RU2793771C1 - Method for assembling xenon high pressure tank with cable fastening system - Google Patents

Abstract

FIELD: spacecraft engineering.

SUBSTANCE: methods for assembling spacecraft (SC) elements, mainly a xenon high-pressure tank (XHPT) with a cable fastening system. When assembling the specified XHPT containing a metal liner, first, the plates of the cable fastening system are installed on the plates of the attachment points and the XHPT is suspended in the load-bearing structure of the body (LSB) of the SC. The adjusting mechanisms of the nodes are assembled separately and after that the XHPT centering in the LSB is carried out along them. An individual set of washers is laid in each attachment point, the thickness of which provides a given tension of the cables. The tension is created by washers and nuts installed on the adjusting mechanisms from a set of assemblies, which are tightened according to a certain pattern manually and with a torque wrench.

EFFECT: increasing the reliability of the XHPT installation with a cable fastening system on the SC LSB due to the guaranteed provision of the required tension of the cables with a given tolerance, without measuring the tension forces.

1 cl, 4 dwg

Description

The present invention relates to a technology for assembling elements of spacecraft, mainly a xenon high-pressure tank with a cable-stayed system.

The high-pressure xenon tank (HPV) as part of the spacecraft (SC) provides the required volume of the working fluid - xenon gas (up to 500 l) for the implementation of independent completion of the spacecraft from the intermediate orbit to the operating orbit using its own electric propulsion system.

Technically similar analogs are CVD with a cable-stayed fastening system, presented in the description of the following patents of the Russian Federation:

- No. 2554699 "Metal-plastic high-pressure cylinder" containing a metal liner having a lower and upper bottom, an outer reinforcing reinforcing shell made of a tape composite material impregnated with a binder. The liner is made in the form of an ellipsoid formed by connecting two bottoms to each other, while the walls of the liner are made of the same thickness; the outer reinforcing reinforcing shell is made along the entire outer surface of the liner with fastening elements of the structure of the metal-plastic cylinder, which are made with the same tape in the process of winding the reinforcing shell of the liner, while the tapes, forming loops, evenly placed outside along the perimeter of the connection of the bottoms, are fastened in pairs using plates at one point with uniform tension when fastening the cylinder, while all the plates are at an equidistant distance from the cylinder and are made with a hole for the possibility of fastening the cylinder structure with a threaded connection;

- No. 2631202 "Metal-plastic high-pressure cylinder" containing a metal liner made of the upper and lower convex bottoms of the same thickness, hermetically connected along the perimeter of their edges; an outer reinforcing reinforcing shell made along the entire outer surface of the liner with elements for fastening the cylinder to the spacecraft, made with the same tape in the process of winding the reinforcing shell, while the tapes form loops evenly spaced outside along the perimeter of the connection of the edges of the bottoms, adjacent loops are fastened in pairs using plates at one point, while all plates are at an equidistant distance from the cylinder and each of them is made with a hole for a threaded connection using a bolt, nut and washers. Each washer is made with an annular convex spherical surface at the place of its contact with the plate hole and at the place where the cylinder is attached to the spacecraft, which is made in the form of a sleeve with an inner surface in the form of a truncated cone, the smaller diameter of which is greater than the diameter of the bolt and has a counter mating surface under the spherical surface washer, and the base of the cone is directed towards the connection with the plate, the hole of which is made with a counter mating surface under the spherical surface of the second washer.

Mentioned in the above patents "the fastening elements of the structure of the metal-plastic cylinder, which are made with the same tape in the process of winding the reinforcing shell of the liner, in the form of loops, evenly spaced outside along the perimeter, fastened in pairs using plates at one point with uniform tension when attaching the cylinder, the plates are at an equidistant distance from the cylinder and are made with a hole for the possibility of fastening the cylinder structure with a threaded connection "hereinafter in the text we will call the cable-stayed system, and the tape - the guy.

A cable system is a prestressed system consisting of cables intertwined relative to each other and rigidly connected to each other.

Guy is a flexible load-bearing element working in tension.

Also known are the attachment points for mounting the HPC with a cable-stayed attachment system, presented in the description of the following patents of the Russian Federation:

- No. 2625211 "Adjustable fastening assembly for structures with an interface on slings", contains the inner first part of the assembly - a composite platform with slings, fixed with a bolt between the plate and the bracket connected to the outer second part of the assembly by means of two sets of fasteners, which consist of nuts , spherical washers, as well as connecting elements, characterized in that the outer second part of the assembly consists of transition elements - struts with counterparts, with a support plate installed on them and fixed with bolts, washer-type gaskets are installed between the spacers and the support plate; sets of fasteners additionally contain outer bushings, inner bushings, and studs are used as connecting elements;

- No. 2691552 "Sling tension adjustment unit", consists of two parts - internal and external, interconnected by means of a set of fasteners, which includes a stud, washer and nut, while the internal part of the unit consists of a platform with slings, fixed between the inner lining and the outer lining by means of a bracket with an eye, washers and nuts, and the outer part of the assembly is installed on the load-bearing structure of the body and consists of a supporting lining and mating linings, interconnected by screws;

- No. 2605666 "Adjusting and connecting device", containing a set of fasteners for a swivel, presented in the form of spherical washers, nuts, characterized in that it contains a frame, on the mounting surfaces of which adjustment units are installed, consisting of a pair of linings with spherical counter surfaces , one of the plates has four guys extending from it and three additional sets of fasteners forming a hinged connection;

- No. 2689892 "Universal interface for mounting equipment with a cable-stayed fastening system", containing a frame, on the seating surfaces of which adjustment nodes are installed, the frame has a universal set of holes for fixing it to the load-bearing structure of the body of various configurations, and seating surfaces on both sides, on which, by means of fasteners, tension adjustment nodes are installed on the outside and fixation nodes on the inside, and between the tension adjustment and fixation nodes, an overlay with guys is fixed; the tension adjustment unit is technological (removable), it consists of a support beam with fasteners, a spherical washer, a stud, a nut, an overlay with fasteners, and a fixation unit is stationary, it consists of an overlay with fasteners, a bushing, a spherical washer and a bolt;

- No. 2712709 "Cable Tension Assembly", contains a platform with cables fixed between the plate and the first bracket, as well as the second and third brackets for installation on the inside and outside of the hull load-bearing structure, the shape of which is selected from the condition of preventing their movement relative to the hull load-bearing structure , the first bracket is connected to the third bracket by means of a tension adjustment mechanism consisting of two axles, a hinge, a rod, a stud, a washer and a nut.

A common disadvantage of the above technical solutions is the need to measure the actual values of the tension forces in the guys directly in the process of tension. However, in view of the peculiarities of the mesh load-bearing structures of the hull (SCM) of the spacecraft, there is a high probability that the device for measuring tension forces will not have access to the cables. In this case, it is impossible to provide the required force in the guys.

Based on the closest set of essential features, as a prototype, the method of installing a metal-plastic cylinder, presented in the description of the patent of the Russian Federation 2554699 "Metal-plastic high-pressure cylinder", is chosen, according to which uniform tension of the tapes of the fastening elements of the structure along the entire perimeter of the connection of the bottoms of the liner is ensured. The disadvantage of the closest analogue is the lack of a description of the sequence of actions and devices necessary to ensure uniform tension of the tapes (cables).

The task to be solved by the claimed technical solution is to create a method for mounting the CVD with a cable-stayed fastening system on the SC SC, which makes it possible to ensure the reliability of the installation, due to the guaranteed provision of the required tension force in each cable with a given tolerance, without measuring tension forces.

The problem is solved by the fact that the method of mounting a CVD with a cable-stayed fastening system containing a metal liner, an external reinforcing reinforcing shell made along the entire outer surface of the liner with fastening elements that are made with the same tape in the process of winding the reinforcing shell of the liner and fastened in pairs using plates with a hole for fixing the tank with a threaded connection. Initially, overlays of attachment points are installed on the plates of the cable-stayed system, and the adjusting mechanisms of the attachment points are assembled separately, after which the CVD is suspended and installed in the SCC of the spacecraft, in size K1, in four mutually perpendicular attachment points, pre-assembled adjusting mechanisms of the attachment points are installed, along which alignment is carried out CBVD in the SKK KA by creating in opposite nodes the same distance K2 from the edge of the adjusting mechanism of the mount to the landing plane on the pad of the SKK KA, after which an individual set of washers is laid in each mount, the thickness of each set of washers is determined by the actually measured values of K2 in the node and depends on the size of the gap K3, necessary to move the adjusting mechanism that provides the specified tension of the cables, to create tension in these nodes, washers and nuts are installed on the adjusting mechanisms from the fastening assembly, the nuts are first tightened by hand until they stop, and then alternately on each node of the nut are tightened in a quarter of a turn with a torque wrench until the required tightening torque is reached, the above operations are repeated for the remaining groups of mutually perpendicular nodes.

The claimed method of mounting a xenon high-pressure tank with a cable-stayed fastening system provides the required tension force in each cable, with a given tolerance, due to a guaranteed gap of K3 to which each adjusting mechanism can move. The value of the gap K3 required to move the adjusting mechanism, which provides the specified tension of the cables, is determined by calculation or experiment in the technological (transport) ring, which provides access for measuring the tension forces of the cables. When tightening the nuts, the specified gap is selected, providing additional mounting reliability, due to the additional resistance of the assembly to dynamic loads.

The essence of the invention is illustrated by the figures of the drawings, which show:

- fig. 1 - general view of the CBVD in the SCC of the spacecraft;

- fig. 2 - top view of the CBVD in the spacecraft SCM;

- fig. 3 - the attachment point in the section (when using the node presented in the patent of the Russian Federation No. 2625211);

- fig. 4 - fastening unit in section (when using the unit presented in the patent of the Russian Federation No. 2712709).

The claimed installation method is applicable:

- for CVD with any number of plates on a cable-stayed system. In this case, in the description, the CVD was used, the cable-stayed system of which has 24 plates;

- when mounted on any SSC of the Express-1000 series spacecraft;

- when using any of the attachment points developed earlier and mentioned above. In this case, the description used the attachment points presented in the patent of the Russian Federation No. 2625211 (Fig. 3) and in the patent of the Russian Federation No. 2712709 (Fig. 4).

Before mounting the HPC with a cable-stayed system in the SC SSC, the following preparatory operations must be performed (not shown in the figure):

- installation on the plates of the cable-stayed system of overlays of the selected attachment point;

- assembly of adjusting mechanisms of the selected attachment point.

The installation of the CVD with a cable-stayed fastening system in the SSC is carried out in the following sequence:

- CBVD 1 with a cable-stayed system 2 is installed in a suspended state in the SKK KA 3 in size K1;

- CBVD 1 is centered relative to the rotation axis 4 of the SCM KA 3, for which four mutually perpendicular nodes 5 (for example, H1, H13, H7, H19) are installed pre-assembled adjusting mechanisms 6, in opposite nodes the same distance K2 from the edge of the adjusting mechanism 6 is provided up to the landing plane of the pad 7 on the SKK KA 3;

- an individual set of washers 8 is placed in each attachment point, the thickness of which is determined by actually measured values of K2 and depends on the size of the gap K3 required to move the adjusting mechanism 6, which provides a given tension force of the cables;

- to create tension in these nodes, washers 9 and nuts 10 are installed on the adjusting mechanisms from the composition of the attachment points, which are tightened by hand until they stop. Then, alternately at each node, the nuts 10 are tightened in a quarter of a turn until the required tightening torque is reached;

- all the above operations are repeated for the remaining groups of mutually perpendicular nodes 5 (for example, H4, H16, H10, H22; H3, H15, H9, H21; H5, H17, H11, H23; H2, H14, H6, H18; H12, H24, H8, H20).

The technical result of the present invention is to increase the reliability of the installation of a CVD with a cable-stayed fastening system on the SSC SSC, due to the guaranteed provision of the required tension force in each cable with a given tolerance, without measuring tension forces.

Claims (1)

Mounting method of a xenon high-pressure tank (HPP) with a cable-stayed fastening system, containing a metal liner, an external reinforcing reinforcing shell made along the entire outer surface of the liner with fastening elements that are made with the same tape during winding of the liner reinforcing shell and fastened in pairs when with the help of plates with a hole for attaching the tank with a threaded connection, characterized in that, initially, the plates of the attachment points are installed on the plates of the cable-stayed system, and the adjusting mechanisms of the attachment points are assembled separately, after which the CBVD is suspended and installed in the load-bearing structure of the body (SCM) of the spacecraft (SC) in size K1 along the axis of rotation of the SKK, in four mutually perpendicular attachment points, pre-assembled adjusting mechanisms of the attachment points are installed, along which the centering of the CVD in the SKK of the spacecraft is carried out by creating in opposite nodes the same distance K2 from the edge of the adjusting mechanism of the mount to the landing plane on the SKK overlay KA, after which an individual set of washers is placed in each attachment node, and the thickness of each set of washers is determined by actually measured values of K2 in the node, depending on the size of the gap K3 necessary to move the adjusting mechanism that provides the specified tension of the guys, and to create tension in the specified washers and nuts are installed on the adjusting mechanisms from the fastening assembly, and the nuts are first tightened by hand until they stop, and then alternately on each node the nuts are tightened a quarter turn with a torque wrench until the required tightening torque is reached, while the above operations are repeated for the remaining groups mutually perpendicular nodes.

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