JP4708328B2 - Grout pump - Google Patents

Abstract

The cement and mortar mixing pump has a powered impeller screw (14) in a funnel (12) to be filled with the materials for mixing. The mixing chamber (18), separately between the funnel and the pump flange (20), is a component fastened to the funnel where the mixing chamber cladding (52) is in direct contact with the funnel and the pump flange. A number of liquid spray jets are held in a jet carrier, fitted within a recess in the chamber cladding to lie flush with its inner surface, in a release mounting which can be accessed externally.

Description

The present invention relates to a grout pump of the type described in the first part of claim 1. A grout pump of this type is described in German Patent Application DE 3809661 A1 (Patent Document 1).
German Patent Application Publication DE 3809661 A1

  Grout pumps of the type described above are those that automatically mix dry materials such as prepared grout or cement supplied primarily in a bag or in storage containers with water and the required additives. For example, it is used in tunnel construction.

  The grout pump known from Patent Document 1 is improved in performance as compared with a grout pump having a general configuration, but deposition still remains in the mixing chamber region, and cleaning of the mixing chamber region is difficult. is there.

  An object of the present invention is to propose a grout pump that hardly accumulates in the mixing chamber region, requires a small cleaning cost, and can be easily cleaned as a whole.

  Such a problem is solved according to the present invention by a grout pump having the characteristics described in claim 1.

  In the present invention, the screw conveyor for introducing the material to be mixed into the mixing chamber is arranged not in the mixing tube but in the lower portion of the hopper for filling the material to be mixed. Since the hopper continues around the screw conveyor and to the lower area, the conveyance efficiency is improved especially by making the material flow uniform. This is because, in this critical region, there is no obstacle edge or transition between the metal portion and the lining, and there is no fear of formation of dead zones and deposits. In the prior art, deposits could form mainly at the transition between the filling hopper and the mixing tube lining. The hopper can be a one-piece body or can be a split structure, in particular a two-part structure in the cross section.

  In the present invention, the mixing chamber connected to the hopper is a structural member formed separately from the hopper and the pump flange and coupled to the hopper, and this structural member is preferably made of polyurethane over the entire length. It has a polyethylene or silicone lining. This lining is formed at the time of injection molding of a mixing chamber having a cylindrical shape, or is arranged at a predetermined position by press-fitting a corresponding molded body. Such shaped bodies have a rubber layer on the side to be bonded to the metal. This rubber layer forms a joint with a material such as polyurethane, polyethylene, or silicone, and adheres to a metal or the like. The lining has a very smooth and solid inner surface so that the mixed material does not substantially adhere. The lining is preferably molded so as to move from the hopper to the mixing chamber without a step.

  The pump flange that localizes the mixing chamber at the pump end preferably comprises a polyurethane, polyethylene or silicone cover over the entire grout guide area on the side facing the mixing chamber. This cover is in direct contact with the mixing chamber lining. Similarly, the cover of the pump flange can be formed by a process such as spraying a polyurethane material onto a desired surface of the pump flange. As another possibility, a pre-formed body can be snap-coupled to the through hole of the pump flange.

  Furthermore, in the present invention, a plurality of fluid ejection nozzles are disposed on the nozzle carrier. The nozzle carrier is disposed in the lining gap so as to be at least substantially in the same plane with respect to the inner surface of the lining, and is detachably fixed by fixing means operable from the outside of the mixing chamber. With such an embodiment, on the one hand, the risk of deposit formation in the region of the fluid ejection nozzle is significantly reduced and on the other hand the fluid ejection nozzle can be easily cleaned. When the nozzle carrier is released from the outside, the nozzle carrier can be taken out from the mixing chamber.

  According to the grout pump according to the present invention, the overall operation characteristics and maintainability are remarkably improved based on the above-described features.

In the present invention, by disposing a plurality of fluid ejection nozzles on the nozzle carrier, it is possible to easily dispose these fluid ejection nozzles so that fluid is ejected at different ejection angles . This makes it possible to clarify the desired arrangement arrangement, for example, all the fluid injection nozzles may be arranged at different injection angles, or several fluid injection nozzles may be arranged at the same injection angle. Is possible . Needless to say, all the fluid ejection nozzles can be arranged at the same ejection angle. However, in general, it disposed in at least two spray angle fluid ejection nozzle, it is preferable to be realized quickly and evenly wetting of the materials to be mixed.

In the present invention, the fluid ejection nozzle can be formed on the nozzle carrier itself. In the case of a metal nozzle carrier, the nozzle can be formed by etching or laser processing, and in the case of a plastic nozzle carrier such as polyurethane, polyethylene, or silicone, it can be formed by injection molding or the like. Alternatively, the fluid ejection nozzle can be formed as a separate insert member carried by the nozzle carrier, in which case the nozzle carrier is preferably made of metal, in particular special stainless steel. The insert member is preferably made of plastic such as polyurethane, polyethylene, or silicone, but may be made of metal. Each insert member is preferably provided with a plurality of fluid ejection nozzles. As one embodiment, a plurality of fluid ejection nozzles in each insert member can be arranged at the same ejection angle . In that case, it is advantageous to form the insert member so that it can be inserted into the nozzle carrier at two locations separated from each other by 180 °. Two different injection angles can be realized by using insert members having the same configuration. In that case, one insert member is inserted into one position on the nozzle carrier, and another insert member is inserted into another position.

  Regardless of whether the fluid ejection nozzle is formed on the nozzle carrier itself or an insert member supported by the nozzle carrier, liquid is supplied from a common supply pipe to all fluid ejection nozzles corresponding to the nozzle carrier. It is preferable to do this. In this case, the number of grout pump external connections is significantly reduced. In this embodiment, it is preferred to connect a distribution element between the end of the supply tube and the nozzle carrier. This distribution element distributes liquid from the supply pipe to each fluid ejection nozzle. The distribution element can be composed of a plastic molding. As the material, a material is selected that forms a seal between the supply pipe and the outer surface of the mixing chamber.

  In a preferred embodiment of the grout pump according to the invention, the screw conveyor is also provided with a coating made of polyurethane, polyethylene or silicone in order to further improve the operational safety. In one embodiment, the screw conveyor can be made of steel only on the inner shaft, and each worm can be made entirely of polyurethane, polyethylene or silicone.

In the present invention, in order to reliably prevent material accumulation at the end of the screw conveyor far from the mixing chamber, the polyurethane is formed on the motor flange adjacent to the end of the screw conveyor far from the mixing chamber on the side facing the hopper. Ltd., provided with a polyethylene or silicone lining. The lining, in a preferred embodiment, comprises a molded sealing lip for sealing the drive shaft of the screw conveyor.

  Hereinafter, the present invention will be described more specifically with reference to the illustrated preferred embodiments.

  FIG. 1 is a perspective view of the grout pump 10 as viewed obliquely from above. The grout pump 10 includes, as its main parts, a screw conveyor 14 disposed in the hopper 12, an electric motor 16 disposed on one side of the hopper 12 for driving the screw conveyor 14, and the other side of the hopper 12. It includes a mixing chamber 18, a pump flange 20 that localizes the mixing chamber 18 on the side away from the hopper 12, and an eccentric worm pump 22 that is connected to the mixing chamber 18 via the pump flange 20.

  FIG. 2 showing the longitudinal section of the grout pump 10 clearly shows the structure of each component. At the left end portion of the grout pump 10 in FIG. 2, an electric motor 16 represented in a diagram for rotating the screw conveyor 14 is located. The electric motor 16 is coupled to one end of a steel shaft 26 that constitutes the core of the screw conveyor 14 via a motor clutch 24. The shaft 16 passes through the center of the screw conveyor 14. The electric motor 16 is coupled to the hopper 12 via a motor flange 28 described later.

  The hopper 12 in the illustrated example has a two-part structure, and is composed of a lower part shown and an upper part not shown. The upper part is enlarged relative to the lower part and is intended to fill the grout pump 10 with the building material to be mixed. The upper part of the hopper 12 is removable in order to facilitate handling during transportation of the grout pump 10. As shown, a closing lever 30 is disposed in the upper region of the lower part of the hopper 12. When removing the upper part of the hopper 12 for transportation, the filling opening of the hopper 12 is closed by the closing lever 30. The two-part hopper 12 is preferably made of a stainless steel plate.

The screw conveyor 14 is disposed in the lower part of the hopper 12 in the vicinity of the bottom thereof , and the building material filled in the hopper 12 is pushed rightward from the hopper 12 by the rotation and introduced into the mixing chamber 18. In the illustrated example, the helical worm of the screw conveyor 14 is made entirely of polyurethane and forms part of a pre-formed polyurethane coating 32 that is mounted or press-fit onto the shaft 26. As shown in the figure, the screw conveyor 14 does not penetrate only the lower part of the hopper 12 in the axial direction over the entire length, but slightly enters the mixing chamber 18. The end of the shaft 26 on the side farther from the motor of the screw conveyor 14 located in the mixing chamber 18 is coupled to the mixing member 36 via the clutch 34. The mixing member 36 is rotationally driven by the screw conveyor 14 and mixes one or more kinds of liquids such as water with the building material introduced into the mixing chamber 18. This liquid is supplied into the mixing chamber 18 by a fluid ejecting apparatus 38 to be described later. The mixing member 36 comprises a series of blades 40 that are spaced apart from each other in the circumferential and axial directions. The blade 40 is fixed to a hollow cylindrical base member 42. The base member 42 is coupled to a steel shaft 44 passing therethrough so as to be integrally rotatable.

  The end 46 of the rotor 48 in the eccentric worm pump 22 extends into the mixing chamber 18 through the pump flange 20 that localizes the end of the mixing chamber 18 far from the hopper. The end portion 46 of the rotor 48 is coupled to a butt end portion of the mixing member 36 via another clutch 50 so as to be integrally rotatable. Therefore, when the screw conveyor 14 and the mixing member 36 are rotated, the rotor 48 is also rotated. Both clutches 34 and 50 not only transmit the above-mentioned rotational motion, but also act as hinges for absorbing the eccentric motion generated when the rotor 48 of the eccentric worm pump 22 rotates. Since the eccentric worm pump 22 fixed to the pump flange 20 has a conventional structure and a known function, the description thereof is omitted. Further, the filling process, the introducing process, and the mixing process in the grout pump 10 are also known to those skilled in the art from the above-mentioned Patent Document 1 and the like, and thus description thereof is omitted.

  In order to sufficiently avoid the accumulation of material in the grout pump 10, the grout pump 10 according to the present invention has the following characteristics. First, as shown in FIG. 3, the mixing chamber 18 formed of a structural member separate from the hopper 12 and the pump flange 20 is provided with a polyurethane lining 52 throughout the interior thereof. In the illustrated example, the lining 52 is formed of a molded body that has been molded in advance, and is press-fitted into a metal hollow cylinder 54 for fixing the mixing chamber 18. The polyurethane lining 52 has a smooth inner surface and a series of circumferential grooves 56 on the outer surface. These circumferential grooves 56 improve the flexibility of the polyurethane lining 52 in the longitudinal direction. In particular, as shown in FIGS. 1 and 2, the polyurethane lining 52 is drawn from the mixing chamber 18 at the end of the hollow cylinder 54, and the sealing performance of the mixing chamber 18 not only for the hopper 12 but also for the pump flange 20. Is to improve. Further, in the illustrated example, the polyurethane lining 52 is formed with two annular seal lips 58 and 59 on the end face of the radial drawing region facing the pump flange 20. These seal lips 58 and 59 further improve the sealing performance for the pump flange 20.

  The fluid ejection device 38 is also configured to avoid the accumulation of the mixing chamber 18 as much as possible in the device area. The fluid ejection device 38 includes a nozzle carrier 60. The nozzle carrier 60 according to the illustrated example has a vertically long shape, and is in the same space or substantially in the same plane with respect to the inner surface of the polyurethane lining 52 within the corresponding gap 62 of the polyurethane lining 52. Is arranged. The nozzle carrier 60 is made of stainless steel in the above-described embodiment, and includes two insert members 64 as clearly shown in FIGS. 3 and 4. Each of these insert members 64 is provided with two fluid ejection nozzles 66. That is, the fluid ejection device 38 has four ejection nozzles 66 in the illustrated example. In this example, the insert member 64 is made of polyurethane, but may be made of other suitable plastic material or metal material. In another embodiment not shown, the injection nozzle 66 is formed on the nozzle carrier 60 itself.

All the injection nozzles 66 can be arranged at the same injection angle . However, to wet even more evenly and quickly Oite materials to be mixed into the mixing chamber 18, it is preferable to place at different injection angles different injection angles fluid injection nozzle 66 to one another, especially as pairs. Although illustration is omitted, it goes without saying that three or more insert members can be provided on the nozzle carrier 60. Each insert member 64 is provided with one or a plurality of injection nozzles 66. When a plurality of injection nozzles 66 are provided for one insert member 64, the injection nozzles 66 are arranged at the same or different injection angles. Can do. Moreover, it is also possible to arrange a plurality of nozzle carriers 60 as required.

  In the illustrated example, the nozzle carrier 60 is held by two countersunk screws 68. The shaft of the countersunk screw 68 passes through the nozzle carrier 60, the polyurethane lining 52, the hollow cylinder 54, the distribution element 70, and the fixing flange 72 outward in the radial direction. As an alternative structure, a corresponding threaded bolt can be fastened to the nozzle carrier 60.

  The fixed flange 72 is coupled to the end of a supply pipe 74 for supplying liquid to the fluid ejection device 38. The end of the supply pipe 74 communicates with a distribution element 70 disposed between the fixed flange 72 and the hollow cylinder 54. Since a corresponding channel or an appropriate air gap is provided inside the distribution element 70, the liquid is guided from the supply pipe 74 to each fluid ejection nozzle 66 through the corresponding opening of the hollow cylinder 54 and the polyurethane lining 52. . At the same time, the distribution element 70 seals between the supply tube 74 and the mixing chamber 18, strictly the outer surface of the hollow cylinder 54. The distribution element 70 is preferably made of rubber or plastic material such as polyurethane having sufficient elasticity. As a result, good sealing performance is reliably exhibited, and the required channel or air gap can be easily positioned with respect to the distribution element.

  The distribution element 70 is fixed between the fixing flange 72 and the outer surface of the hollow cylinder 54 using screws 68 and nuts 76 (see FIGS. 3 and 4). When the insert member 64 is removed for cleaning or replacement, the nozzle carrier 60 can be taken out together with the insert member 64 simply by loosening the nut 76.

  In order to prevent material deposition in the area of the pump flange 20, the surface of the pump flange 20 facing the mixing chamber 18 is covered with a polyurethane cover 78 over the entire material guide area. The cover 78 is formed of a polyurethane molded body 80 in the illustrated example, and this molded body 80 is snap-coupled to a through-hole provided at the center of the pump flange 20. Through this through hole, the end 46 of the rotor 48 also projects into the mixing chamber 18. The molded body 80 made of polyurethane conforms to the shape of the through hole and is securely fixed to the pump flange 20 even after the snap connection. In particular, as shown in FIG. 5, the molded body 80 made of polyurethane is urged radially outward on both sides of the pump flange 20, so that the seal lip 58 radially inward on the side facing the mixing chamber 18. In contact with the eccentric worm pump 22, it functions as a seal between the stator 82 of the eccentric worm pump 22 and the pump flange. As shown in FIG. 5, the annular portion 84 of the polyurethane molded body 80 is disposed in a corresponding recess in the pump flange 20 on the mixing chamber 18 side. This recess extends radially outward such that the radially outer seal lip 59 in the polyurethane lining 52 contacts the metal material portion of the pump flange 20 rather than the annular portion 84. Alternatively, the cover 78 can be molded by spraying polyurethane material onto the pump flange 20 (not shown).

  In the illustrated grout pump 10, the area of the motor flange 28 is also protected against deposition. As shown in FIG. 6, a polyurethane lining 86 is provided on the side of the motor flange 28 facing the hopper 12. On the one hand, this lining 86 seals the motor flange 28 against the outer surface of the hopper 12, and on the other hand, an annular seal lip 88 formed on the lining so as to project obliquely inward toward the hopper 12, the motor during rotation. Seal against the clutch 24. The polyurethane lining 86 is an annular disk member except for the seal lip 88 formed on the lining, and is fixed to the motor flange 28 by, for example, bayonet coupling. In addition, an effective seal is realized between the internal space of the hopper 12 and the electric motor 16, and unwanted material accumulation in the region is prevented.

It is a perspective view which shows the grout pump by one Embodiment of this invention. It is a longitudinal cross-sectional view of the pump of FIG. It is a perspective view of the mixing chamber in the pump of FIG.1 and FIG.2, and the liquid supply apparatus is disassembled and shown. It is sectional drawing which shows the assembly state of a liquid supply apparatus. It is an expanded sectional view which shows the pump flange area | region in the pump of FIG.1 and FIG.2. It is an expanded sectional view which shows the motor flange area | region in the pump of FIG.1 and FIG.2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Grout pump 12 Hopper 14 Screw conveyor 16 Electric motor 18 Mixing chamber 20 Pump flange 22 Eccentric worm pump 24 Motor clutch 26 Steel shaft 28 Motor flange 30 Interlocking rod 32 Polyurethane coating 34 Clutch 36 Mixing member 38 Fluid injection device 40 Blade 42 Base member 46 End 48 Rotor 52 Polyurethane lining 54 Hollow cylinder 56 Peripheral groove 58, 59 Annular seal lip 60 Nozzle carrier 62 Air gap 64 Insert member 66 Fluid injection nozzle 68 Countersunk screw 70 Distributing element 72 Fixing flange 74 Supply pipe 76 Nut 78 Cover 80 Molded portion 82 Stator 84 Annular portion 86 Lining 88 Seal lip

Claims (14)

A grout pump (10) comprising a screw conveyor (14) driven by a motor for introducing the material to be mixed into the mixing chamber (18),
The mixing chamber (18) has a rubber or plastic lining (52), is at least approximately coaxial with the screw conveyor (14) and has one or more fluid jets; A mixing member (36) capable of supplying a liquid through a nozzle (66) and rotating together with the screw conveyor (14) for mixing the liquid to be mixed and the liquid introduced into the mixing chamber (18). Is disposed in the mixing chamber (18), and a pump flange (20) for coupling the pump (22) is provided at the end of the mixing chamber (18) on the side far from the screw conveyor (14). Grout pump
-The screw conveyor (14) is placed in a hopper (12) for filling the material to be mixed;
The mixing chamber (18) is composed of a structural member coupled to the hopper (12), separate from the hopper (12) and the pump flange (20);
The lining (52) of the mixing chamber (18) is in direct contact with the surfaces of the hopper (12) and the pump flange (20),
A plurality of fluid ejection nozzles (66) are provided in the nozzle carrier (60), and the nozzle carrier (60) is disposed in the gap of the lining (52) at least substantially in the same plane as the inner surface of the lining (52); And detachably fixed by fixing means operable from the outside of the mixing chamber (18) ,
-A motor flange (28) adjacent to the end of the screw conveyor (14) on the side away from the mixing chamber is provided with a polyurethane, polyethylene or silicone lining (86) on the side facing the hopper The grouting pump characterized in that the lining (86) is provided with a seal lip (88) for sealing the drive shaft of the screw conveyor (14) . The grout pump according to claim 1,
-A cover (78) made of polyurethane, polyethylene or silicone is provided on the pump flange (20) over the entire region through which the grout passes on the side facing the mixing chamber (18). Grout pump. The grout pump according to claim 1 or 2,
A grouting pump, wherein the plurality of fluid ejection nozzles (66) are arranged at different ejection angles. In the grout pump as described in any one of Claims 1-3,
A grouting pump characterized in that the fluid ejection nozzle (66) is formed in the nozzle carrier (60) itself. In the grout pump as described in any one of Claims 1-3,
A grout pump, wherein the fluid injection nozzle (66) is configured as a separate insert member (64) carried by the nozzle carrier (60). The grout pump according to claim 5,
-A grout pump, wherein each of the insert members (64) is provided with a plurality of the fluid jet nozzles (66). The grout pump according to claim 5 or 6,
-A grout pump, wherein the plurality of fluid injection nozzles (66) in each of the insert members (64) are arranged at the same injection angle. In the grout pump as described in any one of Claims 5-7,
-A grout pump characterized in that the insert member (64) is made of polyurethane, polyethylene or silicone. In the grout pump as described in any one of Claim 4 or 5-8,
A grouting pump for supplying liquid to all the fluid ejection nozzles (66) corresponding to the nozzle carrier (60) by a common supply pipe (74); The grout pump according to claim 9,
-Supply of liquid from the supply pipe (74) to all the fluid ejection nozzles (66) by means of a distribution element (70) connected between the end of the supply pipe (74) and the nozzle carrier (60); A grout pump characterized by The grout pump according to claim 10,
A grout pump characterized in that the distribution element (70) can seal between the supply pipe (74) and the mixing chamber (18). In the grout pump as described in any one of Claims 1-11,
-A grout pump characterized in that the cover (78) of the pump flange (20) is formed of a polyurethane, polyethylene or silicone molded part snap-bonded to a through hole. In the pump as described in any one of Claims 1-12,
A pump characterized in that the screw conveyor (14) is provided with a coating (32) made of polyurethane, polyethylene or silicone. In the grout pump according to any one of claims 1 to 13,
A grouting pump characterized in that the lining (52) of the mixing chamber (18) is made of polyurethane, polyethylene, silicone, or a laminated material of any one of these and rubber.

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