RU2585574C2 - Latch-lock - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to latches-locks, which are used for mutual detachable connection of panels from detachable heat insulation with a protruding edge of side walls and used for heat insulation of power equipment, mostly, NPP equipment. The latch-lock has four identical hooks and a grip, including an attachment and a spring ring. The attachment is made of n angular components symmetrically arranged relative to the vertical axis of the attachment and meeting the condition $$\underset{n}{\Sigma }\theta \le {360}^{\circ },$$

at the same time n angular components are fixed to each other by m elastic wire rings, where m=1-5. Each angular component of the attachment is made in the form of an extended plate with parallel longitudinal sides, bent in half along the transverse bending line with formation of transverse sides in the form of ribs with the bending angle θ 0°<θ≤180°. On each transverse side of the extended plate symmetrically to the bending line there is a triangular ledge with upper and lower sides, crossing of which forms a top of the appropriate triangular ledge. The lower edge of each triangular ledge is arranged at the distance H from the upper longitudinal side of the extended plate, crossing of which with the upper side of the triangular ledge forms its upper edge, the distance between which and the bending line is less than the distance between the lower edge of the triangular ledge and the bending line by value W. Each extended plate is made with depth of more than H, but less than its transverse dimension, in each rib there is a longitudinal slot for placement of one of specified wire rings with the possibility to change the wire ring diameter in the range determined by slot length during latch-lock opening-closing. The edge of slots facing the axis of the attachment is located from the axis of the attachment at the distance equal to half of the inner minimum diameter of the wire ring, when it interacts with upper edges of triangular ledges, and at the distance T=H-Wctgγ from the bottom of the attachment, where γ - angle between each slot and axis of the attachment, placed in the above slots, and is capable of limited deviation from the axis of the attachment due to increased diameter of the elastic wire ring, and upper and lower edges of ribs of each composite part from the start of the bending line at both sides are processed along radius R and bent along radius r for free engagement of the hooks along radius r, and also for smooth rotation of each angular component along radius R during its diversion from the central axis of the attachment and to perceive loads in process of latch-lock operation.

EFFECT: invention provides for reduction of time spent for assembly and disassembly of blocks of unified detachable heat insulation panels.

3 cl, 14 dwg

Description

The invention relates to heat-insulating equipment, and more particularly, to quick-clamping means that are used for interconnectable detachable connection of removable thermal insulation (STI) with the edge of the side walls protruding outward and intended for thermal insulation of power equipment, mainly NPP equipment.

From the achieved level of technology it is known to use high-speed locks-latches of various designs containing a lever mechanism to create the required amount of interference between fastened removable heat-insulating panels (STP) (see, for example, US patents No. 4418724, 1980; RU No. 2241898, 2004; RU No. 2298131, 2007).

As a prototype, a latch-lock is used for fastening a STE of a trapezoidal shape with an outward protruding edge of the side walls, containing four identical hooks, placed one at a time in each of the four angles that are joined together between the side walls of the STP and are fastened together (see patent RU No. 2471092, 2012).

The disadvantage of the prototype is that when it is used, the insulated surface should be mainly flat or cylindrical with the same curvature, designed for a certain type of STP, and the number of locks-latches is equal to or greater than the number of STPs fastened together, that is, “n” locks - latch connects a maximum of "n" STP panels. Insulation of surfaces with varying curvature, for example, when the surface of the heat exchanger is docked with its bottom, when the pipelines are bent, especially spatial, during the final, so-called “bottom-hole” sections of thermal insulation, when insulating the connecting sections of pipes with heat exchanger bodies and many other, excellent from the original cylindrical surface with constant curvature, is a significant difficulty, since each curvature of the insulated surface requires its own and dividual shape with elongated (in larger curvature) and a shorter (smaller curvature at the insulated surface) of the longitudinal length of hooks that are part of the latch lock prototype. More beneficial is the insulation of surfaces with varying curvature - relatively small blocks (with dimensions ≈300 mm) of unified removable thermal insulation (USTI). Patents RU No. 2353849, 2008; RU No. 2493473, 2012. When insulating surfaces with varying curvature by USTI blocks, various elements of wedge-shaped removable thermal insulation (KSTI) may occur, mounted “in place”, for the fastening of which an additional number of locks are required. As a result, the time required for installation and dismantling of KSTI is significantly increased, although one of the main requirements for thermal insulation of power equipment, (especially at nuclear power plants) is to reduce the time spent on installation and dismantling of USI during periodic monitoring of metal of thermally insulated equipment, as well as welds on it. As for the time spent on installation and dismantling of KSTI, it depends not only on the technical and operational characteristics of the used latch lock, but also on their number. The prototype is designed to fasten only four STPs adjacent to each other adjacent to the joint plane of their side walls.

The problem to which the present invention is directed, is to create a convenient, quick-acting snap-lock, providing simultaneous fastening between the elements USI and KSTI, made with the protruding outward edge of the side walls, in the junction of the corners between their side walls. The technical result achieved in this case is to reduce the time taken during installation, dismantle the elements of the USI and KSTI, mainly by reducing the number of locks and latches needed to fasten together a given number of elements of the USI and KSTI, and increase the usability. The remaining advantages of the patented latch lock will become apparent from the following.

The problem is solved in that the latch-lock for fastening together the USTI elements with the outwardly protruding edge of the side walls contains hooks placed one at a time in each of the angles that are joined together between the side walls of the USTI fastened together by a corresponding lock-latch, and rigidly fixed on the inner surfaces of the corner sections protruding outwards of the edges of the side walls corresponding to each of the elements of the USI, as well as a grip placed on the hooks coaxially with the line of the joint of the angles between walls of the above USTI elements, each hook made in the form of an elongated plate with parallel longitudinal sides, bent in half along the transverse bend line at an angle θ = 90 °, on each transverse side of the elongated plate and made a triangular protrusion symmetrically with respect to the bend line and the lower sides, the intersection of which forms the top of the corresponding triangular protrusion, the lower edge of each triangular protrusion is located at a distance H from the upper side of the longitudinal plate, the cross section of which with the upper side of the triangular protrusion forms its upper edge, the distance between which and the bend line is less than the distance between the lower edge of the triangular protrusion and the bend line by a value W, the gripper contains a nozzle and a spring in the form of an open wire ring with end sections overlapping each other, which placed on the nozzle with the locked lock-latch securing its interaction with the lower edges of the triangular protrusions of the hooks, the nozzle is made in the form of an axisymmetric assembly, consisting of four separate identical angular components. Each individual corner component is made in the form of a sheet bent in half at an angle θ = 90 °.

The upper and lower edges of the sheets of each component from the beginning of the bend line on both sides are machined along the radius R and bent with a radius r, forming the so-called "rocking hooks", for easier entry of the protruding protruding edges of the hooks along the radius r into the latch and for support on an insulated surface during operation, as well as for a smooth rotation of each individual corner component along the radius R when it is diverted from the central axis of the nozzle. The height of the nozzle is greater than H. In each plate of the component perpendicular to the surface corresponding to it, a longitudinal slot is made, while the slots are made the same and with a width that ensures placement in the slots of the wire ring with overlapping end sections and with the possibility of change when locking / unlocking the lock-latch them of their diameter in the range determined by the length of the slots, which are located relative to the axis of the nozzle at an angle γ lying in the range 45 ° ≤γ≤90 °, while the vertex of the angle γ, with γ <90 It faces the bottom of the nozzle. The length of the slot is greater than the outer diameter of the wire ring when it interacts with the vertices of the triangular protrusions of the hooks, while the edge of the slots facing the axis of the nozzle is located at a distance equal to half the inner minimum diameter of the wire ring when it interacts with the upper edges of the triangular protrusions, and at a distance from the lower end of the component T = H-Wctgγ.

With a little effort, the coordinate position of any individual angular component relative to the axis of symmetry of the nozzle can be limitedly changed. In this case, additional wedge-shaped KSTI elements can be placed in the formed gaps with their fastening and fixing with flat hooks relative to the elastic wire ring.

Thus, the patented lock-latch has the following differences from the prototype:

- instead of four STPs fastened to each other by a corresponding lock-latch in the prototype, a double amount of USTI and KSTI elements is fastened together to a limit of eight, of which four are KSTI elements of a wedge-shaped profile, with wedge opening angles determined by the curvature of the surface, beyond which (the curvature) the corresponding angular component of the nozzle relative to the axis of symmetry of the nozzle is rejected by one or another coordinate. This property of a patented latch lock can be used when installing thermal insulation on equipment surfaces with varying surface curvatures, for example, on elliptical bottoms, on spatial bends of pipelines, at the junction of a cylindrical surface and a bottom surface, at the joints of pipes and cylindrical walls of heat exchangers and other non-standard sections of the insulated surface and, most importantly, in the bottomhole (closing) sections of the thermal insulation installation, when only in place it is possible to determine the final dimensions and opening angles of the wedge-shaped elements of the KSTI.

The advantage of the patented lock-latch, compared with the prototype, is to increase up to 2 times the number of simultaneously fastened elements STI and KSTI with one lock-latch, as well as the use of a lock-latch to isolate a surface with a varying curvature.

The invention is further illustrated by specific examples, which, however, are not the only possible, but clearly demonstrate the possibility of achieving the above technical results with a patentable combination of essential features.

Figure 1 shows four elements of a unified removable thermal insulation (USTI), docked with each other side walls and with hooks fixed to them, top view, enlarged; figure 2 is a section along aa of figure 1; figure 3 - patentable latch lock, top view; figure 4 is a section along aa figure 3; figure 5 - patentable latch lock with angular components having coordinate deviations from the axis of the nozzle; Fig.6 is a variant of an elastic hollow ring and inserted into its elastic wire ring; figure 7 - enlarged fragments V and Y of Fig.6; in Fig.8 is a variant of a hexagonal lock-latch, when the number of angular components n is equal to 6; figure 9 is a variant of a triangular lock-latch, when the number of angular components n is 3; figure 10 is a variant of the docking blocks USI and KSTI; figure 11 is a fragment Z of figure 10 with hooks block KSTI; in Fig.12 - the angular component of the nozzle when α = 90 °; in Fig.13 is a variant of the assembly of the nozzle from the corner components, including one connecting elastic ring with an internal spring wire; on Fig - option Assembly nozzles from the corner components with different bending angles α.

The latch lock for fastening together the USTI blocks pos.1 with the edges protruding outward pos.2 of the side walls contains four identical hooks pos.3, placed one at a time in each of the four angles that are joined together between the side walls of the USTI pos.1 between each other with a corresponding lock-latch, as well as rigidly fixed on the inner surface of the corner sections of the protruding outward edges of pos.2 of the side walls corresponding to each of them to the USTI unit pos.1, and in the locked state they are in engagement with a wire ring pos.15 placed coaxially to the line pos.4 of the joint of the corners between the side walls of the USTI blocks pos.1, simultaneously fastened together by a corresponding latch lock (Fig.1-4).

Each hook pos.3 (figures 1, 2, 10 and 11) from the group of four hooks corresponding to each lock-latch is made in the form of an elongated plate pos.12 with parallel longitudinal sides pos.8 and 9, bent in half along the transverse fold line at an angle θ = 90 °.

On each transverse side of the plate, item 12, a triangular protrusion is made with the upper pos. 5 and lower pos. 11 sides, the intersection of which forms the top of pos. 6 of the corresponding triangular protrusion. The lower edge of the poses. 10 of each triangular protrusion is formed by the intersection of its lower side pos.11 with the lower portion of the transverse side of the plate corresponding to it pos.12 and is located at a distance - H from its upper longitudinal side pos.9, the intersection of which with the upper side pos.5 of the corresponding triangular protrusion forms its upper edge, pos. 7. The triangular protrusions are made identical and are located symmetrically with respect to the bend line of the elongated plate, while the distance between the bend line and the upper edge of pos. 7 of each triangular protrusion is less than the distance between the bend line and the lower edge of pos. 10 of each triangular protrusion by the value of W, which depends (as will described in detail below) from the required compression force of the hooks pos.3 in the locked state of the latch. As for the above-mentioned lower sections of the transverse sides of the plate, item 12, they can be of any shape, namely, a straight, curved, convex, concave or parallel fold line. It should be noted here that the edges of pos. 7 and pos. 10 of the triangular protrusion, as well as its vertex pos. 6, can be rounded. The obtuse angle α between the upper side of pos. 9 of the plate of pos. 12 and the upper side of pos. 5 of a triangular protrusion lies, preferably, in the range from 110 ° to 135 °, since at angles α less than 110 °, the height of the hooks of 3 , and at angles α greater than 135 °, inconvenience can occur due to the considerable efforts that must be applied by the user when locking the latch. Since the upper edge of pos. 7 of each triangular protrusion is located at a smaller distance from the fold line than their lower edges of pos. 10, therefore, the length L _{1 of the} upper side of pos. 5 of each triangular protrusion is greater than the length L _{2 of} its lower side of pos. 11, while L ₁ and L ₂ satisfy the following relationships:

L ₁ cosα-W = L ₂ cos (α + β);

H = L ₁ sinα + [L ₂ cos (α + β)] tg (α + β),

where β is the angle at the vertex pos.6 of each triangular protrusion.

The latch lock (Figs. 3, 5, 8 and 9) contains an axisymmetric nozzle consisting of four angular components and a spring in the form of an open wire ring pos. 15 with end sections overlapping each other, which is placed on the nozzle in the longitudinal slot pos. 16, with the possibility of locking / unlocking the lock-latch of the reverse change of its diameter while maintaining the overlap of its end sections, while the inner minimum diameter D _{min of the} wire ring pos.15 lies in the range from 2B ₁ to 2B _1-d , where:

B ₁ - the distance between the upper edge of each triangular protrusion of the hook pos.3, fixed (for example, by spot welding) on the inner surface of the corner sections of the protruding outward edges pos.2 of two adjacent side walls of USTI blocks pos.1, and the outer edge of the angle between these side walls; d is the size of the wire in the radial direction of the wire ring pos.15, in particular, the diameter of the wire of circular cross section. As for the inner maximum diameter D _{max of the} wire ring pos. 15, it is equal to twice the distance B ₂ between the top of each triangular protrusion of the hook pos.3, mounted on the inner surface of the corner sections of the outward-facing edges pos.2 of two adjacent side walls of the blocks .1, and the outer edge of the angle between these side walls.

, где: n=2-6 - количество угловых составных частей, входящих в насадку (фиг.14).The nozzle can be made in the form of axisymmetric or n angular components pos.25, including symmetrically bent ribs bending the edges at an angle θ = 360 ° / n, or nonsymmetric n corner components, with a ribs bending angle 0 ° <θ≤180 ° located circumferentially relative to the vertical axis of the nozzle and satisfying the condition $$\underset{n}{\Sigma }\theta \le 360°$$

where: n = 2-6 is the number of angular components included in the nozzle (Fig.14).

The upper and lower edges of the ribs of each component from the bend line are machined along the radius R by a value of c, and by a value of b are bent along a radius r, forming "rocking hooks", for unhindered entry of hooks of fastened heat-insulating blocks into the latch along a radius r and to absorb the load during operation, as well as for a smooth rotation of each corner component along the radius R when it deviates from the axis of the nozzle. In this case, the center of radius R is located on the axis of pos. 24 of the nozzle of pos. 25, and the radius depends on the curvature of the insulated surface: the greater the curvature of the insulated surface, the smaller the radius R.

проволочного кольца поз.15 (иными словами, равен расстоянию B₂), и на расстоянии T=H-Wctgγ от низа насадки.In each rib pos. 14, perpendicular to its plane, a longitudinal slot is made pos. 16 for the wire ring pos. 15, while the slots pos. 16 are made the same and with a width that provides the possibility of locking-unlocking the lock-latch of the return change with the wire ring pos. 15 its diameter in the range determined by the length of the slots pos.16, which are located relative to the axis of pos.24 at an angle γ (45 ° ≤γ≤90 °) whose top at γ <90 ° faces the lower part of the nozzle. The inner edge of the slots pos.16 is located at a distance from the axis of pos.24, equal to half the inner minimum diameter $$D_{\min }^{\mathrm{one}}$$

wire ring pos.15 (in other words, equal to the distance B ₂ ), and at a distance T = H-Wctgγ from the bottom of the nozzle.

The number of slots along the height of the nozzle can be made m, where: m = 1-5, unequal in length and width and located at different or equal intervals in height of the angular components. The number of slots and wire rings fixed in the slots, in each case, is determined from the conditions of the weight characteristics of the USTI blocks involved in the assembly, the curvature of the insulated surface and the mechanical properties of the wire rings. The lengths of the hooks pos. 3 in the USTI blocks in these cases can also be unequal.

The nozzle is made of metal or plastic in the form of n angular components of pos.25, interconnected by elastic wire rings pos.15.

In a preferred embodiment of the invention, the ends of the wire ring pos. 15 are bent outward to enable the diameter of the wire ring pos. 15 to be manually increased when unlocking the latch lock. This improves the usability of the latch lock when it is unlocked.

The wire ring can be made hollow in the form of a thin-walled elastic pipe with an inner diameter D _B , inside which an additional wire ring with a diameter (d _K , d _K <D _B ; is placed; round end caps with a diameter of B _{3 are} coaxially fixed at the ends of the wire ring, and at the ends a hollow pipe fixedly secured coaxially rounded plugs with a central aperture with a diameter d _1, under condition d _K <d ₁ <D _G <D _B in accordance with Figures 6 and 7. Such flexible assembly design provides maximum elongation of flexible elastic elements pos. 18 and pos. 19 when using a latch for installation on insulated surfaces of large curvature.

The invention is used as follows. Patented latch-lock is made in the form of two functional parts, which in the locked state of the latch-lock interact with each other with a given interference. Only one part of the latch is firmly fixed, namely the hooks pos.3. The hooks of pos. 3 (from the group of n hooks of pos. 3 corresponding to each lock-latch) are installed one on each of the four USTI blocks fastened together with the corresponding lock-latch, while the hooks of pos.3 are placed one in each of the mating between the four corners between the side walls of the above USTI blocks pos.1, close to the inner surfaces of the corner sections protruding outward edges pos.2 of the side walls corresponding to each of the USTI blocks pos.1 with the same height serving on d the edges of pos.2 of the part of all the hooks of pos.3, which is no less than 1.5d greater than H. After that, the hooks of pos.3 are rigidly connected to the protruding outward edges of pos.2 of the side walls of the respective USTI blocks pos.1 in places of mutual contact, preferably by spot welding. In a preferred embodiment of the invention, the height of the protruding above the edges pos.2 of the side walls of the USTI blocks pos.1 of the part of the hooks pos.3 is 15-20 mm.

The second part of the latch-lock, namely, the nozzle, is made in accordance with the geometric parameters of the hooks of pos. 3 of the USTI blocks used in each particular case, is installed on the corresponding four hooks of pos. 3, which are fixed, as described above, on four USTI blocks fastened to each other by means of a corresponding latch-lock, after the USTI blocks mentioned above are joined together by side walls. To do this, first, manually, the nozzle is oriented relative to the four hooks of pos. 3, fixed (as described above) on the USI blocks pos. 1 joined to each other by the side walls, fastened together by a corresponding snap-lock, and forming together as a result of joining the four USTI blocks pos .1 a figure with a 4-beam crosshair so that the 4-beam crosshair of the rocking lures, obtained in the nozzle of four corner components, is opposite the hooks mentioned above, pos. 3. After this, the hooks of pos. 3 are inserted into the rocking chambers and then into the formed groove of the beam crosshairs until the upper edges of pos. 7 of the triangular protrusions of the hooks of pos. 3 stop in the wire ring of pos. 15, which, under the action of the radially directed compression force, has a minimum diameter, in other words, pressed to the edges of the slots pos.16 facing the axis of pos.24. It should be noted here that, due to the rounded edge of the rocking jams along the radius r, the unhindered entry of the hooks pos. 3 into the formed groove of the beam crosshair is ensured. In addition, each hook pos.3 is placed in the corresponding radial grooves corresponding to each of them, as a result, the nozzle is automatically installed coaxially with the line pos.4 of the corner junction between the side walls of the USTI blocks pos.1, fastened together by a corresponding snap-lock.

Then, coaxially with the nozzle and in the direction of the USTI blocks pos.1, a force is applied, which is transmitted through the wire ring pos.15 to the upper sides of pos.5 of the triangular projections of the hooks pos.3. Under the action of a radially directed tensile force, which occurs when the wire ring pos. 15 interacts with the inclined upper sides of pos. 5 triangular projections of the hooks pos. 3 and which is inversely proportional to the angle (α - 90 °), the diameter of the wire ring pos. 15 when moving the nozzle towards the USTI blocks pos.1. The diameter of the wire ring pos.15 reaches its maximum value when it interacts with the vertices of pos.6 of the triangular projections of the hooks pos.3.

With further movement of the nozzle in the direction of the USTI blocks pos.1, the latch-latch latches, as a result of which the wire ring pos.15 is installed in the position corresponding to the locked state of the latch-lock, in which the wire ring pos.15 interacts (pressed) to the lower edges pos. 10 triangular projections of the hooks pos. 3. In other words, there is a sharp change in the diameter of the forcibly stretched wire ring pos.15 under the action of the elastic compression force from its maximum value to a value determined by the position of the lower edges of pos.10 of the triangular protrusions relative to their upper edges of pos.7. Moreover, the greater the distance W, the larger the diameter of the wire ring pos. 15 in the locked state of the latch-lock, and therefore, the greater the force that compresses the USTI blocks corresponding to this latch-lock with the patented latch, pos.1. It should be noted that in the locked state of the latch, the upper side of pos. 9 of each plate, pos. 12 does not protrude below the lower edge of the rocking rods of radius R. As for the direction of the force generated by the wire ring of pos. 15 in the locked state of the latch, then it is determined by the angle γ at which the slots of pos. 16 are made in the ribs of pos. 14. So at γ = 90 ° the wire ring pos.15 creates a force directed in the radial direction to the axis of pos.24. At γ <90 °, the wire ring pos. 15 in the locked state of the latch-lock creates a compression force directed at an angle y to the axis of pos. 24. Therefore, in this case, not only a force is created that ensures the USTI blocks pos.1 are pulled together, but also a force that ensures the nozzle is pressed against the upper side of pos.5 of all the plates of pos.12, in other words, to the hooks of pos.3. In this case, more reliable fastening of the USTI blocks pos.1 is provided.

Thus, the patented lock-latch provides the possibility of choosing (when designing) the most optimal in each case ratio between the magnitude of the compressive force in the radial direction and the magnitude of the pressing force of the nozzle to the hooks pos.3. The implementation of the slots pos.16 at an angle γ <45 ° is impractical, since in this case the compression force is less than the clamping force of the nozzle to the hooks pos.3. To open the latch, it is necessary to sharply (impulse) apply the bending force P directed from the USTI blocks pos. 1 and to the axis pos. 24 to one of the nozzle sections. To facilitate unlocking the latch-lock, it is necessary, before applying the bending force P, to bring the ends of the wire ring, bent outward pos. 15, as close together as possible, with your fingers or with the help of pliers. Therefore, the patented latch lock provides high performance, both when it is locked and when it is unlocked. It also allows you to reduce the time spent during installation and dismantling of the USTI blocks pos.1 and KSTI pos.23, including by reducing the number of locks and latches needed to fasten together a given number of USTI blocks pos.1 and KSTI pos.23 .

The industrial applicability of the patented invention is also confirmed by the possibility of its implementation using well-known technological equipment of engineering enterprises and materials.

The list and name of the items used in the invention

1. Unified removable thermal insulation (USTI)

2. Side edge protruding outward

3. Hooks

4. The junction line of the corners

5. The upper side of the triangular protrusion

6. The top

7. The edge of the triangular protrusion

8. The lower side of the plate pos.12

9. The upper side of the plate pos.12

10. The edge of the triangular protrusion

11. The lower side of the triangular protrusion

12. The extended plate

13. Slides - rounded bent part of the rib at an angle γ

14. Rib

15. Unclosed wire ring with overlapping ends

16. The longitudinal slot

17. The basic rounded part of the slides

18. Elastic hollow ring with a minimum gap in one place

19. Elastic hollow ring with a minimum gap in one place

20. Face washer with a diameter

21. End cap with hole diameter d ₁

22. Blocks universal removable thermal insulation (USTI)

23. Blocks wedge-shaped removable thermal insulation (KSTI)

24. Axis

25. Angular component of the nozzle

Claims (3)

1. The latch-lock for simultaneous fastening between the joints of the corners between the protruding outward edges of the side walls of the unified removable heat-insulating panels, containing four identical hooks and a grip, including a nozzle and a spring ring, each hook made with the possibility of placement in each of which are joined together four angles between the side walls, and the nozzle is made with the possibility of placing on hooks coaxially the line of the joint of the angles between the side walls of the panels, characterized in that the nozzle is made of n angular components symmetrically located relative to the vertical axis of the nozzle and satisfying the condition $$\underset{n}{\Sigma }\theta \le {360}^{\circ }$$

moreover, n angular components are fastened together by m elastic wire rings, where m = 1-5, while each angular component of the nozzle is made in the form of an elongated plate with parallel longitudinal sides, bent in half along the transverse bending line with the formation of transverse sides in in the form of ribs with a bend angle θ 0 ° <θ≤180 °, on each transverse side of the elongated plate, a triangular protrusion is made symmetrically with respect to the bend line with the upper and lower sides, the intersection of which forms the apex of the corresponding of the angular protrusion, the lower edge of each triangular protrusion is located at a distance H from the upper longitudinal side of the elongated plate, the intersection of which with the upper side of the triangular protrusion forms its upper edge, the distance between which and the fold line is less than the distance between the lower edge of the triangular protrusion and the fold line by W wherein each elongated plate is made with a depth that is greater than H and less than its transverse size, a longitudinal slot is made in each rib to accommodate one of curved wire rings with the possibility of locking / unlocking the latch to change the diameter of the wire ring in the range determined by the length of the slot, while facing the axis of the nozzle the edge of the slots is located from the axis of the nozzle at a distance equal to half the inner minimum diameter of the wire ring when it interacts with the upper edges of the triangular protrusions and at a distance T = H-Wctgγ from the bottom of the nozzle, where γ is the angle between each slot and the axis of the nozzle placed in the said slots, and has the possibility of limiting deviation from the axis of the nozzle due to an increase in the diameter of the elastic wire ring, and the upper and lower edges of the ribs of each component from the beginning of the bend line on both sides are machined along the radius R and bent along the radius r for unhindered entry of the hooks along the radius r into the grip, and for smooth rotation of each corner component along the radius R when it is diverted from the central axis of the nozzle and for the perception of loads during operation of the latch. 2. The latch according to claim 1, characterized in that the nozzle is made with a bend angle of the ribs θ = 90 °. 3. The latch according to claim 1, characterized in that the elastic wire ring is hollow in the form of an open thin-walled elastic pipe with an inner diameter D _in , inside which an additional open elastic wire ring with a diameter of d _k is placed, with d _k <D _in , at the ends of the wire ring, round plugs with a diameter of D _s are coaxially fixed, and rounded plugs with a central hole with a diameter of d ₁ are coaxially rigidly fixed to the ends of the hollow pipe, subject to the condition d _to <d ₁ <D _s <D _c .

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