RU163353U1 - CABLE CLOSING PLATE - Google Patents

Abstract

A plate for closing the cable, having a rectangular shape in plan, stiffeners located on the bottom side and around the perimeter of the plate, and made of thermoplastic polymer, which is used as a mixture of low density polyethylene and high density polyethylene, taken in a 1: 1 ratio, mineral filler, which is used as building sand, and iron oxide pigment, characterized in that the height of the ribs located on the lower side of the plate is less than the height of the ribs located on imetru plate, the thermoplastic polymer used low density polyethylene and high density polyethylene secondary raw material, and further comprises an antioxidant component 10886 and mineral filler - crushed basalt, in the following ratio, wt. %:

Description

The utility model relates to devices for protection and prevention from accidental damage during construction and repair work of underground utilities, including electrical cables operating under voltage.

Known plate for closing the cable (RU 95187, IPC H02G 3/04, publ. 06/10/2010), having a rectangular shape in plan and made of thermoplastic polymer with mineral fillers. As a thermoplastic polymer, low-pressure polyethylene was used, and crushed wollastonite and quartz sand were used as mineral fillers in the following ratio of components, mass. %: low density polyethylene - 20-40, wollastonite - 10-20, quartz sand - 50-60. Waste from the production of polyethylene products and / or secondary raw materials from polyethylene are used as low density polyethylene. The bottom side of the plate can be concave in the form of a vault of cylindrical shape. On the upper side of the plate by molding, a marking and / or warning inscription can be made.

The disadvantages of the described plate for closing the cable include low mechanical and electrical strength, as well as the roughness of the front side of the plate.

As the closest analogue, a plate for closing the cable (RU 134703, IPC H02G 3/04, published on November 20, 2013), having a rectangular shape in plan and made of a thermoplastic polymer with a mineral filler and pigment, was adopted. As a thermoplastic polymer used a mixture of low density polyethylene and high density polyethylene in the ratio, mass. %: low density polyethylene - 0-50, high density polyethylene - 0-100, and building sand was used as a mineral filler in the following ratio of components, mass. %:

a mixture of low density and high density polyethylene - 15-40, building sand - 59.5-84.5, pigment - 0.5-1.0.

The pigment used is iron oxide or titanium dioxide.

The above-described plate for closing the cable has insufficient tensile strength during bending, which is expressed in the loss of integrity of the plate when a bending shock is applied during excavation. This is due, inter alia, to the presence of stress concentrators, which are the intersections of the stiffeners located on the underside of the plate with the stiffeners located around the perimeter of the plate. It is in these places that the destruction of the plate occurs when a bending shock is applied.

The utility model solves the problem of improving the mechanical properties of the plate for cable closure, in particular, increasing tensile strength during bending, without increasing its cost, through the use of secondary raw materials from low density polyethylene and high density polyethylene and additives to improve the properties of secondary raw materials, use additional mineral filler and reduce stress concentration at the intersection of stiffeners located on the lower side of the plate, with stiffeners located around the perimeter plate.

To obtain the necessary technical result in a plate for closing a cable, which has a rectangular shape in plan, stiffeners located on the lower side and around the perimeter of the plate and made of thermoplastic polymer, which is used as a mixture of low density polyethylene and high density polyethylene taken in 1: 1 proportions, of mineral filler, which is used as a building sand van, and iron oxide pigment, it is proposed to perform the height of stiffeners located on the bottom ONET slabs less than the height of ribs disposed along the perimeter of the plate. It is proposed to use secondary raw materials from low density polyethylene and high density polyethylene as a thermoplastic polymer, add 10886 antioxidant and a component of the mineral filler - ground basalt, in the following ratio of components, mass. %:

a mixture of recycled polyethylene

low density and high density polyethylene - 39; ground basalt (<0.14 mm) - 5; building sand class 1 (<0.7 mm) - 55; antioxidant 10886 - 0.5; pigment - 0.5.

In the technical solution, it is proposed to use class 1 sand, fine, the particle size of which does not exceed 0.7 mm. It is such sand, as shown by tests of material samples, that provides the necessary improvement in the mechanical properties of the material, because sand particle sizes are commensurate with the dimensions of the additionally introduced mineral filler, which makes the composition homogeneous and improves its properties.

The diagrams attached to the description of the utility model show:

in FIG. 1 - the proposed plate for closing the cable, top view;

in FIG. 2 - the same, bottom view.

In FIG. 2 adopted the following notation:

1 - stiffener located along the perimeter of the plate to close the cable;

2 - a stiffener located on the lower side of the plate to close the cable;

3 - the intersection of the stiffener located on the bottom side of the plate, with a stiffener located along the perimeter of the plate.

The proposed plate for closing the cable has a rectangular shape in plan. A warning inscription “CAUTION CABLE” is applied on the upper side of the plate by pressing. Stiffening ribs are made on the underside of the plate. The height of the stiffeners located on the lower side of the plate is less than the height of the stiffeners located around the perimeter of the plate. As tests of manufactured plate samples showed, a decrease in the height of stiffeners on the lower side of the plate leads to a decrease in the area of their interface with stiffeners located along the perimeter of the plate, which ensures a decrease in the stress concentration at the intersection of the ribs.

The plate is manufactured in the following sizes: 480 × 240 × 16 (mm) weighing 1.6 ± 1% kg, 480 × 360 × 16 (mm) weighing 2.4 ± 1% kg, 480 × 480 × 16 (mm) weighing 3, 2 ± 1% kg.

The slab is made of a mixture of secondary raw materials from low-density polyethylene 9TU 2243-176-00203335-2007 and high-density polyethylene GOST 16337-77, crushed basalt (with dimensions <0.14 mm) (TU 5769-004-80104765-2008), building class 1 sand (with dimensions <0.7 mm) (GOST 8736-93), antioxidant 10886 (Ampacet Corporation, Belgium), red - iron oxide pigment (BAUFERROX trademark manufactured by Lainxess Deatscland GmbH) (color is relevant when laying cable in light sand soil).

The use of secondary raw materials from low density polyethylene and high density polyethylene, as tests have shown, can provide good electrical insulation properties and mechanical properties of the plate for closing the cable when 10886 is added to the antioxidant composition.

Antioxidant 10886 was introduced into the formulation to prevent oxidative processes in the thermoplastic polymer, which lead to loss of mechanical strength and discoloration of the polymers. In the proposed technical solution, the used secondary raw materials partially restore the lost initial properties under the influence of the 10886 antioxidant. The tests of the mechanical properties of the samples using the 10886 antioxidant showed that it improves the physicochemical properties of the secondary polyethylene and brings them closer to the properties of the starting polyethylene, which positively affects the mechanical plate strength.

It is proposed to introduce an additional mineral filler in the form of crushed basalt. The use of crushed basalt in the formulation with particle sizes not exceeding 0.14 mm increases the resistance of the plate to deformation and cracking, increases impact resistance. The samples of plates with the addition of basalt with particle sizes greater than 0.14 mm, as shown by tests, were inferior in mechanical properties to samples of plates with basalt in which the particle sizes did not exceed 0.14 mm. The use of an additional component of the mineral filler in the form of crushed basalt with particle sizes <0.14 mm, having a fibrous shape, provides an increase in the bending stress of the plate by 60-65%, impact strength by 1.5 times and Brinell hardness by 40-43%. The particle size of basalt <0.14 mm was chosen experimentally and is most optimal for obtaining a homogeneous mass in the manufacture of plates for closing the cable.

The use of the proposed iron oxide pigment also helps to improve the mechanical properties of secondary polyethylenes.

The manufacture of the proposed plate can be carried out in known melting and heating units in accordance with the technological process.

The manufactured plate in accordance with the proposed technical solution with the implementation of the height of the stiffeners on the bottom side of the plate is 2 times less in height than the height of the stiffeners located around the perimeter of the plate, had the following technical characteristics:

The average density, g / cm ³ - 0.92-0.95 Compressive strength, kg / cm ³ - 327

Tensile strength

bending, kg / cm ² - 36

Relative discontinuous

elongation,% - 70-83 Impact strength, kJ / m ² - 6.7-8.5

Water absorption (by weight)

no more, % - 0.07

Frost resistance brand,

no less - F 300

In the proposed plate for closing the cable, water absorption significantly decreased compared to the plate - the closest analogue by 28.6 times, which has a very positive effect on frost resistance.

Thus, the manufactured plate, due to distinctive features, has increased mechanical strength compared to the closest analogue, namely:

Compressive strength increased 1.31 times;

Bending tensile strength increased by 2 times;

Water absorption (by weight) decreased by 28.6 times;

Frost resistance increased by 1.5 times.

At the same time, the cost of the proposed stove compared with the stove - the closest analogue has decreased, because In the preparation of the thermoplastic polymer, secondary raw materials from low density polyethylene and high density polyethylene are used, rather than granular low pressure polyethylene and high pressure polyethylene, supplied from the factory at a price of 93,000-98,000 rubles / ton. Recycled materials from low-density polyethylene and high-density polyethylene are extracted during the processing of municipal solid waste, while the problem of processing household waste is solved. The mass of basalt (5%), antioxidant 10886 (0.5%) is small in percentage terms and is reflected very little on the cost of the stove.

Claims (1)

A plate for closing the cable, having a rectangular shape in plan, stiffeners located on the bottom side and around the perimeter of the plate, and made of thermoplastic polymer, which is used as a mixture of low density polyethylene and high density polyethylene, taken in a 1: 1 ratio, mineral filler, which is used as building sand, and iron oxide pigment, characterized in that the height of the ribs located on the lower side of the plate is less than the height of the ribs located on imetru plate, the thermoplastic polymer used low density polyethylene and high density polyethylene secondary raw material, and further comprises an antioxidant component 10886 and mineral filler - crushed basalt, in the following ratio, wt. %: recyclable mixture low density polyethylene and high density polyethylene 39 ground basalt (<0.14 mm) 5 building sand class 1 (<0.7 mm) 55 antioxidant 10886 0.5 pigment 0.5

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