FR2609257A1 - MIXER FOR THE MANUFACTURE OF FIBER CONCRETE - Google Patents

Abstract

THE DEVICE IS INTENDED FOR USE IN THE VARIOUS BRANCHES OF INDUSTRIAL CONSTRUCTION AND CIVIL ENGINEERING TO MAKE A FIBER CONCRETE MIXTURE. THE MIXER INCLUDES A MIXING DRUM 5 ROTATING AND CONTAINING A SERVICE UNIT IN THE FORM OF COILS 8 ROTATING AROUND THEIR VERTICAL AXES. THE 8 COILS HAVE THE SAME DIAMETERS D AND NOT T AND ARE INSTALLED REGULARLY FOLLOWING THE DIAMETER D OF THE MIXING DRUM 5. THE NEIGHBORING COILS 8 TURN IN OPPOSED DIRECTIONS AND THE DISTANCE BETWEEN THEIR VERTICAL AXES IS LESS THAN THEIR DIAMETER D 'DETERMED AFTER THE FORMULA: D 1,2D (2N 1), OR D IS THE DIAMETER OF THE MIXING DRUM; N IS AN INTEGER 3.

Description

The invention relates to the building and, more particularly

  In particular, a mixer for the manufacture of fiber concrete. The most effective application of this

  invention lies in the different branches of the

  industrial engineering and civil engineering, to manufacture fiber concrete. As fibers, one can use any

  kind of fibers, including, glass fibers.

  The invention can also find applications

  in the chemical and food industries.

  One of the new building materials is the

  fiberglass concrete, the use of which

  some cases to reduce by several times the consumption of concrete and steel and even to exclude steel reinforcement

  certain building elements.

  Fiber concrete, for example, can be made from cladding slabs, balcony enclosure slabs, plumbing elements, monolithic building formwork, awning coverings and enclosures, ventilation blocks ,

  soil improvement works, floor slabs

  expensive, partitions, sidewalk slabs, window sills, cladding panels, etc.

  However, although there is a great diversity

  of fiber concrete parts, their manufacturing processes

  cation are not well developed. One of the important problems

  tants concerns the physico-mechanical properties of

  fiber concrete keys. In order to improve them, we are obliged to

  to form rigid low-temperature articles

  in water, while still maintaining homogeneity in the mixing of the mixture comprising the glass fibers without

  caking so that all the fibers are completely

sprinkled with cement paste.

  There is a mixer to prepare materials

  and high-viscosity pastes with a

  cylindrical cutter with an elastic envelope placed

  the interior provides a space filled with gas and a stirring

  rotated around its vertical axis.

  The stirrer is made in the form of

  rotating heads about their vertical axes and arranged eccentrically with respect to the axis of symmetry of the tank, the driving device being provided with a mechanism for moving cyclo-coil coils (USSR N 893 560 B28C 5/16) The disadvantage of this mixer lies in the fact that because of the high shear stresses between the rotating stirrer and the elastic envelope,

  produce mechanical damage and the destruction of

  fiber, while the construction of the agitator does not ensure intense disaggregation of fiber bundles and their regular distribution in the volume of the mixture. In addition to this, there is a partial winding

  fibers on the coils, which makes it impossible to

  hold a desired dispersed reinforcement of the mixture. In addition, the elastic envelope wears quickly because of

abrasive fillers in the mixture.

  The object of the invention is to create such a material

  range for the manufacture of fiber concrete whose

  The service unit has a construction that allows a regular distribution of fibers throughout the entire volume of the mixture, their destruction being excluded and the homogeneity

mixing is ensured.

  The goal is obtained because in the mixer

  for the manufacture of fiber concrete which comprises a

  kneader housing a service member in the form of rotating coils rotatably mounted about their vertical axes, the kneading drum and the organ

  of service being mounted movable relative to one another

  according to the invention, the coils have the

  same steps and diameter and are distributed regularly

  the diameter of the mixing drum, the coils

  neighbors moving in opposite directions and the distance

  their vertical axes being smaller than their diameter defined by the formula: d = 1,2D / (2n + 1) where D is the diameter of the kneading drum,

n is an integer> 3.

  The claimed construction of the service organ

  vice of the mixer makes it possible to mix the

  in the entire volume of the mixing drum without

  appearance of "dead zones". The chosen distance between the vertical axes of the coils ensures the commitment of their

  turns, which allows the clusters of

  and distribute them regularly in the volume of the

  mixing without caking. This ensures the homogeneity of the

  ge. In a preferred embodiment of the invention, the inclination angle of the corrugation of each coil relative to the plane perpendicular to its

  vertical axis is equal to 10 to 30.

  If the angle of inclination is less than 10, the fibers are introduced into the mixture slowly and

  the risk of damage to the fibers as a result of

serpentines increase.

  If the angle of inclination is greater than 30, the vertical flow of the mixture increases sharply, which requires a reduction in the number of turns of the coils.

  and the fibers may curl over the coils.

  In accordance with one of the construction variants

  According to the invention, the lower end portion of each coil is in the form of a cone.

  whose summit is directed towards the bottom of the drum.

  The claimed shape of the lower end portion of the coil prohibits the winding of fibers

on the streamers.

  In another alternative embodiment of the invention

  the length of the lower conical end

  of each coil is equal to (0.1 to 0.2) t o t

  is the step of a ripple of the coil.

  This reduces the frictional force

  between the bottom of the mixing drum and the mixture, the

  fiber rolling on the coils being excluded.

  It is useful if the lower conical end portion of each coil is at a distance

  of its vertical axis equal to half of its diameter.

  Such an arrangement of the end of the snake

  tin also excludes the winding of fibers on

  pentins. The invention will be better understood and other purposes, details and advantages thereof will become more apparent

  in the light of the following explanatory description

  different embodiments given only to

  non-limiting examples, with reference to the appended nonlimiting drawings in which:

  - Figure 1 represents an overview of the mixture

in service,

  - Figure 2 shows the overview of the mixture

  At the time of unloading the mixture from the kneading drum, FIG. 3 schematically represents the kneader service member.

  - Figures 4, 5 show the variants of

  Figure 6 shows a coil of the service member with a variable number of coils. The mixer has a frame 1 (Figures 1, 2)

  in the lower part of which, is mounted in

  sliding bearings, a rotary mechanism 2 with a lever 3 and a fastening means 4. The rotary mechanism

  2 carries a mixing drum 5 with a device 6d'en-

  spinning in relation to the vertical axis N-N (Figure 3). The mixing of the mixture in the drum 5 is done with the aid of a service member 7 made in the form of coils 8 rotating with respect to their vertical axes O-O (FIG. 6) installed regularly along the diameter D of the drum. 5 (Figures 3 to 5). The rotation of the coils 8 is done using a drive 9

  (Figures 1, 2) so that the neighboring coils 8 turn

  in opposite directions. The coils 8 have the same pitch (FIG. 6) and the same diameter as determined according to the formula: d = 1.2D / (2n + 1), where D is the diameter of the kneading drum;

n is an integer> 3.

  The distance between the vertical 0-0 axes of the

  coils 8 is chosen smaller than their diameter d.

  The angle of inclination of the turn of each coil 8 with respect to the plane perpendicular to its vertical axis

0-0 is 10 to 30.

  The lower end of each coil 8 has a conical shape (Figure 6), the top of the cone being directed

towards the bottom of the drum 5.

  The length 1 of the lower end portion

  The conical bottom of each coil 8 is equal to (0.1 to 0.2) t. The conical lower end portion of each coil 8 is disposed at a distance from its axis

  vertical 0-0 equal to half of its diameter d.

  The upper part of frame 1 carries a mechanism

  lifting platform 10 (Figure 1, 2) which carries through

  cable 1il the service organ 7 and which is ma-

  hand-operated by means of a steering wheel 12 through

  a chain drive 13 or a drive

  electromechanical (not shown in the drawing).

  The mixer operates as follows.

  Before proceeding to work, turn your

  12 and the cable 11 and cable 11 the service member 7 is mounted. The drum 5 is immobilized in the operating position by the fixing means 4 and the binder is loaded therewith. and water. With the help of

  lift mechanism 10, the drum 5 is lowered into the

  7, it is fixed in the service position and its drive is started simultaneously 9. The drive 6 of the drum 5 is started and this

  starts to turn. After premixing the mixture of

  46s, the fibers are added. After 1.5 to 2 minutes,

  the service member 7 is removed from the drum 5 (by disconnecting

  sing before the drives 6, 9 of the drum 5 and the service member 7 and unlocking the means of

  fixing 4). Then, using the mechanism 2, we return

  When the drum 5 is unloaded, the prepared mixture is discharged (FIG. 2) and the drum 5 is returned to the initial position. In order to avoid sticking the mixture to the walls of the drum 5 (FIGS. 4, 5), the number of coils of the

  service 7 is chosen odd (2n + 1) and the direction of rotation

  8 extreme coils is the opposite of the sense of

  of the mixing drum 5. Condition n> 3 is

  adopted to increase the horizontal component of the

  placement of the mixture and to intensify the mixing of the

  to increase the efficiency of the mixer. For example

  pl, for a diameter D of the kneading drum equal to 800 mm (D = 800 mm) and for n = 4, the number of coils is equal to (2n + 1) = 9 and

d = 1.2 x 800/9 = 106 mm.

  For the same diameter D of the kneading drum and by n = 5, the number of coils 8 is equal to (2n + 1) = 11 and

d = 1.2 x 800/11 = 87 mm.

  The optimum diameter d of coils 8 is chosen

  if considering the parameters of the fibers used.

  An important role is played by the speed of rotation

  8. Depending on the percentage of

  Forced by fibers and the diameter d of the coil 8, the speed of rotation of the coils 8 is between 450 and 1,000,000 rpm. At lower speeds, there is incomplete disintegration of fiber bundles which degrades the quality of the mixture. The defects of the finished product appeared in this case reduce its resistance

  by sub employing the capabilities of the reinforcement

persion.

  In one of the variants of the construction se-

  According to the invention, the kneading drum 5 is fixedly mounted and the service member 7 is installed with a possibility

  of rotation with respect to the N-N axis of the drum 5.

Claims (5)

  1. Mixer for the manufacture of fiber concrete which comprises a mixing drum (5) housing a service member (7) in the form of coils (8) rotatably mounted about their vertical axes (0-0),   while the mixing drum (5) and the service member   vice (7) are mounted movable relative to each other, characterized in that the coils (8) have the   same pitch (t) and diameter (d) and are installed regularly   according to the diameter (D) of the mixing drum (5), the adjacent coils (8) rotating in opposite directions   and the distance between their vertical axes (0-0) being   less than their diameter (d) determined according to the formula: d = 1.2D / (2n + 1), where D is the diameter of the kneading drum (5); n is an integer / 3.   2. Mixer for the manufacture of concrete with   1, characterized in that the angle of inclination of the turn of each coil (8) relative to the plane perpendicular to its   vertical axis (0-0) is between 10 and 300.   3. Mixer for the manufacture of concrete with   in accordance with claim 1, characterized in that the lower end portion of each   coil (8) has a conical shape and that the top of the   is directed towards the bottom of the drum (5).   4. Mixer for the manufacture of concrete for   in accordance with claim 3, characterized by   the fact that the length (1) of the lower end portion   taper of each coil (8) is equal to (0.1 to   O, 2) t, where t is the pitch of the undulation of the coil (8).   5. Mixer for the manufacture of concrete   in accordance with claims 3, 4, characterized   in that the conical lower end portion of each coil (8) is disposed at a distance from its   vertical axis (0-0) equal to half of its diameter (d).