RU2330753C2 - Instrument for dismantling of demountable pipelines with joint of "socket" type - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: instrument for dismantling of demountable pipelines with joint of "socket" type consists of two semicircles that are mutually installed in respect to each other with formation of circle and movably joined at one end with the help of connecting rod, with slots, in which cams are installed that are movably joined to semicircles with the help of axes and between each other by means of axes and handles. In every semicircle along the full length of arc in the area of contact part figure cuts are arranged that form wedge-shaped working protrusions. Internal surface of every protrusion is rounded to its top, and external surface forms incline angle that is equal to 37 degrees with symmetry axis of instrument.

EFFECT: instrument technological resources are expanded; its material intensity is reduced, and reliability in operation is increased.

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Description

The invention relates to a mounting tool for collapsible pipelines with a socket type “Bell” and can be used when dismantling these connections to breed a locking steel split spring ring included in the connection set.

Known sleeve demountable (figure 1) [1], containing two half rings 1, mutually arranged relative to each other with the formation of a circle and movably connected from one end using a connecting rod 2 having grooves 3, in which there are cams 4, movably connected to the half rings by means of axes 5 and between themselves by means of axles 6 and handles 7. Each half-ring (Fig. 2) has a contact surface 1, which is a lateral surface of a truncated cone, forming an inclination angle α equal to 45 degrees with the axis of symmetry of the tool.

The disadvantage of the existing split sleeve is the need for significant external force for breeding a steel split spring ring of circular cross-section at the initial moment of exposure to it from the side of the sleeve. Significant force is required in cases where the ring is located in conjunction with an offset relative to its normal position, or when dismantling a joint that has impurities in the form of ice, sand, earth.

The present invention solves the problem of expanding the technological capabilities of the tool, reducing material consumption and increasing its reliability during operation.

The solution to this problem is achieved by changing the shape and optimizing the geometric parameters of the half rings of the known split sleeve.

Figure 3 presents the design of the proposed tool for dismantling collapsible pipelines with a connection of the type "Bell", containing two half rings 1, mutually spaced relative to each other with the formation of a circle and movably connected from one end using a connecting rod 2 having grooves 3, of which cams 4 are mounted movably connected to half rings by means of axes 5 and between themselves by means of axles 6 and handles 7. Each of half rings 1 along the entire length of the arc contains curly cutouts 8 forming wedge-shaped slaves Chie protrusions 9. When the inner surface 10 of each projection is rounded to its top, and the outer surface 11 forms with the symmetry axis of the tool inclination angle α equal to 37 degrees.

The shape and geometric parameters of the working protrusions are optimized using the finite element method implemented in the LS-DYNA multipurpose software package [2].

After the occurrence of force contact between the working protrusions of the tool and the split spring ring, the latter, being an unsecured part of the system, is sandwiched between the fixed plane formed by the joint part on the one hand and the conical surface of the working protrusions of the tool on the other. In this case, the ring, remaining stationary relative to the translationally moving conical surface of the working protrusions acting on it, is elastically deformed in the radial direction. As a result of deformation, the diameter of the ring increases to a predetermined value corresponding to the transition of the conical surface of the working protrusions into a cylindrical one.

The use of half rings with wedge-shaped working protrusions, as well as the execution of the outer surface of the protrusions, taking into account the calculated value of the angle of inclination, will reduce the overall level of required effort to dilute the joint ring. Figured cuts in half rings will make it possible to part the ring of a heavily contaminated compound during the operation of the proposed tool. Rounds at the top of the contact edge of the working protrusions provide a power reserve of the tool when it is inserted into the joint.

The technical efficiency of the proposed tool for dismantling collapsible pipelines with the "Bell" connection is to increase reliability and reduce energy consumption by contact dilution of steel split spring rings of the "Bell" connection with half rings of the split sleeve.

LITERATURE

1. Operation manual for field cross-country trunk pipelines. M .: Military Publishing, 1982, 368 p. - prototype.

2. Eremenko S.Yu. Finite element methods in the mechanics of deformable bodies. Kharkov, "Foundation", 1991, 272 p.

Claims (1)

A tool for dismantling collapsible pipelines with a “Bell” type connection, containing two half rings mutually spaced relative to each other to form a circle and movably connected from one end using a connecting rod, having grooves in which cams are mounted, movably connected to the half rings by axes and between themselves by means of axles and handles, characterized in that, in order to expand technological capabilities and reduce the metal consumption of the tool for dismantling the "Bell" connection, in each floor rings over the entire length of the arc in the contact portions are shaped cutouts which form wedge-shaped lobes, the inner surface of each projection is rounded to its top, and the outer surface forms with the axis of symmetry of the tool inclination angle of 37 °.

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