Method for troubleshooting eccentric screw pump of a conveying device for conveying viscous building material

Abstract

The present invention relates to a troubleshooting method for an eccentric screw pump (2) of a conveying device (1) for conveying viscous building materials (BM), comprising the following steps: monitoring the start of conveying operation of the eccentric screw pump (2) by a characteristic parameter monitoring program of the control mechanism (4) of the conveying device (1); wherein, if the characteristic parameter monitoring program detects a characteristic parameter value of one or more characteristic parameters, the control mechanism (4) of the eccentric screw pump (2) executes a free operation program, wherein the characteristic parameter values ​​are stored individually or in combination as fault values, and the fault values ​​indicate jamming of the rotor-stator unit (5) of the eccentric screw pump (2), otherwise a conveying operation is performed; wherein, the eccentric screw pump (2) operates in the free operation program in such a manner that the motor (12) of the drive unit (3) of the conveying device (1) is alternately turned on and off multiple times.

Description

Technical Field

[0001] This invention relates to a troubleshooting method for an eccentric screw pump of a conveying device for conveying viscous building materials as described in the preamble of claim 1. Background Technology

[0002] A method for operating a conveying device for conveying flowable building materials is known from WO 2019 / 215242 A1, wherein a set pressure is controlled based on the detection of at least one characteristic parameter. A conveying device operating in this manner cannot detect and / or eliminate jamming of the rotor-stator unit of an eccentric screw pump during startup. Summary of the Invention

[0003] The purpose of this invention is to provide a troubleshooting method for an eccentric screw pump used in a conveying device for conveying viscous building materials, thereby simplifying the operation of the eccentric screw pump.

[0004] This objective is achieved by the method given in claim 1. Advantageous and suitable improvements are given in the dependent claims.

[0005] A troubleshooting method for an eccentric screw pump in a conveying device for conveying viscous building materials according to the present invention includes the following steps:

[0006] - The start of the conveying operation of the eccentric screw pump is monitored by a monitoring program of the characteristic parameters of the control mechanism of the conveying device;

[0007] -If the characteristic parameter monitoring program detects the characteristic parameter value of one or more characteristic parameters, the control mechanism of the eccentric screw pump executes a free operation program. These characteristic parameter values ​​are stored individually or in combination with each other, especially in the memory, as fault values. These fault values ​​indicate jamming of the rotor-stator unit of the eccentric screw pump. Otherwise, if jamming is not detected, the conveying operation is started.

[0008] - In this system, the eccentric screw pump operates in a free-running mode in such a way that the motor of the drive unit of the conveying device automatically switches on and off repeatedly. This method simplifies the user's operation of the conveying device because the control mechanism of the eccentric screw pump can automatically identify and usually eliminate jams.

[0009] The procedure also stipulates that the characteristic parameter monitoring program should be restarted after the free-running cycle is completed. Specifically, if the characteristic parameter monitoring program detects one or more characteristic parameter values, it restarts the free-running cycle. These characteristic parameter values ​​are stored individually or in combination as fault values, indicating a jam in the rotor-stator unit of the eccentric screw pump; otherwise, the conveying operation is initiated. This ensures that the eccentric screw pump does not run unnecessarily for extended periods during the free-running cycle, thus minimizing waiting time and consequently minimizing the additional load on the eccentric screw pump. Furthermore, this also ensures that more stubborn jams in the eccentric screw pump can be resolved by repeatedly starting the free-running cycle under reasonable load conditions.

[0010] It is also stipulated that, in the free-running procedure, the drive unit, each time it is switched on, either always switches to forward operation only, always switches to reverse operation only, or alternates between forward and reverse operation regularly or irregularly. Actual testing shows that jamming of eccentric screw pumps can usually be resolved through all four variations, or any combination of these four variations.

[0011] Furthermore, it is stipulated that before restarting the free-running procedure, a pause time and / or cooling to the limit temperature are allowed, and the free-running procedure is run only a predetermined number of times before the conveying device is completely shut off. Therefore, the free-running procedure can be executed multiple times without concern about overloading the eccentric screw pump, as the pause time and / or waiting for cooling to the limit temperature ensure that the eccentric screw pump, and especially its drive unit including the transmission and BLDC motor, is only loaded within permissible limits during the free-running procedure. Additionally, if jamming cannot be eliminated through conventional methods, unnecessary loading of the eccentric screw pump is avoided by completely shutting it off.

[0012] The specifications stipulate that, as characteristic parameters, speed and / or current consumption and / or pressure and / or temperature should be detected. By monitoring these characteristic parameters, especially by monitoring multiple such characteristic parameters, it is easy to determine whether the eccentric screw pump is jammed or operating in a conveying mode. These characteristic parameters are available on modern eccentric screw pumps, or can be obtained with minimal technical cost.

[0013] Finally, it is stipulated that the rotational speed and / or current consumption and / or pressure and / or temperature after the rotor-stator unit are stored in the control mechanism's memory as fault values. Thus, the fault values ​​stored in the control mechanism can be used for comparison with currently detected characteristic parameter values.

[0014] In the context of this invention, "jamming" in an eccentric screw pump of a conveying mechanism is understood as the rotor of a rotor-stator unit used to convey viscous building materials becoming stuck in the stator. This jamming occurs particularly when the building material has solidified and / or clumped and / or become extremely viscous. "Jacking" occurs especially when, after the conveying mechanism has been suspended from use, the torque typically applied to the rotor of the rotor-stator unit at startup is insufficient to rotate the rotor in the stator due to lack of lubrication, lack of release agent, or dried mortar or paint residue. In other words, "jamming" is understood as, particularly, the sticking and / or adhesion and / or clumping and / or drying of a rotor, especially one made of metal, in a stator, particularly one made of rubber.

[0015] A key characteristic of this "jamming" is that, despite very high current consumption by the motor, the rotor speed or the motor speed is zero. Another indicator is that the pressure in the system, particularly in the rotor-stator unit and hoses, is zero before reaching the output of the spray gun. This also differs from the characteristic of blockages occurring after an eccentric screw pump in the hoses or spray gun, where the pressure is high before the blockage. Attached Figure Description

[0016] Further details of the invention are described with reference to the schematically illustrated embodiments in the accompanying drawings.

[0017] Figure 1 : A three-dimensional view of the conveying device;

[0018] Figure 2 : Figure 1 Side sectional view of the conveying device shown;

[0019] Figure 3 A schematic flowchart of troubleshooting methods. Detailed Implementation

[0020] Figure 1 A perspective view of a conveying device 1 for implementing the method according to the invention is shown.

[0021] Figure 2 The side view with partial sectioning shows the structure of... Figure 1 A known conveying device 1. Conveying device 1 includes an eccentric screw pump 2, a drive unit 3, and a control mechanism 4. The eccentric screw pump 2 includes a rotor-stator unit 5 having an upstream conveying screw 5a and an outlet 6. Furthermore, the conveying device 1 includes a conveying section 7, schematically shown, connected to the outlet 6 of the rotor-stator unit 5. The conveying section 7 includes a hose 7a and an output device 7b, by which the ejection of the viscous building material BM can be activated and deactivated, and preferably also metered.

[0022] Additionally, the conveying device 1 includes a first pressure sensor 8 and a characteristic parameter detection mechanism 9. Here, the pressure sensor 8 detects the pressure at which the building material is subjected to the pressure at the outlet 6 of the rotor-stator unit 5. The characteristic parameter detection mechanism 9 includes a speed sensor 10, by means of which the rotational speed of the motor 11 of the drive unit 3 of the conveying device 1 can be detected. In this case, the motor 11 is designed as a brushless DC motor, i.e., a so-called BLDC motor 12, and the speed sensor 10 includes at least one Hall sensor directly mounted on the BLDC motor 12. Besides the drive unit 11, the drive unit 3 also includes a transmission section 13 mounted between the drive unit 11 and the eccentric screw pump 2.

[0023] The temperature sensor 14, shown schematically, is mounted on the conveying device. Here, the temperature of the rotor 5b of the rotor-stator unit 5 is detected by the temperature sensor 14.

[0024] Figure 3 The flowchart of the troubleshooting method SBV is shown schematically in the figure.

[0025] Troubleshooting method SBV includes the following steps:

[0026] - The start of the conveying operation of the eccentric screw pump 5 of the conveying device 1 is monitored by the characteristic parameter monitoring program KUP of the control mechanism 4 of the conveying device 1.

[0027] - If the characteristic parameter monitoring program KUP detects the characteristic parameter value of one or more characteristic parameters, the free operation program FAP is executed by the control mechanism 4 of the conveying device 1. These characteristic parameter values ​​are stored individually or in combination as fault values, which indicate the jamming of the rotor-stator unit 5 of the eccentric screw pump 2. Otherwise, the conveying operation FB is started.

[0028] - In the free-working procedure FAP, the eccentric screw pump 5 is operated in such a way that the motor 11 of the drive unit 3 of the conveying mechanism 1 is alternately turned on and off several times.

[0029] As an additional step in the troubleshooting method SBV, the following can be specified:

[0030] - Restart the characteristic parameter monitoring program KUP, wherein if the characteristic parameter monitoring program KUP detects the characteristic parameter value of one or more characteristic parameters, the free operation program FAP is restarted by the characteristic parameter monitoring program KUP. These characteristic parameter values ​​are stored individually or in combination as fault values, which indicate the jamming of the rotor-stator unit 5 of the eccentric screw pump 2. Otherwise, the conveying operation is started.

[0031] Fault values ​​are stored in the memory of the control mechanism.

[0032] According to the Free Operation Program (FAP) specification, when the drive unit 3 is turned on, it either switches to forward operation only, or switches to reverse operation only, or switches to forward and reverse operation alternately in a regular or irregular manner.

[0033] Throughout the fault elimination method SBV, it can be stipulated that before each restart of the free-working procedure FAP, a pause time and / or cooling to the limit temperature are allowed, and the free-working procedure FAP is run only a predetermined number of times before the conveyor is completely shut off. Here, the temperature of rotor 5b is monitored by means of temperature sensor 14 for the limit temperature stored in control mechanism 4.

[0034] In the fault troubleshooting method SBV, temperature and / or pressure and / or speed and / or current consumption after the rotor-stator unit (5) are used as characteristic parameters of the fault value. In this case, speed and current consumption are detected directly on the BLCD motor 12. In this case, pressure and temperature are detected by pressure sensor 8 and temperature sensor 14.

[0035] List of reference numerals in the attached diagram:

[0036] 1 Conveying device

[0037] 2 Eccentric Screw Pump

[0038] 3 drive units

[0039] 4 control mechanisms

[0040] 5 rotor-stator units

[0041] 5a 5 conveyor screw

[0042] 5b 5 rotor

[0043] 6 Exports

[0044] 7 transport sections

[0045] 7a 7 hose

[0046] 7b 7 output device

[0047] 8 pressure sensors

[0048] 9 Feature Parameter Detection Agencies

[0049] 10 speed sensor

[0050] 11 electric motors

[0051] 12BLDC motor

[0052] 13 Transmission Unit

[0053] 14 temperature sensors

[0054] BM adhesive building materials

[0055] FAP Free Work Program

[0056] FB Conveyor Operation

[0057] KUP Feature Parameter Monitoring Program

[0058] Troubleshooting methods for SBV.

Claims

1. A troubleshooting method (SBV) for an eccentric screw pump (2) in a conveying device (1) for conveying viscous building materials (BM), comprising the following steps: - The start of the conveying operation of the eccentric screw pump (2) is monitored by the characteristic parameter monitoring program (KUP) of the control mechanism (4) of the conveying device (1); -If the characteristic parameter monitoring program (KUP) detects the characteristic parameter value of one or more characteristic parameters, the control mechanism (4) of the eccentric screw pump (2) executes the free operation program (FAP), wherein the characteristic parameter value is stored individually or in combination as a fault value, which indicates the jamming of the rotor-stator unit (5) of the eccentric screw pump (2); otherwise, the conveying operation (FB) is started. -In this process, the eccentric screw pump (2) operates in the free-operation program (FAP) in such a manner that the motor (12) of the drive unit (3) of the conveying device (1) is alternately switched on and off multiple times. Before each restart of the Free Work Program (FAP), the pause time is allowed to pass and / or the temperature is cooled to the limit, and the Free Work Program (FAP) is run only a specified number of times before the conveying device is completely shut off.

2. The method according to claim 1, characterized in that, After the Free Processing Program (FAP) is completed, the Characteristic Parameter Monitoring Program (KUP) is restarted, wherein, - Alternatively, if the Feature Parameter Monitoring Program (KUP) detects a feature parameter value for one or more feature parameters, the KUP restarts the Free Operation Program (FAP), wherein the feature parameter values ​​are stored individually or in combination as fault values ​​that indicate jamming of the rotor-stator unit (5) of the eccentric screw pump (2). - Either, or initiate the transport operation.

3. The method according to claim 1 or 2, characterized in that, In the Free Operation Program (FAP), the drive unit (3) operates each time it is switched on: o Either always switch to forward execution only, o Either always switch to reverse execution, o or regularly or irregularly alternate between the forward and reverse operations.

4. The method according to claim 1 or 2, characterized in that, As characteristic parameters, temperature and / or pressure and / or current consumption and / or rotational speed are detected after the rotor-stator unit (5).

5. The method according to claim 1 or 2, characterized in that, Temperature and / or pressure and / or current consumption and / or speed after the rotor-stator unit (5) are stored in the memory of the control mechanism (4) as fault values.

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