Fixed pulley type pipe aligning device

Abstract

A fixed pulley type pipe aligning device is provided with a C-shaped frame body, a set of supporting fixed pulleys are fixed in the frame body, each supporting fixed pulley comprises an upper support and a lower support, the upper supports are fixed to a double-layer supporting plate, the lower supports are fixed to a double-layer bottom plate, and the ends of pipes to be in butt joint are placed between the upper supports and the lower supports. Transverse bubbles and longitudinal bubbles are fixed to the upper surface of the double-layer bottom plate, racks are arranged on the edge of one side of the double-layer bottom plate, the bottoms of the frame bodies can be adjusted up and down through foundation bolts, the two aligning devices are in butt joint and used in a matched mode, and the sides, with the racks, of the frame bodies of the two aligning devices are in butt joint to form tooth meshing. And the hand-cranking hoist is pulled to adjust the relative position of the two aligning devices. The device is in four-point contact with the section of the pipe to be butted, compared with three-point coplanar, the precision is improved, the number of locking and adjusting nodes of the pipe is small, and the procedure complexity and the adjusting time of multi-jackscrew adjusting are omitted. And the welding stability and the levelness during butt joint of the pipes are ensured.

Description

Technical Field

[0001] This invention belongs to the field of offshore LNG vessel design and construction, and specifically relates to a pipe alignment device in the form of a fixed pulley. Background Technology

[0002] During pipe butt welding, ensuring concentricity of the pipe ends is crucial. Existing double-sided setter butt welding devices have numerous setter nodes, requiring adjustment of many setters and resulting in lengthy adjustment times. Tightening force also affects butt welding accuracy. The design of these setter butt welding devices is suitable for large-diameter pipes in the petroleum system but not for smaller-diameter pipes in shipbuilding. Furthermore, these devices lack pipe leveling adjustment functionality. This patent addresses the issues of accuracy and operational complexity in butt welding of pipes DN150 and below, improving construction efficiency and welding precision. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a pipe butt welding device in the form of a fixed pulley, aiming to improve the butt welding accuracy of pipes with a diameter of DN150 or less and reduce operational complexity. The technical solution adopted is as follows:

[0004] A pipe fitting device in the form of a fixed pulley has a C-shaped frame body. Inside the frame body, a set of supporting fixed pulleys is fixed. The end of the pipe to be fitted is placed on the supporting fixed pulleys. Each set of supporting fixed pulleys has an upper support and a lower support with the same structure. Both the upper support and the lower support have a horizontally arranged base plate. Fixed pulleys are fixed downward at both ends of the base plate of the upper support, and fixed pulleys are fixed upward at both ends of the bottom of the lower support. The two fixed pulleys and the base plate form an opening.

[0005] The main frame has a double-layer support plate at the top and a double-layer base plate at the bottom. The upper surface of the double-layer base plate is fixed with horizontal and vertical water bubbles. A toothed rack is set on one edge of the double-layer base plate. The upper support is fixed to the double-layer support plate by double-headed studs, and the lower support is fixed to the double-layer base plate by a support plate. The opening of the upper support faces downward and the opening of the lower support faces upward.

[0006] The bottom of the main frame is fixed with anchor bolts, which penetrate the double-layer base plate from bottom to top. The top is fixed with the anchor nut and the bottom is fixed with the adjusting nut.

[0007] Two matching devices are used in conjunction. The rack-equipped sides of the two matching device frames are aligned to form a toothed mesh. A hand-cranked hoist is fixed to the frame body. Pulling the hand-cranked hoist adjusts the relative position of the two matching devices. The rack misalignment is adjusted by pulling the hand-cranked hoist to make the cores of the two pipes align. The levelness of the frame is adjusted by adjusting the relative positions of the anchor bolts and anchor nuts, and adjusting the nuts, so that the cores of the pipes are level. This is verified by transverse and longitudinal bubble pressure tests.

[0008] Furthermore, in the aforementioned type of pipe fitting device with a fixed pulley, the top of the upper support is fixedly connected to one end of a double-ended stud, and the other end of the double-ended stud penetrates the double-layer support plate from bottom to top and is fixed with the top nut. The double-ended stud can move up and down relative to the double-layer support plate.

[0009] Furthermore, in the aforementioned type of pipe fitting device with a fixed pulley, the support plate passes through the double-layer base plate in sequence and is welded and fixed to the double-layer base plate.

[0010] Furthermore, in the aforementioned type of pipe fitting with a fixed pulley, washers are provided on both the upper and lower surfaces of the double-layer base plate at the anchor bolt location.

[0011] Furthermore, in the aforementioned type of pipe fitting device with a fixed pulley, the pipe to be fitted is placed between the upper support and the lower support.

[0012] Furthermore, in the aforementioned type of pipe fitting with a fixed pulley, the anchor nut is located on the upper surface of the double-layer base plate, and the adjusting nut is located on the lower surface of the double-layer base plate.

[0013] In the aforementioned type of pipe fitting device with fixed pulleys, the pipe to be fitted is placed between the upper support and the lower support. The two fixed pulleys of the upper support are tangent to the outer surface of the pipe to be fitted, and the two fixed pulleys of the lower support are tangent to the outer surface of the pipe to be fitted.

[0014] The beneficial effects of this invention are:

[0015] 1. Using a fixed pulley to contact the pipe results in four points of contact with the pipe cross-section, improving accuracy compared to three coplanar points. The new design reduces the number of locking and adjustment points with the pipe, eliminating the cumbersome process and time required for multiple set screw adjustments.

[0016] 2. The fixed pulley is tangential to the outer wall of the pipe and contacts the outer wall of the pipe along the pipe axis, ensuring pipe fixation and welding stability. This ensures welding precision and guarantees the pipe's horizontality during butt welding.

[0017] 3. This invention is easy to operate and has a wide range of applications. By adjusting the height of the upper opening of the fixed pulley with a stud and nut, it can be used for pipes with a diameter of DN150 or less. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0019] Figure 2 This is a side view of the structure of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of the present invention viewed from below;

[0021] Among them, 1-frame main body, 2-double-layer support plate, 3-double-layer bottom plate, 4-upper support, 5-lower support, 6-double-headed stud, 7-longitudinal bubble, 8-transverse bubble, 9-anchor nut, 10-rack, 11-top nut, 12-connector to be connected, 13-washer, 14-support plate, 15-anchor bolt, 16-adjusting nut, 17-bottom plate, 18-fixed pulley. Detailed Implementation

[0022] The invention will be further described with reference to the accompanying drawings.

[0023] A type of pipe fitting device in the form of a fixed pulley, such as Figure 1 , 2 As shown, there is a C-shaped frame body, inside which a set of supporting pulleys is fixed. The pipes to be connected are placed on the supporting pulleys. The top of the frame body is equipped with a double-layer support plate, and the bottom is equipped with a double-layer base plate. Each set of supporting pulleys has an upper support and a lower support with the same structure. Both the upper support and the lower support have a horizontally arranged base plate. The two ends of the base plate are fixed with pulleys pointing downwards, and the two pulleys form an opening with the base plate.

[0024] The upper support is fixed to the double-layer support plate by double-ended studs. The top of the upper support is fixedly connected to one end of the double-ended studs, and the other end of the double-ended studs penetrates the double-layer support plate from bottom to top and is fixed with the top nut. The double-ended studs can move up and down relative to the double-layer support plate. The upper surface of the double-layer base plate is fixed with transverse and longitudinal water bubbles.

[0025] The lower support is fixed to the double-layer base plate by support plates, which pass through the double-layer base plate and are welded to it. The opening of the upper support faces downwards, and the opening of the lower support faces upwards.

[0026] A toothed rack is provided on one edge of the double-layer base plate. Two mouthpieces are used in conjunction with each other. The toothed sides of the main frame of the two mouthpieces are connected to each other to form a tooth mesh. A hand-cranked hoist is fixed on the main frame. Pulling the hand-cranked hoist adjusts the relative position of the two mouthpieces.

[0027] like Figure 3 As shown, the bottom of the main frame is fixed with anchor bolts, which penetrate the double-layer bottom plate from bottom to top and are fixed with anchor nuts.

[0028] The usage method is as follows:

[0029] 1. Adjust the level of the main frame by observing the horizontal and vertical bubbles, and adjust the four anchor bolts up and down. Adjust the anchor bolts to make the double-layer base plate level, and then tighten the anchor nuts.

[0030] 2. Loosen the top nut and place the two end tubes into the lower support, sitting them on the opening of the lower support. Adjust the top nut to clamp the double-ended stud. The two fixed pulleys of the lower support are tangential to the outside of the tube, and the fixed pulleys contain the tube along the tube's axis, fixing the tube in place. Adjust rack 7 to fine-tune the left and right misalignment of the two tubes.

[0031] 3. Weld the pipe seam. After the pipe section is welded, loosen the top nut, move the upper support upward, and rotate the pipe until the repair weld is completed.

Claims

1. A pipe fitting device in the form of a fixed pulley, characterized in that, There is a C-shaped frame body (1), and a set of supporting fixed pulleys is fixed inside the frame body. The end of the pipe (12) to be connected is placed on the supporting fixed pulleys. Each set of supporting fixed pulleys has an upper support (4) and a lower support (5) with the same structure. Both the upper support and the lower support have a horizontally arranged base plate (17). The two ends of the base plate of the upper support are fixed with fixed pulleys (18) downward, and the two ends of the bottom of the lower support are fixed with fixed pulleys upward. The fixed pulleys and the base plate form an opening. The frame body is provided with a double-layer support plate (2) at the top and a double-layer bottom plate (3) at the bottom. A transverse bubble (8) and a longitudinal bubble (7) are fixed on the upper surface of the double-layer bottom plate. A toothed rack (10) is provided on one side edge of the double-layer bottom plate. The upper support is fixed to the double-layer support plate by a double-headed stud (6), and the lower support is fixed to the double-layer bottom plate by a support plate (14). The opening of the upper support is downward and the opening of the lower support is upward. Anchor bolts (15) are fixed at the bottom of the main frame. The anchor bolts penetrate the double bottom plate from bottom to top. The top is fixed with the anchor nut (9) and the bottom is fixed with the adjusting nut (16). The two mouthpieces are used together. The two mouthpiece frames are connected on opposite sides with the toothed rack (10) to form a toothed mesh. A hand-cranked hoist is fixed on the frame body. Pulling the hand-cranked hoist adjusts the relative position of the two mouthpieces.

2. A pipe fitting device in the form of a fixed pulley according to claim 1, characterized in that, The top of the upper support is fixedly connected to one end of the double-headed stud (6), and the other end of the double-headed stud penetrates the double-layer support plate from bottom to top and is fixed in conjunction with the top nut (11). The double-headed stud can move up and down relative to the double-layer support plate.

3. A pipe fitting device in the form of a fixed pulley according to claim 1, characterized in that, The support plate passes through the double-layer base plate in sequence and is welded and fixed to the double-layer base plate.

4. A pipe fitting device in the form of a fixed pulley according to claim 1, characterized in that, Washers (13) are provided on both the upper and lower surfaces of the double-layer base plate at the anchor bolt location.

5. A pipe fitting device in the form of a fixed pulley according to claim 1, characterized in that, The pipe to be connected is placed between the upper and lower supports.

6. A pipe fitting device in the form of a fixed pulley according to claim 1, characterized in that, Anchor nuts are located on the upper surface of the double-layer base plate, and adjusting nuts are located on the lower surface of the double-layer base plate.

7. A pipe fitting device in the form of a fixed pulley according to claim 1, characterized in that, The pipe to be connected is placed between the upper support and the lower support. The two fixed pulleys of the upper support are tangent to the outer surface of the pipe to be connected, and the two fixed pulleys of the lower support are tangent to the outer surface of the pipe to be connected.

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