DE9006418U1 - Setting gauge for measuring the angle of a scraper blade - Google Patents

Description

Applicant:

Joh. Clouth

Lenneper Str. 258 D-5630 Remscheid 11

0829 001 06.6.199U D-L/gust ^ SO/31)

Title·. :;Setting gauge for measuring the angle of a scraper blade

Description

The invention relates to a setting gauge for measuring the angle of attack of a scraper blade.

Such setting gauges are well known. They are used in paper machines to measure the angle of attack, i.e. the angle between the doctor blade and a tangent that runs through the contact point of the doctor blade on a roll of the paper machine.

Such a known setting gauge for measuring the setting angle of a scraper blade consists of a

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one-piece, flat housing in which a circular measuring disc with full circle graduation is housed. A spirit level is arranged on the measuring disc along the circle diameter assigned to the zero point of the full circle graduation. A stop edge of a measuring stop made in the housing runs parallel to the horizontal position of the spirit level. To measure the setting angle of the scraper blade, proceed as follows: The setting gauge is placed on the scraper blade over its measuring stop. The measuring disc is rotated until the spirit level is horizontal. A first angle value is then read off from a mark on the housing. The setting gauge is then placed on the roller in such a way that the mark on the housing is positioned above the contact point of the scraper blade on the roller. The measuring disc is again rotated until the spirit level is horizontal again. The second angle value determined in this way is read off. The angle of attack of the scraper blade to be measured is calculated from the first and second angle values using a table.

This well-known setting gauge has the disadvantage that the angle of attack cannot be read directly from the setting gauge. The calculation of the angle of attack from the first and second angle values also requires a series of complicated considerations: The reading of the first and second angle values

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The angle value is only clear within one quadrant of the 360° range. The operator carrying out the angle measurement is therefore always forced to consider in which first quadrant the scraper blade runs and in which second quadrant the contact point of the scraper blade on the roller is located. The angle values separated by the two map values must then be converted into a common reference system in order to be able to calculate the angle of attack from the first and second angle values listed in the table. The calculation of the angle of attack is also made more difficult in a disadvantageous way by the fact that the orientation of the measuring disc in relation to the longitudinal direction of the roller must be taken into account in order to correctly determine the first and second angle values: two angle values differing by 180' are obtained if the setting gauge is placed on the scraper blade or on the roller from the left or right, as viewed from the longitudinal extension of the roller. This laborious and complex method of measuring the known setting gauge, which requires a lot of thought, is extremely complex and highly susceptible to operating and reading errors.

Another known method for measuring the setting angle of a scraper blade uses a setting gauge set consisting of twelve individual setting gauges. Each individual setting gauge in this set is angle-shaped. The

The individual setting gauges in the set differ in the angle value enclosed by their two legs. To measure the setting angle of a scraper blade, proceed as follows: After the setting angle of the scraper blade has been roughly estimated by the operator, a special setting gauge from the setting gauge set is selected from a table as a function of the roller diameter and the estimated setting angle. This special setting gauge is placed on the roller with one leg. It must be ensured that a mark on the joint of the two legs corresponds to the contact point of the scraper blade on the roller. If the second leg now lies flat on the scraper blade, the setting angle is determined within the desired accuracy. If this is not the case, the setting gauge with the next larger or next smaller angle value is used. This method of measuring the angle of attack, which is based on trial and error, is particularly disadvantageous, cumbersome and time-consuming. In addition, each set of setting gauges is only suitable for a very specific thickness of the scraper blades. In order to measure scraper blades of different thicknesses, several sets of setting gauges must therefore be available, which is costly and therefore disadvantageous. Another disadvantage of such setting gauges is that they can easily be lost.

To avoid these disadvantages, the invention proposes

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The aim is to create a setting gauge for measuring the setting angle of a scraper blade, which allows the setting angle to be read directly . In addition, it should be ensured that the setting gauge according to the invention can be used for scraper blades of any thickness.

The object is achieved in that a housing has a first stop point which is at a fixed first distance from a second stop point of the housing, and in that the first and second stop points are connected by a concave housing edge of the housing, and in that the housing has a recess which is delimited by a stop edge running through the first stop point and by a further edge of the housing, whereby the stop edge of the housing runs orthogonally to a connecting line running through the first and second stop points and after a fixed length merges into the further edge running radially, and in that the housing has two circular grooves arranged concentrically around the first stop point on its front and rear sides, and in that a rotor can be accommodated inside the housing, which is guided pivotably in the circular grooves of the housing via bolts, and in that a measuring arm which can be moved in the radial direction and has a marking is accommodated in the rotor, and in that on at least one side of the Housing several scales with a degree division for direct reading of the angle of attack

are arranged.

The measures according to the invention have the advantage that a direct reading of the setting angle is made possible in a particularly simple manner by a single application and measuring process. One is no longer forced - as with the prior art - to laboriously calculate the setting angle from the first and second angle values obtained in each application process using a table. The measures according to the invention do not just simplify the implementation of the measuring process itself. Rather, the direct reading of the setting angle drastically reduces the susceptibility to errors in the measurement, since no complicated considerations about the orientation of the setting gauge, the course of the scraper blade and the position of the application point on the roller, nor the use of extensive tables are necessary. The compact design of the setting gauge makes it particularly advantageous to carry out the angle measurement quickly and precisely even with a scraper blade that is difficult to access or a roller that is largely covered by the other structural parts of the machine. The ability to move the measuring arm in a radial direction allows the setting angle of scraper blades of different thicknesses to be measured with a single, universally applicable setting gauge.

The setting gauge works mechanically, i.e. it does not require

like known digital display devices, a power supply (battery or similar). It is also small and handy, so that a technician can carry it in his pocket, which is a great advantage given that it is often difficult to access a paper machine.

An advantageous development of the invention provides that

both on the front side and on the rear

Scales for reading the angle of attack are provided on the side surface of the housing.

A further advantageous development of the invention provides that the components of the setting gauge according to the invention are made of heat-resistant material. This measure enables the setting gauge to be used in a particularly advantageous manner with hot rollers and/or scraper blades.

Further advantageous developments of the invention emerge from the subclaims.

Further details of the invention are given in

The example is described below using the drawings. They show:

Fig.Ia-Ic the components of the setting gauge, Figure 2 shows a cross section through the

Embodiment along the line H-II of Figures Ia-Ic,

Figure 3 shows the measuring principle of the setting range.

The embodiment shown in Figures ^1a -1c and - in cross section - in Figure 2 has three essential components: a housing 10 consisting of two identical housing halves 11 and 11' (Figure 1a), a rotor 20 consisting of two identical rotor halves 21 and 21' which is pivotably received in the housing 10 (Figure 1b) and a measuring arm 30 arranged in the rotor so as to be displaceable in the radial direction (Figure 1c). All components of the setting gauge are made of a heat-resistant material so that it is also suitable for use on hot rollers and/or heated scraper blades.

Scraper blade Figure la shows the front housing half 11 of the housing 10. The rear housing half 11' of the housing 10 is structurally completely identical to the front housing half 11. The front (rear) housing half 11 (H') has an essentially circular sector-shaped shape. The essential structural features of the front (rear) housing half 11 (H') consist of the two stop points A and B, in the area formed by a stop edge IS and another edge 15' of the housing 10.

- 9 -Recess 16 and in the two circular grooves 17 and 18.

The first stop point A and the second stop point B are used to place the setting gauge on a roller 1 (see Fig.3). These two stop points A and B have a fixed distance a from each other.

A building edge 14 of each housing half 11, 11' , which connects the first stop point A and the second stop point B , is concavely curved inwards above an imaginary connecting line 19 running through the two stop points A and E. A stop chain 14 of each housing half 11, 11' runs - starting from the first stop point A - orthogonally to the connecting line 19 and, after a certain length b, merges into a further radially running edge 15'. The function of the recess 16 formed by the stop edge 15 and the further edge 15' is explained further below in the description of the measuring principle of the setting gauge.

Each housing half 11, 11' has two circular grooves 17 and 18 which run concentrically to the first stop point A. The circular grooves 17 and 18 of the front housing half 11 and the corresponding circular grooves 17' and 18' (Fig.2) of the rear housing half 11' serve to guide the rotor 20 which can be inserted between these two components (see below).

The front and rear housing halves 11 and 11' forming the housing 10 are held at a certain distance d (see Fig. 2) from one another by four spacer bolts 13a-13d. The distance d between the front and rear housing halves 11 and 11' is dimensioned such that the rotor 20 can be pivotally received together with the measuring arm 30 mounted therein so as to be displaceable in the radial direction in the cavity delimited by these two housing halves 11 and 11' inside the housing 10. The distance d must, however, be dimensioned such that tilting of the rotor 20 during its circular pivoting movement about the first stop point A within the pivoting range defined by the circular grooves 17 and 18 is prevented. Instead of the spacer bolts 13a-13d of the housing 10, any other spacer parts known to the person skilled in the art can be used. It is only important that these do not hinder the pivoting movement of the rotor 20.

Scales 40 are arranged on the front surfaces 12 and 12' of the front housing half 11 and the rear housing half 11'. Each individual scale of the scales 40 is assigned to a specific roller diameter or a certain range of roller diameters and is provided with a graduation 41, which in a particularly advantageous manner allows a direct reading of the angle of attack OU (see Fig. 3).

The arrangement of the scales 40 on the housing 10 and their scale divisions are easily apparent to the expert: The

Connecting line 19 between the first and second attachment points A and B of the housing 10 represents - with a setting gauge correctly placed on a roller 1 (see Fig.3) a chord of length a (i.e. the distance between the two stop points A and B) running through a contact point C of the scraper blade 2 on the roller 1 (see below and Fig.3). The angle ß enclosed by the connecting line 19 and a tangent 3 running through the contact point C (see Fig.3) consequently only depends on the diameter of the roller 1 - given a given distance between the stop points A and B. As can be seen from Fig.1a, the scales 40 assigned to the individual ranges of roller diameters are shifted by the angle Q resulting from the corresponding roller diameters resi.0 t i «, compared to the angle value enclosed between the connecting line 19 and the longitudinal direction of the measuring arm 30. In this case, the setting angle *C of "0"" is assigned the orthogonal position of the measuring arm 30 and the connecting line 19. The scale to be attached to the housing 10 for direct reading of the setting angle (see Fig.3) is easily calibrated by simple geometric relationships between this chord and the diameter of the roller. The setting gauge can be used in a particularly advantageous manner for rollers of almost any diameter.

The described two-part design of the housing 10 can be replaced by a one-part design at the discretion of the specialist. Only the described

Pivotability of the rotor 20 inside the housing 10 as well as the design of the housing edge 14 and the recess 16 of the housing 10 formed by the stop edge 15 and the further edge 15'.

The front rotor half 21 of the L»Mf«»»*i: 20 , which consists of two identically constructed rotor halves 21 and 21', is shown in Figure 1b. These also have an essentially circular sector-shaped shape. In its lower part, facing the first stop point A, the front (rear) rotor half 21 (21') is, however, widened to accommodate the measuring arm 30. Each rotor half 21, 21' has five bores 22a-22e, which are intended to accommodate the bolts 23a-23e connecting the front rotor half 21 and the rear rotor half 21'. The bolts 23a-23e also serve to guide the rotor 20 in the circular grooves 17, 17' and 18, 18' of the housing 10. The front and rear rotor halves 21 and 21' are held at a distance d' from one another by further spacers (not shown) , so that the measuring arm 30 can be slidably received in the cavity of the rotor 20 delimited by the two rotor halves 21 and 21'.

The measuring arm 30 (Figure Ic) has a rectangular shape, |

its length is such that it protrudes beyond the upper edge of the housing 10 when mounted. The measuring arm 30 has three recesses 33a-33c, which allow a radial stroke movement of the measuring arm 30 in the rotor 20

make possible.

For a simpler and more concise explanation of the interaction of the recesses 33a-33c of the measuring arm 30 with the bolts 23a, 23b and 23d of the rotor 20, the latter is shown again in Figure 1c. It can be seen that the bolts 23a and 23b are in the recesses on the two long sides 31 and 31' of the

The bolt 23d engages in the recesses 33a and 33b arranged in the measuring arm 30 and can be moved in these. The bolt 23d can be moved in the recess 33c arranged centrally in the lower half of the measuring arm 30.

The measuring principle of the setting gauge is explained using Figure 3. This shows a roll 1 of a paper machine, on which a scraper blade 2 engages at the contact point C. To measure the angle of attack *t between the scraper blade

_ and a tangent 3 running through the contact point C of the roller, the setting gauge is placed on the roller 1 via its first and second stop points A and B in such a way that the first stop point A of the housing 10 coincides with the contact point C of the scraper blade 2. The concave shape of the housing edge 14 means that the setting gauge can be placed on rollers 1 with - almost - any diameter.

Of particular advantage is the recess 16 of the housing formed by the stop edge and the further edge 15'

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10. This measure, in conjunction with the radial displacement of the measuring arm 30 in the rotor 20, means that the setting gauge can be used for scraper blades 2 of different thicknesses. The recess 16 makes it possible, even with scraper blades of different thicknesses, to always position the first stop point A above the contact point C on the roller, as is necessary for a correct measurement. The radial displacement of the measuring arm 30 makes it possible to move it when placing the scraper blade 2 on the roller 1 and when subsequently positioning the first stop point A of the setting gauge above the contact point C of the scraper blade 2 on the roller 1 in such a way that it does not hinder the insertion of the scraper blade 2 into the recess 16 of the housing 10. To carry out the measurement, the measuring arm 30 is then lowered again until its lower edge 35 rests on the surface of the solenoid blade 2 _;

The runner 20 is then rotated until the lower edge 35 of the measuring arm 30 rests flat on the scraper blade 2. The stop angle OC can then be read off at a mark 36 of the measuring arm 30 on the scale 40 of the housing 10.

In the structure shown in Fig.3, an angle of attack ot# of 26' was chosen as an example. The diameter of the roller 1 is 384 mm. The thickness of the

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Scraper blade 2 was assumed to be 5 mm. The scales 40 are arranged on the housing 10 in such a way that the right-hand longitudinal side 31' of the measuring arm 20 serves as a marking 36.

As can be seen from Fig.3, the angle of attack ·*» (26*) can then be read directly on the right-hand longitudinal side 31' of the measuring arm on the scale "300-399 mm" (second from the top) assigned to the roller diameter selected here of 384 mm.

Claims (6)

- 16 - Protection claims 1. Setting gauge for measuring the angle of attack (Q^) of a Scfeabcr-Kliage \2) , thereby »ekernia-ä i öhae &idigr;, &aacgr;&&bgr; e.':. .&ogr; Housing (10) has a first stop point (A) and a second stop point (B), which has a fixed distance (β) from the first stop point (A) of the housing (10), and that the first and the second stop point (AB) are connected by a concave housing edge (14) of the housing (10), and that the housing (10) has a recess (16) which is delimited by a stop edge (15) running through the first stop point (A) and by a further edge (15') of the housing (10), wherein the stop edge (15) of the housing (10) runs orthogonally to a connecting line (19) running through the first and the second stop point (A ₁ B) and after a fixed length (b) into the radially running further edge (15') and that the housing (10) has on its front side and on its rear side two circular grooves (17,17*,18,18*) arranged concentrically around the first stop point (A), and that a rotor (20) can be accommodated in the interior of the housing (10), which is guided pivotably in the circular grooves (17,18) of the housing (10) via bolts (23a-23e), and that a measuring arm (30) which is displaceable in the radial direction and has a marking (36) is accommodated in the ^rotor (ZO), and that on ■ ■ If·! ·· <· ■' 1 <· SS ■ · ·· · - 17 - at least one side of the housing (10) has a plurality of scales (40) with a degree division for direct reading of the angle of attack (#&). 2. Setting gauge according to claim 1, characterized in that the housing (10) is constructed in two parts from a front housing half (11) and a rear housing half (H') which are connected by spacer bolts (13a-13d) in ^ a fixed Ai»s»t&;- ^; (d) kept apart from each other. ⁷ s3rden, 3. Adjustment tube according to claim T, characterized in that the ^T runner (20) is constructed in two parts from a front runner half (21) and a rear runner half (21'). i-. Setting gauge according to claim 1, characterized in that the measuring arm (30) has a first and a second recess (33a, 33b) on each of its two longitudinal sides (31, 31*), &igr; , and that a third recess (33c) is provided centrally in the lower half of the measuring arm (30). 5. Setting gauge according to claim 1, characterized in that the scales (40) are assigned to specific ranges of roller diameters. 6. Setting gauge according to claim 1 ₍ characterized in that the housing (10), the rotor (20) and the measuring arm (30) are made of heat-resistant material.