Corrosion-resistant pipe fitting and clamping device for surfacing

Abstract

The utility model discloses a corrosion-resistant pipe fitting and a clamping device for surfacing welding, and relates to the technical field of pipe fitting machining, the corrosion-resistant pipe fitting and the clamping device for surfacing welding comprise a positioning mechanism connected with a surfacing welding machine, and the positioning mechanism comprises a box body connected to the surfacing welding machine through a mandrel; the fixed seat is fixed in the box body; the movable seat is movably arranged in the box body through a driving mechanism, the movable seat is matched with the fixed seat, and the pipe fitting can be clamped, so that a cosmetic welding layer, a filling welding layer, a transition welding layer, a backing welding layer and a surfacing layer can be sequentially surfaced on the pipe fitting by the surfacing welding machine. The corrosion-resistant pipe fitting is high in corrosion resistance.

Description

Technical Field

[0001] The present application relates to the technical field of pipe fitting processing, and in particular to a corrosion-resistant pipe fitting and a clamping device for surfacing. Background Art

[0002] Tees or crosses used in oil and gas field transportation are usually welded from short pipes. In highly corrosive environments, extremely high corrosion resistance is required for the inner wall of the pipes. Currently, the structure of pipes has a single layer, so they are easily damaged in corrosive environments.

[0003] In order to meet the requirements of pipe fittings used in corrosive environments, it is necessary to weld a corrosion-resistant coating on the inner wall of the pipe fittings.

[0004] The corrosion-resistant coating is welded on the inner wall of the pipe fitting. During production, the existing welding machine is usually used for welding. The three-jaw chuck of the existing welding machine is large, which can easily cause damage to the pipe fitting when clamping the pipe fitting. Therefore, it is necessary to design a clamping device for welding to clamp the pipe fitting. Utility Model Content

[0005] In view of this, the present application provides a corrosion-resistant pipe fitting and a clamping device for cladding to solve the current technical problems of single pipe fitting structure and pipe fitting being damaged by the clamping device.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A corrosion-resistant pipe fitting has an inner wall with a cap welding layer, a filling welding layer, a transition welding layer, a base welding layer and a surfacing welding layer which are arranged in sequence.

[0008] The utility model also provides a clamping device for cladding, which is used for clamping the inner wall of a corrosion-resistant pipe during cladding. The clamping device for cladding includes a positioning mechanism connected to a cladding machine, and the positioning mechanism includes:

[0009] A box body connected to the cladding machine via a mandrel;

[0010] A fixing seat fixed in the box;

[0011] The movable seat is movably arranged in the box body through the driving mechanism, and the movable seat cooperates with the fixed seat to clamp the pipe fitting, so that the cladding machine can perform cladding processing on the inside of the pipe fitting.

[0012] Furthermore, at least two symmetrically arranged positioning components are connected to the movable seat, and the lower ends of the positioning components are slidably connected to the fixed seat.

[0013] Furthermore, the positioning component comprises:

[0014] A first guide rod connected to the lower end of the moving seat;

[0015] A piston block connected to the lower end of the first guide rod and slidably matched with the fixing seat;

[0016] A compression spring is connected between the piston block and the fixing seat.

[0017] Furthermore, a plurality of rollers capable of abutting against the fixing seat are symmetrically arranged on the side surface of the piston block.

[0018] Furthermore, the positioning assembly also includes a stopper located above the piston block, and the stopper is arranged on the fixing seat.

[0019] Furthermore, the driving mechanism comprises:

[0020] A rocker assembly movably connected to the box;

[0021] a bevel gear assembly connected to the rocker assembly;

[0022] A screw connected to the bevel gear assembly;

[0023] The movable plate is movably connected to the screw rod via a nut block, and the movable seat is connected to the movable plate.

[0024] Furthermore, the movable plate is also connected to a sliding block which is slidably connected to a second guide rod arranged in the box body.

[0025] Furthermore, the rocker assembly includes a rotating rod and a rocking handle which are integrally connected, the rotating rod is movably connected to the box body, and the rotating rod is connected to the bevel gear assembly.

[0026] Furthermore, the bevel gear assembly includes a first bevel gear and a second bevel gear meshing with each other, the first bevel gear is connected to the rotating rod, and the second bevel gear is connected to the screw rod.

[0027] It can be seen from the above technical solution that the advantages of the utility model are:

[0028] 1. A positioning mechanism is provided in the present application, and the positioning mechanism includes a movable seat and a fixed seat. The movable seat is driven by a driving mechanism so that the movable seat approaches the fixed seat, thereby reliably clamping the pipe fitting.

[0029] 2. In the present application, a positioning assembly is connected between the movable seat and the fixed seat, and the positioning assembly can accurately position the movable seat and the fixed seat, thereby improving the accuracy of installation, making the movable seat and the fixed seat clamp the pipe fittings reliably and avoiding clamping of the pipe fittings.

[0030] 3. In the present application, the pipe fittings are composed of pipe fittings, cladding layers, base weld layers, transition weld layers, filling weld layers and cap weld layers, which not only increase the wall thickness of the pipe fittings, but also enhance the corrosion resistance of the inner wall of the pipe fittings, thereby extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0032] Figure 1 This is a schematic diagram of the structure of the corrosion-resistant pipe fittings of this application.

[0033] Figure 2 This is a schematic structural diagram of the connection relationship between the clamping device and the cladding machine of the present application.

[0034] Figure 3 for Figure 2 AA section view.

[0035] Figure 4 for Figure 3 A partial enlarged view of point B.

[0036] Figure 5 for Figure 3 A partial enlarged view of point C.

[0037] Figure 6 for Figure 5 A partial enlarged view of point D.

[0038] Description of reference numerals: 1-mandrel; 2-surfacing machine; 21-three-jaw chuck; 3-positioning mechanism; 31-box; 311-slideway; 312-through hole; 32-moving seat; 321-top block; 322-first guide rod; 323-stopper; 3231-center hole; 324-piston block; 3241-roller; 325-compression spring; 33-fixed seat; 331-accommodating groove; 3311-inner wall; 332-sink; 34-screw rod; 341-nut block; 342-moving plate; 343-bracket; 344-rotating rod; 345-rocker; 346-bevel gear assembly; 3461-first bevel gear; 3462-second bevel gear; 35-second guide rod; 36-sliding block; 4-pipe fitting; 5-protective pad; 6-surfacing layer; 7-bottoming weld layer; 8-transition weld layer; 9-filling weld layer; 10-covering weld layer. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the implementation modes and the accompanying drawings. Here, the illustrative implementation modes and descriptions of the present application are used to explain the present application, but are not intended to limit the present application.

[0040] like Figure 1 As shown, the present embodiment also provides a corrosion-resistant pipe fitting, which is obtained by clamping the pipe fitting 4 with a clamping device for cladding and then performing cladding processing with a cladding machine 2. The cladding machine 2 clads the pipe fitting 4 layer by layer. Specifically, a cap welding layer 10, a filling welding layer 9, a transition welding layer 8, a base welding layer 7 and a cladding layer 6 are sequentially clad on the inner wall of the pipe fitting 4 to improve the corrosion resistance of the pipe fitting 4, so that it can be used for a tee or a cross in oil and gas field transportation.

[0041] refer to Figures 2 to 6 ,like Figure 2 As shown, this embodiment provides a clamping device for cladding, which includes a positioning mechanism 3, which is used to clamp a pipe 4 to install the pipe 4 on a three-jaw chuck 21 of a cladding machine 2, in preparation for the next step of cladding the inner wall of the pipe 4 with a corrosion-resistant coating. A core shaft 1 is installed on the left end face of the positioning mechanism 3, and the core shaft 1 is clamped and fixed by the three-jaw chuck 21 of the cladding machine 2.

[0042] like Figure 2 and Figure 3 As shown, the positioning mechanism 3 includes: a box body 31, a fixed seat 33 and a movable seat 32, the mandrel 1 is fixedly mounted on the left end surface of the box body 31, and a circular opening is provided on the right end surface of the box body 31, the diameter of the opening is larger than the diameter of the pipe 4, and the size of the opening is convenient for the operator to insert his hand, so as to take and place the pipe 4; the fixed seat 33 is fixed on the inner bottom wall of the box body 31; the driving mechanism is installed in the box body 31, the movable seat 32 is located above the fixed seat 33, the movable seat 32 is driven by the driving mechanism, the movable seat 32 is movably arranged in the box body 31, and the driving mechanism drives the movable seat 32 to move up and down, so as to realize the clamping and loosening of the pipe 4 by the movable seat 32 and the fixed seat 33, and the movable seat 32 cooperates with the fixed seat 33 to clamp the pipe 4, so that the surfacing machine 2 can perform surfacing welding on the inner wall of the pipe 4.

[0043] In the embodiment of the present application, protective pads 5 are provided on the curved surfaces of the movable seat 32 and the fixed seat 33 for clamping the pipe 4. The protective pads 5 can not only protect the pipe 4 to prevent it from being clamped, but also play a deforming role when clamping the pipe 4, thereby making the clamping effect better.

[0044] like Figure 3 and Figure 5As shown, two positioning components are symmetrically connected to the bottom of the movable seat 32, and two receiving grooves 331 are symmetrically provided on the fixed seat 33. The lower ends of the positioning components are slidably connected to the corresponding receiving grooves 331. By setting a pair of positioning components, the movable seat 32 can move up and down smoothly, and the accuracy of the upper and lower correspondence between the movable seat 32 and the fixed seat 33 can be improved, so that the clamping position is more accurate, thereby improving the welding accuracy.

[0045] like Figure 5 As shown, the positioning assembly includes: a first guide rod 322, a piston block 324 and a compression spring 325, wherein a top block 321 is installed at the upper end of the first guide rod 322, and the top block 321 is connected to the lower end surface of the movable seat 32. Specifically, the top block 321 is connected to the movable seat 32 by screws to facilitate the disassembly of the first guide rod 322; the piston block 324 is slidably connected with the corresponding receiving groove 331, and the piston block 324 is connected to the lower end of the first guide rod 322, and the first guide rod 322 can extend into the receiving groove 331; the compression spring 325 is received in the receiving groove 331, and the upper end of the compression spring 325 presses against the lower end surface of the piston block 324, and the lower end presses against the bottom wall of the receiving groove 331.

[0046] like Figure 6 As shown, in order to make the piston block 324 move smoothly, a plurality of rollers 3241 are arranged in a ring shape on the outer circumferential surface of the piston block 324. The rollers 3241 are against the inner wall 3311 of the accommodating groove 331. The rollers 3241 can support and limit the piston block 324, so that the piston block 324 can move up and down more smoothly.

[0047] Preferably, the positioning assembly also includes a stopper 323 , a recessed groove 332 is formed through the upper end of the accommodating groove 331 , and the stopper 323 is installed in the corresponding recessed groove 332 . The stopper 323 is located above the piston block 324 , and the diameter of the stopper 323 is greater than the diameter of the piston block 324 .

[0048] Preferably, a center hole 3231 is opened in the middle of the stopper 323 , and the lower end of the first guide rod 322 passes through the center hole 3231 and is connected to the piston block 324 . The center hole 3231 is used to accommodate the first guide rod 322 passing through.

[0049] like Figure 3 and Figure 4As shown, the driving mechanism includes: a rocker assembly, a bevel gear assembly 346, a screw 34 and a moving plate 342, the rocker assembly is movably connected to the through hole 312 of the box body 31; the bevel gear assembly 346 is connected to the rocker assembly; the screw 34 is connected to the bevel gear assembly 346; the moving plate 342 is movably connected to the screw 34 through a nut block 341, and the moving seat 32 is connected to the moving plate 342.

[0050] Preferably, the movable plate 342 is also connected to a sliding block 36, an inner side wall of the box body 31 is provided with a sliding groove 311, a second guide rod 35 is installed in the sliding groove 311, the sliding block 36 is slidably connected with the second guide rod 35, and the sliding block 36 cooperates with the second guide rod 35, so that the sliding block 36 drives the movable plate 342 to move smoothly, thereby making the movable seat 32 move smoothly.

[0051] In the embodiment of the present application, the rocker assembly includes a rotating rod 344 and a rocking handle 345 that are integrally connected. The rotating rod 344 is movably connected to the box body 31, and the rotating rod 344 is connected to the bevel gear assembly 346. Specifically, a bracket 343 is installed in the box body 31, and the rotating rod 344 is rotatably connected to the bracket 343 through a bearing. The support of the bracket 343 can make the rotating rod 344 rotate more smoothly, thereby improving the transmission stability.

[0052] In the embodiment of the present application, the bevel gear assembly 346 includes a first bevel gear 3461 and a second bevel gear 3462 that mesh with each other. The first bevel gear 3461 is connected to the rotating rod 344, and the second bevel gear 3462 is connected to the screw rod 34. The upper and lower ends of the screw rod 34 are connected to the box body 31 through bearing seats to ensure smooth rotation of the screw rod 34.

[0053] Working process: the mandrel 1 is pre-installed on the three-jaw chuck 21 (the axis of the mandrel 1 is coaxial with the axis of the pipe 4). When installing and fixing, the pipe 4 is placed on the fixing seat 33, and the crank 345 is rotated to make the rotating rod 344 drive the second bevel gear 3462 to rotate, and then the second bevel gear 3462 drives the first bevel gear 3461 to rotate, so that the screw rod 34 rotates, and the screw rod 34 is connected to the nut block 341, so that the nut block 341 drives the moving plate 342 to move downward, and the moving plate 342 moves downward. The movable seat 32 is connected to the movable plate 342, so that the movable seat 32 moves downward, thereby clamping the pipe fitting 4 between the movable seat 32 and the fixed seat 33. After the clamping and fixing are completed, the cladding machine 2 is started, and the core shaft 1 drives the clamping device and the pipe fitting 4 to rotate as a whole. The cladding robot of the cladding machine 2 clamps the cladding gun to perform cladding operation on the pipe fitting 4, that is, the cover weld layer 10, the filling weld layer 9, the transition weld layer 8, the base weld layer 7 and the cladding layer 6 are sequentially clad inside the pipe fitting 4 to obtain the corrosion-resistant pipe fitting 4.

[0054] In the embodiment of the present application, the welding process parameters of the surfacing layer 6 are: current 160-200A, voltage 25-29V, welding speed 5-6cm / min; the welding process parameters of the base welding layer 7 are: current 100A, voltage 10V, welding speed 3.63cm / min; the welding process parameters of the transition welding layer 8 are: current 100A, voltage 10V, welding speed 5.48cm / min; the welding process parameters of the filling welding layer 9 and the cover welding layer 10 are both: current 57-60A, voltage 19V, welding speed 7.3cm / min.

[0055] In the embodiment of the present application, the process welding material used for the corrosion-resistant pipe fitting is Hastelloy C276 welding material. By arranging a cover welding layer 10, a filling welding layer 9, a transition welding layer 8, a base welding layer 7 and a surfacing layer 6 on the inner wall of the pipe fitting 4, the overall thickness of the pipe fitting 4 can be increased, and the overall anti-corrosion performance and mechanical properties can be made good, thereby making it stronger and more durable. In addition, the present application uses a positioning component to position and limit the movable seat 32 and the fixed seat 33. Compared with the traditional clamping and fixing method, it can avoid damage to the pipe wall of the pipe fitting 4. In addition, by operating the driving mechanism, the clamping of the pipe fitting 4 can be quickly achieved.

[0056] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the embodiments of the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A corrosion-resistant pipe fitting, characterized in that: The inner wall of the pipe (4) comprises a cap welding layer (10), a filling welding layer (9), a transition welding layer (8), a base welding layer (7) and a cladding layer (6) which are arranged in sequence.

2. A clamping device for cladding of corrosion-resistant pipe fittings as claimed in claim 1, characterized in that: It comprises a positioning mechanism (3) connected to the overlay welding machine (2), wherein the positioning mechanism (3) comprises: A box (31) connected to the cladding machine (2) via a mandrel (1); A fixing seat (33) fixed inside the box (31); A movable seat (32) is movably arranged in the box body (31) through a driving mechanism, and the movable seat (32) cooperates with the fixed seat (33) to clamp the pipe (4), so that the overlay welding machine (2) can perform overlay welding on the inside of the pipe (4).

3. The clamping device for cladding according to claim 2, characterized in that: At least two symmetrically arranged positioning components are connected to the movable seat (32), and the lower ends of the positioning components are slidably connected to the fixed seat (33).

4. The clamping device for cladding according to claim 3, characterized in that: The positioning component comprises: A first guide rod (322) connected to the lower end of the moving seat (32); A piston block (324) connected to the lower end of the first guide rod (322) and slidably engaged with the fixing seat (33); A compression spring (325) connected between the piston block (324) and the fixing seat (33).

5. The clamping device for cladding according to claim 4, characterized in that: A plurality of rollers (3241) capable of abutting against the inside of the fixing seat (33) are symmetrically arranged on the side surface of the piston block (324).

6. The clamping device for cladding according to claim 4, characterized in that: The positioning assembly further comprises a stopper (323) located above the piston block (324), and the stopper (323) is arranged on the fixing seat (33).

7. The clamping device for cladding according to claim 2, characterized in that: The driving mechanism comprises: A rocker assembly movably connected to the box (31); a bevel gear assembly (346) connected to the rocker assembly; A screw rod (34) connected to the bevel gear assembly (346); A movable plate (342) movably connected to the screw rod (34) via a nut block (341), and the movable seat (32) is connected to the movable plate (342).

8. The clamping device for cladding according to claim 7, characterized in that: The movable plate (342) is also connected to a sliding block (36) which is slidably connected to a second guide rod (35) disposed in the box body (31).

9. The clamping device for cladding according to claim 8, characterized in that: The rocker assembly comprises a rotating rod (344) and a rocking handle (345) which are integrally connected, the rotating rod (344) being movably connected to the box body (31), and the rotating rod (344) being connected to the bevel gear assembly (346).

10. The clamping device for cladding according to claim 9, characterized in that: The bevel gear assembly (346) comprises a first bevel gear (3461) and a second bevel gear (3462) which mesh with each other, the first bevel gear (3461) being connected to the rotating rod (344), and the second bevel gear (3462) being connected to the screw rod (34).

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