JP-7855630-B2 - Method for evaluating the wear condition of parts of a rotary press machine and rotary press machine

Inventors

• ヴァルプ スヴェン
• ゲス ヨッヘン
• ノヴィコヴァ アンナ

Assignees

• フェッテ コンパクティング ゲーエムベーハー

Dates

Publication Date

20260508

Application Date

20240424

Priority Date

20230426

Claims (16)

1. A method for evaluating the wear condition of parts of a rotary press, wherein the rotary press comprises a rotor rotatable using a rotary drive, the rotor comprising an upper punch guide (18) for an upper pressure punch (14), a lower punch guide (20) for a lower pressure punch (16), and a die plate (10) positioned between the punch guides, the pressure punches (14, 16) interacting with the cavity (12) of the die plate (10), the rotary press further comprising a filling device (26), the filling device (26) filling the cavity (12) of the die plate (10) with powder material to be pressurized, and the rotary press The press machine is equipped with a pressure device (34), which, during operation, cooperates with the upper pressure punch (14) and the lower pressure punch (16) to press-fit powder material into the cavity (12) of the die plate (10) to form pellets, and the rotary press machine is equipped with a control cam that cooperates with the punch heads of the pressure punches (14, 16) to control the axial movement of the pressure punches (14, 16), and the control cam is equipped with a discharge cam (56) that controls the lower pressure punch to discharge the pellets produced in the cavity (12) from the cavity (12), and the method is characterized by comprising the following steps: - Using at least one force sensor (64), measure the discharge force acting on the discharge cam (56) during the operation of the rotary press as a measured value, and using at least one vibration sensor (58, 60, 62), measure the vibrations generated during the operation of the rotary press as a measured value. - A step in which the measured values are sent to an evaluation device (52), and the evaluation device (52) evaluates the wear condition of the parts of the rotary press machine based on the obtained measured values.
2. The method according to claim 1, characterized in that the wear state of the discharge cam (56) is evaluated by the evaluation device (52).
3. The method according to claim 1 , characterized in that a force sensor (64) is located on the discharge cam (56).
4. The method according to claim 1, characterized in that vibration sensors (58, 60, 62) are disposed on the discharge cam (56) and/or the pressure device (34), in particular on the pressure rollers (40, 42) of the pressure device (34) and/or on the support portions (39, 41) of the pressure rollers (40, 42) of the pressure device (34), and/or on the metering cam (54) of the control cam for metering the powder material filled in the cavity (12) of the die plate (10 ).
5. The method according to claim 1 , characterized in that the measured values are recorded as measurement curves, particularly time-dependent measurement curves.
6. The method according to claim 1 , characterized in that the wear state of the part is evaluated by the evaluation device (52) based on a comparison of the obtained measured value with a reference value.
7. The method according to claim 6, characterized in that the evaluation device (52) detects an increase in wear of the part when the obtained measurement value deviates from a reference value, and/or when the amplitude of the obtained measurement value changes compared to the reference value, and/or when the slope of the obtained measurement value changes compared to the reference value.
8. The method according to claim 6 , characterized in that if the obtained measurement value deviates from the reference value by at least one specified limit value, the evaluation device (52) detects that the part has worn further.
9. The method according to claim 8, characterized in that the at least one specified limit value is defined and/or adjusted by an operator, and/or the at least one specified limit value is defined and/or adjusted by an algorithm, particularly a machine learning algorithm.
10. The method according to claim 1 , characterized in that the evaluation device (52) displays the results of the evaluation of the wear state of the part to the operator.
11. The method according to claim 1 , characterized in that when it is detected that the aforementioned part has worn down further, the evaluation device (52) outputs a warning message.
12. The method according to claim 11, characterized in that the warning message includes a suggestion for cleaning and/or reworking and/or replacement of more worn parts.
13. A rotary press comprising a rotor, the rotor comprising an upper punch guide (18) for an upper pressure punch (14), a lower punch guide (20) for a lower pressure punch (16), and a die plate (10) positioned between the punch guides, wherein the pressure punches (14, 16) interact with the cavity (12) of the die plate (10), the rotary press further comprising a filling device (26), the filling device (26) filling the cavity (12) of the die plate (10) with powder material to be pressurized, and the rotary press further comprising a pressure device ( 34) comprising the pressure device (34) which interacts with the upper pressure punch (14) and the lower pressure punch (16) during operation to press-fit the powder material in the cavity (12) of the die plate (10) into pellets, the rotary press further comprises control cams which interact with the punch heads of the pressure punches (14, 16) to control the axial movement of the pressure punches (14, 16), the control cams which comprises a discharge cam (56) which controls the lower pressure punch to discharge the pellets produced in the cavity (12) from the cavity (12), - The rotary press is equipped with at least one force sensor (64), and the force sensor (64) can be used to measure the discharge force acting on the discharge cam (56) during the operation of the rotary press as a measured value, and the rotary press is equipped with at least one vibration sensor (58, 60, 62), and the vibration sensors (58, 60, 62) can be used to measure the vibrations that occur during the operation of the rotary press as a measured value. A rotary press machine is provided with an evaluation device (52), to which measured values are sent, and the evaluation device (52) is designed to evaluate the wear condition of the parts of the rotary press machine based on the obtained measured values.
14. The method according to claim 13, characterized in that a force sensor (64) is positioned on the discharge cam (56).
15. The method according to claim 13, characterized in that vibration sensors (58, 60, 62) are located on the discharge cam (56) and/or the pressure device (34), in particular on the pressure rollers (40, 42) of the pressure device (34) and/or on the metering cam (54) of the control cam for metering the powder material filled in the cavity (12) of the die plate (10 ).
16. The rotary press according to claim 13 , characterized in that the rotary press, in particular the evaluation device (52), is designed to perform the method according to any one of claims 1 to 12.

Description

This invention relates to a method for evaluating the wear condition of components of a rotary press. The rotary press comprises a rotor rotatable using a rotary drive, the rotor having an upper punch guide for an upper pressure punch, a lower punch guide for a lower pressure punch, and a die plate positioned between these punch guides. The pressure punches interact with the cavity of the die plate. The rotary press further includes a filling device, which fills the cavity of the die plate with powder material to be pressurized. The rotary press also includes a pressure device, which, during operation, cooperates with the upper and lower pressure punches to pressurize the powder material into the cavity of the die plate into pellets. The rotary press also includes a control cam that cooperates with the punch head of the pressure punch to control the axial movement of the pressure punches, and the control cam includes a discharge cam that controls the lower pressure punch to discharge the pellets produced in the cavity from the cavity. This invention also relates to a rotary press. The rotary press comprises a rotor, which includes an upper punch guide for an upper pressure punch, a lower punch guide for a lower pressure punch, and a die plate positioned between these punch guides, the pressure punch interacting with the cavity of the die plate. The rotary press further comprises a filling device, which fills the cavity of the die plate with powder material to be pressurized by this device. The rotary press further comprises a pressure device, which, during operation, interacts with the upper and lower pressure punches to pressurize the powder material in the cavity of the die plate into pellets. The rotary press further comprises a control cam that interacts with the punch head of the pressure punch to control the axial movement of the pressure punch, the control cam includes a discharge cam that controls the lower pressure punch to discharge the pellets produced in the cavity from the cavity. A rotary press typically has multiple upper and lower pressure punches, each paired with one cavity in a die plate. During operation, the upper and lower pressure punches rotate with the die plate, their axial movement controlled by control cams and guided by upper and lower punch guides. While rotating, the die plate passes through various devices of the rotary press, namely the filling and pressure devices. In the filling device, the powder material to be pressurized is guided into the cavity of the die plate; in the pressure device, the upper and lower pressure punches are typically pressed into the cavity by upper and lower pressure rollers to press the powder material into pellets, such as tablets. After the pressure device, the upper pressure punch is guided upward from the cavity, and the pellets produced within the cavity are pushed onto the upper surface of the die plate by the lower pressure punch. To achieve this, a discharge cam is provided, which moves the lower pressure punch upward. For example, the pellets are then scraped out of the die plate by a scraper and fed into the output section of a rotary press for further processing. Rotary presses operate at high rotational speeds, and consequently, high production speeds. Across the numerous corresponding pressurizing processes, wear occurs on various parts of the rotary press, particularly the control cams, especially the discharge cams which experience specific stresses during contact with the press die. Contact with the powder material being pressed can also lead to corresponding wear. More worn parts can lead to a deterioration in pellet quality. For example, a more worn discharge cam may result in defects going undetected during sorting, leading to defective tablets not being removed. Historically, the wear condition of many rotary press parts, especially the discharge cams, has been manually checked by the operator at set maintenance intervals. The drawback of this is that it is not timely to detect wear that may occur in between, potentially leading to a deterioration in tablet quality. Manual wear checks are also time-consuming and cannot be reliably reproduced. Therefore, based on the prior art described above, the object of the present invention is to provide a method and rotary press of the type described at the beginning that can reliably, promptly, and reproducibly evaluate the wear condition of the parts of a rotary press. The present invention achieves this objective by independent claims 1 and 13. Advantageous embodiments are disclosed in the independent claims, specification, and drawings. Regarding the type of method described at the beginning, the present invention achieves this objective by the following steps: - A step of measuring the discharge force acting on the discharge cam during the operation of the rotary press as a measured value using at least one force sensor, and/or measuring the vibrations generated during the operation o