FR2840338A1 - Transmission system for driving concrete projecting machine comprises first and second locking means fixed to ends of machine driving part and pump rotor engaging to lock relative translation of driving part and rotor - Google Patents

Abstract

The transmission system comprises first locking means (30,28) fixed to one of the first ends (24,26) of the machine driving part (18) or the pump rotor (15). There are second locking means (38) fixed to the other first end (26,24). The two locking means are able to engage together to lock translation of the rotor and the driving part relative to each other in opposite directions to each other.

Description

sleepers (10).

  ? The present invention relates to a transmission system for a concrete or mortar spraying machine, said transmission system being intended to connect together the end of a drive member and the end of the rotor of a sparrow pump. for

drive it in rotation.

  The spraying machines conform to the prior art and as shown in Figure 1A include a receiving hopper, or receptacle 10 in which is poured the concrete or mortar and said hopper 10 has an outlet orifice 12 facing which is has the Moineau 14 pump to pump, transport and spray the mortar or concrete. The rotor 15 of the Moineau pump 14 has a particular helical shape and it is engaged in a stator 16 also having a helical shape, so that the rotor 15, when it is rotated about its own axis by means of the drive member 18, simultaneously describes a rotational movement about a fixed axis. Thus, the mortar is pumped into the receptacle 10 and it is injected into a pipe connected to an outlet 20 of the pump

Sparrow 14.

  The drive member 18 extends into the hopper 10 and is itself

  even driven in rotation by motor means located in the vicinity of the hopper wall opposite to the outlet orifice 12. The drive member 18 comprises portions of Archimedean screw 22 or inclined pallets, intended to entrain the mortar to the outlet port 12. The first end 26 of the rotor 15 of the Moineau pump 14 projects into the receiving hopper 10 and is connected to the first

  end 24 of the drive member 18.

  Consequently, the first end 26 of the rotor 15 describes a hypocyclodal movement when it is rotated by the drive member 18, and it is therefore necessary to connect the drive means and the rotor 15 by said drive member 18 with a system

forming a double universal joint.

  To connect the shaft of the drive means to the drive member 18, an elastic coupling is generally used; and to connect the rotor 15 to the drive member 18, the first end 26 of the rotor 15 is provided with a sleeve having two diametrically opposite slots and the first end 24 of the drive member 18 comprises a part of which a part is capable of being engaged in said sleeve while another part is engaged in said slots. The dimensions of the parts of said piece of wind less than the internal dimensions of the sleeve and of the slots so that there is sufficient functional clearance so that the axis of the drive member 18 which is rotated, can form an angle determined with the axis of the rotor and describe a cone during its rotation around its axis. The rotor 15 and the drive member 18 are also likely to be connected

  together by an elastic coupling.

  These gimbal forming means go into the mortar and they wear out quickly. Thus, they must be relatively simple and replaced at lower cost. And in particular, said part which extends the drive member 18 must be able to be replaced easily during the

change of sparrow pump.

  When the rotor 15 of the Moineau pump 14 is rotated in a first direction to pump the mortar from the hopper towards the piping, it tends to be driven in translation, by the pressure of the pump product exerted on the rotor 15, towards the 'interior of the receiving hopper 10 and its first end 26 bears against the first end 24 of the drive member. In this way, in this first direction of rotation

  the rotor 15 is held in translation.

  On the other hand, when the rotor 15 is rotated in the opposite direction to the first saw, for example to vacuum the mortar contained in the hose or piping, the rotor 15 tends to be driven in translation in a direction opposite to the receiving hopper 10, so that the first end 26 of the rotor risks escaping from the first end 24 of the drive member 18 which drives it. In order to block it, a piece 21 forming a stop is placed against the second end of the rotor 15 and is held in a fixed position relative to the stator 16. In this way, the second end 26 of the rotor 15 comes into abutment

  against said piece 21 when it is rotated.

  A problem which arises and which the present invention aims to solve is then to provide a transmission system which allows not only to rotate the rotor but which also allows lO to overcome the part forming a stop which is necessarily located. in line with the Moineau pump and which slows the progress of the mortar and

  sometimes the formation of plugs occurs.

  To this end, the present invention provides a transmission system comprising: first blocking means integral with one of the first ends of said drive member or said rotor; and, second blocking means integral with the other first end, said second blocking means and said first blocking means being capable of cooperating together to block in translation said rotor and said drive member with respect to

  The other in opposite directions.

  Thus, a characteristic of the transmission system resides in the mode of connection between the drive member and the rotor of the Moineau pump which makes it possible to drive the rotor in rotation, but which also allows, thanks to the first and second means of blocking which cooperate together, to block in translation the rotor in the direction opposite to the drive member when it is rotated in the opposite direction to the pumping direction. In this way, it frees itself from the part forming a stop located in the axis of the pump. Obviously, when the rotor is driven in the pumping direction, its first end is likely to come into abutment against the first end of the drive member.

- 2840338

  According to a particularly advantageous embodiment of the invention, the first wind blocking means formed by a first practical recess in one of the first ends and by a rod which passes through it and which connects the two edges opposite to said first recess, said first recess opening to the outside and being capable of receiving the other first end, and in that said second wind blocking means formed by the edge of a second recess passing right through said other first end , said edge to said second recess being capable of forming a stop for said rod which passes through 10 said second recess. In this way, according to this embodiment, it is understood that when said other first end, in which the second recess is formed, is engaged in the first recess and that the rod connects the two edges opposite to said first recess by crossing the second recess, the first two wind ends blocked in translation in opposite directions from each other, a portion of rod between the two opposite edges being susceptible

  to come into abutment against the edge of the second recess.

  Obviously, according to this embodiment, the two

  first wind ends also linked together in rotation.

  However, in a preferred manner, said first recess and said other first end have straight sections extending in a determined direction, so that said rotor and said drive member are linked in rotation, independently of the locking means. Thus, the first ends having, one, a first recess of non-circular symmetry and the other a corresponding shape, wind blocked in rotation relative to each other. It is understood that the dimensions of the first recess must be greater than the dimensions of the first end which is engaged therein to allow the drive member and the rotor to form a determined angle, but that they also have to be necessarily adapted to allow locking in rotation. It suffices for this that the two opposite points closest to each other of the cross section of the first recess are spaces, by a distance less than the distance of the two most distant points from the cross section of the first end which is engaged

in said first recess.

  According to a particular embodiment of the invention, said first recess and said other first end have sections of rectangular symmetry. In this way, although said rod is capable of blocking the first two ends in rotation, the rectangular sections of the first end and of the first recess in which it is engaged makes it possible to drive the rotor effectively in

  rotation with the drive member.

  Advantageously, said first recess opens laterally on each side of said first end to form two free opposite edges. In this way, the first end engaged between the two free edges is capable of projecting on each side of said first end and of exerting maximum torque against the free edges. Thus, the transmission of the rotational movement is

  perfectly secured between the drive member and the rotor.

  In a particularly advantageous embodiment of the invention, said first end to said rotor has said first recess to receive said first end to said drive member having said second recess, said rod, integral with said first end to said rotor, being likely to cross said

  first recess and said second obviously.

  Thus, according to this embodiment, the first end of the drive member is at least partially surrounded by the free edges of the first end of the rotor which guides it in rotation when the drive member is itself even rotated, and the stem is

  secured to the first end of the rotor.

  According to another particularly advantageous embodiment of the invention, said first end to said drive member has said first recess and said first end to said rotor having said second recess is capable of being engaged in said first recess, said rod , integral with said first end to said drive member, passing through said first recess and said second recess. In this way, the first end of the rotor presents the second recess, formed by a perc, transverse age which is relatively easy to make and it is the first

  end of the drive member which presents the first recess.

  Thus, the Moineau pump which is manufactured in a standard way for many applications, is it likely to be adapted very easily for a machine to spray mortar without cost

lO additional important.

  According to an embodiment of the preferential invention, said first end to said drive member or to said rotor has a per, transverse cage traversing it right through and extending in the two edges opposite said first recess, said perc, being likely to receive said rod. In this way, the rod, passing through the first recess and the second, when the first wind ends connected together, is likely to be blocked in translation in

  the perc, age of the first extremity.

  Preferably, the rod is made up of a screw comprising a

head and a nut.

  Other features and advantages of the invention will become apparent from the

  reading of the description given below of particular embodiments

  of the invention, given for information but not limitation, with reference to the accompanying drawings in which: - Figure 1B is a partial schematic view of a mortar spraying machine in a longitudinal section, illustrating the invention according to a first embodiment; - Figure 2 is a partial schematic detail view of Figure 1 B showing the invention; - Figure 3 is a schematic view of the invention in perspective according to it illustrated in Figure 2; - Figure 4A is a schematic detail view of the invention illustrated in Figure 3 according to IVA, in a first position; - Figure 4B is a schematic detail view of the invention illustrated in Figure 4A, in a second position; - Figure 4C is a schematic detail view of the invention illustrated in Figure 4A according to IVC, in a third position; - Figure 5A is a detail view of the invention according to another embodiment; and, Figure 5B is a cross-sectional view of the invention

  illustrated in Figure 5A, according to VB.

  Figure 1B partially and schematically illustrates a machine for transporting and spraying mortar. The machine comprises a receptacle 10 into which the mortar ready to be sprayed is introduced; the receptacle 10 presents an outlet orifice 12 opening into a Moineau pump 14. The Moineau pump 14, comprises a rotor 15 of helical shape, mounted in a stator 16 whose internal shape is complementary to the rotor 15. The rotor 15 is driven in rotation by means of a drive member 18 which is. itself rotated about its axis by means of drive not shown. Thus, the mortar is capable of being pumped into the receptacle 10 to be injected into a pipe, not shown, connected to an outlet 20 of

the sparrow pump 14.

  The drive member 18 extends in the bottom of the receptacle, substantially in the axis of the sparrow pump 14 and it is connected to motor means located near the wall of the receptacle 10 opposite the outlet orifice. 12. The mortar is entrane towards this outlet orifice 12 by means of an Archimedean screw 22 mounted on the member

training 18.

  The connection of the drive member 18 and the rotor 15 requires a special device, because the rotor 15 of the Moineau pump, when rotated about its axis simultaneously describes a rotational movement in the stator 16 around of a fixed axis. Thus, the drive member 18 has a first end 24 which is connected to the first end 26 of the rotor 15 by the transmission system object of the invention forming a gimbal, which will be described in

  the rest of the description, with reference to Figures 2 and 3 in a first

  time. FIG. 2 illustrates in detail the connection mode between the first end 24 of the drive member 18 and the first end 26 of the rotor 15, as shown in FIG. 1 B. Wile also shows, in top view, a rod 28 which will be described more precisely in

1O reference to Figure 3.

  In this Figure 3, we find in perspective the first end 26 of the rotor 15 and the first end 24 of the member

  drive 18, as well as the rod 28.

  The first end 26 of the rotor 15, of cylindrical symmetry, has a first substantially parallelepiped recess 30 opening outside on the axis of said first end 26 and on the two diametrically opposite sides. The mean plane of the recess 30 comprises the axis of the first end 26 and divides it into two edges

free opposites 32,34.

  The first end 24 of the drive member 18 consists of a piece 36 forming a flat part, connected by screwable means

  37, fac, it can be easily removed and replaced in case of wear.

  The part 36 is capable of being inserted into the first recess 30 between the two free edges 32, 34. To do this, its thickness is less than the distance which separates the two free edges 32, 34. In addition, the part 36 has a second recess 38 passing right through it, extending longitudinally and being capable of being arranged with regard to a perc, transverse age 40 passing through the two opposite free edges 32, 34. so, the rod 28, formed for example diune screw having a head 42 and a nut 44, passes through said perc, transverse age and the second recess 38 and it is held in a fixed position relative to the rotor 15 by tightening the nut 44, thanks to the screwable means 37, the piece 36 forming a flat part It is understood that the drive member 18 and the rotor 15 are linked in rotation and in translation and that they are blocked in translation in opposite directions one of the other by the rod 28. However, a functional longitudinal play exists between the drive member 18 and the rotor thanks to the second recess 38 which extends longitudinally. Thus, when the rotor 15 is driven in the opposite direction of rotation to the pumping direction to disengage the mortar from the pump, for example, the rotor 15 which tends to sink into the stator 16 and escape the member d 'drive which controls it, is retained by the rod 28 and the part 36 which it crosses. FIG. 4A illustrates this rear configuration in which the rotor 15 is actuated in the opposite direction by the member

training 18.

  In this Figure 4A, we find the first two ends 26 and 24, engaged one inside the other, a middle portion of the rod 28 being in abutment against the edge 46 of the second recess 38 opposite the drive member 18. In this way, it is understood that the piece 36 is kept engaged between the two opposite edges 32, 34 and that the first end 24 is linked in rotation with the first end 26

  of the rotor and that it is likely to drive it in rotation.

  In addition, as illustrated in FIG. 4A, the drive member 18 and the rotor 15 form between them a determined angle substantially less than 180, during the double rotational movement of the first end 26 of the rotor 15, according to its own axis and around a fixed axis. As illustrated in FIG. 4C, to allow the relative displacement of the two ends 26, 24, during the double rotation it is necessary that there is on the one hand a first functional clearance of the piece 36 between the two opposite edges 32, 34, and on the other hand between the rod 28 and the second recess 38

which is oblong.

  FIG. 4B illustrates the transmission system, object of the invention, when in operation, the rotor 15 is driven in the direction of rotation correspond to the pumping and that the substantially rounded end 48 of the part 36 abuts against the internal wall 49 of the recess 30 forming a ball joint. In this operating mode

  normal, the rod 28 is not stressed to retain the rotor 15.

  According to another embodiment of the covers of the invention illustrated in FIG. 5A and in which there is the first end 24 of the drive member 18 and the first end 26 of the rotor 15, a first recess 50 is formed in the first end 24. The first end 26 of the rotor 15 is engaged in the first recess lO 50 and has substantially smaller dimensions in order to be able to

  tilt the drive member 18 relative to the rotor 15.

  As illustrated in FIG. 5B, which corresponds to a section perpendicular to the plane of FIG. 5A, the first recess 50 is of substantially square shape and it defines two first opposite edges 52, 54 and two second opposite edges 56, 58. The first end 26 of the rotor 15 has the same corresponding square shape in a manner, con to block in rotation the first ends 24, 26 relative to one another. Obviously, the section of the first end 26 of the rotor is substantially smaller than the section of the first recess 50 of the

  first end 24 to ensure functional play.

  The first two opposite edges 52, 54 each have a bore 60 with a common axis substantially perpendicular to the axis of the drive member 18. The first end 26 of the rotor 15 has a second recess 62 passing right through it part and a portion of which is disposed between the drills, ages 60 of the two opposite edges 52, 54. The drills, ages 60 and the second recess 62 are traversed by a rod 64 formed by a screw having a head 66 and held in position fixed on

  the first end 24 of the drive member 18 by a nut 68.

  Figures 5A and 5B show that the second recess 62 has dimensions greater than the section of the rod 64 and this, to allow the inclination of the rotor 15 and the drive member 18, one

compared to each other.

  In FIG. 5A, the drive member 18 drives the rotor 15 in the opposite sound to the pumping sounds of the mottler from the receiving hopper to the outside, so that the rotor 15 is driven in translation in the opposite direction to the drive member 18 and that the middle portion 70 of the rod 64 bears against the edge 72 of the second recess 62, oriented towards the drive member 18. In this way, the rotor 15 is locked in translation relative to the drive member 18 and the first end 26 of the rotor 15 cannot disengage from the first end 24 of the drive member 18. Thus, the first ends 24, 26 wind kept locked in rotation rune compared to the other, and the drive member 18 is susceptible

to drive the rotor 15 in rotation.

Claims (9)

  1. Transmission system for a machine for spraying concrete or mortar, said transmission system being capable of connecting together the first end of a drive member passing through the receiving hopper of said machine and the first end of the rotor. a Moineau pump for driving it in rotation, said rotor of said Moineau pump extending the outlet orifice of said receiving hopper, characterized in that it comprises: 1O- first blocking means (30, 28; 50, 64) integral with one of the first ends (24, 26) to said drive member (18) or to said rotor (15); and, - second locking means (46, 38; 72, 62) integral with the other first end (26, 24), said second locking means (46, 38; 72, 62) and said first locking means (30, 28; 50, 64) being capable of cooperating together to block in translation said rotor (15) and said drive member (18) relative to each other   in opposite directions from each other.   2. Transmission system according to claim 1, characterized in that the first wind blocking means formed by a first recess (30, 50) practical in one of the first ends (26, 24) and a rod ( 28, 64) which passes through it and which connects the two opposite edges (32, 34; 52, 54) to said first recess (30, 50), said first recess (30, 50) opening to the outside and being capable of receiving the other first end (24, 26), and in that said second wind blocking means formed by the edge (46, 72) of a second recess (38, 62) passing right through said other first end ( 24, 26), said edge (46, 72) to said second recess (38, 62) being capable of forming a stop for said rod (28, 64) which passes through said second obviously (38, 62).   3. Transmission system according to claim 2, characterized in that said first recess (30, 50) and said other first end (24, 26) have straight sections extending in a determined direction, so that said rotor (15) and said member   (18) are linked in rotation.   4. Transmission system according to claim 3, characterized in that said first recess (30, 50) and said other first   ends (24, 26) have sections of rectangular symmetry.   5. Transmission system according to any one of   claims 2 to 4, characterized in that said first recess (30,   ) laterally opens on each side of said first end   1O (26) to form two free opposite edges (32, 34).   6. Transmission system according to any one of   Claims 2 to 5, characterized in that said first end (26)   to said rotor (15) presents said first recess (30) to receive said first end (24) to said drive member (18) presenting said second recess (38), said rod (28), integral with said first end (26) to said rotor (15), being capable of passing through said first   recess (30) and said second recess (38).   7. Transmission system according to claim 6, characterized in that said first end (24) of the drive member (18) consists of a piece (36) forming a flat, connected by means screwable (37).   8. Transmission system according to any one of   Claims 2 to 5, characterized in that said first end (24)   to said drive member (18) has said first recess (50) and in that said first end (26) to said rotor (15) having said second recess (62) is capable of being engaged in said first recess (50) , said rod (64), integral with said first end (24) to said drive member (18), passing through said first recess (50) and said second obviously (62).   9. Transmission system according to any one of   Claims 2 to 8, characterized in that said first end (24)   to said drive member (18) or to said rotor (15) has a transverse hole (40) passing right through it and extending in the two opposite edges (32, 34; 52, 54) to said first obviously (30, 50), said