DE1964183U - DEVICE FOR CONTROLLING DRYING SYSTEMS. - Google Patents

Description

·. · .: \ ' Markfplaiz 9

PATENT ENGINEER ... r

Telephone (07732) 782

My sign B 64-67 RADOLFZELL, on March 10, 1967

Ludwig Bollmann., Manufacturer ^

7703 Rielasingenj Gutenbergstrasse 21

Device for controlling
Drying systems.

The innovation relates to a device for regulating drying systems for fabrics with a fiber saturation point , in which the drying periods before and after the fiber saturation point can be regulated separately.

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PATENT ENGINEER

The rule applies to systems for drying everyone organic or hygroscopic substances., in which the known fiber saturation occurs. The following examples and explanations are limited to wood drying., because on the one hand there is a particularly large variety of different drying processes and on the other hand The correct control has a particularly large influence on the quality of the dried material.

! An embodiment of the innovation is in the drawing and is described in more detail below. It show . -

Fig. 1 is the schematic diagram of an example of a

individual drying process and FIG. 2 is a schematic view of the control panel with the

modern control devices.

1 shows on the basis of a diagram; how the factors normally change within a drying process. The ordinate indicates the temperature in ⁰ C or the humidity in% and the abscissa the drying time. The solid line a represents the decreasing wood moisture content _Λ the dash-dotted line b the free., · Air humidity in the chamber .. The temperature. ^ Result from the dashed lines, namely the dry temperature from the line c and the wet temperature from the line d. The example refers to

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PATENT ENGINEER

a middle oak wood with., a bulk density of ea. 65o kg / m atrOj. au.f a chamber temperature of 45. C ₁ the below fiber saturation is raised to 75 C (corresponding to the quality desired in the example).

If such a wood is delivered with 70 % initial moisture and the final moisture should be 11%, then the drying cycle takes place in the delimited areas, with A denoting the period until the fiber saturation point is reached. The heating-up span of the second drying period is _{indicated with B 1, the} final drying with C and the conditioning that is usually connected is indicated with D. The duration of the. the latter is arbitrarily assumed here with an average value of 10% of the drying time.

The abscissa band shows that the drying time depends very much on the wood thickness, all other factors being the same. In the example shown, with a thickness of 30 mm, the first period A would be approx. 122 Stä. ₄ the second BjC approx. 86 hours, with a thickness of 6o mm the periods would be approx. 335 and 24o. Take hours. -

The innovation provides for the interaction of various control organs, which replace the functions of the previously common control curves. These organs are in a control panel of Figure 2 summarizes -. Ihr.e electrical training contains individual elements known to the person _A, the

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PATENT ENGINEER

man are familiar in many variations, which is why the following explanations can be limited to these functions. . ■.

The individual factors are controlled via devices in a familiar way the; ' entered by running measurement Compare the actual value with the set target value and, if there is a discrepancy, change it until it is again with the Setpoint value above agrees .. The innovation concerns the control the setpoints. . ..: "-," .-.

As long as the existing wood moisture is above the fiber saturation experience has shown that a constant temperature and Humidity ^ For this area A, a drive, a temperature controller 2 and a humidity controller 3 are sufficient. Your scales are usually on the usual work areas designed, but can of course also be expanded as required · This can be laid out for o-150 hours in the example Drive 1 also set up aui o-5oö hours or something can also be supplemented by a switchable second drive with 150-5oo hours.

In principle, the same equipment is provided for the conditioning D, the control values of which can also be constant. The desired duration is displayed on drive 9 _Λ the drying temperature on controller 8 and the temperature

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PATENT ENGINEER

difference set on the humidity controller 10. Since the drying temperature of the second drying period BjC normally remains unchanged for conditioning D, a common controller 8 _{can be used for areas B A C and D.}

The quality of the dried, wood is in the second Period BjC decided., Namely. is . this depends on Dry slope or potential. From known calculations the maximum dry temperature and the steepest possible Determine drying potential. This results in the associated decrease in moisture, i.e. the increase in Temperaturdifferenzj their limit values and the duration of these second dry season BjC.

The innovation provides for two interlinked control devices: a potential _{generator, 4 and one or more speed controllers 6 Λ} 7. ■ The first has a rotary element »which assigns the setpoint value of the fire controller constantly and proportionally. changed its rotation. The. Rotary link is coupled to one of the speed controllers 6 or 7, which is continuously adjustable and determines the angular speed of the rotary link. The setting results from the ratio of the drying time of the second period B "C hhä" to the ascertained increase in the temperature difference and takes place via _; he is the guideline value in hours per C increase in temperature difference. In order to achieve the finest possible

PATENT LENGTH LEUIi

To enable the setting, it is advisable to provide several speed controllers 6, 7 for different ranges (e.g. 0.2 to I ₄ I and 1.0 to 20.0 h / ° C), one of which is connected to the potential generator 4 via a selector switch 5 connected is.

The automatic transition of the individual dry periods happens by switches 11, which are arranged on the drive 1, the potential generator 4 and the drive 9 so that they after the set times have elapsed, e.g. operated by the pointer. The period that has elapsed is and the next one is switched on or, after conditioning D, the entire system is switched off.

The way in which the regulation according to the amendment works is set out below will be explained using a practical example in connection with Fig. 2:

The order, tables and calculation result in the following values determined: first dry period A = duration 120 hours, dry temperature 45 C and temperature difference 5 C; second dry period B, C -E duration 9'3 hours, drying temperature 75 C. and Temperature difference increasing from 5 to 20 C; Conditioning D = duration 30 hours, drying temperature as before and. Temperature difference constant at 18 C. Corresponds to these values hence the following setting:

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Drive 1 up, 120; Controller 2 to 45 and controller 3 to 5; Controller 8 to 75 ₄ haufwerk 9 to 3ö and controller 10 to The potential generator 'Λ 4 must adjust the temperature difference in 93 S "td: by 15 C from 5 to 2o C, i.e. at 93:15 = 6 _Λ 2 h / ° C. The speed controller 7 is set to this value, which is coupled with the selector switch to the potential generator 4. Its setting can be simplified if the scale 12 is designed to be rotatable and lockable. It will then have its end value = 20 C is set to the final mark suitably formed by the holder 11 and the pointer of the rotary link is at the starting position of 5 C; Of course, "the scale 12 must be connected to the setpoint position of the controller in such a way that it takes it along when it is turned; this level value must then also be connected to the pointer or the rotary link .."

Controls 2 and 3 then hold their own during drying Setpoints in the first period A constant while drive 1 is running. When the zero mark is reached, over the switch 11 off the first period and the second switched on, after which the rotary member of the potential generator starts to rotate starting from the initial value 5, namely at the set speed of 6.2 h / ° C according to Setting on controller 7. Once this setting has been made precisely, then the pointer of the potential generator reaches after

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PATENT ENGINEER

Exactly 93 hours on switch 11 and thereby initiates conditioning. By switching to temperature controller 8, the chamber temperature was also increased to 75 C in the area. B) _Λ at which level it remains until the end of the second period C and unchanged in conditioning D, while the humidity in area D corresponds to the Setting. On which controller 10 is now switched on is slightly raised. After the 30 hours set in the drive 9 has elapsed, it switches off the entire system via switch 11 ... ,

The advantages of the innovation li, .egen / Ö.arin , __ that the temperature gradient, in the full S range, can be continuously adjusted in any combination with all other E-setting values and thus both. The highest possible dry goods quality as well as that for each The desired quality is the most economical, ie the shortest drying time can be achieved. The expensive and time-consuming preparation of the previously necessary control cams is no longer necessary.

Claims (6)

, P ATENTING ENGINEERS claims for protection 1. / Device for controlling drying systems for fabrics with a fiber saturation point at which the drying sections before and after the fiber saturation point can be regulated separately, characterized in that there is a potential generator (4) contains., Whose rotary member (4a) with a known per se Drive unit coupled and also via a well-known transmission gear connected to the humidity controller is. '' 2. / Device according to claim 1, characterized in that at the end - the track of the duration of the first drying section (A) controlling drive (1) a switch (11) is arranged, which contains two contacts, one of which is a normally closed contact in the circuit of the control units. (1,2,3) for the first Dry section (A) and the other as working contact in the management circuit of the control units (4,5,6,7,8) for the second drying section (B, C) is inserted. 3. / Device according to claim 1 or 2, characterized in that a switch (lla) is arranged at the end of the lane of the rotary member (4a) belonging to the potential generator (4), the two Contains contacts, one of which is a normally closed contact in the circuit of the potential generator (4) and its control - 10 - ■ / jVSJliyiKJ U LäliCi ELd © [! [ISS - - '"■' ■ '■". "Page - 10 - / PATENT ENGINEER devices (5 _Λ 6 _Λ 7) and the other is inserted as a normally open contact in the circuit of the control devices (©, 10) for the conditioning section (D). 4 / Apparatus according to claim 3 characterized in that the _{S t} that the rotary member (4a) of the potential sensor (4) with a known per se, en adjustable speed controller (6 or '7) is verkuppelt. 5. / Apparatus according to claim 4, characterized in that the Several lines of speed regulators (6 and 7) with different setting ranges in a selector switch (5) are performed, which in turn is connected to the potential generator (4). 6. / Device according to one of claims 1 to 5 _Λ characterized in that the potential generator (4) · is provided with a rotatable and lockable scale (12), the setting mark of which is mechanically connected to the switch (Ha). The. Representative / i GÜNTER L.GEISS PATENT ENGINEER RADOLFZELL / ßODENSEE