RU1789342C - Mechanism for making tubular products - Google Patents

Abstract

Usage: in the manufacture of precast concrete and reinforced concrete, in particular in the production of vibro-hydropressed bell pipes. SUMMARY OF THE INVENTION: A device for manufacturing tubular products comprises an outer mold, a core mounted inside it. The core consists of several box-shaped segments interconnected by elastic inserts. Each segment is provided with a rod rigidly attached to it from the inside with a stop at the free end, the expanding element is located on the side of the stops facing the center of the core and is in contact with them. A source is provided in the cavity formed by the expandable member to expand it. 2 ill.

Description

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The invention relates to the production of precast and reinforced concrete products, in particular to the production of vibrohydro-pressed bell pipes.

A known installation for molding tubular products containing an external shape and a hollow core with a pressing device (expanding element) in the form of a casing of a membrane with a high thermal coefficient corrugated with longitudinal folds forms a sealed annular cavity filled with a liquid with a core that is heated and heated.

However, it is difficult and time-consuming to make a corrugated annular cavity between the casing and the core. Depending on the diameter of the pipe being formed, the membrane is replaced. In addition, a corrugated membrane is expensive;

It is difficult to work with its elastic properties under repeated tension and compression under the influence of temperatures.

A device for manufacturing tubular products is known, including an external shape, an internal composite core with a pressing device (expanding element) in the form of an elastic cover, the cavity of which is connected to a pressure source.

However, pressing pipes using a known device requires the use of rubberized covers of various diameters depending on the diameters of the pipes to be molded. On the one hand, the constant replacement of huge covers reduces the service life of covers; on the other hand, the use of all-rubber covers is associated with the production difficulties of making such covers. Hard to secure

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impermeability of a huge cover at the ends of the core, as well as install it.

The aim of the invention is to improve the usability of expanding the range of diameters of manufactured products and simplifying the design.

This goal is achieved by the fact that each segment is equipped with a rod rigidly attached to it from the inside with a stop at the free end, the expanding element is located on the side of the stops facing the center of the core and in contact with them, and is placed in the cavity formed by the expanding element source for expanding it.

Figure 1 shows the device, a General view; figure 2 is a section aa in figure 1.

The device includes an outer mold 1, inside of which a core 3 is mounted with an annular gap 2 along the axis, made in the form of a split cylinder and made up of several longitudinal sections of a box-shaped section. Rigidity ribs 5 are installed between the inner and outer sides of the 4 segments. The segments are interconnected by longitudinal elastic inserts 6. Rods 7 located in the core cavity are rigidly connected to the segments. Stops 8 are attached to the rods, resting on an expanding tubular element 9 made of elastic material (e.g. rubber) expandable by pressure testing (pressure source for a bar, not shown), or of a material with a high thermal coefficient of linear expansion (e.g. duralumin ) receiving radial expansion by heating. An electric heater 10 is installed inside it to heat the expandable element.

Installation works as follows.

The reinforced outer mold 1 is mounted on a vertically mounted core 3 and the annular gap 2 is filled between the mold and the core with a concrete mixture that is vibro-compacted (vibrator not shown).

Claims (2)

SUMMARY OF THE INVENTION A device for manufacturing tubular products containing an external form, a core inside of it made of several box-section segments interconnected by elastic inserts, an expanding element and a source After vibro-compaction of the concrete mixture, it is radially pressed by the core 3 due to the expansion of the pressurization or by pressure of an element 9 bursting 5 segments of the core through hard stops 8 on rods 7. Example 1. When performing the expanding element 9 of the tubular section from a material with a high thermal coefficient of linear expansion, it receives radial expansion when it is heated to a design temperature by an electric heater 10, conductive 5 whose cables are connected to the network using connectors (the connection diagram is not shown in the drawing), therefore, the pressing process is not assigned to certain posts. 0 EXAMPLE 2. When the expanding element 9 of the tubular section is made of elastic material, it receives radial expansion when the hydrostatic pressure in it is calculated 5 values due to crimping using a hydraulic pump station connected to the upper end of the rubber hose through the valve, and its lower end is hermetically sealed (hydraulic 0 links in the drawing are not conventionally shown). After completion of the compaction process, a conventional heat treatment of the concrete mixture is carried out by passing steam into the middle of the core. 5 Until the concrete has reached the required strength, the expanding element 9 remains connected to a source of energy (electric or pressure) to maintain its bursting forces. Then produce 0 stripping of the manufactured pipe. To do this, the power source is turned off, the press force is gradually reduced, and the voltage of the spiral frame (not shown in the drawing) is transferred to the concrete of the product. 5 After that, the core is removed from the installation and the pipe manufactured is removed by the known technology. nickname for its expansion, characterized in that, in order to increase ease of use, expand the range of diameters of manufactured products and simplify the design, each segment is equipped with a rod rigidly attached to it from the inside with an emphasis on the free end, the expandable element is located on the side of the stops facing the center of the core, and is in contact with r, - .. -: Editor O. Stenina Compiled by V. Kurdov Tehred M. Morgenthal Order 318 Circulation Subscription VNIIIPI of the State Committee for Inventions and Discover at the USSR State Committee for Science and Technology 113035, Moscow, Zh-35, Rauska nab., 4/5 by them, and in the cavity formed by the expanding element, a source is placed for its expansion. k Aa Proofreader N. Milyukov