Adjustment device for a carding gap and method for said adjustment device

Abstract

The present invention relates to an adjustment device (100) for a carding gap (212) between the clothing of a revolving flat (211) and the clothing of a cylinder (221). The device (100) comprises a sensor unit (110), an evaluation unit (120) and a control unit (130). The sensor unit (110, 111, 112, 116, 117) senses (510) the temperature or the temperature change at the carding gap (212), at a pre-carding zone (260), at a post-carding zone (270), and / or at a cylinder (220). The evaluation unit (120) calculates (570) the deformation of the flat bar (213) and / or of the cylinder (220), and the control unit (130) adjusts (590) the carding gap (212) between the clothing of the revolving flat (211) and the clothing of the cylinder (221) on the basis of measurement signals corresponding to the measured temperature and on the basis of the calculation (570).

Description

[0001] Adjustment device of a carding gap and its method

[0002] Technical area

[0003] The present invention relates to an adjusting device of a carding gap for a card and its method for adjusting a carding gap.

[0004] Technological background

[0005] In a carding machine, the revolving flat area, together with the cylinder, forms the main carding zone. Its functions are to break down the fiber flakes into individual fibers, separate impurities and dust, eliminate very short fibers, break up neps, and parallelize the fibers. Depending on the carding application, fixed flats, revolving flats, or a mixture of fixed and revolving flats are used. A narrow gap, known as the carding gap, can form between the clothing of the revolving flats, which may include needle points, and the clothing of the cylinder, which includes at least one sawtooth. This gap is created when revolving flats are used because the revolving flats are guided by curved bars, so-called flexible bends, regulating bends, flex bends, or sliding bends, along the circumference of the cylinder at a distance determined by these bars.The size of the carding gap on a revolving flat card can typically range from 0.10 to 0.30 mm for cotton or up to 0.40 mm for man-made fibers. However, contact between the opposing elements should be avoided, as this can regularly lead to damage to the revolving flats and the cylinder. Therefore, determining the actual carding gap is of great importance.

[0006] In order to achieve the most efficient carding effect in a card, it is necessary to keep the carding gap as small as possible, especially in the main carding zone between the clothing of the revolving flat and the clothing of the cylinder. The clothing of the cylinder is applied to the outer surface of the card's cylinder using special mounting and fastening processes. To achieve high production volumes, the speeds of the cylinders have increased steadily in recent years. This means that cylinders with speeds of over 600 revolutions per minute are now used. By increasing the speed, the centrifugal forces on the card's cylinder are increased, which cause uneven elastic deformations in the diameter area of ​​the card's cylinder due to the uneven tensions that occur.

[0007] Furthermore, heat builds up over time for various reasons. This heat buildup naturally leads to heating of the components and also to deformation of the components, in particular to deformation of the revolving flat and / or the cylinder, and consequently to a change in the carding gap.

[0008] Currently, there are various solutions that adjust the carding gap depending on the temperature, i.e., reduce or increase the gap based on data. For example, there are solutions that propose measuring the temperature of the cylinder and / or the flat bars. Because the flat is moved out of the carding zone and the drum rotates, no continuous measurement is performed at the point with the highest temperature.

[0009] Furthermore, the cylinder and flat bar can actually be made of different materials and have different shapes and properties. This results in different thermal inertias of the components, and the carding gap set in the idle state can change during operation.

[0010] Furthermore, it has been shown that temperatures tend to be higher on the carding side with the drum drive than at other locations, which is not taken into account in current solutions. This leads to a deterioration in carding due to loss of carding area, as well as to collisions between the carding clothings and thus to damage to the carding clothings. Summary of the invention

[0011] The object of the present invention is to provide an adjustment device for a carding gap which does not have all or part of the disadvantages of the known prior art and which detects a continuous temperature measurement at the point with the highest temperature.

[0012] The object is achieved in whole or in part by the features of the invention. To achieve this object, a device for adjusting a carding gap between the clothing of a flat bar of a revolving flat and the clothing of a cylinder is proposed. The device comprises:

[0013] - a sensor unit; wherein the sensor unit is configured to detect a measurement signal as a measure of the temperature or temperature change of the pre-carding zone, the post-carding zone, and / or the reel;

[0014] - an evaluation unit; wherein the evaluation unit is configured to calculate the deformation of the flat bar and / or the drum based on measurement signals corresponding to the measured temperature; and,

[0015] - a control unit; wherein the control unit is configured to adjust the carding gap between the clothing of the revolving flat and the clothing of the cylinder.

[0016] Advantageously, thanks to several distributed temperature sensors, the device can continuously measure the temperature or temperature change on the card side and at other locations. Based on the measured temperatures combined with a calculation model, the evaluation unit calculates the deformation of the flat bar and / or the cylinder. The calculation model can include, among other things, a temperature model that can take into account the ambient temperature and / or the various heat sources, such as a drum drive mounted on one side or the ventilation motors. Furthermore, it is advantageous if the temperatures are measured statically and continuously, as this can minimize measurement errors. The temperature sensors are stationary, which reduces measurement errors and the measured data and simultaneously increases calculation speed.

[0017] According to one embodiment, the sensor unit comprises at least one cover inlet temperature sensor, at least one cover gap sensor, at least one pre-carding zone temperature sensor, at least one post-carding zone temperature sensor, and / or at least one reel temperature sensor.

[0018] It is advantageous to perform a static measurement of the temperature or temperature changes at different points on the card. It is also advantageous to measure the temperatures statically and continuously, as this creates a better temperature profile.

[0019] According to one embodiment, the at least one flat inlet temperature sensor is arranged between the clothing of the revolving flat, the clothing of the drum and the post-carding zone, or between the clothing of the revolving flat, the clothing of the drum and in the region of the post-carding zone.

[0020] Advantageously, the flat infeed temperature sensor can record the temperature of the drum and / or measure the temperature of the carding gap between the clothing of a revolving flat and the clothing of a cylinder. The flat infeed, also called lid infeed, is a guide element or fiber web guide that serves as a transition from the carding surface flat to the carding surface post-carding zone. Due to its proximity to the carding gap, the flat infeed temperature sensor can continuously measure the temperature of the rotating cylinder and / or the moving flat bars.

[0021] According to one embodiment, the evaluation unit is configured to transmit the setting value between the clothing of the revolving flat and the clothing of the drum to the control unit.

[0022] Advantageously, the carding gap can be adjusted by the control unit, thanks to the setting value calculated by the evaluation unit. Static and continuous temperature measurement minimizes measurement errors, allowing the evaluation unit to quickly calculate the setting value.

[0023] The object is achieved in whole or in part by the features of the invention. To achieve this object, a carding machine is proposed, among other things. The carding machine comprises a revolving flat, a cylinder, a pre-carding zone, a main carding zone, a post-carding zone, and an adjustment device according to one embodiment of the invention.

[0024] Advantageously, the carding machine can continuously measure the temperature or temperature changes thanks to several distributed temperature sensors. Based on the measured temperature combined with a calculation model, the carding machine can keep the carding gap small or adjust it to achieve the most efficient carding effect. The calculation model can include, among other things, a temperature model that can take into account the ambient temperature and / or the various heat sources. Furthermore, it is advantageous if the temperatures are measured statically and continuously, as this can minimize measurement errors. The temperature sensors are stationary, which reduces measurement errors and the measured data while simultaneously increasing the computing speed of the evaluation unit or control unit.

[0025] The object is achieved in whole or in part by the features of the invention. To achieve the object, a carding machine and a sensor unit for a carding nip are proposed, among other things. The sensor unit for a carding nip is configured to detect a measurement signal as a measure of the temperature or temperature change in the carding nip and is designed to be used in a carding machine. The sensor unit can preferably comprise a flat inlet temperature sensor, at least one flat gap sensor, at least one pre-carding zone temperature sensor, at least one post-carding zone temperature sensor, and / or at least one reel temperature sensor. In particular, the sensor unit for a carding nip is the at least one flat inlet temperature sensor, which is arranged between the clothing of the revolving flat, the clothing of the reel, and the post-carding zone.The carding machine comprises a revolving flat, a cylinder, a pre-carding zone, a main carding zone, a post-carding zone, and an adjustment device. The adjustment device comprises:

[0026] - an evaluation unit; wherein the evaluation unit is configured to receive the measurement signal of the sensor unit and thereby calculate the deformation of the flat bar and / or the drum; and,

[0027] - a control unit; wherein the control unit is configured to adjust the carding gap between the clothing of the revolving flat and the clothing of the cylinder.

[0028] Advantageously, thanks to the insertable sensor unit, the device can continuously measure the temperature or the temperature change on the card side and at other points. Based on the measured temperatures combined with a calculation model, the evaluation unit calculates the deformation of the flat bar and / or the cylinder. The calculation model can include, among other things, a temperature model that can take into account the ambient temperature and / or the various heat sources, such as a drum drive attached to one side or the ventilation motors. Furthermore, it is advantageous if the temperatures are measured statically and continuously, because this can minimize measurement errors. The temperature sensors are stationary, which reduces measurement errors and the measured data and at the same time increases the calculation speed. Thanks to one aspect of the invention, the sensor unit is replaceable and / or interchangeable.

[0029] The object is achieved in whole or in part by the features of the invention. To achieve the object, a method for adjusting a carding gap, particularly in the main carding zone, between the clothing of the revolving flat and the clothing of the cylinder is proposed. The method comprises:

[0030] - Detecting the temperature or temperature change at the carding gap, the pre-carding zone, the post-carding zone, and / or the reel by means of a sensor unit comprising at least one temperature sensor; - Generating corresponding measurement signals corresponding to the temperature or temperature change of the carding gap, the pre-carding zone, the post-carding zone, and / or the reel, and transmitting the measurement signals to an evaluation unit;

[0031] - Calculation of the deformation of the flat bar and / or the drum by means of a calculation model of the evaluation unit; and,

[0032] - Adjustment of the carding gap using a control unit based on the calculation.

[0033] The process can advantageously adjust the carding gap in order to achieve the most efficient carding effect. The temperature measurements or the temperature change can be measured continuously on the card side and / or at other locations thanks to several distributed temperature sensors. Based on the measured temperature combined with a calculation model, the evaluation unit calculates the deformation of the flat bar and / or the reel cylinder. The calculation model can include, among other things, a temperature model that can take into account the interior temperature, the ambient temperature, and / or the various heat sources, such as a drum drive mounted on one side or the ventilation motors. Furthermore, it is advantageous if the temperatures are measured statically and continuously, as this can minimize measurement errors. The temperature sensors are stationary, which reduces measurement errors and the measured data and at the same time increases the calculation speed.

[0034] According to one embodiment, the method comprises a preparation step during which a reference distance between the clothing of the revolving flat and the clothing of the drum is measured or entered before operation of the spinning preparation machine and / or at room temperature.

[0035] Advantageously, the carding gap, in particular the gap between the clothing of the revolving flat and the clothing of the cylinder, can be measured or entered before operation of the spinning preparation machine and / or at room temperature. This allows the setting values ​​calculated by the evaluation unit to be classified, providing the evaluation unit with guidance and / or ensuring that the changes in the carding gap and / or the parameters during operation correspond to the calculation model.

[0036] According to one embodiment, the calculation comprises inferring the deformation of the flat bar and / or the drum based on the temperature measured by the sensor unit.

[0037] Advantageously, the evaluation unit and its calculation model can calculate the deformation of the flat bar as a function of time, static temperature measurements or temperature changes, and / or other parameters without measuring the deformation of the flat bar and / or the cylinder. Thanks to the static and continuous temperature measurement, measurement errors can be minimized, allowing the evaluation unit and its calculation model to calculate the deformation of the flat bar and / or the cylinder more precisely.

[0038] According to one embodiment, the calculation comprises a determination of the deviation of the carding gap from the reference distance, preferably a determination of the change in the distance between the clothing of the revolving flat and the clothing of the drum.

[0039] Advantageously, the calculation model can determine the change in the distance between the clothing of the revolving flat and the clothing of the drum with a small error tolerance based on the static temperature measurements.

[0040] According to one embodiment, the determination of the deviation comprises an evaluation of the determination to decide on the adjustment.

[0041] Advantageously, the evaluation unit and its calculation model can methodically store and systematically document the measurement data and / or the temperature measurements to enable investigation, verify the procedure, and / or understand the adjustment decision. According to one embodiment, the calculation uses the measurement signals to calculate a setting value for the distance between the clothing of the revolving flat and the clothing of the cylinder drum.

[0042] Advantageously, the calculation can calculate the setting value with a small tolerance based on the static and continuous temperature measurements.

[0043] According to one embodiment, the evaluation unit transmits the setting value between the clothing of the revolving flat and the clothing of the drum to the control unit.

[0044] According to one embodiment, the adaptation comprises a movement control of the revolving lid by the control unit.

[0045] Thanks to one of the above configurations, the evaluation unit can be separated from the control unit to reduce measurement errors and / or increase calculation speed. This separation can also be advantageous, allowing the control unit to control the revolving lid while the evaluation unit calculates the setting value.

[0046] According to one embodiment, the calculation comprises an update of the calculation model, during which the calculation model, preferably at least one formula, and / or at least one rule of the calculation model, is changed.

[0047] Advantageously, the calculation model can be updated and / or enriched with the stored and systematically documented measurement data and / or the temperature measurements.

[0048] Description of the characters

[0049] The above and other objects, features, aspects and advantages of the invention will become apparent from the following detailed description of the embodiments, which are given by way of illustration and not by way of limitation with reference to the accompanying drawings, in which

[0050] - Figure 1 illustrates a schematic representation of an adaptation device 100 according to an embodiment of the invention and a view of a carding machine 200 according to an embodiment of the invention; and,

[0051] - Figure 2 presents a schematic representation of a method 500 according to an embodiment of the invention.

[0052] In the following description of the illustrated embodiments, the same reference numerals are used for features that are identical and / or at least comparable in their design and / or mode of operation, even if they are shown in different embodiments. Unless explained again in detail, their design and / or mode of operation corresponds to the design and mode of operation of the features already described above.

[0053] Description of an embodiment

[0054] The distances between the cylinder clothing and the surfaces opposite it are of considerable importance in terms of machine and fiber technology. The carding result, namely cleaning, neps formation and fiber shortening, depends significantly on the carding gap, i.e. the distance between the clothing of a cylinder, also called cylinder clothing, and the clothing of the revolving and fixed flats. The air flow around the cylinder, i.e. the cylinder, and heat dissipation are also dependent on the distance between the cylinder clothing and opposite clothed or non-clothed surfaces, e.g. separating knives or casing elements. The distances are subject to various influences, some of which are opposing. The wear of opposing clothing leads to heating and / or an enlargement of the carding gap, which is associated with an increase in the number of neps and a decrease in fiber shortening.Carding involves processing increasingly larger quantities of fiber material per unit of time, requiring higher speeds of the working units and higher installed power. Even with a constant working area, increasing production leads to increased heat generation due to the mechanical work. Furthermore, the proportion of man-made fibers and / or cotton being processed can generate more heat due to frictional contact with the working surfaces of the machine.

[0055] The aforementioned circumstances can significantly increase the heat input into the machine. The resulting increased heating of high-performance cards can lead to significant thermoelastic deformations, which, due to the uneven distribution of the temperature field, affect the set distances between the working surfaces: the distances between the drum and flats, doffers, fixed flats, and separation points can change. In extreme cases, the set gap between the working surfaces can be completely consumed by thermal expansion, causing relatively moving components to collide. In particular, the generation of heat in the working area of ​​the card can lead to varying thermal expansions if the temperature differences between the components are too large.

[0056] Furthermore, to increase carding machine production, attempts are made to select the operating speed or the operating speed of the moving elements as high as possible. Increasing the drum speed, e.g., to increase the cleaning effect, can lead to an increase in temperature. Furthermore, the most important carding gap of the revolving flat card can be located in the main carding zone, i.e., between the cylinder and the revolving flat, because temperatures tend to be higher on the carding side with the drum drive than at other locations. Therefore, it is important to record a static and continuous temperature measurement at the location with the highest temperature, as proposed by the present invention.

[0057] Figure 1 shows a carding machine 200, the subject of the present invention, which may include an adaptation device 100, also the subject of the present invention. The device 100 may include a sensor unit 110, an evaluation unit 120, and a control unit 130. According to one embodiment, the sensor unit 110 may be a replaceable component. It is entirely conceivable that the sensor unit 110 could be replaced in order to have more or fewer sensors, for example, due to precision.

[0058] The sensor unit 110 can comprise at least one flat inlet temperature sensor 111, at least one flat gap sensor 115, at least one pre-carding zone temperature sensor 116, at least one post-carding zone temperature sensor 117, and / or at least one cylinder temperature sensor 112. As shown in Figure 1, the at least one flat gap sensor 115 can be located in the flat gap between the flat bars of the flats. The at least one pre-carding zone and / or post-carding zone temperature sensor 116, 117 can be located on the carding bar or in the carding bar of the pre-carding zone and / or post-carding zone. Finally, the cylinder temperature sensor 112 can be located on the cylinder shield, on the wall, and / or on a cylinder stand, as shown in Figure 1.

[0059] Thanks to the temperature sensor 111, 112, 115, 116, 117 or the temperature sensors 111, 112, 115, 116, 117, a static and continuous measurement of the temperature or temperature change can be performed at different locations on the carding machine, thus creating a better temperature image. It is indeed advantageous if the temperature can be measured statically and continuously because measurement errors and the measurement data can be reduced. In other words, the temperature sensors are stationary and can only measure the temperature from this location, which is not the case if the temperature sensors are arranged on a moving part or component. If the part or component moves, the temperature sensor will measure the temperature along the path of the moving part or component, thus increasing the amount of measurement data.Furthermore, if only a portion of the measurements is relevant, measurement data must be sorted out, which can lead to increasing measurement errors. Whereas a static and continuously measured temperature reduces measurement errors and the measurement data. This is all the more important when the most important carding gap of the revolving flat card can be located in the main carding zone, i.e. between a rotating cylinder and a movable revolving flat. Thanks to a sensor unit 110, 111, in particular the at least one cylinder inlet temperature sensor 111, the temperature of the carding gap 212 between the clothing of a revolving flat 211 and the clothing of a cylinder 221 can be measured. As shown in Fig. 1, the cylinder inlet, also called lid infeed, is a guide element or a fiber web guide that serves as a transition from the carding surface cylinder to the carding surface post-carding zone.In other words, the at least one flat inlet temperature sensor 111 can be arranged between the clothing of the revolving flat 211, the clothing of the cylinder 221, and the post-carding zone 270. Due to its spatial proximity to the carding gap 212, the flat inlet temperature sensor 111 can therefore measure a continuous temperature of the carding gap 212, despite the rotating cylinder and the movable flat bars. The same also applies to at least one flat inlet temperature sensor 111 (not shown) that could be arranged between the clothing of the revolving flat 211, the clothing of the cylinder 221, and the pre-carding zone 260.

[0060] Furthermore, the sensor unit 110 is configured to detect 510 a measurement signal as a measure of the temperature or temperature change of the pre-carding zone 260, the post-carding zone 270, and / or the reel 220. This measurement signal can be received by the evaluation unit 120, and it, ie the evaluation unit 120, can calculate 570 the deformation of the flat bar 213 and / or the reel 220, thanks to a method 500 for adapting 590 the carding gap 212, based on measurement signals corresponding to the measured temperature.

[0061] The method 500 shown in Fig. 2 comprises detecting 510 the temperature at the carding gap 212, at the pre-carding zone 260, at the post-carding zone 270, and / or at the reel 220 by means of the sensor unit 110. The corresponding measurement signals can be generated 530, which correspond to the temperature or temperature change of the carding gap 212, the pre-carding zone 260, the post-carding zone 270, and / or the reel 220. The measurement signals can then be transmitted 550 to the evaluation unit 120.

[0062] Using a calculation model 572, the evaluation unit 120 can calculate 570 the deformation of the flat bar 213 and / or the cylinder 220. This calculation 570 can calculate 570 a setting value 579 of the distance between the clothing of the revolving flat 211 and the clothing of the cylinder 221 from measurement signals using the calculation model 572 with a small tolerance based on the static and continuous temperature measurements. Finally, the setting value 579 is transmitted from the evaluation unit 120 to the control unit 130.

[0063] The calculation model 572 can be stored in the evaluation unit 120, in the control unit 130 if the control unit 130 is the evaluation unit 120, or stored on a remote cloud server. This calculation 570 can calculate an inference 573 about the deformation of the flat bar 213 and / or the drum 220 from the temperature measured by the sensor unit. The evaluation unit 120 and its calculation model 572 can actually calculate the deformation of the flat bar 213 as a function of time, the static temperature measurements or the temperature change, and / or other parameters, without having to measure the deformation of the flat bar 213 and / or the drum 220. Furthermore, the static and continuous temperature measurements can minimize the measurement errors, and at the same time the evaluation unit 120 and its calculation model 572 can calculate the deformation of the flat bar 213 more precisely.

[0064] The aforementioned deformation can lead to a deviation of the carding gap 212 from a reference distance 501. This reference distance 501 can represent the distance between the clothing of the revolving flat 211 and the clothing of the cylinder 221 before operation of the spinning preparation machine 200, and / or at room temperature. During a preparation step 505, the reference distance 501 can be measured or entered. In this way, the setting values ​​579 calculated by the evaluation unit 120 can be classified, and thus the evaluation unit 120 can have an orientation and / or ensure whether the change in the carding gap 212 and / or the parameters during operation agree with the calculation model 572.

[0065] As mentioned above, the evaluation unit 120 can transmit the setting value 579 to the control unit 130. The control unit 130, in turn, can adjust 590 the carding gap 212 between the clothing of the revolving flat 211 and the clothing of the cylinder 221 thanks to a motion control 595 for the revolving flat.

[0066] This deviation of the carding gap 212 from the reference distance 501, preferably the change in the distance between the clothing of the revolving flat 211 and the clothing of the cylinder 221, can be determined 575 by the calculation model 572 with a low error tolerance based on the static temperature measurements. The evaluation unit 120 and its calculation model 572 can methodically store and systematically document the measurement data and / or the temperature measurements to enable an investigation, to verify the procedure, and / or to understand the decision for the adjustment 590. For this purpose, this determination 575 of the deviation can serve as an evaluation 577 of the determination.

[0067] After a certain time, and / or at certain amounts of stored and systematically documented measurement data, the calculation 570 can initiate an update 574 of the calculation model 572, during which the calculation model 572, preferably at least one formula, and / or at least one rule of the calculation model 572, is changed and / or enriched.

[0068] As can be understood, the method can adjust the carding gap 212 to achieve the most efficient carding effect. The temperature measurements or the temperature change can be measured continuously on the card side and / or at other locations thanks to several distributed temperature sensors. Based on the measured temperature combined with a calculation model, the evaluation unit 120 calculates the deformation of the flat bar 213 and / or the cylinder 220. The calculation model can include, among other things, a temperature model that can take into account the interior temperature, the ambient temperature, and / or the various heat sources, such as a drum drive mounted on one side or the ventilation motors. Furthermore, it is advantageous if the temperatures are measured statically and continuously, as this can minimize measurement errors.The temperature sensors are stationary, which reduces measurement errors and measurement data while increasing computing speed.

Claims

Patent claims 1. Adjustment device (100) of a carding gap (212) between the clothing of a flat bar (213) of a revolving flat (211) and the clothing of a cylinder (221), the device (100) comprising: - a sensor unit (110); wherein the sensor unit (110) is configured to detect (510) a measurement signal as a measure of the temperature or temperature change of the pre-carding zone (260), the post-carding zone (270), and / or the reel (220); - an evaluation unit (120); wherein the evaluation unit (120) is configured to calculate (570) the deformation of the flat bar (213) and / or the drum (220) based on measurement signals corresponding to the measured temperature; and, - a control unit (130); wherein the control unit (130) is configured to adjust (590) the carding gap (212) between the clothing of the revolving flat (211) and the clothing of the cylinder (221).

2. Device (100) according to claim 1, wherein the sensor unit (110) comprises at least one cover inlet temperature sensor (111), at least one pre-carding zone temperature sensor (116), at least one post-carding zone temperature sensor (117), and / or at least one reel temperature sensor (112).

3. Device (100) according to claim 2, wherein the at least one cover inlet temperature sensor (111) is arranged between the clothing of the revolving cover (211), the clothing of the drum (221) and the post-carding zone (270).

4. Device (100) according to any one of claims 1 to 3, wherein the evaluation unit (120) is configured to transmit the setting value (579) between the clothing of the revolving flat (211) and the clothing of the drum (221) to the control unit (130). Carding machine (200) comprising a revolving flat (211), a cylinder (221), a pre-carding zone (260), a main carding zone (230), a post-carding zone (270) and an adjustment device (100) according to any one of claims 1 to 4. Method (500) for adjusting (590) a carding gap (212), in particular in the main carding zone (230), between the clothing of a flat bar (213) of a revolving flat (211) and the clothing of the cylinder (221), wherein the method (500) comprises at least the following steps: - detecting (510) the temperature or the temperature change at the carding gap (212), at the pre-carding zone (260), at the post-carding zone (270), and / or at the reel (220) by means of a sensor unit (110) comprising at least one temperature sensor (111, 112, 116, 117); - generating (530) corresponding measurement signals corresponding to the temperature or temperature change of the carding gap (212), the pre-carding zone (260), the post-carding zone (270), and / or the reel (220) and transmitting (550) the measurement signals to an evaluation unit (120); - Calculation (570) of the deformation of the flat bar (213) and / or the drum (220) by means of a calculation model (572) of the evaluation unit (120); and, - Adjusting (590) the carding gap (212) by means of a control unit (130) based on the calculation (570). The method (500) according to claim 6, comprising a preparation step (505) during which a reference distance (501) between the clothing of the revolving flat (211) and the clothing of the cylinder (221) is measured or input before operation of the spinning preparation machine (200) and / or at room temperature. Method (500) according to claim 6 or 7, wherein the calculation (570) comprises inferring (573) the deformation of the flat bar (213) and / or the cylinder (220) based on the temperature measured by the sensor unit (110). Method (500) according to any one of claims 6 to 8, wherein the calculation (570) comprises determining (575) the deviation of the carding gap (212) from the reference distance (501), preferably determining (575) the change in the distance between the clothing of the revolving flat (211) and the clothing of the cylinder (221). Method (500) according to claim 9, wherein the determination (575) of the deviation comprises evaluating (577) the determination to decide on the adjustment (590).Method (500) according to any one of claims 6 to 10, wherein the calculation (570) calculates a setting value (579) of the distance between the clothing of the revolving flat (211) and the clothing of the cylinder (221) from measurement signals using the calculation model (572). Method (500) according to claim 11, wherein the evaluation unit (120) transmits the setting value (579) between the clothing of the revolving flat (211) and the clothing of the cylinder (221) to the control unit (130). Method (500) according to any one of claims 6 to 12, wherein the adjustment (590) comprises a movement control (595) of the revolving flat by the control unit (130). Method (500) according to any one of claims 5 to 12, wherein the calculation (570) comprises an update (574) of the calculation model (572), during which the calculation model (572), preferably at least one formula, and / or at least one rule of the calculation model (572), is changed.

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