A combined variable diameter device for rounding large rings and its use method

Abstract

The present invention relates to a combined variable diameter device for rounding large rings and a method for using the same, belonging to the technical field of devices for rounding thin-walled rings. The combined variable diameter device comprises a plurality of main units and a jacking mechanism corresponding to the main units. The cross section of the main unit is trapezoidal or fan-shaped. A clamping protrusion is provided on one side of the main unit, and key slots are provided on both sides of the clamping protrusion in the vertical direction. A clamping slot is provided on the other side of the main unit, and key slots are provided on both sides of the clamping slot in the vertical direction. The sizes of the clamping slot and the clamping protrusion are adapted. A plurality of main units are connected in sequence to form a load-bearing frame. A through hole is provided in the center of the main unit, and a threaded hole is provided on the inner wall of the through hole. The jacking mechanism comprises an electric servo jacking cylinder, and the cylinder barrel of the electric servo jacking cylinder is installed on the through hole. The present invention adopts a combined load-bearing frame method, so that the annular reinforcement rib can be easily installed on the ring with a certain degree of deformation, which greatly simplifies the manufacturing process and improves the manufacturing speed and product quality.

Description

Technical Field

[0001] The invention relates to a combined variable diameter device for rounding large rings and a use method thereof, belonging to the technical field of rounding devices for thin-walled rings. Background Art

[0002] Traditionally, large rings are manufactured by welding rolled plates together. This method is complex, has a long manufacturing cycle, and results in numerous welds and poor reliability. Large ring rolling mills are now available in China, capable of rolling rings exceeding 15m in diameter and 3m in height. These mills can replace the traditional large rings manufactured by welding rolled plates together, reducing welds, improving reliability, and significantly shortening the manufacturing cycle. Metal rings produced using large ring rolling mills can be used for large pressure storage tank shells, hot press cured tank shells, underwater pressure chamber shells, large vacuum tank shells, and more. To increase the pressure-bearing capacity of these parts, several annular reinforcement ribs are required to be added to the inner or outer walls of the shell, so that the annular reinforcement ribs play the primary load-bearing role and the shell wall plays the primary sealing role. The existing method of processing annular reinforcement ribs on the inner or outer wall of the shell of a large ring is to first fix several annular reinforcement ribs to a special bracket, then adhere the arc plate after rolling and coiling from the outside, and finally weld together to form a pressure-bearing structure of the shell wall with annular reinforcement ribs. This method has a complex manufacturing process, is time-consuming, and has high manufacturing costs. There are many splicing welds and high welding stress, which seriously affects its sealing and overall pressure-bearing capacity. Summary of the Invention

[0003] The present invention aims to solve the problems of existing large ring reinforcement ribs, such as complex installation process, time-consuming, high manufacturing cost, many splicing welds, and high welding stress, and provides a combined variable diameter device for rounding large rings and a method for using the same.

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A combined variable diameter device for rounding large rings comprises a plurality of main units and a jacking mechanism arranged corresponding to the main units, the cross section of the main unit is trapezoidal or fan-shaped, a clamping protrusion is provided on one side of the main unit, and key grooves are provided on both sides of the clamping protrusion in the vertical direction, a clamping slot is provided on the other side of the main unit, and key grooves are provided on both sides of the clamping slot in the vertical direction, and the clamping slot is adapted to the size of the clamping protrusion, a plurality of the main units are connected in sequence to form a load-bearing frame, a through hole is provided in the center of the main unit, and a threaded hole is provided on the inner wall of the through hole; the jacking mechanism comprises an electric servo top cylinder, and the cylinder barrel of the electric servo top cylinder is installed on the through hole.

[0005] On the basis of the above technical solution, the present invention can also make the following improvements:

[0006] Furthermore, bidirectional connection units and / or unidirectional connection units are provided between the main units.

[0007] The beneficial effect of adopting the above-mentioned further technical solution is that the load-bearing frame structure is composed of the main unit, the two-way connection unit and the one-way connection unit, which can be combined in different ways. The load-bearing frames of different sizes can be combined with the least basic units to match the rings of different diameters, thereby greatly reducing the total investment cost.

[0008] Furthermore, the top surface and one side surface of the bidirectional connection unit are provided with a locking protrusion, and key grooves are provided on both sides of the locking protrusion in the vertical direction. The bottom surface and another side surface of the bidirectional connection unit are provided with a locking groove, and key grooves are provided on both sides of the locking groove in the vertical direction. A through hole is provided in the center of the bidirectional connection unit, and a threaded hole is provided on the inner wall of the through hole, and the extending mechanism is installed on the through hole.

[0009] The beneficial effect of adopting the above further technical solution is that two adjacent main units can be connected through the two side surfaces of the bidirectional connection unit, or two adjacent main units can be connected through the top and bottom surfaces, so that two load-bearing frames of different sizes can be combined.

[0010] Furthermore, a latching protrusion is provided on one side of the one-way connection unit, and key grooves are provided on both sides of the latching protrusion in the vertical direction; another side of the one-way connection unit is provided with a latching slot, and key grooves are provided on both sides of the latching slot in the vertical direction.

[0011] The beneficial effect of adopting the above further technical solution is that two adjacent main units can be connected by a one-way connection unit, or by a combination of a one-way connection unit and a two-way link unit, so that two load-bearing frames of different sizes can be combined.

[0012] Furthermore, the main unit, the bidirectional connection unit, and the unidirectional connection unit are all hollow structures, and the hollow structure reduces the overall weight of the load-bearing frame.

[0013] Furthermore, an arched top block is provided at the end of the piston rod of the electric servo top cylinder, and the arched top block is pressed against the shell wall of the ring component, so that the ring component can be better fitted.

[0014] Furthermore, it also includes a control system, which is connected to the electric servo top cylinder signal and can control the single movement or multiple linkages of the electric servo top cylinder.

[0015] The present invention also relates to a method for using the combined variable diameter device for rounding a large ring as described above, comprising the following steps:

[0016] (1) Determine the installation position of the reinforcing rib on the ring. If the reinforcing rib needs to be installed on the inner wall of the ring, the inner top type is selected, that is, the combined variable diameter device is used to perform rounding on the inside of the ring; if the reinforcing rib needs to be installed on the outer wall of the ring, the outer top type is selected, that is, the combined variable diameter device is used to perform rounding on the outside of the ring;

[0017] (2) According to the size of the ring to be rounded and the rounding method to be used, a combination of the main unit, the two-way connection unit, and the one-way connection unit is selected to form a load-bearing frame;

[0018] (3) Install an electric servo top cylinder at the through hole, and install an arched top block at the end of the piston rod of the electric servo top cylinder;

[0019] (4) Place the bearing frame at the top of the ring, adjust the bearing frame and the ring to be concentric, and control the electric servo top cylinder to gradually extend the piston rod so that the arched top block fits the shell wall of the ring;

[0020] (5) Two electric servo top cylinders arranged opposite to each other form a group. The long and short semi-axes of the ring are determined by confirming the extension of the piston rod of each group of electric servo top cylinders, and the extension and contraction of the piston rod of each electric servo top cylinder is continuously fine-tuned to make the ring in a regular circular state;

[0021] (6) Place the annular reinforcement rib, and the control system controls the piston rod of the electric servo top cylinder to retract, lowering the load-bearing frame. The control system then synchronously extends the piston rods of all electric servo top cylinders by a distance equal to step (5), so that the reinforcement rib can be smoothly lowered. Repeat this process several times until the reinforcement rib finally falls into the corresponding installation position.

[0022] (7) After the reinforcement ribs are welded and fixed, the control system controls the piston rod of the electric servo top cylinder to retract, and the load-bearing frame is reset to the top position of the ring. Then the next annular reinforcement rib is installed in the same way, and finally all the reinforcement ribs are successfully installed.

[0023] Furthermore, in step (5), after the ring is rounded, the piston rod of the electric servo top cylinder continues to extend, causing a small amount of elastic deformation of the ring as a whole.

[0024] The beneficial effect of adopting the above-mentioned further technical solution is that the ring shell wall produces a small amount of elastic deformation, so that the ring shell wall is appropriately increased, the installation gap is increased, and the installation of the annular reinforcement rib is facilitated. After installation, the force is unloaded, and the ring shell wall rebounds to its original size and maintains a fit with the annular reinforcement rib.

[0025] The advantages of this invention are that it uses a combined load-bearing frame to round the ring, allowing the annular reinforcement to be easily installed on rings with a certain degree of deformation, significantly simplifying the manufacturing process and improving manufacturing speed and product quality. The use of electric servo cylinders allows for precise control of the extension and contraction of each cylinder, eliminating the need for a hydraulic station. This facilitates both synchronous control of multiple cylinders and independent control of a single cylinder, making it quick and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the three-dimensional structure of the main unit;

[0027] Figure 2 A top view of the main unit;

[0028] Figure 3 A top view of the load-bearing frame of Example 1;

[0029] Figure 4 Schematic diagram of the three-dimensional structure of the bidirectional connection unit;

[0030] Figure 5 is a schematic diagram of the three-dimensional structure of the bidirectional connection unit from another angle;

[0031] Figure 6 A top view of the load-bearing frame of Example 2;

[0032] Figure 7 A top view of the load-bearing frame of Example 3;

[0033] Figure 8 A top view of the load-bearing frame and the extension mechanism of Example 3;

[0034] Figure 9 Schematic diagram of the three-dimensional structure of the load-bearing frame and the jacking mechanism of Example 3;

[0035] Figure 10 Schematic diagram of the three-dimensional structure of the load-bearing frame and the jacking mechanism during the rounding process of Example 3;

[0036] Figure 11 A top view of the rounding process of the load-bearing frame and the jacking mechanism of Example 3;

[0037] Figure 12 A top view of the load-bearing frame of Example 4;

[0038] Figure 13 A top view of the rounding process of the load-bearing frame and the jacking mechanism of Example 4;

[0039] Figure 14 Schematic diagram of the three-dimensional structure of the load-bearing frame and the jacking mechanism during the rounding process of Example 4;

[0040] Figure 15A top view of the load-bearing frame of Example 5;

[0041] Figure 16 Schematic diagram of the three-dimensional structure of the one-way connection unit;

[0042] Figure 17 This is a schematic diagram of the three-dimensional structure of the one-way connection unit from another angle.

[0043] The accompanying drawings are marked as follows: 1. Main unit; 1.1. Main unit latch; 1.2. Main unit slot; 1.3. Main unit keyway; 1.4. Main unit through hole; 2. Two-way connection unit; 2.1. Two-way connection unit latch; 2.2. Two-way connection unit slot; 2.3. Two-way connection unit keyway; 2.4. Two-way connection unit through hole; 3. One-way connection unit; 3.1. One-way connection unit latch; 3.2. One-way connection unit slot; 3.3. One-way connection unit keyway; 4. Electric servo top cylinder; 4.1. Piston rod; 5. Arched top block; 6. Ring. DETAILED DESCRIPTION

[0044] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0045] Example 1

[0046] See also Figure 1-3 , a combined variable diameter device for correcting large ring parts, comprising multiple main units 1 and a jacking mechanism corresponding to the main units 1, the cross section of the main unit 1 being trapezoidal or fan-shaped, a main unit convex 1.1 being provided on one side of the main unit 1, and main unit key grooves 1.3 being provided on both sides of the main unit convex 1.1 in the vertical direction, a main unit slot 1.2 being provided on the other side of the main unit 1, main unit key grooves 1.3 being provided on both sides of the main unit slot 1.2 in the vertical direction, the main unit slot 1.2 being adapted to the size of the main unit convex 1.1, a plurality of the main units 1 being connected in sequence to form a load-bearing frame, a main unit through hole 1.4 being provided in the center of the main unit 1, and a threaded hole being provided on the inner wall of the main unit through hole 1.4; the jacking mechanism comprising an electric servo jacking cylinder 4, the cylinder of the electric servo jacking cylinder 4 being installed on the main unit through hole 1.4, the end of the cylinder being provided with a flange hole, the flange hole corresponding to the threaded hole, and the cylinder being fixed by screws. The main unit 1 is a hollow structure to reduce the weight of the bearing frame. The end of the piston rod 4.1 of the electric servo jacking cylinder 4 is provided with an arched jacking block 5. A control system is also included, and the control system is connected to the electric servo jacking cylinder 4 by signal.

[0047] See also Figure 3In this embodiment, there are 8 main units 1, and the 8 main units 1 are connected in sequence to form a load-bearing frame with a diameter of 6m. The main unit clamping protrusions 1.1 between adjacent main units 1 are clamped in the main unit clamping grooves 1.2, and the main unit key grooves 1.3 between adjacent main units 1 are opposite to each other. The square key is inserted into the main unit key groove 1.3 to limit the main unit 1 in the vertical direction to ensure the stability of the load-bearing frame in the vertical direction.

[0048] The method for using the combined variable diameter device of this embodiment for rounding a large ring comprises the following steps:

[0049] (1) Determine the installation position of the reinforcing rib on the ring. If the reinforcing rib needs to be installed on the inner wall of the ring, the inner top form is selected, that is, the combined variable diameter device is used to perform rounding inside the ring, and the circumference of the load-bearing frame for installing the reinforcing rib in the inner top form is smaller than the circumference of the reinforcing rib; if the reinforcing rib needs to be installed on the outer wall of the ring, the outer top form is selected, that is, the combined variable diameter device is used to perform rounding outside the ring, and the circumference of the load-bearing frame for installing the reinforcing rib in the outer top form is larger than the circumference of the reinforcing rib; the reinforcing rib of this embodiment is installed on the inner wall of the ring, using the inner top form;

[0050] (2) According to the ring member of this embodiment, the diameter is 7-9m, and the reinforcement ribs are installed in the inner top form. Therefore, 8 main units are used to form a load-bearing frame with a maximum diameter of 6m;

[0051] (3) Install an electric servo top cylinder at the through hole of the main unit, and install an arched top block at the end of the piston rod of the electric servo top cylinder;

[0052] (4) The load-bearing frame is hoisted and placed on the top of the ring. The load-bearing frame and the ring are adjusted to be concentric. The control system controls the electric servo top cylinder to gradually extend the piston rod so that the arched top block fits the shell wall of the ring.

[0053] (5) Two electric servo top cylinders arranged opposite to each other form a group. The long and short semi-axes of the ring are determined by confirming the extension of the piston rod of each group of electric servo top cylinders, and the extension and contraction of the piston rod of each electric servo top cylinder is continuously fine-tuned to make the ring in a regular circular state. Then, the piston rod of the electric servo top cylinder continues to extend, so that the ring as a whole undergoes a small amount of elastic deformation, so as to increase the installation gap and facilitate the installation of the reinforcement ribs.

[0054] (6) Place the annular reinforcement rib, and the control system controls the piston rod of the electric servo top cylinder to retract, lowering the load-bearing frame. The control system then synchronously extends the piston rods of all electric servo top cylinders by a distance equal to step (5), so that the reinforcement rib can be smoothly lowered. Repeat this process several times until the reinforcement rib finally falls into the corresponding installation position.

[0055] The reason for taking the above steps is that when the first annular reinforcement rib needs to be placed from the top of the ring, the top of the ring is made into a regular circular state within a certain range by the bearing frame and the jacking mechanism, and a small amount of elastic deformation is generated as a whole, but the bottom of the ring is still in its original non-circular state. Therefore, after the annular reinforcement rib is placed in the top position inside the ring, the bearing frame needs to be dropped a certain distance to straighten the ring below the position of the reinforcement rib at this time, and a small amount of elastic deformation is generated again before the annular reinforcement rib can continue to move downward until it moves to the corresponding installation position;

[0056] (7) Weld the reinforcement ribs. After the reinforcement ribs are fixed, the control system controls the piston rod of the electric servo top cylinder to retract, and the load-bearing frame passes through the installed reinforcement ribs and resets to the top position of the ring. Then, the next annular reinforcement rib is installed in the same way, and finally all the reinforcement ribs are successfully installed.

[0057] Example 2

[0058] See also Figure 4-6 In this embodiment, based on the scheme of embodiment 1, a two-way connection unit 2 is further provided between the main units 1, and the two-way connection unit is a hollow structure. The top surface and one side surface of the two-way connection unit 2 are provided with a two-way connection unit clamping protrusion 2.1, and two sides of the two-way connection unit clamping protrusion 2.1 are provided with two-way connection unit key grooves 2.3 in the vertical direction. The bottom surface and the other side surface of the two-way connection unit 2 are provided with a two-way connection unit clamping slot 2.2, and two sides of the two-way connection unit clamping slot 2.2 are provided with two-way connection unit key grooves 2.3 in the vertical direction. A two-way connection unit through hole 2.4 is provided in the center of the two-way connection unit 2, and a threaded hole is provided on the inner wall of the two-way connection unit through hole 2.4. The electric servo top cylinder 4 is installed on the two-way connection unit through hole 2.4, and its installation method is the same as that of the electric servo top cylinder 4 on the main unit 1.

[0059] See also Figure 6 In this embodiment, the main units 1 are provided with 8, and the two-way connection units 2 are provided with 8. The two-way connection units 2 are installed vertically, that is, the top and bottom surfaces of the two-way connection units 2 are in contact with the side surfaces of the main unit 1 respectively, and the two-way connection unit clamping protrusions 2.1 are clamped in the main unit clamping slots 1.2. The main unit clamping protrusions 1.1 are clamped in the two-way connection unit clamping slots 2.2 to form a load-bearing frame with a maximum diameter of 9m. The adjacent main unit key slots 1.3 are opposite to the two-way connection unit key slots 2.3. The square keys are inserted to limit the position in the vertical direction to ensure the stability of the load-bearing frame in the vertical direction.

[0060] The reinforcing ribs in this embodiment are installed in a ring with a diameter of 10-11m using an inner top installation method. The installation method is the same as that in Example 1 and will not be repeated here.

[0061] Example 3

[0062] See also Figure 7-11 This embodiment differs from Example 2 in that the bidirectional connection unit 2 is installed horizontally, with the side surfaces of the bidirectional connection unit 2 contacting the side surfaces of the main unit 1. The load-bearing frame of this embodiment has a maximum diameter of 11 mm. The adjacent main unit keyways 1.3 and bidirectional connection unit keyways 2.3 face each other, and square keys are inserted to provide vertical positioning, ensuring vertical stability of the load-bearing frame.

[0063] See also Figure 10-11 In this embodiment, the reinforcing ribs are installed in a ring with a diameter of 12-14m using an inner top installation method. The installation method is the same as that in embodiment 1 and will not be repeated here.

[0064] Example 4

[0065] See also Figure 12-14 In this embodiment, based on the solution of embodiment 2, a bidirectional connection unit 2 and a unidirectional connection unit 3 are provided between the main units 1. Figure 16-17 The one-way connection unit 3 is a hollow structure, and a one-way connection unit bulge 3.1 is provided on one side of the one-way connection unit 3, and one-way connection unit key grooves 3.3 are provided on both sides of the one-way connection unit bulge 3.1 in the vertical direction. The other side of the one-way connection unit 3 is provided with a one-way connection unit slot 3.2, and one-way connection unit key grooves 3.3 are provided on both sides of the one-way connection unit slot 3.2 in the vertical direction. In this embodiment, there are 8 main units 1, 8 bidirectional connection units 2, and 16 unidirectional connection units 3. One-way connection units 3 are provided on both sides of the main unit 1, and a bidirectional connection unit 2 is provided between two adjacent one-way connection units 3. The bidirectional connection units 2 are vertically arranged, that is, the top and bottom surfaces of the bidirectional connection units 2 are in contact with the side surfaces of the one-way connection units 3 respectively, and the one-way connection unit card protrusion 3.1 is clamped in the main unit card slot 1.2 or the bidirectional connection unit card slot 2.2 adjacent to it, and the main unit card protrusion 1.1 or the bidirectional connection unit card protrusion 2.1 is clamped in the one-way connection unit card slot 3.2 connected to it, forming a load-bearing frame with a maximum diameter of 14m.

[0066] In this embodiment, the reinforcing ribs are installed outside the ring with a diameter of 13m using an external top installation method.

[0067] See also Figure 13-14 The method for using the combined variable diameter device of this embodiment for rounding a large ring includes the following steps:

[0068] (1) The reinforcement ribs are designed to be externally topped. The perimeter of the load-bearing frame in this embodiment is greater than the perimeter of the reinforcement ribs.

[0069] (2) According to this embodiment, the ring member has a diameter of 13m and the reinforcement ribs are installed in the form of an external top. Therefore, 8 main units, 8 vertically installed two-way connection units and 16 one-way connection units are used to form a load-bearing frame with a maximum diameter of 14m;

[0070] (3) Install an electric servo top cylinder at the through hole of the main unit, and install an arched top block at the end of the piston rod of the electric servo top cylinder;

[0071] (4) The load-bearing frame is hoisted and placed on the top of the ring. The load-bearing frame and the ring are adjusted to be concentric. The control system controls the electric servo top cylinder to gradually extend the piston rod so that the arched top block fits the shell wall of the ring.

[0072] (5) Two electric servo top cylinders arranged opposite to each other form a group. The long and short semi-axes of the ring are determined by confirming the extension of the piston rod of each group of electric servo top cylinders, and the extension and contraction of the piston rod of each electric servo top cylinder is continuously fine-tuned to make the ring in a regular circular state. Then, the piston rod of the electric servo top cylinder continues to extend, so that the ring as a whole undergoes a small amount of elastic deformation, so as to increase the installation gap and facilitate the installation of the reinforcement ribs.

[0073] (6) Place the annular reinforcement rib, and the control system controls the piston rod of the electric servo top cylinder to retract, lowering the load-bearing frame. The control system then synchronously extends the piston rods of all electric servo top cylinders by a distance equal to step (5), so that the reinforcement rib can be smoothly lowered. Repeat this process several times until the reinforcement rib finally falls into the corresponding installation position.

[0074] (7) After the reinforcement ribs are welded and fixed, the control system controls the piston rod of the electric servo top cylinder to retract, and the load-bearing frame is reset to the top position of the ring. Then the next annular reinforcement rib is installed in the same way, and finally all the reinforcement ribs are successfully installed.

[0075] Example 5

[0076] See also Figure 15 The difference between this embodiment and embodiment 4 is that the bidirectional connection unit 2 of this embodiment is installed in a flat manner, that is, the side of the bidirectional connection unit 2 contacts the side of the unidirectional connection unit 3. The maximum diameter of the load-bearing frame of this embodiment is 16.5m.

[0077] The reinforcing ribs in this embodiment are installed in a ring with a diameter of 16m using an external top installation method. The installation method is the same as that in Example 4 and will not be repeated here.

[0078] The main unit 1, the bidirectional connection unit 2 and the unidirectional connection unit 3 of the present invention are matched in different combinations to install the load-bearing frame required for the installation of reinforcing ribs on ring parts with a diameter of 7m to 16m. The annular reinforcing ribs can be easily installed into large thin-walled ring parts with a certain degree of deformation, which greatly simplifies the manufacturing process and improves the manufacturing speed and product quality.

[0079] 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 principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A combined variable diameter device for rounding large rings, characterized in that: It comprises a plurality of main units and a jacking mechanism corresponding to the main units, wherein the cross section of the main unit is trapezoidal or fan-shaped, a clamping protrusion is provided on one side of the main unit, and key slots are provided on both sides of the clamping protrusion in the vertical direction, a clamping slot is provided on the other side of the main unit, and key slots are provided on both sides of the clamping slot in the vertical direction, and the sizes of the clamping slots and the clamping protrusions are adapted, and a plurality of the main units are connected in sequence to form a load-bearing frame, a through hole is provided in the center of the main unit, and a threaded hole is provided on the inner wall of the through hole; the jacking mechanism comprises an electric servo jacking cylinder, and the cylinder barrel of the electric servo jacking cylinder is installed on the through hole; A bidirectional connection unit and / or a unidirectional connection unit are further provided between the main units; The top surface and one side surface of the bidirectional connection unit are provided with a clamping protrusion, and key grooves are provided on both sides of the clamping protrusion in the vertical direction. The bottom surface and the other side surface of the bidirectional connection unit are provided with a clamping slot, and key grooves are provided on both sides of the clamping slot in the vertical direction. A through hole is provided in the center of the bidirectional connection unit, and a threaded hole is provided on the inner wall of the through hole. The extension mechanism is installed on the through hole; A locking protrusion is provided on one side of the one-way connection unit, and key grooves are provided on both sides of the locking protrusion in the vertical direction. Another side of the one-way connection unit is provided with a locking slot, and key grooves are provided on both sides of the locking slot in the vertical direction.

2. The combined variable diameter device for rounding large rings according to claim 1, characterized in that: The main unit, the bidirectional connection unit, and the unidirectional connection unit are all hollow structures.

3. The combined variable diameter device for rounding large rings according to claim 1, characterized in that: The piston rod end of the electric servo jacking cylinder is provided with an arched jacking block.

4. The combined variable diameter device for rounding large rings according to claim 1, characterized in that: It also includes a control system, which is connected to the electric servo top cylinder signal.

5. A method for using the combined variable diameter device for rounding large rings according to any one of claims 1 to 4, characterized in that: The following steps are involved: (1) Determine the installation position of the reinforcing rib on the ring. If the reinforcing rib needs to be installed on the inner wall of the ring, the inner top type is selected, that is, the combined variable diameter device is used to perform rounding on the inside of the ring; if the reinforcing rib needs to be installed on the outer wall of the ring, the outer top type is selected, that is, the combined variable diameter device is used to perform rounding on the outside of the ring; (2) According to the size of the ring to be rounded and the rounding method to be used, a combination of the main unit, the two-way connection unit, and the one-way connection unit is selected to form a load-bearing frame; (3) Install an electric servo top cylinder at the through hole, and install an arched top block at the end of the piston rod of the electric servo top cylinder; (4) Place the bearing frame at the top of the ring, adjust the bearing frame and the ring to be concentric, and control the electric servo top cylinder to gradually extend the piston rod so that the arched top block fits the shell wall of the ring; (5) Two electric servo top cylinders arranged opposite to each other form a group. The long and short semi-axes of the ring are determined by confirming the extension of the piston rod of each group of electric servo top cylinders, and the extension and contraction of the piston rod of each electric servo top cylinder is continuously fine-tuned to make the ring in a regular circular state; (6) Place the annular reinforcement rib, and the control system controls the piston rod of the electric servo top cylinder to retract, lowering the load-bearing frame. The control system then synchronously extends the piston rods of all electric servo top cylinders by a distance equal to step (5), so that the reinforcement rib can be smoothly lowered. Repeat this process several times until the reinforcement rib finally falls into the corresponding installation position. (7) After the reinforcement ribs are welded and fixed, the control system controls the piston rod of the electric servo top cylinder to retract, and the load-bearing frame is reset to the top position of the ring. Then the next annular reinforcement rib is installed in the same way, and finally all the reinforcement ribs are successfully installed.

6. The method of use according to claim 5, characterized in that: In the step (5), after the ring is rounded, the piston rod of the electric servo top cylinder continues to extend, causing a small amount of elastic deformation of the ring as a whole.

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