A portable welding device for engineering machinery vehicles and its method of use

Abstract

The present invention relates to the technical field of welding equipment, and discloses a portable welding equipment for engineering machinery vehicles and a method of using the same, including a carriage, a sliding frame fixedly installed on the top inner wall of the carriage, a driving motor fixedly installed on the back inner wall of the carriage, a threaded rod rotatably installed in the sliding frame, the end of the threaded rod extends to the outside of the sliding frame and is fixedly connected to the output shaft of the driving motor, and also includes: a movable mechanism, the movable mechanism includes a T-shaped internal thread block threadedly sleeved on the threaded rod, and the T-shaped internal thread block is slidably connected to the sliding frame. The T-shaped ladder rod of the present invention will slide into the rectangular slide groove when leaving the limiting slide groove and just contacting the limiting rail, so that the T-shaped ladder rod can enter the limiting rail to complete the track connection work. At this time, the limiting rail will drop under the gravity of the welding machine until it contacts the ground, thereby reducing the workload of manual handling of the welding machine and improving convenience.

Description

Technical Field

[0001] The present invention relates to the technical field of welding equipment, and in particular to a portable welding equipment for an engineering machinery vehicle and a use method thereof. Background Art

[0002] Construction machinery refers to mechanical equipment used for construction and land development. These mechanical equipment are usually composed of heavy vehicles, excavators, loaders, bulldozers and rollers. Heavy vehicles are an important part of construction machinery. They are usually used to transport large amounts of earth and stone materials from one place to another. These vehicle types include trucks, dump trucks, tractors, trailers, etc. On construction sites, these vehicles are usually used to transport construction materials, soil, stones, etc. Therefore, after long-term use, their own parts will wear out or even break, so that welding equipment is needed to weld them efficiently so that they can continue to carry out high-load work.

[0003] Most of the portable welding machines on engineering vehicles need to be carried manually. When faced with a large welding object, the welding machine needs to be carried down by manpower. Since most welding machines are heavy, this process not only consumes manpower but also delays time, thereby reducing work efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a portable welding device for engineering machinery vehicles and a method of using the same, so as to solve the problem that most portable welding machines on engineering vehicles need to be carried manually. When faced with a large welding body, the welding machine needs to be carried down by manpower. Since most welding machines are heavy, this process not only consumes manpower but also wastes time, thereby reducing work efficiency.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The present invention is a portable welding device for engineering machinery vehicles, comprising a carriage, a sliding frame fixedly mounted on the top inner wall of the carriage, a driving motor fixedly mounted on the back inner wall of the carriage, a threaded rod rotatably mounted in the sliding frame, the end of the threaded rod extending outside the sliding frame and fixedly connected to the output shaft of the driving motor, and further comprising:

[0007] Moving mechanism, the moving mechanism includes a T-shaped internal thread block threadedly sleeved on a threaded rod, the T-shaped internal thread block is slidably connected to a sliding frame, a multi-section telescopic cylinder is fixedly installed at the bottom of the T-shaped internal thread block, a welding machine is hingedly installed at the bottom end of the multi-section telescopic cylinder, two rotating rods are rotatably installed on the welding machine, limiting sliding grooves are respectively formed on the left inner wall and the right inner wall of the carriage, two rectangular sliding grooves are respectively formed in the two rotating rods, movable springs are respectively fixedly installed on the inner walls of the plurality of rectangular sliding grooves close to each other, T-shaped ladder rods are respectively fixedly installed at the ends of the plurality of movable springs away from each other, and the ends of the plurality of T-shaped ladder rods away from each other respectively extend into the two limiting sliding grooves and are respectively slidably connected to the two limiting sliding grooves.

[0008] Further, two limiting rails are arranged in the carriage, a plurality of fixing plates are respectively fixedly installed on the two limiting rails, two C-shaped sliding rods are fixedly installed on the front surface of the carriage, the two C-shaped sliding rods respectively penetrate through the two limiting rails and are respectively slidably connected to the two limiting rails, and strip-shaped pads are fixedly installed at the bottoms of the two limiting rails.

[0009] Further, a limiting mechanism is arranged on the welding machine, the limiting mechanism includes limiting round rods respectively fixedly installed on the left side and the right side of the welding machine, two limiting strips are arranged in the carriage, horn-shaped limiting rails are respectively fixedly installed on the sides of the two limiting strips close to each other, the ends of the two limiting round rods away from each other respectively extend into the two horn-shaped limiting rails, and the two limiting round rods respectively match the two horn-shaped limiting rails.

[0010] Further, a limiting frame is fixedly installed at the bottom of the sliding frame, a strip-shaped horizontal plate is slidably installed in the limiting frame, two limiting springs are fixedly installed on the top of the strip-shaped horizontal plate, the top ends of the two limiting springs are both fixedly connected to the limiting frame, and the bottom ends of the two limiting strips are both fixedly connected to the strip-shaped horizontal plate.

[0011] Further, an L-shaped plate is fixedly installed at the bottom of the strip-shaped horizontal plate, a connecting horizontal plate is fixedly installed on the back surface of the L-shaped plate, and the connecting horizontal plate is fixedly connected to the two limiting rails.

[0012] Further, a dust removal mechanism is arranged on the front surface of the sliding frame, the dust removal mechanism includes an air box fixedly installed on the front surface of the sliding frame, the front end of the threaded rod extends into the air box and is rotatably connected to the air box, a plurality of air inlet holes are formed on the front surface of the air box, a plurality of fan blades are fixedly installed on the outer wall of the threaded rod, an L-shaped air outlet pipe is fixedly installed at the bottom of the air box, a blowing cover is fixedly installed at the bottom of the sliding frame, and the end of the L-shaped air outlet pipe communicates with the blowing cover.

[0013] Furthermore, an adaptable spring is fixedly mounted on the front inner wall of the sliding frame, a hollow adaptable plate is slidably mounted in the sliding frame, the threaded rod passes through the hollow adaptable plate, and the end of the adaptable spring is fixedly connected to the hollow adaptable plate.

[0014] Furthermore, the method for a portable welding device for an engineering vehicle comprises the following steps:

[0015] S1: Preliminary change of track;

[0016] S2: Track landing improves stability;

[0017] S3: Reduce the inhalation of harmful gases.

[0018] The present invention has the following beneficial effects:

[0019] (1) The present invention relates to a portable welding device for engineering machinery vehicles. When in use, a driving motor is started, the driving motor drives a threaded rod to rotate, the threaded rod drives a T-shaped internal thread block to move in a direction away from the driving motor, the T-shaped internal thread block drives a multi-section telescopic cylinder to move, the multi-section telescopic cylinder drives a welding machine to move, the welding machine drives a rotating rod to move, the rotating rod drives a T-shaped ladder rod to move, the T-shaped ladder rod drives the welding machine to move smoothly under the limiting action of a limiting slide groove, the welding machine drives a limiting round rod to move, the trumpet-shaped limiting rail descends under the action of the continuous movement of the limiting round rod, and when the limiting round rod moves to the trumpet of the trumpet-shaped limiting rail When the welding machine is in the right position, the trumpet-shaped limit rail will drive the limit bar to drop under the gravity of the welding machine, and the limit bar will drive the bar-shaped horizontal plate to drop. At this time, the limit spring will be stretched and deformed, and the bar-shaped horizontal plate will drive the L-shaped plate to drop. The L-shaped plate will drive the connecting horizontal plate to drop. The connecting horizontal plate drives the limit rail to drop to a position parallel to the T-shaped ladder rod. When the T-shaped ladder rod leaves the limit slide groove and just touches the limit rail, it will slide into the rectangular slide groove, so that the T-shaped ladder rod can enter the limit rail to complete the track connection. At this time, the limit rail will drop under the gravity of the welding machine until it touches the ground, thereby reducing the workload of manual handling of the welding machine and improving convenience.

[0020] (2) The present invention provides a portable welding device for engineering machinery vehicles. After the T-shaped ladder bar enters the limit rail, as the welding machine continues to move, the welding machine drives the limit round bar to slide out of the trumpet-shaped limit rail. At this time, the trumpet-shaped limit rail will not limit the limit round bar. At this time, the welding machine will not get stuck when going up and down the limit rail. When the T-shaped ladder bar contacts the limit rail, the limit spring will always be in a compressed state. After the welding machine is used, the drive motor is reversed again. At this time, the welding machine returns to the original path, and the limit round bar on the welding machine will directly enter the trumpet-shaped limit rail. After the T-shaped ladder bar leaves the limit rail, when the limit round bar goes downhill in the trumpet-shaped limit rail, the bar-shaped cross plate will rise under the elastic force of the limit spring. At this time, the corresponding limit rail and limit bar will rise, and the limit rail will leave the ground, preventing the limit rail from being damaged due to collision when the loaded vehicle moves;

[0021] (3) The present invention provides a portable welding device for engineering machinery vehicles. When the T-shaped internal thread block drives the welding machine to move outside the vehicle, the T-shaped internal thread block will contact the hollow adaptable plate, and the hollow adaptable plate will cause the adaptable spring to undergo compression deformation. When the T-shaped internal thread block leaves the thread of the threaded rod, the T-shaped internal thread block will be in a semi-detached state from the thread under the elastic force of the adaptable spring, and will not affect the normal rotation of the threaded rod. When the welding machine is used outside the vehicle, the threaded rod will drive a plurality of fan blades to rotate, and the fan blades will generate suction force and inhale the outside air through the air inlet hole, and then blow it toward the running welding machine through the L-shaped air outlet pipe and the blow hood. Blowing can promote the flow of air, promptly disperse these harmful gases and smoke, reduce the concentration of harmful substances in the air around the operator, and reduce the damage to the operator caused by harmful gases.

[0022] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a side cross-sectional structural schematic diagram of the present invention;

[0026] Figure 3 For the present invention Figure 2 A is a schematic diagram of the enlarged structure of the middle part;

[0027] Figure 4 Partial sectional structure schematic diagram of the welding machine of the present invention;

[0028] Figure 5 Internal partial sectional structure schematic diagram of the present invention;

[0029] Figure 6 For the present invention Figure 1 Enlarged structure schematic diagram of B in the present invention;

[0030] Figure 7 For the present invention Figure 2 Enlarged structure schematic diagram of C in the present invention;

[0031] Figure 8 Method step schematic diagram of the present invention.

[0032] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0033] In the figure: 1, carriage; 2, sliding frame; 3, drive motor; 4, threaded rod; 5, moving mechanism; 501, T-shaped internal thread block; 502, multi-section telescopic cylinder; 503, welding machine; 504, rotating rod; 505, limiting chute; 506, rectangular chute; 507, moving spring; 508, T-shaped ladder rod; 509, limiting rail; 510, fixing plate; 511, U-shaped sliding rod; 512, strip-shaped cushion block; 6, limiting mechanism; 601, limiting round rod; 602, limiting strip; 603, trumpet-shaped limiting rail; 604, limiting frame; 605, strip-shaped cross plate; 606, limiting spring; 607, L-shaped plate; 608, connecting cross plate; 7, dust removal mechanism; 701, air box; 702, air inlet hole; 703, fan blade; 704, L-shaped air outlet pipe; 705, blowing hood; 706, adapting spring; 707, hollow adapting plate. Specific embodiments

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] Please refer to Figure 1 - Figure 8 As shown, the present invention is a portable welding device for construction machinery vehicles, including a carriage 1. A sliding frame 2 is fixedly installed on the top inner wall of the carriage 1. A drive motor 3 is fixedly installed on the back inner wall of the carriage 1. A threaded rod 4 is rotatably installed in the sliding frame 2. The end of the threaded rod 4 extends outside the sliding frame 2 and is fixedly connected to the output shaft of the drive motor 3. It further includes:

[0036] The movable mechanism 5 includes a T-shaped internal thread block 501 threadedly sleeved on the threaded rod 4. The T-shaped internal thread block 501 is slidably connected to the sliding frame 2. A multi-section telescopic cylinder 502 is fixedly installed at the bottom of the T-shaped internal thread block 501. The bottom end of the multi-section telescopic cylinder 502 is hingedly installed with a welding machine 503. Two rotating rods 504 are rotatably installed on the welding machine 503. Limiting sliding grooves 505 are respectively formed on the left inner wall and the right inner wall of the carriage 1. Two rectangular sliding grooves 506 are respectively formed in the two rotating rods 504. Movable springs 507 are respectively fixedly installed on the inner walls of the several rectangular sliding grooves 506 close to each other. T-shaped ladder rods 508 are respectively fixedly installed at the ends of the several movable springs 507 away from each other. The ends of the several T-shaped ladder rods 508 away from each other respectively extend into the two limiting sliding grooves 505 and are respectively slidably connected to the two limiting sliding grooves 505.

[0037] As Figure 1 As shown in the figure, two limiting rails 509 are arranged in the carriage 1. A plurality of fixing plates 510 are respectively fixedly installed on the two limiting rails 509. Two U-shaped sliding rods 511 are fixedly installed on the front surface of the carriage 1. The two U-shaped sliding rods 511 respectively penetrate through the two limiting rails 509 and are respectively slidably connected to the two limiting rails 509. A strip-shaped cushion block 512 is fixedly installed at the bottom of the two limiting rails 509.

[0038] When the T-shaped ladder rod 508 leaves the limiting sliding groove 505 and just touches the limiting rail 509, it will slide into the rectangular sliding groove 506, which is convenient for the T-shaped ladder rod 508 to enter the limiting rail 509 to complete the connection work. At this time, the limiting rail 509 will descend under the gravity of the welding machine 503 until it touches the ground, thereby reducing the workload of manually transporting the welding machine 503 and improving the convenience.

[0039] As Figure 5 As shown in the figure, a limiting mechanism 6 is arranged on the welding machine 503. The limiting mechanism 6 includes limiting round rods 601 respectively fixedly installed on the left side and the right side of the welding machine 503. Two limiting strips 602 are arranged in the carriage 1. Flared limiting rails 603 are respectively fixedly installed on the sides of the two limiting strips 602 close to each other. The ends of the two limiting round rods 601 away from each other respectively extend into the two flared limiting rails 603. The two limiting round rods 601 are respectively adapted to the two flared limiting rails 603.

[0040] The T-shaped ladder rod 508 will drive the welding machine 503 to move smoothly under the limiting action of the limiting sliding groove 505. The welding machine 503 drives the limiting round rod 601 to move. The flared limiting rail 603 will descend under the continuous movement of the limiting round rod 601. When the limiting round rod 601 moves to the flared position of the flared limiting rail 603, the flared limiting rail 603 will drive the limiting strip 602 to descend under the gravity of the welding machine 503.

[0041] like Figure 6 As shown, a limit frame 604 is fixedly installed at the bottom of the sliding frame 2, a strip cross plate 605 is slidably installed inside the limit frame 604, two limit springs 606 are fixedly installed on the top of the strip cross plate 605, the top ends of the two limit springs 606 are fixedly connected to the limit frame 604, and the bottom ends of the two limit strips 602 are fixedly connected to the strip cross plate 605.

[0042] After the T-shaped ladder bar 508 leaves the limit rail 509, when the limit round rod 601 goes downhill in the trumpet-shaped limit rail 603, the strip cross plate 605 will rise under the elastic force of the limit spring 606. At this time, the corresponding limit rail 509 and the limit bar 602 will rise, and the limit rail 509 will leave the ground to prevent damage to the limit rail 509 caused by collision when the loading vehicle moves.

[0043] like Figure 6 As shown, an L-shaped plate 607 is fixedly installed on the bottom of the strip-shaped horizontal plate 605 , and a connecting horizontal plate 608 is fixedly installed on the back of the L-shaped plate 607 . The connecting horizontal plate 608 is fixedly connected to the two limit rails 509 .

[0044] The strip-shaped horizontal plate 605 drives the L-shaped plate 607 to descend, and the L-shaped plate 607 drives the connecting horizontal plate 608 to descend, and the connecting horizontal plate 608 drives the limiting rail 509 to descend to a position parallel to the T-shaped ladder rod 508.

[0045] like Figure 7 As shown, a dust removal mechanism 7 is provided on the front of the sliding frame 2, and the dust removal mechanism 7 includes a bellows 701 fixedly installed on the front of the sliding frame 2, the front end of the threaded rod 4 extends into the bellows 701 and is rotatably connected to the bellows 701, a plurality of air inlet holes 702 are opened on the front of the bellows 701, a plurality of fan blades 703 are fixedly installed on the outer wall of the threaded rod 4, an L-shaped air outlet pipe 704 is fixedly installed on the bottom of the bellows 701, and a blow hood 705 is fixedly installed on the bottom of the sliding frame 2, and the end of the L-shaped air outlet pipe 704 is communicated with the blow hood 705.

[0046] When the welding machine 503 is used outside the carriage 1, the threaded rod 4 will drive several fan blades 703 to rotate. The fan blades 703 will generate suction force and inhale the outside air through the air inlet 702, and then blow it to the running welding machine 503 through the L-shaped air outlet pipe 704 and the blowing hood 705. Blowing can promote the flow of air, disperse these harmful gases and smoke in time, reduce the concentration of harmful substances in the air around the operator, and reduce the damage of harmful gases to personnel.

[0047] like Figure 7As shown, an adaptable spring 706 is fixedly installed on the front inner wall of the sliding frame 2, a hollow adaptable plate 707 is slidably installed in the sliding frame 2, the threaded rod 4 passes through the hollow adaptable plate 707, and the end of the adaptable spring 706 is fixedly connected to the hollow adaptable plate 707.

[0048] When the T-shaped internal thread block 501 drives the welding machine 503 to move outside the carriage 1, the T-shaped internal thread block 501 will contact the hollow adaptation plate 707, and the hollow adaptation plate 707 will cause the adaptation spring 706 to be compressed and deformed. When the T-shaped internal thread block 501 leaves the thread of the threaded rod 4, the T-shaped internal thread block 501 will be in a semi-disconnected state under the elastic force of the adaptation spring 706, and will not affect the normal rotation of the threaded rod 4.

[0049] like Figure 1-8 As shown, a method for a portable welding device for an engineering machinery vehicle, the method steps are as follows:

[0050] S1: Preliminary change of track;

[0051] S2: Track landing improves stability;

[0052] S3: Reduce the inhalation of harmful gases.

[0053] When in use, the driving motor 3 is started, the driving motor 3 drives the threaded rod 4 to rotate, the threaded rod 4 drives the T-shaped internal thread block 501 to move away from the driving motor 3, the T-shaped internal thread block 501 drives the multi-section telescopic cylinder 502 to move, the multi-section telescopic cylinder 502 drives the welding machine 503 to move, the welding machine 503 drives the rotating rod 504 to move, the rotating rod 504 drives the T-shaped ladder rod 508 to move, the T-shaped ladder rod 508 will drive the welding machine 503 to move smoothly under the limiting action of the limiting slide groove 505, the welding machine 503 drives the limiting round rod 601 to move, and the trumpet-shaped limiting rail 603 will drop under the action of the continuous movement of the limiting round rod 601. When the limiting round rod 601 moves to the trumpet-shaped position of the trumpet-shaped limiting rail 603, the trumpet-shaped limiting rail 603 will drive the limiting bar 602 to descend under the gravity of the welding machine 503, and the limiting bar 602 drives the strip cross plate 605 to descend. At this time, the limiting spring 606 is stretched and deformed, and the strip cross plate 605 drives the L-shaped plate 607 to descend, and the L-shaped plate 607 drives the connecting cross plate 608 to descend. The connecting cross plate 608 drives the limiting rail 509 to descend to a position parallel to the T-shaped ladder rod 508. The T-shaped ladder rod 508 will slide into the rectangular slide groove 506 when it leaves the limiting slide groove 505 and just contacts the limiting rail 509, which is convenient for the T-shaped ladder rod 5 08 enters the limit rail 509 to complete the track connection work. At this time, the limit rail 509 will drop under the gravity of the welding machine 503 until it touches the ground, thereby reducing the workload of manual handling of the welding machine 503 and improving convenience; after the T-shaped ladder bar 508 enters the limit rail 509, as the welding machine 503 continues to move, the welding machine 503 will drive the limit round rod 601 to slide out of the trumpet-shaped limit rail 603. At this time, the trumpet-shaped limit rail 603 will not limit the limit round rod 601. At this time, the welding machine 503 will not get stuck when going up and down the limit rail 509. When the T-shaped ladder bar 508 contacts the limit rail 5 At 09, the limit spring 606 will be in a compressed state. After the welding machine 503 is used up, the driving motor 3 is reversed again. At this time, the welding machine 503 will return to the original path, and the limit round rod 601 on the welding machine 503 will directly enter the trumpet-shaped limit rail 603. After the T-shaped ladder rod 508 leaves the limit rail 509, when the limit round rod 601 goes downhill in the trumpet-shaped limit rail 603, the strip cross plate 605 will rise under the elastic force of the limit spring 606. At this time, the corresponding limit rail 509 and the limit bar 602 will rise, and the limit rail 509 will leave the ground to prevent the limit rail 509 from being damaged due to collision when the loading vehicle moves.

[0054] When the T-shaped internal thread block 501 drives the welding machine 503 to move outside the carriage 1, the T-shaped internal thread block 501 will contact the hollow adaptation plate 707, and the hollow adaptation plate 707 will cause the adaptation spring 706 to be compressed and deformed. When the T-shaped internal thread block 501 leaves the thread of the threaded rod 4, the T-shaped internal thread block 501 will be in a semi-disconnected state under the elastic force of the adaptation spring 706, and will not affect the normal rotation of the threaded rod 4. When the welding machine 503 is used outside the carriage 1, the threaded rod 4 will drive a number of fan blades 703 to rotate. The fan blades 703 will generate suction force and inhale outside air through the air inlet 702, and then blow it to the running welding machine 503 through the L-shaped air outlet pipe 704 and the blowing hood 705. Blowing can promote the flow of air, disperse these harmful gases and smoke in time, reduce the concentration of harmful substances in the air around the operator, and reduce the damage to personnel by harmful gases.

[0055] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A portable welding device for an engineering vehicle, comprising a carriage (1), a sliding frame (2) fixedly mounted on the top inner wall of the carriage (1), a drive motor (3) fixedly mounted on the back inner wall of the carriage (1), a threaded rod (4) rotatably mounted in the sliding frame (2), a distal end of the threaded rod (4) extending outside the sliding frame (2) and fixedly connected to an output shaft of the drive motor (3), characterized in that: Also included are: A movable mechanism (5), the movable mechanism (5) includes a T-shaped internal thread block (501) threadedly sleeved on a threaded rod (4), the T-shaped internal thread block (501) is slidably connected to a sliding frame (2), the bottom of the T-shaped internal thread block (501) is fixedly installed with a multi-section telescopic cylinder (502), the bottom end of the multi-section telescopic cylinder (502) is hinged and installed with a welding machine (503), two rotating rods (504) are rotatably installed on the welding machine (503), limiting sliding grooves (505) are respectively opened on the left inner wall and the right inner wall of the carriage (1), two rectangular sliding grooves (506) are respectively opened in the two rotating rods (504), movable springs (507) are respectively fixedly installed on the inner walls of the mutually adjacent sides of several rectangular sliding grooves (506), the mutually remote ends of several movable springs (507) are respectively fixedly installed with T-shaped ladder rods (508), the mutually remote ends of several T-shaped ladder rods (508) respectively extend into the two limiting sliding grooves (505) and are respectively slidably connected to the two limiting sliding grooves (505); Two limiting rails (509) are arranged in the carriage (1), several fixing plates (510) are respectively fixedly installed on the two limiting rails (509), two U-shaped sliding rods (511) are fixedly installed on the front surface of the carriage (1), the two U-shaped sliding rods (511) respectively penetrate through the two limiting rails (509) and are respectively slidably connected to the two limiting rails (509), and strip-shaped pads (512) are fixedly installed at the bottoms of the two limiting rails (509); A limiting mechanism (6) is arranged on the welding machine (503), the limiting mechanism (6) includes limiting round rods (601) respectively fixedly installed on the left side and the right side of the welding machine (503), two limiting strips (602) are arranged in the carriage (1), horn-shaped limiting rails (603) are respectively fixedly installed on the mutually adjacent sides of the two limiting strips (602), the mutually remote ends of the two limiting round rods (601) respectively extend into the two horn-shaped limiting rails (603), and the two limiting round rods (601) respectively match with the two horn-shaped limiting rails (603); A limiting frame (604) is fixedly installed at the bottom of the sliding frame (2), a strip-shaped horizontal plate (605) is slidably installed in the limiting frame (604), two limiting springs (606) are fixedly installed at the top of the strip-shaped horizontal plate (605), the top ends of the two limiting springs (606) are both fixedly connected to the limiting frame (604), and the bottom ends of the two limiting strips (602) are both fixedly connected to the strip-shaped horizontal plate (605); An L-shaped plate (607) is fixedly installed at the bottom of the strip-shaped horizontal plate (605), a connecting horizontal plate (608) is fixedly installed on the back surface of the L-shaped plate (607), and the connecting horizontal plate (608) is fixedly connected to the two limiting rails (509).

2. A portable welding device for construction machinery vehicles according to claim 1, characterized in that: A dust removal mechanism (7) is provided on the front of the sliding frame (2), the dust removal mechanism (7) comprising a bellows (701) fixedly mounted on the front of the sliding frame (2), the front end of the threaded rod (4) extending into the bellows (701) and being rotatably connected to the bellows (701), a plurality of air inlet holes (702) being provided on the front of the bellows (701), a plurality of fan blades (703) being fixedly mounted on the outer wall of the threaded rod (4), an L-shaped air outlet pipe (704) being fixedly mounted on the bottom of the bellows (701), a blow hood (705) being fixedly mounted on the bottom of the sliding frame (2), and a distal end of the L-shaped air outlet pipe (704) being in communication with the blow hood (705).

3. A portable welding device for construction machinery vehicles according to claim 2, characterized in that: An adaptable spring (706) is fixedly mounted on the front inner wall of the sliding frame (2), a hollow adaptable plate (707) is slidably mounted inside the sliding frame (2), the threaded rod (4) passes through the hollow adaptable plate (707), and the end of the adaptable spring (706) is fixedly connected to the hollow adaptable plate (707).

4. A method for using a portable welding device for an engineering vehicle, using the portable welding device for an engineering vehicle as claimed in claim 3, characterized in that: The steps are as follows: S1: starting the driving motor (3), the driving motor (3) drives the threaded rod (4) to rotate, the threaded rod (4) drives the T-shaped internal thread block (501) to move in a direction away from the driving motor (3), the T-shaped internal thread block (501) drives the multi-section telescopic cylinder (502) to move, the multi-section telescopic cylinder (502) drives the welding machine (503) to move, the welding machine (503) drives the rotating rod (504) to move, the rotating rod (504) drives the T-shaped ladder rod (508) to move, the T-shaped ladder rod (508) will drive the welding machine (503) to move smoothly under the limiting action of the limiting slide groove (505), the welding machine (503) drives the limiting round rod (601) to move, the trumpet-shaped limiting rail (603) will descend under the action of the continuous movement of the limiting round rod (601), when the limiting round rod (601) moves to the trumpet-shaped position of the trumpet-shaped limiting rail (603), When the welding machine (503) is in the state of being set, the trumpet-shaped limit rail (603) will drive the limit bar (602) to descend under the gravity of the welding machine (503), and the limit bar (602) will drive the strip-shaped horizontal plate (605) to descend. At this time, the limit spring (606) is stretched and deformed, and the strip-shaped horizontal plate (605) drives the L-shaped plate (607) to descend. The L-shaped plate (607) drives the connecting horizontal plate (608) to descend, and the connecting horizontal plate (608) drives the limit rail (509) to descend to a position parallel to the T-shaped ladder rod (508). When the T-shaped ladder rod (508) leaves the limit slide groove (505) and just contacts the limit rail (509), it will slide into the rectangular slide groove (506), so that the T-shaped ladder rod (508) can enter the limit rail (509) to complete the track connection work. At this time, the limit rail (509) will descend under the gravity of the welding machine (503) until it contacts the ground; S2: After the T-shaped ladder bar (508) enters the limit rail (509), as the welding machine (503) continues to move, the welding machine (503) will drive the limit round bar (601) to slide out of the trumpet-shaped limit rail (603). At this time, the trumpet-shaped limit rail (603) will not limit the limit round bar (601). At this time, the welding machine (503) will not get stuck when the limit rail (509) goes up and down. When the T-shaped ladder bar (508) contacts the limit rail (509), the limit spring (606) will always be in a compressed state. 3) After use, the driving motor (3) is reversed again, and the welding machine (503) will return to the original path, and the limiting round rod (601) on the welding machine (503) will directly enter the trumpet-shaped limiting rail (603). After the T-shaped ladder rod (508) leaves the limiting rail (509), when the limiting round rod (601) goes downhill in the trumpet-shaped limiting rail (603), the strip-shaped horizontal plate (605) will rise under the elastic force of the limiting spring (606), and the corresponding limiting rail (509) and the limiting strip (602) will rise, and the limiting rail (509) will leave the ground; S3: When the T-shaped internal thread block (501) drives the welding machine (503) to move outside the carriage (1), the T-shaped internal thread block (501) contacts the hollow adaptable plate, and the hollow adaptable plate causes the adaptable spring (706) to be compressed and deformed. When the T-shaped internal thread block (501) leaves the thread of the threaded rod (4), the T-shaped internal thread block (501) is in a semi-disconnected state under the elastic force of the adaptable spring (706), and will not affect the normal rotation of the threaded rod (4). When the welding machine (503) is used outside the carriage (1), the threaded rod (4) drives a plurality of fan blades (703) to rotate. The fan blades (703) generate a suction force and inhale the outside air through the air inlet (702), and then blow it toward the running welding machine (503) through the L-shaped air outlet pipe (704) and the blow hood (705). Blowing can promote the flow of air.

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