FR2531901A1 - CONCRETE MIXER EQUIPPED WITH A VIBRATOR - Google Patents

Abstract

THE INVENTION CONCERNS A CONCRETE MIXER, CONCRETE MIXER ON TRUCK IN PARTICULAR, WHOSE DRUM 1 INCLUDES A VIBRATOR ACTUATED BY A FLUID. THIS MIXER PRESENTS A HIGH EFFICIENCY WITH A SIMPLE STRUCTURE. THE VIBRATOR IS CONSTITUTED BY A TANK AT LEAST 4 AND OR 4, OF VARIABLE VOLUME BY ELASTICITY, THIS TANK BEING ALTERNATIVELY FILLED WITH FLUID, THEREFORE DILATE, THEN EMPTY. THE PREFERENTIAL FLUID IS THE MIXING WATER FOR THE CONCRETE MIXING.

Description

253190 1

  Concrete mixer equipped with a vibrator.

  The present invention relates to a concrete mixer,

  particularly on a truck, the drum of which includes a vibrator actuated by a fluid. In a known device of this kind (Patent Application 32 01 162 08), the mixing water vibrates in the drum

  one or more vibrators For this purpose, is the water

  even pulsed or drives a pulsator or a circulating turbine

  air circulation The vibrator can be made directly

  through a section of the incoming line, that the outlet

  tie of pulsed water vibrates, or by a vibrating body

  ready, which is excited by the intermittent arrival of the mixing water These vibrators make it possible to obtain the mixture

  desired during the intake period of the dilution water

  ge. Another known vibrator (DE-OS 20 05 547) is also

  intended for mixers, among others It consists essentially of

  tially of a closed space, filled with a liquid fluid.

  This space has a pressure pipe in the form of

  loop, in which a sudden strangulation on the

  course of the fluid causes gravitation phenomena, and therefore vibrations The latter, which occur in an elastic section of the pipe, are transmitted to the fluid and to the wall of the vibrator The cost of such an apparatus

  is high Its efficiency is low, the vibration gets

  naked by gravitation in the pipe which must first be

  transmitted to the casing wall by 1 not through the fluid

  before being able to be introduced into the mixture If the performance of the vibrator operating with mixing water

  is better, it is not yet optimum.

  The present invention aims to create a concrete mixer of the type described above, including the and / or the vibrators

  îo present an improved yield with a simple structure.

  According to an essential characteristic of the invention, the

  vibrator is constituted by a reservoir at least present

  as a variable volume by elasticity, this reservoir being

  alternately filled with fluid, therefore expanded, then emptied.

  The fluid flow energy is used to modify

  pride the volume of the tank, this variation transmitting

  directly kinetic energy to the mixing product.

  The energy consumed is therefore perfectly used Un

  another advantage is a relatively low manufacturing cost

  greatly reduced and simplified maintenance.

  The feature described in claim 2 allows

  to amplify the frequency of the pulses leaving the vibra-

  without increasing the demand on the

  Servoir The surface in contact with the mixture is increased.

  Furthermore, it is possible to provide two reservoirs in the drum, which thus transmit their pulses

  vibratory in different parts of the drum.

  The feature described in claim 3 sim-

  further build construction, especially with regard to

  incorporating the vibrator into the mixer The fluid used

  can be air, pressurized agent or water.

  When the tank is emptied, its volume is reduced below

  the effect of external air pressure and amixture

  biant This volume reduction can also be achieved

  linked by the characteristic described in claim 4.

  Claims 5 to 7 relate to alternative embodiments

  servoirs, the construction and operation of which

  feel different benefits so they can be chosen

  according to the dimensions and / or use of the mixer

corresponding.

  Claim 8 relates to a preferred variant of the mixer according to the invention, particularly simple and economical, the vibrator operating with the fluid

  present The brewing agent can be introduced directly

  in the mixture, during the emptying of each tank

  see Claim 9 allows more efficient feeding

  cace of water required for mixing Claims

  to 12 relate to a preferred form of construction for the arrival of water to the tanks and inside the drum.

  Mixer construction forms according to the

  vention are illustrated in the accompanying drawings, which

  present: Figure 1: a concrete mixer drum shown schematically, with a vibrator and its drive, Figure 2: another form of construction of a drum, with the vibrator and its drive, Figure 3: a third form of construction, Figures 4 6: two views and working states of a vibrator, Figure 7: a schematic supply plan, Figure 8: a longitudinal section of a distributor, Figure 9: a section along line IX IX of the figure

  8, the dispenser being in a first position

service,

  Figure 10: the same section along line IX IX, the dis-

  tributor being in a second service position.

  In FIG. 1, the concrete mixer is shown diagrammatically

  matically by its drum 1 and a water tank 2 For clarity, supporting such a drum on a vehicle,

  as well as the other accessories, have been omitted The tam-

  bour has mixing elements 3 in a spiral, fixed on its internal wall An auxiliary vibrator for mixing is mounted near the bottom of the drum lb It

  consists of a tank 4 made of elastic material This vi-

  breaker is fixed to a support 5, internal to the drum and starting from the bottom lb thereof. The support 5 comprises a pipe 6, sketched in the figure, which crosses the bottom of the drum and ends outside of the latter, in a distributor 7 The distributor is connected to a

  discharge line 8 of a pump 9, the suction side of which

  ration is connected to another part of the same distributor 7 via a second pipe 10 The suction side of the pump 9 is also connected to the water tank 2 The distributor 7 has a 1 l drive for

  a control member 12, which alternately connects the con-

  pick 6 with the suction or discharge side of this medium

  distributor for the vibrator to participate in the melan

  ge in the drum 1, the pump 9 and the drive They are put into service The tank 4 is then alternately filled with water, taking the approximate shape of a sphere, then emptied, with a parallel reduction of its volume This volume variation by pulsation permanently transmits vibrational energy to the mixture, in the area near the

253190 1

  bottom of the drum, where the major part is precisely

  product tie The energy delivered to the water by the pump

  9 is transmitted to the mixture with a high yield.

  gure 2 represents a drum similar to that of the

  gure 1 and therefore provided with the same references, including vibrator assembly Only the difference will be described below The

  support 5 receives two reservoirs 4 ', connected to the distributor

  7 by a common pipe 6 These tanks 4 'pre-

  feel a shape, of which Figures 4 to 6 give an enlarged view: membranes 15, fixed on either side of a drum-shaped body, composed of a circular wall 13 having bilateral annular flanges 14, take

  a convex shape (Figure 5) with the filling of the re-

  Servoir 4 'and a concave shape with its drain (fig-

  re 6) This last movement is helped by a tension spring 16, provided in the reservoir 4 'and coaxial with the

  circular wall 13 Connection pipes 17 per-

  put to connect the tank 4 'to the pipe 6.

  In FIG. 2, the circular wall 13 of the tanks 4 ′ is oriented towards the bottom of the drum lb In FIG. 3, the fixing of the tanks to the support 5 is such that the membranes are turned towards the bottom lb, on the one hand , and towards the opening of the drum, on the other hand The concrete mixer shown in FIG. 3 also differs

  by its distributor 7 'The latter is only very dry-

  shown in Figure 3 Figures 8 to 10 illustrate

  the details, some drawings being schematic.

  The diagram shown in Figure 7 is a power plan

  tation corresponding to the example of construction of the fi-

  gure 3 A pipe connects the water tank 2 to the vacuum side

  ration of the pump 9, with an intermediate butterfly 18.

  The discharge side of pump 9 is connected to the distributor.

  7 'through a pipe 8 A con-

  pick 10, connected to the suction side of pump 9, leaves

  from this same distributor 7 'The internal part of the distributor

  striker 7 'comprises the control member represented by a

  12 'rotary selector This 12' selector, controlled by the

  drag 11, alternately connects, via

  lines 6 ', the discharge lines 8 and as-

  piration 10 to the tanks 4 'of the vibrator,

  drum 1, the direction of rotation of which changes

  native One of the 4 'tanks is filled while the other

  tre is emptied A make-up line 21 starts on the discharge side

  Lement of the pump 9 to reach the interior of the drum 1, with a stop member 22, a water meter 23 and a

  second intermediate throttle valve 24, this pipe 21

  overlapping the drum by a nozzle 25 at least The con

  additional pick 21 makes it possible to supply the drum with mixing water. According to this diagram, the operation of the concrete mixer is as follows: water is sucked from the water tank 2, directed into the distributor 7 'by the discharge line 8 and into the nozzle 25 by the make-up line 21, when

  organ 22 is open Drive It is activated

  vice and turns the rotary selector 12 'The speed

  of rotation of this selector 12 'can be adjusted

  experimental experiment on the frequency of vibrations

  The rotation of the selector 12 'makes it possible to connect al-

  alternately the lines 6 'supplying the tanks

  4 'with the suction and / or discharge sides of the pump

  pe 9 The design of the rotary selector 12 'is such,

  that the frequency of filling and emptying of the two

  4 'towels are the same, the first one is always full

  while the water is sucked from the second If the tap water

  chage is unnecessary, the stop member 22 is closed The pump

  9 being moreover provided with a coupling, the supply

  tion of water from 4 'tanks can be shut off for assu-

  When the vibrator water supply is out of service, it is also possible to provide a

  bypass water tank 2 to nozzles 25.

  FIG. 8 represents a longitudinal section of the distri-

  7 'striker, slightly shown The 7' distributor is

  consists of a fixed casing 26, in which-the selector ro-

  tative 12 'is mounted on a bearing 27 The casing 26 and the selector 12' have an essentially tubular form

  milk with a bottom, the selector 12 'comprising a touch

  drive rillon 12 'a which crosses the casing and connects it to the drive 11 The interior of the selector 12'

  has a core 28 in the form of a pivot, this core being

  linked to drum 1 and participating in its rotation

  laughter of this core 28 comprises the sections 6 a and 6 h of the lines 6 ', supplying one of the tanks 4' The core

  also includes part of the make-up line 21.

  The casing 26 has on one side, in accordance with the number of tanks 4 ′, two connection orifices 29 for the discharge line 8, and two similar orifices 30 for the suction line 10 on the other side The discharge lines 8 and suction 9 branch before the casing into two arms connected to the orifices 29 and / 30, these arms being represented by dotted lines in the figure The two connection orifices 29 and the two similar orifices 30, corresponding to the two reservoirs 4 ', are spaced in the lengthwise direction of the casing, the axes of the first orifices 29 and 30 being located in the same first plane, those of the second orifices 29 and 30

  also located in the same background Les orifi-

  these 29 and 30 preferably occupy a radial position-

  opposite, their axes being aligned The arrangement of the

  openings of pipe sections 6 a and 6 b on the over-

  face of the core 28 is such that an imaginary rotation of

  this core 28 alternately aligns the opening of the sec-

  tion 6 a on the first pair of orifices 29 and / or 30 and

  the opening of section 6 b on the second pair ana-

  log 29 and 30 The rotary selector 12 'has recesses 31 and 32

  over its entire thickness and over part of its periphery.

  On the side of the selector 12 'oriented towards the core 28, these recesses 31 and / or 32 are extended by grooves 31 a and 32 a, which extend over the entire remaining internal periphery of this same selector 12' The recesses 31 and / or 32, with the corresponding grooves 31 a and / or 32 a, have the same spacing along the length of the selector 12 'as the adjacent connection orifices 29 and / or 30 in the casing 26 and / or the openings in sections 6 a and

6 b in the nucleus 28.

  As shown more clearly in Figures 9 and 10, the recesses 31 and 32 and the grooves 31 a and / or 32 a alternately connect the sections 6 a and / or 6 b to the connection orifices 29 and / or 30, corresponding to the pipes delivery 8 and / or suction 10, FIG. 9 reproducing the position of the selector 12 ′ illustrated in FIG. 8, FIG. 10 representing the situation a little later,

  that is to say after a certain rotation of the selector 12 '.

  In FIG. 9, the selector 12 ′ has reached a position,

  in which the start of the recess 31 allowed the connection

  dement to the orifice 29 The water is sent via the discharge line 8 into the orifice 29, the recess 31, the

  section 6 a, from which it is directed by the corresponding pipe

  laying 6 'to the tank 4' In Figure 10, the se-

  reader 12 'has made a slight rotational movement and closed the connection orifice 29 The orifice 30 is then open on the suction line 10 The water is returned from the reservoir 4' through the corresponding line 6 'and the section Ga in the groove 31 a, from where it is directed towards the pump through the recess 31 and the orifice 30 While the

  Ga section is connected to the corresponding connection orifices

  29 and / or 30, as previously described, section 6b is connected in the same way, but in reverse order, to the connection orifices 30 and / or 29 If the orifices

  29 and 30 have a radiant position with respect to each other

  opposite, the recesses 31 and 32 occupy a position

  inverted around the circumference of the selector 12 'The evi-

  31 and / or 32 preferably cover 1400 of the cir-

  selector conference Of the remaining 2200, the rai-

  nures 31 a and / or 32 a are closed on the housing The di-

  mension and / or the location of the recesses can be modified according to the requirements (recoveries for example-

  ple, to avoid water hammer).

  The section of the make-up line 21 included in the core 28, in a place not swept by the selector 12 ', is also permanently connected with the outside by means of a peripheral groove 33, provided

  on the periphery of the casing 26, core side.

  The grooves 31a, 32a and 33 allow the core 28 to have an alternative rotation according to the movements of the drum, without the connection with the outside being

  affected Furthermore, as long as their openings open

  in the corresponding grooves 31 a, 32 a and / or 33, the sections 6 a, 6 b and 21 can be indifferently

  placed inside the core 28.

  The invention is not limited to these examples of constructions.

  The tank (s) may have another structure or different forms The use of water from the mixer tank is particularly

  simple and economical Emptying the tanks can also

  They must also be provided by valves, pneumatically operated.

  or pilots, in the drum For the vibrator composed of one or more reservoirs, it is also possible to provide a particular reservoir of fluid Besides

  water, another pressurized agent and / or air may

  wind naturally ensure the expansion of the tanks.

Claims (11)

Claims.   1 Concrete mixer, especially concrete mixer on truck,   the drum of which has a vibrator actuated by a fluid   de, characterized in that the vibrator is constituted by a reservoir (4 and / or 4 ') at least having a volume   variable by elasticity, this reservoir being alternative-   filled with fluid, therefore expanded, then emptied.   2 Mixer according to claim 1, characterized in that at least two elastic tanks (4 and / or 4 ') are alternately filled and emptied.   3 mixer according to claim 2, characterized in that the tanks (4 and / or 4 ') and their fluid constitute a closed circuit.   4 Mixer according to any at least of the claims   1 to 3, characterized in that the tank has   a spring element (16) which retracts it when it is   danger. Mixer according to at least one of Claims 1 to 4, characterized in that the reservoir (4) is   essentially consists of an elastic bellows.   6 Mixer according to at least one of the claims   cations 1 to 4, characterized in that the reservoir (4 ') is   partially composed of fixed walls (13), between   what are provided elastic stretch membranes (15) -   7 mixer according to claim 6, characterized in that the tank (4 ') consists of a drum having a fixed circular wall (14) and funds constituted by membranes (15). he   8 Mixer according to at least any of the claims   1 to 7, characterized in that a pump (9), emptying and filling the tank, is connected to the   water tank (2), intended for brewing and washing.   9 Mixer according to claim 8, characterized by the   presence of a booster line (21), ensuring a supply   parallel indication of the drum (1) in stirring water.   10 Mixer according to at least any of the claims   cations 2 to 9, characterized in that a distributor (7 '), -   alternately connecting the tanks (4 and / or 4 ') to   a filling (8) and emptying (10) pipe, pre- feel   a fixed casing (26) connected to these pipes (8, 10) and pre-   feeling a circular section, at least inside,   a core (28), internal to the casing (26), comprising a sec-   tion of pipe (6 and / or 6 ') connected to one of the reservoirs   see (4 '), and an intermediate rotary selector (12'), connected to a drive, and having the shape of a hollow body   with recesses (31 and / or 32).   11 Mixer according to claim 10, characterized in that   that the core (28) forms part of the mounting of the drum bour.   12 Mixer according to one of claims 10 and 11, ca-   characterized in that the core (28) and the casing (26) include   have sections of the booster pipe (21) for the brewing water supply.