A centering fixture for flange welding

Abstract

The invention discloses a centering fixture for flange welding, which relates to the field of construction equipment. The technical solution is as follows: the fixture comprises a rotating shaft, one end of the rotating shaft is provided with an external thread, the other end is fixedly provided with a handle, a sleeve is sleeved on the end of the rotating shaft close to the handle, a flange positioning mechanism for flange positioning and clamping is provided at the end of the sleeve close to the handle, and a pipeline positioning mechanism for pipeline support and positioning is provided at the other end, and the pipeline positioning mechanism and the flange positioning mechanism are driven by the rotating shaft. The beneficial effects of the invention are: accurate centering of the flange and the pipeline can be achieved, stable positioning, improved welding accuracy, ensuring tight and firm connection of the pipeline, and enhanced sealing and stability; the fixture is easy to operate, and the centering of the pipeline and the flange can be achieved by simply turning the handle, thereby improving construction efficiency.

Description

Technical Field

[0001] The invention relates to the field of building construction, and in particular to a centering clamp used for flange welding. Background Art

[0002] In the field of construction, the installation of pipeline systems is a vital task. As a common pipeline connection method, the welding quality of flange connection directly affects the stability, sealing and safety of the pipeline system in the construction project.

[0003] In the traditional construction process, flange welding alignment mostly relies on workers' experience and simple tools for rough adjustment, which has many disadvantages. First, the accuracy of manual alignment is difficult to guarantee, and it is easy to have problems such as misalignment and misalignment between the flange and the pipe, which leads to loose joints after welding, which may cause leakage during subsequent use and affect the normal operation of the entire building pipeline system; secondly, there is a lack of effective positioning and clamping devices, and the pipe and flange are easily disturbed by external factors during the welding process, which greatly affects the welding quality and efficiency. Summary of the invention

[0004] In view of the above technical problems, the present invention provides a centering fixture for flange welding.

[0005] The technical solution is that it includes a rotating shaft, one end of the rotating shaft is provided with an external thread, and the other end is fixedly provided with a handle, a sleeve is sleeved on the end of the rotating shaft close to the handle, and the end of the sleeve close to the handle is provided with a flange positioning mechanism for flange positioning and clamping, and the other end is provided with a pipeline positioning mechanism for pipeline support and positioning, and the pipeline positioning mechanism and the flange positioning mechanism are driven by the rotating shaft.

[0006] Preferably, the pipeline positioning mechanism comprises a driving sleeve threadedly connected to the external thread, a moving ring is sleeved on the outer side of the driving sleeve, a plurality of first connecting rods are arranged in a circumferential array on the moving ring, the first connecting rods are rotatably connected to the moving ring, a plurality of second connecting rods are rotatably arranged at one end of the sleeve close to the thread, and the middle part of each second connecting rod is rotatably connected to the middle part of the corresponding first connecting rod;

[0007] The movable end of the first connecting rod is rotatably provided with a support rod, the support rod is provided with a guide groove on one side facing the moving ring, and the movable end of the second connecting rod slides in the guide groove.

[0008] Preferably, the movable ring and the driving sleeve are axially slidable and radially fixed, a plurality of annular grooves are arranged in an array on the outer wall of the driving sleeve, and a plurality of overload protection units are arranged in an array circumferentially on the body of the movable ring.

[0009] Preferably, the overload protection unit includes a plurality of slots opened on the movable ring body, a limit block slides in each of the slots, the limit block is in a fan-shaped block shape, a plurality of protrusions are arranged on the inner wall of the limit block, the protrusions correspond to the grooves, and the limit block is provided with some fixed compression springs away from the protrusions, one end of the compression spring is fixedly connected to the limit block, and the other end is fixedly connected to the movable ring.

[0010] Preferably, the flange positioning mechanism comprises a plurality of fixing rods arranged in a circumferential array on the outer wall of the sleeve, each fixing rod is provided with a slide groove, a sliding rod is slidably arranged in the slide groove, a screw is fixedly arranged at one end of the sliding rod away from the fixing rod, a hook is fixedly arranged at the side of the sliding rod away from the screw, a driven bevel gear is also rotatably arranged on the fixing rod, an adjusting cylinder is coaxially fixedly arranged on the driven bevel gear, an internal thread is arranged on the inner wall of the adjusting cylinder, and the adjusting cylinder is threadedly connected with the screw;

[0011] A driving bevel gear is sleeved on the rotating shaft, and the driving bevel gear is meshed with the driven bevel gears respectively. An anti-overload transmission unit is arranged between the rotating shaft and the driving bevel gear.

[0012] Preferably, the anti-overload transmission unit comprises a driving disc coaxial with the rotating shaft, the driving disc axially slides and radially fixed with the rotating shaft, a plurality of teeth are arranged in a circumferential array on a side of the driving disc facing the driving bevel gear, a driven disc is coaxially fixedly arranged on the driving bevel gear, a plurality of teeth are arranged in an array on a side of the driven disc facing the driving disc, and when the driving disc approaches the driven disc, the teeth of the driving disc mesh with the teeth of the driven disc;

[0013] A spring is fixedly arranged on a side of the active disk away from the teeth, one end of the spring is fixedly connected to the active disk, and the other end of the spring is fixedly connected to the rotating shaft.

[0014] The beneficial effects of the technical solution provided by the embodiment of the present invention are: it can achieve precise alignment of the flange and the pipeline, stable positioning, improve welding accuracy, ensure that the pipeline is tightly and firmly connected, and enhance sealing and stability; the clamp is easy to operate, and the centering of the pipeline and the flange can be achieved by simply turning the handle, thereby improving construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the present invention in use state.

[0016] Figure 2 Schematic diagram of the overall structure of an embodiment of the present invention.

[0017] Figure 3 Schematic diagram of a pipeline positioning mechanism according to an embodiment of the present invention.

[0018] Figure 4 Schematic diagram of a driving sleeve and a moving ring according to an embodiment of the present invention.

[0019] Figure 5 Schematic diagram of an overload protection unit according to an embodiment of the present invention.

[0020] Figure 6 Schematic diagram of a flange positioning mechanism according to an embodiment of the present invention.

[0021] Figure 7 Schematic diagram of the structure of an anti-overload transmission unit according to an embodiment of the present invention.

[0022] Among them, the accompanying drawings are marked as follows: 1. rotating shaft; 2. external thread; 3. handle; 4. sleeve; 5. flange positioning mechanism; 6. pipeline positioning mechanism; 7. driving sleeve; 8. moving ring; 9. first connecting rod; 10. second connecting rod; 11. support rod; 12. guide groove; 13. groove; 14. overload protection unit; 15. limit block; 16. bump; 17. compression spring; 18. fixed rod; 19. sliding rod; 20. screw; 21. hook; 22. driven bevel gear; 23. adjusting cylinder; 24. driving bevel gear; 25. anti-overload transmission unit; 26. driving disk; 27. driven disk; 28. spring; 29. ​​pipeline; 30. flange. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. Of course, the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0024] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying 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 a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0026] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 invention can be understood according to specific circumstances.

[0027] Example 1

[0028] See also Figures 1 to 7 The present invention provides a centering fixture for flange welding, including a rotating shaft 1, an external thread 2 is arranged at one end of the rotating shaft 1, a handle 3 is fixedly arranged at the other end, a sleeve 4 is sleeved on the end of the rotating shaft 1 close to the handle 3, a flange positioning mechanism 5 for flange positioning and clamping is arranged at the end of the sleeve 4 close to the handle 3, and a pipeline positioning mechanism 6 for supporting and positioning a pipeline 29 is arranged at the other end, and the pipeline positioning mechanism 6 and the flange positioning mechanism 5 are driven by the rotating shaft 1.

[0029] The user turns the handle 3 to realize the operation of the pipeline positioning mechanism 6 and the flange positioning mechanism 5. Under the action of the rotating shaft 1, the pipeline positioning mechanism 6 and the flange positioning mechanism 5 align the central axes of the pipeline 29 and the flange 30, thereby achieving the purpose of centering.

[0030] After the pipe 29 and the flange 30 are aligned, they can be fixed by electric welding. During the electric welding process, the clamp can keep the relative position of the pipe 29 and the flange 30 stable to ensure the welding quality;

[0031] After the spot welding is completed, the handle 3 is rotated in the opposite direction to loosen the pipeline positioning mechanism 6 and the flange positioning mechanism 5, and the clamp is taken out, and then the pipeline 29 and the flange 30 are welded and fixed.

[0032] The pipeline positioning mechanism 6 includes a driving sleeve 7 threadedly connected to the external thread 2, a moving ring 8 is sleeved on the outer side of the driving sleeve 7, a plurality of first connecting rods 9 are arranged in a circumferential array on the moving ring 8, the first connecting rods 9 are rotatably connected to the moving ring 8, and a plurality of second connecting rods 10 are rotatably arranged at one end of the sleeve 4 close to the thread, and the middle part of each second connecting rod 10 is rotatably connected to the middle part of the corresponding first connecting rod 9;

[0033] The movable end of the first connecting rod 9 is rotatably provided with a support rod 11 , and a guide groove 12 is provided on one side of the support rod 11 facing the movable ring 8 , and the movable end of the second connecting rod 10 slides in the guide groove 12 .

[0034] When the device is used, the pipe positioning mechanism 6 is inserted into the pipe 29 to be welded. When the operator turns the handle 3, the handle 3 drives the shaft 1 to rotate. Due to the effect of the external thread 2, the rotation of the shaft 1 causes the driving sleeve 7 to move along the axial direction of the shaft 1.

[0035] The movement of the driving sleeve 7 drives the moving ring 8 to move. A plurality of first connecting rods 9 are arranged in an array on the moving ring 8. The first connecting rods 9 are rotatably connected to the moving ring 8. When the moving ring 8 moves, the first connecting rods 9 are driven to move.

[0036] When the first connecting rod 9 moves, it will drive the second connecting rod 10 to move through the connection relationship with the second connecting rod 10. At the same time, the movable end of the first connecting rod 9 is rotated to set the support rod 11, and the support rod 11 is provided with a guide groove 12 on the side of the moving ring 8. The movable end of the second connecting rod 10 slides in the guide groove 12. This structure enables the movement of the first connecting rod 9 and the second connecting rod 10 to drive the support rod 11 to adjust its position;

[0037] As the handle 3 rotates, the support rod 11 will be adaptively adjusted according to the size and position of the pipe 29, supporting and positioning the pipe 29 from different directions, so that the central axis of the pipe 29 tends to coincide with the axis of the rotating shaft 1, thereby achieving accurate positioning of the pipe 29.

[0038] The moving ring 8 and the driving sleeve 7 are axially sliding and radially fixed, a positioning key is fixedly set on the inner wall of the moving ring 8, and a positioning groove is opened on the outer wall of the moving ring 8. The positioning key slides in the positioning groove, and the axial sliding and radial fixing are achieved by the positioning key and the positioning groove. A plurality of annular grooves 13 are arranged in an array on the outer wall of the driving sleeve 7, and a plurality of overload protection units 14 are arranged in a circumferential array on the body of the moving ring 8.

[0039] The overload protection unit 14 includes a plurality of slots opened on the main body of the movable ring 8, and a limit block 15 slides in each slot. The limit block 15 is in the shape of a fan-shaped block. A plurality of protrusions 16 are arranged on the inner wall of the limit block 15. The protrusions 16 correspond to the grooves 13. Some compression springs 17 are fixedly arranged on the limit block 15 away from the protrusions 16. One end of the compression spring 17 is fixedly connected to the limit block 15, and the other end is fixedly connected to the movable ring 8.

[0040] Due to the different diameters of different pipes 29 and flanges 30, in normal use, when the driving force is within a normal range, that is, the support rod 11 does not contact the inner wall of the pipe 29, the protrusion 16 on the limit block 15 keeps in contact with the groove 13 on the outer wall of the driving sleeve 7, and the compression spring 17 is in a normal state, ensuring that the moving ring 8 moves smoothly with the driving sleeve 7;

[0041] When the support rod 11 abuts against the inner wall of the pipe 29, and the flange positioning mechanism 5 has not yet completed the centering, the user will continue to rotate the handle 3. When the rotating shaft 1 continues to rotate, the support rod 11 abuts against the inner wall of the pipe 29, and the movable ring 8 remains in a relatively fixed state. As the driving sleeve 7 continues to move, the force of the driving sleeve 7 on the limit block 15 increases, and the limit block 15 compresses the compression spring 17 and slides into the notch on the body of the movable ring 8. Since the limit blocks 15 are fan-shaped and are arranged in a circumferential array on the body of the movable ring 8, multiple limit blocks 15 will act simultaneously.

[0042] The inner wall protrusion 16 of the limit block 15 is gradually separated from the groove 13 on the outer wall of the driving sleeve 7, thereby reducing the direct force of the driving sleeve 7 on the movable ring 8, and ensuring that when the support rod 11 is against the inner wall of the pipe 29, the rotating shaft 1 can continue to rotate, adapting to the centering operation of pipes 29 and flanges 30 of different diameters. The synchronous operation of the pipe positioning mechanism 6 and the flange positioning mechanism 5 can be achieved by simply rotating the rotating shaft 1.

[0043] The flange positioning mechanism 5 includes a plurality of fixed rods 18 arranged in a circumferential array on the outer wall of the sleeve 4, each fixed rod 18 is provided with a slide groove, a sliding rod 19 is slidably arranged in the slide groove, a screw 20 is fixedly arranged at one end of the sliding rod 19 away from the fixed rod 18, a hook 21 is fixedly arranged at the side of the sliding rod 19 away from the screw 20, a driven bevel gear 22 is also rotatably arranged on the fixed rod 18, an adjusting cylinder 23 is coaxially fixedly arranged on the driven bevel gear 22, an internal thread is arranged on the inner wall of the adjusting cylinder 23, and the adjusting cylinder 23 is threadedly connected with the screw 20;

[0044] A driving bevel gear 24 is sleeved on the rotating shaft 1 , and the driving bevel gear 24 is meshed with the driven bevel gear 22 , respectively. An anti-overload transmission unit 25 is arranged between the rotating shaft 1 and the driving bevel gear 24 .

[0045] When the position or angle of the flange 30 needs to be adjusted, the handle 3 is turned, and the handle 3 drives the rotating shaft 1 to rotate, and the active bevel gear 24 sleeved on the rotating shaft 1 rotates accordingly;

[0046] The driving bevel gear 24 is meshed with the driven bevel gear 22 respectively, and the rotation of the driving bevel gear 24 drives the driven bevel gear 22 to rotate; the rotation of the driven bevel gear 22 further drives the adjusting cylinder 23 to rotate, and the rotation of the adjusting cylinder 23 causes the screw 20 to move toward the flange 30 under the action of the thread, so that the hook 21 on the sliding rod 19 tightly hooks the flange 30, thereby realizing the positioning and clamping of the flange 30.

[0047] The anti-overload transmission unit 25 includes a driving disc 26 coaxial with the rotating shaft 1, the driving disc 26 slides axially and is radially fixed with the rotating shaft 1, a plurality of teeth are arranged in a circumferential array on one side of the driving disc 26 facing the driving bevel gear 24, a driven disc 27 is coaxially fixedly arranged on the driving bevel gear 24, a plurality of teeth are arranged in an array on one side of the driven disc 27 facing the driving disc 26, and when the driving disc 26 approaches the driven disc 27, the teeth of the driving disc 26 mesh with the teeth of the driven disc 27;

[0048] A spring 28 is fixedly disposed on a side of the active disk 26 away from the teeth. One end of the spring 28 is fixedly connected to the active disk 26 , and the other end of the spring 28 is fixedly connected to the rotating shaft 1 .

[0049] Due to the different diameters of different pipes 29 and flanges 30, in normal use, when the driving force is within a normal range, that is, the hook 21 is not completely in contact with the outer wall of the flange 30, and at this time, the support rod 11 does not contact the inner wall of the pipe 29;

[0050] The user will continue to rotate the handle 3. When the shaft 1 continues to rotate, since the hooks 21 are all in contact with the outer wall of the flange 30, the axial force on the active disk 26 will overcome the elastic force of the spring 28, so that the active disk 26 moves away from the driven disk 27 in the axial direction, and the teeth are disengaged. This can prevent the shaft 1 and the active bevel gear 24 from being damaged, and also avoid excessive clamping force on the flange 30, which may cause deformation or damage to the flange 30 or the hook 21.

[0051] It is suitable for centering of pipes 29 and flanges 30 of different diameters. The pipe positioning mechanism 6 and the flange positioning mechanism 5 can be synchronized by rotating the rotating shaft 1 .

[0052] When the present invention is used, the user rotates the handle 3 to realize the operation of the pipeline positioning mechanism 6 and the flange positioning mechanism 5. Under the action of the rotating shaft 1, the pipeline positioning mechanism 6 and the flange positioning mechanism 5 align the central axes of the pipeline 29 and the flange 30, thereby achieving the purpose of centering.

[0053] After the pipe 29 and the flange 30 are aligned, they can be fixed by electric welding. During the electric welding process, the clamp can keep the relative position of the pipe 29 and the flange 30 stable to ensure the welding quality;

[0054] After the spot welding is completed, the handle 3 is rotated in the opposite direction to loosen the pipeline positioning mechanism 6 and the flange positioning mechanism 5, and the clamp is taken out, and then the pipeline 29 and the flange 30 are welded and fixed.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A centering fixture for flange welding, characterized in that: It comprises a rotating shaft (1), one end of the rotating shaft (1) is provided with an external thread (2), the other end is fixedly provided with a handle (3), a sleeve (4) is sleeved on the end of the rotating shaft (1) close to the handle (3), the end of the sleeve (4) close to the handle (3) is provided with a flange positioning mechanism (5) for flange positioning and clamping, and the other end is provided with a pipeline positioning mechanism (6) for supporting and positioning a pipeline (29), the pipeline positioning mechanism (6) and the flange positioning mechanism (5) are driven by the rotating shaft (1); The pipeline positioning mechanism (6) comprises a driving sleeve (7) threadedly connected to the external thread (2); a movable ring (8) is sleeved on the outer side of the driving sleeve (7); a plurality of first connecting rods (9) are arranged in a circumferential array on the movable ring (8); the first connecting rods (9) are rotatably connected to the movable ring (8); a plurality of second connecting rods (10) are rotatably arranged at one end of the sleeve (4) close to the thread; the middle portion of each second connecting rod (10) is rotatably connected to the middle portion of the corresponding first connecting rod (9); The movable end of the first connecting rod (9) is rotatably provided with a support rod (11), the support rod (11) is provided with a guide groove (12) on one side facing the movable ring (8), and the movable end of the second connecting rod (10) slides in the guide groove (12); The moving ring (8) and the driving sleeve (7) are axially slidable and radially fixed, a plurality of annular grooves (13) are arranged in an array on the outer wall of the driving sleeve (7), and a plurality of overload protection units (14) are arranged in an array circumferentially on the body of the moving ring (8); The overload protection unit (14) comprises a plurality of notches formed on the main body of the movable ring (8), a limit block (15) slides in each of the notches, the limit block (15) is in the shape of a fan-shaped block, a plurality of protrusions (16) are arranged on the inner wall of the limit block (15), the protrusions (16) correspond to the grooves (13), and a compression spring (17) is fixedly arranged on the limit block (15) away from the protrusions (16), one end of the compression spring (17) is fixedly connected to the limit block (15), and the other end is fixedly connected to the movable ring (8); The flange positioning mechanism (5) comprises a plurality of fixed rods (18) arranged in a circumferential array on the outer wall of the sleeve (4), each of the fixed rods (18) being provided with a slide groove, a sliding rod (19) being slidably arranged in the slide groove, a screw rod (20) being fixedly arranged at one end of the sliding rod (19) away from the fixed rod (18), a hook (21) being fixedly arranged at the side of the sliding rod (19) away from the screw rod (20), a driven bevel gear (22) being rotatably arranged on the fixed rod (18), an adjusting cylinder (23) being coaxially fixedly arranged on the driven bevel gear (22), an internal thread being arranged on the inner wall of the adjusting cylinder (23), and the adjusting cylinder (23) being threadedly connected to the screw rod (20); A driving bevel gear (24) is sleeved on the rotating shaft (1), the driving bevel gear (24) is meshed with the driven bevel gear (22) respectively, and an anti-overload transmission unit (25) is provided between the rotating shaft (1) and the driving bevel gear (24).

2. The centering fixture for flange welding according to claim 1, characterized in that: The anti-overload transmission unit (25) comprises a driving disc (26) coaxial with the rotating shaft (1), the driving disc (26) and the rotating shaft (1) being axially slidable and radially fixed, a plurality of teeth being arranged in a circumferential array on one side of the driving disc (26) facing the driving bevel gear (24), a driven disc (27) being coaxially fixedly arranged on the driving bevel gear (24), a plurality of teeth being arranged in an array on one side of the driven disc (27) facing the driving disc (26), and when the driving disc (26) approaches the driven disc (27), the teeth of the driving disc (26) mesh with the teeth of the driven disc (27); A spring (28) is fixedly arranged on a side of the active disk (26) facing away from the teeth, one end of the spring (28) is fixedly connected to the active disk (26), and the other end is fixedly connected to the rotating shaft (1).

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