Welding device for hydraulic cylinder

Abstract

The invention belongs to the technical field of hydraulic cylinder welding, and particularly relates to a hydraulic cylinder welding device which comprises a workbench, a motor base is fixed to the workbench, an output shaft of a main motor in the motor base is connected with a three-jaw chuck, a vertical rod is arranged above the workbench, and the face, close to the motor base, of the vertical rod is connected with a U-shaped mounting frame through a rotating shaft. The two ends of the mounting frame are rotationally connected with pressing plates, the pressing plates are elastically connected with the mounting frame, and the vertical rod is connected with the workbench through a transverse moving mechanism. According to the device, the shell of the cylinder body is clamped and fixed through the three-jaw chuck, then the base is inserted into the connecting end of the shell, then the vertical rod and the mounting frame are driven by the transverse moving mechanism to move leftwards as a whole, the two pressing plates are gradually opened through the connecting sleeve on the base, and the pressing plates abut against the shell tightly under the action of elastic force; therefore, the shell and the base can stably and synchronously rotate.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic cylinder welding, and in particular to a welding device for a hydraulic cylinder. Background Art

[0002] The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). It has a simple structure and reliable operation. When using it to achieve reciprocating motion, the reduction device can be eliminated, there is no transmission gap, and the motion is smooth, so it is widely used in the hydraulic systems of various machines. The output force of the hydraulic cylinder is proportional to the effective area of ​​the piston and the pressure difference on both sides; the hydraulic cylinder is basically composed of a cylinder barrel and a cylinder head, a piston and a piston rod, a sealing device, a buffer device and an exhaust device. In the process of manufacturing hydraulic cylinders, existing hydraulic cylinder manufacturers usually split the hydraulic cylinder into multiple parts for large-scale processing. The processed parts of each part are classified and placed in the warehouse. According to the order quantity, the parts of each part can be assembled by extracting them from the existing parts inventory. It is known that electric welding machines are needed for welding in the process of assembling the hydraulic cylinder body.

[0003] In order to solve the problem that "welders need to weld the hydraulic cylinder during rotation", the patent with publication number CN112264761B discloses a welding device for a hydraulic cylinder, including a mounting seat, a first mounting groove is provided on one side of the mounting seat, a clamping assembly for clamping the outer shell for rotation is provided at one end of the first mounting groove, a welding head with a hollow setting is provided in the first mounting groove, both ends of the welding head are connected to the outside world, the welding nozzle of the welding head is vertically downwardly arranged, an adjusting member for adjusting the height of the welding head is provided in the first mounting groove, a rectifier is fixed on the side wall of the mounting seat, the welding nozzle of the welding head is electrically connected to the rectifier through a wire, a second mounting groove is provided on the side of the mounting seat away from the first mounting groove, and a conveying assembly for conveying welding wire to the welding nozzle is provided in the second mounting groove. Although the existing technical problems have been solved, the following problems still exist: In this technical solution, the outer shell of the cylinder body is only clamped and fixed by a three-jaw chuck, while the base is directly inserted into the outer shell. When the outer shell rotates, the base can easily rotate asynchronously with the outer shell, thereby affecting the welding. Therefore, corresponding improvements are made to this problem, and a welding device for a hydraulic cylinder is proposed to ensure that the outer shell and the base can rotate stably and synchronously during welding. Summary of the invention

[0004] Based on the technical problems existing in the prior art, the present invention proposes a welding device for a hydraulic cylinder.

[0005] The present invention proposes a welding device for a hydraulic cylinder, comprising a workbench, a motor seat is fixed on the workbench, the output shaft of the main motor in the motor seat is connected to a three-jaw chuck, a vertical rod is arranged above the workbench, a side of the vertical rod close to the motor seat is connected to a U-shaped mounting frame via a rotating shaft, both ends of the mounting frame are rotatably connected to pressure plates, the pressure plates are elastically connected to the mounting frame, the vertical rod is connected to the workbench via a transverse movement mechanism, the outer shell of the cylinder body is clamped and fixed by the three-jaw chuck, and then the base is inserted into the connecting end of the outer shell, and then the vertical rod and the mounting frame are driven to move to the left as a whole by the transverse movement mechanism, the connecting sleeve on the base gradually spreads the two pressure plates, and under the action of elastic force, the pressure plate presses the base against the outer shell, so that the outer shell and the base can rotate stably and synchronously.

[0006] Preferably, the top and bottom inner walls of the mounting frame are provided with sliding grooves, a slider is slidably connected in the sliding groove, a spring is fixed to one end of the slider, the other end of the spring is fixed to the inner wall of the sliding groove, a connecting rod is rotatably connected to the top of the slider, and the other end of the connecting rod is rotatably connected to the pressure plate.

[0007] Preferably, a pair of limiting blocks are fixed to the contacting side of the pressing plate and the connecting sleeve, for limiting the base from both sides.

[0008] Preferably, the transverse movement mechanism includes a transverse plate fixed on the top of the workbench, with a transverse groove formed on the transverse plate, a moving block fixed to the vertical rod being slidably connected in the transverse groove, and a first screw rod threadedly connected to the moving block being rotatably connected in the transverse groove.

[0009] Preferably, a slot is provided on the back of the mounting frame, and an insertion rod is inserted on the vertical rod, the end of which can be inserted into the slot.

[0010] Preferably, a slide rail is fixed on the top of the workbench, a slide seat is arranged on the slide rail, the slide seat is slidably connected with the slide rail through a groove, the slide seat is connected to the welding head through a lifting mechanism, a fixed seat is fixed on the top of the workbench, a main shaft is rotatably connected to the fixed seat, a hand wheel and a first gear are respectively fixed at both ends of the main shaft, and the first gear is meshingly connected with the rack on the slide seat.

[0011] Preferably, the lifting mechanism comprises a vertical plate fixed on the slide seat, a vertical slot is formed on the vertical plate, a slide rod is slidably connected in the vertical slot, the welding head is fixed on the slide rod, and a second screw rod which is threadedly connected to the slide rod is rotatably connected in the vertical slot.

[0012] Preferably, a frame plate is fixed to the side of the slide bar, an auxiliary motor is fixed to one side of the frame plate, and a pair of feed rollers are rotatably connected to the other side, wherein the end of one of the feed rollers is connected to the output shaft of the auxiliary motor.

[0013] Preferably, an ear block is fixed on the top of the workbench, and an inner shaft is rotatably connected to the ear block. The inner shaft and the main shaft are respectively provided with a second gear and a third gear that mesh with each other. The second gear is connected to the inner shaft through a one-way bearing, and the third gear is fixedly connected to the main shaft. A replaceable reel with welding wire is installed on the inner shaft.

[0014] Preferably, a stopper is provided on the inner shaft, and the end of the inner shaft is threadedly connected with a threaded sleeve for tightening the reel.

[0015] Compared with the prior art, the present invention provides a welding device for a hydraulic cylinder, which has the following beneficial effects: The invention relates to a welding device for a hydraulic cylinder, wherein a pressure plate is provided, and the outer shell of the cylinder body is clamped and fixed by a three-jaw chuck, and then the base is inserted into the connecting end of the outer shell, and then the vertical rod and the mounting frame are driven to move to the left as a whole by a transverse movement mechanism, and the connecting sleeve on the base gradually spreads the two pressure plates, and under the action of elastic force, the pressure plate presses the base against the outer shell. When welding, the main motor is started, and the output shaft of the main motor drives the three-jaw chuck and the outer shell to rotate, and then the outer shell drives the base, the pressure plate and the mounting frame to rotate together. Due to the pressing effect of the pressure plate, the outer shell and the base can be stably rotated synchronously, thereby improving the welding quality. Even if the angle at which the base is inserted into the outer shell is inclined, when the arc surface of the end of the connecting sleeve and the pressure plate 5 are gradually pressed, the base can be actively corrected through the interaction of forces between the pressure plate 5 and the connecting sleeve, and the base will slowly rotate in the outer shell to adjust the angle, and finally the outer arc surface of the connecting seat is in contact with both the pressure plates 5 or the outer edge of the connecting seat is in contact with both the pressure plates 5.

[0016] A welding device for a hydraulic cylinder is provided, which limits the base from both sides by setting limit blocks. When the base rotates, the limit blocks 12 can be used to keep the base stable and prevent it from deviating, thereby avoiding the situation where the pressure plate 5 is stretched open at the moment of rotation.

[0017] 3. A welding device for a hydraulic cylinder, which is provided with a spring. When the pressure plate is pushed by the connecting sleeve, the pressure plate rotates inward, and then the slider is pushed to move along the slide groove through the connecting rod. The slider gradually squeezes the spring, and then under the reverse elastic force of the spring, the pressure plate presses the base against the outer shell.

[0018] 4. A welding device for a hydraulic cylinder, by setting an insertion rod, in the process of pressing the base and the shell together, the insertion rod is first inserted into the slot, so that the mounting frame can be prevented from rotating around the shaft, so that the process of pressing the base is faster, which also provides more guidance for the staff on what angle to use when inserting the base.

[0019] 5. A welding device for a hydraulic cylinder, which provides a feed roller, passes one end of the welding wire through two feed rollers, and then inserts the end of the welding wire from the top of the welding head until the welding wire is fed into the welding nozzle of the welding head. When welding, the output shaft of the auxiliary motor drives a feed roller to start rotating, and the feed roller transports the welding wire through friction, thereby ensuring continuous feeding of the welding wire.

[0020] 6. A welding device for a hydraulic cylinder, by setting an inner shaft, when the hand wheel is turned to move the slide to the left, the main shaft synchronously drives the third gear to rotate, and the third gear engages to drive the second gear to rotate. At this time, the one-way bearing is in a locked state, and the second gear synchronously drives the inner shaft and the reel to rotate to unwind the welding wire. When the hand wheel is rotated in the opposite direction to reset the slide, the one-way bearing is in a free state, and the reel does not rotate, thereby facilitating the feeding of welding wire during subsequent welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of a welding device for a hydraulic cylinder proposed by the present invention; Figure 2 A schematic structural diagram of a transverse movement mechanism of a welding device for a hydraulic cylinder proposed by the present invention; Figure 3 A schematic diagram of a pressure plate installation structure of a welding device for a hydraulic cylinder proposed by the present invention; Figure 4 For the present invention Figure 2 A schematic diagram of the enlarged structure of a proposed welding device for a hydraulic cylinder at position A; Figure 5 For the present invention Figure 1 A schematic diagram of the enlarged structure of a welding device for a hydraulic cylinder proposed at position B; Figure 6 For the present invention Figure 1 A schematic diagram of the enlarged structure of a welding device for a hydraulic cylinder proposed at position C; Figure 7 A structural schematic diagram of a lifting mechanism of a welding device for a hydraulic cylinder proposed by the present invention; Figure 8 For the present invention Figure 7 A schematic diagram of the enlarged structure of a proposed welding device for a hydraulic cylinder at position D; Fig. 9 A schematic diagram of the split structure between a drum and an inner shaft of a welding device for a hydraulic cylinder proposed by the present invention; Fig.10 This is a schematic diagram of the first state after the base is tightened in the present invention; Fig.11 This is a schematic diagram of the second state after the base is tightened in the present invention.

[0022] In the figure: 1, workbench; 2, vertical rod; 3, rotating shaft; 4, mounting frame; 5, pressure plate; 6, slide groove; 7, slider; 8, connecting rod; 9, spring; 10, motor seat; 11, three-jaw chuck; 12, limit block; 13, horizontal plate; 14, horizontal groove; 15, moving block; 16, first screw; 17, slot; 18, plug rod; 19, slide rail; 20, slide seat; 21, notch; 22, fixed seat; 23, main shaft; 24, hand wheel; 25, first gear; 26, rack; 27, vertical plate; 28, vertical groove; 29, slide rod; 30, second screw; 31, welding head; 32, frame plate; 33, auxiliary motor; 34, feed roller; 35, ear block; 36, inner shaft; 37, reel; 38, second gear; 39, third gear; 40, stop section; 41, screw sleeve. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] Example Reference Figure 1-11A welding device for a hydraulic cylinder comprises a workbench 1, on which a motor seat 10 is fixed, and the output shaft of the main motor in the motor seat 10 is connected to a three-jaw chuck 11, and a vertical rod 2 is arranged above the workbench 1, and a side of the vertical rod 2 close to the motor seat 10 is connected to a U-shaped mounting frame 4 through a rotating shaft 3, and both ends of the mounting frame 4 are rotatably connected to a pressing plate 5, and the pressing plate 5 is elastically connected to the mounting frame 4, and the vertical rod 2 is connected to the workbench 1 through a transverse movement mechanism, and the outer shell of the cylinder body is clamped and fixed by the three-jaw chuck 11, and then the base is inserted into the connecting end of the outer shell, and then the vertical rod 2 and the mounting frame 4 are driven to move to the left as a whole through the transverse movement mechanism, and the connecting sleeve on the base gradually opens the two pressing plates 5, Under the action of elastic force, the pressure plate 5 presses the base against the shell. When welding, the main motor is started, and the output shaft of the main motor drives the three-jaw chuck 11 and the shell to rotate, and then the shell drives the base, the pressure plate 5 and the mounting frame 4 to rotate together. Due to the pressing effect of the pressure plate 5, the shell and the base can rotate stably and synchronously, thereby improving the welding quality. Even if the angle at which the base is inserted into the shell is inclined, when the arc surface of the end of the connecting sleeve and the pressure plate 5 are gradually pressed against each other, the base can be actively corrected through the interaction of the forces between the pressure plate 5 and the connecting sleeve. The base will slowly rotate in the shell to adjust the angle, and finally the outer arc surface of the connecting seat will contact with both pressure plates 5 (such as Fig.11 ) or the outer edge of the connecting seat is in contact with both pressure plates 5 (such as Fig.10 ).

[0026] Furthermore, the top and bottom inner walls of the mounting frame 4 are provided with a slide groove 6, and a slider 7 is slidably connected in the slide groove 6. A spring 9 is fixed to one end of the slider 7, and the other end of the spring 9 is fixed to the inner wall of the slide groove 6. The top of the slider 7 is rotatably connected to a connecting rod 8, and the other end of the connecting rod 8 is rotatably connected to the pressure plate 5. When the pressure plate 5 is pushed by the connecting sleeve, the pressure plate 5 rotates inward, and then the slider 7 is pushed to move along the slide groove 6 through the connecting rod 8. The slider 7 gradually squeezes the spring 9, and then under the reverse elastic force of the spring 9, the pressure plate 5 presses the base against the outer shell.

[0027] Taking into account that the base and the pressure plate 5 are elastically pressed together, when the base just rotates, it will form a relative rotation with the pressure plate 5, and the pressure plate 5 will continue to be stretched to a certain angle, which may cause the base to form an instantaneous relative rotation with the shell. In order to eliminate this effect, further, a pair of limit blocks 12 are fixed to the side where the pressure plate 5 contacts the connecting sleeve, which are used to limit the base from both sides. When the base rotates, the limit blocks 12 can be used to maintain the stability of the base to prevent it from running off, thereby avoiding the pressure plate 5 from being stretched at the moment of rotation.

[0028] Furthermore, the transverse movement mechanism includes a transverse plate 13 fixed on the top of the workbench 1, and a transverse groove 14 is opened on the transverse plate 13. A moving block 15 fixed to the vertical rod 2 is slidably connected in the transverse groove 14, and a first screw rod 16 threadedly connected to the moving block 15 is rotatably connected in the transverse groove 14. The first screw rod 16 is rotated to make the moving block 15 move to the left along the transverse groove 14, and the moving block 15 can synchronously drive the vertical rod 2 to move to the left.

[0029] Furthermore, a slot 17 is provided on the back of the mounting frame 4, and an insertion rod 18 is inserted on the vertical rod 2, the end of which can be inserted into the slot 17. In the process of pressing the base and the shell together, the insertion rod 18 is first inserted into the slot 17, so that the mounting frame 4 can be prevented from rotating around the rotating shaft 3, so that the process of pressing the base can be faster, which also provides more guidance for the staff on what angle to use when inserting the base.

[0030] Furthermore, a slide rail 19 is fixed on the top of the workbench 1, and a slide seat 20 is arranged on the slide rail 19. The slide seat 20 forms a sliding connection with the slide rail 19 through a groove 21. The slide seat 20 is connected to the welding head 31 through a lifting mechanism. A fixed seat 22 is fixed on the top of the workbench 1, and a main shaft 23 is rotatably connected to the fixed seat 22. A hand wheel 24 and a first gear 25 are respectively fixed at both ends of the main shaft 23. The first gear 25 is meshed and connected with a rack 26 on the slide seat 20. The main shaft 23 is rotated by the hand wheel 24, and the main shaft 23 synchronously drives the first gear 25 to rotate. The meshing of the first gear 25 drives the rack 26 and the slide seat 20 to move to the left along the slide rail 19, so as to move the welding head 31 to the welding position.

[0031] Furthermore, the lifting mechanism includes a vertical plate 27 fixed on the slide 20, a vertical groove 28 is opened on the vertical plate 27, a slide rod 29 is slidably connected in the vertical groove 28, a welding head 31 is fixed on the slide rod 29, a second screw rod 30 is rotatably connected in the vertical groove 28 to form a threaded connection with the slide rod 29, and the second screw rod 30 is rotated to drive the slide rod 29 to move downward along the vertical groove 28 so that the welding head 31 is close to the welding position.

[0032] Furthermore, a frame plate 32 is fixed to the side of the slide bar 29, an auxiliary motor 33 is fixed to one side of the frame plate 32, and a pair of feed rollers 34 are rotatably connected to the other side, wherein the end of one of the feed rollers 34 is connected to the output shaft of the auxiliary motor 33, one end of the welding wire is passed through the two feed rollers 34, and then the end of the welding wire is inserted from the top of the welding head 31 until the welding wire is fed into the welding nozzle of the welding head 31. When welding, the output shaft of the auxiliary motor 33 drives a feed roller 34 to start rotating, and the feed roller 34 transports the welding wire by friction, thereby ensuring the continuous feeding of the welding wire.

[0033] Furthermore, an ear block 35 is fixed on the top of the workbench 1, and an inner shaft 36 is rotatably connected to the ear block 35. A second gear 38 and a third gear 39 that mesh with each other are respectively sleeved on the inner shaft 36 and the main shaft 23. The second gear 38 is connected to the inner shaft 36 through a one-way bearing, and the third gear 39 is fixedly connected to the main shaft 23. A replaceable reel 37 with welding wire is installed on the inner shaft 36. When the hand wheel 24 is rotated to move the slide 20 to the left, the main shaft 23 synchronously drives the third gear 39 to rotate, and the third gear 39 meshes to drive the second gear 38 to rotate. At this time, the one-way bearing is in a locked state, and the second gear 38 synchronously drives the inner shaft 36 and the reel 37 to rotate to unwind the welding wire. When the hand wheel 24 is rotated in the opposite direction to reset the slide 20, the one-way bearing is in a free state, and the reel 37 does not rotate, thereby facilitating the feeding of welding wire during subsequent welding.

[0034] Furthermore, a stop section 40 is provided on the inner shaft 36, and the end of the inner shaft 36 is threadedly connected with a screw sleeve 41 for tightening the reel 37. When the welding wire is used up, the reel 37 can be directly taken out from the inner shaft 36, and then a new reel 37 can be replaced, and the screw sleeve 41 can be tightened onto the inner shaft 36, so that the reel 37 can be fixed, which is convenient for disassembly and assembly.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A welding device for a hydraulic cylinder, comprising a workbench (1), a motor seat (10) being fixed on the workbench (1), an output shaft of a main motor in the motor seat (10) being connected to a three-jaw chuck (11), characterized in that: A vertical rod (2) is arranged above the workbench (1). A side of the vertical rod (2) close to the motor seat (10) is connected to a U-shaped mounting frame (4) via a rotating shaft (3). Both ends of the mounting frame (4) are rotatably connected to pressure plates (5). The pressure plates (5) are elastically connected to the mounting frame (4). The vertical rod (2) is connected to the workbench (1) via a transverse movement mechanism. The outer shell of the cylinder body is clamped and fixed by a three-jaw chuck (11), and then the base is inserted into the connecting end of the outer shell. Then, the vertical rod (2) and the mounting frame (4) are driven to move to the left as a whole by the transverse movement mechanism. The connecting sleeve on the base gradually spreads the two pressure plates (5). Under the action of elastic force, the pressure plate (5) presses the base against the outer shell, so that the outer shell and the base can rotate stably and synchronously.

2. A welding device for a hydraulic cylinder according to claim 1, characterized in that: The top and bottom inner walls of the mounting frame (4) are both provided with a slide groove (6), a slider (7) is slidably connected in the slide groove (6), a spring (9) is fixed to one end of the slider (7), the other end of the spring (9) is fixed to the inner wall of the slide groove (6), a connecting rod (8) is rotatably connected to the top of the slider (7), and the other end of the connecting rod (8) is rotatably connected to the pressure plate (5).

3. A welding device for a hydraulic cylinder according to claim 1, characterized in that: A pair of limit blocks (12) are fixed to the side of the pressing plate (5) that contacts the connecting sleeve, and are used to limit the base from both sides.

4. A welding device for a hydraulic cylinder according to claim 1, characterized in that: The transverse movement mechanism comprises a transverse plate (13) fixed to the top of the workbench (1), a transverse groove (14) being provided on the transverse plate (13), a moving block (15) fixed to the vertical rod (2) being slidably connected in the transverse groove (14), and a first screw rod (16) being rotatably connected in the transverse groove (14) and being threadedly connected to the moving block (15).

5. A welding device for a hydraulic cylinder according to claim 3, characterized in that: A slot (17) is provided on the back of the mounting frame (4), and an insertion rod (18) is inserted on the vertical rod (2), the end of which can be inserted into the slot (17).

6. A welding device for a hydraulic cylinder according to claim 1, characterized in that: A slide rail (19) is fixed on the top of the workbench (1), a slide seat (20) is arranged on the slide rail (19), the slide seat (20) is slidably connected to the slide rail (19) through a notch (21), the slide seat (20) is connected to a welding head (31) through a lifting mechanism, a fixed seat (22) is fixed on the top of the workbench (1), a main shaft (23) is rotatably connected to the fixed seat (22), a hand wheel (24) and a first gear (25) are respectively fixed at both ends of the main shaft (23), and the first gear (25) is meshingly connected to a rack (26) on the slide seat (20).

7. A welding device for a hydraulic cylinder according to claim 6, characterized in that: The lifting mechanism comprises a vertical plate (27) fixed on the slide seat (20), a vertical groove (28) is formed on the vertical plate (27), a slide rod (29) is slidably connected in the vertical groove (28), a welding head (31) is fixed on the slide rod (29), and a second screw rod (30) is rotatably connected in the vertical groove (28) and is threadedly connected to the slide rod (29).

8. A welding device for a hydraulic cylinder according to claim 7, characterized in that: A frame plate (32) is fixed to the side of the slide bar (29), an auxiliary motor (33) is fixed to one side of the frame plate (32), and a pair of feed rollers (34) are rotatably connected to the other side, wherein the end of one of the feed rollers (34) is connected to the output shaft of the auxiliary motor (33).

9. A welding device for a hydraulic cylinder according to claim 8, characterized in that: An ear block (35) is fixed on the top of the workbench (1), and an inner shaft (36) is rotatably connected to the ear block (35). A second gear (38) and a third gear (39) meshing with each other are respectively sleeved on the inner shaft (36) and the main shaft (23). The second gear (38) is connected to the inner shaft (36) via a one-way bearing, and the third gear (39) is fixedly connected to the main shaft (23). A replaceable reel (37) with a welding wire is mounted on the inner shaft (36).

10. A welding device for a hydraulic cylinder according to claim 9, characterized in that: The inner shaft (36) is provided with a stopper (40), and the end of the inner shaft (36) is threadedly connected with a screw sleeve (41) for tightening the winding drum (37).

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