DE202013004394U1 - Temperature measuring device and use thereof - Google Patents

Abstract

Temperature measuring device of a perforated plate (3) of an extruder with extrusion head (5), wherein the extrusion head (5) has the perforated plate (3) and a base body (4) with a contact surface (6) to a rear side (7) of the perforated plate (3), characterized in that a temperature measuring rod (8) in the base body (4) is arranged, which has a temperature sensor (9), wherein the temperature sensor (9) with the back (7) of the perforated plate (3) under mechanical biasing force in contact.

Description

The invention relates to a temperature measuring device of a perforated plate of an extruder with extrusion head. The extrusion head has the perforated plate and a base body with a contact surface to a rear side of the perforated plate.

Such an extruder with extrusion head, a perforated plate in the form of a nozzle plate and a base in the form of an adapter with supply channels for a plastic melt, which is fed via a contact surface to a back of the perforated plate openings in the perforated plate, is from the document DE 10 2004 007 713 A1 known. The perforated plate and the base body can machinable metal alloys, as from the document DE 10 2004 007 713 A1 known, wherein in such components of metal alloys temperature sensors may be integrated.

However, the perforated plate and the base body can also be made of different materials. For example, from the document WO 03/031132 A1 a nozzle head with a perforated plate made of difficult to process ceramic, while the main body has a machinable metal alloy

A problem during a production process of granulated plastic strands which are to be fed to a granulator or granulated directly at the exit from the perforated plate by means of hot punching in a cooling gas atmosphere or cold cut under cooling water and / or by means of a Wasserringgranuliervorrichtung, it is over a longest undisturbed process time the temperature to keep the perforated plate in an optimal process temperature range. Namely, if the heat input through the hot plastic melt in the nozzle head is too high, the viscosity of the extruded plastic jet or plastic strand may not be high enough to beat granules by rotating cutting devices on the perforated plate openings or a granular plastic strand for a remote from the perforated plate granulator to build.

If, on the other hand, the heat input through the plastic melt in the nozzle head is too low, the entire extrusion process and / or the granulation process can come to a standstill. For this case, the most varied tempering devices are known from the prior art, which heat the main body of the extrusion head at the beginning of the process and temper during the extrusion process. From the publication WO 03/031132 A1 For this purpose, a nozzle head is known, which has heating cartridges in the base body, which can additionally heat and keep the nozzle channels warm. There is thus a need to monitor and control the temperature at the orifice plate over which the plastic melt exits.

The object of the present invention is to take this need into account and to provide an improved temperature measuring device which is integrable in the extrusion head and offers the possibility, inexpensively and spatially adjusted the temperature of a perforated plate of an extrusion head with particular attention to the structure of the extrusion heads for granulation to monitor.

This object is achieved with a temperature measuring device with the features of claim 1. Preferred embodiments of the invention are defined in the subclaims.

An embodiment of the temperature measuring device according to the invention relates to a perforated plate of an extruder with extrusion head, wherein the extrusion head has the perforated plate and a base body with a contact surface to a back of the perforated plate. A temperature measuring rod is arranged in the base body. The temperature measuring rod has a temperature sensor. The temperature sensor is in contact with the back side of the perforated plate under mechanical pretensioning force.

An advantage of the temperature measuring device according to the invention is that with the temperature measuring device a possibility is created to detect the temperature of the perforated plate by direct contact with the back of the perforated plate and to regulate the temperature of the perforated plate in a temperature measuring range. These advantages are due to the fact that the temperature sensor of the temperature rod is pressed directly onto the back of the perforated plate with a biasing force. Thus, there is a direct contact between the probe and the perforated plate, which is not the case with previous solutions. Usually, only the temperature of the plastic melt is detected remotely from the extrusion head, which is then fed via corresponding channels and distribution structures of the perforated plate.

The measuring device according to the invention also has the advantage that the possibility of directly monitoring and detecting the temperature of the perforated plate for the first time makes it possible to optimally dispense the plastic in a granulation chamber with a cutting device or in a supply device to a granulator can be significantly reduced.

In a further embodiment of the invention, the mechanical biasing force is based on a resilient bias, which hydromechanical, pneumatic or electro-mechanical means for applying the required bias are advantageously excluded, especially as spring elements are much better adapted to the tight spatial conditions of an extrusion head.

For this purpose, it is provided that the mechanical preload force F is between 50 N ≦ F ≦ 200 N, preferably between 75 N ≦ F ≦ 150 N, and more preferably F = 100 N. This relatively low biasing force protects the orifice plate and the temperature sensing rod from overloading, yet is sufficient to maintain intense thermal contact between the back surface of the orifice plate and the temperature sensor. In addition, this resilient bias protects the temperature measuring device against damage from vibrations and other mechanical shocks. For this purpose, the temperature sensor may be additionally surrounded in the transition from the contact surface of the body to the back of the perforated plate of a ring-shaped or disc-shaped sealing element, so that penetration of the melt material and deterioration of the contact zone between the temperature sensor and the back of the perforated plate is prevented.

In a further embodiment of the invention, it is provided that the spring element is supported on the base body and is mechanically operatively connected to the temperature rod. The support of one end of the spring element on the base body can be adapted in different ways and depending on the nature of the spring element to the spatial conditions of the extrusion head. The same applies to the realization of the mechanical operative connection between the spring element and the temperature measuring rod.

In a further embodiment of the invention, the temperature sensor protrudes from the contact surface of the base body with the perforated plate removed in a spring-elastic relaxed state of the temperature rod with a projection v out. This projection v can have between 0.25 mm ≦ v ≦ 5 mm, preferably between 1 mm ≦ v ≦ 4 mm and more preferably v = 3 mm. In order to adjust and / or check this projection v, it is necessary to remove the perforated plate from the base body. As soon as the rear side of the perforated plate is re-applied to the abutment surface of the main body, the sensor is displaced in the direction of the abutment surface by the length v and thus also biased the spring element, so that the previously calculated biasing force between the probe and back of the perforated plate adjusts.

In a further embodiment, the temperature measuring rod extends in its mechanically biased state of an initial surface of the body to the contact surface thereof. The starting surface and the contact surface of the base body are aligned parallel to each other. The measuring rod can be arbitrarily, between the initial surface and the contact surface depending on the spatial conditions within the extrusion head, d. H. be aligned at any angle to the initial surface or the contact surface.

In a further embodiment of the invention, the spring element is a leaf spring. Such a leaf spring has the advantage that with the help of their spring constants and their cross section and the Einspannmodalitäten and taking into account the size of the projection v with which the temperature measuring stick protrudes with remote perforated plate from the contact surface of the body, very accurately the biasing force can be calculated.

For this purpose, one end of the leaf spring can be fixed on the starting surface of the main body and the leaf spring itself with its other end on the temperature measuring rod opposite to the temperature sensor supported to form the biasing force. The required effective length, as well as the width and thickness of the leaf spring can be made extremely compact and low for this purpose, in order to raise the required biasing force F can.

Instead of a leaf spring has in an alternative embodiment of the invention, the temperature measuring device as a spring element, a coil spring which surrounds the temperature measuring rod and is clamped between a shoulder of the base body and the temperature measuring rod. For this purpose, one end of the coil spring can be supported on an incorporated in the body paragraph. The helical spring has over the leaf spring the advantage that the entire device for generating a biasing force can be introduced into a profiled or stepped bore in the body.

Furthermore, it is provided that the temperature measuring rod is arranged to be movable in a bore orthogonal to the contact surface of the base body. Due to the mobility, it can be ensured that the temperature measuring rod can press its measuring temperature sensor unhindered onto the back of the perforated plate. While for a leaf spring, an additional expense by introducing stepped recesses in the initial surface of the body, as is the 1 to 3 show, the spatial requirements for the solution with a coil spring only on the structure of the required hole limited in an advantageous manner, as it is 4 clarified.

The temperature sensor opposite end of the temperature measuring rod is connected to measuring lines, the measuring leads can be arranged in a further embodiment of the invention in grooves of the starting surface of the base body and extending to an edge side of the body. This arrangement has the advantage that the processing effort of the base body for accommodating both the temperature measuring rod and its measuring lines can be realized relatively inexpensively and that access to the measured data of the temperature measuring rod from one edge side of the extrusion head is made possible.

Furthermore, it is provided that the temperature sensor has a thermocouple. Alternatively, however, a bimetallic plate or thermoresistors, for. B. known under the name Pt100, or a resistance thermometer can be used as a temperature sensor.

In order to place the temperature sensor even more targeted in a certain area of the perforated plate according to a further preferred embodiment, the temperature sensor according to the invention protrude at least with a part of its contour in a depression of the perforated plate, wherein preferably the depression in the contour of at least a part of the contour of the Temperature sensor corresponds. In particular, the temperature sensor can thus be brought closer to the passing of the cooling medium in connection with the surface of the perforated plate and the temperature measurement can thus be made more targeted in this area. Thus, the temperature gradient occurring between the relatively cold, cooled by the cooling medium surface and the interior of the heated by the melt material perforated plate due to the temperature gradient occurring in the perforated plate can be punctually exactly detectable.

In a preferred use of the above-described temperature measuring device, it is installed in a granulating plant which is in operative connection with an extruder head of an extruder, especially since these plants require precise temperature detection at the beginning and during the process.

The invention will be described in more detail below with reference to the exemplified embodiments.

1 shows a schematic, perspective in the plane rectified, partially cross-sectional view of an extrusion head with a temperature measuring device according to a first embodiment of the invention;

2 shows a schematic cross section along the section line AA in 1 ;

2a shows a perspective view of an angled temperature measuring rod;

3 shows a schematic cross section through a base body, in which a temperature measuring device of a second embodiment of the invention is integrated;

3a shows a schematic cross section through a base body, in which a temperature measuring device of the second embodiment of the invention according to 3 integrated, together with the perforated plate;

3b shows a schematic cross section through a base body, in which a temperature measuring device of the invention is integrated, together with the perforated plate according to another embodiment of the invention;

4 shows with the 4a and 4b Schematic diagrams of a third embodiment of the temperature measuring device according to the invention;

5 shows a schematic cross section through a fourth embodiment of the temperature measuring device according to the invention.

1 shows a schematic, perspective, rectified in the plane, partially cross-sectional view of an extrusion head 5 with a temperature measuring device 1 according to a first embodiment of the invention. The presentation of the 1 is shown in perspective not distorted with respect to the elements not shown cut, but shown for reasons of simplicity of presentation undistorted according to a non-perspective top view in the drawing plane. The extrusion head 5 consists essentially of two components, a basic body 4 and a perforated plate 3 , where the main body 4 with a contact surface 6 on a backside 7 the perforated plate 3 is applied. In the center of the main body 4 , which is disc-shaped in this embodiment, is a central melt channel 27 in the form of a hole. The central melt channel is in operative connection with recesses in the form of radial channels 28 and 29 , which are shown here in cross-section, being in the center of the recess in the perforated plate 3 a distribution cone 37 is arranged, which over the central melt channel 27 in the direction of arrow B from an extruder pressed melt masses on the radial channels 28 and 29 distributed. The melt distribution does not have to the embodiment shown here by means of individual, radial melt channels 28 . 29 be limited, but the melt guide can also z. B. also by ring, fan or helical channels.

For this purpose, the pressed melt is deflected in a horizontal melt flow in the direction of arrow C and then opens into nozzle channels 31 and 32 leading to exit openings 33 and 34 the perforated plate 3 rejuvenate. The perforated plate 3 comes with a stepped retaining ring 41 on the contact surface 6 of the basic body 4 with her backside 7 pressed. Between the retaining ring 41 and the perforated plate 3 is in the transition between the back 7 the perforated plate 3 to the contact surface 6 of the basic body 4 a ring seal 42 arranged, which ensures that no melt to edge sides 21 of the basic body 4 between the contact surface 6 and the back 7 can escape. For pressing the ring seal 42 and for holding the perforated plate 3 are in the scope of the retaining ring 41 Distributed screws, of which in the cross section of the retaining ring 41 in this 1 two opposite screws 38 and 39 are shown.

Due to the radial channels 28 and 29 coming from the central melt channel 27 Branch radially, is the bearing surface of the body 4 on the back side 7 the perforated plate 3 essentially limited to an area whose contour has two semi-annular dashed lines 35 and 36 in 1 will be shown. In this limited annular area can be a reliable temperature detection of the perforated plate 3 be performed. For this it is provided that a temperature sensor 9 in this annular area the back 7 the perforated plate 3 contacted. For this purpose, in this embodiment of the invention, an angled temperature measuring rod 8th used, which has at its tip the sensor, with removed perforated plate 3 by a few millimeters from the contact surface 6 of the basic body 4 stands out and the one in the 1 shown position with a biasing force the back 7 the perforated plate 3 contacted.

This mechanical preload force is provided with a spring element 10 in the form of a leaf spring 12 applied. The leaf spring 12 is in a recess of the main body 4 arranged, with the recess 26 in an initial area 11 of the basic body 4 is introduced. The starting area 11 is parallel to the contact surface 6 arranged the base body. In the recess 26 is an end 15 the leaf spring 12 fixed while another end 16 is freely movable and the angle head 24 of the angled temperature measuring rod 8th in the 1 pretensions shown state. From the angle head 24 extend measuring leads 18 and 19 to the edge side 21 of the basic body 4 in one in the starting area 11 introduced groove 20 ,

The leaf spring 12 preferably consists of a small piece of sheet metal with an effective length l between the clamped end 15 and the pad on the angle head 24 of the temperature measuring rod 8th , This contact point on the angle head of the temperature measuring rod is also referred to as a clamping point. The dimensions for the width b and the thickness d and the required effective length l give a biasing force on the angle head 24 and thus on the temperature sensor 9 due to the following relationship:

Therein, F is equal to the bearing force or biasing force for the temperature sensor in a preferred range between 50 N ≦ F ≦ 200 N, preferably between 75 N ≦ F ≦ 150 N and more preferably F = 100 N. The width of the leaf spring is b, the Thickness of the leaf spring is d, the deflection of the leaf spring in the state like him 1 is, v, where E is the modulus of elasticity of the leaf spring material, which is for example E = 210000 N / mm ² for steel. With a parameter set for b = 10 mm, l = 25 mm, d = 1 mm and v = 3 mm, this results in a technically meaningful design for a preload force of 100 N for the temperature sensor 9 on the back 7 the perforated plate 3 ,

2 shows a schematic cross section along the section line AA in 1 , Components with the same functions as in 1 are identified in the following figures with the same reference numerals and not discussed separately.

In 2 the perforated plate has been removed to allow cooperation between the leaf spring 12 and temperature dipstick 8th to explain in this first embodiment of the invention. In the in 1 shown position of the temperature measuring device 1 is a hole 17 arranged, extending from the starting area 11 up to the contact surface 6 of the basic body 4 extends. This hole 17 is in this 2 orthogonal to the contact surface 6 Aligned, however, can be any angle with respect to the contact surface 6 for the hole 17 to get voted.

The diameter of the hole 17 is greater than the diameter of the temperature measuring rod in this embodiment of the invention 8th , so that the temperature measuring rod 8th in the hole 17 can move axially without hindrance. In addition, the diameter of the hole 17 smaller than the outer dimensions of the angle head 24 of Temperature measuring stick 8th , so the angle head 8th on the end of the hole 17 rests.

The recess 26 for the leaf spring 12 is in three stages in the starting area 11 introduced with a first stage 43 , the thickness d of the leaf spring 12 matches and on the first end 15 the leaf spring 12 is fixed. A second stage 44 is inserted deeper into the main body to allow a free deflection of the leaf spring 12 to enable. A third stage 45 is the shape of the angle head 24 adapted and locked the angle head 24 at a designated depth. From the third stage 45 the recess 26 extends the hole 17 up to the contact surface 6 of the basic body 4 , Here is the depth of the third stage 45 such that the temperature measuring rod by the amount v from the contact surface 6 of the basic body 4 protrudes. Then the perforated plate 3 with the main body 4 get connected.

In order to produce a preload of 100 N with the dimensions of the above-mentioned leaf spring, it makes sense that this amount of protruding of the temperature measuring rod from the contact surface 6 to limit to 3 mm. The effective length l for the leaf spring, which enters into the above calculation, ranges from the transition of the first stage 43 to the second stage 44 until the rest of the free end 16 the leaf spring on the angle head 24 of the temperature measuring rod 8th ,

2a shows a perspective view of an angled temperature measuring rod 8th with a temperature sensor 9 , the angle head 24 and an angled thigh 46 who has the test leads 18 and 19 includes and ensures that the test leads isolated in the in 1 shown groove 20 be guided. An assembly of such an angled temperature measuring rod 8th has the following assembly steps. After the three-step recess in the starting area 11 of the basic body 4 along with the groove 20 and the hole 17 is finished, the angled temperature measuring rod 8th into the hole 17 let in and at the same time the thigh 46 in the groove 20 aligned. Subsequently, a prepared leaf spring 12 , which is slightly pre-bent, with its end 15 on the first level 43 fixed and presses on the angle head 24 so the temperature dipstick 8th in the third stage 45 the recess 26 is biased fixed and the temperature sensor 9 about 3 mm from the contact surface 6 of the basic body 4 protrudes.

3 shows a schematic cross section through a base body, in which a temperature measuring device 2 A second embodiment of the invention is integrated. In this embodiment according to 3 is based on the exact design of a third stage 45 omitted and instead a paragraph 14 incorporated into the body and the bore 17 above the heel 14 extended so that a spring element 10 in the form of a coil spring 13 between the paragraph 14 and the angle head 24 can be arranged and a counter tension against the leaf spring 12 can exercise.

In this case, this counter-voltage is provided less than the bias voltage by the leaf spring 12 caused, so the temperature sensor 9 still off the investment surface 6 of the basic body 4 stands out by an amount v. The coil spring 13 that in the hole 17 around the temperature dipstick 8th is housed, and on the heel 14 the bore 17 and a bottom of the angle head 24 is supported in the in 3 shown rest position with a gentle, compared to the contact pressure of the leaf spring 12 low tension against the leaf spring 12 pressed so that the temperature dipstick 8th only with a minimal amount v from the main body 4 protrudes. In addition, by the additional coil spring 13 created a tolerance to minor deviations.

The 3a shows to illustrate the assembly situation a schematic cross section through the base body, in which the temperature measuring device of the second embodiment of the invention according to 3 integrated, together with the perforated plate 3 ,

The 3b shows a schematic cross section through a base body, in which a temperature measuring device of the invention is integrated, together with the perforated plate 3 according to a further embodiment of the invention. The temperature sensor 9 protrudes at least with a part of its contour in a depression 51 the perforated plate 3 into it, the sinking 51 expediently corresponds in its contour to at least a part of the contour of the temperature sensor.

4 shows with the 4a and 4b Schematic diagrams of a third embodiment of the invention for a temperature measuring device 30 , This is the angled temperature measuring rod 8th modified and points in its lower part, above the temperature sensor 9 a clamping ring. This clamping ring can either non-positively or in an annular groove of the temperature measuring rod 8th be attached by means of a clamping ring form-fitting. The recess 26 in the starting area 11 of the basic body 4 points next to the groove 20 only one hole for the test leads 17 on with a paragraph 14 in the hole that serves to the angle head 24 to wear and fix in the way that the temperature sensor 9 by the amount v from the contact surface 6 of the basic body 4 protrudes when the perforated plate 3 is removed.

Between the clamping ring 25 and the paragraph 14 is a coil spring 13 arranged when attaching the perforated plate 3 is subjected to pressure and twisted, so that a biasing force can be exerted on the back of a perforated plate. To the contact between the perforated plate and the temperature sensor 9 ensure surrounds a ring seal 50 the hole 17 in the area of the contact surface 6 of the basic body 4 ,

Also with a coil spring 13 acting as a helix around the temperature dipstick 8th is formed around, the biasing force F can be calculated exactly when the spring constant K of the coil spring is known, since this biasing force of the product of the deflection, which corresponds to the amount v, and the spring constant K gives: F = v · K

5 shows a schematic cross section through a fourth embodiment of the invention of a temperature measuring device 40 , The difference from the previous embodiments is that the perforated plate 3 in this embodiment is divided into a distributor plate 22 and a thin ceramic hole plate 23 , To these two plates 22 and 23 together against the contact surface 6 of the basic body 4 to press, is the retaining ring 41 modified in that now two holding levels are provided, wherein a first holding stage 47 the distributor plate 22 holds in place and a second holding stage 48 fixed the ceramic hole plate. In addition, additional ring seals are required for this solution. Instead of ceramic material, any other suitable hard and / or low heat conducting material can be used accordingly.

Next to the ring seal 42 , which now has a reduced diameter compared to the arrangement in 1 has, is another ring seal 49 at the transition of the first holding stage 47 to the second stop level 48 arranged to ensure that the melt flow exclusively through the openings 33 and 34 emerges in the ceramic perforated plate. The temperature measuring rod 8th now extends not only in the body 4 but reaches back to the back 7 the ceramic hole plate 23 zoom in, leaving the hole 17 not only in the main body 4 but also in the distributor plate 22 is arranged. If so 5 a leaf spring 12 shows, is also possible for this case, the embodiment of the 3 or 4 for the temperature measuring device 40 of the 5 use.

Although at least exemplary embodiments have been shown in the foregoing description, various changes and modifications may be made. The above embodiments are merely examples and are not intended to limit the scope, applicability, or configuration of the temperature measuring device in any way. Rather, the foregoing description provides those skilled in the art with a blueprint for practicing at least one exemplary embodiment of the temperature measuring device, wherein numerous changes can be made in the use and construction of the temperature measuring device of temperature sensing device components described in exemplary embodiments, without departing from the scope of the appended claims to leave their legal equivalents.

LIST OF REFERENCE NUMBERS

1

Temperature measuring device (1st embodiment)

2

Temperature measuring device (2nd embodiment)

3

perforated plate

4

body

5

extrusion head

6

Contact surface of the body

7

Back of the perforated plate

8th

Temperature measuring stick

9

temperature sensor

10

spring element

11

initial surface

12

leaf spring

13

coil spring

14

Paragraph of the main body

15

End of the leaf spring (fixed)

16

other end of the leaf spring (movable)

17

drilling

18

Measurement line

19

Measurement line

20

groove

21

Edge side of the body

22

distribution plate

23

Ceramic perforated plate

24

angle head

25

clamping ring

26

recess

27

central melt channel

28

radial channel

29

radial channel

30

Temperature measuring device (3rd embodiment)

31

nozzle channel

32

nozzle channel

33

Opening in the perforated plate

34

Opening in the perforated plate

35

dashed line

36

dashed line

37

distributor cone

38

screw

39

screw

40

Temperature measuring device (4th embodiment)

41

retaining ring

42

ring seal

43

first stage

44

second step

45

third step

46

leg

47

hold stage

48

hold stage

49

ring seal

50

ring seal

51

depression

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102004007713 A1 [0002, 0002]
• WO 03/031132 A1 [0003, 0005]

Claims (17)

Temperature measuring device of a perforated plate ( 3 ) of an extruder with extrusion head ( 5 ), wherein the extrusion head ( 5 ) the perforated plate ( 3 ) and a basic body ( 4 ) with a contact surface ( 6 ) to a back side ( 7 ) of the perforated plate ( 3 ), characterized in that a temperature measuring rod ( 8th ) in the body ( 4 ), which has a temperature sensor ( 9 ), wherein the temperature sensor ( 9 ) with the back ( 7 ) of the perforated plate ( 3 ) is in contact under mechanical prestressing force. Temperature measuring device according to claim 1, characterized in that the mechanical biasing force is based on a resilient bias. Temperature measuring device according to claim 1 or claim 2, characterized in that the mechanical biasing force F between 50 N ≤ F ≤ 200 N, preferably between 75 N ≤ F ≤ 150 N and more preferably F = 100 N. Temperature measuring device according to one of the preceding claims, characterized in that the temperature measuring device ( 1 ) a spring element ( 10 ), which is located on the main body ( 4 ) and with the temperature measuring rod ( 8th ) is mechanically in operative connection. Temperature measuring device according to one of the preceding claims, characterized in that the temperature sensor ( 9 ) from the contact surface ( 6 ) of the basic body ( 4 ) with removed perforated plate ( 3 ) protrudes in a resiliently relaxed state with a projection v, which has between 0.25 mm ≤ v ≤ 5 mm, preferably between 1 mm ≤ v ≤ 4 mm and more preferably v = 3 mmm. Temperature measuring device according to one of the preceding claims, characterized in that the temperature measuring rod ( 8th ) in a mechanically prestressed state from an initial surface ( 11 ) of the basic body ( 4 ) to the contact surface ( 6 ), wherein the initial surface ( 11 ) and the contact surface ( 6 ) of the basic body ( 4 ) are aligned parallel to each other. Temperature measuring device according to one of claims 4 to 6, characterized in that the spring element ( 10 ) a leaf spring ( 12 ). Temperature measuring device according to one of claims 4 to 6, characterized in that the spring element ( 10 ) a coil spring ( 13 ). Temperature measuring device according to claim 8, characterized in that the helical spring ( 13 ) the temperature measuring rod ( 8th ) and between a paragraph ( 14 ) of the basic body ( 4 ) and the temperature measuring rod ( 8th ) is clamped. Temperature measuring device according to claim 7, characterized in that one end ( 15 ) of the leaf spring ( 12 ) on the starting surface ( 11 ) of the basic body ( 4 ) is fixed and the leaf spring ( 12 ) with its other end ( 16 ) on the temperature measuring rod ( 8th ) opposite to the temperature sensor ( 9 ) is supported to form the biasing force. Temperature measuring device according to one of the preceding claims, characterized in that the temperature measuring rod ( 8th ) in a bore ( 17 ) orthogonal to the abutment surface ( 6 ) of the basic body ( 4 ) is movably arranged. Temperature measuring device according to one of claims 6 to 11, characterized in that the temperature measuring rod ( 8th ) with test leads ( 18 . 19 ), which are in grooves ( 20 ) of the initial area ( 11 ) of the basic body ( 4 ) are arranged and to a side edge ( 21 ) of the basic body ( 4 ). Temperature measuring device according to one of the preceding claims, characterized in that the temperature sensor ( 9 ) has a thermocouple. Temperature measuring device according to one of claims 1 to 12, characterized in that the temperature sensor ( 9 ) has a bimetallic plate. Temperature measuring device according to one of claims 1 to 12, characterized in that the temperature sensor ( 9 ) has a resistance thermometer. Temperature measuring device according to one of the preceding claims, characterized in that the temperature sensor ( 9 ) at least with a part of its contour in a depression ( 51 ) of the perforated plate ( 3 ), wherein preferably the depression ( 51 ) in its contour that at least a part of the contour of the temperature sensor ( 9 ) corresponds. Granulation plant equipped with an extrusion head ( 5 ) is in operative connection and a temperature measuring device ( 1 . 2 . 30 . 40 ) according to one of the preceding claims.

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