A welding structure, flexible pipe and manufacturing process

Abstract

The present invention provides a welding structure, a flexible pipe and a manufacturing process, wherein the welding structure comprises: a pipe body; a connector, which is sleeved on the outside of the pipe body, and the inner side of the connector has a welding portion for welding the pipe body and the connector. Since the welding surface is located inside the welding portion and the pipe body, no turning process is required after welding. Compared with the prior art, the processing steps are reduced, the production efficiency is greatly improved, and during welding, the positioning structure for positioning the position between the connector and the pipe body is reduced, thereby reducing the production cost.

Description

Technical Field

[0001] The invention relates to the technical field of flexible pipes, and in particular to a welding structure, a flexible pipe and a manufacturing process. Background Art

[0002] Stainless steel explosion-proof flexible pipes are mainly used in places with explosive mixtures such as mines and gas. They are used as the inlet and outlet connections of explosion-proof electrical equipment and have the advantages of flame resistance, corrosion resistance and high reliability.

[0003] In the prior art, the structure of the stainless steel explosion-proof flexible pipe is as follows Figure 6 As shown, from left to right are the joint 01, the nut 02 threadedly connected to the joint 01, the inner sleeve 03, and the bellows 04. The ends of the bellows 04 are respectively sleeved with the mesh sleeve 05 and the outer sleeve 06 from the inside to the outside. The end of the inner sleeve 03 close to the joint 01 is formed with a step 031 that cooperates with the nut 02, and the other end is welded to the ends of the bellows 04, the mesh sleeve 05, and the outer sleeve 06.

[0004] During welding, the operator uses welding wire to weld a circle around the connection between the inner sleeve 03 and the corrugated tube 04, the mesh sleeve 05, and the outer sleeve 06. After the welding is completed, since the welding surface 07 at the connection is uneven and the surfaces of the inner sleeve 03 and the outer sleeve 06 near the connection are discolored, turning and grinding and polishing are required to make the product look beautiful. However, the turning process has high technical requirements for the workers. If they are not careful, the welding surface 07 is easily damaged, resulting in the need for re-welding; the above-mentioned processing procedures are complicated and difficult to process, which reduces work efficiency; in addition, since the outer diameter of the nut 02 is smaller than the outer diameter of the outer sleeve 06, before welding, the inner sleeve 03 needs to be sleeved with the nut 02. In order to prevent the nut 02 from moving along the outer wall of the inner sleeve 03, thereby affecting the welding, the length of the inner sleeve 03 needs to be set longer, which increases the production cost. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the flexible pipe in the prior art, such as complex processing procedures, great processing difficulty and high production cost, so as to provide a welding structure with simple manufacturing procedures and high work efficiency, a flexible pipe provided with the welding structure, and a process for manufacturing the flexible pipe.

[0006] To this end, the present invention provides a welding structure, comprising:

[0007] tube body;

[0008] The connecting piece is sleeved on the outer side of the tube body, and the inner side of the connecting piece is provided with a welding portion for welding the tube body and the connecting piece.

[0009] As a preferred solution, the welding portion is L-shaped, and forms a receiving groove with the inner side wall of the connecting piece, and the tube body and the connecting piece are welded at the receiving groove.

[0010] As a preferred solution, it also includes a welding rod arranged in the accommodating groove.

[0011] As a preferred solution, the welding portion and the connecting piece are formed integrally.

[0012] A flexible pipe comprises a joint assembly and the welding structure as described above, wherein the joint assembly is cooperatively connected with the connecting piece.

[0013] As a preferred embodiment, the joint assembly includes a socket member sleeved on the connecting member, one end of the socket member has an opening, the side wall of the opening is formed with a first step extending toward the opening side, and the outer wall of the connecting member is formed with a second step extending toward the outside of the connecting member and adapted to the first step.

[0014] As a preferred solution, a mesh sleeve is further provided between the outer wall of the tube body and the inner wall of the connecting piece, and the mesh sleeve extends along the length direction of the tube body.

[0015] As a preferred solution, the tube body is a corrugated tube, and the materials of the corrugated tube, the connecting piece and the mesh sleeve are all stainless steel.

[0016] A process for manufacturing a flexible pipe comprises the following steps:

[0017] S1, placing the welding rod in the receiving groove;

[0018] S2, the mesh sleeve and the connecting piece are sequentially sleeved on the pipe body, the flexible pipe to be welded passes through the induction coil of the high-frequency induction heating device, the high-frequency induction heating device is turned on to melt the welding rod, and at the same time, the mesh sleeve and the pipe body are pressed down toward the inner groove of the accommodating groove;

[0019] S3, turn off the high-frequency induction heating equipment, and after the welding rod melts and cools, weld the connector, mesh sleeve, and pipe body together;

[0020] S4, connect the connecting piece to the joint assembly.

[0021] As a preferred solution, before step S4, the method further includes polishing the discolored portion of the outer wall of the connecting piece, and pressing the connecting piece, the mesh sleeve, and the tube body into one body.

[0022] The technical solution of the present invention has the following advantages:

[0023] 1. The welding structure provided by the present invention comprises a tube body and a connecting piece sleeved on the outside of the tube body, and the inner side of the connecting piece has a welding portion for welding the tube body and the connecting piece. Since the welding surface is located inside the welding portion and the tube body, no turning process is required after welding. Compared with the prior art, the number of processing steps is reduced, which greatly improves the production efficiency. In addition, the use of a positioning structure for positioning the position between the connecting piece and the tube body is reduced during welding.

[0024] 2. The welding structure provided by the present invention has an L-shaped welding portion, which forms a receiving groove with the inner side wall of the connecting piece, and the pipe body and the connecting piece are welded at the receiving groove. The L-shaped welding portion increases the welding area between the connecting piece and the pipe body, and the welding is more firm.

[0025] 3. The welding structure provided by the present invention also includes a welding rod arranged in the receiving groove. Since a vertical welding method is adopted, the melted welding rod will not flow out of the receiving groove during welding, so there is no need to reprocess the melted welding rod. In addition, while ensuring that the connecting parts and the welding rod are fully welded, the use of the welding rod is reduced, further saving production costs.

[0026] 4. In the welding structure provided by the present invention, the welding part and the connecting piece are integrally formed, the processing is quick and convenient, and the production efficiency is improved.

[0027] 5. The flexible pipe provided by the present invention has a joint assembly including a sleeve member sleeved on a connector, one end of the sleeve member has an opening, a side wall at the opening is formed with a first step extending toward the opening, and an outer wall of the connector is formed with a second step extending toward the outside of the connector and matching the first step. Since the second step is integrally formed with the connector, compared with the prior art that requires an inner sleeve connected to the sleeve member, the structure is simpler and the production cost is low. Moreover, during welding, the sleeve member can move along the outer wall of the pipe body without interfering with welding, making welding more convenient.

[0028] 6. The flexible tube provided by the present invention has a mesh sleeve disposed between the outer wall of the tube body and the inner wall of the connector. The mesh sleeve extends along the length direction of the tube body and is used to protect the tube body, thereby extending the service life of the flexible tube.

[0029] 7. The flexible tube provided by the present invention adopts a vertical welding method. After the flexible tube to be welded passes through the induction coil of the high-frequency induction heating equipment, it is placed vertically on a workbench, and the high-frequency induction heating equipment is turned on to melt the welding rod. At the same time, the mesh sleeve and the tube body are pressed down in the groove direction of the accommodating groove; the high-frequency induction heating method is used for welding, which is quick and convenient and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a schematic structural diagram of the flexible pipe of the present invention;

[0032] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of part A;

[0033] Figure 3 is a schematic diagram of the structure of the connecting piece;

[0034] Figure 4 It is a schematic diagram of the structure of the flexible pipe of the present invention during welding;

[0035] Figure 5 for Figure 4 The middle B part is a large-scale structural diagram;

[0036] Figure 6 It is a schematic diagram of the structure of a flexible pipe in the prior art.

[0037] Description of reference numerals: 01, joint; 02, nut; 03, inner sleeve; 031, step; 04, bellows; 05, mesh sleeve; 06, outer sleeve; 07, welding surface;

[0038] 1. Tube body; 2. Connecting piece; 21. Welding part; 22. Accommodating groove; 23. Welding rod; 24. Second step; 3. Mesh sleeve; 4. Socket; 41. First step; 5. Connecting flange; 6. High-frequency induction heating equipment; 61. Induction coil; 62. Workbench. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] Example 1

[0044] This embodiment provides a welding structure such as Figure 1-5 As shown, it includes a tube body 1 and a connector 2 sleeved on the outside of the tube body 1. There are two connectors 2, which are respectively arranged at both ends of the tube body 1. The inner side of the connector 2 has a welding portion 21 for welding the tube body 1 to the connector 2.

[0045] like Figure 2 As shown, the welding portion 21 is L-shaped and forms a receiving groove 22 with the inner wall of the connecting member 2. The tube body 1 and the connecting member 2 are welded at the receiving groove 22. The welding portion 21 and the tube body 1 can be welded by fusion welding.

[0046] The welding rod 23 is also provided in the receiving groove 22. The welding rod 23 is an annular structure and is made of copper.

[0047] like Figure 3 As shown, the welding portion 21 is integrally formed with the connecting member 2, and the welding portion 21 is formed at the end of the connecting member 2. In this embodiment, the welding portion 21 can also be connected to the connecting member 2 by welding.

[0048] In the welding structure of this embodiment, since the welding surface is located inside the welding portion and the tube body, no turning process is required after welding is completed, the number of processing steps is small, and the welding efficiency is high.

[0049] Example 2

[0050] This embodiment provides a flexible pipe, including a joint assembly and a welding structure as shown in Embodiment 1, wherein the joint assembly is cooperatively connected with the connecting piece 2.

[0051] The joint assembly includes a socket 4 sleeved on the connector 2, one end of the socket 4 has an opening, the side wall of the opening is formed with a first step 41 extending toward the opening side, and the outer wall of the connector 2 is formed with a second step 24 extending toward the outside of the connector 2 and adapted to the first step 41.

[0052] In this embodiment, the socket 4 is a nut. After one end of the nut is socketed with the socket, the other end is screwed to the connecting flange 5. The connecting flange 5 is used to be fixedly connected to the connecting flange 5 of another flexible pipe or connecting equipment.

[0053] As a convertible implementation, an external thread is formed on the outer wall of one end of the connecting member 2, and the sleeve member 4 is a nut threadedly connected with the external thread of the connecting member 2.

[0054] A mesh sleeve 3 is further provided between the outer wall of the tube body 1 and the inner wall of the connecting piece 2 , and the mesh sleeve 3 extends along the length direction of the tube body 1 .

[0055] In this embodiment, the tube body 1 is a corrugated tube, and the materials of the corrugated tube, the connecting piece 2, and the mesh sleeve 3 are all made of stainless steel.

[0056] The process for manufacturing the flexible pipe of this embodiment includes the following steps:

[0057] S1, placing the welding rod 23 in the receiving groove 22;

[0058] S2, the mesh sleeve 3 and the connector 2 are sequentially sleeved on the pipe body 1, and the flexible pipe to be welded is used as follows Figure 4 and 5 The vertical welding method shown is placed on a workbench 62 after passing through the induction coil 61 of the high-frequency induction heating device 6, and the high-frequency induction heating device 6 is turned on to melt the welding rod, and at the same time, the mesh sleeve 3 and the tube body 1 are pressed down toward the groove of the receiving groove 22;

[0059] S3, turn off the high-frequency induction heating device 6, and after the welding rod is melted and cooled, weld the connector 2, the mesh sleeve 3, and the pipe body 1 together;

[0060] S4, connecting the connecting piece 2 to the joint assembly.

[0061] Before step S4, the method also includes polishing the discolored portion of the outer wall of the connecting piece 2, and buckling and pressing the connecting piece 2, the mesh sleeve 3, and the tube body 1 into one body to make the connection between the three more firmly.

[0062] The vertical welding method can prevent the melted welding rod 23 from flowing out of the accommodating groove 22 .

[0063] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled 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 list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A welding structure, characterized in that: include: tube body(1); A connecting piece (2) is sleeved on the outside of the tube body (1), and the inside of the connecting piece (2) has a welding portion (21) for welding the tube body (1) and the connecting piece (2), the welding portion (21) is L-shaped and forms a receiving groove (22) with the inner wall of the connecting piece (2), the tube body (1) and the connecting piece (2) are welded at the receiving groove (22), a welding rod (23) is arranged in the receiving groove (22), and the welding rod (23) is an annular structure.

2. The welding structure according to claim 1, characterized in that: The welding portion (21) and the connecting piece (2) are integrally formed.

3. A flexible tube, characterized in that: It comprises a joint assembly and a welding structure as claimed in claim 1 or 2, wherein the joint assembly is cooperatively connected with the connecting piece (2).

4. The flexible pipe according to claim 3, characterized in that: The joint assembly comprises a sleeve member (4) sleeved on the connecting member (2), one end of the sleeve member (4) having an opening, a side wall of the opening being formed with a first step (41) extending towards the opening, and an outer wall of the connecting member (2) being formed with a second step (24) extending towards the outside of the connecting member (2) and matching the first step (41).

5. The flexible pipe according to claim 4, characterized in that: A mesh sleeve (3) is further provided between the outer wall of the tube body (1) and the inner wall of the connecting piece (2), and the mesh sleeve (3) extends along the length direction of the tube body (1).

6. The flexible pipe according to claim 5, characterized in that: The tube body (1) is a corrugated tube, and the materials of the corrugated tube, the connecting piece (2) and the mesh sleeve (3) are all stainless steel.

7. A process for manufacturing a flexible pipe, used for processing a flexible pipe comprising the welded structure according to claim 1 or 2, characterized in that: The steps include: S1, placing a welding rod (23) in a receiving groove (22); S2, sequentially sleeve the mesh sleeve (3) and the connecting piece (2) onto the pipe body (1), heat and melt the welding rod, and at the same time, press the mesh sleeve (3) and the pipe body (1) into the groove direction of the receiving groove (22); S3, stopping heating the welding rod, and after the welding rod is melted and cooled, welding the connecting piece (2), the mesh sleeve (3), and the pipe body (1) together; S4, connect the connecting piece (2) to the joint assembly.

8. The process for manufacturing a flexible pipe according to claim 7, characterized in that: Before step S4, the method further includes polishing the discolored portion of the outer wall of the connecting piece (2), and buckling and pressing the connecting piece (2), the mesh sleeve (3), and the tube body (1) into one body.

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