Welding device for anchor chain production

Abstract

The invention relates to the technical field of anchor chain production, in particular to a welding device for anchor chain production, which comprises a main body unit, a bracket, an upper fixing frame fixedly connected to the top of the bracket, and a welding clamping unit, comprising a lower clamping assembly which is arranged on an upper fixing frame and used for heating, welding and side face clamping of an anchor chain, and an upper clamping assembly which is arranged above the lower clamping assembly and used for clamping the upper portion of the anchor chain. Through linkage of the inflation assembly and the upper clamping assembly, the clamping force of the lower electrode clamp increases progressively along with air pressure, the current control assembly increases current synchronously, dynamic cooperative increasing of the clamping force and the temperature is achieved, and by means of elastic cooperation of air pressure thrust and a spring and radial concession of the lower electrode clamp, thermal deformation is adapted, thermal stress is released, and defects such as air holes are reduced; by means of the trapezoid block force increasing mechanism, the clamping pressure is increased twice, molten metal flows evenly, the welding seam quality is improved, heat loss is reduced, high efficiency and low consumption are achieved, and the high-strength anchor chain production requirement is met.

Description

Technical Field

[0001] The present invention relates to the technical field of anchor chain production, and in particular to a welding device for anchor chain production. Background Art

[0002] As a core safety component of ships and marine engineering, anchor chains are mainly used to connect ships and anchors. When moored, they withstand loads such as wind and water flow on ships. The quality of their welding is directly related to the safety of ship navigation. Traditional anchor chain welding devices generally adopt a process mode of rigid clamping and constant high current heating. A rigid electrode fixture is used to apply a constant clamping force to the anchor chain at the initial stage of welding. At the same time, the electrode fixture directly passes the maximum welding current, so that the anchor chain end quickly melts and the welding is completed through the top forging pressure. However, rigid clamping and constant high current are not convenient to better match the dynamic requirements of anchor chain welding. Since the anchor chain is a ring-shaped metal The anchor chain is a metal component that will experience circumferential thermal expansion during welding. Rigid fixtures may not be able to automatically achieve the corresponding radial concession during the heating and welding process, which can easily lead to high circumferential thermal stress in the welding area and cause weld cracks in the anchor chain. Furthermore, applying the maximum clamping force directly in the initial stage may hinder the natural deformation of the anchor chain after heating. Using a constant high current heating method will cause the anchor chain temperature to rise sharply, which may cause localized uneven heating, making the molten metal relatively less fluid, and prone to defects such as pores, coarse metal grains, and lack of fusion, which will affect the strength and fatigue resistance of the anchor chain. In view of this, we propose a welding device for anchor chain production. Summary of the Invention

[0003] In response to the above-mentioned shortcomings of the prior art, the present invention provides a welding device for anchor chain production, which can effectively solve the problems of the prior art anchor chain welding device using rigid clamping and constant high current heating, which has the problems of rigid clamps being inconvenient to retreat radially, leading to thermal stress cracks, clamping force hindering deformation, and high current uneven heating, which easily causes defects such as poor fluidity of molten metal, pores, coarse grains and unfused metals, affecting the strength and fatigue resistance of the anchor chain.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: The present invention provides a welding device for anchor chain production, comprising a main unit, a bracket, and an upper fixing frame fixedly connected to the top of the bracket; The welding clamping unit includes a lower clamping assembly provided on the upper fixing frame for heating, welding and side clamping of the anchor chain, an upper clamping assembly provided above the lower clamping assembly for clamping the upper portion of the anchor chain, and an inflation assembly provided between the lower clamping assembly and the upper clamping assembly for applying pressure to the lower clamping assembly during the downward pressing process of the upper clamping assembly; The current control unit includes a current control component arranged on the bracket for providing welding current to the lower clamping component, and a transmission component arranged on the upper clamping component for gradually increasing the output current of the current control component during the downward pressing process of the upper clamping component.

[0005] Furthermore, the lower clamping assembly includes two groups of lower electrode clamps symmetrically arranged on the upper fixed frame, the tops of the two groups of lower electrode clamps are fixedly connected to trapezoidal blocks 1, and the bottoms of the two groups of lower electrode clamps are fixedly connected to sliders 1 slidably arranged inside the upper fixed frame, the sides of the two groups of sliders 1 that are close to each other are connected by buffer pad 1, and the sides of the two groups of sliders 1 that are away from each other are connected to the inner wall of the upper fixed frame through buffer pad 2.

[0006] Furthermore, springs are fixed on the sides of the two sets of sliders that are away from each other, and the ends of the springs away from the slider are fixedly connected to a fixed rod, and the ends of the fixed rods away from the springs are fixedly connected to the inside of the upper fixed frame, and the inner walls of the fixed rods are slidably connected to a movable rod, and the ends of the movable rods away from the fixed rods are fixedly connected to one side of the slider.

[0007] Furthermore, the upper clamping assembly includes a telescopic electric cylinder fixedly connected to the top of the upper fixed frame, the output end of the telescopic electric cylinder is fixedly connected to a counterweight block connected to the transmission assembly, and the bottom of the counterweight block is fixedly connected to a fixed plate.

[0008] Furthermore, the bottom of the fixed plate is fixedly connected to an upper clamping plate arranged above the two groups of lower electrode clamps, and trapezoidal blocks 2 corresponding to trapezoidal blocks 1 are arranged on both sides of the upper clamping plate, and the tops of the two groups of trapezoidal blocks 2 are fixedly connected to the bottom of the fixed plate.

[0009] Furthermore, the inflation assembly includes a piston cylinder fixedly connected to the upper fixing frame, and the bottom of the piston cylinder is connected to one end of the fixing rod through a connecting pipe.

[0010] Furthermore, a rubber piston is sleeved on the inner wall of the piston cylinder, a piston rod is fixedly connected to the top of the rubber piston, the top of the piston rod is fixedly connected to the bottom of the fixed plate, a hose is provided on the outside of the piston rod, and both ends of the hose are fixedly connected to the bottom of the fixed plate and the top of the piston cylinder respectively.

[0011] Furthermore, the current control component includes a variable resistance box fixedly connected to the top of the bracket, the output end of the variable resistance box is electrically connected to the input end of the two sets of lower electrode clamps through a wire, the input end of the variable resistance box is electrically connected to a current regulating switch fixedly connected to one side of the variable resistance box, and the current regulating switch is fixedly connected to a valve stem connected to the transmission component through an internal conductive contact.

[0012] Furthermore, the transmission assembly includes a slider 2 fixedly connected to the counterweight block, and one end of the slider 2 away from the counterweight block is fixedly connected to a rack.

[0013] Furthermore, one side of the rack is meshed with a gear rotatably arranged on the inner wall of the upper fixing frame via a rotating shaft, and one axial side of the gear is fixedly connected to an end of the valve stem away from the conductive contact inside the current regulating switch via a telescopic rod.

[0014] Compared with the known public technologies, the technical solution provided by the present invention has the following beneficial effects: The present invention links the inflation component with the upper clamping component, inflates the inner cavity of the fixed rod when the upper clamping plate descends, pushes the movable rod to squeeze the slider, so that the clamping force of the lower electrode clamp increases with the air pressure, and at the same time the current control component synchronously increases the heating current, so as to achieve a dynamic coordinated increase in the clamping force and the temperature, thereby solving the problem that the initial force of the traditional rigid clamp hinders the deformation of the anchor chain, ensuring that the anchor chain is stably fitted during the preheating stage and avoiding uneven heating. With the help of the air pressure thrust of the inflation component and the elasticity of the spring, when the anchor chain is heated and expanded, the lower electrode clamp can radially retreat to adapt to the circumferential thermal deformation, release the circumferential thermal stress of the welding zone, solve the problem of weld cracks caused by the inconvenience of radial retreat of the traditional rigid clamp, and effectively reduce defects such as pores, coarse metal grains, and unfused metals. By utilizing the wedge-shaped force-enhancing mechanism formed by the fitting of trapezoidal blocks, the clamping pressure is increased twice and kept constant during the high-temperature welding stage. Combined with high-current heating, the molten metal at the anchor chain end is squeezed and flowed evenly, which can further improve the weld density and joint strength, enhance fatigue resistance, and reduce the contact heat energy loss between the electrode fixture and the anchor chain, avoiding energy waste, achieving high efficiency, low consumption and stable quality in anchor chain welding, and meeting the production reliability requirements of high-strength anchor chains. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0016] Figure 1 This is a schematic diagram of the structure of the present invention from a first perspective; Figure 2 This is a schematic structural diagram of the welding clamping unit and current control unit of the present invention; Figure 3 This is a schematic diagram of the disassembled structure of the welding clamping unit and the current control unit of the present invention; Figure 4 Schematic diagram of the disassembled structure of the lower clamping assembly of the present invention Figure 5 This is a schematic diagram of the disassembled structure of the upper clamping assembly and the inflation assembly of the present invention; Figure 6 This is a schematic diagram of the cross-sectional structure of the piston cylinder of the present invention; Figure 7 It is a schematic structural diagram of the transmission assembly of the present invention; Figure 8 Schematic diagram of the structure of the current control component of the present invention.

[0017] The reference numerals in the figure represent: 100, main unit; 101, bracket; 102, upper fixing frame; 200, welding clamping unit; 201, lower clamping assembly; 2011, lower electrode fixture; 2012, slider 1; 2013, fixed rod; 2014, trapezoidal block 1; 2015, buffer pad 1; 2016, movable rod; 2017, spring; 2018, buffer pad 2; 202, upper clamping assembly; 2021, telescopic cylinder; 2022, counterweight; 2023, fixed plate; 2024, upper clamping plate; 2025, trapezoidal block 2; 203, inflatable assembly; 2031, piston cylinder; 2032, connecting pipe; 2033, hose; 2034, rubber piston; 2035, piston rod; 300, current control unit; 301, current control component; 3011, resistance box; 3012, current regulating switch; 3013, valve stem; 302, transmission component; 3021, slider 2; 3022, rack; 3023, gear; 3024, telescopic rod. DETAILED DESCRIPTION

[0018] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0019] The present invention will be further described below with reference to the embodiments.

[0020] A welding device for anchor chain production, comprising a main unit 100, comprising a bracket 101, and an upper fixing frame 102 fixedly connected to the top of the bracket 101; a welding clamping unit 200, comprising a lower clamping assembly 201 disposed on the upper fixing frame 102 for heating, welding and side clamping of the anchor chain; an upper clamping assembly 202 disposed above the lower clamping assembly 201 for clamping the upper portion of the anchor chain; and an inflation assembly 203 disposed between the lower clamping assembly 201 and the upper clamping assembly 202 for applying pressure to the lower clamping assembly 201 during the downward pressing of the upper clamping assembly 202; a current control unit 300, comprising a current control assembly 301 disposed on the bracket 101 for providing welding current to the lower clamping assembly 201, and a transmission assembly 302 disposed on the upper clamping assembly 202 for gradually increasing the output current of the current control assembly 301 during the downward pressing of the upper clamping assembly 202; Specifically, the lower clamping assembly 201 includes two groups of lower electrode clamps 2011 symmetrically arranged on the upper fixed frame 102, the tops of the two groups of lower electrode clamps 2011 are fixedly connected to a trapezoidal block 2014, the bottoms of the two groups of lower electrode clamps 2011 are fixedly connected to a slider 2012 slidably arranged inside the upper fixed frame 102, and the two groups of sliders 2012 are fixed with a spring 2017 on the side away from each other, and the end of the spring 2017 away from the slider 2012 is fixedly connected to a fixing rod 2013, and the end of the fixing rod 2013 away from the spring 2017 is fixedly connected to the interior of the upper fixed frame 102, The inner wall of the rod 2013 is slidably connected to a movable rod 2016, and one end of the movable rod 2016 away from the fixed rod 2013 is fixedly connected to one side of the slider 1 2012; the tops of the two sets of lower electrode clamps 2011 are each provided with an annular groove that fits with the anchor chain. Before welding, the anchor chain to be welded can be placed in the annular grooves of the two sets of lower electrode clamps 2011. The elastic effect of the spring 2017 can drive the movable rod 2016 in the fixed rod 2013 to apply pressure to the slider 1 2012, so that the two sets of lower electrode clamps 2011 can clamp and fix the anchor chain to a certain extent, ensuring the stability of the anchor chain placement; It should be noted that the sides of the two sets of sliders 2012 that are close to each other are connected by a buffer pad 1 2015, and the sides of the two sets of sliders 1 2012 that are away from each other are connected to the inner wall of the upper fixing frame 102 by a buffer pad 2018; the buffer pad 1 2015 and the buffer pad 2 2018 on the slider 1 2012 are retractable corrugated soft pads. The buffer pad 1 2015 and the buffer pad 2 2018 provided on the slider 1 2012 can prevent welding slag particles from entering the interior of the upper fixing frame 102 during the welding process, thereby preventing the normal transmission movement of related components such as the internal spring 2017 and the slider 1 2012, thereby ensuring long-term and reliable operation of the clamping structure; Specifically, the upper clamping assembly 202 includes a telescopic electric cylinder 2021 fixedly connected to the top of the upper fixed frame 102, the output end of the telescopic electric cylinder 2021 is fixedly connected to a counterweight block 2022 connected to the transmission assembly 302, the bottom of the counterweight block 2022 is fixedly connected to a fixed plate 2023, the bottom of the fixed plate 2023 is fixedly connected to an upper clamping plate 2024 arranged above the two groups of lower electrode clamps 2011, both sides of the upper clamping plate 2024 are provided with a trapezoidal block 2025 corresponding to the trapezoidal block 1 2014, and the tops of the two groups of trapezoidal blocks 2025 are fixedly connected to the bottom of the fixed plate 2023; the inflation assembly 203 includes a piston cylinder 2031 fixedly connected to the upper fixed frame 102, the bottom of the piston cylinder 2031 is connected to one end of the fixed rod 2013 through a connecting pipe 2032, and the piston cylinder The inner wall of 2031 is sleeved with a rubber piston 2034, and the top of the rubber piston 2034 is fixedly connected to a piston rod 2035, and the top of the piston rod 2035 is fixedly connected to the bottom of the fixed plate 2023; after the anchor chain is clamped stably, the telescopic electric cylinder 2021 is started. When the telescopic electric cylinder 2021 is started and drives the counterweight 2022 to descend, the piston rod 2035 at the bottom of the fixed plate 2023 is simultaneously inserted into the piston cylinder 2031, and the air in the piston cylinder 2031 is pressed into the inner cavity of the fixed rod 2013 through the connecting pipe 2032. The air pressure pushes the movable rod 2016 to squeeze the slider 1 2012, so that the clamping force of the lower electrode clamp 2011 increases as the air pressure increases, thereby ensuring a stable increase in the clamping force, so that the anchor chain always maintains a good clamping state during the preheating stage, and avoids displacement caused by insufficient clamping force; It should be noted that a hose 2033 is provided on the outside of the piston rod 2035. The two ends of the hose 2033 are fixedly connected to the bottom of the fixed plate 2023 and the top of the piston cylinder 2031 respectively. The hose 2033 is a retractable corrugated soft pipe. The hose 2033 can be extended and retracted synchronously with the rise and fall of the piston rod 2035. It is used to prevent dust from entering the air pressure system, ensure its sealing, and ensure the stability of the transmission. Furthermore, the current control component 301 includes a variable resistance box 3011 fixedly connected to the top of the bracket 101, the output end of the variable resistance box 3011 is electrically connected to the input end of the two sets of lower electrode fixtures 2011 through a wire, the input end of the variable resistance box 3011 is electrically connected to a current regulating switch 3012 fixedly connected to one side of the variable resistance box 3011, the current regulating switch 3012 is fixedly connected to a valve stem 3013 connected to the transmission component 302 through an internal conductive contact, and the transmission component 302 includes a slider 2 3021 fixedly connected to the counterweight 2022, the slider 2 3021 is fixedly connected to a rack 3022 at one end away from the counterweight 2022, and one side of the rack 3022 is meshed with a gear 3023 arranged on the inner wall of the upper fixed frame 102 through a rotating shaft, and the axial side of the gear 3023 is connected by a telescopic rod 3 024 is fixedly connected to the end of the valve stem 3013 away from the conductive contact piece inside the current regulating switch 3012; when the counterweight block 2022 and the upper clamping assembly 202 descend, they can synchronously drive the slider 2 3021 and the rack 3022 to move downward, and the rack 3022 engages with the gear 3023 for transmission, so that the gear 3023 drives the valve stem 3013 to rotate through the telescopic rod 3024, and adjusts the contact area of ​​the internal contact piece of the current regulating switch 3012, so that the current output from the variable resistance box 3011 to the lower electrode clamp 2011 gradually increases, and the heating temperature of the two sets of lower electrode clamps 2011 is gradually increased. In this process, the preheating temperature of the anchor chain increases synchronously with the current, realizing the coordinated incremental control of the clamping force and temperature, ensuring uniform preheating of the anchor chain, avoiding thermal stress caused by excessively rapid temperature changes, and providing a stable temperature basis for subsequent welding; It should be noted that when the upper clamping plate 2024 contacts the anchor chain, the inclined surface of the trapezoidal block 2025 and the trapezoidal block 1 2014 fit together, generating a mechanical force increase, causing the clamping force of the lower electrode clamp 2011 on the anchor chain to reach a peak value. At this time, the telescopic electric cylinder 2021 maintains pressure and fixes the position of the upper clamping plate 2024. Under the action of high current, the welding port of the anchor chain melts quickly, and the high clamping force of the two sets of lower electrode clamps 2011 squeezes and fuses the molten metal, which can effectively eliminate welding defects such as pores and lack of fusion caused by heating the anchor chain, improve welding quality, and significantly increase the strength of the anchor chain joint, meeting the high-strength use requirements of the anchor chain. It should also be noted that in order to prevent non-conductive components from being energized, the upper fixing frame 102 and the bracket 101 are coated with an insulating coating to block current conduction and ensure safe operation of the equipment; a ceramic insulating layer is set on the surface of slider 1 2012 and slider 2 3021 to prevent current leakage during sliding and avoid affecting the normal transmission of the components; the piston cylinder 2031 and the piston rod 2035 use an insulating lining to ensure that the pneumatic system is isolated from the conductive circuit and ensure stable operation of the pneumatic system; a mica insulating interlayer is set between the trapezoidal block 1 2014 and the trapezoidal block 2 2025 to avoid welding current shunting and ensure that the welding current effectively acts on the anchor chain; the buffer pad 1 2015, the buffer pad 2 2018 and the hose 2033 are made of high-temperature resistant rubber material to block welding slag and insulate, ensuring long-term and reliable operation of the equipment, ensuring the independence of the conductive path, ensuring the safe use of the equipment, and avoiding problems such as leakage that affect the welding effect and equipment life.

[0021] The working principle of the present invention is as follows: the anchor chain is placed in the annular groove at the top of the two sets of lower electrode clamps 2011. The spring 2017 pushes the movable rod 2016 through the fixed rod 2013, so that the slider 1 2012 drives the lower electrode clamp 2011 to generate an initial clamping force on the anchor chain, ensuring the stable positioning of the anchor chain. The buffer pad 1 2015 and the buffer pad 2 2018 on the slider 1 2012 form a sealing barrier during sliding, preventing welding slag from entering the interior of the upper fixed frame 102 during welding, avoiding affecting the transmission of internal components and providing a reliable foundation for subsequent welding processes. The telescopic electric cylinder 2021 is activated to drive the counterweight 2022 downward. The piston rod 2035 at the bottom of the fixed plate 2023 is inserted into the piston cylinder 2031, and air is pressed into the inner cavity of the fixed rod 2013 through the connecting pipe 2032. The air pressure pushes the movable rod 2016 to squeeze the slider 1 2012, so that the clamping force of the lower electrode clamp 2011 on the anchor chain increases as the air pressure rises. The hose 2033 rises and falls and stretches with the piston rod 2035, preventing dust from entering the air pressure system, ensuring a stable increase in clamping force, and keeping the anchor chain in a good clamping state during the preheating stage to avoid displacement due to insufficient clamping force. When the counterweight 2022 descends, it simultaneously drives the second slider 3021 and the rack 3022 downward. The rack 3022 engages with the gear 3023 for transmission, driving the valve stem 3013 to rotate via the telescopic rod 3024. This adjusts the contact area of ​​the contacts inside the current regulating switch 3012, gradually increasing the current output from the rheostat box 3011 to the lower electrode fixture 2011. The two sets of lower electrode fixtures 2011 form a closed loop with the rheostat box 3011 via wires. When current flows through the anchor chain welding port, heat is generated, causing the anchor chain temperature to rise synchronously with the increase in current, achieving uniform temperature control during the preheating stage. When the anchor chain expands due to heat, the air pressure in the inner cavity of the fixed rod 2013 and the spring 2017 form a coordinated retreat mechanism. The expansion of the anchor chain pushes the lower electrode fixture 2011 outward, allowing the movable rod 2016 to slide to a certain extent inside the fixed rod 2013. At the same time, the spring 2017 elastically deforms to absorb the expansion thrust, allowing the lower electrode fixture 2011 to produce a certain degree of radial retreat, adapting to the circumferential thermal deformation of the anchor chain, effectively releasing the circumferential thermal stress in the welding area, and reducing the risk of cracks. When the upper splint 2024 contacts the anchor chain, the inclined surfaces of the trapezoidal block 2025 and the trapezoidal block 1 2014 fit together to generate mechanical force, causing the clamping force of the lower electrode fixture 2011 to reach its peak. At this time, the telescopic electric cylinder 2021 maintains pressure and fixes the position of the upper splint 2024. The large current causes the anchor chain welding port to melt quickly. The high clamping force squeezes the molten metal into the gap, pushing the liquid metal to flow evenly along the annular weld, eliminating pores and achieving molecular-level fusion, thereby improving the strength of the anchor chain joint and meeting high-intensity usage requirements.

[0022] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A welding device for anchor chain production, characterized in that: include, The main unit (100) comprises a bracket (101) and an upper fixing frame (102) fixedly connected to the top of the bracket (101); The welding clamping unit (200) comprises a lower clamping assembly (201) arranged on the upper fixing frame (102) for heating, welding and side clamping of the anchor chain, an upper clamping assembly (202) arranged above the lower clamping assembly (201) for clamping the upper portion of the anchor chain, and an inflation assembly (203) arranged between the lower clamping assembly (201) and the upper clamping assembly (202) for applying pressure to the lower clamping assembly (201) during the downward pressing process of the upper clamping assembly (202); The current control unit (300) comprises a current control component (301) arranged on the bracket (101) for providing welding current to the lower clamping component (201), and a transmission component (302) arranged on the upper clamping component (202) for gradually increasing the output current of the current control component (301) during the downward pressing process of the upper clamping component (202).

2. A welding device for anchor chain production according to claim 1, characterized in that: The lower clamping assembly (201) comprises two groups of lower electrode clamps (2011) symmetrically arranged on the upper fixed frame (102), the tops of the two groups of lower electrode clamps (2011) are fixedly connected to a trapezoidal block 1 (2014), the bottoms of the two groups of lower electrode clamps (2011) are fixedly connected to a slider 1 (2012) slidably arranged inside the upper fixed frame (102), the sides of the two groups of sliders 1 (2012) close to each other are connected via a buffer pad 1 (215), and the sides of the two groups of sliders 1 (2012) away from each other are connected to the inner wall of the upper fixed frame (102) via a buffer pad 2 (2018).

3. The welding device for anchor chain production according to claim 2, characterized in that: A spring (217) is fixed to the side of the two sets of sliders (2012) that are away from each other, and the end of the spring (2017) away from the slider (2012) is fixedly connected to the fixed rod (2013), and the end of the fixed rod (2013) away from the spring (2017) is fixedly connected to the inside of the upper fixed frame (102). The inner wall of the fixed rod (2013) is slidably connected to a movable rod (2016), and the end of the movable rod (2016) away from the fixed rod (2013) is fixedly connected to one side of the slider (2012).

4. A welding device for anchor chain production according to claim 3, characterized in that: The upper clamping assembly (202) comprises a telescopic electric cylinder (2021) fixedly connected to the top of the upper fixing frame (102); the output end of the telescopic electric cylinder (2021) is fixedly connected to a counterweight block (2022) connected to the transmission assembly (302); and the bottom of the counterweight block (2022) is fixedly connected to a fixing plate (2023).

5. The welding device for anchor chain production according to claim 4, characterized in that: The bottom of the fixed plate (2023) is fixedly connected to an upper clamping plate (2024) arranged above the two groups of lower electrode clamps (2011), and trapezoidal blocks (2025) corresponding to the trapezoidal blocks (2014) are arranged on both sides of the upper clamping plate (2024). The tops of the two groups of trapezoidal blocks (2025) are fixedly connected to the bottom of the fixed plate (2023).

6. The welding device for anchor chain production according to claim 5, characterized in that: The inflation assembly (203) comprises a piston cylinder (2031) fixedly connected to the upper fixing frame (102), and the bottom of the piston cylinder (2031) is connected to one end of the fixing rod (2013) via a connecting pipe (2032).

7. The welding device for anchor chain production according to claim 6, characterized in that: The inner wall of the piston cylinder (2031) is sleeved with a rubber piston (2034), the top of the rubber piston (2034) is fixedly connected to a piston rod (2035), the top of the piston rod (2035) is fixedly connected to the bottom of the fixed plate (2023), and a hose (2033) is provided on the outside of the piston rod (2035), and the two ends of the hose (2033) are respectively fixedly connected to the bottom of the fixed plate (2023) and the top of the piston cylinder (2031).

8. The welding device for anchor chain production according to claim 7, characterized in that: The current control assembly (301) comprises a variable resistance box (3011) fixedly connected to the top of the bracket (101), the output end of the variable resistance box (3011) being electrically connected to the input ends of the two sets of lower electrode fixtures (2011) via a wire, the input end of the variable resistance box (3011) being electrically connected to a current regulating switch (3012) fixedly connected to one side of the variable resistance box (3011), and the current regulating switch (3012) being fixedly connected to a valve stem (3013) connected to the transmission assembly (302) via an internal conductive contact.

9. The welding device for anchor chain production according to claim 8, characterized in that: The transmission assembly (302) comprises a second slider (3021) fixedly connected to the counterweight (2022), wherein one end of the second slider (3021) away from the counterweight (2022) is fixedly connected to a rack (3022).

10. A welding device for anchor chain production according to claim 9, characterized in that: One side of the rack (3022) is meshedly connected to a gear (3023) which is rotatably arranged on the inner wall of the upper fixed frame (102) via a rotating shaft. One axial side of the gear (3023) is fixedly connected to an end of the valve stem (3013) away from the conductive contact inside the current regulating switch (3012) via a telescopic rod (3024).

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