Welding device for overhauling top beam of hydraulic support

Abstract

The invention discloses a welding device for hydraulic support top beam overhauling, and relates to the technical field of hydraulic support overhauling, the welding device comprises a welding machine main cabinet, a ground wire clamp and a handheld welding machine, the ground wire clamp and the handheld welding machine are connected with the welding machine main cabinet through connecting wires, and a supporting structure is arranged at a middle handle of the handheld welding machine; the supporting structure comprises a first protective transparent cover; the handheld welding machine can be kept in a fixed posture through a three-point positioning method, so that the welding effect of the handheld welding machine is better, the handheld welding machine is prevented from shaking when held by hand, operation is more stable, the consistency of the welding depth of a welding seam of a top beam is ensured, and the hands of workers are prevented from being injured; the positions of the first protective transparent cover and the second protective transparent cover can be determined, the second protective transparent cover is held by a hand to be fixed to the first protective transparent cover, and the included angle between the welding machine held by the hand of a worker and the plane where the top beam is located is not affected.

Description

Technical Field

[0001] This invention relates to the field of hydraulic support maintenance technology, specifically a welding device for the maintenance of the top beam of a hydraulic support. Background Technology

[0002] The top beam is the core load-bearing component of the hydraulic support, directly bearing the pressure of the roof and transmitting it to the main body of the support. If the top beam has problems such as cracks or weld failures, it may lead to roof instability, causing roof collapse, roof fall, and other major safety accidents, seriously threatening the lives of underground personnel. The maintenance of the hydraulic support top beam is the key to ensuring the safe operation of the equipment, extending its service life, and improving production efficiency. Its core necessity is reflected in three dimensions: safety, production, and cost. The core of the welding maintenance of the hydraulic support top beam is to check for welding defects and repair damaged welds. A well-welded top beam ensures the load-bearing strength and structural integrity of the top beam. In the existing technology, due to the limitations of the working environment and space, there are certain drawbacks to welding the top beam of the hydraulic support during maintenance using a handheld welding machine. Handheld operation makes it difficult to accurately control the angle of the welding torch, which can easily cause changes in the angle of the handheld welding machine. Shaking during operation can lead to insufficient or uneven penetration depth. When the top beam is being welded, it can easily result in inconsistent weld depth. Holding the welding torch for a long time requires maintaining a stable posture, and the limited space in the underground working area further exacerbates the instability of the operation. Summary of the Invention

[0003] The purpose of this invention is to provide a welding device for the maintenance of the top beam of a hydraulic support, so as to solve the problems mentioned in the background art.

[0004] The objective of this invention can be achieved through the following technical solutions: A welding device for overhauling the top beam of a hydraulic support includes a welding machine main cabinet, a grounding clamp, and a handheld welding machine. Both the grounding clamp and the handheld welding machine are connected to the welding machine main cabinet via connecting cables. A support structure is provided at the middle handle of the handheld welding machine. The support structure includes a first protective transparent cover welded to the middle handle of the handheld welding machine. A center pin is welded to the surface of the first protective transparent cover. Two intersecting first telescopic outer rods are fitted around the center pin. A ring of first fixing pins is welded to the surface of the first protective transparent cover outside the center pin. First telescopic inner rods are provided inside each of the two first telescopic outer rods. Universal wheels are welded to the ends of each of the two first telescopic inner rods. Fixing bolts are threaded onto the exterior of the first telescopic outer rods. A row of fixing holes is formed inside the first telescopic inner rods at positions corresponding to the fixing bolts. The fixing bolts are used to fix the first telescopic outer rods and the first telescopic inner rods together. The end of the handheld welding machine and the two universal wheels are used to determine a specific angle of the handheld welding machine on the plane of the hydraulic support top beam.

[0005] As a preferred embodiment of the present invention, the distance between each of the first fixing pins and the center pin is the same. The ends and the middle of the first telescopic outer rod are installed on the center pin and the first fixing pin. The fixing holes are arranged at equal intervals inside the first telescopic inner rod, and the fixing bolt is fixed to one of the fixing holes.

[0006] As a preferred embodiment of the present invention, a locking structure is installed at the middle handle of the handheld welding machine and on the surface of the first protective transparent cover. The locking structure includes a second protective transparent cover, which is sleeved on the middle handle of the handheld welding machine. The first and second protective transparent covers are movably connected. A ring of locking holes is provided on the mating surfaces of the first and second protective transparent covers. The locking holes of the first protective transparent cover engage with the second protective transparent cover. A fixing ring is welded to the surface of the second protective transparent cover. A locking groove is formed inside the fixing ring. Two reserved grooves are formed at the middle handle of the handheld welding machine, corresponding to the fixing ring. A telescopic spring and a limiting block are installed inside each of the reserved grooves. The end of the limiting block is adapted to the inside of the locking groove. The limiting block and the locking groove are used to limit the relative position of the first and second protective transparent covers.

[0007] As a preferred embodiment of the present invention, a ring of clamping posts is provided on the surface of the second protective transparent cover at the location corresponding to the clamping hole. The clamping posts and clamping holes are arranged in a ring array. The clamping posts of the second protective transparent cover correspond one-to-one with the clamping holes of the first protective transparent cover. Each clamping groove is arranged in a ring array. A limit ring is installed on the outside of the handle of the handheld welding machine on one side of the fixed ring. The limit ring is used to limit the fixed ring to be located between the second protective transparent cover and the limit ring.

[0008] As a preferred technical solution of the present invention, the straight line where the two reserved slots are located is perpendicular to the axis of the fixed ring, the telescopic spring and the limiting block move along the radial direction of the fixed ring, the limiting block engages or separates from the inside of the clamping slot, and the limiting block is integrally manufactured with a pressing block on the outside, and the two pressing blocks are located outside the two limiting blocks.

[0009] As a preferred embodiment of the present invention, when the limiting block is separated from the inside of the clamping groove, the end positions of the two limiting blocks are located inside the inner diameter of the fixing ring, and the end positions of the two limiting blocks are located outside the handle of the handheld welding machine.

[0010] As a preferred embodiment of the present invention, when the limiting block engages with the inside of the clamping groove, the ends of the two limiting blocks are located outside the inner diameter of the clamping groove.

[0011] As a preferred embodiment of the present invention, a suspension assembly is provided between the fixed ring and the second protective transparent cover. The suspension assembly includes a rotating sleeve, which is fitted outside the fixed ring. A second telescopic outer rod is connected to the end of the rotating sleeve. A second telescopic inner rod is slidably connected inside the second telescopic outer rod. A connecting ball is installed at the end of the second telescopic inner rod. The connecting ball is connected to the fixed rod. A clamping block is installed at the end of the fixed rod. The clamping block is used to move the handheld welding machine after suspending it.

[0012] In a preferred embodiment of the present invention, the second telescopic outer rod is connected to the rotating sleeve via a second fixed pin. The interior of the second telescopic outer rod is fitted with the second telescopic inner rod. Under the action of external force, the second telescopic outer rod and the second telescopic inner rod move relative to each other. The connecting ball is composed of an inner ball and two ball shells welded together. The inner ball is spherically connected to the ball shells, and the inner ball is fitted with the ball shells. Under the action of external force, the inner ball and the ball shells move relative to each other.

[0013] As a preferred embodiment of the present invention, the surface of the clamping block is equipped with a movable clamping block and a fixed clamping block. The fixed clamping block is welded to the clamping block, and the movable clamping block slides relative to the interior of the clamping block. The interior of the clamping block is threaded with a horizontally arranged threaded rod, which is threaded to the bottom end of the movable clamping block. The threaded rod is used to adjust the distance between the movable clamping block and the fixed clamping block. The movable clamping block and the fixed clamping block are installed on the fixed surface to suspend the handheld welding machine.

[0014] Compared with the prior art, the beneficial effects of the present invention are: Equipped with a support structure, the position of the two casters is adjusted so that the two casters are on the same plane as the end of the handheld welding machine. The three-point positioning method can keep the handheld welding machine in a fixed position, thereby improving the welding effect of the handheld welding machine, avoiding shaking when the handheld welding machine is held, making the operation more stable, and ensuring the consistency of the welding depth of the top beam weld.

[0015] The first telescopic outer rod and the first telescopic inner rod work together to adjust the position of the caster wheel, thereby adjusting the angle between the handheld welding machine and the plane of the top beam. Equipped with a locking structure, the first and second protective transparent covers can protect the workers' hands and prevent them from being injured. The positions of the first and second protective transparent covers can be determined by the interlocking of the limiting block and the locking groove. The first and second protective transparent covers are connected by a locking hole. The second protective transparent cover is fixed to the first protective transparent cover, and the angle between the worker's hand holding the welding machine and the plane of the top beam will not be affected. The device is equipped with a suspension assembly. The second telescopic outer rod and the second telescopic inner rod are stretched, and the inner ball of the connecting ball rotates relative to the ball shell, thereby allowing the suspension position of the handheld welding machine to be adjusted. The handheld welding machine is then fixed to the fixed surface above the top beam by a clamping block. Attached Figure Description

[0016] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a structural diagram of the main body of the present invention; Figure 2 This is a schematic diagram of the handheld welding machine of the present invention; Figure 3 This is a schematic diagram of the support structure of the present invention; Figure 4 This is a schematic diagram of the universal wheel of the present invention; Figure 5 This is a schematic diagram of the fixing bolts and fixing holes of the present invention; Figure 6 This is a schematic diagram of the clamping structure of the present invention; Figure 7 This is a schematic diagram of the retaining ring and clamping groove of the present invention; Figure 8 This is a schematic diagram of the locking groove and limiting block of the present invention; Figure 9 This is a schematic diagram of the suspension assembly of the present invention; Figure 10 This is a schematic diagram of the connecting ball of the present invention; Figure 11 This is a schematic diagram of the clamping block of the present invention.

[0018] In the diagram: 1. Welding machine main cabinet; 2. Grounding clamp; 3. Handheld welding machine; 4. Support structure; 5. Clamping structure; 6. Suspension assembly; 41. First protective transparent cover; 42. First telescopic outer rod; 43. Center pin; 44. First fixing pin; 45. Caster wheel; 46. Fixing bolt; 47. First telescopic inner rod; 48. Fixing hole; 51. Second protective transparent cover; 52. Fixing ring; 53. Limiting ring; 54. Clamping groove; 55. Limiting block; 56. Pressing block; 57. Telescopic spring; 58. Reserved groove; 59. Clamping hole; 61. Rotating sleeve; 62. Second fixing pin; 63. Second telescopic outer rod; 64. Second telescopic inner rod; 65. Connecting ball; 66. Fixing rod; 67. Clamping block; 68. Threaded rod; 69. Movable clamping block; 610. Fixed clamping block. Detailed Implementation

[0019] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. 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.

[0020] Example 1:

[0021] Please see Figure 1 - Figure 5 As shown, a welding device for overhauling the top beam of a hydraulic support includes a welding machine main cabinet 1, a grounding clamp 2, and a handheld welding machine 3. Both the grounding clamp 2 and the handheld welding machine 3 are connected to the welding machine main cabinet 1 via connecting cables. When welding the top beam of the hydraulic support, the welding machine main cabinet 1 can be placed near the top beam, and the metal components are grounded through the grounding clamp 2. The handheld welding machine 3 is then used to weld the top beam of the hydraulic support. A support structure 4 is provided at the middle handle of the handheld welding machine 3. The support structure 4 includes a first protective transparent cover 41, which is welded to the handheld welding machine 3. At the center handle, a central pin 43 is welded to the surface of the first protective transparent cover 41. Two intersecting first telescopic outer rods 42 are sleeved on the outside of the central pin 43. A first fixing pin 44 is welded to the surface of the first protective transparent cover 41 outside the central pin 43. The first telescopic outer rods 42 can be inserted into the center pin 43, so that the two first telescopic outer rods 42 can rotate relative to the center pin 43. The ends of the two first telescopic outer rods 42 can be installed at the first fixing pin 44, so that the two first telescopic outer rods 42 can be arranged in an alternating manner. Each of the two first telescopic outer rods 42 has a first telescopic inner rod 47 inside. The ends of both first telescopic inner rods 47 are welded with casters 45. The outer threads of the first telescopic outer rods 42 are connected to fixing bolts 46. A row of fixing holes 48 is formed inside the first telescopic inner rods 47 at positions corresponding to the fixing bolts 46. The fixing bolts 46 are used to fix the first telescopic outer rods 42 and the first telescopic inner rods 47 together. The end of the handheld welding machine 3 and the two casters 45 are used to determine a specific angle of the handheld welding machine 3 on the plane of the hydraulic support top beam, allowing the first telescopic outer rods 42 to be extended. The inner retractable rod 47 moves along the inside of the first telescopic outer rod 42. The two universal wheels 45 are adjusted so that the end of the handheld welding machine 3 and the two universal wheels 45 are on the same plane. The first telescopic outer rod 42 and the first telescopic inner rod 47 are fixed by the fixing bolts 46. After the first telescopic outer rod 42 and the first telescopic inner rod 47 are fixed, the handheld welding machine 3 and the two universal wheels 45 can be moved along the weld seam on the top beam. The three-point positioning method can keep the handheld welding machine 3 in a fixed posture, so that the welding effect of the handheld welding machine 3 is better and the shaking of the handheld welding machine 3 is reduced when it is held.

[0022] Please see Figure 3 - Figure 5 As shown, the distance between each of the first fixing pins 44 and the center pin 43 is the same. The end and middle of the first telescopic outer rod 42 are installed on the center pin 43 and the first fixing pins 44. The fixing holes 48 are arranged equidistantly inside the first telescopic inner rod 47. The fixing bolt 46 is fixed to one of the fixing holes 48. The two first telescopic outer rods 42 can rotate around the center pin 43 and adjust the end of the first telescopic outer rod 42 to cooperate with the two first fixing pins 44. The fixing bolt 46 is inserted into the appropriate fixing hole 48, thereby adjusting the position of the two universal wheels 45 to ensure that the end of the handheld welding machine 3 and the plane where the two universal wheels 45 are located are adapted to the surface of the top beam.

[0023] Please see Figure 2 , Figure 6 - Figure 8 As shown, a clamping structure 5 is installed at the middle handle of the handheld welding machine 3, located on the surface of the first protective transparent cover 41. The clamping structure 5 includes a second protective transparent cover 51, which is fitted onto the middle handle of the handheld welding machine 3. The first protective transparent cover 41 and the second protective transparent cover 51 are movably connected. A ring of clamping holes 59 is provided on the mating surfaces of the first protective transparent cover 41 and the second protective transparent cover 51. The clamping holes 59 of the first protective transparent cover 41 engage with the second protective transparent cover 51, allowing the second protective transparent cover 51 to rotate relative to the first protective transparent cover 41. The first protective transparent cover 41 and the second protective transparent cover 51 can protect the worker's hands. A fixing ring 52 is welded to the surface of the second protective transparent cover 51, and a [missing information - likely a design feature] is opened inside the fixing ring 52. The handheld welding machine 3 has two pre-drilled slots 58 at the center handle, corresponding to the fixed ring 52. Each pre-drilled slot 58 is equipped with a telescopic spring 57 and a limiting block 55. The end of the limiting block 55 is adapted to the inside of the clamping slot 54. The limiting block 55 and the clamping slot 54 are used to limit the relative position of the first protective transparent cover 41 and the second protective transparent cover 51. After the second protective transparent cover 51 rotates, it is clamped by the limiting block 55 inside the fixed ring 52. The telescopic spring 57 pushes the limiting block 55 so that the limiting block 55 engages with the clamping slot 54, preventing the second protective transparent cover 51 and the first protective transparent cover 41 from rotating relative to each other, and ensuring that the clamping hole 59 of the first protective transparent cover 41 and the second protective transparent cover 51 are engaged together.

[0024] Please see Figure 7 and Figure 8As shown, a ring of clamping posts is provided on the surface of the second protective transparent cover 51 at the position corresponding to the clamping hole 59. The clamping posts and clamping holes 59 are arranged in a ring array. The clamping posts of the second protective transparent cover 51 correspond one-to-one with the clamping holes 59 of the first protective transparent cover 41. The clamping holes 59 of the first protective transparent cover 41 and the clamping posts of the second protective transparent cover 51 are rotated relative to each other, so that the first protective transparent cover 41 and the second protective transparent cover 51 are engaged. Each clamping groove 54 is arranged in a ring array. A limit ring 53 is installed on the outside of the handle of the handheld welding machine 3 and on one side of the fixed ring 52. The limit ring 53 is used to limit the fixed ring 52 to be located between the second protective transparent cover 51 and the limit ring 53. The rotation of the second protective transparent cover 51 drives the fixed ring 52 to rotate, and then the end of the limit block 55 engages the clamping groove 54 of the fixed ring 52. Under the action of the telescopic spring 57, the clamping groove 54 is engaged with the limit block 55.

[0025] Please see Figure 7 and Figure 8 As shown, the straight line where the two reserved slots 58 are located is perpendicular to the axis of the fixed ring 52. The telescopic spring 57 and the limiting block 55 move radially along the fixed ring 52. The limiting block 55 moves radially so that the limiting block 55 engages or disengages from the clamping groove 54 of the fixed ring 52. The limiting block 55 engages or disengages from the inside of the clamping groove 54. The limiting block 55 has a pressing block 56 integrally manufactured on its outside. The two pressing blocks 56 are located outside the two limiting blocks 55. The operator can press the two pressing blocks 56 towards the middle to separate the limiting block 55 from the clamping groove 54. The operator can release the two pressing blocks 56 and, under the action of the telescopic spring 57, engage the limiting block 55 with the clamping groove 54 again.

[0026] Please see Figure 7 As shown, when the limiting block 55 separates from the inside of the clamping groove 54, the ends of the two limiting blocks 55 are located inside the inner diameter of the fixing ring 52, and the ends of the two limiting blocks 55 are located outside the handle of the handheld welding machine 3. The two pressing blocks 56 are pressed down. When the limiting blocks 55 are pressed down, the limiting blocks 55 can be disengaged from the clamping groove 54. At this time, the second protective transparent cover 51 and the fixing ring 52 rotate, and the position of the second protective transparent cover 51 can be adjusted to protect the hand.

[0027] Please see Figure 8 As shown, when the limiting block 55 engages with the inside of the clamping groove 54, the ends of the two limiting blocks 55 are located outside the inner diameter of the clamping groove 54. After the pressing block 56 is released, the pressing block 56 clamps the clamping groove 54 under the action of the telescopic spring 57, and the fixing ring 52 and the second protective transparent cover 51 are restricted.

[0028] Please see Figure 2 , Figure 9 - Figure 11 As shown, a suspension assembly 6 is fitted between the fixed ring 52 and the second protective transparent cover 51. The suspension assembly 6 includes a rotating sleeve 61, which is fitted outside the fixed ring 52. The inner diameter of the fixed ring 52 and the inner diameter of the rotating sleeve 61 are different, allowing the fixed ring 52 to rotate relative to the rotating sleeve 61. A second telescopic outer rod 63 is connected to the end of the rotating sleeve 61. A second telescopic inner rod 64 is slidably connected inside the second telescopic outer rod 63. The second telescopic outer rod 63 can slide relative to the second telescopic inner rod 64, allowing adjustment of the second telescopic outer rod 63 and the second... The length of the telescopic inner rod 64 is specified. A connecting ball 65 is installed at the end of the second telescopic inner rod 64. The connecting ball 65 is connected to the fixed rod 66. The connecting ball 65 can adjust the position of the second telescopic inner rod 64 and the fixed rod 66. A clamping block 67 is installed at the end of the fixed rod 66. The clamping block 67 is used to move the handheld welding machine 3 after it is suspended. The clamping block 67 can be clamped on the fixed surface above the top beam, so that the handheld welding machine 3 is suspended above the top beam by the suspension assembly 6. Under the control of the connecting ball 65, the handheld welding machine 3 can weld freely on the top beam.

[0029] Please see Figure 10 and Figure 11 As shown, the second telescopic outer rod 63 is connected to the rotating sleeve 61 via the second fixing pin 62. The interior of the second telescopic outer rod 63 is fitted with the second telescopic inner rod 64. Under the action of external force, the second telescopic outer rod 63 and the second telescopic inner rod 64 move relative to each other, thereby rotating the second telescopic outer rod 63 around the second fixing pin 62. The second fixing pin 62 is interference-fitted with the rotating sleeve 61 and the second telescopic outer rod 63. Without the action of external force, the second telescopic outer rod 63 will not change position. Under the action of external force, the second telescopic outer rod 63 can change position. The connecting ball 65 consists of an inner ball and two spherical shells welded together. The inner ball is spherically connected to the spherical shells, and the inner ball and the spherical shells are fitted with a transition fit. Under the action of external force, the inner ball and the spherical shells move relative to each other. The fixing rod 66 is welded to the inner ball. Under the action of external force, the inner ball of the fixing rod 66 rotates relative to the spherical shell of the second telescopic inner rod 64.

[0030] Please see Figure 11As shown, a movable locking block 69 and a fixed locking block 610 are mounted on the surface of the locking block 67. The fixed locking block 610 is welded to the locking block 67. The movable locking block 69 slides relative to the interior of the locking block 67, which can adjust the distance between the movable locking block 69 and the fixed locking block 610. A horizontally arranged threaded rod 68 is threadedly connected to the interior of the locking block 67. The threaded rod 68 is threadedly connected to the bottom end of the movable locking block 69. The threaded rod 68 is used to adjust the distance between the movable locking block 69 and the fixed locking block 610. The movable locking block 69 and the fixed locking block 610 are installed on the fixed surface to suspend the handheld welding machine 3. By rotating the threaded rod 68, the movable locking block 69 can move closer to or away from the fixed locking block 610, which can clamp the fixed locking block 610 and the movable locking block 69 on the fixed surface near the top beam. Thus, the handheld welding machine 3 can be suspended on the fixed surface above the top beam.

[0031] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A welding device for overhauling the top beam of a hydraulic support, comprising a welding machine main cabinet (1), a grounding clamp (2), and a handheld welding machine (3), wherein the grounding clamp (2) and the handheld welding machine (3) are both connected to the welding machine main cabinet (1) via connecting wires, characterized in that, A support structure (4) is provided at the middle handle of the handheld welding machine (3). The support structure (4) includes a first protective transparent cover (41), which is welded to the middle handle of the handheld welding machine (3). A center pin (43) is welded to the surface of the first protective transparent cover (41). Two first telescopic outer rods (42) are sleeved on the outside of the center pin (43). A first fixing pin (44) is welded to the surface of the first protective transparent cover (41) and outside the center pin (43). The inner... Each part is provided with a first telescopic inner rod (47), and the ends of the two first telescopic inner rods (47) are welded with casters (45). The external thread of the first telescopic outer rod (42) is connected with a fixing bolt (46). A row of fixing holes (48) is opened inside the first telescopic inner rod (47) at the position corresponding to the fixing bolt (46). The fixing bolt (46) is used to fix the first telescopic outer rod (42) and the first telescopic inner rod (47) together. The end of the handheld welding machine (3) and the two casters (45) are used to determine a specific angle of the handheld welding machine (3) on the plane of the hydraulic support top beam.

2. The welding device for overhauling the top beam of a hydraulic support according to claim 1, characterized in that, Each of the first fixing pins (44) is at the same distance from the center pin (43). The ends and middle of the first telescopic outer rod (42) are mounted on the center pin (43) and the first fixing pins (44). The fixing holes (48) are arranged at equal intervals inside the first telescopic inner rod (47). The fixing bolt (46) is fixed to one of the fixing holes (48).

3. The welding device for overhauling the top beam of a hydraulic support according to claim 2, characterized in that, A clamping structure (5) is installed at the middle handle of the handheld welding machine (3) and on the surface of the first protective transparent cover (41). The clamping structure (5) includes a second protective transparent cover (51), which is fitted onto the middle handle of the handheld welding machine (3). The first protective transparent cover (41) and the second protective transparent cover (51) are movably connected. A ring of clamping holes (59) is provided on the mating surfaces of the first protective transparent cover (41) and the second protective transparent cover (51). The clamping holes (59) of the first protective transparent cover (41) engage with the second protective transparent cover (51). The surface of the second protective transparent cover (51) is welded with a fixing ring (52), and a locking groove (54) is opened inside the fixing ring (52). Two reserved grooves (58) are opened at the middle handle of the handheld welding machine (3) and at the position corresponding to the fixing ring (52). A telescopic spring (57) and a limiting block (55) are installed inside each of the reserved grooves (58). The end of the limiting block (55) is adapted to the inside of the locking groove (54). The limiting block (55) and the locking groove (54) are used to limit the relative position of the first protective transparent cover (41) and the second protective transparent cover (51).

4. The welding device for overhauling the top beam of a hydraulic support according to claim 3, characterized in that, A ring of clamping posts is provided on the surface of the second protective transparent cover (51) and at the position corresponding to the clamping hole (59). The clamping posts and the clamping hole (59) are arranged in a ring array. The clamping posts of the second protective transparent cover (51) correspond one-to-one with the clamping holes (59) of the first protective transparent cover (41). Each clamping groove (54) is arranged in a ring array. A limit ring (53) is installed on the outside of the handle of the handheld welding machine (3) and on the side of the fixing ring (52). The limit ring (53) is used to limit the fixing ring (52) to be located between the second protective transparent cover (51) and the limit ring (53).

5. A welding device for overhauling the top beam of a hydraulic support according to claim 4, characterized in that, The two reserved slots (58) are perpendicular to the axis of the fixed ring (52). The telescopic spring (57) and the limiting block (55) move radially along the fixed ring (52). The limiting block (55) engages or separates from the inside of the clamping groove (54). The limiting block (55) is integrally manufactured with a pressing block (56) on the outside. The two pressing blocks (56) are located outside the two limiting blocks (55).

6. A welding device for overhauling the top beam of a hydraulic support according to claim 5, characterized in that, When the limiting block (55) separates from the inside of the clamping groove (54), the end positions of the two limiting blocks (55) are located inside the inner diameter of the fixing ring (52), and the end positions of the two limiting blocks (55) are located outside the handle of the handheld welding machine (3).

7. A welding device for overhauling the top beam of a hydraulic support according to claim 5, characterized in that, When the limiting block (55) engages with the inside of the clamping groove (54), the ends of the two limiting blocks (55) are located outside the inner diameter of the clamping groove (54).

8. A welding device for overhauling the top beam of a hydraulic support according to claim 6 or 7, characterized in that, A suspension assembly (6) is fitted between the fixed ring (52) and the second protective transparent cover (51). The suspension assembly (6) includes a rotating sleeve (61), which is fitted outside the fixed ring (52). The end of the rotating sleeve (61) is connected to a second telescopic outer rod (63). The inside of the second telescopic outer rod (63) is slidably connected to a second telescopic inner rod (64). The end of the second telescopic inner rod (64) is equipped with a connecting ball (65). The inside of the connecting ball (65) is connected to the fixed rod (66). The end of the fixed rod (66) is equipped with a clamping block (67). The clamping block (67) is used to suspend the handheld welding machine (3) and then move the handheld welding machine (3).

9. A welding device for overhauling the top beam of a hydraulic support according to claim 8, characterized in that, The second telescopic outer rod (63) is connected to the rotating sleeve (61) through the second fixing pin (62). The interior of the second telescopic outer rod (63) is transitionally fitted with the second telescopic inner rod (64). Under the action of external force, the second telescopic outer rod (63) and the second telescopic inner rod (64) move relative to each other. The connecting ball (65) is composed of an inner ball and two ball shells welded together. The inner ball is spherically connected to the ball shell, and the inner ball and the ball shell are transitionally fitted. Under the action of external force, the inner ball and the ball shell move relative to each other.

10. A welding device for overhauling the top beam of a hydraulic support according to claim 9, characterized in that, The surface of the clamping block (67) is equipped with a movable clamping block (69) and a fixed clamping block (610). The fixed clamping block (610) is welded to the clamping block (67). The movable clamping block (69) slides relative to the interior of the clamping block (67). The interior of the clamping block (67) is threaded with a transversely arranged threaded rod (68). The threaded rod (68) is threaded to the bottom end of the movable clamping block (69). The threaded rod (68) is used to adjust the distance between the movable clamping block (69) and the fixed clamping block (610). The movable clamping block (69) and the fixed clamping block (610) are installed on the fixed surface to suspend the handheld welding machine (3).

Images