A special welding equipment for throat clamp

Abstract

The invention discloses a special welding device for throat clamps, which comprises: a feeding seat, a feeding frame, a turntable mechanism, a spot welding system and a steel belt conveyor frame; wherein, a plurality of shaping components are distributed circumferentially on the turntable mechanism, a feeding station is arranged at the periphery of the turntable mechanism, a feeding seat is arranged at the feeding station, a feeding frame is horizontally fixed on the feeding seat, hoop heads are arranged and conveyed on the feeding frame, and the feeding frame cooperates with the turntable mechanism to rotate and convey the hoop heads one by one to each positioning component; a steel belt conveyor frame is arranged on one side of the turntable mechanism located at the feeding station, and the steel belt conveyor frame is used to horizontally convey the steel belt to the shaping component, so that the shaping component pre-bends and shapes the outward extension edge of the hoop head, so that the hoop head is tightly held outside the steel belt; the spot welding system comprises a front spot welding component and a rear electric welding component; the invention can realize the pre-bending and shaping of the outward extension edge of the hoop head and the welding and fixing of the hoop head and the steel belt, and has high production efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of welding equipment, in particular to a special welding equipment for throat clamps. Background Art

[0002] The throat clamp, also known as the clamp or the pipe tie, is a common pipe connection fastener, which is widely used in the sealing and fixing of water pipes, gas pipes, oil pipes and other pipeline systems; in the production process of the throat clamp, the end of the steel strip in the throat clamp is mainly welded with the other hoop head. The traditional throat clamp welding production mainly adopts manual arc welding, gas shielded welding, etc., and the welding production quality is inconsistent and the efficiency is low. For example, the invention patent with patent application number CN202410536055.8 can ensure the welding center by accurately docking the hoop shell and the steel strip, and it is convenient to put in the next steel strip. Although this can significantly improve the processing efficiency, it still requires manual intervention; at the same time, the welding quality of the throat clamp is also easily affected by the size of the hoop head weld. Too large or too small a weld may lead to a decrease in firmness and insufficient strength, and the existing welding equipment is difficult to handle special weld structures, resulting in a high defective rate and high production costs.

[0003] Therefore, it is necessary to provide a special welding device for throat clamps to solve the problems raised in the above-mentioned background technology. Summary of the invention

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a special welding device for throat clamps, comprising: a feeding seat, a feeding rack, a turntable mechanism, a spot welding system and a steel belt conveyor frame; wherein, the turntable mechanism is circumferentially distributed with a plurality of shaping components, the periphery of the turntable mechanism is provided with a feeding station, the feeding seat is provided at the feeding station, the feeding rack is horizontally fixed on the feeding seat, the hoop heads are arranged and conveyed on the feeding rack, and the feeding rack cooperates with the turntable mechanism to rotate and convey the hoop heads one by one to each positioning assembly; a steel belt conveyor frame is provided on one side of the turntable mechanism located at the feeding station, and the steel belt conveyor frame is used to horizontally convey the steel belt to the shaping assembly, so that the shaping assembly pre-bends and shapes the outward extension edge of the hoop head, so that the hoop head is tightly held outside the steel belt; the spot welding system includes a front spot welding assembly and a rear electric welding assembly, and the front spot welding assembly and the rear electric welding assembly are respectively located at two adjacent stations outside the turntable mechanism, and the composition structure of the front spot welding assembly and the rear electric welding assembly is the same;

[0005] A mounting plate is horizontally fixed on the side of the steel belt conveyor frame, a front spot welding assembly is fixed on the mounting plate, and the front spot welding assembly is vertically suspended above the turntable mechanism;

[0006] The front spot welding assembly includes a frame, which is vertically fixed on the mounting plate, a guide rail frame is horizontally arranged on the frame, a connecting seat is slidably mounted on the guide rail frame, a sliding rod is vertically arranged on one side of the connecting seat, a welding transformer is slidably connected to the sliding rod, a welding arm is installed below the welding transformer, and an adjustable welding head is arranged in the welding arm;

[0007] A visual scanning unit is provided on the connecting seat, and the visual scanning unit uses a high-definition industrial camera to identify and scan the weld of the pre-bent and shaped hoop head, so as to obtain a characteristic image of the weld of the hoop head. The adjustable welding heads in the front spot welding assembly and the rear electric welding assembly adaptively adjust the spot welding parameters based on the size of the weld of each hoop head, including the spot welding contact surface, pressure and welding energy.

[0008] Further, as a preference, the shaping assembly comprises a shaping rail, which is horizontally fixed to the upper end surface of the turntable mechanism, a baffle is fixed to the end of the shaping rail on the turntable mechanism, a propulsion cylinder is symmetrically fixed to both sides of the positioning rail on the turntable mechanism, and a shaping block is installed at the telescopic end of the propulsion cylinder;

[0009] The propulsion cylinders are obliquely distributed on both sides of the positioning rail, and the two propulsion cylinders are synchronously telescopically controlled, so that the outward extension edge of the hoop head is pre-bent by the shaping block.

[0010] Further, as a preference, the adjustable welding head comprises an electrode head, which is vertically connected in the welding arm, an outer protective tube is fixed to the lower end surface of the welding arm, the lower end of the electrode head extends into and is connected in the outer protective tube, and the upper end of the electrode head is electrically connected to the welding transformer;

[0011] An inner pole ring is coaxially sleeved on the electrode head, and an outer pole ring is sleeved outside the inner pole ring; a plurality of first springs are circumferentially distributed between the electrode head and the inner pole ring, and a plurality of second springs are circumferentially distributed between the outer pole ring and the inner pole ring.

[0012] Further, as a preference, the electrode head is convexly supported by a first spring and mounted on the inner pole ring, and the inner pole ring is convexly supported by a second spring and mounted on the outer pole ring; a plurality of sliding rods are symmetrically fixed on the upper end surface of the outer pole ring, and the upper ends of the sliding rods are slidably connected in the welding arm;

[0013] The slide bar is adjusted to slide vertically so that the electrode tip contacts the weld surface preferentially;

[0014] A guide sleeve is rotatably connected in the welding arm, a plurality of guide grooves corresponding to the slide bar are provided on the side wall of the guide sleeve, a guide pin is fixed on the side wall of the slide bar, the guide pin is slidably connected in the guide groove, a driving part is provided on the welding arm, and an output end of the driving part is connected to the guide sleeve for transmission through gear meshing;

[0015] The cross section of the guide groove is an arc-shaped structure, so that the guide sleeve controls the slide bar to move up and down during forward and reverse rotation adjustment;

[0016] The electrode head is configured as a two-stage retractable structure.

[0017] Further, preferably, the spring elastic strength of the first spring is smaller than the spring elastic strength of the second spring, so that the first spring is compressed before the second spring.

[0018] Furthermore, as a preference, two electric contacts are vertically symmetrically arranged in the inner pole ring, and both of the electric contacts are slidably connected in the inner pole ring. Small teeth are rotatably connected in the inner pole ring, and internal tooth grooves are provided on the side walls of the electric contacts, and the small teeth are meshed with the internal tooth grooves for transmission; and external tooth grooves are opened on the side walls of the electrode head, and the external tooth grooves are meshed with the small teeth for transmission.

[0019] Further, preferably, when the lower end of the inner pole ring is flush with the end surface of the electrode head, the small teeth are in contact with the outer tooth grooves, and as the inner pole ring gradually protrudes outward from the electrode head under control and adjustment, the electric contact can gradually slide out of the inner pole ring under gear transmission;

[0020] The outer pole ring is provided with electrical contacts of the same structure

[0021] Further, as a preference, a sealing chamber is provided in the welding arm, a piston is slidably connected in the sealing chamber, the piston sleeve is fixed on the telescopic end of the electrode head, and an air control tube is also connected to the outside of the sealing chamber.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The special welding equipment for the throat clamp in the present invention does not require human intervention, and can pre-bend and shape the outer edge of the clamp head and weld and fix the clamp head to the steel strip through the shaping component and the spot welding system, and has high production efficiency; wherein, the spot welding system is provided with a front spot welding component and a rear spot welding component, and the front spot welding component and the rear spot welding component can adjust the spot welding parameters for special structural welds, so that the best welding method can be adopted for welding according to the pre-bending and shaping condition of the outer edge of the clamp head, thereby improving the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0025] Figure 2 It is a structural schematic diagram of the front spot welding assembly in the present invention;

[0026] Figure 3 It is a structural schematic diagram of the shaping component in the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of the adjustable welding head in the present invention;

[0028] Figure 5 for Figure 4 The enlarged schematic diagram at A in the middle;

[0029] Figure 6 It is a schematic diagram of the structure of the electric contact in the present invention;

[0030] Figure 7 It is a structural schematic diagram of the throat hoop in the present invention;

[0031] In the figure: 1. turntable mechanism; 11. feeding seat; 12. feeding frame; 13. steel belt conveyor frame; 14. mounting plate; 2. shaping assembly; 21. shaping rail; 22. baffle; 23. propulsion cylinder; 24. shaping block; 3. front spot welding assembly; 31. guide rail frame; 32. connecting seat; 33. slide bar; 34. welding transformer; 35. welding arm; 36. outer protective tube; 4. adjustable welding head; 41. pole head; 42. inner pole ring; 43. outer pole ring; 44. first spring; 45. second spring; 46. slide bar; 47. guide sleeve; 48. guide pin; 5. electrical contact; 51. small tooth; 6. sealing chamber; 61. piston. DETAILED DESCRIPTION

[0032] See also Figure 1-Figure 6 In an embodiment of the present invention, a special welding device for throat clamps includes: a feeding seat 11, a feeding rack 12, a turntable mechanism 1, a spot welding system and a steel belt conveyor 13; wherein, the turntable mechanism 1 is circumferentially distributed with a plurality of shaping components 2, the periphery of the turntable mechanism 1 is provided with a feeding station, the feeding seat 11 is provided at the feeding station, the feeding seat 11 is horizontally fixed with a feeding rack 12, the feeding rack 12 is arranged and conveyed with hoop heads, the feeding rack 12 cooperates with the turntable mechanism 1 to rotate and convey the hoop heads one by one to each positioning component 2; the turntable mechanism 1 is located at the feeding station A steel belt conveyor 13 is provided on one side, and the steel belt conveyor 13 is used to horizontally convey the steel belt to the shaping component 2, so that the shaping component 2 pre-bends the outward extension edge of the hoop head to shape it, so that the hoop head is tightly held outside the steel belt; the spot welding system includes a front spot welding component and a rear electric welding component, and the front spot welding component 3 and the rear electric welding component are respectively located at two adjacent stations outside the turntable mechanism 1, and the composition structure of the front spot welding component 3 and the rear electric welding component is the same; that is, the front spot welding component 3 and the rear electric welding component can successively perform welding processing on the hoop head on the shaping component to ensure welding quality;

[0033] A mounting plate 14 is horizontally fixed to the side of the steel belt conveyor frame 13, and a front spot welding assembly 3 is fixed on the mounting plate 14. The front spot welding assembly 3 is vertically suspended above the turntable mechanism 1;

[0034] The front spot welding assembly 3 includes a frame, which is vertically fixed on the mounting plate 14, and a guide rail frame 31 is horizontally arranged on the frame, and a connecting seat 32 is slidably installed on the guide rail frame 31, and a sliding rod 33 is vertically arranged on one side of the connecting seat 32, and a welding transformer 34 is slidably connected to the sliding rod 33, and a welding arm 35 is installed below the welding transformer 34, and an adjustable welding head 4 is arranged in the welding arm 35;

[0035] The connecting seat 32 is provided with a visual scanning unit, and the visual scanning unit uses a high-definition industrial camera to identify and scan the weld of the pre-bent and shaped hoop head, so as to obtain the characteristic image of the weld of the hoop head. The adjustable welding head 4 in the front spot welding component 3 and the rear electric welding component adaptively adjusts the spot welding parameters based on the weld size of each hoop head, including the spot welding contact surface, pressure and welding energy. On the one hand, it ensures the welding accuracy of each hoop head, optimizes the welding effect, and ensures that each welding can be carried out under the optimal conditions, thereby improving the stability of the weld and the quality consistency of the overall product. On the other hand, it can effectively avoid welding defects such as over-welding and under-welding, and reduce the defective rate and subsequent rework and repair costs.

[0036] In this embodiment, the shaping component 2 includes a shaping rail 21, which is horizontally fixed to the upper end surface of the turntable mechanism 1, and a baffle 22 is fixed to the end of the shaping rail 21 on the turntable mechanism 1, and a propulsion cylinder 23 is symmetrically fixed to both sides of the positioning rail 21 on the turntable mechanism 1, and a shaping block 24 is installed at the telescopic end of the propulsion cylinder 23;

[0037] The propulsion cylinders 23 are obliquely distributed on both sides of the positioning rail 21, and the two propulsion cylinders 23 are synchronously telescopically controlled, so that the shaping block 24 pre-bends the outward edge of the hoop head. That is to say, when the steel strip is conveyed to the shaping component through the steel strip conveyor frame, the end of the steel strip can be aligned with the hoop head, and the outward edge of the hoop head is vertically upward. At the same time, the hoop head is clamped in the positioning rail and abuts against the baffle. When the two shaping blocks are pushed by the propulsion cylinders, the shaping blocks can gradually bend the outward edge of the hoop head inward to shape it, so that the outward edge of the hoop head is tightly embraced by the steel strip.

[0038] As a preferred embodiment, the adjustable welding head 4 includes an electrode head 41, which is vertically connected to the welding arm 35, and an outer protective tube 36 is fixed to the lower end surface of the welding arm 35. The lower end of the electrode head 41 extends into and is connected to the outer protective tube 36, and the upper end of the electrode head 41 is electrically connected to the welding transformer 34; that is, the adjustable welding head uses resistance welding to spot weld the hoop head, and its working principle is mainly to use the resistance heat generated by the current passing through the contact point between the hoop head and the steel strip to melt the metal and realize the connection between the metals (which belongs to the prior art and will not be described in detail);

[0039] An inner pole ring 42 is coaxially sleeved on the electrode head 41, and an outer pole ring 43 is outermostly sleeved on the inner pole ring 42; a plurality of first springs 44 are circumferentially distributed between the electrode head 41 and the inner pole ring 42, and a plurality of second springs 45 are circumferentially distributed between the outer pole ring 43 and the inner pole ring 42.

[0040] In this embodiment, the electrode head 41 is elastically supported by the first spring 44 and protrudes from the inner pole ring 42, and the inner pole ring 42 is elastically supported by the second spring 45 and protrudes from the outer pole ring 43; a plurality of slide bars 46 are symmetrically fixed on the upper end surface of the outer pole ring 43, and the upper ends of the slide bars 46 are slidably connected in the welding arm 35;

[0041] The slide bar 46 allows the electrode head 41 to preferentially contact the weld surface during vertical sliding adjustment;

[0042] A guide sleeve 47 is rotatably connected in the welding arm 35, and a plurality of guide grooves corresponding to the slide bar 46 are formed on the side wall of the guide sleeve 47. A guide pin 48 is fixed on the side wall of the slide bar 46, and the guide pin 48 is slidably connected in the guide groove. A driving part is provided on the welding arm 35, and an output end of the driving part is connected to the guide sleeve 47 for transmission through gear meshing.

[0043] The cross section of the guide groove is an arc-shaped structure, so that the guide sleeve 47 controls the slide bar 46 to slide up and down during forward and reverse rotation adjustment;

[0044] The electrode head 41 is configured as a two-stage retractable structure. Specifically, according to the acquired hoop weld size image, the electrode head can be made to contact only the hoop head for spot welding by adjusting the slide bar vertically (the electrode head is partially extended under the drive of the slide bar), or the outer pole ring, the inner pole ring, and the electrode head can be made to contact with the hoop head for spot welding by adjusting the slide bar vertically (the electrode head is fully extended under the drive of the slide bar), so as to specifically adjust the spot welding contact surface and the spot welding pressure based on the weld specifications, so that:

[0045] 1. Improve welding adaptability and flexibly cope with welds of different specifications;

[0046] 2. Precisely matched contact surfaces and pressures can reduce defects such as welding spatter, burn-through or incomplete penetration, ensuring that each weld point can achieve the best metallurgical bonding state and improve the mechanical properties and durability of the weld;

[0047] 3. Ensure smooth current flow and even heat distribution to avoid overheating or underheating, thereby obtaining more uniform and defect-free solder joints

[0048] 4. It can adapt to the outer edge of the hoop head of different thicknesses and shapes, especially for weld specifications with large variations. Adjusting the spot welding contact surface can ensure that each welding can achieve the best effect.

[0049] In this embodiment, the spring elastic strength of the first spring 44 is smaller than the spring elastic strength of the second spring 45, so that the first spring 44 is compressed before the second spring 45, that is, when the slide bar slides down to press the middle electrode head into contact with the hoop head, the first spring is compressed first, so that the inner pole ring subsequently contacts the surface of the hoop head, and as the slide bar continues to slide, the outer pole ring, the inner pole ring and the electrode head are finally in contact with the surface of the hoop head.

[0050] In this embodiment, two electric contacts 5 are vertically symmetrically arranged in the inner pole ring 42, and the two electric contacts 5 are both slidably connected in the inner pole ring 42. A small tooth 51 is rotatably connected in the inner pole ring 42, and an inner tooth groove is provided on the side wall of the electric contact 5. The small tooth 51 is meshed with the inner tooth groove for transmission; and an outer tooth groove is opened on the side wall of the electrode head 41, and the outer tooth groove is meshed with the small tooth 51 for transmission.

[0051] As a preferred embodiment, when the lower end of the inner pole ring 42 is flush with the end surface of the electrode head 41, the small teeth 51 are in contact with the outer tooth grooves, and as the inner pole ring 42 gradually protrudes outward from the electrode head 41 under control and adjustment, the electric contact 5 can gradually slide out of the inner pole ring 42 under gear transmission;

[0052] The outer pole ring 43 is provided with an electric contact 5 of the same structure, wherein the electric contacts on the outer pole ring and the inner pole ring can contact the outer edge of the hoop head (not at the weld), thereby realizing the welding fixation of the hoop head edge and the steel strip.

[0053] In this embodiment, a sealing chamber 6 is provided in the welding arm 35, and a piston 61 is slidably connected in the sealing chamber 6. The piston 61 is sleeved and fixed on the telescopic end of the electrode head 41. The sealing chamber 6 is also connected to an air control tube. Specifically, when the slide bar slides downward to control the outer pole ring, the inner pole ring and the electrode head to protrude out of the outer protective tube, the telescopic end of the electrode head is actively retracted upward by controlling the air control tube, so that the electrode head is gradually flush with the end face of the inner pole ring. When the electrode head is retracted in the inner pole ring, the two electric contacts in the inner pole ring can be extended under the gear drive, so as to realize the welding fixation of the outer edge of the hoop head and the steel belt (the working mode of the electric contacts in the outer pole ring is the same as above);

[0054] Especially for the welding production of throat clamps with high welding difficulty, the front spot welding assembly can perform preliminary welding and fixing through the electric contacts on the inner pole ring or the outer pole ring according to the size of the outer edge of the clamp head, and then the adjustable welding head in the rear spot welding assembly can adjust the spot welding contact surface and contact pressure according to the size of the weld, thereby enhancing the versatility and flexibility of the welding process.

[0055] What is described above 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 special welding device for throat clamps, characterized in that: It includes: A feeding seat (11), a feeding rack (12), a turntable mechanism (1), a spot welding system and a steel belt conveyor frame (13); wherein the turntable mechanism (1) is provided with a plurality of shaping components (2) distributed circumferentially, a feeding station is provided on the periphery of the turntable mechanism (1), a feeding seat (11) is provided at the feeding station, a feeding rack (12) is horizontally fixed on the feeding seat (11), hoops are arranged and conveyed on the feeding rack (12), and the feeding rack (12) cooperates with the turntable mechanism (1) to rotate and convey the hoops one by one to each shaping component (2) ; A steel belt conveyor frame (13) is provided on one side of the turntable mechanism (1) located at the feeding station, and the steel belt conveyor frame (13) is used to horizontally convey the steel belt to the shaping component (2), so that the shaping component (2) pre-bends and shapes the outward extension edge of the hoop head, so that the hoop head is tightly held outside the steel belt; the spot welding system comprises a front spot welding component (3) and a rear electric welding component, and the front spot welding component (3) and the rear electric welding component are respectively located at two adjacent stations outside the turntable mechanism (1), and the composition structure of the front spot welding component (3) and the rear electric welding component are the same; A mounting plate (14) is horizontally fixed to the side of the steel belt conveyor frame (13), and a front spot welding assembly (3) is fixed on the mounting plate (14), so that the front spot welding assembly (3) is vertically suspended above the turntable mechanism (1); The front spot welding assembly (3) comprises a frame, which is vertically fixed on the mounting plate (14); a guide rail frame (31) is horizontally arranged on the frame; a connecting seat (32) is slidably mounted on the guide rail frame (31); a sliding rod (33) is vertically arranged on one side of the connecting seat (32); a welding transformer (34) is slidably connected to the sliding rod (33); a welding arm (35) is installed below the welding transformer (34); an adjustable welding head (4) is arranged in the welding arm (35); The connection seat (32) is provided with a visual scanning unit, and the visual scanning unit uses a high-definition industrial camera to identify and scan the weld of the pre-bent and shaped hoop head, thereby obtaining a characteristic image of the weld of the hoop head. The adjustable welding head (4) in the front spot welding component (3) and the rear electric welding component adaptively adjusts the spot welding parameters based on the size of the weld of each hoop head, including the spot welding contact surface, pressure and welding energy; The shaping assembly (2) comprises a shaping rail (21) horizontally fixed to the upper end surface of the turntable mechanism (1); a baffle (22) is fixed to the end of the shaping rail (21) on the turntable mechanism (1); propulsion cylinders (23) are symmetrically fixed to both sides of the shaping rail (21) on the turntable mechanism (1); and shaping blocks (24) are installed at the telescopic ends of the propulsion cylinders (23); The propulsion cylinders (23) are obliquely distributed on both sides of the shaping rail (21), and the two propulsion cylinders (23) are synchronously telescopically controlled, so that the shaping block (24) pre-bends the outward extension edge of the hoop head.

2. A special welding device for throat clamps according to claim 1, characterized in that: The adjustable welding head (4) comprises an electrode head (41) which is vertically connected inside the welding arm (35); an outer protective tube (36) is fixed to the lower end surface of the welding arm (35); the lower end of the electrode head (41) extends into and is connected to the outer protective tube (36); and the upper end of the electrode head (41) is electrically connected to the welding transformer (34); An inner pole ring (42) is coaxially sleeved on the electrode head (41), and an outer pole ring (43) is sleeved on the inner pole ring (42); a plurality of first springs (44) are circumferentially distributed between the electrode head (41) and the inner pole ring (42), and a plurality of second springs (45) are circumferentially distributed between the outer pole ring (43) and the inner pole ring (42).

3. A special welding device for throat clamps according to claim 2, characterized in that: The electrode head (41) is mounted so as to protrude from the inner pole ring (42) under the elastic support of a first spring (44), and the inner pole ring (42) is mounted so as to protrude from the outer pole ring (43) under the elastic support of a second spring (45); a plurality of sliding rods (46) are symmetrically fixed to the upper end surface of the outer pole ring (43), and the upper ends of the sliding rods (46) are slidably connected to the welding arm (35); The slide rod (46) allows the electrode head (41) to preferentially contact the weld surface during vertical sliding adjustment; A guide sleeve (47) is rotatably connected inside the welding arm (35), a plurality of guide grooves corresponding to the slide bar (46) are formed on the side wall of the guide sleeve (47), a guide pin (48) is fixed on the side wall of the slide bar (46), and the guide pin (48) is slidably connected in the guide groove; a driving part is provided on the welding arm (35), and an output end of the driving part is connected to the guide sleeve (47) for transmission through gear meshing; The cross section of the guide groove is an arc-shaped structure, so that the guide sleeve (47) controls the slide bar (46) to move up and down during forward and reverse rotation adjustment; The electrode head (41) is configured as a two-stage retractable structure.

4. A special welding device for throat clamps according to claim 2, characterized in that: The spring force strength of the first spring (44) is smaller than the spring force strength of the second spring (45), so that the first spring (44) is compressed before the second spring (45).

5. The special welding equipment for throat clamp according to claim 2, characterized in that: Two electric contacts (5) are also vertically symmetrically arranged in the inner pole ring (42), and the two electric contacts (5) are both slidably connected in the inner pole ring (42). A small tooth (51) is rotatably connected in the inner pole ring (42), and an inner tooth groove is provided on the side wall of the electric contact (5), and the small tooth (51) meshes with the inner tooth groove for transmission; and an outer tooth groove is provided on the side wall of the electrode head (41), and the outer tooth groove meshes with the small tooth (51) for transmission.

6. The special welding equipment for throat clamp according to claim 5, characterized in that: When the lower end of the inner pole ring (42) is flush with the end surface of the electrode head (41), the small teeth (51) are in contact with the outer tooth grooves, and as the inner pole ring (42) gradually protrudes outward from the electrode head (41) under control and adjustment, the electrical contact (5) can gradually slide out of the inner pole ring (42) under gear transmission; An electrical contact (5) with the same structure is provided in the outer pole ring (43).

7. A special welding device for throat clamps according to claim 6, characterized in that: A sealing chamber (6) is provided inside the welding arm (35), a piston (61) is slidably connected to the sealing chamber (6), the piston (61) is sleeved and fixed on the telescopic end of the electrode head (41), and an air control pipe is also connected to the outside of the sealing chamber (6).

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