Pipeline positioning clamp and welding equipment applying same

Abstract

The invention relates to the technical field of pipe fitting welding alignment equipment, and provides a pipeline positioning clamp and welding equipment applying the pipeline positioning clamp, the structure is simple, firstly, a handheld mounting frame is mounted outside a straight pipe through a preliminary clamping mechanism, then the axis of the handheld mounting frame coincides with the axis of the straight pipe through a correction clamping mechanism, and then the straight pipe is welded. Then the second pipe is placed on the lifting frame, the lower portion of the second pipe coincides with the axis of the straight pipe, then the lifting mechanism drives the second pipe to ascend and descend relative to the straight pipe to complete alignment of the straight pipe and the second pipe, the working efficiency is improved, it is guaranteed that the straight pipe and the second pipe are aligned, and welding of the second pipe and the straight pipe is facilitated; the device is convenient to carry and convenient for workers to carry according to a construction site; and moreover, even if the lower half part of the straight pipe is inclined to a certain degree, the alignment of the second pipe and the straight pipe is not influenced as the upper half part of the straight pipe of the handheld mounting frame is taken as a reference, so that the welding precision is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of pipe fitting welding alignment equipment, and in particular to a pipeline positioning fixture and welding equipment using the same. Background Art

[0002] In a long connecting pipe, the straight pipe and the bent pipe need to be welded to ensure the sealing performance. In the process of aligning the bent pipe and the straight pipe, the straight pipe is generally placed on a fixed seat, and then the bent pipe is placed on the fixed seat. This alignment of the straight pipe and the bent pipe occupies a relatively large area, which is not convenient for carrying and transporting during on-site construction; On the other hand, since the limitations of the straight pipe and the curved pipe are determined by the support and limiting mechanism on the fixed seat, if the axis of the straight pipe is not straight, there will be a deviation in the alignment of the straight pipe and the curved pipe. Summary of the invention

[0003] In order to solve the technical problems existing in the background technology, the present invention provides a pipeline positioning fixture and a welding device used therein.

[0004] The present invention provides a pipeline positioning fixture for aligning a second pipe with a straight pipe, comprising a lower base for vertically positioning the straight pipe, and a handheld mounting frame, the handheld mounting frame having a first limiting portion for positioning the outer side of the straight pipe, the handheld mounting frame being provided with a preliminary clamping mechanism for clamping the outer side of the straight pipe, the preliminary clamping mechanism being used to press the straight pipe against the first limiting portion, the preliminary clamping mechanism presses the straight pipe against the first limiting portion so as to install the handheld mounting frame on the straight pipe, and an installation interval being provided between the handheld mounting frame and the lower base; The handheld mounting frame is provided with a second limiting portion for positioning the outer side surface of the straight tube, the second limiting portion and the first limiting portion are distributed in the axial direction of the straight tube, and the handheld mounting frame is also provided with a correction clamping mechanism for clamping the outer side of the straight tube, the correction clamping mechanism is used to make the straight tube contact with the second limiting portion, and the correction clamping mechanism is used to make the straight tube contact with the first limiting portion and the second limiting portion; A telescopic mechanism is arranged on the handheld mounting frame, a lifting frame is arranged on the telescopic end of the telescopic mechanism, the lifting frame is located above the preliminary clamping mechanism and the correction clamping mechanism, and a second pipe clamping mechanism for clamping the second pipe is arranged on the lifting frame.

[0005] Preferably, the lifting frame has a third limiting portion for limiting the outer side surface of the second tube, and the second tube clamping mechanism is used to make the second tube contact with the third limiting portion, thereby achieving stable clamping and positioning of the second tube.

[0006] As a further optimized solution of the present invention, the preliminary clamping mechanism includes a first arm and a second arm mounted vertically on a handheld mounting frame, the first arm and the second arm are located outside the straight tube, and the first arm and the second arm are rotated to enable the first arm and the second arm to clamp the straight tube and make the straight tube contact with the first limiting portion.

[0007] As a further optimized solution of the present invention, it also includes a transverse driving mechanism, which is used to drive the first arm and the second arm to rotate so as to achieve the first arm and the second arm to hold the straight tube tightly or loosen.

[0008] As a further optimized solution of the present invention, the transverse driving mechanism includes a bidirectional screw rod, on which a first slider and a second slider are installed. The bidirectional screw rod is rotated to make the first slider and the second slider move toward or away from each other. The first arm has a first extension portion, which is vertically rotatably installed on the first slider. The second arm has a second extension portion, which is vertically rotatably installed on the second slider.

[0009] As a further optimized solution of the present invention, the handheld mounting frame has a first movable hole and a second movable hole, the first extension portion passes through the first movable hole and moves in the first movable hole, and the second extension portion passes through the second movable hole and moves in the second movable hole.

[0010] As a further optimized solution of the present invention, the handheld mounting frame includes a first mounting plate and a second mounting plate installed above the first mounting plate, the first limit portion is installed between the first mounting plate and the second mounting plate, and a bottom support for adjusting the distance between the first mounting plate and the second mounting plate is provided between the first mounting plate and the second mounting plate. It should be noted that the second tube can be a curved tube or a straight tube.

[0011] As a further optimized solution of the present invention, the bottom support includes a connected bottom support portion and a first bent portion, the bottom support portion is located between the first mounting plate and the second mounting plate, the first bent portion is located outside the first mounting plate and the second mounting plate, and the first bent portion has a first inclined surface that gradually slopes downward from a side close to the bottom support portion to a side away from the bottom support portion; Two groups of bottom supports are provided, and the two groups of bottom supports are arranged parallel to each other. When the axis of the first limiting portion coincides with the axis of the straight tube, the first inclined surfaces of the two groups of bottom supports are in the same plane. By placing a flat plate between the first inclined surfaces of the two groups of bottom supports and observing the gap between the flat plate and the first inclined surface, it is determined whether the axis of the first limiting portion coincides with the axis of the straight tube.

[0012] As a further optimized solution of the present invention, the handheld mounting bracket includes a third mounting plate and a fourth mounting plate installed on the third mounting plate, a bottom support column is provided between the third mounting plate and the second mounting plate, and the second limiting portion is fixed between the third mounting plate and the fourth mounting plate.

[0013] As a further optimized solution of the present invention, the correction clamping mechanism includes a correction locking piece and a correction half ring. The correction half ring is installed on the second limiting portion through the correction locking piece, and the distance between the correction half ring and the second limiting portion is adjusted by the correction locking piece. When the correction half ring and the second limiting portion tightly clamp the straight tube, there is an adjustment interval between the second limiting portion and the correction half ring.

[0014] As a further optimized solution of the present invention, a middle support is provided between the third mounting plate and the fourth mounting plate, the middle support includes a connected middle support portion and a third bending portion, the middle support portion is located between the third mounting plate and the fourth mounting plate, the third bending portion is located outside the third mounting plate and the fourth mounting plate, and the third bending portion has a second inclined surface that gradually inclines upward from a side close to the middle support portion to a side away from the middle support portion; There are two groups of middle supports, and the two groups of middle supports are arranged parallel to each other. When the axis of the second limiting portion coincides with the axis of the straight tube, the second inclined surfaces of the two groups of middle supports are in the same plane. By placing a flat plate between the second inclined surfaces of the two groups of middle supports and observing the gap between the flat plate and the second inclined surface, it is determined whether the axis of the second limiting portion coincides with the axis of the straight tube.

[0015] A welding device comprises the above-mentioned pipeline positioning fixture for aligning the second pipe and the straight pipe.

[0016] In the present invention, the pipeline positioning fixture and the welding equipment used therein are simple in structure. The handheld mounting frame is first mounted on the outside of the straight pipe by a preliminary clamping mechanism, and then the axis of the handheld mounting frame is aligned with the axis of the straight pipe by a correction clamping mechanism. Then, the second pipe is placed on the lifting frame to achieve the alignment of the bottom of the second pipe with the axis of the straight pipe. Then, the lifting mechanism drives the second pipe to rise and fall relative to the straight pipe to complete the alignment of the straight pipe and the second pipe, thereby increasing work efficiency and ensuring the alignment of the straight pipe with the second pipe, which is convenient for welding the second pipe and the straight pipe. The handheld mounting frame is easy to carry and is convenient for workers to carry according to the construction site. Furthermore, even if the lower half of the straight pipe is tilted to a certain extent, the handheld mounting frame uses the upper half of the straight pipe as a reference, which does not affect the alignment of the second pipe with the straight pipe, thereby ensuring welding accuracy.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the preliminary clamping mechanism structure of the present invention; Figure 3 This is a schematic diagram of the structure of the preliminary clamping mechanism of the present invention after the second tube is released; Figure 4 It is a structural schematic diagram of the correction clamping mechanism of the present invention; Figure 5 It is a structural schematic diagram of the second pipe clamping mechanism of the present invention; In the figure: 1, straight tube; 2, second tube; 3, lower base; 4, handheld mounting frame; 40, first mounting plate; 41, second mounting plate; 43, third mounting plate; 44, fourth mounting plate; 400, first movable hole; 401, second movable hole; 5, preliminary clamping mechanism; 50, first arm; 500, first extension; 51, second arm; 510, second extension; 52, bidirectional screw rod; 53, first slider; 54, second slider; 6, first limiter; 7, second limiter; 8, correction clamping mechanism; 80, correction locking member; 81. Correction half ring; 9. Telescopic mechanism; 10. Lifting frame; 11. Third limiting part; 12. Second tube clamping mechanism; 120. Second tube locking piece; 121. Second tube fixing half ring; 13. Bottom support; 130. Bottom support part; 131. First bending part; 1310. First inclined plane; 132. Second bending part; 1320. First horizontal plane; 14. Middle support; 140. Middle support part; 141. Third bending part; 1410. Second inclined plane; 142. Fourth bending part; 1420. Second horizontal plane; 15. Limiting cylinder. DETAILED DESCRIPTION

[0019] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0020] like Figure 1-Figure 5 A pipeline positioning fixture is shown, which is used for aligning a straight pipe 1 and a second pipe 2. In this embodiment, the second pipe 2 is a curved pipe; it includes a lower base 3 for vertically positioning the straight pipe 1, and also includes a handheld mounting frame 4. The handheld mounting frame 4 has a first limiting portion 6 for positioning the outer side of the straight pipe 1. The first limiting portion 6 has a first limiting surface matching the outer side of the straight pipe 1. The handheld mounting frame 4 is installed with a preliminary clamping mechanism 5 for clamping the outer side of the straight pipe 1. The preliminary clamping mechanism 5 is used to press the straight pipe 1 against the first limiting portion 6. The handheld mounting frame 4 is installed on the straight pipe through the preliminary clamping mechanism 5. There is an installation interval between the handheld mounting frame 4 and the lower base 3. The handheld mounting frame 4 is provided with a second limiting portion 7 for positioning the outer side surface of the straight tube 1, the second limiting portion 7 has a second limiting surface matching the outer side surface of the straight tube 1, the second limiting portion 7 and the first limiting portion 6 are distributed in the axial direction of the straight tube 1, and the handheld mounting frame 4 is also provided with a correction clamping mechanism 8 for clamping the outer side of the straight tube 1, the correction clamping mechanism 8 is used to make the straight tube 1 contact with the second limiting portion 7, and the correction clamping mechanism 8 is used to make the straight tube 1 contact with the first limiting portion 6 and the second limiting portion 7; A telescopic mechanism 9 is provided on the handheld mounting frame 4, and a lifting frame 10 is installed at the telescopic end of the telescopic mechanism 9. The lifting frame 10 is located above the preliminary clamping mechanism 5 and the corrective clamping mechanism 8. The lifting frame 10 has a third limiting portion 11 for limiting the outer side surface of the second tube 2. The third limiting portion 11 has a third limiting surface matching the lower outer side surface of the second tube 2. A second tube clamping mechanism 12 for clamping the second tube 2 is installed on the lifting frame 10. The second tube clamping mechanism 12 is used to make the second tube 2 contact the third limiting portion 11.

[0021] In the process of aligning the straight tube 1 and the second tube 2, the straight tube 1 is first placed on the lower base 3. The lower base 3 is provided with a groove for positioning the bottom of the straight tube 1. The groove can be an annular groove. In order to achieve the stability of the positioning of the straight tube 1, the depth of the annular groove can be relatively deep. Then, the handheld mounting frame 4 is moved so that the first limit surface and the second limit surface of the handheld mounting frame 4 are in contact with the outer side surface of the straight tube 1. Then, the preliminary positioning of the straight tube 1 is achieved through the preliminary clamping mechanism 5. At this time, the handheld mounting frame 4 does not need to be held by hand. Then, the correction clamping mechanism is installed. 8 realizes the positioning of the straight tube 1, then the side wall of the second tube 2 is abutted against the third limit portion 11, and the second tube clamping mechanism 12 is installed to realize the clamping and positioning of the second tube 2, and the preliminary clamping mechanism 5, the correction clamping mechanism 8 and the second tube clamping mechanism 12 are adjusted again to hold the straight tube 1 and the second tube 2 tightly to ensure that the lower side of the second tube 2 is coaxial with the straight tube 1, and then the lifting mechanism drives the lifting frame 10 to move downward to realize the contact between the lower end face of the second tube 2 and the upper end face of the straight tube 1, thereby completing the alignment of the second tube 2 and the straight tube 1.

[0022] Preferably, the preliminary clamping mechanism 5 includes a first arm 50 and a second arm 51 which are vertically rotatably mounted on the handheld mounting frame 4. The first arm 50 and the second arm 51 are located outside the straight tube 1. The first arm 50 and the second arm 51 are rotated to enable the first arm 50 and the second arm 51 to clamp the straight tube 1 and make the straight tube 1 contact with the first limiting surface of the first limiting portion 6.

[0023] Preferably, it also includes a transverse driving mechanism, which is used to drive the first arm 50 and the second arm 51 to rotate so that the first arm 50 and the second arm 51 can hold the straight tube 1 tightly or loosen it. The transverse driving mechanism includes a bidirectional screw rod 52, on which a first slider 53 and a second slider 54 are installed. The bidirectional screw rod 52 is rotated to make the first slider 53 and the second slider 54 move toward or away from each other. The first arm 50 has a first extension portion 500, which is vertically rotatably installed on the first slider 53. The second arm 51 has a second extension portion 510, which is vertically rotatably installed on the second slider 54. The first arm 50 and the second arm 51 are moved closer to or farther away from each other by rotating the double screw rod so as to hold or loosen the straight tube 1. When the first arm 50 and the second arm 51 and the first limiting surface are completely in contact with the straight tube 1, the positions where the first arm 50 and the second arm 51 and the first limiting surface contact the straight tube 1 are at the same height.

[0024] Preferably, the handheld mounting frame 4 is provided with a first movable hole 400 and a second movable hole 401, the first extension portion 500 passes through the first movable hole 400 and moves in the first movable hole 400, the second extension portion 510 passes through the second movable hole 401 and moves in the second movable hole, the height of the first movable hole 400 is equal to the height of the first extension portion 500 to achieve the limitation of the first extension portion 500, and the height of the second movable hole 401 is equal to the height of the second extension portion 510 to achieve the limitation of the second extension portion 510; under the premise of ensuring the effect of the first holding arm 50 and the second holding arm 51 to hold the straight tube 1 tightly, the bidirectional screw rod 52 does not need to be installed additionally on the handheld mounting frame 4, and the lateral distance from the bidirectional screw rod 52 to the handheld mounting frame 4 can be adjusted.

[0025] Preferably, the handheld mounting frame 4 includes a bottom mounting portion, the bottom mounting portion includes a first mounting plate 40 and a second mounting plate 41 installed above the first mounting plate 40, the first limiting portion 6 is installed between the first mounting plate 40 and the second mounting plate 41, and the first limiting portion 6 has a portion extending outside the first mounting plate 40 and the second mounting plate 41, the first limiting surface is located at the portion of the first limiting portion 6 extending outside the first mounting plate 40 and the second mounting plate 41, a first movable hole 400 and a second movable hole 401 are formed between the first mounting plate 40 and the second mounting plate 41, and a bottom support 13 is provided between the first mounting plate 40 and the second mounting plate 41 for adjusting the distance between the first mounting plate 40 and the second mounting plate.

[0026] Preferably, the bottom support 13 includes a connected bottom support portion 130 and a first bent portion 131, the bottom support portion 130 is located between the first mounting plate 40 and the second mounting plate 41, the first bent portion 131 is located outside the first mounting plate 40 and the second mounting plate 41, and the first bent portion 131 has a first inclined surface 1310 that gradually slopes downward from a side close to the bottom support portion 130 to a side away from the bottom support portion 130; Two groups of bottom supports 13 are provided, one group of bottom supports 13 is located at a first side of the first mounting plate 40 and the second mounting plate 41, and the other group of bottom supports 13 is located at the other side of the first mounting plate 40 and the second mounting plate 41. The two groups of bottom supports 13 are arranged parallel to each other, and when the axis of the first limiting surface coincides with the axis of the straight tube 1, the first inclined surfaces 1310 of the two groups of bottom supports 13 are in the same plane, and a flat plate can be placed between the first inclined surfaces 1310 of the two groups of bottom supports 13 and the gap between the flat plate and the first inclined surface 1310 can be observed to determine whether the axis of the first limiting surface coincides with the axis of the straight tube 1. Preferably, it also includes a second bending portion 132, which is located on the side of the first bending portion 131 away from the bottom support portion 130, and the second bending portion 132 is bent relative to the first bending portion 131. The side of the second bending portion 132 away from the first bending portion 131 is a first horizontal plane 1320. When the axis of the first limiting surface coincides with the axis of the straight tube 1, the first horizontal planes 1320 of the two groups of bottom supports 13 are in the same horizontal plane, which further facilitates verification of whether the axis of the first limiting surface coincides with the axis of the straight tube 1.

[0027] Preferably, the correction clamping mechanism 8 includes a correction locking piece 80 and a correction half ring 81. The correction half ring 81 is installed on the second limiting portion 7 through the correction locking piece 80, and the distance between the correction half ring 81 and the second limiting portion 7 is adjusted by the correction locking piece 80. When the correction half ring 81 and the second limiting portion 7 are tightly clamped to the straight pipe 1, there is an adjustment interval between the second limiting portion 7 and the correction half ring 81. Specifically, the correction locking piece 80 includes two bolts, and the bolts are rotated to fix the correction half ring 81 and the second limiting portion 7.

[0028] Preferably, the handheld mounting frame 4 includes a third mounting plate 43 and a fourth mounting plate 44 mounted on the third mounting plate 43 and located above the third mounting plate 43, a bottom support column 13 is provided between the third mounting plate 43 and the second mounting plate 41, a second limiting portion 7 is fixed between the third mounting plate 43 and the fourth mounting plate 44, an adjustment gap is formed between the third mounting plate 43 and the fourth mounting plate 44, the correction locking member 80 passes through the adjustment gap and has a portion located outside the handheld mounting frame 4, thereby facilitating user operation.

[0029] Preferably, a middle support 14 is provided between the third mounting plate 43 and the fourth mounting plate 44 , and the middle support 14 is used to ensure that the third mounting plate 43 and the fourth mounting plate 44 are spaced apart and the distance between the third mounting plate 43 and the fourth mounting plate 44 can be adjusted.

[0030] Preferably, the middle support 14 includes a connected middle support portion 140 and a third bending portion 141, the middle support portion 140 is located between the third mounting plate 43 and the fourth mounting plate 44, the third bending portion 141 is located outside the third mounting plate 43 and the fourth mounting plate 44, and the third bending portion 141 has a second inclined surface 1410 that gradually tilts upward from the side close to the middle support portion 140 to the side away from the middle support portion 140; There are two groups of middle supports 14, one group of middle supports 14 is located on the first side of the third mounting plate 43 and the fourth mounting plate 44, and the other group of bottom supports 13 is located on the other side of the third mounting plate 43 and the fourth mounting plate 44. The two groups of middle supports 14 are arranged parallel to each other, and when the axis of the second limiting surface coincides with the axis of the straight tube 1, the second inclined surfaces 1410 of the two groups of middle supports 14 are in the same plane, and a flat plate can be placed between the second inclined surfaces 1410 of the two groups of middle supports 14 and the gap between the flat plate and the second inclined surface 1410 can be observed to determine whether the axis of the second limiting surface of the second limiting portion 7 coincides with the axis of the straight tube 1; and then detect whether the axis of the correction clamping mechanism 8 coincides with the axis of the straight tube 1; Preferably, it also includes a fourth bending portion 142, which is located on the side of the third bending portion 141 away from the middle support portion 140, and the fourth bending portion 142 is bent relative to the third bending portion 141. The side of the fourth bending portion 142 away from the first bending portion 131 is a second horizontal plane 1420. When the axis of the second limiting surface coincides with the axis of the straight tube 1, the second horizontal planes 1420 of the two groups of middle supports 14 are in the same horizontal plane, which further facilitates verification of whether the axis of the second limiting surface coincides with the axis of the straight tube 1.

[0031] Specifically, the telescopic mechanism 9 is installed on the first mounting plate 40 and the second mounting plate 41, and a sliding rod is installed at the telescopic end of the telescopic mechanism 9. A limiting cylinder 15 is installed between the third mounting plate 43 and the fourth mounting plate 44. The sliding rod is vertically slidably installed in the limiting cylinder 15 and slides in the limiting cylinder 15. The part of the sliding rod extending out of the limiting cylinder 15 is connected to the lifting frame 10. The lifting mechanism is provided with two groups, one of the two groups of lifting mechanisms is connected to one side of the lifting frame 10, and the other group of lifting mechanisms is connected to the other side of the lifting frame 10, thereby increasing the premise of the stability of the elevator during the lifting process and facilitating ensuring that the lower end of the second tube 2 is coaxial with the straight tube 1.

[0032] Preferably, the second tube clamping mechanism 12 includes a second tube 2 locking piece and a second tube 2 fixing half ring, the second tube 2 fixing half ring is fixed to the third limiting portion 11 by the second tube 2 locking piece, and the distance between the second tube 2 fixing half ring and the third limiting portion 11 is adjusted by the second tube 2 locking piece, and when the second tube 2 fixing half ring and the third limiting portion 11 are tightly clamped to the bottom of the second tube 2, there is an adjustment interval between the third limiting portion 11 and the second tube 2 fixing half ring. Specifically, the second tube 2 locking piece includes two bolts, and the bolts are rotated to fix the second tube 2 fixing half ring and the third limiting portion 11.

[0033] A welding device comprises the above-mentioned pipeline positioning fixture, through which the second pipe 2 and the straight pipe 1 are aligned, so as to facilitate welding of the second pipe 2 and the straight pipe 1.

[0034] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrated; it can be mechanically connected, electrically connected, or communicable with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pipeline positioning fixture, used for aligning a second pipe (2) and a straight pipe (1), characterized in that: The invention comprises a lower base (3) for vertically positioning a straight pipe (1), and a handheld mounting frame (4), wherein the handheld mounting frame (4) is provided with a first limiting portion (6) and a preliminary clamping mechanism (5) for clamping the outer side of the straight pipe, wherein the preliminary clamping mechanism (5) causes the straight pipe (1) to be pressed against the first limiting portion (6) so that the handheld mounting frame (4) is mounted on the straight pipe (1), and an installation interval is provided between the handheld mounting frame (4) and the lower base (3); The handheld mounting frame (4) is provided with a second limiting portion (7) for positioning the outer side surface of the straight tube (1); the second limiting portion (7) and the first limiting portion (6) are distributed in the axial direction of the straight tube (1); the handheld mounting frame (4) is also provided with a correction clamping mechanism (8) for clamping the outer side of the straight tube (1); the correction clamping mechanism (8) is used to make the straight tube (1) contact the surface of the first limiting portion (6) and the second limiting portion (7); A lifting frame (10) is installed on the handheld mounting frame (4) via a telescopic mechanism (9). The lifting frame (10) is located above the preliminary clamping mechanism (5) and the correction clamping mechanism (8). A second pipe clamping mechanism (12) for clamping the second pipe (2) is installed on the lifting frame (10).

2. The pipeline positioning fixture according to claim 1, characterized in that: The preliminary clamping mechanism (5) comprises a first arm (50) and a second arm (51) which are mounted on a handheld mounting frame (4) for vertical rotation. The first arm (50) and the second arm (51) are located outside the straight tube (1). The first arm (50) and the second arm (51) are rotated to enable the first arm (50) and the second arm (51) to clamp the straight tube (1) and make the straight tube (1) contact with the first limit portion (6).

3. The pipeline positioning fixture according to claim 2, characterized in that: It also comprises a transverse driving mechanism, which is used to drive the first embracing arm (50) and the second embracing arm (51) to rotate so as to enable the first embracing arm (50) and the second embracing arm (51) to hold the straight tube (1) tightly or loosen it.

4. The pipeline positioning fixture according to claim 3, characterized in that: The transverse driving mechanism comprises a bidirectional screw rod (52), on which a first slider (53) and a second slider (54) are mounted, and the bidirectional screw rod (52) is rotated to make the first slider (53) and the second slider (54) move toward or away from each other, the first embracing arm (50) comprises a first extension part (500), which is vertically rotatably mounted on the first slider (53), and the second embracing arm (51) comprises a second extension part (510), which is vertically rotatably mounted on the second slider (54).

5. The pipeline positioning fixture according to claim 4, characterized in that: The handheld mounting frame (4) is provided with a first movable hole (400) and a second movable hole (401); the first extension portion (500) passes through the first movable hole (400) and moves in the first movable hole (400); and the second extension portion (510) passes through the second movable hole (401) and moves in the second movable hole.

6. The pipeline positioning fixture according to any one of claims 1 to 5, characterized in that: The handheld mounting frame (4) comprises a first mounting plate (40) and a second mounting plate (41) mounted above the first mounting plate (40); a first limiting portion (6) is mounted between the first mounting plate (40) and the second mounting plate (41); and a bottom support (13) for adjusting the distance between the first mounting plate (40) and the second mounting plate (41) is provided between the first mounting plate (40) and the second mounting plate (41).

7. The pipeline positioning fixture according to claim 6, characterized in that: The bottom support (13) comprises a connected bottom support portion (130) and a first bent portion (131); the bottom support portion (130) is located between the first mounting plate (40) and the second mounting plate (41); the first bent portion (131) is located outside the first mounting plate (40) and the second mounting plate (41); the first bent portion (131) has a first inclined surface (1310) which gradually slopes downward from a side close to the bottom support portion (130) to a side away from the bottom support portion (130); Two groups of bottom supports (13) are provided, and the two groups of bottom supports (13) are arranged parallel to each other. When the axis of the first limit portion (6) coincides with the axis of the straight tube (1), the first inclined surfaces (1310) of the two groups of bottom supports (13) are in the same plane. By placing a flat plate between the first inclined surfaces (1310) of the two groups of bottom supports (13) and observing the gap between the flat plate and the first inclined surface (1310), it is determined whether the axis of the first limit portion (6) coincides with the axis of the straight tube (1).

8. The pipeline positioning fixture according to claim 6, characterized in that: The handheld mounting frame (4) comprises a third mounting plate (43) and a fourth mounting plate (44) mounted on the third mounting plate (43); a bottom support (13) column is provided between the third mounting plate (43) and the second mounting plate (41); and a second limiting portion (7) is fixed between the third mounting plate (43) and the fourth mounting plate (44).

9. The pipeline positioning fixture according to claim 8, characterized in that: A middle support (14) is provided between the third mounting plate (43) and the fourth mounting plate (44), the middle support (14) comprising a connected middle support portion (140) and a third bending portion (141), the middle support portion (140) being located between the third mounting plate (43) and the fourth mounting plate (44), the third bending portion (141) being located outside the third mounting plate (43) and the fourth mounting plate (44), and the third bending portion (141) having a second inclined surface (1410) gradually inclined upward from a side close to the middle support portion (140) to a side away from the middle support portion (140); Two groups of middle supports (14) are provided, and the two groups of middle supports (14) are arranged parallel to each other. When the axis of the second limiting portion (7) coincides with the axis of the straight tube (1), the second inclined surfaces (1410) of the two groups of middle supports (14) are in the same plane. By placing a flat plate between the second inclined surfaces (1410) of the two groups of middle supports (14) and observing the gap between the flat plate and the second inclined surface (1410), it is determined whether the axis of the second limiting portion (7) coincides with the axis of the straight tube (1).

10. A welding device, characterized in that: It comprises the pipeline positioning fixture for aligning the second pipe (2) and the straight pipe (1) as described in any one of claims 1 to 9.

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