod 31 and the second connecting rod 32 increases, and vice versa, so as to ensure that the transmission connection state between the second gear 27 and the second pressure wheel 5 can be maintained normally when the second pressure wheel 5 is at different heights.

[0042] As another embodiment of the present invention, a laser welding device is also proposed, including the auxiliary pressing square tube laser welding tool, and also including a laser welding head 8 installed on the tool frame.

[0043] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0044] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A square tube laser welding tool for auxiliary clamping, comprising a tool frame, the tool frame comprising a support (1), two first support plates (2) fixed on the support (1) and arranged opposite to each other, and two second support plates (3) fixedly connected to the two first support plates (2), wherein: The two second support plates (3) are each provided with a through hole for the square tube to pass through, so as to form a square tube welding route that runs through the tooling frame; It is characterized by further comprising: Two first pressing wheels (4) are respectively arranged on both sides of the square tube welding route, and the first pressing wheels (4) on both sides of the route can be driven by a spacing adjustment mechanism installed in the tooling frame body to perform a separation or approaching action, and the tooling frame body is also provided with a synchronous driving mechanism, the synchronous driving mechanism can drive a plurality of the first pressing wheels (4) to perform synchronous rotation, and the first pressing wheels (4) located on both sides of the square tube welding route have opposite directions of rotation; Two second pressing wheels (5) are arranged on the square tube welding route. The two second pressing wheels (5) can be driven by a lifting drive mechanism installed in the tooling frame body to rise and fall synchronously. The two second pressing wheels (5) are connected to the synchronous drive mechanism through a transmission mechanism so that the first pressing wheel (4) and the second pressing wheel (5) can rotate synchronously, thereby causing the square tube clamped between the first pressing wheel (4) and the second pressing wheel (5) to move along the square tube welding route.

2. The square tube laser welding tool with auxiliary pressing according to claim 1 is characterized in that: The two second support plates (3) are respectively provided with four mounting positions, and each mounting position is provided with an inclined wheel (6), the inclined wheel (6) abuts against the welding surface of the square tube, and the two first support plates (2) are also respectively provided with an auxiliary wheel (7), the auxiliary wheel (7) abuts against two sides of the square tube.

3. The square tube laser welding tool with auxiliary clamping according to claim 2 is characterized in that: The two first pressing wheels (4) located on one side of the square tube welding travel route are connected via a first belt (15), the two second pressing wheels (5) are connected via a seventh belt (38), the two first pressing wheels (4) located on the same side of the tooling frame are respectively connected to the synchronous drive mechanism, and one of the second pressing wheels (5) is connected to the transmission mechanism.

4. The square tube laser welding tool with auxiliary pressing according to claim 3 is characterized in that: The spacing adjustment mechanism comprises a bidirectional screw rod (9) rotatably mounted between the two first support plates (2) and a first guide rod (10) fixed between the two first support plates (2), the bidirectional screw rod (9) being symmetrically provided with two threaded sleeves (11) threadedly connected to the bidirectional screw rod (9), and the first guide rod (10) being symmetrically provided with two guide sleeves (12) slidably mounted on the first guide rod (10); An assembly plate (13) is fixedly connected between the threaded sleeve (11) and the guide sleeve (12) located on the same side, and two first pressing wheels (4) located on the same side of the square tube welding travel route are rotatably mounted on the assembly plate (13), and one of the first pressing wheels (4) is connected to the synchronous drive mechanism.

5. The square tube laser welding tool with auxiliary pressing according to claim 4 is characterized in that: The synchronous drive mechanism comprises a power assembly installed in the tooling frame and two groups of follower assemblies connected to the power assembly, the two groups of follower assemblies are respectively connected to the first pressure wheels (4) located on both sides of the square tube welding travel path, and the power assembly is connected to the transmission mechanism.

6. The square tube laser welding tool with auxiliary pressing according to claim 5 is characterized in that: The power assembly comprises a drive motor (22) mounted in the tooling frame body, and a drive shaft (20) rotatably mounted in the tooling frame body and connected to the output shaft of the drive motor (22) via a third belt (23), wherein the drive shaft (20) is symmetrically provided with two transmission areas, and wherein two transverse columns (21) are formed in the transmission areas and are located at eccentric positions of the drive shaft (20).

7. The square tube laser welding tool with auxiliary pressing according to claim 6 is characterized in that: The follower assembly comprises a sleeve (19) and a transmission shaft (17) rotatably mounted on the assembly plate (13); the transmission shaft (17) is connected to the sleeve (19) via a bevel gear set (18) and is also connected to the rotation axis of the first pressure wheel (4) via a second belt (16); the sleeve (19) is slidably connected to the two cross columns (21) and is coaxial with the drive shaft (20).

8. The square tube laser welding tool with auxiliary pressing according to claim 6 is characterized in that: The transmission mechanism comprises a rotating shaft (25) rotatably mounted in the tooling frame and connected to the driving shaft (20) via a fourth belt (24), a first gear (26) fixed to the rotating shaft (25), and a second gear (27) rotatably mounted in the tooling frame and meshing with the first gear (26), the rotating shaft of the second gear (27) being connected to the second pressure wheel (5) via a transmission arm assembly; The transmission arm assembly comprises a first connecting rod (31) and a second connecting rod (32) whose head ends are rotatably connected via a connecting shaft (28); the tail ends of the first connecting rod (31) and the second connecting rod (32) are rotatably connected to the second gear (27) and the rotating shaft of the second pressure wheel (5), respectively; and the connecting shaft (28) is also connected to the rotating shaft of the second gear (27) and the second pressure wheel (5) via a fifth belt (29) and a sixth belt (30), respectively.

9. The square tube laser welding tool with auxiliary pressing according to claim 1 is characterized in that: The lifting drive mechanism comprises a one-way screw (33) rotatably mounted in the tooling frame, a second guide rod (34) fixed in the working frame, and two connecting blocks (36) respectively arranged on the one-way screw (33) and the second guide rod (34), the two connecting blocks (36) being fixedly connected to a crossbeam (37), the two second pressure wheels (5) being rotatably mounted on the crossbeam (37), one of the connecting blocks (36) being threadedly connected to the one-way screw (33), and the other connecting block (36) being slidably connected to the second guide rod (34).

10. Laser welding equipment, comprising the auxiliary clamping square tube laser welding tool as claimed in any one of claims 1 to 9, characterized in that: It also includes a laser welding head (8) mounted on the tooling frame.

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