Horizontal C-shaped clamping lifting appliance for metal material outer culvert casing and assembly method of horizontal C-shaped clamping lifting appliance

Abstract

The invention discloses a metal material outer culvert casing horizontal C-shaped clamping lifting appliance and an assembling method thereof, a main beam is of a C-shaped welding frame structure, the size of a lower C shape of the main beam is determined according to the outer diameter size of a rear mounting edge of an outer culvert casing to be assembled, and the total height of the main beam is determined according to the height of a part connected with the rear end face of the outer culvert casing; the lifting lug is fixed at the upper part of the main beam through a hexagon head bolt a, a flat washer and a hexagon nut; the balancing weights are movably arranged on the main beam and are fixed in balancing weight holes in different positions of the main beam through hexagonal head bolts b; the equipment nameplate is fixed on the main beam; and the hexagonal head bolts c and the flat washers are used for fixing the outer culvert casing rear mounting edge in the circumferential bolt holes of the main beam. According to the method, safe and stable assembly of the heavy-weight metal outer culvert casing can be guaranteed, and the part cost loss caused by collision, scrapping and replacement of adjacent parts due to control errors when a metal outer culvert is assembled on an engine is effectively avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero-engine assembly, in particular to a horizontal C-shaped clamping lifting appliance for a metal outer-duct casing and an assembly method thereof. BACKGROUND

[0002] As a core transition structure of an aero-engine, the outer-duct casing mainly undertakes the dual functions of aerodynamic duct conversion and structural load bearing. Firstly, it efficiently guides the low-temperature airflow from the intermediate casing to the turbine rear casing to form an outer-duct airflow passage, thereby ensuring the optimization of the duct ratio and the generation of thrust. Secondly, it serves as a load-bearing frame to transfer the load of the low-pressure rotor and support the accessory pipelines. The outer-duct casing is usually a segmented shell, with the front segment flange bolted to the outlet of the intermediate casing and the rear segment flange bolted to the front mounting edge of the turbine rear casing.

[0003] The outer-duct casing is usually assembled after the formation of the core engine unit body and before the installation of the turbine rear casing. When a common composite material outer-duct casing is used, its self-weight is relatively light, so it can be lifted using a conventional lifting appliance and adjusted in position with the aid of manual assistance to achieve assembly. However, when a metal outer-duct casing is used to meet the performance, structural, and strength requirements of the engine, the self-weight of the metal outer-duct casing increases significantly. Using a conventional lifting appliance is difficult to adjust the position, and when the lifting appliance is installed at the center of the casing or cannot maintain the horizontal state of the outer-duct casing, it is easy to interfere with other components of the engine during installation, resulting in the failure of the outer-duct casing to be assembled. SUMMARY

[0004] To solve the above technical problems, the present application provides a horizontal C-shaped clamping lifting appliance for a metal outer-duct casing and an assembly method thereof. The specific technical solutions are as follows: A horizontal C-shaped clamping lifting appliance for a metal outer-duct casing, comprising a main beam, an ear, a counterweight, an equipment nameplate, and a connecting piece. The main beam is a C-shaped welded frame structure, with the size of the lower C-shaped part determined according to the outer diameter of the rear mounting edge of the outer-duct casing to be assembled, and the total height of the main beam determined according to the height of the part connected to the rear end surface of the outer-duct casing. The connecting piece comprises a hexagonal head bolt a, a flat washer, and a hexagonal nut, a hexagonal head bolt b, and a hexagonal head bolt c. The ear is a welded part fixed to the upper part of the main beam by the hexagonal head bolt a, the flat washer, and the hexagonal nut. The counterweight is movably arranged on the main beam and fixed in the counterweight holes at different positions on the main beam by the hexagonal head bolt b, used to adjust the center of gravity of the lifting system. The equipment nameplate is fixed to the main beam and used to identify the lifting appliance code and the total weight. The hexagonal head bolt c and the flat washer are used to fix the rear mounting edge of the outer-duct casing in the circumferential bolt holes of the main beam.

[0005] The preferred embodiment of the horizontal C-shaped clamping and lifting device for the outer casing of the metal material is that the C-shaped structure of the main beam can avoid the rear casing unit and fit tightly with the rear mounting edge of the outer casing.

[0006] The preferred embodiment of the horizontal C-type clamping and lifting device for a metal outer casing is that the lifting lug is provided with an elliptical hole structure for cooperating with the crane hook.

[0007] The preferred embodiment of the horizontal C-type clamping and lifting device for a metal duct casing is that the number of counterweights is at least one, and the counterweights of different weight specifications can be replaced according to the weight characteristics of the duct casing.

[0008] The preferred embodiment of the horizontal C-type clamping and lifting device for the outer casing of the metal material is that the flat washer is made of a wear-resistant metal material with buffering properties, and is used to protect the connection parts of the hexagonal head bolts a and c.

[0009] An assembly method for a horizontal C-type clamping and lifting fixture for a metal outer casing includes the following steps: Step 1: Hoist the C-shaped main beam holding the lifting device to the lower side of the outer culvert casing, so that it is close to the front end face of the rear installation side, and fix it securely with connectors; Step 2: Based on the design mass and actual center of gravity of the outer casing, pre-adjust the position of the lifting lugs and counterweights, and select a suitable counterweight size; Step 3: Slightly lift the outer duct casing, check the assembly quality of the lifting equipment, and make slight adjustments to the position of the counterweight to ensure that the front and rear mounting edges of the outer duct casing remain horizontal during lifting; Step 4: Lift the outer bypass casing to the engine assembly position; Step 5: Smoothly move the outer bypass casing horizontally and install it between the intermediate casing and the rear casing unit; Step Six: Remove the lifting equipment and continue with the subsequent assembly process.

[0010] The preferred embodiment of the assembly method for a horizontal C-type clamping and lifting device for a metal duct casing is as follows: In step one, the connecting component is a hexagonal head bolt c and a flat washer. The duct casing is fixed by passing the hexagonal head bolt c through the circumferential bolt hole of the main beam and the connecting hole of the duct casing, and tightening the nut.

[0011] The preferred embodiment of the assembly method for a horizontal C-type clamping and lifting device for a metal outer casing is as follows: In step two, the position of the counterweight is pre-adjusted by loosening the hexagonal head bolt b, moving the counterweight to the target counterweight hole, and then retightening the hexagonal head bolt b.

[0012] The preferred embodiment of the assembly method for a horizontal C-type clamping and lifting device for a metal duct casing is as follows: In step three, the position of the counterweight is finely adjusted by repeatedly lifting and observing the horizontal state of the duct casing. By adjusting the fixed position of the counterweight on the main beam, the center of gravity of the lifting system is precisely controlled until the front and rear mounting edges of the duct casing are kept horizontal.

[0013] The working principle of a horizontal C-type clamping and lifting device for a metal duct casing: The C-shaped main beam effectively avoids the rear casing unit of the engine, preventing spatial interference during lifting. The C-shaped load-bearing beam is customized according to the dimensions of the rear mounting edge of the duct casing, ensuring a tight fit and reliable connection with the casing, increasing the contact area, and preventing deformation of the mounting edge due to its own weight.

[0014] The main beam of the lifting device is equipped with movable counterweights. By adjusting the position of the counterweights on the main beam, the center of gravity of the entire lifting system can be precisely adjusted. Before lifting, the counterweights are pre-adjusted according to the actual mass and center of gravity position of the outer duct casing. After lifting, fine adjustments are made to ensure that the front and rear mounting edges of the casing remain horizontal at all times. The lifting lugs adopt an elliptical hole structure, which facilitates cooperation with the hook and enhances lifting flexibility. The outer duct casing is fixed to the main beam of the lifting device with bolted connectors to ensure a firm and secure connection during lifting.

[0015] During use, the lifting equipment employs a pre-adjustment, fine-tuning, and horizontal lifting process to ensure that the outer casing remains horizontal throughout the lifting, moving, and lowering process, thus avoiding collisions with adjacent components and ensuring assembly quality and safety. Beneficial effects

[0016] The horizontal clamping and lifting fixture designed in this invention, through its specialized C-shaped structure and adjustable center of gravity, effectively avoids obstructing the rear casing unit already assembled behind the core engine. Furthermore, its center of gravity can be adjusted after the outer bypass casing is fixed, ensuring that the front and rear mounting edges of the casing remain horizontal throughout the lifting process. This achieves the goal of precisely and horizontally installing the metal outer bypass casing between the intermediate casing and the rear casing unit. It realizes highly stable and precise horizontal lifting of heavy metal outer bypass casings, significantly improving assembly quality and efficiency.

[0017] Tests have proven that this invention can ensure the safe and stable assembly of heavy metal casings, effectively avoiding damage and scrapping of adjacent parts due to control errors during engine assembly of metal casings, resulting in cost losses for replacement parts, while also saving assembly manpower. Attached Figure Description

[0018] Figure 1 A front view of a horizontal C-type clamping and lifting device for a metal outer casing; Figure 2 for Figure 1 Enlarged view of A; Figure 3 A side view of a horizontal C-shaped clamping and lifting device for a metal outer casing; Figure 4 A top view of a horizontal C-type clamping and lifting device for a metal outer casing.

[0019] In the diagram, 1-main beam, 2-lifting lug, 3-counterweight block, 4-equipment nameplate, 5-hexagonal head bolt a, 6-flat washer, 7-hexagonal nut, 8-hexagonal head bolt b, 9-hexagonal head bolt c. Detailed Implementation

[0020] The following is in conjunction with the appendix Figures 1-4 The present invention will be described in detail, but the scope of protection of the present invention is not limited by the accompanying drawings.

[0021] A horizontal C-type clamping and lifting device for a metal outer casing includes a main beam 1, lifting lugs 2, counterweights 3, equipment nameplates 4, and connecting parts; The main beam 1 is a C-shaped welded frame structure. The C-shaped dimension below it is determined according to the outer diameter of the mounting edge of the outer duct casing to be assembled. The total height of the main beam 1 is determined according to the height of the parts connected to the rear end face of the outer duct casing. The connectors include hexagonal head bolts a5, flat washers 6, hexagonal nuts 7, hexagonal head bolts b8, and hexagonal head bolts c9; The lifting lug 2 is a welded component, which is fixed to the upper part of the main beam 1 by hexagonal head bolts a5, flat washers 6 and hexagonal nuts 7; The counterweight 3 is movably mounted on the main beam 1 and fixed in counterweight holes at different positions on the main beam 1 by hexagonal head bolts b8, for adjusting the center of gravity of the hoisting system; The equipment nameplate 4 is fixed to the main beam 1 and is used to identify the lifting gear code and the total weight. The hexagonal head bolt C9 and the flat washer 6 are used to fix the rear mounting edge of the outer culvert casing to the circumferential bolt hole of the main beam 1.

[0022] The C-shaped structure of the main beam 1 can avoid the rear casing unit and fit tightly with the rear mounting edge of the outer bypass casing.

[0023] The lifting lug 2 is provided with an elliptical hole structure for cooperating with the crane hook.

[0024] The number of counterweights 3 is at least one, and different weight specifications of counterweights 3 are replaced according to the weight characteristics of the outer bypass casing.

[0025] The flat washer 6 is made of a wear-resistant and cushioning metal material and is used to protect the connection between the hexagonal head bolts a5 and c9.

[0026] An assembly method for a horizontal C-type clamping and lifting fixture for a metal outer casing includes the following steps: Step 1: Hoist the C-shaped main beam 1 of the clamping lifting device to the lower side of the outer culvert casing, so that it is close to the front end face of the rear installation side, and fix it firmly with the connector; Step 2: Based on the design mass and actual center of gravity of the outer casing, pre-adjust the positions of the lifting lug 2 and the counterweight 3, and select a suitable size for the counterweight 3; Step 3: Slightly lift the outer duct casing, check the assembly quality of the lifting equipment, and make slight adjustments to the position of counterweight 3 to ensure that the front and rear mounting edges of the outer duct casing remain horizontal during lifting; Step 4: Lift the outer bypass casing to the engine assembly position; Step 5: Smoothly move the outer bypass casing horizontally and install it between the intermediate casing and the rear casing unit; Step Six: Remove the lifting equipment and continue with the subsequent assembly process.

[0027] In step one, the connecting component is a hexagonal head bolt c9 and a flat washer 6. The outer duct casing is fixed by passing the hexagonal head bolt c9 through the circumferential bolt hole of the main beam 1 and the connecting hole of the outer duct casing, and tightening the nut.

[0028] In step two, the position of the pre-adjustment of the counterweight 3 is achieved by loosening the hexagonal head bolt b8, moving the counterweight 3 to the target counterweight hole, and then retightening the hexagonal head bolt b8.

[0029] In step three, the position of the counterweight 3 is fine-tuned by repeatedly lifting the outer duct casing and observing its horizontal state. By adjusting the fixed position of the counterweight 3 on the main beam 1, the center of gravity of the hoisting system is precisely controlled until the front and rear mounting edges of the outer duct casing are level.

Claims

1. A horizontal C-type clamping and lifting device for a metal outer casing, characterized in that, Includes main beam (1), lifting lugs (2), counterweights (3), equipment nameplate (4), and connecting parts; The main beam (1) is a C-shaped welded frame structure. The size of the C-shape below is determined according to the outer diameter of the mounting side of the outer duct casing to be assembled. The total height of the main beam (1) is determined according to the height of the parts connected to the rear end face of the outer duct casing. The connectors include hexagonal head bolt a (5), flat washer (6), hexagonal nut (7), hexagonal head bolt b (8), and hexagonal head bolt c (9); The lifting lug (2) is a welded part, which is fixed to the upper part of the main beam (1) by hexagonal head bolts a (5), flat washers (6) and hexagonal nuts (7); The counterweight (3) is movably mounted on the main beam (1) and fixed in counterweight holes at different positions on the main beam (1) by hexagonal head bolts b (8) to adjust the center of gravity of the hoisting system. The equipment nameplate (4) is fixed on the main beam (1) and is used to identify the lifting gear code and total weight; The hexagonal head bolt c (9) and flat washer (6) are used to fix the rear mounting edge of the outer culvert casing to the circumferential bolt hole of the main beam (1).

2. The horizontal C-type clamping and lifting device for a metal outer casing according to claim 1, characterized in that, The C-shaped structure of the main beam (1) can avoid the rear casing unit and fit tightly with the rear mounting edge of the outer bypass casing.

3. The horizontal C-type clamping and lifting device for a metal outer casing according to claim 1, characterized in that, The lifting lug (2) is provided with an elliptical hole structure for cooperating with the crane hook.

4. The horizontal C-type clamping and lifting device for a metal outer casing according to claim 1, characterized in that, The number of counterweights (3) is at least one, and counterweights (3) of different weight specifications are replaced according to the weight characteristics of the outer bypass casing.

5. The horizontal C-type clamping and lifting device for a metal outer casing according to claim 1 is characterized in that, The flat washer (B2) is made of a wear-resistant and cushioning metal material and is used to protect the connection between the hexagonal head bolt a (5) and the hexagonal head bolt c (9).

6. An assembly method using a horizontal C-type clamping and lifting fixture for a metal outer casing as described in any one of claims 1-5, characterized in that, Includes the following steps: Step 1: Hoist the C-shaped main beam (1) of the clamping lifting device to the lower side of the outer culvert casing, so that it is close to the front end face of the rear installation side, and use the connector to fix it firmly; Step 2: Based on the design mass and actual center of gravity of the outer casing, pre-adjust the positions of the lifting lugs (2) and the counterweight (3), and select the appropriate size of the counterweight (3); Step 3: Slightly lift the outer duct casing, check the assembly quality of the lifting equipment, and make the front and rear mounting edges of the outer duct casing remain horizontal when it is lifted by finely adjusting the position of the counterweight (3); Step 4: Lift the outer bypass casing to the engine assembly position; Step 5: Smoothly move the outer bypass casing horizontally and install it between the intermediate casing and the rear casing unit; Step Six: Remove the lifting equipment and continue with the subsequent assembly process.

7. The assembly method of a horizontal C-type clamping and lifting fixture for a metal outer casing according to claim 6, characterized in that, In step one, the connecting parts are hexagonal head bolts c (9) and flat washers (6). The outer duct casing is fixed by passing the hexagonal head bolts c (9) through the circumferential bolt holes of the main beam (1) and the connecting holes of the outer duct casing and tightening the nuts.

8. The assembly method of a horizontal C-type clamping and lifting fixture for a metal outer casing according to claim 6, characterized in that, In step two, the position of the pre-adjusted counterweight (3) is achieved by loosening the hexagonal head bolt b (8), moving the counterweight (3) to the target counterweight hole, and then tightening the hexagonal head bolt b (8).

9. The assembly method of a horizontal C-type clamping and lifting fixture for a metal outer casing according to claim 6, characterized in that, In step three, the position of the counterweight (3) is fine-tuned by repeatedly lifting and observing the horizontal state of the outer duct casing. By adjusting the fixed position of the counterweight (3) on the main beam (1), the center of gravity of the hoisting system is precisely controlled until the front and rear mounting edges of the outer duct casing are kept horizontal.

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