Metal railing welding machine

Abstract

This invention discloses a metal railing welding machine. The invention relates to the field of metal welding equipment and includes: a chassis; a main clamping cylinder is provided at one end of the top of the chassis; an auxiliary clamping cylinder is provided at the other end of the top of the chassis; a railing body is transversely inserted through the middle of the inner sides of the main clamping cylinder and the auxiliary clamping cylinder; and an electrical control box is provided at one end of the chassis. When the main clamping cylinder moves, it drives the inclined push block to push the force-bearing inclined plate, causing the rack to slide and drive the rotating shaft to rotate. A transmission belt causes the first rotating wheel to rotate, which in turn drives the first curved arm to move, causing the second guide rod to move within the limited-slip frame. This causes the burr-removing cylinder and scraper to slide outside the railing body. The blade structure of the scraper can grind and remove burrs from the outside of the railing body, achieving burr removal before or after welding and improving the surface quality of the railing body.

Description

Technical Field

[0001] This invention relates to the field of metal welding equipment technology, specifically a metal railing welding machine. Background Technology

[0002] During the welding process of metal railings, burrs are easily generated on the surface of the railing body after welding. If they are not cleaned in time, they will affect the appearance quality of the railings and subsequent processing and use. At the same time, in the field of metal welding, the cleaning of impurities and burrs on the surface of the workpiece before welding is also a common problem that relies on manual labor, which is inefficient and the cleaning effect is unstable.

[0003] Publication number CN220347521U describes an automatic metal railing welding machine that uses a ring welding device for welding. The ring welding device is moved by the cooperation of a threaded rod, a slider, and a support column. The railing fixing device is rotatably connected to the base and slidably connected, thereby solving the welding problem of metal railings at different angles.

[0004] However, although it is possible to weld metal railings at different angles, it is impossible to remove the burrs on the outside of the railing body after welding. Manual burr cleaning is still required, which not only increases labor costs but also reduces the overall efficiency of the welding process.

[0005] Therefore, in order to address the existing shortcomings, we conducted research and improvements and proposed a metal railing welding machine. Summary of the Invention

[0006] The purpose of this invention is to provide a metal railing welding machine to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a metal railing welding machine, comprising: a machine housing, a main clamping cylinder provided at one end of the top of the machine housing, an auxiliary clamping device provided at the other end of the top of the machine housing, a railing body being transversely inserted through the middle of the inner sides of the main clamping cylinder and the auxiliary clamping device, an electrical control box body being provided at one end of the machine housing, and a welding torch being provided at one end of the electrical control box body;

[0008] An electrically controlled telescopic rod is provided at the middle of the bottom outer side of the main clamping cylinder, and protrusions are provided on both sides of the bottom of the main clamping cylinder. A sliding shaft is provided transversely through the inner side of the protrusion.

[0009] A cleaning mechanism is provided at one end of the outside of the railing body. The cleaning mechanism includes a cleaning cylinder, which is sleeved on the outside of the railing body.

[0010] A material discharge mechanism is provided at the other end of the railing body. The material discharge mechanism includes a material support wrench, which is located at the top of the other end of the railing body.

[0011] An auxiliary mechanism is provided on the outside of the main clamping cylinder near the auxiliary clamping device. The auxiliary mechanism includes a water cylinder, which is located at both the front and rear ends of the main clamping cylinder near the auxiliary clamping device.

[0012] Furthermore, the cleaning mechanism also includes a first transmission belt, a first pulley, a first crank arm, a limiting frame, a subframe, a gear, a shaft, a rack, a third pulley, a scraper, a guide ring, a second guide rod, an inclined push block, a force-bearing inclined plate, and a spring. A scraper is annularly arranged on the inner side of the cleaning cylinder. A guide ring is sleeved on the front end of the outer side of the cleaning cylinder. A second guide rod is located at the bottom of the guide ring. A limiting frame is located at the bottom of the second guide rod. A first crank arm is located at the lower end of the outer side of the second guide rod. A [missing information - likely a component or element] is located on one side of the first crank arm. A first rotating wheel is provided with a first transmission belt on its outer side. A third rotating wheel is provided on the other side of the inner side of the first transmission belt. A rotating shaft is vertically provided on the inner side of the third rotating wheel. A gear is sleeved in the middle of the outer side of the rotating shaft. A rack is provided on the back of the gear. A horizontal shaft is provided through the inner side of the rack. A spring is provided on one side of the outer side of the horizontal shaft. A subframe is provided on the outer side of the horizontal shaft. A force-bearing inclined plate is provided on the back of the rack. The inclined push block is provided on the outer side of the main clamping cylinder near the force-bearing inclined plate.

[0013] Furthermore, the geometric center of the inclined push block and the geometric center of the force-bearing inclined plate are on the same straight line, and the inclined push block and the main clamping cylinder are fixedly connected.

[0014] Furthermore, the rack and the horizontal shaft form a sliding structure, and the subframe and the chassis are fixedly connected.

[0015] Furthermore, the discharge mechanism also includes a first guide rod, a second crank arm, a second rotating wheel, a second transmission belt, and a fourth rotating wheel. The first guide rod is provided at the bottom of one side of the material support wrench, the second crank arm is provided at the bottom of the first guide rod, the second rotating wheel is provided at one end of the second crank arm, the second transmission belt is sleeved on the outside of the second rotating wheel, and the fourth rotating wheel is provided at one end of the inner side of the second transmission belt.

[0016] Furthermore, the structure of the support wrench that fits against the outside of the railing body is a semi-circular structure, and the support wrench is fixedly connected to the first guide rod.

[0017] Furthermore, the rotation direction of the second wheel is the same as that of the fourth wheel, and the geometric center of the second wheel and the geometric center of the fourth wheel are on the same straight line.

[0018] Furthermore, the auxiliary mechanism also includes a water outlet pipe, a water tank, a push rod, a push plate, a slider, an attachment block, and a third crank arm. The top of the water cylinder is provided with a water outlet pipe, the tail end of the water cylinder is provided with a water inlet pipe, one end of the water inlet pipe is provided with a water tank, the inner side of the water cylinder is provided with a push plate, one end of the push plate is provided with a push rod, one end of the push rod is provided with a push plate, one end of the push plate is provided with a third crank arm, the bottom of the push plate is provided with a slider, and the outside of the slider is provided with an attachment block.

[0019] Furthermore, the third crank arm is sleeved to the rotating shaft, and the attachment block is slidably connected to the slider.

[0020] Furthermore, the slider moves along the central axis of the attached block, and the push plate and the push rod are fixedly connected.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. When the main clamping cylinder moves, it drives the inclined push block to push the force-bearing inclined plate, causing the rack to slide and drive the rotating shaft to rotate. The first rotating wheel rotates through the transmission belt, which in turn drives the first curved arm to move, causing the second guide rod to move within the limited sliding frame. This causes the cleaning cylinder and scraper to slide outside the railing body. The blade structure of the scraper can grind and remove the burrs on the outside of the railing body, realizing the cleaning of burrs before or after welding of the railing body, and improving the surface quality of the railing body.

[0023] 2. This invention uses a rotating shaft to drive the fourth rotating wheel to rotate, which in turn drives the second rotating wheel to rotate via a second transmission belt. This, in turn, moves the second curved arm, causing the first guide rod to move horizontally and thus the material-supporting wrench to move. The semi-circular structure of the material-supporting wrench fits against the railing body, allowing it to move horizontally. At this point, the auxiliary clamp lock is released, enabling automatic material discharge of the railing body without manual handling. This saves manpower, improves discharge efficiency, and ensures the stability of the discharge process, preventing damage to the railing body caused by manual operation.

[0024] 3. This invention uses the rotation of the pivot shaft to drive the movement of the third curved arm, causing the slider to move horizontally within the block, which in turn drives the push plate, push rod, and push plate inside the water tank to move. This allows the water tank's inlet pipe to draw in the flux liquid from the water tank, which is then sprayed out through the outlet pipe to the joint of the railing body, increasing the welding effect of the railing body and improving the strength and stability of the weld. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the metal railing welding machine of the present invention;

[0026] Figure 2 The metal railing welding machine of the present invention Figure 1A magnified structural diagram at point A;

[0027] Figure 3 This is a schematic diagram of the overall structure of the metal railing welding machine of the present invention from another angle;

[0028] Figure 4 The metal railing welding machine of the present invention Figure 3 A magnified structural diagram at point B;

[0029] Figure 5 The metal railing welding machine of the present invention Figure 3 A magnified structural diagram at point C;

[0030] Figure 6 This is another schematic diagram of the overall structure of the metal railing welding machine of the present invention from an angle;

[0031] Figure 7 The metal railing welding machine of the present invention Figure 6 A magnified structural diagram at point D;

[0032] Figure 8 This is a schematic diagram of the overall structure of the metal railing welding machine of the present invention from another angle;

[0033] Figure 9 The metal railing welding machine of the present invention Figure 8 Enlarged structural diagram at point E.

[0034] In the diagram: 1. Chassis; 2. First transmission belt; 3. First pulley; 4. First crank arm; 5. Limited slip frame; 6. Cleaning cylinder; 7. Auxiliary clamp; 8. Welding torch; 9. Main clamp; 10. Guardrail body; 11. Material support wrench; 12. First guide rod; 13. Second crank arm; 14. Second pulley; 15. Subframe; 16. Gear; 17. Shaft; 18. Rack; 19. Second transmission belt 20. Belt; 21. Third rotating wheel; 22. Fourth rotating wheel; 23. Electrical control box body; 24. Attached block; 25. Slider; 26. Push plate; 27. Scraper; 28. Guide ring; 29. ​​Second guide rod; 30. Inclined push block; 31. Force-bearing inclined plate; 32. Spring; 33. Water cylinder; 34. Push rod; 35. Water tank; 36. Water outlet pipe; 37. Electrically controlled telescopic rod; 38. Sliding shaft; 39. Third crank arm. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Example:

[0037] like Figures 1 to 9 As shown, a metal railing welding machine includes: a machine housing 1, a main clamping cylinder 9 is provided at one end of the top of the machine housing 1, an auxiliary clamping device 7 is provided at the other end of the top of the machine housing 1, a railing body 10 is transversely arranged through the middle of the inner side of the main clamping cylinder 9 and the auxiliary clamping device 7, an electrical control box body 22 is provided at one end of the machine housing 1, and a welding gun 8 is provided at one end of the electrical control box body 22;

[0038] An electrically controlled telescopic rod 36 is provided at the middle of the bottom outer side of the main clamping cylinder 9. Protrusions are provided on both sides of the bottom of the main clamping cylinder 9, and a sliding shaft 37 is provided transversely through the inner side of the protrusion.

[0039] A cleaning mechanism is provided at one end of the railing body 10. The cleaning mechanism includes a cleaning cylinder 6, which is sleeved on the outside of the railing body 10.

[0040] A material discharge mechanism is provided at the other end of the railing body 10. The material discharge mechanism includes a material support wrench 11, which is located at the top of the other end of the railing body 10.

[0041] An auxiliary mechanism is provided on the outside of the main clamping cylinder 9 near the auxiliary clamping cylinder 7. The auxiliary mechanism includes a water cylinder 32, which is located at the front and rear ends of the outside of the main clamping cylinder 9 near the auxiliary clamping cylinder 7.

[0042] The user places the railing body 10 horizontally and places it inside the auxiliary clamp 7 and the main clamp 9. Then, the user starts the electrical control box 22, which powers the welding torch 8. The welding torch 8 is then activated. After the gap at the connection of the railing body 10 is welded by the welding torch 8, the user starts the electric telescopic rod 36. The pivot end of the electric telescopic rod 36 drives the main clamp 9 to move.

[0043] When the electric telescopic rod 36 moves the main clamping cylinder 9 forward, the distance between the auxiliary clamping device 7 and the main clamping cylinder 9 increases. The user can open the preset locking switch on the outside of the auxiliary clamping device 7 so that the auxiliary clamping device 7 no longer clamps the railing body 10, and the weld on the outside of the railing body 10 will move forward.

[0044] Similarly, when the electric telescopic rod 36 moves the main clamping cylinder 9 backward, the distance between the auxiliary clamping device 7 and the main clamping cylinder 9 decreases. The user can open the preset locking switch on the outside of the auxiliary clamping device 7 so that the auxiliary clamping device 7 no longer clamps the railing body 10, and the weld on the outside of the railing body 10 will move backward.

[0045] In addition, when the main clamping cylinder 9 is moving, the sliding shaft 37 will help the main clamping cylinder 9 to slide horizontally.

[0046] Example 1: As Figures 1 to 9 As shown, the cleaning mechanism also includes a first transmission belt 2, a first rotating wheel 3, a first crank arm 4, a limited-slip frame 5, a subframe 15, a gear 16, a rotating shaft 17, a rack 18, a third rotating wheel 20, a scraper 26, a guide ring 27, a second guide rod 28, an inclined push block 29, a force-bearing inclined plate 30, and a spring 31. A scraper 26 is annularly arranged on the inner side of the cleaning cylinder 6. A guide ring 27 is sleeved on the front end of the outer side of the cleaning cylinder 6. A second guide rod 28 is arranged at the bottom of the guide ring 27. A limited-slip frame 5 is arranged at the bottom of the second guide rod 28. A first crank arm 4 is arranged at the lower end of the outer side of the second guide rod 28. A first rotating wheel 3 is provided on one side of the main clamping cylinder 9. A first transmission belt 2 is provided on the outside of the first rotating wheel 3. A third rotating wheel 20 is provided on the other side of the inner side of the first transmission belt 2. A rotating shaft 17 is vertically provided on the inner side of the third rotating wheel 20. A gear 16 is sleeved in the middle of the outer side of the rotating shaft 17. A rack 18 is provided on the back of the gear 16. A horizontal shaft is provided through the inner side of the rack 18. A spring 31 is provided on one side of the outer side of the horizontal shaft. A subframe 15 is provided on the outer side of the horizontal shaft. A force-bearing inclined plate 30 is provided on the back of the rack 18. An inclined push block 29 is provided on the outer side of the main clamping cylinder 9 near the force-bearing inclined plate 30.

[0047] The geometric center of the inclined push block 29 and the geometric center of the force-bearing inclined plate 30 are on the same straight line, and the inclined push block 29 and the main clamping cylinder 9 are fixedly connected.

[0048] The rack 18 and the horizontal axis form a sliding structure, and the subframe 15 and the chassis 1 are fixedly connected.

[0049] When the main clamping cylinder 9 moves due to the drive of the electrically controlled telescopic rod 36, the main clamping cylinder 9 drives the inclined push block 29 to move, the inclined push block 29 pushes the force-bearing inclined plate 30, the force-bearing inclined plate 30 moves under force, and the force-bearing inclined plate 30 drives the rack 18 to slide outside the horizontal axis.

[0050] When the horizontal axis slides, the spring 31 can provide a reset function for the assembly of the spring 31 and the rack 18. When the rack 18 moves, the rack 18 drives the rotating shaft 17 to rotate, the rotating shaft 17 drives the third rotating wheel 20 to rotate, the third rotating wheel 20 drives the first transmission belt 2 to rotate, the first transmission belt 2 drives the first rotating wheel 3 to rotate, and the first rotating wheel 3 will drive the first curved arm 4 to move when it rotates. When the first curved arm 4 moves, one end of it drives the second guide rod 28 to make a linear movement inside the limited sliding frame 5.

[0051] When the second guide rod 28 moves, it drives the guide ring 27 to move horizontally. When the guide ring 27 moves, it can drive the cleaning cylinder 6 to slide back and forth on the outside of the railing body 10. When the cleaning cylinder 6 moves, it can drive the scraper 26 to slide on the outside of the railing body 10. Since the scraper 26 has a flat blade structure that contacts the surface of the railing body 10, when the scraper 26 slides on the outside of the railing body 10, the blade structure of the scraper 26 can grind and remove the burrs on the outside of the railing body 10.

[0052] Example 2: Figures 1 to 9 As shown, the discharge mechanism also includes a first guide rod 12, a second crank arm 13, a second rotating wheel 14, a second transmission belt 19, and a fourth rotating wheel 21. The first guide rod 12 is provided at the bottom of one side of the material support wrench 11, the second crank arm 13 is provided at the bottom of the first guide rod 12, the second rotating wheel 14 is provided at one end of the second crank arm 13, the second transmission belt 19 is sleeved on the outside of the second rotating wheel 14, and the fourth rotating wheel 21 is provided at one end of the inner side of the second transmission belt 19.

[0053] The support wrench 11 has a semi-circular structure that fits onto the outside of the railing body 10, and the support wrench 11 is fixedly connected to the first guide rod 12.

[0054] The rotation direction of the second rotating wheel 14 is the same as that of the fourth rotating wheel 21, and the geometric center of the second rotating wheel 14 and the geometric center of the fourth rotating wheel 21 are on the same straight line.

[0055] First, the user does not open the pre-set locking switch on the outside of the auxiliary clamping device 7, and then opens the pre-set locking switch on the main clamping device 9. At this time, when the rotating shaft 17 is rotating, the rotating shaft 17 drives the fourth rotating wheel 21 to rotate, the fourth rotating wheel 21 drives the second transmission belt 19 to rotate, and the second transmission belt 19 drives the second rotating wheel 14 to rotate.

[0056] When the second rotating wheel 14 rotates, it drives the second curved boom 13 to move. When the second curved boom 13 moves, one end of the second curved boom 13 drives the first guide rod 12 to move horizontally. The first guide rod 12 then drives the material support wrench 11 to move horizontally. The semi-circular structure of the material support wrench 11 fits against the outside of the railing body 10. Therefore, when the material support wrench 11 moves, it can drive the railing body 10 to move horizontally. At this time, the user opens the preset lock of the auxiliary clamp 7 again. In this way, the railing body 10, which is clamped inside the main clamping cylinder 9 and the auxiliary clamp 7, will be taken away by the material support wrench 11 to realize the function of material discharge.

[0057] Example 3: Figures 1 to 9As shown, the auxiliary mechanism also includes a water outlet pipe 35, a water tank 34, a push rod 33, a push plate 25, a slider 24, an attachment block 23, and a third curved arm rod 38. The top of the water cylinder 32 is provided with a water outlet pipe 35, and the tail end of the water cylinder 32 is provided with a water inlet pipe. One end of the water inlet pipe is provided with a water tank 34. The inner side of the water cylinder 32 is provided with a push plate. One end of the push plate is provided with a push rod 33. One end of the push rod 33 is provided with a push plate 25. One end of the push plate 25 is provided with a third curved arm rod 38. The bottom of the push plate 25 is provided with a slider 24, and the outside of the slider 24 is provided with an attachment block 23.

[0058] The third crank arm 38 is sleeved to the rotating shaft 17, and the attached block 23 is slidably connected to the slider 24;

[0059] The slider 24 moves along the central axis of the attached block 23, and the push plate 25 and the push rod 33 are fixedly connected.

[0060] When the rotating shaft 17 rotates, it drives the third curved arm 38 to move. One end of the third curved arm 38 can drive the slider 24 to move horizontally inside the attachment block 23. When the slider 24 moves horizontally, it will drive the push plate 25 to move horizontally as well. When the push plate 25 moves, it can drive the push rod 33 and the push plate to move back and forth inside the water cylinder 32, so that the water inlet pipe of the water cylinder 32 draws the flux liquid inside the water tank 34. Then the water cylinder 32 sprays the flux liquid through the water outlet pipe 35 to the joint of the railing body 10, thereby increasing the welding effect of the railing body 10.

[0061] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A metal railing welding machine, comprising: The chassis (1) is characterized in that a main clamping cylinder (9) is provided at one end of the top of the chassis (1), and an auxiliary clamping device (7) is provided at the other end of the top of the chassis (1). A railing body (10) is provided horizontally through the middle of the inner side of the main clamping cylinder (9) and the auxiliary clamping device (7). An electrical control box body (22) is provided at one end of the chassis (1), and a welding torch (8) is provided at one end of the electrical control box body (22). An electrically controlled telescopic rod (36) is provided at the middle of the bottom of the outer side of the main clamping cylinder (9). Protrusions are provided on both sides of the bottom of the main clamping cylinder (9), and a sliding shaft (37) is provided transversely through the inner side of the protrusion. A cleaning mechanism is provided at one end of the outside of the railing body (10), the cleaning mechanism including a cleaning cylinder (6), the cleaning cylinder (6) being sleeved on the outside of the railing body (10); The other end of the railing body (10) is provided with a material discharge mechanism, which includes a material support wrench (11) and is located at the top of the other end of the railing body (10). An auxiliary mechanism is provided on the side of the main clamping cylinder (9) near the auxiliary clamping device (7). The auxiliary mechanism includes a water cylinder (32), which is located at the front and rear ends of the main clamping cylinder (9) near the auxiliary clamping device (7).

2. The metal railing welding machine according to claim 1, characterized in that, The cleaning mechanism also includes a first transmission belt (2), a first rotating wheel (3), a first crank arm (4), a limited sliding frame (5), a subframe (15), a gear (16), a rotating shaft (17), a rack (18), a third rotating wheel (20), a scraper (26), a guide ring (27), a second guide rod (28), an inclined push block (29), a force-bearing inclined plate (30), and a spring (31). The inner side of the cleaning cylinder (6) is provided with a scraper (26), and the front end of the cleaning cylinder (6) is fitted with a guide ring (27). The bottom of the guide ring (27) is provided with a second guide rod (28), the bottom of the second guide rod (28) is provided with a limited sliding frame (5), and the lower end of the second guide rod (28) is provided with a first crank arm (4). A first rotating wheel (3) is provided on one side of the rod (4). A first transmission belt (2) is provided on the outside of the first rotating wheel (3). A third rotating wheel (20) is provided on the other side of the inside of the first transmission belt (2). A rotating shaft (17) is vertically provided on the inside of the third rotating wheel (20). A gear (16) is sleeved in the middle of the outside of the rotating shaft (17). A rack (18) is provided on the back of the gear (16). A horizontal shaft is provided through the inside of the rack (18). A spring (31) is provided on one side of the outside of the horizontal shaft. A subframe (15) is provided on the outside of the horizontal shaft. A force-bearing inclined plate (30) is provided on the back of the rack (18). The inclined push block (29) is located on the outside of the main clamping cylinder (9) near the force-bearing inclined plate (30).

3. A metal railing welding machine according to claim 2, characterized in that, The geometric center of the inclined push block (29) and the geometric center of the force-bearing inclined plate (30) are on the same straight line, and the inclined push block (29) and the main clamping cylinder (9) are fixedly connected.

4. A metal railing welding machine according to claim 2, characterized in that, The rack (18) and the horizontal axis form a sliding structure, and the subframe (15) and the chassis (1) are fixedly connected.

5. A metal railing welding machine according to claim 1, characterized in that, The discharge mechanism also includes a first guide rod (12), a second crank arm (13), a second rotating wheel (14), a second transmission belt (19), and a fourth rotating wheel (21). The bottom of one side of the material support wrench (11) is provided with a first guide rod (12), the bottom of the first guide rod (12) is provided with a second crank arm (13), one end of the second crank arm (13) is provided with a second rotating wheel (14), the outside of the second rotating wheel (14) is fitted with a second transmission belt (19), and one end of the inside of the second transmission belt (19) is provided with a fourth rotating wheel (21).

6. A metal railing welding machine according to claim 5, characterized in that, The support wrench (11) is a semi-circular structure that fits against the outside of the railing body (10), and the support wrench (11) is fixedly connected to the first guide rod (12).

7. A metal railing welding machine according to claim 5, characterized in that, The rotation direction of the second wheel (14) is the same as that of the fourth wheel (21), and the geometric center of the second wheel (14) and the geometric center of the fourth wheel (21) are on the same straight line.

8. A metal railing welding machine according to claim 1, characterized in that, The auxiliary mechanism also includes a water outlet pipe (35), a water tank (34), a push rod (33), a push plate (25), a slider (24), an attachment block (23), and a third crank arm (38). The top of the water cylinder (32) is provided with a water outlet pipe (35), the tail end of the water cylinder (32) is provided with a water inlet pipe, one end of which is provided with a water tank (34). The inner side of the water cylinder (32) is provided with a push plate, one end of which is provided with a push rod (33), one end of which is provided with a push plate (25), one end of which is provided with a third crank arm (38), the bottom of which is provided with a slider (24), and the outside of which is provided with an attachment block (23).

9. A metal railing welding machine according to claim 8, characterized in that, The third crank arm (38) is sleeved to the rotating shaft (17), and the attachment block (23) is slidably connected to the slider (24).

10. A metal railing welding machine according to claim 8, characterized in that, The slider (24) moves in the direction of the central axis of the attached block (23), and the push plate (25) and the push rod (33) are fixedly connected.

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