Pipeline conveying and connecting device

Abstract

The utility model relates to the technical field of pipe fitting welding, in particular to a pipeline conveying connecting device which comprises an external expansion piece, a hollow conveying rod and an anti-loosening piece, a limiting structure is arranged at the end of the conveying rod, the external expansion piece is arranged outside the conveying rod in a sleeved mode and movably connected with the conveying rod, and an elastic expansion claw is arranged at the end, close to the limiting structure, of the external expansion piece. The conveying rod is sleeved with the anti-loosening piece, the anti-loosening piece is in threaded connection with the conveying rod, the end of the anti-loosening piece further abuts against the end of the external expansion piece, and when the external expansion piece moves to the elastic expansion claw and is opened by the limiting structure, the anti-loosening piece is in a first state; and when the external expansion piece moves back until the elastic expansion claw is separated from the limiting structure, the elastic expansion claw shrinks and restores, and is in a second state. The utility model aims to overcome the defects in the prior art, provides the pipeline conveying and connecting device, ensures that the connection is not loosened in the welding process of a workpiece, and ensures the supply of the protective gas as the protective gas is stably introduced into the workpiece through the conveying rod.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe welding, and more specifically, to a pipeline transportation connection device. Background Art

[0002] The manufacturing of stainless steel pipe fittings requires processes such as pipe slitting, forming, welding, airtightness testing, polishing, cleaning and packaging. The quality of welding is directly related to whether there are defects such as burn-through, porosity, slag inclusion, etc. in the weld, and affects the mechanical properties and structural safety of the pipe.

[0003] The quality of the weld determines the overall strength of the pipe fitting, and the quality of the weld is affected by many factors, including: the professional level of the welder, the performance of the welding equipment or welding machine, the consistency of the metal elements of the weld base material and the welded pipe fitting, the presence of impurities, the selection of welding process, and the influence of environmental factors. Among them, welding equipment and metal materials can be improved by changing the performance of the equipment and materials, while the welding process is relatively fixed. Generally, the welding of stainless steel pipe fittings adopts the argon arc welding process. During welding, argon gas is used as a shielding gas to cover the welded area. In current actual operations, the welder directly inserts the shielding gas pipe into the welded workpiece. To prevent the pipe from falling, a circle of masking paper is also wrapped around the surface of the pipe inserted into the workpiece to prevent loose connection during welding, resulting in a loose connection between the pipe and the pipe or the pipe falling, resulting in a black weld inside the workpiece, that is, the welding process is not protected by the welding gas, which may cause defects such as burn-through and porosity, increasing the risk of leakage. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art in which the connection between the pipe and the air pipe is not firm or the air pipe falls off during welding, resulting in poor welding quality. A pipeline conveying connection device is provided, which is connected to the end of the workpiece to ensure that the connection of the workpiece will not loosen during the welding process. The shielding gas is stably introduced into the workpiece through the conveying rod to ensure the supply of shielding gas.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A pipeline conveying connection device is provided, comprising an external expansion piece, an internally hollow conveying rod and an anti-loosening piece, wherein a limiting structure is provided at the end of the conveying rod, the external expansion piece is sleeved on the outside of the conveying rod and is movably connected to the conveying rod, and an elastic expansion claw is provided at the end of the external expansion piece close to the limiting structure, the anti-loosening piece is sleeved on the outside of the conveying rod and is threadedly connected to the conveying rod, and the anti-loosening piece abuts against the external expansion piece, when the external expansion piece moves to the point where the elastic expansion claw is stretched open by the limiting structure, it is in a first state; when the external expansion piece moves back to the point where the elastic expansion claw is separated from the limiting structure, the elastic expansion claw contracts and recovers, which is a second state.

[0007] When shielding gas needs to be supplied for workpiece welding, the operator first rotates the anti-loosening part in the direction away from the elastic expansion claw, and then manually moves the external expansion part to make it move relative to the conveying rod in the direction close to the anti-loosening part. At this time, the limiting structure protrudes from the external expansion part, and the elastic expansion claw is separated from the limiting structure. The utility model is in the second state; the operator inserts the limiting structure end of the pipeline conveying connection device in the second state into the workpiece, and moves the external expansion part to move it until the elastic expansion claw is stretched open by the limiting structure, and rotates the anti-loosening part to make the anti-loosening part abut against the end of the external expansion part. The utility model is in the first state. At this time, the stretched elastic expansion claw abuts against the inner wall of the workpiece, ensuring that the connection of the workpiece will not loosen during the welding process, and the shielding gas is stably passed into the workpiece by the conveying rod to ensure the supply of shielding gas.

[0008] Preferably, the outer diameter of the limiting structure away from the end of the outer expansion piece is larger than the outer diameter of the limit structure close to the end of the outer expansion piece.

[0009] Preferably, the elastic expansion claw is provided with a plurality of strip grooves, and the plurality of strip grooves are all arranged along the axial direction.

[0010] Preferably, a circular hole is formed at the end of the strip groove close to the anti-loosening member.

[0011] Preferably, a conical surface section is provided inside the end of the elastic expansion claw away from the anti-loosening member, and the inner diameter of the end of the conical surface section away from the anti-loosening member is larger than the inner diameter of the end close to the anti-loosening member.

[0012] Preferably, it also includes an elastic part, which is sleeved on the outside of the conveying rod. The inner side of the end of the outward expansion part close to the anti-loosening part is provided with a groove around the conveying rod. One end of the elastic part abuts against the inner wall of the groove, and the other end abuts against the anti-loosening part.

[0013] Preferably, a restraining sleeve is further included, which is arranged outside the conveying rod, and one end of the restraining sleeve abuts against the elastic member, and the other end abuts against the anti-loosening member.

[0014] Preferably, the end of the outer expansion piece where the elastic expansion claw is provided is provided with a limiting step.

[0015] Preferably, a rotary joint is further included, which is installed at the end of the conveying rod away from the limiting structure and is detachably connected to the conveying rod.

[0016] Preferably, the end of the rotary joint away from the delivery rod is plugged into the air inlet pipe.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] (1) The external expansion member of the present invention is provided with an elastic expansion claw. In the first state, the anti-loosening member abuts against the external expansion member to ensure that the external expansion member does not slide. The elastic expansion claw contacts the limiting structure and the elastic expansion claw opens to abut against the inner wall of the workpiece to ensure the stability of the connection.

[0019] (2) The utility model is provided with a rotary joint, and the air inlet pipe for supplying protective gas is plugged into the rotary joint, which can effectively prevent the air inlet pipe from being entangled during welding, ensuring that the protective gas can be stably supplied, thereby ensuring the welding quality of the workpiece.

[0020] (3) The utility model is provided with an elastic member and an anti-loosening member, and the output force of the elastic member can be changed by adjusting the position of the anti-loosening member relative to the conveying rod, thereby adjusting the locking force of the elastic expansion claw. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a pipeline transportation connection device according to the utility model in a first state and a first viewing angle;

[0022] Figure 2 This is a schematic structural diagram of a pipeline transportation connection device according to the present invention in a first state and a second viewing angle;

[0023] Figure 3 for Figure 2 BB cross-sectional view;

[0024] Figure 4 This is a schematic structural diagram of a pipeline transportation connection device equipped with a rotary joint in the second state from a first perspective of the present invention;

[0025] Figure 5 This is a schematic structural diagram of a pipeline transportation connection device equipped with a rotary joint in a second state and a second viewing angle of the present invention;

[0026] Figure 6 for Figure 5 AA cross-sectional view.

[0027] The icon markings are explained as follows:

[0028] 1. External expansion piece; 11. Elastic expansion claw; 111. Conical surface section; 12. Strip groove; 13. Round hole; 14. Groove; 15. Limiting step; 2. Conveying rod; 21. Limiting structure; 22. Conveying pipeline; 3. Anti-loosening piece; 4. Elastic piece; 41. Constraint sleeve; 5. Rotary joint; 6. Inlet pipe. DETAILED DESCRIPTION

[0029] The present utility model will be further described below in conjunction with specific embodiments. Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation of this patent; in order to better illustrate the embodiments of the present utility model, some components in the drawings will be omitted, enlarged or reduced, and do not represent the dimensions of actual products; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0030] In the drawings of the embodiments of the present utility model, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and should not be construed as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] Embodiment 1

[0032] As Figures 1 to 3The figure shows a first embodiment of a pipeline conveying connection device of the present invention, comprising an external expansion member 1, an internally hollow conveying rod 2 and an anti-loosening member 3. A limiting structure 21 is provided at the end of the conveying rod 2. The external expansion member 1 is sleeved on the outside of the conveying rod 2 and is movably connected to the conveying rod 2. An elastic expansion claw 11 is provided at the end of the external expansion member 1 close to the limiting structure 21. The anti-loosening member 3 is sleeved on the outside of the conveying rod 2 and is threadedly connected to the conveying rod 2. The anti-loosening member 3 abuts against the external expansion member 1. When the external expansion member 1 moves to the point where the elastic expansion claw 11 is stretched open by the limiting structure 21, it is in the first state; when the external expansion member 1 moves back to the point where the elastic expansion claw 11 is separated from the limiting structure 21, the elastic expansion claw 11 contracts and recovers, which is the second state. When shielding gas needs to be supplied to the workpiece welding, the operator first rotates the anti-loosening part 3 in the direction away from the elastic expansion claw 11, and then uses his hand to move the outer expansion part 1 so that it moves relative to the conveying rod 2 in the direction close to the anti-loosening part 3. At this time, the limiting structure 21 protrudes from the outer expansion part 1, and the elastic expansion claw 11 is separated from the limiting structure 21. The utility model is in the second state; the operator inserts the limiting structure 21 end of the pipeline conveying connection device in the second state into the workpiece, and moves the outer expansion part 1 to move it until the elastic expansion claw 11 is stretched open by the limiting structure 21, and adjusts the anti-loosening part 3 so that the anti-loosening part 3 abuts against the end of the outer expansion part 1. The utility model is in the first state. At this time, the stretched elastic expansion claw 11 abuts against the inner wall of the workpiece, ensuring that the connection of the workpiece will not loosen during the welding process, and the shielding gas is stably passed into the workpiece by the conveying rod 2 to ensure the supply of shielding gas. A delivery pipe 22 is provided in the hollow interior of the delivery rod 2, and the shielding gas can be delivered to the workpiece through the delivery pipe 22. The external expansion part 1 ensures that the connection of the workpiece will not loosen during the welding process, thereby ensuring the supply of shielding gas. The end of the rotary joint 5 away from the delivery rod 2 is plugged into the air inlet pipe 6, and the air inlet pipe 6 outputs the shielding gas. The shielding gas is input by the air inlet pipe 6, flows through the delivery pipe 22, and is output from the end of the delivery rod 2 away from the anti-loosening part 3, and the shielding gas is passed into the workpiece. The use of shielding gas is an important measure to ensure welding quality, improve production efficiency and the safety of operators.

[0033] The outer diameter of the limiting structure 21 of the present utility model, which is far from the end of the outward expansion member 11, is larger than the outer diameter of the part near the end of the outward expansion member 1. When the outward expansion member 1 drives the elastic expansion claws 11 to move away from the anti-loosening member 3, the elastic expansion claws 11 cooperate with the limiting structure 21 to deform and are gradually expanded, and then abut against the inner wall of the workpiece, ensuring that the connection is not easily loosened and preventing the generation of defective products caused by insufficient protective gas. Inside the end of the elastic expansion claw 11 far from the anti-loosening member 3, there is a conical surface section 111. The inner diameter of the end of the conical surface section 111 far from the anti-loosening member 3 is larger than the inner diameter of the end near the anti-loosening member 3. The conical surface section 111 of the elastic expansion claw 11 can ensure better cooperation between the elastic expansion claw 11 and the limiting structure 21. Thus, when using the present utility model to convey the protective gas, it can ensure that the workpiece can obtain a stable and continuous supply of protective gas, prevent welding interruption caused by problems with the protective gas, reduce rework and repair caused by welding defects, reduce the post-treatment cost, and improve production efficiency.

[0034] A number of strip-shaped grooves 12 are provided on the elastic expansion claws 11 of the present utility model. The number of strip-shaped grooves 12 are all axially arranged. The design of the strip-shaped grooves 12 helps to reduce the difficulty of the opening and contraction of the elastic expansion claws 11 during the processing. Further, circular holes 13 are provided at the ends of the strip-shaped grooves 12 close to the anti-loosening member 3, which can release the stress generated during the bending deformation of the elastic expansion claws 11, that is, prevent cracks from occurring at the ends of the strip-shaped grooves 12 due to the repeated opening and contraction of the elastic expansion claws 11.

[0035] The present utility model further includes an elastic member 4. The elastic member 4 is sleeved outside the conveying rod 2. A groove 14 is provided around the conveying rod 2 on the inner side of the end of the outward expansion member 1 close to the anti-loosening member 3. One end of the elastic member 4 abuts against the inner wall of the groove 14, and the other end abuts against the anti-loosening member 3. The groove 14 ensures that the elastic member 4 will not fall off during use. The cooperation between the elastic member 4 and the anti-loosening member 3 ensures that the outward expansion member 1 will not easily loosen during use, preventing the generation of defective products. In this embodiment, the elastic member 4 is selected as a compression spring, and the anti-loosening member 3 is an adjusting nut. The anti-loosening member 3 is threadedly connected to the conveying rod 2. The compression degree of the elastic member 4 can be controlled by rotating the anti-loosening member 3, that is, controlling the output force of the elastic member 4, so as to adjust the locking force of the elastic expansion claws 11. The threaded connection allows precise adjustment of the distance and position between components, which helps to accurately control.

[0036] The outer expansion piece 1 of the present invention is provided with an elastic expansion claw 11, and the end thereof is provided with a limiting step 15. When the utility model is used to deliver shielding gas to the workpiece, the limiting step 15 is abutted against the end of the workpiece. When in use, the operator only needs to abut the limiting step 15 against the end of the workpiece to know that the connection is complete. In addition, this design can also prevent the leakage of shielding gas to a certain extent, ensure the stability and continuity of shielding gas during welding, help to form high-quality and uniform welds, and enhance the mechanical properties of the workpiece. The material of the outer expansion piece of this embodiment is spring steel. Spring steel can return to its original shape after bending, compression or extension. This elastic property is important for the elastic expansion claw 11, ensuring the reliability and durability of the elastic expansion claw 11 in repeated use. Spring steel has high fatigue strength. The elastic expansion claw 11 must expand and contract each time it is disassembled and connected. The use of spring steel is not prone to fatigue damage. The use of spring steel in the outer expansion piece 1 of this embodiment does not mean that only spring steel can be used.

[0037] Example 2

[0038] like Figure 3 The second embodiment of a pipeline conveying connection device of the present invention is shown. This embodiment is similar to the first embodiment, except that it also includes a constraint sleeve 41. The constraint sleeve 41 is sleeved on the outside of the conveying rod 2, and one end of the constraint sleeve 41 abuts against the elastic member 4, and the other end abuts against the anti-loosening member 3. One side of the constraint sleeve 41 abuts against the inner wall of the groove 14 of the outer expansion member 1, and the other side abuts against the conveying rod 2. The constraint sleeve 41 helps to correctly install the elastic member 4, and at the same time can ensure that the elastic member 4 does not swing significantly during use of the present invention, that is, prevents the elastic member 4 from being displaced and sliding out of the groove 14. In addition, the constraint sleeve 41 can avoid excessive expansion and contraction of the elastic member 4 during use, maintain its performance, and reduce the risk of performance degradation of the elastic member 4 due to excessive use.

[0039] The material of the elastic member 4 of this embodiment is spring steel. Spring steel can return to its original shape after bending, compression or extension. This elastic property is crucial for the elastic member 4 to ensure its reliability and durability in repeated use. At the same time, spring steel has high fatigue strength, ensuring that the elastic member 4 can withstand repeated loads without being prone to fatigue damage. The selection of spring steel as the material of the elastic member 4 of this embodiment does not mean that only spring steel can be selected. Materials such as stainless steel or polymer materials can also be selected. The selection should be based on factors such as working conditions and cost.

[0040] Example 3

[0041] like Figures 4 to 6The third embodiment of a pipeline conveying and connecting device of the present utility model is shown. This embodiment is similar to Embodiment 1, except that it further includes a rotary joint 5 and an air inlet pipe 6. The rotary joint 5 is installed at the end of the conveying rod 2 away from the limiting structure 21 and is detachably connected to the inside of the conveying rod 2. The air inlet pipe 6 is inserted into the end of the rotary joint 5 away from the conveying rod 2. The rotary joint 5 can transfer the medium from the static system to the dynamic rotating system, realizing the continuous rotation movement while conducting the medium transfer. Applied to the present utility model, it can convey the shielding gas from the static air inlet pipe 6 to the dynamically rotating workpiece. During welding, the workpiece rotates, and the rotary joint 5 can prevent the air pipe from winding, ensuring the smooth conveyance of the shielding gas and avoiding affecting the supply of the shielding gas. Moreover, the sealing structure of the rotary joint 5 can ensure that no gas leakage occurs during the rotation movement, thus maintaining the airtightness of the welding environment. And the installation and maintenance of the rotary joint 5 are relatively simple, and it can be maintained and replaced without stopping the entire welding system, improving work efficiency.

[0042] In this embodiment, the rotary joint 5 and the end of the conveying rod 2 are connected by threads. Threaded connection allows multiple disassembly and reassembly without losing the integrity of the connection. Moreover, threaded connection is easy to install and does not require complex fixing equipment. If the fit between the threads is not tight, it may cause leakage of the shielding gas. The solution is to apply an appropriate amount of sealant, such as thread sealant, to the threads to fill the tiny gaps between the threads and form a barrier to prevent the leakage of the shielding gas. The threads may be affected by wear or deformation during use, which may affect their sealing performance. This can be solved by checking whether there are scratches, cracks or deformations on the surface of the connector and repairing or replacing it if necessary. When the components connected by threads need to be repaired or replaced, they can be quickly disassembled and reassembled. The fact that the rotary joint 5 and the end of the conveying rod 2 are connected by threads in this embodiment does not mean that only threaded connection can be used. Push-in pipe inserts or compression tube fittings can also be used instead, which are selected according to specific requirements, cost-benefit analysis and operating environment.

[0043] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model and are not limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A pipeline transportation connection device, characterized in that: The invention comprises an outer expansion member (1), an inner hollow conveying rod (2) and an anti-loosening member (3); a limiting structure (21) is provided at the end of the conveying rod (2); the outer expansion member (1) is sleeved on the outside of the conveying rod (2) and is movably connected to the conveying rod (2); and an elastic expansion claw (11) is provided at the end of the outer expansion member (1) close to the limiting structure (21); the anti-loosening member (3) is sleeved on the outside of the conveying rod (2) and is threadedly connected to the conveying rod (2); and the anti-loosening member (3) is also in contact with the outer expansion member (1); when the outer expansion member (1) moves to the elastic expansion claw (11) and is stretched open by the limiting structure (21), it is in the first state; when the outer expansion member (1) moves back to the elastic expansion claw (11) and is separated from the limiting structure (21), the elastic expansion claw (11) contracts and recovers, which is the second state.

2. The pipeline transportation connection device according to claim 1, characterized in that: The outer diameter of the limiting structure (21) away from the end of the outer expansion piece (1) is larger than the outer diameter of the end close to the outer expansion piece (1).

3. The pipeline transportation connection device according to claim 1, characterized in that: The elastic expansion claw (11) is provided with a plurality of strip grooves (12), and the plurality of strip grooves (12) are all arranged along the axial direction.

4. The pipeline transportation connection device according to claim 3, characterized in that: A circular hole (13) is formed at the end of the strip-shaped groove (12) close to the anti-loosening member (3).

5. The pipeline transportation connection device according to claim 1, characterized in that: A conical section (111) is provided inside the end of the elastic expansion claw (11) away from the anti-loosening part (3), and the inner diameter of the end of the conical section (111) away from the anti-loosening part (3) is larger than the inner diameter of the end close to the anti-loosening part (3).

6. The pipeline transportation connection device according to claim 1, characterized in that: It also includes an elastic member (4), which is sleeved on the outside of the conveying rod (2). The inner side of the end of the outer expansion member (1) close to the anti-loosening member (3) is provided with a groove (14) surrounding the conveying rod (2). One end of the elastic member (4) abuts against the inner wall of the groove (14), and the other end abuts against the anti-loosening member (3).

7. The pipeline transportation connection device according to claim 6, characterized in that: It also includes a restraining sleeve (41), which is sleeved outside the conveying rod (2), and one end of the restraining sleeve (41) abuts against the elastic member (4), and the other end abuts against the anti-loosening member (3).

8. The pipeline transportation connection device according to claim 1, characterized in that, The end of the elastic expansion claw (11) of the external expansion piece (1) is provided with a limiting step (15).

9. The pipeline transportation connection device according to claim 1, characterized in that: It also includes a rotary joint (5), which is installed at the end of the conveying rod (2) away from the limiting structure (21) and is detachably connected to the conveying rod (2).

10. The pipeline transportation connection device according to claim 9, characterized in that: The end of the rotary joint (5) away from the delivery rod (2) is plugged into the air inlet pipe (6).

Images