Abstract
A measuring device for ascertaining the temperature of a roller surface of a roller body is insertable into a recess of the roller body and includes at least first and second temperature sensors, a mounting rod on which the sensors are situated in the axial direction of the mounting rod spaced apart from each another, and, on each side of each respective one of the temperature sensor in the axial direction a respective supporting element arranged on the mounting rod. Between the supporting elements, the mounting rod is flexible such that each of the temperature sensors is able to be pressed onto an inner wall of the recess with a defined contact force.
Claims
1-9. (canceled)
10. A measuring device for ascertaining a temperature of a roller surface of a roller body, the measuring device being insertable into a recess of the roller body, the measuring device comprising: a first temperature sensor; a second temperature sensor; a mounting rod on which the first and second temperature sensors are situated spaced apart from each other in an axial direction of the mounting rod; for each of the first and second temperature sensor, on each side of the respective temperature sensor, in the axial direction, a respective support arranged on the mounting rod, wherein the mounting rod is flexible between the supporting elements such that each of the first and second temperature sensors is able to be pressed with a defined contact force against an inner wall of the recess.
11. The measuring device of claim 10, wherein the mounting rod is made of steel at least between the supporting elements.
12. The measuring device of claim 10, wherein the mounting rod is made of spring steel at least between the supporting elements.
13. The measuring device of claim 10, wherein the supporting elements are formed from at least one of steel and plastic.
14. The measuring device of claim 10, further comprising a wireless communication unit, an energy supply, and a processing unit that are situated in a sleeve mounted on a front side on an end of the mounting rod.
15. The measuring device of claim 14, wherein the sleeve is one of the supporting elements.
16. The measuring device of claim 14, wherein the sleeve has a cross section that corresponds to a cross section of the recess.
17. The measuring device of claim 10, wherein each of one or both of the first and second temperature sensors includes (a) a temperature sensor element and (b) a spring contact via which the temperature is transmittable from the inner wall of the recess to the respective temperature sensor element.
18. The measuring device of claim 17, wherein the spring contact has a spiral-shaped or s-shaped spring element.
19. The measuring device of claim 18, wherein the spring contact includes a contact element and a guide for the contact element, and the spring element is situated between the contact element and the temperature sensor element.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0019] FIG. 1 shows a measuring device for ascertaining the temperature of a roller surface, according to an example embodiment of the present invention.
[0020] FIG. 2 shows a measuring device for ascertaining the temperature of a roller surface, as shown in FIG. 1, inserted in a recess of a roller body, according to an example embodiment of the present invention.
[0021] FIG. 3 shows a temperature sensor of a measuring device, according to an example embodiment of the present invention.
[0022] FIG. 4 shows the temperature sensor of FIG. 3 when the measuring device is inserted into a recess of a roller body, according to an example embodiment of the present invention.
DETAILED DESCRIPTION
[0023] FIG. 1 shows an example embodiment of a measuring device 10 of the present invention for ascertaining the temperature of a roller surface. The measuring device 10 has a first temperature sensor 21, a second temperature sensor 22, and additional temperature sensors 20. Additionally, measuring device 10 has a mounting rod 15. Temperature sensors 20-22 are situated on mounting rod 15 spaced apart from one another in the axial direction of mounting rod 15. Mounting rod 15 furthermore has supporting elements 30, which are likewise situated in the axial direction on both sides of each temperature sensor 20-22. Measuring device 10 furthermore has a sleeve 40, which is attached on one end 16 of mounting rod 15, on the front side of mounting rod 15. A processing unit 46, a wireless communication unit 42, and an energy supply unit 44 are situated in sleeve 40. Processing unit 46 can be a microcontroller for example. Processing unit 46 is connected to temperature sensors 20-22 via a cable that is not shown, for example a BUS cable, in order to be able to record temperature values from each one of temperature sensors 20-22. Processing unit 46 is furthermore connected to communication unit 42 and is designed to transmit the recorded temperature values via the communication unit 42. The communication unit 42 can be a Bluetooth or WLAN unit, for example. Both processing unit 46 as well as communication unit 42 are additionally connected to energy supply unit 44. Energy supply unit 44 can be an energy store such as a battery or an accumulator, for example. Alternatively or also as a combination, energy supply unit 44 can also be designed as an energy harvesting unit or can have energy supplied to it from outside, for example inductively.
[0024] In an example embodiment that is not shown, the measuring device can additionally have at least one acceleration sensor. On the basis of acceleration values recorded by the acceleration sensor it is possible to infer for example an operating state or a running time of the roller or also a bearing state of the roller such as an imbalance for example.
[0025] FIG. 2 shows the example embodiment of the measuring device of the present invention for ascertaining the temperature of a roller surface as shown in FIG. 1, which is inserted in a recess of a roller body 1 that has an axis of rotation 3, a roller surface 6, a front side 7, and a recess 4 on front side 7. Such a recess 4 can be a bore hole, for example. Recess 4 runs in particular parallel to axis of rotation 3 of roller body 1. In order to ascertain the temperature of roller surface 6 as precisely as possible, recess 4 is also situated as close as possible to roller surface 6 since thus the temperature of roller surface 6 approximately agrees with the temperature of an inner wall of recess 4. Measuring device 10, developed for example as shown in FIG. 1, is inserted into recess 4. Between the supporting elements 30, the mounting rod 15 is designed to be springy in such a way that each one of temperature sensors 20-22 is pressed onto inner wall 5 of recess 4 with a defined contact force F. Supporting elements 30 act as counter-bearings in the opposite direction of contact force F. The inserted measuring device thus stabilizes itself due to the design and mounting rod 15 is deformed in a wavelike shape. Contact force F can be adjusted on the one hand by the stiffness of mounting rod 15 and on the other hand by the spacing between supporting elements 30. Measuring device 10 is inserted in recess 4 in particular in such a way that temperature sensors 20-22 are pressed in the direction of roller surface 6, and supporting elements 30 are accordingly pressed in the direction of axis of rotation 3 of roller body 1. Sleeve 40 of measuring device 10 is additionally designed in such a way that it acts as a supporting element 30 for first temperature sensor unit 21. Sleeve 40 is furthermore designed in such a way that it fills recess 4 entirely, that is, in particular that a first cross section of sleeve 40 matches a second cross section of recess 4. Sleeve 40 in particular ends flush with front side 7 of roller body 1 and thus seals recess 4 vis-a-vis the outside.
[0026] In an example embodiment that is not shown, a cover element can also be provided that closes recess 4.
[0027] FIG. 3 shows an example embodiment of a temperature sensor of a measuring device according to an example embodiment of the present invention. Temperature sensors 20, 21, or also 22 are situated on mounting rod 15 as shown in FIG. 1. Temperature sensor 20, 21, or also 22 has an optional housing 29. Arranged inside housing 29 is a circuit board 23, on which in turn a temperature sensor element 24 is situated. Additionally, an evaluation circuit for example (not shown) can be situated on circuit board 23, which is designed for example as a bus-capable microcontroller having an individual identifier. Temperature sensor element 24, for example a Platinum measuring resistor, is connected to a contact element 27 via a spiral-shaped or s-shaped spring element 26. Contact element 27, spring element 26, and a guide element 28 form a spring contact 25. Guide element 28 is designed in such a way that it forms a guide for contact element 27, which is as a result movable only along an axis z perpendicular to a plane of circuit board 23. The contact force F shown in FIG. 2 also runs along axis z.
[0028] FIG. 4 shows the example embodiment of the temperature sensor, as shown in FIG. 3, of a measuring device, when the measuring device is inserted into a recess of the roller body, according to an example embodiment of the present invention. A temperature sensor 20, 21, or also 22 are shown as in FIG. 3. Contact force F, which is produced by mounting rod 15 and supporting elements 30 (not shown), presses temperature sensor unit 20, 21, or also 22 onto inner wall 5 of recess 4. Contact element 27 of spring contact 25 is thereby connected to inner wall 5 and is able to transmit the temperature from the latter via spring element 26 to temperature sensor element 24. For this reason, in particular contact element 27 and spring element 26 should be made from a material having good thermal conductivity.
[0029] In an example embodiment that is not shown, spring contact 25 has only one spring element 26, which transmits the temperature from inner wall 5 of recess 4 directly to temperature sensor element 24.
