CN213956318U - Thickness detection component, device and system - Google Patents

Abstract

The application provides a thickness detection component, a device and a system. The thickness detection part comprises a shell, and a track ball, a contact wheel, a linear displacement sensor, an elastic piece and a support which are contained in the shell. The thickness detection apparatus includes a thickness detection part. The thickness control system comprises a thickness detection device, a control unit and a calender. The application provides a thickness detection part, equipment and system can be on-line accurate detect the thickness of testee.

Description

Thickness detection component, device and system

Technical Field

The present application relates to the field of thickness detection, and in particular, to a thickness detection component, apparatus and system.

Background

The tobacco leaves reproduced by a wet paper-making method, the tobacco leaves reproduced by a dry paper-making method, the tobacco leaves reproduced by a thick pulp paper-making method and the tobacco leaves reproduced by a rolling paper-making method are used as the heating non-combustion tobacco core materials, and the filling problem of corresponding materials is faced when the tobacco leaves are used for producing and preparing ordered heating non-combustion cigarettes. The problems can be effectively solved by setting a proper tobacco core material and airflow channel ratio, and the tobacco leaves reproduced by a wet paper-making method, the tobacco leaves reproduced by a dry paper-making method, the tobacco leaves reproduced by a thick pulp paper-making method and the tobacco leaves reproduced by a rolling paper-making method need to have relatively stable thickness.

Conventional on-line detection is classified into contact and non-contact. The contact type needs to use a probe to contact the paper surface, but the surface of the reconstituted tobacco product is very rough, so that the reconstituted tobacco product is easily scratched by the probe to cause difficulty in production and subsequent processing. The chemical component composition of the reconstituted tobacco is more complex than that of common paper and has poorer stability, and relatively strict test conditions exist in a non-contact thickness test, so that the existing non-contact thickness test equipment is not suitable for on-line detection of the thickness of the reconstituted tobacco.

The current manual adjustment mode for online sampling and offline detection has the following problems: 1. the feedback time is long, and the adjustment lag depends on the experience of an operator; 2. on-line sampling can destroy the integrity of paper webs and has negative influence on subsequent curling and rewinding slitting.

In view of this, the present application is specifically made.

SUMMERY OF THE UTILITY MODEL

It is an object of the present application to provide a thickness detection component, apparatus and system to address the above problems.

In order to achieve the purpose, the following technical scheme is adopted in the application:

a thickness detection component comprises a detection head, wherein the detection head comprises a shell, and a track ball, a contact wheel, a linear displacement sensor, an elastic piece and a support which are accommodated in the shell;

the casing is provided with a matching hole used for being matched with the track ball, the contact wheel is abutted to the upper half part of the track ball, the fixed end of the linear displacement sensor is connected with the contact wheel through a fixed connecting rod, the measuring end of the linear displacement sensor is connected with the support, and an elastic piece used for resetting the linear displacement sensor is arranged between the linear displacement sensor and the support; the bracket is connected with the housing.

Preferably, the support is provided with a movable connecting rod, the shell is provided with a movable sleeve, and the movable sleeve is sleeved on the movable connecting rod.

The arrangement of the movable sleeve and the movable connecting rod mainly ensures that the combination formed by the contact wheel, the fixed connecting rod and the linear displacement sensor only generates longitudinal displacement and does not generate transverse displacement in the measuring process.

Preferably, the thickness detection part further comprises a telescopic rod and a pressure sensor;

one end of the telescopic rod is connected with the bracket, and the other end of the telescopic rod is connected with the pressure sensor;

the cover is equipped with compression spring and is used for adjusting on the telescopic link compression spring length with the pressure adjustment nut of telescopic link length, compression spring with pressure adjustment nut contradicts and is connected.

The pressure sensor is arranged for the purpose of ensuring that the pressure between the thickness control detection part and the detected object during detection can meet the detection standard and ensuring the detection and measurement accuracy; on the other hand, the pressure between the thickness detection part and the measured object is adjusted to meet the requirements of measuring the thicknesses of different kinds of measured objects.

Preferably, the contact wheel, the fixed connecting rod and the linear displacement sensor are provided with a plurality of groups;

preferably, the contact wheel, the fixed connecting rod and the linear displacement sensor are provided with three groups;

the multiunit sets up on the one hand and can improves measurement accuracy, and on the other hand can guarantee the stable cooperation between the combination that contact wheel, fixed link and linear displacement sensor formed and the trackball.

Preferably, an included angle between each group of the contact wheel, the fixed connecting rod and the linear displacement sensor is 120 degrees;

preferably, the accuracy of the linear displacement sensor is not lower than 0.01 mm;

preferably, the diameter of the contact wheel has the processing precision not lower than +/-0.001 mm and the roundness not lower than +/-0.001 mm;

preferably, the contact wheel is made of plastic;

preferably, the track ball is a solid silicone rubber ball or a metal-coated silicone rubber ball;

preferably, the weight precision of the track ball is not less than +/-0.001 g, and the roundness is not less than +/-0.001 mm;

preferably, the detection range of the thickness detection part is 0-0.500mm, and the precision is not less than +/-0.001 mm.

A thickness detection device comprises the thickness detection component.

Preferably, the thickness detection device further comprises a support frame for fixing the thickness detection component and a detection platform for bearing a measured object.

It should be noted that, besides being used for bearing the object to be measured, the detection platform also provides an initial position for the thickness detection component.

A thickness control system comprises the thickness detection device, a control unit and a calender;

the control unit is electrically connected with the thickness detection device and the calender.

Preferably, the calender comprises a movable roller, a fixed roller and a control cylinder for adjusting the distance between the movable roller and the fixed roller, and the control unit is electrically connected with the control cylinder;

preferably, the control unit is a DCS unit.

Compared with the prior art, the beneficial effect of this application includes:

according to the thickness detection part and the thickness detection equipment, the thickness change of the measured object can be quickly converted into displacement in real time through the contact of the track ball in the arranged shell and the measured object, the displacement change is transmitted to the linear displacement sensor connected with the support through the contact wheel abutting against the linear displacement sensor, and the linear displacement sensor accurately measures the displacement value; meanwhile, under the action of the elastic piece, the linear displacement sensor can be quickly and automatically reset after the thickness of the measured object is reduced, so that continuous detection is realized; the thickness detection part is in indirect contact, the linear displacement sensor is not in direct contact with the measured object, and the surface of the measured object is prevented from being damaged by the trackball;

the thickness control system that this application provided, through the thickness data of thickness check out test set real-time on-line measuring measured object, then the control unit controls the plating press according to the testing result and adjusts the measured object thickness to realize on-line real time control measured object thickness.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments are briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope of the present application.

Fig. 1 is a schematic view of a thickness detection member a provided in example 1;

FIG. 2 is a top view of the trackball and contact wheel provided in example 1;

fig. 3 is a bottom view of the housing, the trackball and the contact wheel provided in embodiment 1;

fig. 4 is a schematic view of a thickness detecting apparatus provided in example 1;

fig. 5 is a schematic view of a thickness control system provided in embodiment 2.

Reference numerals:

a-a thickness detection component; b, a support frame; c, detecting a platform; d-thickness detection equipment; e-a control unit;

1-a shell; 10-a mating hole; 11-moving the sleeve;

2-a trackball;

3-a contact wheel;

4-a linear displacement sensor; 40-a fixed end; 41-fixed connecting rod; 42-a measuring end;

5-an elastic member;

6-a scaffold; 60-moving the connecting rod;

7-a telescopic rod; 70-compression spring; 71-a pressure adjusting nut;

8-a pressure sensor;

90-moving rollers; 91-fixing a roller; 92-control cylinder.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Embodiments of the present application will be described in detail below with reference to specific examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present application and should not be construed as limiting the scope of the present application. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

Example 1

As shown in fig. 1, the present embodiment provides a thickness detection part a, including a housing 1, a trackball 2, a contact wheel 3, a linear displacement sensor 4, an elastic member 5, and a bracket 6; the track ball 2, the contact wheel 3, the linear displacement sensor 4, the elastic piece 5 and the bracket 6 are all arranged in the shell 1.

The bottom of the shell 1 is provided with a matching hole 10 matched with the track ball 2, and the diameter of the matching hole 10 is smaller than that of the track ball 2. The trackball 2 can be selected to be a solid silicone rubber ball or a metal-coated silicone rubber ball, or other suitable materials according to actual needs. The weight precision of the track ball 2 is not less than +/-0.001 g, and the roundness is not less than +/-0.001 mm.

The contact wheel 3 is abutted against the upper half part of the track ball 2, the fixed end 40 of the linear displacement sensor 4 is connected with the contact wheel 3 through a fixed connecting rod 41, the measuring end 42 of the linear displacement sensor 4 is connected with the support 6, an elastic part 5 for resetting the linear displacement sensor 4 is arranged between the linear displacement sensor 4 and the support 6, and the elastic part 5 is a reset spring; the bracket 6 is connected to the housing 1.

In order to ensure that the contact wheel 3, the linear displacement sensor 4, the elastic member 5 and the support 6 are in a stable state and that the linear displacement sensor 4 is always in a vertical state, in an optional embodiment, the support 6 is provided with a movable connecting rod 60, the housing 1 is provided with a movable sleeve 11, and the movable sleeve 11 is sleeved on the movable connecting rod 60. In a preferred embodiment, the movable connecting rod 60 is provided with two symmetrical rods, which are respectively connected with both ends of the bracket 6.

Since the thickness measurement is related to the pressure between the detection device and the object to be detected, in order to ensure the accuracy of the detection result and simultaneously meet different pressure standards corresponding to different objects to be detected, in an optional embodiment, the thickness measurement part a is further provided with a telescopic rod 7 and a pressure sensor 8, one end of the telescopic rod 7 is connected with the support 6, and the other end of the telescopic rod is connected with the pressure sensor 8; the telescopic rod 7 is sleeved with a compression spring 70 and a pressure adjusting nut 71 used for adjusting the length of the compression spring 70 and the length of the telescopic rod 7, the compression spring 70 is abutted against the pressure adjusting nut 71 and is connected with the pressure adjusting nut 71, the upper end of the compression spring 70 is fixedly connected with the pressure sensor 8, the pressure adjusting nut at the lower end of the compression spring 70 is fixedly connected with the compression spring 70, and the telescopic rod 7 is sleeved with the compression spring 70.

In order to further improve the accuracy and stability, the contact wheel 3, the linear displacement sensor 4, and the elastic member 5 may be provided with a plurality of sets. As shown in fig. 2 and 3, in a preferred embodiment, the contact wheel 3, the linear displacement sensor 4 and the elastic member 5 are provided in 3 sets, and the included angle between each set is 120 degrees.

In order to ensure the measurement precision, the precision of the linear displacement sensor 4 is not lower than 0.01 mm; the diameter of the contact wheel 3 has the processing precision not less than +/-0.001 mm and the roundness not less than +/-0.001 mm; the contact wheel 3 is preferably made of wear-resistant engineering plastics.

The thickness detection component A has a detection range of 0-0.500mm and an accuracy of not less than +/-0.001 mm.

As shown in fig. 4, the embodiment further provides a thickness detection device D, which includes the thickness detection component a, a support frame B for fixing the thickness detection component a, and a detection platform C for bearing a measured object, where the detection platform C is fixedly connected to the support frame B.

The working process of the pressure detection component and the pressure detection system is described in detail as follows:

first, pressure setting is performed.

Trackball 2 was selected to have a shore hardness of 25A, a diameter of 50.000mm and a self weight of 61.500 g. According to the detection standard, the pressure of the contact surface of the track ball 2 and the measured object is 100 KPa.

The pressure regulating nut 71 is regulated to supplement pressure 19.397N, and the contact area of the track ball 2 and the detection platform C is 200mm². The weight of the trackball 2 was 0.603N, the supplementary pressure was 19.397N, the total pressure was 20N, and the contact area was 200mm²And calculating to obtain the pressure intensity of 100KPa, matching with the detection standard and finishing the pressure setting.

The reconstituted tobacco sheet enters and passes through between the track ball and the detection platform under the traction action of a traction device or a rolling device outside the detection platform, the track ball 2 is driven by the sheet to rotate to a certain extent, meanwhile, the track ball 2 is lifted up to move vertically upwards, the displacement distance is transmitted to the linear displacement sensor 4 through the contact wheel 3 and the fixed connecting rod 41, and displacement data are read out.

According to the method, the pressure of the tobacco leaves reproduced by the wet paper-making method, the tobacco leaves reproduced by the dry paper-making method, the tobacco leaves reproduced by the thick pulp paper-making method and the tobacco leaves reproduced by the rolling paper-making method is set, and the data are shown in the following table 1:

TABLE 1 contact area and pressure values corresponding to various reconstituted tobacco

Sample (I)	Contact area mm of trace ball and sample2	Pressure KPa
			Tobacco leaf reproduced by wet paper-making method	206	97.087
Tobacco leaf reproduced by dry paper-making method	208	96.154
			Reconstituted tobacco by thick pulp papermaking method	205	97.561
Tobacco leaf reproduced by rolling paper-making method	203	98.522

The data listed in Table 1 above do not completely meet 100KPa, but still meet the requirements of GB/T451.2-2002 paper and paperboard thickness measurement for pressure of 100 +/-10 KPa.

Under the condition, the thickness of the type 4 reconstituted tobacco is detected by using the thickness detection equipment D, and the data are shown in the following table 2:

TABLE 2 summary of on-line test data

As shown in table 2 above, the thickness detecting device D can effectively detect the thickness of the product on line during operation.

Comparative example 1

In order to prove the advantages of the thickness detection equipment provided by the application, the existing online sampling manual detection method is adopted for comparison, and the method specifically comprises the following steps:

1) after the reconstituted tobacco is rolled down by the thick pulp papermaking method, the large roll is rewound and cut into small rolls with the width of 20cm, and one roll is taken out for detection. The detection mode is as follows: the thickness of 10 samples per meter length is measured by a thickness tester at 5 points, the average value is taken as the thickness of the sample, the total thickness is measured by 200 meters and 2000 samples, and statistics are recorded on the measurement result. The test environment conditions are that the temperature is 22 +/-2 ℃ and the environment humidity is 60 +/-5%.

2) And testing the dry paper-making reconstituted tobacco according to the method, and recording and counting the test result.

3) And testing the reconstituted tobacco by the rolling paper-making method according to the method, and recording and counting the test result.

4) Sampling the reconstituted tobacco by the wet paper-making process by using an online sampling cutter before crushing, taking a sample for about two minutes, carrying out sampling detection by using the same method, and recording and counting test results.

The results of the four groups were counted, and the results are shown in table 3 below.

TABLE 3 summary of offline test results

As shown in the above Table 3, the data of the device is not much different from the data shown in the Table 2, and the device is proved to be capable of meeting the online detection requirement.

The device can realize the online thickness detection of various reconstituted tobaccos, avoid scratching the surfaces of the reconstituted tobaccos, realize the accurate detection of the thickness of the reconstituted tobaccos, and directly transmit the detection result to a computer through a communication line to realize the rapid data acquisition. The thickness can be quickly adjusted on line by matching with corresponding equipment, and the difficulty in subsequent treatment caused by sampling detection is avoided.

Example 2

On the basis of embodiment 1, as shown in fig. 5, the present embodiment provides a thickness control system including the above thickness detecting device D, a control unit E, and a calender; the calender comprises a movable roller 90, a fixed roller 91 and a control cylinder 92 for adjusting the distance between the movable roller 90 and the fixed roller 91, and a control unit E is electrically connected with the control cylinder 92; the control unit E is electrically connected to the thickness detecting device D and the calender.

In a preferred embodiment, the control unit E is a DCS unit. The DCS unit allows for manual setting of sampling frequency and sampling rules.

The method for using the thickness control system comprises the following steps: and the thickness detection equipment D detects the thickness of the reconstituted tobacco, then feeds back the obtained real-time thickness data to the control unit E, and the control unit E responds according to a comparison result after comparing with a set thickness threshold value and controls the thickness of the reconstituted tobacco through a calender.

If the real-time thickness data is larger than the set thickness threshold value, the movable roller 90 is adjusted by controlling the air cylinder 92 to supplement pressure so as to reduce the distance between the movable roller 90 and the fixed roller 91; if the real-time thickness data is smaller than the set thickness threshold value, the pressure is reduced through the control cylinder 92, and the movable roller 90 is adjusted to enlarge the distance between the movable roller 90 and the fixed roller 91; if the real-time thickness data falls between the set thickness thresholds, an instruction does not need to be sent to the control cylinder.

The thickness control of the reconstituted tobacco by the thick pulp papermaking method is taken as an example for explanation:

the thickness of the finished product of the reconstituted tobacco by the thick pulp papermaking method is required to be 0.2mm, the thickness fluctuation is less than 2%, the corresponding data can be calculated when entering a DCS system, and the thickness fluctuation range accepted by the product is 0.196-0.204 mm.

If the thickness detection device D detects that the average thickness is 0.222mm, a signal is fed back to the DCS, the DCS obtains the compensation height of-0.022 mm through calculation, meanwhile, the DCS unit calculates corresponding compensation pressure and movement distance to be obtained according to parameters of the control cylinder 92 and compensation force which needs to be continuously applied to the calender by the control cylinder 92, and the compensation pressure needed by the control cylinder 92 is 0.05MPa (the compensation pressure is equal to the compensation output force needed by the cylinder/the action area of the cylinder). After the corresponding compensation pressure is obtained, the DCS unit instructs the control cylinder 92 to inflate, the movable roller 90 moves towards the fixed roller 91, the roller gap is reduced, the thickness of the reconstituted tobacco is reduced, the average thickness measured by the thickness detection equipment D is 0.202mm, and the requirement is met.

In the production process, the tensioning degree of the paper web of the reconstituted tobacco can be influenced by using different raw materials, different slurry concentrations, production speed and the like, and the tensioning degree has certain influence on the precision of thickness measurement. After stable operation for a period of time, because the thick slurry in the finished product tank is used up, the thick slurry in another finished product tank needs to be replaced, because the concentration of the slurry fluctuates, the average thickness detected by the thickness detection equipment D is 0.188mm, a signal is fed back to the DCS unit, the DCS unit obtains the compensation height of 0.012mm and the compensation pressure of-0.45 Mpa through calculation, the DCS unit indicates the control cylinder 92 to relieve the pressure, the movable roller 90 is far away from the fixed roller 91, the roller gap is increased, and the thickness of the reconstituted tobacco is increased.

Comparative example 2

Unlike example 2, a conventional manual control method was employed.

The manual control method is used for ensuring the integrity of the product, only the head and the tail of the roll are sampled and checked, the waste materials cut off from the transmission side and the operation side are checked in the production process of the product, and the pressure of the air cylinder is adjusted in time.

On the finished rolls produced in the above example 2 and comparative example 2, 2000 samples were taken for thickness measurement, and the measurement results are shown in the following table 4:

TABLE 4 comparison of data

Item	Maximum value	Minimum value	Mean value of	Percent of pass
					Example 2	0.205	0.195	0.201	94％
Comparative example 2	0.207	0.189	0.204	82％

As shown in the table 4, by adopting the control method provided by the application, the thickness of the reconstituted tobacco can be accurately controlled, meanwhile, the damage of online sampling to the integrity of the reconstituted tobacco is avoided, the negative influence on subsequent curling and rewinding is reduced, and the working strength of field workers is also reduced. Meanwhile, the device has certain fault-tolerant capability and eliminates the transverse and longitudinal thickness fluctuation in the production process of products.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Moreover, those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims above, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Claims (10)

1. A thickness detection component is characterized by comprising a shell, a track ball, a contact wheel, a linear displacement sensor, an elastic piece and a support, wherein the track ball, the contact wheel, the linear displacement sensor, the elastic piece and the support are accommodated in the shell;

the casing is provided with a matching hole used for being matched with the track ball, the contact wheel is abutted to the upper half part of the track ball, the fixed end of the linear displacement sensor is connected with the contact wheel through a fixed connecting rod, the measuring end of the linear displacement sensor is connected with the support, and an elastic piece used for resetting the linear displacement sensor is arranged between the linear displacement sensor and the support; the bracket is connected with the housing.

2. The thickness detection member according to claim 1, wherein the holder is provided with a movable connecting rod, and the housing is provided with a movable sleeve that is fitted over the movable connecting rod.

3. The thickness detection member according to claim 2, further comprising a telescopic rod and a pressure sensor;

one end of the telescopic rod is connected with the bracket, and the other end of the telescopic rod is connected with the pressure sensor;

the cover is equipped with compression spring and is used for adjusting on the telescopic link compression spring length with the pressure adjustment nut of telescopic link length, compression spring with pressure adjustment nut contradicts and is connected.

4. The thickness detection member according to claim 1, wherein a plurality of sets of the contact wheel, the fixed link, and the linear displacement sensor are provided.

5. The thickness detection member according to claim 4, wherein the contact wheel, the fixed connection rod, and the linear displacement sensor are provided in three sets, and an included angle between each set of the contact wheel, the fixed connection rod, and the linear displacement sensor is 120 degrees.

6. The thickness detection member of any one of claims 1 to 5, wherein the contact wheel is made of plastic, and the track ball is a solid silicone rubber ball or a metal-coated silicone rubber ball.

7. A thickness detection apparatus characterized by comprising the thickness detection part according to any one of claims 1 to 6.

8. The thickness detection device of claim 7, further comprising a support frame for fixing the thickness detection component and a detection platform for carrying a measured object.

9. A thickness control system, characterized by comprising the thickness detecting device, the control unit and the calender of claim 7 or 8;

the control unit is electrically connected with the thickness detection device and the calender.

10. The thickness control system according to claim 9, wherein the calender includes a movable roll, a fixed roll, and a control cylinder for adjusting a gap between the movable roll and the fixed roll, the control unit being electrically connected to the control cylinder; the control unit is a DCS unit.

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