Marine stainless steel pipe welding grounding device and method of use thereof

Abstract

The application discloses a marine stainless steel pipe welding grounding device and a use method thereof. The grounding cover shell is fixed on the outer wall of the pipe by sticking, and the contact mechanism is tightly pressed on the outer wall of the pipe by using the safety spring between the grounding cover shell and the contact mechanism. Then, the arc extinguishing mechanism is driven to move by the pressure rod mechanism to contact the contact mechanism, so that the welding grounding loop is conducted to form an optimal conduction loop. The grounding cover shell can be installed on the pipe according to the requirement, and the installation position is not limited. The convenience of the welding operation is greatly improved, and the welding operation efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, and in particular to a marine stainless steel pipe welding grounding device and its usage method. Background Technology

[0002] When welding stainless steel pipe fittings for LNG ships, the existing grounding circuit uses grounding clamps for grounding. The grounding clamps are made of metal clamps. Since the grounding clamps cannot be directly installed on the pipe fittings, their installation positions are limited. In addition, the metal material of the grounding clamps has poor compatibility with the stainless steel pipe fitting base material. During the welding process, if the grounding conductive medium contact surface accidentally separates from the base material, it may cause arcing / arc impact damage to the pipe fitting base material. Summary of the Invention

[0003] In view of this, the present invention provides a welding grounding device for marine stainless steel pipes and its usage method. This device can be directly and nearby installed at any position on the pipe base material during welding to achieve the best conduction circuit effect, and also has the function of preventing grounding arc protection.

[0004] A marine stainless steel pipe welding grounding device includes a grounding housing, a pressure rod mechanism, and an arc-extinguishing mechanism and a contact mechanism disposed within the grounding housing. The grounding cover is pasted and fixed to the outer wall of the pipe. The grounding cover and the contact mechanism are connected by a safety spring so that when the grounding cover is pasted to the outer wall of the pipe, the safety spring will press the contact mechanism tightly against the outer wall of the pipe. The grounding cover is connected to the grounding wire of the welding machine. The pressure rod mechanism moves through the grounding housing, the arc extinguishing mechanism is fixed at the end of the pressure rod mechanism located inside the grounding housing, and a limit member is provided on the rod segment of the pressure rod mechanism located outside the grounding housing; The contact mechanism and the arc extinguishing mechanism are arranged opposite to each other and connected by a spacer spring. When the pressure rod mechanism moves the arc extinguishing mechanism and makes the arc extinguishing mechanism contact the contact mechanism to make the grounding circuit of the welding machine conduction, the limiting part contacts the grounding cover. When the grounding cover accidentally falls during operation, the grounding cover pushes the limiting part under the action of the safety spring and makes the arc extinguishing mechanism and the contact mechanism disengage.

[0005] In a preferred embodiment, the grounding enclosure includes an enclosure body, one end of which is open and a base is fixed to it. An adhesive material is fixed to the base. A stuffing box is fixed to the middle of the other end of the enclosure body. A metal seat is fixed to the end of the stuffing box. A through hole is provided in the center of the stuffing box and the metal seat for the pressure rod mechanism to pass through.

[0006] In a preferred embodiment, a grounding stake for connecting to the welding machine's grounding wire is also fixed on the metal base.

[0007] In a preferred embodiment, both the housing body and the base are made of insulating material, the stuffing box is an annular structure made of graphite material, and the metal seat is a metal washer.

[0008] In a preferred embodiment, the pressure rod mechanism includes a guide rod, a screw fixed to one end of the guide rod, and a pressure cap fixed to the end of the screw. The arc extinguishing mechanism is fixed to one end of the guide rod. The guide rod passes vertically through the stuffing box and the metal seat and slides in contact with the stuffing box. The limiting member is fixed on the screw.

[0009] In a preferred embodiment, the arc extinguishing mechanism includes a contact electrode and a gland flange fixed around the contact electrode. The gland flange is a boss-shaped flange with its steps facing the contact mechanism.

[0010] In a preferred embodiment, the contact mechanism includes a contact seat, a grid gate fixed on the end face of the contact seat facing the contact electrode, and a tray. The grid gate is opposite to the contact electrode, and the tray is disposed outside the grid gate. A spacer spring is vertically disposed with one end fixed to the step of the cover flange and the other end fixed to the tray. A safety spring is vertically disposed with one end fixed to the grounding cover and the other end fixed to the edge of the tray.

[0011] In a preferred embodiment, a magnetic ring is also fixed on the tray at a position opposite to the lower surface of the gland flange.

[0012] In a preferred embodiment, the spring elasticity of the safety spring is greater than that of the spacer spring.

[0013] A method for using a marine stainless steel pipe welding grounding device includes the following steps: S1, the grounding cover is pasted and fixed to the outer wall of the pipe to be welded. During the process of fixing the grounding cover, the safety spring is compressed. Under the elastic force of the safety spring, the contact mechanism is pressed tightly against the outer wall of the pipe. S2, connect the grounding cover to the welding machine grounding wire; S3, the hand-held movable pressure rod mechanism, makes the contact electrode fixed to its arc extinguishing mechanism contact the grid of the contact mechanism, and the grounding circuit of the welding machine is connected; S4, start the welding machine to perform welding operations. During the welding operation, if the grounding cover accidentally falls off the outer wall of the pipe, at the moment of falling off, under the action of the safety spring, the grounding cover pushes against the limiting part, causing the contact electrode of the arc extinguishing mechanism to separate from the grid of the contact mechanism.

[0014] The beneficial effects of this invention are: 1. This invention fixes the grounding cover to the outer wall of the pipe by pasting it on, and uses a safety spring between the grounding cover and the contact mechanism to press the contact mechanism tightly against the outer wall of the pipe. Then, the pressure rod mechanism drives the arc extinguishing mechanism to move and contact the contact mechanism, thereby making the grounding circuit of the welded pipe conductive and forming an optimal conductive circuit. The grounding cover can be installed on the pipe as needed, and its installation position is not restricted, which greatly improves the convenience and efficiency of welding operations.

[0015] 2. This invention provides a limiting component on the pressure rod mechanism. When the grounding cover accidentally falls during the welding process, the grounding cover pushes against the limiting component under the action of the safety spring, causing the arc extinguishing mechanism to disengage from the contact mechanism. This prevents the contact seat of the contact mechanism from generating an electric arc between itself and the pipe, thus avoiding damage to the pipe caused by the electric arc.

[0016] 3. By setting the contact electrode and grid grid into a grid structure, the present invention can use the grid structure of the metal grid to evenly separate the electric arc and release the electric arc when the ground cover accidentally falls during the welding operation, so as to prevent the electric arc from being generated between the contact seat of the contact mechanism and the pipe and avoid the damage to the pipe caused by the electric arc.

[0017] 4. The installation position of this invention on pipe fittings is not limited, and its material is compatible with stainless steel rods. It is easy to operate, can be reused, and greatly reduces the production and construction costs of enterprises. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a marine stainless steel pipe welding grounding device.

[0020] Figure 2 This is a schematic diagram of the grounding enclosure.

[0021] Figure 3 This is a structural diagram of the pressure bar mechanism and the arc extinguishing mechanism.

[0022] Figure 4 This is a schematic diagram of the contact structure.

[0023] Figure 5 This is a schematic diagram showing the connection of the welding grounding circuit when this device is in use.

[0024] Figure 6 This is a schematic diagram of the device accidentally falling off the pipe.

[0025] Figure 7 This is a schematic diagram of the arcing generated during the separation of the contact electrode and the grid.

[0026] The meanings of the labels in the diagram are as follows: 1 is the grounding enclosure, 1.1 is the enclosure body, 1.2 is the base, 1.3 is the adhesive material, 1.4 is the grounding stake, 1.5 is the stuffing box, and 1.6 is the metal base. 2 is the pressure rod mechanism, 2.1 is the guide rod, 2.2 is the screw, 2.3 is the limiting component, and 2.4 is the pressure cap. 3 represents the arc-extinguishing mechanism, 3.1 represents the contact electrode, 3.2 represents the gland flange, and 3.3 represents the spacer spring. 4 represents the contact mechanism, 4.1 represents the contact seat, 4.2 represents the tray, 4.3 represents the magnet ring, 4.4 represents the safety spring, and 4.5 represents the grid. 5 represents pipe material. 6 represents electric arc pulling. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0028] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0029] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0030] In the description of this invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0031] To better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0032] The present invention provides a marine stainless steel pipe welding grounding device, including a grounding cover 1, a pressure rod mechanism 2, and an arc extinguishing mechanism 3 and a contact mechanism 4 disposed within the grounding cover 1.

[0033] The grounding cover 1 is pasted and fixed to the outer wall of the pipe. The grounding cover 1 is connected to the contact mechanism 4 by a safety spring 4.4 so that when the grounding cover 1 is pasted to the outer wall of the pipe, the safety spring 4.4 will press the contact mechanism 4 tightly onto the outer wall of the pipe. The grounding cover 1 is connected to the grounding wire of the welding machine.

[0034] Specifically, the grounding cover 1 includes a cover body 1.1, one end of the cover body 1.1 is open and a base 1.2 is fixed to that end, an adhesive material 1.3 is fixed on the base 1.2, a stuffing box 1.5 is fixed to the middle of the other end of the cover body 1.1, a metal seat 1.6 is fixed to the end of the stuffing box 1.5, and a through hole for the pressure rod mechanism 2 to pass through is provided in the center of the stuffing box 1.5 and the metal seat 1.6.

[0035] like Figure 1 As shown, the grounding cover 1 is a cylindrical shell with an open bottom. An annular base 1.2 is fixed to the bottom of the grounding cover 1, and adhesive material 1.3 is fixed to the lower surface of the base 1.2. The adhesive material 1.3 is used to attach and fix the entire device to the pipe to be welded. A through hole is provided in the center of the top of the grounding cover 1, and a stuffing box 1.5 is fixed in the through hole. An annular metal seat 1.6 is fixed to the top of the stuffing box 1.5.

[0036] The bottom opening of the grounding housing 1 should be larger than the size of the contact mechanism 4 to ensure that the contact mechanism 4 can be placed inside the grounding housing 1. Specifically, the bottom opening of the grounding housing 1 should be larger than the size of the contact seat 4.1 and the tray 4.2.

[0037] The inner wall of the grounding cover 1 is set as a stepped inner wall. The safety spring 4.4 is set vertically and one end is fixed at the step of the inner wall of the grounding cover 1, and the other end is fixed on the contact mechanism 4 (i.e. the upper surface of the contact seat 4.1).

[0038] In this embodiment, the housing body 1.1 and the base 1.2 are both made of insulating material (such as plastic), the stuffing box 1.5 is a ring structure made of graphite material (conductive and dry lubricated), the metal seat 1.6 is a metal washer, and the adhesive material 1.3 can be double-sided tape.

[0039] The pressure rod mechanism 2 moves through the center of the stuffing box 1.5 and the metal seat 1.6, and the arc extinguishing mechanism 3 is fixed at the end of the pressure rod mechanism 2 located inside the grounding housing 1. The pressure rod mechanism 2 is used to drive the arc extinguishing mechanism 3 to move up and down so that the arc extinguishing mechanism 3 comes into contact with the contact mechanism 4, and the rod of the pressure rod mechanism 2 also serves to conduct electricity.

[0040] The pressure rod mechanism 2 includes a guide rod 2.1, a screw 2.2 fixed to one end of the guide rod 2.1, and a pressure cap 2.4 fixed to the end of the screw 2.2. The arc extinguishing mechanism 3 is fixed to the end of the guide rod 2.1 located inside the grounding housing 1. The guide rod 2.1 vertically passes through the stuffing box 1.5 and the metal seat 1.6, and the guide rod 2.1 slides in contact with the stuffing box 1.5. A limiting member 2.3 is fixed on the screw 2.2. In this embodiment, the guide rod 2.1 and the screw 2.2 are both made of metal, the pressure cap 2.4 is a plastic pressure cap, and the limiting member 2.3 can be a limiting nut.

[0041] In use, the welder presses down on the pressure cap 2.4, and the guide rod 2.1, under the pressure, moves the arc-extinguishing mechanism 3 toward the contact mechanism 4, thereby bringing the contact electrode 3.1 of the arc-extinguishing mechanism 3 into contact with the grid gate 4.5 of the contact mechanism 4. The limiting member 2.3 is used to limit the travel distance of the contact electrode 3.1 of the arc-extinguishing mechanism 3 from its initial position to when it comes into contact with the grid gate 4.5 of the contact mechanism 4.

[0042] The position of the limiting member 2.3 on the screw 2.2 can be adjusted as needed. By adjusting the position of the limiting member 2.3 on the screw 2.2, the travel distance of the contact electrode 3.1 of the arc-extinguishing mechanism 3 from its initial position to its contact with the grid 4.5 of the contact mechanism 4 can be adjusted. Simultaneously, if the grounding cover 1 accidentally falls off during operation, the limiting member 2.3 can also cooperate with the metal base 1.6 to separate the contact electrode 3.1 from the grid 4.5, preventing an electric arc from forming between the contact base 4.1 of the contact mechanism 4 and the pipe, thus preventing damage to the pipe and helping to separate the arc-extinguishing mechanism 3 from the contact mechanism 4.

[0043] The metal base 1.6 can be connected to the grounding wire of the welding machine. By making the guide rod 2.1 slide in contact with the stuffing box 1.5 and the metal base 1.6, the current can be conducted through the metal base 1.6 and the stuffing box 1.5 to the guide rod 2.1, and then through the guide rod 2.1 to the contact electrode 3.1 of the arc extinguishing mechanism 3.

[0044] In a preferred embodiment, a grounding stake 1.4 for connecting to the grounding wire of the welding machine is also fixed on the metal base 1.6.

[0045] When the pressure rod mechanism 2 moves with the arc extinguishing mechanism 3 and the contact electrode 3.1 of the arc extinguishing mechanism 3 is stacked on the grid 4.5 of the contact mechanism 4, the grounding circuit of the welding machine is turned on. At this time, the limiting member 2.3 is in contact with the grounding cover 1, that is, the lower surface of the limiting member 2.3 is in contact with the top surface of the cover body 1.1.

[0046] The arc extinguishing mechanism 3 includes a contact electrode 3.1 and a gland flange 3.2 fixed around the contact electrode 3.1. The gland flange 3.2 is a boss-shaped flange with its steps facing the contact mechanism 4.

[0047] The contact electrode 3.1 is a metal grid, which is used to contact the grid gate 4.5 of the contact mechanism 4 and conduct current.

[0048] The gland flange 3.2 is a boss flange made of galvanized steel, with its steps facing the contact mechanism 4.

[0049] The contact mechanism 4 and the arc-extinguishing mechanism 3 are arranged opposite to each other and connected by a spacer spring 3.3. The spacer spring 3.3 is used to maintain a certain distance between the contact mechanism 4 and the arc-extinguishing mechanism 3 when the device is not in use, so as to prevent the contact electrode 3.1 from contacting the grid 4.5. The spacer spring 3.3 is arranged vertically, with one end fixed to the step of the cover flange 3.2 and the other end fixed to the tray 4.2 of the contact mechanism 4.

[0050] The contact mechanism 4 includes a contact seat 4.1, a grid 4.5 fixed on the end face of the contact seat 4.1 facing the contact electrode 3.1, and a tray 4.2. The tray 4.2 is located on the outside of the grid 4.5. The spacer spring 3.3 is vertically arranged with one end fixed to the step of the cover flange 3.2 and the other end fixed to the tray 4.2. The safety spring 4.4 is vertically arranged with one end fixed to the grounding cover 1 and the other end fixed to the edge of the tray 4.2. The spring elasticity of the safety spring 4.4 should be much greater than that of the spacer spring 3.3.

[0051] The grid 4.5 is also a metal grid, and its grid corresponds vertically to that of the contact electrode 3.1. When the grounding cover 1 accidentally falls during operation, under the action of the safety spring 4.4, the grounding cover 1 pushes against the limiting member 2.3, causing the guide rod 2.1 to move the contact electrode 3.1 away from the grid 4.5, so that the contact electrode 3.1 separates from the grid 4.5. During this process, the grid structure of the two can evenly separate the conducted electric arc, so as to avoid the generation of electric arc between the contact seat 4.1 and the pipe, and avoid the damage to the pipe caused by the electric arc.

[0052] In this embodiment, the contact seat 4.1 is a cylindrical metal conductor, such as stainless steel, or other metal materials; the grid 4.5 is fixed on the surface of the contact seat 4.1; the tray 4.2 is made of insulating material and is a hollow columnar structure with horizontal folded edges, and the tray 4.2 is fixed on the edge of the contact seat 4.1.

[0053] In a preferred embodiment, a magnetic ring 4.3 is also fixed on the tray 4.2 at a position opposite to the lower surface of the pressure cap flange 3.2. When the contact electrode 3.1 contacts the grid gate 4.5, the spacer spring 3.3 is compressed, and the magnetic ring 4.3 can attract the pressure cap flange 3.2, thereby providing a temporary fixing force for the contact between the contact electrode 3.1 and the grid gate 4.5. The attraction force of the magnetic ring 4.3 should be greater than the elastic force of the spacer spring 3.3, but the attraction force of the magnetic ring 4.3 is still much less than the spring elasticity of the safety spring 4.4.

[0054] This invention also provides a method for using a marine stainless steel pipe welding grounding device, specifically including the following steps: S1, the grounding cover 1 is attached and fixed to the outer wall of the pipe to be welded by adhesive material 1.3.

[0055] After the grounding cover 1 is glued on, the safety spring 4.4 is compressed, and under the elastic force of the safety spring 4.4, the contact mechanism 4 is pressed tightly against the outer wall of the pipe.

[0056] S2, connect the grounding cover 1 to the welding machine grounding wire.

[0057] S3, hold the movable pressure lever mechanism 2 and press down on the pressure cover 2.4. The downward pressure causes the guide rod 2.1 to move the entire arc-extinguishing mechanism 3 towards the contact mechanism 4, so that the contact electrode 3.1 fixed to the arc-extinguishing mechanism 3 comes into contact with the grid 4.5 of the contact mechanism 4, and the grounding circuit of the welding machine is connected. At this time, the spacer spring 3.3 is compressed, and the magnetic ring 4.3 attracts the pressure cover flange 3.2.

[0058] S4, start the welding machine to perform welding operations.

[0059] During welding operations, if the grounding cover 1 accidentally detaches from the outer wall of the pipe (e.g., due to impact or human error), the safety spring 4.4 is released the instant the grounding cover 1 detaches. Under the action of the safety spring 4.4, the grounding cover 1 pushes against the limiting member 2.3, causing the guide rod 2.1 to move the contact electrode 3.1 away from the grid 4.5, thereby separating the contact electrode 3.1 from the grid 4.5. During this process, the grid structure of the contact electrode 3.1 and the grid 4.5 can evenly separate the conducted electric arc, so as to avoid the generation of electric arc between the contact seat 4.1 and the pipe, and avoid damage to the pipe caused by the electric arc.

[0060] After contact electrode 3.1 separates from grid gate 4.5, the grounding circuit is broken.

[0061] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A marine stainless steel pipe welding grounding device, characterized in that, It includes a grounding enclosure (1), a pressure rod mechanism (2), and an arc extinguishing mechanism (3) and a contact mechanism (4) installed inside the grounding enclosure (1). The grounding cover (1) is pasted and fixed to the outer wall of the pipe. The grounding cover (1) and the contact mechanism (4) are connected by a safety spring (4.4) so ​​that when the grounding cover (1) is pasted to the outer wall of the pipe, the safety spring (4.4) will press the contact mechanism (4) tightly onto the outer wall of the pipe. The grounding cover (1) is connected to the grounding wire of the welding machine. The pressure rod mechanism (2) moves through the grounding housing (1), the arc extinguishing mechanism (3) is fixed at the end of the pressure rod mechanism (2) located inside the grounding housing (1), and a limit member (2.3) is provided on the rod segment of the pressure rod mechanism (2) located outside the grounding housing (1). The contact mechanism (4) and the arc extinguishing mechanism (3) are arranged opposite to each other and are connected by a spacer spring (3.3). When the pressure rod mechanism (2) moves the arc extinguishing mechanism (3) and makes the arc extinguishing mechanism (3) contact the contact mechanism (4) to make the grounding circuit of the welding machine conduct. At this time, the limiting member (2.3) contacts the grounding cover (1). When the grounding cover (1) falls accidentally during the operation, under the action of the elastic force of the safety spring (4.4), the grounding cover (1) pushes the limiting member (2.3) and makes the arc extinguishing mechanism (3) and the contact mechanism (4) disengage.

2. The marine stainless steel pipe welding grounding device according to claim 1, characterized in that, The grounding cover (1) includes a cover body (1.1), one end of the cover body (1.1) is open and a base (1.2) is fixed at that end, an adhesive material (1.3) is fixed on the base (1.2), a stuffing box (1.5) is fixed at the middle of the other end of the cover body (1.1), a metal seat (1.6) is fixed at the end of the stuffing box (1.5), and a through hole is provided in the center of the stuffing box (1.5) and the metal seat (1.6) for the pressure rod mechanism (2) to pass through.

3. The marine stainless steel pipe welding grounding device according to claim 2, characterized in that, The metal base (1.6) is also fixed with a grounding stake (1.4) for connection to the grounding wire of the welding machine.

4. The marine stainless steel pipe welding grounding device according to claim 2, characterized in that, The housing body (1.1) and the base (1.2) are both made of insulating material, the stuffing box (1.5) is a ring structure made of graphite material, and the metal seat (1.6) is a metal washer.

5. The marine stainless steel pipe welding grounding device according to claim 1 or 2, characterized in that, The pressure rod mechanism (2) includes a guide rod (2.1), a screw (2.2) fixed to one end of the guide rod (2.1), and a pressure cap (2.4) fixed to the end of the screw (2.2). The arc extinguishing mechanism (3) is fixed to one end of the guide rod (2.1). The guide rod (2.1) passes vertically through the stuffing box (1.5) and the metal seat (1.6) and slides in contact with the stuffing box (1.5). The limiting member (2.3) is fixed on the screw (2.2).

6. The marine stainless steel pipe welding grounding device according to claim 1, characterized in that, The arc extinguishing mechanism (3) includes a contact electrode (3.1) and a gland flange (3.2) fixed around the contact electrode (3.1). The gland flange (3.2) is a boss-shaped flange with its steps facing the contact mechanism (4).

7. The marine stainless steel pipe welding grounding device according to claim 6, characterized in that, The contact mechanism (4) includes a contact seat (4.1), a grid gate (4.5) fixed on the end face of the contact seat (4.1) facing the contact electrode (3.1) and a tray (4.2). The grid gate (4.5) is opposite to the contact electrode (3.1). The tray (4.2) is located outside the grid gate (4.5). The spacer spring (3.3) is vertically arranged and one end is fixed at the step of the pressure flange (3.2) and the other end is fixed on the tray (4.2). The safety spring (4.4) is vertically arranged and one end is fixed on the grounding cover (1) and the other end is fixed on the edge of the tray (4.2).

8. The marine stainless steel pipe welding grounding device according to claim 7, characterized in that, A magnetic ring (4.3) is also fixed on the tray (4.2) at a position opposite to the lower surface of the cover flange (3.2).

9. The marine stainless steel pipe welding grounding device according to claim 1, characterized in that, The spring elasticity of the safety spring (4.4) is greater than that of the spacer spring (3.3).

10. A method of using a marine stainless steel pipe welding grounding device according to any one of claims 1-9, characterized in that, Specifically, the following steps are included: S1, the grounding cover (1) is pasted and fixed on the outer wall of the pipe to be welded. During the process of fixing the grounding cover (1), the safety spring (4.4) is compressed. Under the elastic force of the safety spring (4.4), the contact mechanism (4) is pressed tightly on the outer wall of the pipe. S2, connect the grounding cover (1) to the welding machine grounding wire; S3, hold the movable pressure rod mechanism (2) to make the contact electrode (3.1) fixed in its arc extinguishing mechanism (3) contact the grid gate (4.5) of the contact mechanism (4), and the grounding circuit of the welding machine is turned on; S4, start the welding machine to perform welding operation. During the welding operation, if the grounding cover (1) accidentally falls off the outer wall of the pipe, at the moment of falling off, under the action of the elastic force of the safety spring (4.4), the grounding cover (1) pushes against the limiting part (2.3) and causes the contact electrode (3.1) of the arc extinguishing mechanism (3) to separate from the grid gate (4.5) of the contact mechanism (4).

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