Method for operating a construction-material and / or thick-matter pump device, and construction-material and / or thick-matter pump device

Abstract

The invention relates to a method for operating a construction-material and / or thick-matter pump device (1) which has two variable-volume delivery chambers (F1, F2) which are each delimited by means of a delivery cylinder (Z1, Z2) and by means of a delivery piston (K1, K2), and a drive hydraulic system (2) for driving the delivery pistons (K1, K2) in an adjusting manner, wherein the drive hydraulic system (2) has a valve device (4) for adapting a swing volume (3) of hydraulic fluid (H) which hydraulically couples the delivery pistons (K1, K2) in terms of movement; the method comprising the steps of: a) executing opposite stroke movements (M1, M2), b) monitoring current piston positions (P1, P2) in order to determine a starting value (W) of a stroke asynchrony (A) of the opposite stroke movements (M1, M2) on the basis of the piston positions (P1, P2), c) discharging hydraulic fluid (H) by means of the valve device (4) such that the swing volume (3) is reduced and the stroke asynchrony (A) relative to the starting value (W) is changed, and d) feeding in hydraulic fluid (H) by means of the valve device (4) such that the swing volume (3) is increased again and the stroke asynchrony (A) is set to the starting value (W) again.

Description

[0001] Method for operating a construction and / or thick-sludge pumping system as well as construction and / or thick-sludge pumping system

[0002] SCOPE OF APPLICATION AND STATE OF THE ART

[0003] The invention relates to a method for operating a construction and / or viscous material pumping device, which is designed for conveying construction and / or viscous materials. The invention also relates to such a construction and / or viscous material pumping device for conveying construction and / or viscous materials.

[0004] TASK AND SOLUTION

[0005] It is an object of the present invention to provide a method for operating a construction and / or viscous material pumping device for conveying construction and / or viscous material, as well as such a construction and / or viscous material pumping device for conveying construction and / or viscous material, which, in particular, each exhibit improved properties. In particular, the exchange of hydraulic fluid within a variable volume of the construction and / or viscous material pumping device is to be improved during its operation.

[0006] This problem is solved by the subject matter of the independent patent claims. Preferred embodiments are the subject matter of the dependent patent claims.

[0007] A method according to the invention serves to operate a construction and / or viscous material pumping device. In particular, the construction and / or viscous material pumping device is operated during the execution of the method. The construction and / or viscous material pumping device is designed for conveying construction and / or viscous material. In particular, the construction and / or viscous material pumping device conveys construction and / or viscous material when it is operated according to the method. The construction and / or viscous material pumping device has two conveying chambers with variable volumes. The conveying chambers are each delimited by a conveying cylinder of the construction and / or viscous material pumping device and by a conveying piston of the construction and / or viscous material pumping device that is adjustable within the respective conveying cylinder.The construction and / or viscous material pumping device thus comprises two delivery cylinders and two delivery pistons, with one of the delivery pistons in each delivery cylinder being adjustable and with each delivery cylinder, together with the adjustable delivery piston within it, defining the volume of one of the two delivery chambers. The construction and / or viscous material pumping device also features a drive hydraulic system for the adjustable actuation of the delivery pistons relative to the delivery cylinders, and this drive hydraulic system is permeable to hydraulic fluid. The drive hydraulic system includes a controllable valve assembly designed to adjust a hydraulic fluid oscillation volume that hydraulically couples the movement of the delivery pistons. In particular, the two delivery pistons of the construction and / or viscous material pumping device are thus coupled to each other by means of this hydraulic fluid oscillation volume.The volume of hydraulic fluid being oscillated can be reduced and / or kept constant and / or increased by means of the controllable valve device of the drive hydraulic system.

[0008] The inventive method for operating the construction and / or high-viscosity pumping device comprises a step a) in which opposing stroke movements of the two delivery pistons are performed. According to step a), the two delivery pistons can be moved in opposite directions relative to each other. Thus, one of the delivery pistons can perform a suction stroke while the other performs an exhaust stroke. The method also comprises a step b) in which – while the opposing stroke movements are being performed – the instantaneous piston positions of the delivery pistons relative to the delivery cylinders are monitored in order to determine an initial value for any stroke asynchrony of the opposing stroke movements based on the piston positions. In particular, the instantaneous piston position of each delivery piston relative to the delivery cylinder guiding that delivery piston is monitored.The method according to the invention further comprises a step c) according to which – once the initial value of the stroke asynchrony has been determined – hydraulic fluid is drained by means of the valve device in such a way that the oscillation volume is reduced and the stroke asynchrony is changed relative to the initial value. According to a further step d) of the method, once hydraulic fluid has been drained, hydraulic fluid is supplied again by means of the valve device in such a way that the oscillation volume is increased again and the stroke asynchrony is readjusted to the initial value, in particular changed back to the initial value.

[0009] The invention thus enables targeted control of stroke asynchrony during the operation of the construction and / or viscous material pumping system, particularly during the conveying of construction and / or viscous material. The supply and discharge of hydraulic fluid can advantageously allow for an automatic, particularly successive and / or stepwise, exchange of the hydraulic fluid within the pump's volume. This exchange of hydraulic fluid within the pump's volume can be used for cooling and / or cleaning the hydraulic fluid, especially the circulating fluid. The construction material can be a viscous material. The construction material can be a paste-like mixture of different substances. The viscous material can be mortar, cement, screed, or concrete, each in a mixable and / or pumpable state. In the mixable and / or pumpable state, the viscous material is not yet hardened and / or set.

[0010] "Feeding" refers specifically to "adding hydraulic fluid into the rocker volume." Conversely, "draining" refers specifically to "removing hydraulic fluid from the rocker volume."

[0011] The terms "encompass" or "have" can be used synonymously with each other and with the term "exhibit".

[0012] The phrase "as well as alternatively or additionally" can be replaced by the phrase "and / or" with the same meaning, and vice versa.

[0013] In this context, "control" can mean "steer" and / or "regulate." Similarly, "controllable" can mean "controllable" and / or "regulatory."

[0014] The procedure is preferably executed automatically. Alternatively or additionally, the procedure, in particular individual and / or several steps of the procedure, can be computer-implemented.

[0015] In an embodiment of the invention, when step c) is carried out, the rocking volume is reduced by a predetermined discharge volume of hydraulic fluid.

[0016] In a further embodiment of the invention, the determined initial value of the stroke asynchrony is stored before steps c) and d) are carried out. In particular, the determined initial value of the stroke asynchrony is stored by means of an electronic control device of the construction and / or high-viscosity pumping system.

[0017] In a further embodiment of the invention, a discharge valve characteristic value of the controllable valve device is determined during the discharge process when step c) is carried out.

[0018] In a further embodiment of the invention, a feed valve characteristic value of the controllable valve assembly is determined during the feeding process when step d) is carried out. Advantageously, the discharge valve characteristic value and / or the feed valve characteristic value is a flow characteristic value of the controllable valve assembly. The flow characteristic value can be a measure of the achievable flow rate of hydraulic fluid through the controllable valve assembly. The flow characteristic value can be expressed in units of m 3 The flow rate can be specified in / h. The flow characteristic can be interpreted as the effective cross-sectional area of ​​the controllable valve device. The flow characteristic can be a flow coefficient, in particular a Kv value, of the controllable valve device.

[0019] In a further embodiment of the invention, the construction and / or viscous material pumping device, particularly for carrying out the process, has a storage chamber for the construction and / or viscous material to be pumped, which can be alternately connected to the pumping chambers and is capable of conveying the construction and / or viscous material. The storage chamber can be at least partially delimited by a storage container of the construction and / or viscous material pumping device, which is particularly funnel-shaped. The storage container can be filled with construction and / or viscous material, particularly from above. The construction and / or viscous material pumping device has a discharge port, which can be alternately connected to the pumping chambers and is capable of conveying the construction and / or viscous material, for discharging the pumped construction and / or viscous material. The discharge port can form a pump outlet of the construction and / or viscous material pumping device, through which the pumped construction and / or viscous material can be fed to a distribution system that can be connected to the discharge port.The construction and / or high-viscosity pumping system has an S-shaped pipe body that is adjustable within the reservoir. The S-shaped pipe body can form a pipe diverter within the construction and / or high-viscosity pumping system. In particular, the S-shaped pipe body is pivotable back and forth within the reservoir. The S-shaped pipe body is adjustable within the reservoir such that, by means of the S-shaped pipe body, one of the pumping chambers can be alternately connected to the discharge port and the other to the reservoir for conveying construction and / or high-viscosity materials. The construction and / or high-viscosity pumping system has a hydraulic system, in particular a further hydraulic system, for adjusting the S-shaped pipe body. In particular, the hydraulic system, in particular a further hydraulic system, is designed to adjust the S-shaped pipe body in accordance with the stroke movements of the pumping pistons.In step d) of the process, hydraulic fluid supplied to the system is withdrawn from the hydraulic system, particularly the secondary hydraulic system. The hydraulic fluid supplied according to step d) can therefore be withdrawn from the secondary hydraulic system, which is designed to adjust the S-shaped pipe body. Specifically, the hydraulic fluid supplied to the hydraulic system is withdrawn at a constant hydraulic pressure of 190 bar. In a further embodiment of the invention, the construction and / or viscous material pumping device, particularly for carrying out the process, has a tank for receiving hydraulic fluid. In particular, this tank is essentially at ambient pressure. In step d), the withdrawn hydraulic fluid is received by means of the tank.

[0020] In a further embodiment of the invention, the construction and / or thick-substantiate pumping device, in particular for carrying out the method, has a piston position monitoring device for, in particular indirectly or directly, monitoring the instantaneous piston positions of the conveying pistons relative to the conveying cylinders.

[0021] In a further embodiment of the invention, the drive hydraulic system has two volume-variable rocking chambers. Each rocking chamber is limited, in particular volume-variable, by means of a hydraulic cylinder of the drive hydraulic system and a hydraulic piston of the drive hydraulic system, which is adjustable within the respective hydraulic cylinder. Furthermore, the drive hydraulic system has a rocking hydraulic line that fluidly connects the two rocking chambers to each other in order to define the rocking volume together with the rocking chambers. The rocking volume can therefore be composed of the volumes of the rocking chambers and the rocking hydraulic line. One of the hydraulic pistons and one of the delivery pistons are physically connected to each other, in particular in pairs, especially by means of a piston rod.Therefore, each of the hydraulic pistons can be physically coupled to each of the conveying pistons, in particular by means of the associated piston rod.

[0022] In a further embodiment of the invention, the drive hydraulic system has two variable-volume drive chambers. Each drive chamber is directly opposite one of the rocking chambers by means of a hydraulic cylinder and a hydraulic piston adjustable within that cylinder. Specifically, one of the hydraulic pistons is located directly between one of the rocking chambers and one of the working chambers. The working chambers can be alternately pressurized with hydraulic fluid to adjust the delivery pistons relative to the delivery cylinders. By pressurizing a particular working chamber with hydraulic fluid, the delivery piston defining that working chamber can also be pressurized with hydraulic fluid to adjust this hydraulic piston and thus the delivery piston, which is physically coupled to this hydraulic piston.The drive hydraulic system may expediently include a controllable drive hydraulic pump, by means of which the drive chambers can be alternately supplied with hydraulic fluid.

[0023] A construction and / or viscous material pumping device according to the invention serves for conveying construction and / or viscous materials. The construction and / or viscous material pumping device according to the invention is configured for operation according to a method according to the invention as described above. The advantages of the method according to the invention, as explained above, are thus also at least partially transferred to the construction and / or viscous material pumping device according to the invention. The construction and / or viscous material pumping device has a control device, in particular an electronic one, which is configured and / or set up and / or programmed for controlling, in particular the valve assembly, the drive hydraulic system of the construction and / or viscous material pumping device. In particular, the control device is configured and / or set up and / or programmed for carrying out the method according to the invention.The electrical control unit is connected to a piston position monitoring device of the construction and / or high-viscosity pumping unit. In particular, the control unit receives information about the current piston positions of the conveying pistons from the piston position monitoring device.

[0024] BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Further advantages and features of the invention will become apparent from the claims and from the following description of preferred embodiments of the invention, which are illustrated with reference to the drawings. Reference numerals refer to identical, similar, or functionally equivalent components.

[0026] It is understood that the features mentioned above and those to be explained below can be used not only in the combinations specified, but also in other combinations or on their own, without leaving the scope of the present invention.

[0027] Fig. 1 schematically shows a structure of an embodiment of a construction and / or thick-substantiate pumping device according to the invention, which can be operated according to an embodiment of a method according to the invention, and Fig. 2 schematic diagrams for time courses of piston positions of two conveying pistons of the construction and / or thick-substantiate pumping device according to Fig. 1 in operation according to an embodiment of the method according to the invention, as well as a time course of a stroke asynchrony of opposing stroke movements of the conveying pistons.

[0028] DETAILED DESCRIPTION OF THE EXECUTION EXAMPLES

[0029] A construction and / or viscous material pumping unit 1 is designed for pumping construction and / or viscous material B. The construction and / or viscous material pumping unit 1 can be part of a truck-mounted concrete pump or a trailer-mounted concrete pump.

[0030] The construction and / or high-viscosity pumping device has two separate conveying chambers, F1 and F2. Both conveying chambers, F1 and F2, have variable volumes. The construction and / or high-viscosity pumping device 1 has two conveying cylinders, Z1 and Z2. The construction and / or high-viscosity pumping device 1 has two conveying pistons, K1 and K2. In each of the conveying cylinders, Z1 and Z2, one of the conveying pistons, K1 and K2, is adjustable. The variable-volume conveying chambers, F1 and F2, are each limited by one of the conveying cylinders, Z1 and Z2, and by one of the conveying pistons, K1 and K2. Specifically, conveying chamber F1 is limited by conveying cylinder Z1 and by conveying piston K1, while conveying chamber F2 is limited by conveying cylinder Z2 and by conveying piston K2.

[0031] The construction and / or high-viscosity pumping device 1 has a drive hydraulic system 2, which is designed to actuate the delivery pistons K1, K2 relative to the delivery cylinders Z1, Z2. Hydraulic fluid H flows through the drive hydraulic system 2. The drive hydraulic system 2 has a controllable valve assembly 4. The valve assembly 4 is designed to adjust a oscillating volume 3 to the hydraulic fluid H, whereby the two delivery pistons K1, K2 are hydraulically coupled by means of this oscillating volume 3.

[0032] A method for operating the construction and / or high-viscosity pumping device 1 comprises a step a) in which opposing stroke movements M1, M2 of the conveying pistons K1, K2 are performed. In the illustration of Fig. 1, the conveying piston K1 is currently performing a stroke movement M1 to the right relative to the conveying cylinder Z1, while simultaneously the conveying piston K2 is performing a stroke movement M2 to the left relative to the conveying cylinder Z2. After completion of the stroke movements M1, M2 shown, the conveying pistons K1, K2 can each perform a further stroke movement M1, M2 in the opposite direction to that shown in the illustration.

[0033] According to a further step b) of the procedure, the instantaneous piston positions P1, P2 of the conveying pistons K1, K2 relative to the conveying cylinders Z1, Z2 are monitored over time while the opposing stroke movements M1, M2 are executed. Based on the monitored piston positions P1, P2, an initial value W of a stroke asynchrony A of the opposing stroke movements M1, M2 is determined according to step b). The stroke asynchrony A can express how, in particular by what amount and / or by what percentage, the stroke movements M1, M2 deviate from a perfectly synchronous counter-rotation. In particular, the stroke asynchrony A depends on the rocking volume 3.

[0034] The procedure also includes a step c), according to which hydraulic fluid H is drained by means of the valve assembly 4 in such a way that the rocking volume 3 is reduced and the stroke asynchrony A is changed relative to the initial value W. The draining according to step c) only takes place after the initial value W has been determined.

[0035] Furthermore, the method includes a step d) according to which hydraulic fluid H is supplied by means of the valve assembly 4 such that the rocking volume 3 is increased again and the stroke asynchrony A is restored to the initial value W. The supply according to step d) only occurs after the fluid has been discharged. Steps b), c), and d) are carried out sequentially in the temporal order b) - c) - d), specifically during the execution of step a).

[0036] For example, step d) can compensate for the change in stroke asynchrony A that occurred during step c). If step c) resulted in an increase in stroke asynchrony A relative to the initial value W, step d) can subsequently reduce the stroke asynchrony A back to the initial value W.

[0037] For example, when step c) is performed, the rocking volume 3 is reduced by a predetermined discharge volume of hydraulic fluid H.

[0038] The construction and / or viscous material pumping unit 1 includes a control device 5 designed to monitor the drive hydraulic system 2. The valve assembly 4 of the drive hydraulic system 2 can be monitored by means of the control device 5. The control device 5 can be electronic, as in this case. The construction and / or viscous material pumping unit 1 also has a piston position monitoring device 11. The piston position monitoring device 11 is connected to the control device 5, in particular to provide the control device 5 with information about the current piston positions P1 and P2. Based on the current piston positions P1 and P2, the control device 5 can automatically determine the stroke asynchrony A.

[0039] For example, the determined initial value W of the stroke asynchrony A is stored before steps c) and d) are carried out. In this case, the initial value W is stored by means of the electronic control device 5 before steps c) and d) are performed. The initial value W can be a maximum value of the stroke asynchrony A during the execution of the stroke movements M1 and M2.

[0040] For example, during the discharge process according to step c), a discharge valve characteristic value of the controllable valve device 4 is determined. The discharge valve characteristic value can be stored using the electronic control device 5.

[0041] For example, during the feeding process according to step d), a feed-in valve characteristic value of the controllable valve device 4 is determined. The feed-in valve characteristic value can be stored using the electronic control device 5.

[0042] The construction and / or viscous material pumping device 1 has a storage chamber 6 for holding the construction and / or viscous material B to be pumped. The pumping chambers F1 and F2 can be alternately connected to the storage chamber 6 for conveying the construction and / or viscous material. The construction and / or viscous material pumping device 1 also has a discharge port 7 for discharging the pumped construction and / or viscous material B. The discharge port 7 can be alternately connected to each of the pumping chambers F1 and F2 for conveying the construction and / or viscous material. Furthermore, the construction and / or viscous material pumping device 1 has an S-shaped pipe body 8, which is adjustable within the storage chamber 6 – in this case, pivotable back and forth. The S-shaped pipe body within the storage space 6 is adjustable in such a way that one of the conveying spaces F1, F2 is alternately connected to the pressure nozzle 7 and the other of the conveying spaces F2, F1 is connected to the storage space 6 in a way that conducts building materials and / or thick materials.

[0043] In a first position of the S-shaped pipe body 8, the conveying chamber F1 is connected to the pressure port 7 via the pipe body 8 in a manner that allows the flow of materials and / or viscous substances, while the other conveying chamber F2 is directly connected to the storage chamber 6 in a manner that allows the flow of materials and / or viscous substances. In a second position of the pipe body 8, the conveying chamber F2 can be connected to the pressure port 7 via the pipe body 8 in a manner that allows the flow of materials and / or viscous substances, whereas the other conveying chamber F1 is directly connected to the storage chamber 6 in a manner that allows the flow of materials and / or viscous substances. The pipe body 8 can be adjustable between its two positions, in particular pivotable back and forth.

[0044] The construction and / or viscous material pumping device 1 includes, in particular, a further hydraulic system 9 for adjusting the S-shaped pipe body 8. For example, the hydraulic system 9 is designed to adjust the S-shaped pipe body 8 in accordance with the stroke movements M1, M2 of the delivery pistons K1, K2. The hydraulic system 9 and the drive hydraulic system 2 can be connected to each other.

[0045] For example, when step d) is performed, hydraulic fluid H supplied to hydraulic system 9 is withdrawn. The hydraulic fluid H withdrawn from hydraulic system 9 for supply can be withdrawn from hydraulic system 9 at a constant hydraulic pressure of 190 bar.

[0046] For example, the construction and / or high-viscosity pumping unit 1 has a tank 10. In this case, the tank 10 is designed to hold hydraulic fluid H. The pressure inside the tank 10, particularly in an interior compartment, can be essentially ambient pressure pU. The interior compartment of the tank 10 can therefore be connected to an external environment surrounding the tank 10 and / or the construction and / or high-viscosity pumping unit 1, thus equalizing the pressure. For example, the hydraulic fluid H discharged during step c) is received by means of the tank 10. The discharged hydraulic fluid H can therefore be supplied to the tank 10.

[0047] The drive hydraulic system 2 has two variable-volume rocking chambers S1 and S2. Each rocking chamber S1 and S2 is delimited by a hydraulic cylinder HZ1 and HZ2 of the drive hydraulic system 2, respectively, and by a hydraulic piston HK1 and HK2 of the drive hydraulic system 2, which is adjustable within the respective hydraulic cylinder HZ1 and HZ2. The drive hydraulic system 2 also has a rocking hydraulic line SL that fluidly connects the two rocking chambers S1 and S2. The rocking hydraulic line SL, together with the rocking chambers S1 and S2, defines the rocking volume 3. One of the hydraulic pistons HK1 and HK2 and one of the delivery pistons K1 and K2 are physically connected. In this case, hydraulic piston HK1 is physically connected to delivery piston K1, while hydraulic piston HK2 and delivery piston K2 are physically connected.For the physical connection of the hydraulic piston HK1 to the delivery piston K1, and for the physical connection of the hydraulic piston H2 to the delivery piston K2, a piston rod KS1 and KS2 are provided in each case. In particular, the delivery piston K1, the hydraulic piston HK1, and the piston rod KS1 form a uniformly adjustable group, while the other delivery piston K2, the other hydraulic piston HK2, and the other piston rod KS2 form a different uniformly movable group.

[0048] The drive hydraulic system 2, for example, has two variable-volume drive chambers A1 and A2. In this case, each drive chamber A1 and A2 is delimited by one of the hydraulic cylinders HZ1 and HZ2 and by the hydraulic piston HK1 and HK2, which is adjustable within this hydraulic cylinder HZ1 and HZ2. The hydraulic pistons HK1 and HK2 delimit the respective rocking chamber S1 and S2 on one side of the respective hydraulic piston HK1 and HK2, which is located directly opposite the respective drive chambers A1 and A2. Accordingly, hydraulic piston HK1 is located directly between drive chamber A1 and rocking chamber S1. The other hydraulic piston HK2 is located directly between the other drive chamber A2 and the other rocking chamber S2. The drive chambers A1, A2 can be alternately supplied with hydraulic fluid H in order to adjust the delivery pistons K1, K2 relative to the delivery cylinders Z1, Z2 by means of the hydraulic pistons HK1, HK2.For supplying hydraulic fluid H to the drive chambers A1, A2, a controllable drive hydraulic pump AP of the construction and / or thick material pumping device 1 is provided.

[0049] The piston position monitoring device 11 of the construction and / or high-viscosity pumping device 1 serves to monitor the instantaneous piston positions P1, P2 of the delivery pistons K1, K2 relative to the delivery cylinders Z1, Z2. According to the embodiment shown in Fig. 1, the piston position monitoring device 11 detects the positions of the hydraulic pistons HK1, HK2, in particular directly. Due to the previously described physical connection of the hydraulic pistons HK1, HK2 with each of the delivery pistons K1, K2 – realized here by means of two piston rods KS1, KS2 – the instantaneous piston positions P1, P2 of the delivery pistons K1, K2 are, in the example shown, directly dependent on the positions of the hydraulic pistons HK1, HK2.Accordingly, the current piston positions P1, P2 of the conveying pistons K1, K2 can be monitored by means of the piston position monitoring device 11, even though the conveying pistons K1, K2 are not directly detected by the piston position monitoring device 11. It is understood that in other embodiments the piston position monitoring device 11 may be configured alternatively or additionally for the direct detection of the piston positions P1, P2 of the conveying pistons K1, K2.

Claims

Patent claims 1. Method for operating a construction and / or viscous material pumping device (1) for conveying construction and / or viscous material (B), wherein the construction and / or viscous material pumping device (1) comprises: two variable-volume conveying chambers (F1, F2), wherein the conveying chambers (F1, F2) are each delimited by means of a conveying cylinder (Z1, Z2) of the construction and / or viscous material pumping device (1) and by means of a conveying piston (K1, K2) of the construction and / or viscous material pumping device (1) adjustable in the respective conveying cylinder (Z1, Z2), and a hydraulic drive system (2) through which hydraulic fluid (H) can flow for adjusting the drive of the conveying pistons (K1, K2) relative to the conveying cylinders (Z1, Z2), - wherein the drive hydraulic system (2) has a controllable valve device (4) for adjusting a rocking volume (3) to hydraulic fluid (H) which hydraulically couples the movement of the delivery pistons (K1 , K2); - wherein the method comprises the steps: a) performing counter-rotating stroke movements (M1, M2) of the conveying pistons (K1, K2), b) while the counter-rotating stroke movements (M1, M2) are being performed: monitoring instantaneous piston positions (P1, P2) of the conveying pistons (K1, K2) relative to the conveying cylinders (Z1, Z2) in order to determine an initial value (W) of a stroke asynchrony (A) of the counter-rotating stroke movements (M1, M2) based on the piston positions (P1, P2), c) when the initial value (W) has been determined: draining hydraulic fluid (H) by means of the valve assembly (4) so ​​that the oscillation volume (3) is reduced and the stroke asynchrony (A) is changed relative to the initial value (W), and d) when draining has taken place: supplying hydraulic fluid (H) by means of the valve assembly (4) so ​​that the oscillation volume (3) is increased again and the stroke asynchrony (A) is increased Asynchronicity (A) is reset to the initial value (W).

2. Method according to the preceding claim, - wherein the rocking volume (3) is reduced by a predetermined discharge volume of hydraulic fluid (H) when step c) is carried out.

3. Method according to any one of the preceding claims, - wherein the determined initial value (W) of the stroke asynchrony (A) is stored in time before the execution of steps c) and d), in particular by means of an electronic control device (5) of the construction and / or thick material pumping device (1).

4. Method according to any one of the preceding claims, - wherein during the discharge process according to step c) a discharge valve characteristic value of the controllable valve device (4) is determined.

5. Method according to any one of the preceding claims, - wherein, during the feeding process according to step d), a feed-in valve characteristic value of the controllable valve device (4) is determined.

6. Method according to any one of the preceding claims, - wherein the construction and / or viscous material pumping device (1) comprises: a storage chamber (6) for storing construction and / or viscous material (B) to be conveyed, which can be alternately connected to the conveying chambers (F1, F2) in a manner suitable for conveying construction and / or viscous material; a pressure port (7) for discharging conveyed construction and / or viscous material (B) in a manner suitable for conveying construction and / or viscous material; an S-shaped pipe body (8) which is adjustable, in particular pivotable, within the storage chamber (6) in order to alternately connect one of the conveying chambers (F1, F2) to the pressure port (7) and the other of the conveying chambers (F2, F1) to the storage chamber (6) in a manner suitable for conveying construction and / or viscous material; a hydraulic system (9), in particular a further hydraulic system, for adjusting the S-shaped pipe body (8), in particular adapted to the lifting movements (M1 , M2) of the conveying pistons (K1 , K2); - wherein the hydraulic fluid (H) supplied during step d) is taken from the, in particular further, hydraulic system (9), in particular at a hydraulic pressure of constant 190 bar.

7. Method according to any of the preceding claims, - wherein the construction and / or viscous material pumping device (1) has a tank (10) for receiving hydraulic fluid (H), in particular wherein the tank (10) is essentially at ambient pressure (pU); - wherein the hydraulic fluid (H) discharged during step c) is received by means of the tank (10).

8. Method according to any one of the preceding claims, - wherein the construction and / or thick material pumping device (1) has a piston position monitoring device (11) for monitoring the instantaneous piston positions (P1 , P2) of the conveying pistons (K1, K2) relative to the conveying cylinders (Z1, Z2).

9. Method according to any one of the preceding claims, - wherein the drive hydraulic system (2) comprises: two volume-variable rocking chambers (S1, S2), wherein the rocking chambers (S1, S2) are each limited by a hydraulic cylinder (HZ1, HZ2) of the drive hydraulic system (2) and by a hydraulic piston (HK1, HK2) of the drive hydraulic system (2) which is adjustable in the respective hydraulic cylinder (HZ1, HZ2), a rocking hydraulic line (SL) which fluidly connects the two rocking chambers (S1, S2) to each other in order to define the rocking volume (3) together with the rocking chambers (S1, S2), - wherein one of the hydraulic pistons (HK1 , HK2) and one of the delivery pistons (K1 , K2) are physically connected to each other.

10. Method according to the preceding claim, - wherein the drive hydraulic system (2) comprises: two volume-variable drive chambers (A1 , A2), wherein the drive chambers (A1 , A2) are each directly opposite one of the rocking chambers (S1 , S2) by means of one of the hydraulic cylinders (HZ1 , HZ2) and by means of the hydraulic piston (HK1 , HK2) adjustable in this hydraulic cylinder (HZ1 , HZ2), - wherein the drive chambers (A1 , A2) can be alternately supplied with hydraulic fluid (H) in order to adjust the delivery pistons (K1, K2) relative to the delivery cylinders (Z1, Z2) by means of the hydraulic pistons (HK1 , HK2).

11. Construction and / or viscous material pumping device (1) for conveying construction and / or viscous material (B), wherein the construction and / or viscous material pumping device (1) is designed for operation according to a method according to one of the preceding claims and comprises: a control device (5) connected to a piston position monitoring device (11) of the construction and / or viscous material pumping device (1), in particular electronic, for controlling, in particular the valve device (4), the drive hydraulic system (2).

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