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KR-102963901-B1 - METHOD FOR DETECTING A TENSILE STRESS OF A CIRCUMFERENTIAL BELT

KR102963901B1KR 102963901 B1KR102963901 B1KR 102963901B1KR-102963901-B1

Abstract

A case for a method for detecting tensile stress of a circumferential belt (5) deflected around a tension roller (4) is disclosed. In this way, the running length of the circumferential belt (5) is changed by adjusting the tension roller (4). A force measuring device (10) is provided, wherein the force measurement changes along with the adjustment path (6) of the tension roller (4). To enable reliable detection of tensile stress, sensitivities of the force measuring device (10) with respect to tensile stress are determined for different points on the adjustment path. These sensitivities or calculated values are stored in memory (32), which is accessed by a controller (15). It calculates the tensile stress by interpolation from the current adjustment path (6), the current bearing force, and the stored sensitivities or values.

Inventors

  • 벤츠코브슈키 위르겐

Assignees

  • 텍스마그 게엠베하 베르트리에브스게셀스차프트

Dates

Publication Date
20260511
Application Date
20200521
Priority Date
20190607

Claims (9)

  1. A method for detecting tensile stress of a circumferential belt (5) deflected by at least one tension roller (4) adjusted to change the running length of the circumferential belt (5) around an adjustment path (6), wherein the bearing force (12) of at least one tension roller (4) of at least one force measuring device (10) is measured in at least one direction depending on the adjustment path (6) of at least one tension roller (4). A method characterized by determining the sensitivity of at least one force measuring device (10) for each point of the adjustment path in relation to the tensile stress, storing at least one of the sensitivities and values calculated therefrom as an array in at least one memory (32), and having at least one controller (15) access the at least one memory to calculate the tensile stress by interpolation from the current adjustment path (6), the current bearing force (12), and at least one of the stored sensitivities and values.
  2. In paragraph 1, A method characterized in that the sensitivities at points of the above adjustment path are calculated from force measurements and tensile stress measurements.
  3. In paragraph 1, A method characterized in that the sensitivities at points of the above adjustment path are calculated from geometric conditions.
  4. In paragraph 3, A method characterized in that the sensitivities at points of the above adjustment path are calculated from the wrapping angles of the belt (5) around the at least one tension roller (4) and the inclination angle of the at least one force measuring device (10).
  5. In any one of paragraphs 1 through 4, The above interpolation method is characterized by being linear.
  6. In any one of paragraphs 1 through 4, The above interpolation method is a method characterized by being quadratic.
  7. In any one of paragraphs 1 through 4, The above interpolation method is characterized by using an interpolation polynomial having a degree one less than the number of stored sensitivities.
  8. In any one of paragraphs 1 through 4, A method characterized in that at least one tension roller (4) is pivoted around a pivot axis (8).
  9. In any one of paragraphs 1 through 4, A method characterized in that at least one tension roller (4) moves in a linear manner.

Description

Method for detecting tensile stress of a circular belt The present invention relates to a method for detecting tensile stress of a circumferential belt deflected by at least one tension roller. Such tension roller is adjustable and connected to a force measuring device that detects the bearing force of the tension roller. A general method is known from DE 10 2015 008 219 A1. In this method, a circumferential belt is deflected by several rollers, one of which can be adjusted as a tension roller and formed as a force measuring roller. Consequently, since the direction of force measurement changes according to the adjustment motion, the force measurement value measured by the force measuring device can no longer be accurately related to tensile stress. Therefore, the aforementioned publication suggests compensating at least partially for the effects of different measurement directions by an appropriate arrangement of rollers that have an effect due to changes in the wrapping angle of the tension roller. However, since this compensation does not work completely, systematic measurement errors remain. This is recognized as detrimental. Furthermore, there are installation situations where the arrangement according to the aforementioned publication is not feasible or can only be implemented with a considerable amount of effort. However, even for these applications, there is a need to implement tensile stress detection at a reliable level. FIG. 1 is a schematic spatial representation of a device for clamping a circumferential belt at a first end point. FIG. 2 illustrates an apparatus according to the present invention according to FIG. 1 at a second end point. FIG. 3 illustrates an alternative embodiment of the device according to FIG. 1 at the first end point. FIG. 4 illustrates an apparatus according to the present invention according to FIG. 3 at a second end point. FIG. 5 illustrates a first embodiment of a force measuring device. FIG. 6 illustrates a second embodiment of a force measuring device. Figure 7 illustrates the basic circuit of the controller. The device according to FIGS. 1 and 2 includes a first guide roller (2) and a second guide roller (3), with a tension roller (4) provided between them. The guide rollers (2, 3) and the tension roller (4) deflect a circumferential belt (5), wherein the tension roller (4) is adjustable along an adjustment path (6). The length of the track path of the circumferential belt (5) can be adjusted thereby to set it to the required tension. To adjust the circumferential belt (5), the tension roller (4) is held on a pivoting setting support (7). It is steered on a pivot axis (8) that forms the center point (M) of the adjustment path (6). The gap (9) between the pivot axis (8) and the outer contour of the tension roller (4) forms the radius (r) of the adjustment path (6). This pivot bearing of the tension roller (4) is generally very easy to implement by providing a rotary bearing corresponding to the pivot axis (8). This results in a very robust structure, whereby the edge of the setting support (7) is reliably prevented when a force is generated that is not directed in the adjustment direction. Another advantage of this geometric structure is that it results in a very compact structure, which can be particularly useful when exposed to a limited space. The tension roller (4) is connected to the setting support (7) via a force measuring device (10). This detects the bearing force (12) of the tension roller (4) in the measurement direction (11). Thus, the force measuring device (10) of the vector bearing force (12) detects only the corresponding component projected in the direction of the measurement direction (11). Meanwhile, the force component of the bearing force (12) oriented perpendicular to the measurement direction (11) is, in contrast, not detected at the technical measurement level. In special installation situations, it may certainly occur that the measurement direction (11) is the same as the force component oriented perpendicularly to the bearing force (12). However, this occurs only in very special installation situations. However, generally, it is assumed that a force component other than the desired force component of the bearing force (12) is measured. FIG. 1 illustrates a tension roller (4) at a first end position where the setting support (7) is pivoted by +α. FIG. 2 illustrates a tension roller (4) at a second end position where the setting support (7) is pivoted by -α. These end positions define end points (13, 14) of the adjustment path (6). Between the end positions, in the middle, there exists a working point (P) spaced apart from the center point (M) of the pivot movement. Additionally, a controller (15) is shown for detecting measurement signals from a sensor (37) for detecting the position of a force measuring device (10) and a tension roller (4). The controller (15) returns a correction value to a setting device (16) to enable adjustment of the te