JP2016528433A - Two-cylinder viscous material pump with pipe switching part - Google Patents

Abstract

The present invention has two transfer cylinders each having a hopper (10) and end-side merging openings (18, 19) and connected to passage openings (18 ', 19') of the hopper wall (20). It is related with the pump for viscous substances provided with (16,17). The transfer cylinders (16, 17) are moved by the pipe switching unit (24) disposed inside the hopper (10) while the transfer pistons (22, 23) alternately perform the filling stroke and the transfer stroke. , Alternately connectable to the hopper interior (21) and the transport line (14). The pipe switching part (24) has an inflow opening formed as a long hole (28) curved in an arc shape indicating the direction of the confluence opening (18, 19), and its width is the confluence opening ( 18 and 19), the length of which corresponds to the outer spacing of the merging openings (18, 19), and the inflow openings each sway the outer end of the slot in the swinging direction. It has a closing projection (30, 31) extending beyond, and the extension corresponds to the spacing between the merging openings. In order to ensure a reliable sealing of the separation point between the pipe switching part (24) and the hopper wall part (20), according to the present invention, the pipe switching part (24) has an arc-shaped elongated hole (28). Having a metal ring element (32) having a ring element (32) and an oscillating pipe (34) connected to the conveying line (14) on the discharge side. Having a cushion member (36) having an opening (38) surrounding the slot (28), wherein the ring element (32) is in relation to the oscillating tube (34) It is relatively movable in the axial direction, and can be pressed against the inner surface of the hopper wall portion 20 via the cushion member (36) under the action of the conveying pressure in the pipe switching portion (24). That is proposed.

Description

  The present invention relates to a viscous material pump including a hopper (material supply container) and two transfer cylinders (pressure feed cylinders) each having a merging opening on the end side and connected to a passage opening of a hopper wall. The two transfer cylinders can be alternately connected to the inside of the hopper and to the transfer line (discharge pipe) by a pipe switching portion disposed inside the hopper, and the transfer pistons are alternately connected. In addition, a filling stroke and a transport stroke (pressure feed stroke) are performed.

  From Patent Document 1, the pipe switching portion has an inflow opening formed as a long hole curved in an arc shape indicating the direction of the confluence opening, the width of which corresponds to the diameter of the confluence opening, and The length corresponds to the outer space of the merging opening, and the inflowing opening has a closing protrusion that extends beyond the outer edge of the inflowing opening in the swinging direction, and the extension is the merging opening. Corresponding to the spacing between the parts is known.

  This known viscous material pump has, inter alia, an inflow opening formed as a curved slot and a closing projection of both pipe switching parts during the pipe switching part switching or swinging process. It is characterized, at least temporarily, to ensure that a short circuit connection of both conveying cylinders is provided. Through these measures, during the switching process of the pipe switching unit, both of the transfer cylinders can be temporarily disconnected from the inside of the hopper, and can be short-circuited to each other while jointly connected to the transfer line. Thus, it is possible for one of the transport pistons to start its transport stroke, while at the same time doing so until one transport piston still finishes its transport stroke. Only when the short-circuit connection between both merging openings is terminated again and when the attached transport cylinder is connected to the inside of the hopper, the transport piston that has finished the transport stroke does not have its subsequent filling stroke Run. In order to function safely, the pipe switching part is securely sealed (sealed) with respect to the hopper wall part in the area of the merging opening part during the conveyance driving and also during the switching driving. Is necessary. Known viscous pumps of the kind mentioned at the outset are not sufficient in terms of sealing technology.

DE 195 03 986 A1

  As a result, the present invention guarantees a sufficient seal in the range between the pipe switching part and the hopper wall part in the state where the pipe switching part is stationary or moving in the same manner. Thus, it is based on the problem of improving a known viscous material pump of the kind mentioned at the beginning.

  In order to solve this problem, a combination of features as claimed in claim 1 is proposed. Advantageous configurations and developments of the invention result from the dependent claims.

  The solution according to the invention is basically based on the following characteristics: a pipe switching part is made of a metal ring element (ring member) having an arc-shaped elongated hole, and on the delivery line on the discharge side. A cushion member disposed between the connected oscillating tube and the ring element, the cushion member having an opening surrounding the elongated hole, and the ring element being It is possible to move in a limited axial direction relative to the oscillating pipe, and the ring element can move inside the hopper wall through the cushion member under the action of the conveying pressure in the pipe switching section. It can be pressed against the side. The measures according to the invention achieve that the sealing action (sealing action) remains maintained not only when the pipe switching part is stationary at the end position but also when the pipe switching part is rotating. Is done. As a result, the pipe switching unit is reliably sealed against the inside of the hopper in all switching states or driving states. This also applies to the area of the closing projection, since the cushion member extends into this area and also provides a sealing action from the inside of the pipe. In so doing, it is taken into account that the closing projection allows precompression of the viscous material during the switching process for starting the transport stroke. In accordance with the present invention, the cushion member has a non-circular and flat cross-sectional shape. In particular, a material having rubber elasticity is substantially incompressible like a liquid that uniformly transmits hydraulic pressure (hydraulic pressure) in all directions. This means that the pressure of the carrier substance is ideally transmitted from the inside of the pipe switching part through the cushion member, and particularly to the closing protrusion part. Thereby, the metal ring element is pressed against the inner surface of the hopper wall, although only the inflow contour of the cushion member is in contact with the medium that conducts pressure. A further improvement in this respect is achieved by providing a kind of fluid pocket or gel pocket inside the cushion member through which pressure can be better transmitted.

  According to a further advantageous configuration of the invention, the hopper wall has a replaceable closing plate with a passage opening on its inner surface directed towards the ring element. This closing plate can be replaced relatively easily when worn. Furthermore, in this regard, materials with higher wear resistance to the hopper and therefore more expensive materials may be used.

  According to another advantageous configuration of the invention, the ring element has a pocket for receiving the cushion member, which is arranged on the side of the oscillating tube and extends over its outer contour to the cushion member. It is intended to be adapted and molded in steps. A further improvement in this respect is achieved when the ring element is defined by a stepped pocket wall towards the slot and its height is lower than the outer pocket edge. With this measure, even when the cushion member is more securely fitted between the swing pipe and the ring element, and even when a suction pressure such as that generated in a water washing process is generated, the cushion member remains in its pocket. It is achieved that it is not extracted from the part.

  A further improvement in the positioning of the ring element in the oscillating tube is that an end portion on the cylinder side of the oscillating tube is defined in an arc shape and is provided with a protrusion penetrating through the oscillating tube channel, This is achieved by having an outer contour corresponding to the pocket of the ring element.

  In the following, the present invention will be explained in more detail with the aid of the embodiment schematically shown in the drawings.

A schematic diagram of a two-cylinder viscous material pump is shown. The principle figure of the basic part of the pump for viscous substances is shown with a schematic exploded view. Fig. 3 shows a schematic exploded view of a pipe switching part with a closing plate. Fig. 3b shows a schematic exploded view of a pipe switching part with a closing plate, viewed from a side different from Fig. 3a. A pipe switching part with a closing plate is shown in a drawing corresponding to FIG. 3a with the pipe switching part assembled. FIG. 4a shows a drawing corresponding to FIG. Embodiment of a ring element provided with a cushion member is shown with the front view seen from the reverse side. 1 shows in cross section an embodiment of a ring element comprising a cushion member. 1 shows an embodiment of a ring element comprising a cushion member in a schematic exploded view from the opposite side.

  The viscous substance pump shown in FIG. 1 has a hopper (material supply container) 10 for containing a viscous substance such as liquid concrete. The liquid concrete is conveyed through the pipe elbow 12 to the only suggested conveyance line (discharge pipe) 14. This is performed using two transfer cylinders 16 and 17, which are respectively connected to end openings 18 and 19 at the end side, and through-holes 18 ′ and 19 of the hopper wall 20. And the transfer pistons 22 and 23 alternately perform a filling stroke and a transfer stroke. Inside the hopper 10, there is a pipe switching unit 24, and the transfer cylinders 16 and 17 can be alternately connected to the hopper inside 21 and the discharge pipe 14 via the pipe switching unit 24. In this case, the pipe switching section 24 can swing to its desired position with respect to the merging openings 18 and 19 each time via a hydraulic drive mechanism. The transfer pistons 22 and 23 are driven by using hydraulic cylinder-piston units 26 and 27. Of the cylinder-piston units 26 and 27, only the cylinder is schematically suggested in FIG. As will be described in more detail below, the pipe switching portion 24 has an inflow opening formed as an elongated hole 28 pointing in the direction of the confluence openings 18 and 19 and curved in an arc shape, The width corresponds to the diameter of the merging openings 18 and 19, and the length corresponds to the outer space (outer end space) of the merging openings 18 and 19. In addition, the inflow opening has closing protrusions 30 and 31 that extend beyond the inflow opening 28 in the swinging direction, and the extending portion is substantially at the interval between the two confluence openings 18 and 19. It corresponds.

  In the present invention, a special point is that the pipe switching portion 24 is formed between a metal ring element 32 having an arc-shaped elongated hole 28, and an oscillating pipe 34 connected to the conveying line on the discharge side. A cushion member 36 disposed on the surface. The cushion member 36 has an elongated hole-shaped opening 38 surrounding the elongated hole 28 in the ring element 32. At this time, the ring element 32 is movable in the axial direction relative to the rocking tube 34, and the cushion member 36 under the action of the transport pressure generated in the pipe switching portion 34 during the transport stroke. It is possible to press against the inner side surface of the hopper wall portion 20 via. The hopper wall 20 has a replaceable metal closing plate 20 ′ on its inner surface facing the ring element 32, which is used for the passage openings 18 ′, 19 ′ and the bearing bolt 42. The bearing bore 40 is provided.

  As can be seen in FIGS. 5a to 5c, the ring element 32 accommodates the cushion member 36 which is arranged on the side of the oscillating tube and is stepped to fit the cushion member 36 over its outer contour. A pocket portion 44 is provided. In this embodiment, the ring element 32 is also defined by the stepped inner pocket wall 46 toward the slot 28 and its height is lower than the outer pocket edge 48. At the cylinder side end of the oscillating tube 34, there is a protruding portion 50 defined in an arc shape, and the protruding portion 50 is penetrated by the oscillating tube channel 52 (FIG. 3a). It has an outer contour that fits into the pocket 44 in the ring element 32 (FIG. 3b). By these measures, the axial guide of the ring element 32 on the rocking tube 34 is improved and stabilized.

  In order to ensure reliable pressure transmission, the cushion member 36 is made of a flexible material, a material having elasticity, or a material having rubber elasticity. A further improvement in the fit effect can be achieved by the cushion member 36 including a filling formed as an incompressible liquid.

  The inflow opening of the pipe switching part or of the ring element is short-circuited inside the long hole 28 via the merged openings 18 and 19 by both the conveying cylinders 16 and 17 together with the curved long hole shape. Configured to be connected. If both transport cylinders 16, 17 perform transport strokes with their transport pistons 22, 23 at this position, a smooth and shock-free switching process can be ensured. In order to prepare for the switching process, pressure may be applied during the crossing movement of the closing projections 30, 31 at the pipe switching part 24 into the previously filled transport cylinder. Thereby, a further improvement is brought about with regard to the continuous flow through the transfer line even during the switching process. On the other hand, this means that the piston speed is different and therefore the stroke duration is different between the filling stroke and the conveying stroke, but it is in accordance with the functional features described. The reason is that the time available for the filling stroke is less than the time available for the transport stroke.

  In summary, the following is confirmed. The present invention uses the hopper (material supply container) 10 and the two transfer cylinders 16 connected to the passage openings 18 ′ and 19 ′ of the hopper wall 20 using the merging openings 18 and 19 on the end side, respectively. , 17, and a viscous substance pump. The transfer cylinders 16 and 17 are arranged so that the transfer pistons 22 and 23 alternately perform the filling stroke and the transfer stroke, and the hopper interior 21 and the discharge pipe are alternately switched by the pipe switching unit 24 disposed inside the hopper 10. 14 can be connected. The pipe switching unit 24 has an inflow opening formed as a long hole 28 that is curved in an arc shape indicating the direction of the two confluence openings 18 and 19, and the width thereof is the same as that of the confluence openings 18 and 19. It corresponds to the diameter and its length corresponds to the outer spacing of the merging openings 18, 19. The elongated hole has closing protrusions 30 and 31 that extend beyond the inflow opening in the swinging direction, and the extending portion corresponds to the interval between the two merged openings 18 and 19. Yes. In order to ensure a reliable sealing of the separation point between the pipe switching part 24 and the hopper wall part 20, according to the present invention, the pipe switching part 24 is made of a metal ring element 32 having an arc-shaped slot 28, And a cushion member 36 disposed between the swing pipe 34 and the ring element 32 connected to the discharge-side transport line 14, and the cushion member 36 is an opening surrounding the elongated hole 28. The cushion member 36 is provided under the action of the conveying pressure in the pipe switching portion 24, and the ring element 32 is movable in the axial direction relative to the swing pipe 34. It is proposed that it can be pressed against the inner surface of the hopper wall 20.

10 Hopper (material supply container)
12 Piping elbow 14 Conveyance line (discharge pipe)
16, 17 Conveying cylinder 18, 19 Merge opening 18 ', 19' Passing port 20 Hopper wall 20 'Closing plate (slip plate)
21 Inside of hopper 22, 23 Conveying piston 24 Pipe switching part 26, 27 Cylinder-piston unit 28 Elongate hole 30, 31 Protrusion part for closing 32 Ring element (ring member)
34 Oscillating pipe 36 Cushion member 38 Opening 40 Bearing bore 42 Bearing bolt 44 Pocket part 46 Pocket wall part 48 Pocket edge part 50 Protruding part 52 Oscillating pipe flow path

Claims (8)

Two transport cylinders (16, 17) connected to the passage openings (18 ', 19') of the hopper wall part using the hopper (10) and the merging openings (18, 19) on the end side, respectively. A viscous material pump having
The transfer cylinders (16, 17) can be alternately connected to the inside of the hopper (21) and the transfer line (14) by a pipe switching section (24) disposed in the hopper (10). These transfer pistons (22, 23) alternately perform a filling stroke and a transfer stroke, and at that time, the pipe switching part (24) is formed as a long hole (28) curved in an arc shape, and the merge opening Inflow opening part which shows the direction of a part (18, 19) has the width | variety corresponding to the diameter of the said passage opening (18 ', 19'), and the length is said passage opening (18 ') 19 ′), and the inflow openings have closing protrusions (30, 31) extending beyond the outer ends of the elongated holes (28) in the swinging direction, respectively. The viscous material pump Te,
The pipe switching portion (24) is connected to the metal ring element (32) having the arc-shaped elongated hole (28), and the ring element (32) and the discharge line on the discharge line (14). A cushion member (36) disposed between the swing pipes (34), and the cushion member (36) has an opening (38) surrounding the elongated hole (28). In this case, the ring element (32) is movable in the axial direction relative to the swing pipe (34), and the conveyance pressure in the pipe switching portion (24) is reduced. Under action, it can be pressed against the inner surface of the hopper wall (20) via the cushion member (36);
A viscous material pump. The viscous material pump according to claim 1,
The hopper wall (20) has a replaceable closing plate (20 ′) with a passage opening (18 ′, 19 ′) on its inner surface facing the ring element (32);
A viscous material pump. The viscous material pump according to claim 1 or 2,
The ring element (32) is a pocket portion (44) for accommodating the cushion member (36), and is disposed on the rocking tube side, and extends to the cushion member (36) over its outer contour. Having a pocket (44) adapted and stepped to form an outer pocket edge (48);
A viscous material pump. The viscous substance pump according to claim 3,
The ring element (32) is also defined by the stepped inner pocket wall (46) relative to the slot (28), the height of which is greater than the outer pocket edge (48). Is too low,
A viscous material pump. The viscous substance pump according to claim 3 or 4,
A protruding portion (50) that is defined in an arc shape and is penetrated by the swinging tube channel (52) is disposed at an end of the swinging tube (34) on the cylinder side. ) Has an outer contour corresponding to the pocket (44) of the ring element (32);
A viscous material pump. The viscous substance pump according to any one of claims 1 to 5,
The cushion member (36) is made of a flexible material or a material having elasticity;
A viscous material pump. The viscous material pump according to any one of claims 1 to 6,
The cushion member (36) is at least partially made of a material having rubber elasticity;
A viscous material pump. In the pump for viscous substances according to any one of claims 1 to 7,
The cushion member (36) includes a filling portion formed as an incompressible liquid;
A viscous material pump.

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