WO2016030269A1

WO2016030269A1 - Automotive concrete pump with a supporting construction

Info

Publication number: WO2016030269A1
Application number: PCT/EP2015/069136
Authority: WO
Inventors: Knut Kasten
Original assignee: Putzmeister Engineering Gmbh
Priority date: 2014-08-28
Filing date: 2015-08-20
Publication date: 2016-03-03
Also published as: DE102014217117A1

Abstract

The invention relates to an automotive concrete pump with a chassis (10), with a concrete-distributing boom (15) which is arranged on a chassis-mounted rotary unit (14) so as to be rotatable about a vertical axis of rotation, with a core pump (16) which is arranged on the chassis (10) and which is connected on the delivery side to a concrete-conveying line guided via the concrete-distributing boom (15), and with a supporting construction (18). The supporting construction (18) has, on each side of the chassis (10), a respective first and a second supporting arm (20, 22) which can be pivoted about a vertical pivot axis under the action of a respective hydraulic setting-out mechanism between a transport position in which they are folded in with respect to the chassis (10) and at least two supporting positions in which they are folded out relative to the chassis (10). A particular feature of the invention consists in the fact that at least one of the hydraulic setting-out mechanisms is formed as a pivoting cylinder pair (36, 37) with two differential cylinders (52, 54) rigidly connected to one another on the ground side. Here, the differential cylinders (52, 54) of the pivoting cylinder pair (36, 37) expediently have piston rods (56, 58) which are aligned with one another and project on opposite sides beyond the associated cylinder.

Description

Truck-mounted concrete pump with support structure Description

The invention relates to a truck-mounted concrete pump having a chassis which has at least one front axle and at least one rear axle, with a distributor mast rotatably mounted on a chassis-fixed slewing gear about a vertical axis of rotation, with a core pump arranged on the chassis, on the pressure side connected to a concrete conveying line guided via the distributor mast and with a support structure having on each side of the chassis each a first and a second, about a vertical pivot axis under the action of a hydraulic Ausstellmechanismus between a folded against the chassis transport position and at least two relatively unfolded to the chassis support positions pivotable support arm.

In mobile concrete pumps, it is known to provide laterally swingable on a chassis and telescopic support boom for supporting the concrete pump in working position (DE 100 32 622 A1). The substructure of these known concrete pumps has two front and two rear support arms, which are hinged to fixed chassis swivel bearings and can be unfolded by means of a hydraulic cylinder. The front support arms are directed forward and telescoping bar to be accommodated in a confined space between the mast and a cab of the chassis on the one hand and on the other hand to achieve the necessary boom for the support boom length. For the safety of the operator and to avoid a collision with machine parts, it is expedient if the support arms are extended in stages with a defined intermediate stop and retracted again. This stopover is also used for a narrow support. In order to be able to precisely set the intermediate stop, it is necessary with continuously extendable differential cylinders by a distance measurement between the cylinder and the piston rod and a control technology implementation of this displacement measurement in the desired extension length of the piston rod. Here are technical complications that are considered disadvantageous.

Proceeding from this, the present invention seeks to improve the known truck-mounted concrete pump with support structure of the type specified in that a simple extension of the support arm in a predetermined intermediate position is possible.

To solve this problem, the feature combination specified in claim 1 is proposed. Advantageous embodiments and modifications of the invention will become apparent from the dependent claims.

The solution according to the invention is based primarily on the idea that, when using a swivel cylinder pair as a deployment mechanism for the support arms, a precisely defined step-by-step extension of the deployment mechanism is possible. To achieve this, it is proposed according to the invention that at least one of the hydraulic Ausstellmechanismen is formed as a pair of pivot cylinders with two bottom side rigidly interconnected Differenzialzyl by. Differential cylinders are double-acting cylinders with one piston rod each. In the swivel cylinder pair according to the invention, the piston rods are on opposite sides of the associated cylinder and aligned with each other. The stepwise extension of the support legs is advantageously carried out in that each one of the differential cylinder of the swing cylinder pair is fully moved from its retracted to its pushed-end position and that the extension of the second Differenzialzyl inder is released only in the extended state of the first differential cylinder. With this measure, different deployment angle of the support arm can be adjusted. If, in addition to this, the stroke lengths of the differential cylinders of a pair of swivel cylinders are different, two different can be chosen in addition to the retracted end position approach wide narrow supports and a full support with the support arms. In addition, with the stroke of one of the differential cylinder and another function, for. B. the extension of the differential cylinder of another support arm are triggered. Due to different geometric proportions of the differential cylinder of a pair of swivel cylinders and different speeds or gear ratios can be set during the extension and retraction. Therefore, it may be advantageous if the pistons of the differential cylinders have different piston diameters.

According to a first embodiment of the invention, the piston rod of the first differential cylinder of a pair of swivel cylinders at a chassis fixed bearing and the second differential cylinder is articulated to a support arm fixed bearing, in which case the

Support arm is hinged to a chassis-fixed pivot bearing.

Basically, it is also possible according to a second embodiment of the invention that the piston rod of the first differential cylinder of a pair of swivel cylinders of the first support arm is articulated to a support arm fixed bearing of the adjacent second support arm and the piston rod of the second differential cylinder to a support arm fixed bearing of the first support arm, said in this Case of the first support arm is hinged to a pivot bearing of the second support arm.

Furthermore, it is advantageous if at least the first two support arms arranged in the vicinity of the fore axis are pivotable relative to the chassis via a respective pair of pivot cylinders made of two differential cylinders. This applies to the case where the support arm arranged at the proximal axis with the piston rod of its one differential cylinder are articulated either to a chassis-fixed bearing point or to a support armature-fixed bearing point of the adjacent second support arm. It is particularly advantageous, however, if all four support arms are pivotable relative to the chassis via a respective pair of swivel cylinders.

A further advantageous embodiment of the invention provides that the first and / or the second support arm have a relative to the chassis pivotable about the pivot axis extension box and at least one relative to the extension box by means of a third differential cylinder displaceable telescope part.

Another special feature of the invention is that the two Differenziaizylinder of each pair of swivel cylinders by means of a respective hydraulic control device or preferably designed as a directional valve reversing valve are independently pressurized in both directions to the respective piston stopper with pressure. With this measure, it is possible that one of the two Differenziaizylinder a pair of swivel cylinders and the third Differenziaizylinder an associated telescopic support arm in the manner of a sequential control are controlled sequentially. This can ensure that the telescoping support arm is initially pivoted from its transport position into an intermediate position before the telescopic part which can be actuated via the third differential cylinder can be extended. This avoids a collision of the telescopic part with a machine part, for example with the cab, the truck-mounted concrete pump. The sequence control expediently comprises a directional control valve and an overflow valve with a backflow release valve assigned to the respective differential cylinder and adjusted to a predetermined pressure. On the other hand, in this case, the other of the two Differenziaizylinder the Schwenkzylinderpaars be controlled independently of the first Differenziaizylinder in both directions of pivoting. In this way, different intermediate positions of the support arm can be approached at different stroke lengths of the two Differenziaizylinder a Schwenkzylinderpaars. In the following, the invention is explained in more detail with reference to the exemplary embodiments shown schematically in the drawing. Show it

Fig. 1 a is a side view of a truck-mounted concrete pump with support arms in transport position;

Fig. 1 b is a plan view of the truck-mounted concrete pump according to Fig. 1 a with

Support arms in different positions;

2a, b and c are each a schematic of a truck-mounted concrete pump with front and rear support arms and pairs of pivot cylinders in the transport position and in positions of the narrow support and the full support;

3 shows a first circuit variant for the actuation of the differential cylinder of the front telescopic support arm of a truck-mounted concrete pump;

4 shows a second circuit variant for the actuation of the differential cylinder of the front telescopic support arm of a truck-mounted concrete pump;

Fig. 5 shows a third circuit variant for the swivel cylinder pair of the front or rear support arm of a truck-mounted concrete pump.

The truck-mounted concrete pump shown in the drawing essentially consists of a multiaxial chassis 10, which in the embodiment shown (FIG. 1) has two front axles 11 and three rear axles 12, with a cab 13, with one at a near-axle turning mechanism 14 about a vertical one Axis rotatably mounted concrete distributor mast 15, with a mounted at a distance from the slewing gear 14 on the chassis 10 The support structure 18 is located on a chassis-fixed substructure 19 and comprises two front support arms 20 and two rearward

Support arm 22. The support arms 20, 22 are folded in their transport position and aligned parallel to the vehicle longitudinal axis 24. In the different support positions they are obliquely forward or backward over the chassis 10 and are supported with their foot parts 26, 28 on the substrate 30.

The front support arms 20 are in pivot bearings 32 and the rear support arms 22 in pivot bearings 34 each with vertical pivot axes between the transport position (Fig. 2a), an intermediate position for the narrow support (Fig. 2b) and an end position for the full support (Fig. 2c). pivoted under the action of each one Ausstellmechanismus. In addition, in the embodiments shown, the front support arms 20 are formed as a telescopic boom. The front support brackets 20 each comprise a pivotable in 32 pivot bearing relative to the chassis 10 Ausschubkasten 38 and one of three (Fig. 1 a and b) or two (Fig. 2a to 2c) telescopic elements 40 ', 40 ", 40"' existing telescope part 40. Extending through the extension box 38 and the telescoping parts is a double-acting differential cylinder 42 which is hinged at one end to an attachment point 44 of the extension box 38 and at its other end to an attachment point 50 of the telescopic element 40 'and 40 "respectively Attachment 44 is located at the rear end of the Ausschubkastens 38, while the attachment point 50 is at the front end of the last telescopic element 40 "'or 40", so that the differential cylinder 42 both in the extended position and in the retracted end position completely within of the support arm 20 is arranged.

A special feature of the first embodiment variant shown in FIGS. 2a to 2c is that the hydraulic Ausstellmechanismen the predecessor Ren and rear support arm 22 as Schwenkzylinderpaare 36 with two bottom side rigidly interconnected Differenzialzyl by 52, 54 is formed, wherein the piston rods 56, 58 of the Differenzialzyl indians 52, 54 of each pair of pivot cylinders 36 are aligned and projecting to opposite sides on the associated cylinder. In this case, the piston rod 56 of the respective first Differenziaizylinders 52 a

Schwenkzylinderpaars 36, 37 hinged to a chassis fixed bearing point 60, while the piston rod 58 of each second Differenziaizylinders 54 is hinged to a support arm fixed bearing 62, wherein the support arms 20, 22 in turn are hinged to a chassis fixed pivot bearing 32, 34.

In a comparison with Fig. 2a to 2c modified, not shown in the drawing second embodiment, it is in principle also possible that the piston rod 56 of the first Differenziaizylinders 52 a

Schwenkzylinderpaars 36 of a first support arm 20 is hinged to a support arm fixed bearing point of the adjacent second support arm 22, while the piston rod 58 of the second Differenziaizylinders 54 of the respective Schwenkzylinderpaars 37 is hinged to a support arm fixed bearing point of the first support arm 20, 22, wherein the first

Support arm 20 is hinged to a pivot bearing of the second support arm 22. In this case, the second support arm 22 is expediently designed as a rearward and the first support arm 20 as a front support arm.

As can be seen from Figs. 3 to 5, the Differenzialzyl indians 52, 54 of each pair of pivot cylinders 36 by means of a respective hydraulic control device 64 and / or at least one directional valve 64 ', 64 ", 64"', 66, 68, 70 , 72 independently of each other in both directions up to the respective piston stop via one of the hydraulic pumps 74 ¹ to 74 ^v 'are pressurized The stroke length of the piston rods 56, 58 in the two differential cylinders 52, 54 of each pair of pivoting cylinders 36, 37 The dimensioned so that both a narrow support according to FIG. 2b and a full support according to FIG. 2c is possible. Depending on which of the two differential cylinders 52, 54 is first extended, different intermediate positions of the support arms 20, 22 can be approached, so that in addition to the retracted transport position in the various piston stops a total of three support positions are adjustable.

Next can be triggered by simple means sequential controls on the hydraulic control device, which improve the reliability of the support structure 18. It is z. B. to take into account that in the retracted transport position designed as a telescopic cylinder differential cylinder 42 may not be actuated in the front support arms 20 when the relevant support arm 20 is not disposed in one of its Ausstellpositionen shown in FIG. 2b, c. This measure prevents the telescopic part 40 against a machine part, such as the cab 13, strikes. When retracting the front support arm 20, the telescopic part 40 is initially drawn into the extension box 38 via a suitable circuit arrangement, before the support arm 20 shortened in this way can be pivoted into its transport position. Since the rear support arms 22 are not telescopic, they can be pivoted independently of the front support arms 20 from the transport position in the various Ausstellpositionen or be swung back from these into the transport position.

Various variants of a hydraulic control are shown schematically in FIGS. 3 to 5.

The first circuit variant according to FIG. 3 relates to a sequential control of the two differential cylinders 52, 54 of a pair of swivel cylinders 36 and of the differential cylinder 42 located in the telescoping support arm 20, preferably designed as a telescopic cylinder. The control of the first Differenziaizylinders 52 in the swivel cylinder pair 36 and the Differenziaizylinders 42 in the telescopic part 40 is carried out together via the directional control valve 66 in one and in the other direction. The first Differenziaizylinder 52 is to extend to the bottom side 52 'via the left outlet 76' of the directional control valve 66 by means of a hydraulic pump 74 ^{1 can be} pressurized, while the rod side 52 "of the first Differenziaizylinders 52 is connected via a check valve 78 to the tank 74. About the extension distance of the first Differenziaizylinders 52 of Differenziaizylinder 42 of the telescopic part 40 by the spill valve 80, which is set to the spring 82 to a certain form, locked until the piston 56 'of the first differential valve 52 reaches the rod-side piston stopper 85 "and in the line 84 an operating pressure builds up, which enables the fluid passage to Differenziaizylinder 42. In this state, the Differenziaizylinder 42 and the telescopic part 40 is extended until there the rod-side piston stopper 86 'is reached. In the opposite direction, first of all the differential cylinder 42 of the telescopic part 40 is actuated via the right-hand output 76 "of the directional control valve 66. At the same time, the return line of the differential cylinder 42 is released via the check valve 79 to the tank 74. As soon as the piston 42 'of the differential cylinder 42 reaches the bottom-side piston stop 86 ", an operating pressure builds up via the second overflow valve 88, which displaces the piston 56 'in the first differential cylinder 52 from the rod side 52" into its retracted end position Line 84 displaced into the tank 74.

The second differential cylinder 54 of the swivel cylinder pair 36 can be pressurized independently of the first differential cylinder 52 via a second directional control valve 68 either in the extension direction or in the retraction direction, depending on its feedforward control via the hydraulic pump 74 "This means that the second differential cylinder 54 is independent of the other two Differential cylinders 52, 42 can be moved second Differenziaizylinder 54 of the swing cylinder pair 36 first fully off before the Differenziaizylinder 42 of the telescopic part 40 can extend. Conversely, the Differenziaizylinder 42 of the telescopic part 40 initially moves completely before the second Differenziaizylinder 54 of the swing cylinder pair 36 can retract again.

In this case, a control device 64 shown as a black box is provided, in which the sequence control is evaluated via one end position signal 89, 90 on the first differential cylinder 52 of the swivel cylinder pair 36 and on the differential cylinder 42 of the telescope part 40 in order to trigger the following movement of these two differential cylinders 52, 42 in the retraction direction and in the extension direction via selected electrical pilot inputs 92 of the two directional control valves 64 ', 64 " 52, 42. The first differential cylinder 52 of the swivel cylinder pair 36 can only travel when the differential cylinder 42 of the telescope part 40 has moved in. Conversely, the differential cylinder 42 of the telescope part 40 can only travel when the first differential cylinder 52 of the swivel cylinder couple 36 is extended.

In the third circuit variant according to FIG. 5, which applies, for example, to the rearward support arms 22, it can be seen that the two differential cylinders 52, 54 of the pivoting cylinder pair 37 can be controlled independently of one another via the directional control valves 70, 72. With the first Differenziaizylinder 52, a first intermediate position can be approached in the same time a narrow support is possible (Fig. 2b). When the first differential cylinder 52 is retracted, a second intermediate position (not shown) can be approached with the second differential cylinder 54, which differs from the first intermediate position because of the different piston stroke. The maximum position, which also gives full support, is achieved when the first differential cylinder 52 is extended second differential cylinder 54 of the swing cylinder pair 37 is extended (Fig. 2c).

The invention relates to a truck-mounted concrete pump with a chassis 10, with a fixed to a chassis fixed slewing gear 14 rotatable about a vertical axis of rotation concrete placing boom 15, arranged on the chassis 10, the pressure side of a guided over the concrete placing boom 15 concrete conveying line The support structure 18 has on each side of the chassis 10 each have a first and a second, about a vertical pivot axis under the action of a hydraulic Ausstellmechanismus between a folded against the chassis 10 transport position and at least two relative to Chassis 10 unfolded support positions pivotable support bracket 20, 22 on. A special feature of the invention is that at least one of the hydraulic Ausstellmechanismen than

Swivel cylinder pair 36, 37 with two bottom side rigidly interconnected Differenziaizylindern 52, 54 is formed. In this case, the differential cylinders 52, 54 of the swivel cylinder pair 36, 37 expediently aligned with each other, on opposite sides on the associated cylinder projecting piston rods 56, 58 on.

LIST OF REFERENCES

chassis

front axles

rear axles

cabin

slewing

Concrete placing boom

Kempumpe

support structure

substructure

first, front outriggers second, backward outriggers

vehicle longitudinal axis

footboards

underground

pivot bearing

Tilt cylinder pair

out box

telescopic part

', 40 ", 40"' telescope element

Differential cylinder of the telescopic part 'piston

fastening point

first differential cylinder

'Bottom side

"Rod side

second differential cylinder piston rod

' Piston

piston rod

chassis-fixed bearing support bracket fixed bearing point

control device

', 64 ", 64"' way valve

, 68 way valve

, 72 way valve

tank

'to 74 ^v ' hydraulic pump

'left output

"right exit,

, 79 Check valve

overflow

feather

management

"Piston stop

', 86 "piston stop

second overflow valve

End position signal

Final position signal electrical pilot inputs

Claims

claims

1 . Truck-mounted concrete pump with a chassis (10) having at least one front axle (11) and at least one rear axle (12) with a concrete distributor boom (15) rotatably mounted about a vertical axis of rotation on a chassis-fixed slewing gear (14), with one on the chassis (10) arranged on the pressure side to a concrete distributor boom (15) guided concrete delivery line connected core pump (16) and with a support structure (18) on each side of the chassis (10) each have a first and a second, to a vertical pivot axis the action of each of a hydraulic Ausstellmechanismus between a against the chassis (10) folded transport position and at least two relative to the chassis (10) unfolded support positions pivotable support arm (20, 22), characterized in that at least one of the hydraulic Ausstellmechanismen as Schwenkzylinderpaar (36, 37) with two bottom side rigidly connected Differential cylinders (52, 54) is formed.

2. truck-mounted concrete pump according to claim 1, characterized in that the Differenziaizylinder (52, 54) of each pair of pivot cylinders (36) aligned with each other, to opposite sides on the associated cylinder projecting piston rods (56, 58).

3. truck-mounted concrete pump according to claim 2, characterized in that the piston rod (56) of the first differential cylinder (52) of the

Schwenkzylinderpaars (36, 37) of a support arm (20, 22) to a chassis fixed bearing (60) and that of the second differential cylinder (54) to a support arm fixed bearing (62) is articulated, wherein the support arm (20, 22) on a chassis-fixed pivot bearing (32, 34) is articulated.

4. truck-mounted concrete pump according to claim 2, characterized in that the piston rod (56) of the first differential cylinder (52) of a Schwenkzylinderpaars (36) of the first support arm (20) on a support arm fixed bearing point of the adjacent second support arm (22) and the second differential cylinder ( 54) is hinged to a support arm fixed bearing point of the first support arm (20), wherein the first support arm (20) is articulated to a pivot bearing of the second support arm (22).

5. truck-mounted concrete pump according to one of claims 1 to 4, characterized in that at least the two first, close to the front axle arranged support arm (20) via a respective pair of swivel cylinders (36) of two Differenzialzyl by (52, 54) relative to the chassis (10) are pivotable ,

6. truck-mounted concrete pump according to one of claims 1 to 5, characterized in that all four support arms (20, 22) via a respective pair of swivel cylinders (36, 37) relative to the chassis (10) are pivotable.

7. truck-mounted concrete pump according to one of claims 1 to 6, characterized in that the first and / or the second support arm (20) relative to the chassis (10) pivotable about the pivot axis Ausschubkasten (38) and at least one relative to the Ausschubkasten (38) Having a third differential cylinder (42) displaceable telescope part (40).

8. truck-mounted concrete pump according to one of claims 1 to 7, characterized in that the two Differenzialzyl indians (52, 54) of each pair of swivel cylinders (36, 37) by means of a hydraulic control device (64) or a directional control valve (66, 68, 64 ' , 64 ", 64"') can be pressurized independently of one another in both directions up to the respective piston stop.

9. truck-mounted concrete pump according to one of claims 1 to 7, characterized in that one of the two Differenziaizylinder (52, 54) of a Schwenkzylinderpaars (36) and the third Differenziaizylinder (42) of an associated telescopic support arm (20) in its extension or in its retraction are controllable in the manner of a sequential control.

10. truck-mounted concrete pump according to claim 9, characterized in that the sequence control comprises at least one directional control valve (66) and at least one respective Differenziaizylinder (52, 54) associated, responsive to a predetermined operating pressure relief valve (80, 88) with backflushing.

1 1. Truck-mounted concrete pump according to claim 9 or 10, characterized in that the other of the two Differenziaizylinder (54) of the Schwenkzylinderpaars (36) independently of the first Differenziaizylinder (52) of the Schwenkzylinderpaars (36) in both pivot directions is controlled.

12. truck-mounted concrete pump according to one of claims 1 to 1 1, characterized in that the pistons of the two Differenziaizylinder (52, 54) of the swivel cylinder pair (36) have different stroke lengths.

13. Truck-mounted concrete pump according to one of claims 1 to 12, characterized in that the pistons of the two Differenziaizylinder (52, 54) of the swivel cylinder pair (36) have different sized piston diameter.