A nitrogen-charged connection device and a nitrogen-charged system

Abstract

The application discloses a nitrogen-filling connecting device and a nitrogen-filling system, and relates to the technical field of nitrogen-filling equipment. The nitrogen-filling connecting device can comprise a main body, a pressing buckle assembly, a gas pipe joint and two wires. The main body is provided with a connecting cavity for embedding a metal pipe and is also provided with a connecting hole. The pressing buckle assembly is installed on the main body, and the gas pipe joint is fixed in the connecting cavity. The two wires penetrate through the connecting hole and are electrically connected with a controller of the nitrogen-filling system respectively. The wiring terminals of the two wires are fixed on the cavity wall of the connecting cavity near the gas pipe joint respectively. In the case that the metal pipe is in gas path communication with the gas pipe joint, the metal pipe and the two wires form an electric circuit. The connection stability of the metal pipe and the nitrogen-filling joint can be ensured under the pressing of the pressing buckle assembly, and the controller can detect the electric circuit and accurately detect the assembly of the metal pipe and the gas pipe joint, so that the nitrogen-filling is carried out after the assembly is in place, and the welding quality of the metal pipe is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nitrogen filling equipment, in particular to a nitrogen filling connecting device and a nitrogen filling system. BACKGROUND

[0002] In some automated equipment including metal pipes, nitrogen filling operation is usually required to avoid oxidation and pollution during welding of the metal pipes. In the prior art, the connecting device connecting the metal pipe and the nitrogen filling connector is usually manually operated, and the nitrogen filling condition is mainly determined by manual evaluation according to the nitrogen filling time. Thus, the metal pipe and the nitrogen filling connector are prone to fall off, and it is difficult to determine whether the metal pipe has been filled with nitrogen. SUMMARY

[0003] In view of the above problems, the present application is proposed to provide a nitrogen filling connecting device and a nitrogen filling system which can overcome the above problems or at least partially solve the above problems.

[0004] Based on the first aspect of the present application, a nitrogen filling connecting device is provided, which comprises:

[0005] a main body, the main body being provided with a connecting cavity for embedding a metal pipe and a connecting hole;

[0006] a pressing buckle assembly, the pressing buckle assembly being installed on the main body to press the metal pipe in the connecting cavity to form a limit;

[0007] a gas pipe connector, the gas pipe connector being fixed in the connecting cavity to communicate with the metal pipe for nitrogen filling;

[0008] two wires, the two wires penetrating through the connecting hole and being electrically connected with a controller of a nitrogen filling system, wherein the terminal ends of the two wires are fixed on the cavity wall near the gas pipe connector in the connecting cavity, and when the metal pipe communicates with the gas pipe connector, the metal pipe presses the two terminal ends to form an electric circuit with the two wires.

[0009] Optionally, a movable groove is provided along the axial direction of the main body, and the pressing buckle assembly comprises:

[0010] a pin shaft, the pin shaft being located in the movable groove and being connected with the main body;

[0011] a pressing buckle, the middle region of the pressing buckle being rotatably connected to the pin shaft so that the two ends of the pressing buckle press the metal pipe when rotating, wherein a first clamping groove parallel to the axis of the pin shaft is provided on the pressing buckle;

[0012] An elastic rope is sleeved on the first clamping groove to keep the press buckle and the metal pipe in pressure contact by the deformation force of the elastic rope.

[0013] Optionally, the first clamping groove is opened between the middle region of the press buckle and the end close to the gas pipe joint.

[0014] Optionally, a second clamping groove is opened on the main body for sleeving the elastic rope.

[0015] Optionally, the end of the press buckle away from the gas pipe joint extends out of the main body.

[0016] Optionally, in the case that the metal pipe and the wire form a power circuit, the end of the press buckle close to the gas pipe joint forms axial pressure contact with the connector of the metal pipe.

[0017] Optionally, the pin shaft is inserted into the main body.

[0018] Optionally, the main body is made of nylon, polypropylene or polyethylene.

[0019] Optionally, in the case that the number of the connecting holes is two, two wires are respectively threaded through different connecting holes.

[0020] Based on the second aspect of the present application, a nitrogen charging system is also provided, which comprises the nitrogen charging connecting device according to any one of the above-mentioned application contents, a controller electrically connected with the two wires, and a nitrogen charging device electrically connected with the controller, wherein the nitrogen charging device is started to charge the metal pipe in the case that the metal pipe is communicated with the gas pipe joint according to the detection of the power circuit.

[0021] Compared with the prior art, the nitrogen filling connecting device in the application can include a main body, a pressing buckle assembly, a gas pipe joint and two wires, wherein the main body is provided with a connecting cavity for embedding a metal pipe and is also provided with a connecting hole. The pressing buckle assembly is installed on the main body to press the metal pipe and fix the position of the metal pipe in the connecting cavity. The gas pipe joint is fixed in the connecting cavity to communicate with the metal pipe in gas path for nitrogen filling. The two wires pass through the connecting hole and are electrically connected with a controller of a nitrogen filling system respectively, wherein the terminal ends of the two wires are fixed on the cavity wall near the gas pipe joint in the connecting cavity respectively, and in the case that the metal pipe communicates with the gas pipe joint in gas path, the metal pipe presses the two terminal ends to form an electric circuit with the two wires. Thus, under the pressing of the pressing buckle assembly, the connection stability of the metal pipe and the nitrogen filling joint can be ensured, and the electric circuit can be detected by the controller to accurately detect the assembly of the metal pipe and the gas pipe joint, so that the nitrogen filling is performed after the assembly is in place, which helps to improve the welding quality of the metal pipe.

[0022] The above description is only a summary of the technical scheme of the application. In order to make the technical means of the application more clear and understandable, the specific embodiments of the application can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0023] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Furthermore, the same reference numerals are used throughout the several drawings to designate the same or similar parts.

[0024] In the drawings:

[0025] Figure 1 is a perspective structural schematic view of a nitrogen filling connecting device provided by an embodiment of the application;

[0026] Figure 2 is Figure 1 a structural front view schematic view of the nitrogen filling connecting device in the application;

[0027] Figure 3 is Figure 1 a structural top view schematic view of the nitrogen filling connecting device in the application;

[0028] Figure 4 is a structural sectional view schematic view of a nitrogen filling connecting device provided by an embodiment of the application;

[0029] Figure 5 is a structural perspective schematic view of a main body provided by an embodiment of the application;

[0030] Figure 6 is Figure 1 is a right view schematic diagram of the structure of the nitrogen filling connecting device;

[0031] Reference signs: 1, main body; 11, connecting cavity; 12, connecting hole; 13, movable slot; 14, second clamping groove; 15, mounting hole; 2, press buckle assembly; 21, pin shaft; 22, press buckle; 221, first clamping groove; 23, elastic rope; 3, air pipe joint; 4, wire; 5, metal pipe; 51, connecting head. DETAILED DESCRIPTION

[0032] Exemplary embodiments of the present application will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it is understood that the present application can be embodied in various forms without being limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

[0033] With reference to Figures 1-6 , the present embodiment provides a nitrogen filling connecting device, which can include a main body 1, a press buckle assembly 2, an air pipe joint 3, and two wires 4, wherein:

[0034] The main body 1 is provided with a connecting cavity 11 for embedding a metal pipe 5, and is further provided with a connecting hole 12. The press buckle assembly 2 is installed on the main body 1 to press the metal pipe 5 located in the connecting cavity 11 to form a limit. The air pipe joint 3 is fixed in the connecting cavity 11 to communicate with the metal pipe 5 in gas path for nitrogen filling. The two wires 4 pass through the connecting hole 12 and are respectively electrically connected to the controller of the nitrogen filling system, wherein the terminal ends of the two wires 4 are respectively fixed on the cavity wall of the connecting cavity 11 close to the air pipe joint 3, and in the case that the metal pipe 5 and the air pipe joint 3 are in gas path communication, the metal pipe 5 respectively presses the two terminal ends to form an electric circuit with the two wires 4.

[0035] In the embodiment of the present application, the main body 1 can be a circular tube structure, and the metal pipe 5 can be a copper pipe, a stainless steel pipe or other pipe requiring nitrogen protection. The cross-sectional shape of the connecting cavity 11 corresponding to the embedded area of the metal pipe 5 can be circular, and the cross-sectional shape of the connecting cavity 11 corresponding to the embedded area of the gas pipe joint 3 is adapted to the cross-sectional shape of the gas pipe joint 3, that is, the connecting cavity 11 and the gas pipe joint 3 are fixedly connected in clearance fit or interference fit. For example, the cross-sectional shape of the gas pipe joint 3 can be a regular shape such as a hexagon, and the cross-sectional shape of the connecting cavity 11 corresponding to the embedded area of the gas pipe joint 3 is also a hexagon. Those skilled in the art can set the cross-sectional shape of the connecting cavity 11 corresponding to the embedded area according to the cross-sectional shape of the actual gas pipe joint 3, which is not limited herein.

[0036] For another example, the metal pipe 5 can be in clearance fit with the main body 1, so that the center deviation of the metal pipe 5 when moving in the connecting cavity 11 can be avoided, and the consistency of the concentricity of the metal pipe 5 and the gas pipe joint 3 is reduced, so that the problem that the gas path between the metal pipe 5 and the gas pipe joint 3 cannot be connected occurs.

[0037] The pressing buckle assembly 2 is used to press the metal pipe 5 embedded in the main body 1, and an external force is applied to the metal pipe 5, so that the relative position of the metal pipe 5 relative to the main body 1 can be limited. In other words, when the metal pipe 5 is embedded in the connecting cavity 11 and moves along the connecting cavity 11 to approach the gas pipe joint 3 until the metal pipe 5 is in contact with the gas pipe joint 3 and is connected in place, the position of the metal pipe 5 in this case is suitable for nitrogen filling.

[0038] In an example, the metal pipe 5 and the gas pipe joint 3 can be connected in plug-in form. For example, the gas pipe joint 3 extends into the metal pipe 5, and the gas tightness between the gas pipe joint 3 and the metal pipe 5 is maintained. In another example, the metal pipe 5 and the gas pipe joint 3 can be in surface contact, that is, the metal pipe 5 is pressed by the pressing force of the pressing buckle assembly 2, and the metal pipe 5 and the gas pipe joint 3 are in surface contact in the axial direction of the main body 1, and the gas tightness between the gas pipe joint 3 and the metal pipe 5 is maintained by the surface contact.

[0039] Therefore, when the gas pipe joint 3 and the metal pipe 5 are connected in place, the pressing buckle assembly 2 is operated to press the metal pipe 5, so that the metal pipe 5 cannot move away from the gas pipe joint 3 along the main body 1 under the action of an external force during nitrogen filling. Therefore, the connection stability of the metal pipe 5 and the gas pipe joint 3 can be improved.

[0040] Two wires 4 pass through the connecting hole 12 and are electrically connected to the controller of the nitrogen filling system. The terminals of the two wires 4 are fixed to the wall of the connecting cavity 11 near the air pipe joint 3. That is, when the metal pipe 5 is moved to the position in which the metal pipe 5 is in air communication with the air pipe joint 3 (i.e., when the plug-in assembly is completed), the metal pipe 5 is in pressure contact with the terminals of the two wires 4. Since the metal pipe 5 has the electric conduction characteristic, when the metal pipe 5 is in air communication with the air pipe joint 3, the metal pipe 5 and the two wires 4 form an electric conduction loop. Thus, when the controller electrically connected to the two wires 4 detects that the metal pipe 5 is in air communication with the air pipe joint 3 according to the electric conduction loop, the controller starts the nitrogen filling device to fill nitrogen into the metal pipe 5.

[0041] In an example, in order to avoid damage to the outer surface of the metal pipe 5 caused by the terminals of the wires 4, the terminals of the wires 4 are made of copper material and are embedded in the main body 1. For example, the terminals of the wires 4 are made of copper material and are spring pieces arranged in the connecting cavity 11. Thus, when the metal pipe 5 is in air communication with the air pipe joint 3, the metal pipe 5 is in pressure contact with the spring pieces, so that the metal pipe 5 and the two wires 4 form an electric conduction loop. After the metal pipe 5 is removed, the spring pieces can restore to the original shape under the action of the shape deformation restoring force. Thus, the contact stability between the metal pipe 5 and the wires 4 can be ensured, and the surface damage to the metal pipe 5 can be further reduced by the shape deformation ability of the spring pieces, so that the product quality of the metal pipe 5 is ensured.

[0042] In an example, an indicator light can be coupled between the controller and any one of the two wires 4, and the indicator light is used to indicate whether the metal pipe 5 is connected to the air pipe joint 3. For example, the controller provides a working voltage to the indicator light, and when the metal pipe 5 and the two wires 4 form an electric conduction loop, the corresponding indicator light is on. The operator observes the indicator light to determine that the metal pipe 5 is assembled in place, and at this time, the metal pipe 5 is in air communication with the air pipe joint 3, so that the nitrogen filling operation of the metal pipe 5 can be performed. If the indicator light is not on, it is determined that the metal pipe 5 is not assembled in place. The operator moves the metal pipe 5 towards the air pipe joint 3 until the indicator light is on. Then, the nitrogen filling operation of the metal pipe 5 is performed. If the indicator light is still not on, it is possible that the indicator light is damaged or the wire 4 is damaged, and troubleshooting needs to be performed. Thus, according to the on-off state of the indicator light, it is determined whether the metal pipe 5 is assembled in place or whether the metal pipe 5 is in air communication with the air pipe joint 3. Thus, the nitrogen filling is performed after the metal pipe 5 and the air pipe joint 3 are assembled in place, which helps to improve the welding quality of the metal pipe 5.

[0043] The nitrogen filling connecting device can include a main body 1, a pressing buckle assembly 2, a gas pipe joint 3 and two wires 4. The main body 1 is provided with a connecting cavity 11 for embedding a metal pipe 5, and is further provided with a connecting hole 12. The pressing buckle assembly 2 is installed on the main body 1 to press the metal pipe 5 and fix the metal pipe 5 in the connecting cavity 11. The gas pipe joint 3 is fixed in the connecting cavity 11 to communicate with the metal pipe 5 in gas path for nitrogen filling. The two wires 4 pass through the connecting hole 12 and are electrically connected with a controller of a nitrogen filling system respectively. The connecting terminals of the two wires 4 are fixed on the cavity wall of the connecting cavity 11 near the gas pipe joint 3 respectively. When the metal pipe 5 communicates with the gas pipe joint 3 in gas path, the metal pipe 5 presses the two connecting terminals to form an electric circuit with the two wires 4. Thus, the connecting stability of the metal pipe 5 and the nitrogen filling joint can be ensured under the pressing of the pressing buckle assembly 2. Whether the electric circuit is formed can be detected by the controller to accurately detect whether the metal pipe 5 and the gas pipe joint 3 are assembled in place, so that the nitrogen filling is performed after the assembly is in place, which helps to improve the welding quality of the metal pipe 5.

[0044] An optional embodiment of the application is shown in Figure 1 、 Figure 3 、 Figure 5 and Figure 6 , an active slot 13 is formed in the axial direction of the main body 1. The pressing buckle assembly 2 can include a pin shaft 21, a pressing buckle 22 and a elastic rope 23, wherein:

[0045] The pin shaft 21 is located in the active slot 13 and is connected with the main body 1. The main body 1 is provided with a mounting hole 15 for assembling the pin shaft 21. The middle region of the pressing buckle 22 is rotationally connected with the pin shaft 21, so that the two ends of the pressing buckle 22 are pressed against the metal pipe 5 when rotating. The pressing buckle 22 is provided with a first clamping groove 221 parallel to the axis of the pin shaft 21. The elastic rope 23 is sleeved on the first clamping groove 221 to keep the pressing buckle 22 and the metal pipe 5 pressed by the deformation force of the elastic rope 23.

[0046] In this embodiment of the invention, the opening of the movable groove 13 is oriented towards the metal tube 5. The pin 21 passes through the mounting hole 15 and penetrates the body 1 radially. The buckle 22, rotatably connected to the pin 21, has a certain thickness radially along the body 1. The inner end face of the buckle 22 near the connecting cavity 11 is flush with the inner surface of the body 1; that is, the inner surface of the buckle 22 is arc-shaped. In another example, the inner end face of the buckle 22 near the connecting cavity 11 is lower than the inner surface of the body 1; that is, the inner end face of the buckle 22 near the connecting cavity 11 is concave relative to the inner surface of the body 1. This prevents the buckle 22 from affecting the movement of the metal tube 5 within the connecting cavity 11.

[0047] When the middle region of the snap fastener 22 is rotatably connected to the pin 21, both ends of the snap fastener 22 can make contact with the metal tube 5 when rotating. In one example, refer to... Figure 2 and Figure 3 As shown, the first slot 221 is formed between the middle region of the snap fastener 22 and the end near the tracheal connector 3. In another example, the first slot 221 may also be formed between the middle region of the snap fastener 22 and the end away from the tracheal connector 3. Thus, under the action of the elastic cord 23, one end of the snap fastener 22 can be extended obliquely into the connecting cavity 11.

[0048] For example, if the first slot 221 is located between the middle area of ​​the snap fastener 22 and the end away from the tracheal connector 3, then when the metal tube 5 enters the connecting cavity 11, the operator needs to press the end of the snap fastener 22 near the tracheal connector 3, causing the snap fastener 22 to rotate away from the end of the tracheal connector 3 around the pin 21 away from the connecting cavity 11. Once the metal tube 5 and the tracheal connector 3 are connected in place, the pressure on the end of the snap fastener 22 near the tracheal connector 3 is released. Under the deformation restoring force of the elastic rope 23, the end of the snap fastener 22 away from the tracheal connector 3 moves closer to the connecting cavity 11 and presses against the metal tube 5. After nitrogen filling is completed, the operator needs to press the end of the buckle 22 near the end of the air pipe connector 3 to move the buckle 22 away from the end of the air pipe connector 3 and rotate it around the pin 21 away from the connecting cavity 11. At this time, the pressure on the metal tube 5 is released, and the operator can pull back the metal tube 5 to perform the nitrogen filling operation of the next metal tube 5.

[0049] For another example, if the first clamping groove 221 is arranged between the middle region of the pressing buckle 22 and the end close to the tracheal connector 3, after the metal pipe 5 enters the connecting cavity 11 and moves a distance, the metal pipe 5 is in contact with the end of the pressing buckle 22 close to the tracheal connector 3, under the action of the axial pressure of the metal pipe 5, the end of the pressing buckle 22 close to the tracheal connector 3 is slowly lifted up, and under the action of the deformation recovery force of the elastic cord 23, the end of the pressing buckle 22 close to the tracheal connector 3 is slowly rotated away from the connecting cavity 11. Until the metal pipe 5 and the tracheal connector 3 are connected in place, the end of the pressing buckle 22 close to the tracheal connector 3 is in contact. Alternatively, after the metal pipe 5 enters the connecting cavity 11, the operator needs to press the end of the pressing buckle 22 away from the tracheal connector 3, so that the end of the pressing buckle 22 close to the tracheal connector 3 is rotated away from the connecting cavity 11 around the pin shaft 21. Thus, the connection efficiency of the metal pipe 5 and the tracheal connector 3 can be improved. After the nitrogen filling is completed, the operator needs to press the end of the pressing buckle 22 away from the tracheal connector 3, so that the end of the pressing buckle 22 close to the tracheal connector 3 is rotated away from the connecting cavity 11 around the pin shaft 21, at this time, the contact force of the metal pipe 5 is removed, and the operator can pull out the metal pipe 5 to perform the next nitrogen filling operation of the metal pipe 5.

[0050] As a preferred embodiment, the first clamping groove 221 is arranged between the middle region of the pressing buckle 22 and the end close to the tracheal connector 3, which can reduce the number of operations of the operator on the pressing buckle 22 during the nitrogen filling process, that is, the operator only needs to press the pressing buckle 22 once during the nitrogen filling process, which is more convenient to reduce the working strength of the operator and simplify the operation process.

[0051] As an optional embodiment, the main body 1 is provided with a second clamping groove 14 for sleeving the elastic cord 23.

[0052] In the embodiment, the second clamping groove 14 arranged on the main body 1 can be used to limit the elastic cord 23. Compared with the elastic cord 23 sleeved on the outer surface of the main body 1, the elastic cord 23 sleeved in the second clamping groove 14 can avoid repeated friction during use, performance loss caused by axial displacement, and reduce the service life of the elastic cord 23. The second clamping groove 14 for sleeving the elastic cord 23 can protect the elastic cord 23 and reduce the axial displacement of the elastic cord 23. Thus, the service life of the elastic cord 23 can be improved, and the elastic cord 23 can provide a stable contact force to the metal pipe 5. The elastic cord 23 can be made of rubber.

[0053] As an optional embodiment,Figures 1-4 As shown in the figure, the pressing buckle 22 extends to the outside of the main body 1 from the end of the tracheal connector 3.

[0054] In the embodiment of the present application, the pressing buckle 22 extends to the outside of the main body 1 from the end of the tracheal connector 3, and extends a certain length, so that it is convenient for the operator to press after the nitrogen filling, and the operation convenience of the device is improved.

[0055] An optional embodiment of the present application is described with reference to the figure Figure 4 As shown in the figure, in the case that the metal pipe 5 and the wire 4 form a power circuit, the end of the pressing buckle 22 close to the tracheal connector 3 forms an axial pressure contact with the connector 51 of the metal pipe 5.

[0056] In the embodiment of the present application, the connector 51 of the metal pipe 5 is usually larger in diameter (also referred to as a horn) than the body diameter of the metal pipe 5, so as to facilitate insertion between the tracheal connector 3. Among them, the connector 51 can be gap fitted with the connecting cavity 11. Correspondingly, in order to better limit the metal pipe 5, in the case that the metal pipe 5 and the wire 4 form a power circuit (i.e. connected in place), the end of the pressing buckle 22 close to the tracheal connector 3 just forms an axial pressure contact with the connector 51 of the metal pipe 5. That is, the pressing buckle 22 forms a pressure contact with the end surface of the connector 51 and the body of the metal pipe 5. Thus, it can avoid the metal pipe 5 from loosening and other conditions under the action of external force during the nitrogen filling process, and ensure the continuity of the nitrogen filling process.

[0057] In an optional embodiment of the present application, the pressing buckle 22 is made of copper material. Thus, when the pressing buckle 22 is in pressure contact with the metal pipe 5, the surface damage to the metal pipe 5 can be reduced.

[0058] In an optional embodiment of the present application, the pin shaft 21 is inserted into the main body 1.

[0059] In the embodiment of the present application, when the pin shaft 21 is inserted into the main body 1, the pin shaft 21 and the main body 1 can be detachably connected, so that the pin shaft 21 can be easily disassembled and reused. Among them, the pin shaft 21 can be made of stainless steel material, for example, the pin shaft 21 can be made of 304 stainless steel or 316 stainless steel material, so that the pin shaft 21 has the characteristics of high mechanical strength, corrosion resistance and wear resistance. Thus, the service life of the pin shaft 21 in the device application environment can be improved.

[0060] In an optional embodiment of the present application, the main body 1 is made of one of the following materials: nylon, polypropylene and polyethylene.

[0061] In this invention, the nylon material possesses high tensile strength, wear resistance, and corrosion resistance; the polypropylene (PP) material possesses corrosion resistance, wear resistance, and high tensile strength; and the polyethylene (PE) material possesses abrasion resistance, wear resistance, and high tensile strength. Considering the application environment of the device, the main body 1 needs to possess certain wear resistance and corrosion resistance. Therefore, using one of the materials selected from nylon, polypropylene, and polyethylene to make the main body 1 can effectively improve the service life of the main body 1 and optimize the overall performance of the device while reducing the overall weight of the device.

[0062] An optional embodiment of the invention, referring to... Figure 4 and Figure 5 As shown, when there are two connection holes 12, the two wires 4 are respectively passed through different connection holes 12.

[0063] In this invention, when there is only one connecting hole 12, two wires 4 can pass through the same connecting hole 12 and enter the connecting cavity 11; when there are two connecting holes 12, the two wires 4 can pass through different connecting holes 12 and enter the connecting cavity 11. This expands the installation space of the terminals of the two wires 4 within the connecting cavity 11.

[0064] This invention also provides a nitrogen filling system, which includes a nitrogen filling connection device as described in any of the above embodiments, a controller electrically connected to the two wires 4 respectively, and a nitrogen filling device electrically connected to the controller. When the power-on circuit detects that the metal tube 5 is connected to the gas pipe connector 3, the nitrogen filling device is activated to fill the metal tube 5 with nitrogen.

[0065] In this embodiment of the invention, the controller can be a circuit board or a PLC (Programmable Logic Controller). Correspondingly, the nitrogen filling device can include a solenoid valve, which is electrically connected to the controller. When the controller detects that the metal tube 5 and the gas pipe connector 3 are connected according to the energizing circuit, it outputs a start signal to the solenoid valve, opening the valve and allowing nitrogen gas to be introduced into the metal tube 5 through the gas pipe connected to the gas pipe connector 3.

[0066] In an example, the nitrogen filling condition in the metal pipe 5 can be determined according to the nitrogen filling time, for example, the nitrogen filling time of each metal pipe 5 is a first time, after the first time, the controller outputs a stop signal to close the valve of the electromagnetic valve, so as to perform the nitrogen filling operation of the next metal pipe 5.

[0067] In another example, the nitrogen filling device can further include a nitrogen storage structure, so that a pressure gauge can be arranged in the nitrogen storage structure, and the pressure gauge is electrically connected with the controller, so that the controller can determine the corresponding nitrogen discharge capacity according to the pressure value detected by the pressure gauge. Therefore, when the amount of nitrogen in the metal pipe 5 is sufficient, the controller outputs a stop signal to close the valve of the electromagnetic valve, so as to perform the nitrogen filling operation of the next metal pipe 5. Thus, the welding quality and efficiency of the metal pipe 5 can be improved, and the quality risk caused by oxidation of the metal pipe 5 can be avoided.

[0068] In summary, the embodiment of the present application discloses a nitrogen filling connection device and a nitrogen filling system. The device can include a main body 1, a pressing buckle assembly 2, a gas pipe joint 3, and two wires 4. The main body 1 is provided with a connecting cavity 11 for embedding a metal pipe 5, and is also provided with a connecting hole 12. The pressing buckle assembly 2 is installed on the main body 1 to press the metal pipe 5 and fix the position of the metal pipe 5 in the connecting cavity 11. The gas pipe joint 3 is fixed in the connecting cavity 11 to communicate with the metal pipe 5 in gas circuit for nitrogen filling. The two wires 4 penetrate the connecting hole 12 and are electrically connected with the controller of the nitrogen filling system. The connection terminals of the two wires 4 are fixed on the cavity wall near the gas pipe joint 3 in the connecting cavity 11, and when the metal pipe 5 communicates with the gas pipe joint 3 in gas circuit, the metal pipe 5 presses the two connection terminals to form a power circuit with the two wires 4. Thus, under the pressing of the pressing buckle assembly 2, the connection stability of the metal pipe 5 and the nitrogen filling joint can be ensured, and whether the metal pipe 5 and the gas pipe joint 3 are assembled in place can be accurately detected by the controller detecting whether the power circuit is formed, so that the nitrogen filling is performed after the assembly is in place, which helps to improve the welding quality of the metal pipe 5.

[0069] Each of the embodiments in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same and similar parts of each embodiment can be referred to each other.

[0070] As can be easily thought by those skilled in the art, any combination application of each of the above embodiments is feasible, so any combination of each of the above embodiments is an embodiment of the present application, but due to the limitation of the length, the above is not described in detail here.

[0071] In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application can be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been described in detail in order not to obscure understanding of this description.

[0072] Similarly, it is to be understood that the embodiments of the application can be

[0073] Also, it is to be understood that the features of the dependent claims can be combined with those of the independent claims in any way deemed appropriate by the skilled person unless expressly claimed otherwise. Furthermore, it is expressly intended that aspects of the application which, alone or in combination, do not solve a problem which is dependent on a feature should not be deemed to be prerequisite to the practice of the application.

Claims

1. A nitrogen-filling connection device, characterized in that, The device includes: The main body (1) has a connecting cavity (11) for embedding a metal tube (5) and a connecting hole (12); A snap-fit ​​assembly (2) is mounted on the main body (1) to press against the metal tube (5) located in the connecting cavity (11) to form a limit; a movable groove (13) is provided along the axial direction of the main body (1), and the snap-fit ​​assembly (2) includes: a pin (21), which is located in the movable groove (13) and connected to the main body (1); and a snap-fit ​​(22), the middle area of ​​which is rotatably connected. The buckle (22) is attached to the pin (21) so that when the two ends of the buckle (22) rotate, they form a pressing contact with the metal tube (5). The buckle (22) has a first groove (221) parallel to the axis of the pin (21). An elastic rope (23) is sleeved on the first groove (221) so that the buckle (22) and the metal tube (5) are pressed together by the deformation force of the elastic rope (23). The tracheal connector (3) is fixed inside the connecting cavity (11) to communicate with the metal tube (5) for nitrogen filling; Two wires (4) pass through the connection hole (12) and are electrically connected to the controller of the nitrogen filling system. The terminals of the two wires (4) are fixed in the cavity wall of the connection cavity (11) near the air pipe connector (3). When the metal pipe (5) is connected to the air pipe connector (3), the metal pipe (5) presses against the two terminals to form an electrical circuit with the two wires (4). When there are two connection holes (12), the two wires (4) pass through different connection holes (12).

2. The nitrogen-filling connection device according to claim 1, characterized in that, The first slot (221) is formed between the middle region of the snap fastener (22) and the end near the tracheal connector (3).

3. The nitrogen-filling connection device according to claim 1, characterized in that, The main body (1) is provided with a second slot (14) for the elastic rope (23) to be fitted.

4. The nitrogen-filling connection device according to claim 2, characterized in that, The end of the snap fastener (22) away from the tracheal connector (3) extends out of the body (1).

5. The nitrogen-filling connection device according to claim 2, characterized in that, When the metal tube (5) and the wire (4) form an electrical circuit, the end of the snap fastener (22) near the air pipe connector (3) forms an axial contact with the connector (51) of the metal tube (5).

6. The nitrogen-filling connection device according to claim 1, characterized in that, The pin (21) is inserted into the body (1).

7. The nitrogen-filling connection device according to claim 1, characterized in that, The main body (1) is made of one of the following materials: nylon, polypropylene, and polyethylene.

8. A nitrogen-filling system, characterized in that, The system includes a nitrogen filling connection device as described in any one of claims 1-7, a controller electrically connected to the two wires (4) respectively, and a nitrogen filling device electrically connected to the controller. When the gas path of the metal tube (5) is connected to the gas pipe connector (3) according to the power-on circuit, the nitrogen filling device is activated to fill the metal tube (5) with nitrogen.

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