Sleeve assembly tool and use method

Abstract

The invention discloses a sleeve assembling tool and a using method. The tool comprises a main body bracket, a supporting frame, an arc-shaped support, a balancing weight and the like. The assembly direction of the sleeve is fixed through the limiting plate and the eccentric positioning pin, the arc-shaped support is provided with the flexible protection pad, and the gravity center can be adjusted through the balancing weight. During use, components are firstly installed, the height of the limiting plate is finely adjusted, the sleeve is fixed, the balance weight is tried to be hoisted until the levelness reaches the standard, the balance weight is hoisted into the annular cavity assembly for assembly, and finally the components are dismantled to complete hoisting. By optimizing the assembly process and tool design, the assembly time is shortened, the part scratching risk is reduced, the assembly stability and precision are improved, the balancing weight can be flexibly adjusted according to the type of the sleeve, the tool adaptability is high, the sleeve parameters can be accurately controlled, the assembly success rate is increased, and rework is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear equipment installation, and in particular to a casing assembly tool and a use method thereof. Background Art

[0002] In the manufacturing process of modular small nuclear reactors, the assembly of the internal components is a key step, especially the assembly of the casing. The casing is usually divided into two types: long straight tube and short straight tube. The assembly structure of the short straight tube is more complicated. The short straight tube needs to be assembled with the annular cavity assembly, and extend into the pressure vessel (PRV) nozzle to dock with the elbow. Since the single-side gap during docking is very small, the stability, orientation and horizontality of the casing are extremely high.

[0003] The traditional assembly method usually adopts the following steps: First, a small roller frame is hoisted into the platform inside the cylinder, and an adjustable shim is placed under the roller frame. Next, the sleeve is hoisted onto the roller frame, and the assembly position is aligned by adjusting the adjustable shim and rotating the roller frame. Then, the guide rod is screwed in, and finally the sleeve is manually pushed along the guide rod to the assembly position; however, this traditional method has the following disadvantages: 1. Since guide rods are required during the assembly process, the friction between the guide rods and the sleeves can easily cause scratches on the surface of the parts, affecting the service life and safety of the parts; 2. On the roller frame, the position of the sleeve needs to be adjusted repeatedly to align with the assembly position. Since the assembly position requires very high precision, the adjustment process is very difficult and consumes a lot of time and manpower; 3. The process of manually pushing the sleeve along the guide rod to the assembly position is not only time-consuming, but also requires great physical strength, which increases the labor intensity of workers; 4. The traditional method is difficult to ensure the stability of the casing during the assembly process, especially during docking, the casing is prone to deviation, resulting in assembly failure or the need for readjustment. Summary of the invention

[0004] In view of the technical problems existing in the background technology, the present invention provides a casing assembly tool and a method of use, which aims to reduce assembly time, reduce the risk of part scratches, and improve assembly stability and precision by improving the assembly process and tool design. The tool fixes the assembly orientation of the casing through a limit plate and an eccentric positioning pin, and adjusts the position of the counterweight to ensure the assembly level, thereby significantly improving assembly efficiency and quality. In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve: A casing assembly tool comprises a main body bracket, a support frame, an arc-shaped support and a counterweight. The support frame is vertically installed on the side of the main body bracket, the upper end surface of the support frame is fixedly installed with the arc-shaped support, and the other side of the main body bracket is installed with the counterweight. The casing comprises a short straight tube and a long straight tube. During the lifting process of the tool, the short straight tube and the long straight tube are fixed on the arc-shaped support and are lifted by the main body bracket to the mounting hole on the annular cavity assembly for fixation and installation.

[0005] In a preferred solution, a flexible protective pad is adhered to the arc surface of the upper end surface of the arc-shaped support.

[0006] In the preferred solution, connecting flanges are provided at the ends of the medium and short straight tubes and the long straight tubes, and a limit plate is installed on the main support. Limit holes are correspondingly provided on the connecting flange and the limit plate, and the eccentric positioning pin passes through the limit hole to connect and fix the two.

[0007] In a preferred solution, a second strip-shaped hole is opened on the main frame, and the third connecting bolt passes through the limiting plate and the second strip-shaped hole to lock and fix the position of the limiting plate.

[0008] In a preferred embodiment, a right-angle pull plate is installed on the side of the main frame, one side of the right-angle pull plate is connected to the main frame through a first connecting bolt, and the other side of the right-angle pull plate is connected to the end of the counterweight block through a second connecting bolt.

[0009] In a preferred solution, a first strip-shaped hole is opened on the main support, and the first connecting bolt passes through the right-angle pull plate and the first strip-shaped hole to lock and fix the position of the right-angle pull plate.

[0010] In a preferred solution, the lower end surface of the main frame is vertically connected to the base plate, a lifting lug is installed at the upper end surface of the main frame, a mounting bracket is vertically installed on the base plate, and a counterweight is installed at the upper end surface of the mounting bracket.

[0011] In a preferred solution, a third strip-shaped hole is provided at the end surface of the mounting bracket, and a third connecting bolt passes through the third strip-shaped hole and is connected and fixed to the lower end surface of the counterweight block.

[0012] In a preferred embodiment, the method for using the assembly tool comprises the following steps: S1. Install the arc-shaped support on the support frame, and stick a flexible protective pad on the upper arc surface of the arc-shaped support; S2. Place the counterweight on the mounting bracket and initially fix the position of the counterweight with the adjusting bolts at the bottom; S3, installing the limit plate on the side of the main support, and fine-adjusting the height position of the limit plate through the third connecting bolt and the second strip hole; S4. Sleeve the sleeve on the outer side of the arc support, install the eccentric positioning pin into the limiting hole on the connecting flange, and then connect the eccentric positioning pin with the limiting hole on the limiting plate; S5. Test-hang the casing, measure the levelness of the casing, and fine-tune the height and position of the counterweight according to the levelness of the casing until the levelness of the casing meets the requirements; S6, hoisting the assembly tool and the sleeve into the annular cavity assembly, passing the sleeve through the mounting hole, and assembling and fixing the sleeve and the annular cavity assembly; S7. Remove the third connecting bolt and move the assembly tool out of the ring cavity assembly. Finally, remove the eccentric locating pin and the limit plate and complete the lifting.

[0013] In the preferred scheme, in step S2, the number of counterweight blocks to be installed is selected according to the type of sleeve being hoisted: when the hoisted sleeve is a short straight tube, only one lower counterweight block needs to be installed on the mounting bracket; when the hoisted sleeve is a long straight tube, the upper counterweight block needs to be installed on the lower counterweight block, and the two are connected as one through a right-angle pull plate.

[0014] A casing assembly tool and a method of use, the beneficial effects of which include but are not limited to the following: 1. By optimizing the assembly process and tool design, the present invention significantly shortens the assembly time. The traditional method requires repeated adjustment of the position of the sleeve and alignment of the assembly position, while the present invention can quickly and accurately fix the assembly position and levelness of the sleeve through the coordinated use of the limit plate, eccentric positioning pin and counterweight block, avoiding the tedious steps of repeated adjustment, thereby greatly improving the assembly efficiency; 2. The traditional method uses guide rods for assembly, which easily scratches the surface of parts during assembly. The present invention avoids direct friction between the sleeve and the tool by setting a flexible pad on the arc support and using an eccentric positioning pin and a limit plate to fix the sleeve, effectively reducing the risk of scratching parts and ensuring the integrity and service life of the parts; 3. The present invention can flexibly adjust the center of gravity according to the length and weight of the casing through the adjustment function of the counterweight block, ensuring the stability of the casing during the hoisting and assembly process. At the same time, the coordinated use of the limit plate and the eccentric positioning pin can accurately control the assembly orientation and horizontality of the casing, meet the high-precision assembly requirements, and avoid the assembly errors caused by the difficulty of adjustment in the traditional method; 4. The assembly tool of the present invention can flexibly adjust the number and position of the counterweight blocks according to the type of casing (short straight tube or long straight tube), and is suitable for the assembly of casings of different lengths and weights. At the same time, the strip hole design in the tool and the fine-tuning function of the connecting bolts further enhance the adaptability and flexibility of the tool, and can meet the needs of a variety of complex assembly scenarios; 5. Since the tool of the present invention can accurately control the orientation, horizontality and stability of the casing, it avoids the assembly failure problem caused by improper adjustment in the traditional method, significantly improves the success rate of assembly, and reduces the possibility of rework and repeated operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall installation structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention being disassembled; Figure 3 It is an enlarged schematic diagram of the limiting plate structure of the present invention; Figure 4 It is an enlarged schematic diagram of the connection structure of the counterweight block of the present invention; Figure 5 It is a schematic diagram of the enlarged effect of part of the structure of the present invention.

[0016] In the figure: annular cavity assembly 1, short straight tube 2, long straight tube 3, mounting hole 4, main bracket 5, support frame 6, arc support 7, flexible pad 8, counterweight 9, connecting flange 10, limit plate 11, limit hole 12, eccentric locating pin 13, right-angle pull plate 14, first strip hole 15, first connecting bolt 16, second connecting bolt 17, second strip hole 18, third connecting bolt 19, bottom plate 20, mounting bracket 21, third strip hole 22, adjusting bolt 23, and lifting ear 24. DETAILED DESCRIPTION

[0017] like Figure 1 and Figure 2 As shown, a casing assembly tool includes a main frame 5, a support frame 6, an arc support 7 and a counterweight 9. The support frame 6 is vertically installed on the side of the main frame 5, and the arc support 7 is fixedly installed on the upper end surface of the support frame 6. The counterweight 9 is installed on the other side of the main frame 5; the casing includes a short straight tube 2 and a long straight tube 3. During the hoisting process of the tool, the short straight tube 2 and the long straight tube 3 are fixed on the arc support 7, and are hoisted to the mounting hole 4 on the annular cavity component 1 through the main frame 5 for fixing and installation; During use of the device, the specification of the sleeve can be selected by the number of counterweights 9 to be installed. The sleeve is first fixed to the main bracket 5 and the support frame 6, and then the whole set of tools and sleeves are hoisted into the annular cavity assembly 1. After adjusting the horizontality of the sleeve, the sleeve is passed through the mounting hole 4, and finally the entire sleeve is assembled with the annular cavity assembly 1.

[0018] The preferred solution is Figure 2 As shown, a flexible protective pad 8 is pasted on the arc surface of the upper end surface of the arc support 7, which can effectively prevent the arc support 7 from scratching the inner wall of the sleeve during the lifting process.

[0019] The preferred solution is Figure 3As shown, connecting flanges 10 are provided at the ends of the medium and short straight tubes 2 and the long straight tubes 3, and a limit plate 11 is installed on the main support 5. Limit holes 12 are correspondingly opened on the connecting flange 10 and the limit plate 11, and the eccentric positioning pin 13 connects and fixes the two after passing through the limit hole 12; since the assembly position of the medium and short straight tubes 2 and the long straight tubes 3 on the annular cavity assembly 1 is a step surface, the eccentric design of the eccentric positioning pin 13 can prevent the limit plate 11 from exceeding the outer circle of the sleeve flange and interfering with the annular cavity assembly during assembly.

[0020] The preferred solution is Figure 5 As shown, a second strip hole 18 is opened on the main frame 5, and the third connecting bolt 19 penetrates the limit plate 11 and the second strip hole 18 to lock and fix the position of the limit plate 11; through the above structure, the position of the limit plate 11 can be fine-tuned up and down, and then the connection position of the medium and short straight tube 2 and the long straight tube 3 can be adjusted.

[0021] The preferred solution is Figure 3 As shown, a right-angle pull plate 14 is installed on the side of the main support 5, one side of the right-angle pull plate 14 is connected to the main support 5 through a first connecting bolt 16, and the other side of the right-angle pull plate 14 is connected to the end of the counterweight 9 through a second connecting bolt 17.

[0022] The preferred solution is Figure 4 As shown, a first strip hole 15 is opened on the main support 5, and the first connecting bolt 16 passes through the right-angle pull plate 14 and the first strip hole 15 to lock and fix the position of the right-angle pull plate 14; through the above structure, the position of the right-angle pull plate 14 can be fine-tuned up and down, and then the height of the counterweight block 9 can be fine-tuned up and down, and then the horizontality of the sleeve can be adjusted.

[0023] The preferred solution is Figure 4 As shown, the lower end surface of the main bracket 5 is vertically connected to the base plate 20, and a lifting ear 24 is installed at the upper end surface of the main bracket 5. A mounting bracket 21 is vertically installed on the base plate 20, and a counterweight 9 is installed at the upper end surface of the mounting bracket 21; a third strip hole 22 is opened at the end surface of the mounting bracket 21, and the adjusting bolt 23 passes through the third strip hole 22 and is connected and fixed to the lower end surface of the counterweight 9; through the above structure, the horizontal position of the counterweight 9 can be fine-tuned by adjusting the bolt 23, and the horizontality of the sleeve can be further adjusted.

[0024] Embodiment 1: Assembly of short straight tube 2: Step S1: Install the arc support and flexible pad: S1.1. Fix the arc support 7 to the support frame 6 by bolts, ensuring that the center line of the arc surface of the support coincides with the vertical axis of the support frame 6 (error ≤ 1mm); S1.2. Use a 5mm thick silicone flexible pad 8, cut it to cover the upper curved surface of the arc support 7, and fix it with a high temperature resistant adhesive (temperature resistance ≥ 150°C), ensuring that the edge of the pad does not warp to avoid friction when the sleeve slides; Step S2: Installation and preliminary fixation of the counterweight 9: S2.1. According to the weight of the short straight pipe 2 (e.g. 500 kg), select a single lower counterweight block 9 (the weight of the counterweight block is 30%-50% of the weight of the casing, i.e. 150-250 kg); S2.2. Place the lower counterweight 9 in the groove of the mounting bracket 21 and pre-tighten it by using the M20 adjusting bolt 23 at the bottom to make the gap between the counterweight 9 and the mounting bracket 21 ≤ 2 mm to prevent shaking during hoisting; Step S3: Fine adjustment of the height of the limiting plate 11: S3.1. Temporarily fix the limit plate 11 to the second strip hole 18 on the side of the main support 5 by means of the third connecting bolt 19 (the strip hole has a length of 100 mm and a width of 15 mm); S3.2. Use a laser level to measure the center height of the connecting flange 10 of the short straight pipe 2, rotate the third connecting bolt 19, and move the limiting plate 11 up and down along the second strip hole 18 until the coaxiality error between the limiting hole 12 and the flange hole is ≤0.5mm; Step S4: Fixing and azimuth locking of the short straight tube 2: S4.1. Slowly push the short straight tube 2 along the arc surface of the arc support 7 to ensure that the tube body and the flexible pad 8 are completely in contact (contact area ≥ 95%). S4.2. Insert the eccentric end of the eccentric positioning pin 13 into the limiting hole 12 of the connecting flange 10, rotate the pin body to make the eccentric cam press against the hole wall, and then insert the other end of the pin body into the limiting hole 12 of the limiting plate 11 to form a three-point lock (flange-limiting plate-main bracket) to eliminate the assembly angle deviation; Step S5: Trial lifting and level adjustment: S5.1. Lift slowly at a speed of 0.5 m / min through the lifting lug 24, and pause when the tool is 0.5 m off the ground. Use a digital inclinometer to measure the horizontality of the short straight pipe 2. S5.2. If the front end of the short straight tube 2 is tilted downward by more than 0.5°, loosen the adjusting bolt 23 and move the counterweight 9 backward along the mounting bracket 21 by 10-20 mm (the tilt angle can be adjusted by 0.3° for every 10 mm movement); If the rear end tilts downward, move the counterweight forward until the horizontal error is ≤0.2°; Step S6: Hoisting and docking: S6.1. Lift the short straight tube 2 into the annular cavity assembly 1 at a speed of 1 m / min, and use a laser guide to align the axis of the sleeve with the center of the mounting hole 4 (deviation ≤ 1 mm); S6.2. After the front end of the short straight pipe 2 is inserted into the PRV nozzle, the sleeve is slowly tightened by the external equipment of the hydraulic jacking device until the gap between the flange end face and the sealing surface of the ring cavity component 1 is ≤0.1mm, and then the flange bolts are tightened (the torque value is set according to the process requirements, for example, 800N·m); Step S7: Tool disassembly and resetting: S7.1. Remove the third connecting bolt 19 and use a crane to move the main frame 5 and the support frame 6 out of the annular cavity assembly 1 as a whole; S7.2. After removing the eccentric locating pin 13, check that there are no scratches on the flange connection surface of the short straight pipe 2, and record the horizontality data after assembly as a reference for subsequent assembly.

[0025] Example 2: Assembly of the long straight tube 3 (differentiated step description): Step S2: stacking and connecting multi-level counterweight blocks: S2.1, the weight of the long straight pipe 3 is relatively large (e.g. 800kg), and an upper counterweight block 9 needs to be superimposed on the lower counterweight block 9, and the total counterweight is 40% of the weight of the casing (i.e. 320kg); S2.2. Fix the vertical edge of the right-angle pull plate 14 to the first strip hole 15 of the main support 5 through the first connecting bolt 16 (the strip hole length is 150 mm); The horizontal edge is connected to the threaded hole on the side of the upper counterweight 9 through the second connecting bolt 17 to form an "L"-shaped rigid support to prevent the counterweight from shaking; Step S5: Horizontal compensation of long straight pipe: S5.1. Since the long straight pipe 3 is relatively long (e.g. 6m), it is easy to cause horizontal deviation due to deflection during hoisting. If the deflection of the middle part of the pipe body is greater than 2mm after the trial hoisting, it is necessary to add a shim under the counterweight 9. Each 1mm shim can compensate for 0.5mm deflection. S5.2. By moving the positions of the upper and lower counterweights 9 at the same time, adjust the overall center of gravity of the tool to coincide with the center of gravity of the casing to ensure that there is no tilt during lifting; Step S6: Butt protection of long straight pipes: S6.1. Install a nylon guide sleeve (not shown) at the front end of the long straight pipe 3 to avoid scratches when it contacts the inner wall of the PRV nozzle; S6.2. When docking, adopt a segmented jacking strategy: first push in the front end 200mm, confirm that the horizontality has not changed, and then complete the entire assembly with a feed amount of 100mm each time to avoid one-time jacking causing the pipe body to deviate.

[0026] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from all points of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention; any reference numerals in the claims should not be regarded as limiting the claims involved.

Claims

1. A casing assembly tool, comprising a main frame (5), a support frame (6), an arc-shaped support (7) and a counterweight (9), characterized in that: A support frame (6) is vertically mounted on the side of the main frame (5); an arc-shaped support (7) is fixedly mounted on the upper end surface of the support frame (6); a counterweight (9) is mounted on the other side of the main frame (5); the sleeve comprises a short straight tube (2) and a long straight tube (3); during the lifting process of the tool, the short straight tube (2) and the long straight tube (3) are fixed on the arc-shaped support (7) and are lifted through the main frame (5) to the mounting hole (4) on the annular cavity component (1) for fixing and mounting.

2. The casing assembly tool according to claim 1, characterized in that: A flexible protective pad (8) is adhered to the arc surface of the upper end surface of the arc-shaped support (7).

3. The casing assembly tool according to claim 1, characterized in that: The ends of the medium and short straight tube (2) and the long straight tube (3) are provided with connecting flanges (10), and a limiting plate (11) is installed on the main frame (5). The connecting flange (10) and the limiting plate (11) are provided with limiting holes (12) correspondingly, and the eccentric positioning pin (13) passes through the limiting hole (12) to connect and fix the two.

4. The casing assembly tool according to claim 3, characterized in that: A second strip-shaped hole (18) is formed on the main frame (5), and the third connecting bolt (19) penetrates the limiting plate (11) and the second strip-shaped hole (18) to lock and fix the position of the limiting plate (11).

5. The casing assembly tool according to claim 1, characterized in that: A right-angle pull plate (14) is installed on the side of the main frame (5); one side of the right-angle pull plate (14) is connected to the main frame (5) via a first connecting bolt (16); and the other side of the right-angle pull plate (14) is connected to the end of the counterweight (9) via a second connecting bolt (17).

6. The casing assembly tool according to claim 5, characterized in that: A first strip-shaped hole (15) is formed on the main frame (5), and a first connecting bolt (16) penetrates the right-angle pull plate (14) and the first strip-shaped hole (15) to lock and fix the position of the right-angle pull plate (14).

7. The casing assembly tool according to claim 1, characterized in that: The lower end surface of the main frame (5) is vertically connected to the bottom plate (20), a lifting lug (24) is installed at the upper end surface of the main frame (5), a mounting frame (21) is vertically installed on the bottom plate (20), and a counterweight (9) is installed at the upper end surface of the mounting frame (21).

8. The casing assembly tool according to claim 7, characterized in that: A third strip-shaped hole (22) is formed at the end surface of the mounting bracket (21), and a third connecting bolt (19) passes through the third strip-shaped hole (22) and is connected and fixed to the lower end surface of the counterweight (9).

9. The casing assembly tool according to any one of claims 1 to 8, characterized in that: The method of using the assembly tool includes the following steps: S1, installing the arc-shaped support (7) on the support frame (6), and pasting a flexible protective pad (8) on the upper arc surface of the arc-shaped support (7); S2, placing the counterweight (9) on the mounting bracket (21), and then preliminarily fixing the position of the counterweight (9) by means of the adjusting bolt (23) at the bottom; S3, installing the limit plate (11) on the side of the main frame (5), and fine-adjusting the height position of the limit plate (11) through the third connecting bolt (19) and the second strip hole (18); S4, sleeve the sleeve onto the outer side of the arc-shaped support (7), install the eccentric positioning pin (13) into the limiting hole (12) on the connecting flange (10), and then connect the eccentric positioning pin (13) with the limiting hole (12) on the limiting plate (11); S5, test-hanging the casing, measuring the horizontality of the casing, and fine-adjusting the height and position of the counterweight (9) according to the horizontality of the casing until the horizontality of the casing meets the requirements; S6, hoisting the assembly tool and the sleeve into the annular cavity assembly (1), passing the sleeve through the mounting hole (4), and assembling and fixing the sleeve and the annular cavity assembly (1); S7. Remove the third connecting bolt (19), and move the assembly tool out of the annular cavity assembly (1). Finally, remove the eccentric positioning pin (13) and the limit plate (11) and complete the lifting.

10. The casing assembly tool according to claim 9, characterized in that: in step S2, the number of counterweights (9) to be installed is selected according to the type of the sleeve to be hoisted: 10.

1. When the sleeve to be hoisted is a short straight pipe (2), only one lower counterweight (9) needs to be installed on the mounting bracket (21); 10.

2. When the sleeve to be hoisted is a long straight tube (3), the upper counterweight block (9) needs to be installed on the lower counterweight block (9), and the two need to be connected as one through a right-angle pull plate (14).

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