RU133824U1 - DEVICE FOR DETERMINING THE MASS CENTER - Google Patents

Abstract

1. A device for determining the center of mass of an object, containing four vertical racks, at least four beams and two movable traverses, while the vertical racks are located in the corners of the rectangle, the beams are horizontal, form a rectangle in the horizontal plane and are rigidly connected to the upper ends of the racks characterized in that the device is provided with at least four vertical rods and attachment points of the object, through beams and traverses are made through longitudinal grooves, traverses are placed with possible awn movable along the beams by the grooves, the vertical rods are kinematically connected with the upper part of the side members to move along the grooves, and an object attachment points are located at the bottom of each vertical rod movable along poslednih.2. The device according to claim 1, characterized in that each mount is equipped with a thrust bearing. The device according to claim 1 or 2, characterized in that each vertical rod is made with a threaded section in the lower part.

Description

The utility model relates to a technique for testing aircraft gas turbine engines (GTE) in bench conditions and can be used when installing a turbine engine on technological equipment and on a subframe in a pressure chamber.

In preparation for testing a gas turbine engine at a specialized test bench, a significant amount of installation and assembly work is necessary. One of these works is the installation of a gas turbine engine in a pressure chamber (TAC) of a test bench on an engine frame, which allows mounting a gas turbine engine on a dynamometer platform of a test bench.

When the aircraft engine is mounted on top of the aircraft, the installation is carried out on a special pylon, which is suspended in the gondola of the aircraft at three points on the adapter. To mount the aircraft engine on the pylon, and then on the adapter, the manufacturer’s assembly unit uses a special lifting device equipped with four independent suspensions that allow four independent suspensions to be hung, which allow the aircraft engine to be hung at different angles to the horizontal plane, which is necessary when installing the aircraft engine on pylon.

On test benches during installation work, a lifting device with one suspension is used, which does not allow to hang GTE at the required angles to the horizontal plane. The use of a lifting device with four suspensions would require a higher placement of crane tracks, which entails a large reconstruction of the room, which is not acceptable in every testing laboratory, and in some cases it is impossible to perform in the existing dimensions of the room. But even the use of a lifting device with four independent suspensions requires the determination of the center of mass (CM) of the GTD-frame system for hanging this system in the TBK stand at one suspension point.

A device for extracting and installing an object, in particular a heat exchanger assembly (patent RU 2264975, IPC B66F 11/00, 19/00, 9/06, B60P 3/00, publ. 2004), having a supporting frame and detachable connections, independently controlled providing tilt and alignment of the supporting frame. The device can be placed in a limited space for organizing access to the nodes of the heat exchanger, while maintaining stability during the extraction operation. The device, in addition to lifting, performs horizontal movement of overall objects, and therefore has many complex additional nodes and high cost. However, it does not allow to find the center of mass of the object.

A known design of a device for hanging and moving a gas turbine engine in the form of a supporting two-girder bridge crane with two or more freight carts (see II Abramovich, V.N. Berezin, A.G. Yaure, Hoisting cranes of industrial enterprises: Handbook. M : Engineering, 1989, p. 172). The use of a bridge crane for hanging and moving a gas turbine engine involves the use of a special modification with four independent suspensions. This imposes quite substantial requirements on the dimensions of the premises of testing laboratories and does not comply with the guidelines for choosing the type of cranes in the manuals for designing industrial enterprises and mechanizing loading and unloading operations due to the irregularity and limited intensity of such use of cranes.

The closest known from the technical nature and the achieved result is a device (patent RU 2393986, IPC B66F 7/02, B66F 11/00, published 03/27/2010) for moving bulk cargo in a vertical plane. The lifting device includes a frame, which is the upper and lower frames connected by vertical struts. The lifting device is easy to manufacture, but provides only rigid fixation of the bearing surface at a given level, without independently changing the height of the mounting points of the object. The device does not allow to determine the position of the center of mass of the object.

The utility model is based on solving the problem of simplification of hanging a gas turbine engine and finding the center of mass for further installation in the area of the center of mass of the engine suspension loop on the test bench.

To solve this problem, the device contains four vertical racks, at least four beams and two movable traverses, while the vertical racks are located in the corners of the rectangle, the beams are horizontal, form a rectangle in the horizontal plane and are rigidly connected to the upper ends of the racks.

New in the utility model is that the device is equipped with at least four vertical rods and attachment points of the object, in the beams and traverses, through longitudinal grooves are made. Traverses are placed with the possibility of moving along the beams along the grooves. Vertical rods are kinematically connected by the upper part with traverses with the possibility of moving along the grooves, and the attachment points of the object are located in the lower part of each vertical rod with the possibility of moving along the latter.

These essential features provide a solution to the problem, since:

the execution of longitudinal grooves in beams and traverses and the placement of traverses with the possibility of moving along the beams along the grooves ensures the movement of the object, in particular, the gas turbine engine in the horizontal plane and facilitates its hanging;

supplying the device with vertical rods and the kinematic connection of vertical rods with traverses with the ability to move along grooves facilitates hanging the object;

supplying the device with attachment points of the object with their placement in the lower part of each vertical rod with the possibility of movement along the latter ensures the movement of the object, in particular, the gas turbine engine in the vertical plane and facilitates its hanging;

Thus, the problem has been solved: it is possible to hang the gas turbine engine using a simple design that allows you to determine the center of mass for further installation in the vicinity of the center of mass of the engine mount loop on the test bench.

The essential features of a utility model may be developed.

Each mounting unit can be equipped with a thrust bearing, which provides a decrease in force during the vertical movement of the gas turbine engine.

Each vertical rod can be made with a threaded section in the lower part to simplify the design of the GTE fastener.

The proposed utility model is illustrated by the following detailed description of the device and its use with reference to the drawings shown in FIG. 1-3 where

In FIG. 1 shows a General view of the device.

In FIG. 2 shows a gas turbine engine on a subframe mounted in the device.

In FIG. 3 shows an arm of an engine frame on a rod with a bearing assembly.

The device contains four vertical racks 1, equipped with bases for installation on the floor of the room, two longitudinal horizontal beams 2 and two transverse horizontal beams 3, interconnected. To ensure structural rigidity, the racks 1 are connected to the beams 2, 3 by struts 4. For the convenience of installing the vertical racks 1, four mounting horizontal beams 5 are provided, which can be dismantled after the installation of the device. The horizontal beams 2 have longitudinal through grooves 6, allowing fasteners 7 of two movable traverses 8 located on the longitudinal beams 2 to move in them. In traverses 8, longitudinal through grooves 9 are made in which four vertical rods are fastened and moved 10. The rods 10 serve to suspension of a gas turbine engine assembly with an engine frame 12 (see Fig. 2) that make up the gas turbine engine frame and other technological equipment. On the rods 10 made threaded sections 11 for mounting the frame 12.

The engine frame 12 is provided with longitudinal beams 14. Four brackets 13 are mounted on the frame 12, of which two front are mounted directly on the engine frame 12, and two rear are mounted on the longitudinal beams 14 of the engine frame.

To reduce the time spent hanging the GTE frame system, tubular spacers 15 are installed on the rear rods due to the difference in the mounting heights of the brackets 15. To reduce the effort when lifting the frame 12, the bearing units 16 are installed on the rods 10 (see Fig. 3), which are fixed with nuts 17.

Vertical rods 10 having attachment points in the lower part for mounting the underframe 12 have free horizontal movement along the grooves in traverses 8 and beams 14, which allows fixing the gas turbine engine located under the rods without involving additional devices by several people. Bearing assemblies 16 in the attachment assemblies for the underframe 12 provide the ability to raise the TBG by rotating the nuts 17 on the rods with conventional wrenches.

Hanged on four rods, the gas turbine engine is in a convenient position for attaching a loop in the center of mass and hanging from a crane hook with one suspension. Finding the center of mass, i.e. loop attachment points thus reduced to a simple iterative method.

The device is used as follows.

At the first stage, the engine frame 12 is fixed in the device. At the second stage, a gas-turbine engine is attached to the frame 12. At the third stage, the center of mass of the GTE-frame system is determined and the complete TBG assembly with frame 12 is moved to the test bench.

First step. The transport trolley with the frame 12 mounted on it (see Fig. 2) is moved inside the device and the frame 12 is fixed with brackets 13 on the rods 10. After fixing the frame 12, the transport trolley is removed. The underframe 12 is lifted on the rods 10 with the help of nuts 17 to a certain height. The mounting height of the frame 12 inside the device should ensure placement under the frame of the trolley with a gas turbine engine located on it.

Second phase. GTE on the transport trolley is moved inside the device, the frame is lowered using the device nuts to a height that allows the TBG to be fixed on the engine frame 12 and the TBG is fixed on the subframe 12. For fixing the TBG on the frame 12, standard engine mounting points are used. Then, the gas turbine engine, together with the engine frame 12, is lifted up on the rods 10 to release the transport trolley. The shipping trolley is removed.

The third stage. Attach a suspension loop (not shown) to the under-motor frame 12 at a point approximately corresponding to the location of the center of mass (CM) of the GTE-frame system. The suspension loop is hooked onto the crane hook and the slack of the cable on which the hook is suspended is selected. Consistently releasing the device rods 10 from the weight load of the GTE frame system and tracking the movement of the engine, change the point of attachment of the suspension loop to the engine frame 13. By changing the point of attachment of the suspension loop, one obtains its location at which it corresponds to the CM of the GTE frame system. The obtained position of the suspension loop is fixed and the crane hook is released. This completes the determination of the center of mass.

Using rods 10, the GTD-frame system is raised to a height that allows the installation of a transport trolley under the GTD-frame system. The trolley is brought under the GTD-frame system and, releasing the rods 10, the GTD-frame system is lowered onto the trolley. The GTE frame system is fixed on the trolley, the rods 10 are completely released and they are brought out of contact with the brackets 13.

The transport trolley of the stand with the GTE-frame system fixed on it is taken out of the device.

Thus, the device for determining the center of mass is a simple and convenient tool for mounting a gas turbine engine on a test bench in the presence of a crane with only one suspension and eliminates the need for expensive cranes with four independent suspensions in the conditions of limited space and resources of the testing laboratory.

Claims (3)

1. A device for determining the center of mass of an object, containing four vertical racks, at least four beams and two movable traverses, while the vertical racks are located in the corners of the rectangle, the beams are horizontal, form a rectangle in the horizontal plane and are rigidly connected to the upper ends of the racks characterized in that the device is provided with at least four vertical rods and attachment points of the object, through beams and traverses are made through longitudinal grooves, traverses are placed with possible awn movable along the beams by the grooves, the vertical rods are kinematically connected with the upper part of the side members to move along the grooves, and an object attachment points are located at the bottom of each vertical rod displaceable along the latter. 2. The device according to claim 1, characterized in that each mount is equipped with a thrust bearing. 3. The device according to claim 1 or 2, characterized in that each vertical rod is made with a threaded section in the lower part.

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