Roller rotational speed detection device and rolling mill

Abstract

The utility model provides a kind of roll rotational speed detection device and rolling mill, wherein the roll rotational speed detection device includes the fixed piece of the outer circumferential side of one end of roll detachable fixed, multiple conductors and electric eddy current sensor that are fixed to the outer surface of the fixed piece at intervals;The detection surface of the electric eddy current sensor is opposite and spaced with the outer side of the fixed piece.The roll rotational speed detection device in the utility model not only can be conveniently installed and fixed, and can make it not be influenced by various environments, so as to improve its detection accuracy.

Description

Technical Field

[0001] This utility model relates to the field of aluminum foil production technology, and in particular to a rolling mill speed detection device and a rolling mill. Background Technology

[0002] In the production of aluminum foil, the rolling process is a key step, and the speed control of the rolls in the rolling mill is an even more critical step, because controlling the speed of the rolls in the rolling mill can result in better quality aluminum foil.

[0003] In order to better control the rotational speed of the rolls in the rolling mill, it is necessary to monitor the rolls in the rolling mill in real time to achieve the effect of real-time and precise control.

[0004] In the existing technology, the main methods for detecting the rotational speed of the rolls in the rolling mill are photoelectric encoders and magnetic encoders. Although these methods can detect the rotational speed of the rolls in the rolling mill, they all have certain limitations, such as complex installation, susceptibility to dust pollution, and stringent environmental requirements.

[0005] When the aforementioned devices are used but not installed properly or in environments with high temperature, humidity, or high dust levels, the existing methods for detecting the rotational speed of the rolls in the rolling mill will lead to reduced detection accuracy. This makes it impossible to accurately control the rotational speed of the rolls in the rolling mill, ultimately resulting in poor quality aluminum foil produced. Utility Model Content

[0006] To address the shortcomings of the existing technologies, this utility model proposes a roll speed detection device and a rolling mill, thereby solving the problem that the methods used in related technologies to detect the speed of rolls in rolling mills are easily affected by the environment, resulting in low detection accuracy.

[0007] In a first aspect, this utility model provides a roll speed detection device for detecting the speed of a rolling mill roll. It includes a ring-shaped fixing member detachably fixed to the outer periphery of one end of the roll, a plurality of conductive bodies spaced apart and fixed to the outer surface of the fixing member, and an eddy current sensor. The detection surface of the eddy current sensor faces and is spaced apart from the outer surface of the fixing member. The eddy current sensor is used to detect the magnetic field change caused by the eddy current effect generated by the conductive bodies and converts the magnetic field signal into a speed signal.

[0008] Preferably, the fastener is a clamp.

[0009] Preferably, the conductor is an iron conductor, and the thickness of the conductor is 8-12 mm.

[0010] Preferably, the conductor is fixed to the outer surface of the fastener by welding.

[0011] Preferably, a plurality of the conductors are disposed at equal intervals on the outer surface of the fixing member.

[0012] Preferably, when any one of the conductors is directly opposite the detection surface of the eddy current sensor, the distance between the side of the conductor facing the detection surface of the eddy current sensor away from the fixing member and the detection surface of the eddy current sensor is less than or equal to 3 mm.

[0013] Preferably, the roll speed detection device further includes a mounting bracket for fixing to the inner side of the mill frame; the eddy current sensor is fixed to the mounting bracket.

[0014] Preferably, the eddy current sensor includes a preamplifier, a probe, and an excitation coil and a probe coil fixed inside the probe and spaced apart from each other; the probe and the preamplifier are connected by a cable, the excitation coil is used to generate an alternating magnetic field, the probe coil is used to detect the magnetic field change caused by the eddy current effect generated by the conductor, and the preamplifier is used to convert the magnetic field signal into a rotational speed signal.

[0015] Preferably, the preamplifier includes an oscillator, a detection circuit, and an amplifier connected in sequence. The oscillator is connected to the probe via the cable. The oscillator is used to generate a reference signal. The detection circuit is used to detect the displacement of the conductor by detecting changes in the inductive reactance of the detection coil. The amplifier is used to amplify the displacement signal.

[0016] Secondly, this utility model provides a rolling mill, which includes a frame, rolls disposed within the frame, and a plurality of roll speed detection devices, wherein the rolls are rotatably connected to the frame; the rolls include deflector rolls and guide rolls, and the fixing members in the plurality of roll speed detection devices are detachably fixed to the deflector rolls and the guide rolls, respectively.

[0017] Compared with the prior art, the roll speed detection device of this utility model has a detachable and ring-shaped fixing component designed on the outer periphery of one end of the roll, and multiple conductors designed on the outer surface of the fixing component. Finally, an eddy current sensor is designed to be opposite to the fixing component and spaced apart. This not only facilitates the installation and fixing of the roll speed detection device, but also makes it unaffected by various environmental factors, thereby improving the detection accuracy of the roll speed detection device. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0019] Figure 1 A three-dimensional structural schematic diagram of the roll speed detection device provided in this embodiment of the utility model;

[0020] Figure 2 A schematic diagram of the structure of the roll speed detection device after it is installed on the roll according to an embodiment of this utility model;

[0021] Figure 3 This is a schematic diagram of the conductor and eddy current sensor in the roll speed detection device provided in this embodiment of the utility model.

[0022] Among them, 100, roll speed detection device; 1, fixture; 2, conductor; 3, eddy current sensor; 31, preamplifier; 311, oscillator; 312, detection circuit; 313, amplifier; 32, probe; 33, probe coil; 34, cable; 4, mounting bracket; 5, roll. Detailed Implementation

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application, are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0024] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0025] It should be noted that the terms "above," "below," "left," and "right" mentioned in the embodiments of this utility model are used to describe the placement state in the accompanying drawings and should not be interpreted as limiting embodiments of this utility model. Furthermore, it should be understood that, in the text, when referring to an element that constitutes "above" or "below" another element, it is possible that the element directly constitutes "above" or "below" the other element, or it is possible that the element constitutes "above" or "below" the other element through an intermediate element.

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example 1

[0028] This utility model embodiment provides a roll speed detection device 100, combined with... Figure 1 and Figure 2 As shown, it includes a ring-shaped fixing member 1 that is detachably fixed to the outer periphery of one end of the roll 5, a plurality of conductors 2 that are fixed at intervals to the outer surface of the fixing member 1, and an eddy current sensor 3; the detection surface of the eddy current sensor 3 is directly opposite to and spaced from the outer surface of the fixing member 1, and the eddy current sensor 3 is used to detect the magnetic field change caused by the eddy current effect generated by the conductors 2, and convert the magnetic field signal into a rotation speed signal.

[0029] The roll speed detection device 100 is used to detect the speed of the rolls 5 of the rolling mill; the eddy current sensor 3 is fixed to the inner side of the mill frame.

[0030] In this embodiment, the fixing member 1 is a clamp. Using a clamp not only facilitates the fixing of the conductor 2 to the roll 5, but also makes it easier to assemble and disassemble the fixing member 1, simplifying future maintenance and preventing the roll 5 from being affected. Of course, depending on actual needs, the fixing member 1 can also be other types, such as an elastic shrink ring.

[0031] The conductor 2 is fixed to the outer surface of the fixing member 1 by welding. This design allows the conductor 2 to be quickly and accurately fixed to the designated position on the roll 5, reducing the time required for adjustment and alignment.

[0032] Multiple conductors 2 are evenly spaced on the outer surface of the fixing member 1. This allows for better positioning of the reference surface of the roll 5 and improves detection accuracy.

[0033] The conductor 2 is made of ferrous material and has a thickness of 8-12 mm; preferably, the thickness is 10 mm. This design improves the magnetic permeability of the conductor 2, thereby enhancing the eddy current effect between the conductor 2 and the eddy current sensor 3, thus improving the sensitivity of the eddy current sensor 3, and is easy to process and install. Of course, depending on actual needs, the conductor 2 can also be made of other conductive metal materials and have other thicknesses, such as copper or copper alloys, and thicknesses of 6 mm, 7.5 mm, or 13 mm.

[0034] When any conductor 2 is directly opposite the detection surface of the eddy current sensor 3, the distance between the side of the conductor 2 facing away from the fixing member 1 and the detection surface of the eddy current sensor 3 is less than or equal to 3 mm. Because the distance between the eddy current sensor 3 and the conductor 2 is a critical parameter that directly affects measurement accuracy, this design ensures sufficient signal strength and resolution between the eddy current sensor 3 and the conductor 2.

[0035] In this embodiment, as Figure 1 As shown, the conductor 2, also called the induction sheet, consists of eight conductors that are fixed at equal intervals to the outer periphery of the fixing member 1. Of course, the number of conductors 2 can be adjusted according to actual needs, such as designing four, five, six, seven, nine, ten, etc.

[0036] like Figure 3 As shown, the eddy current sensor 3 includes a preamplifier 31, a probe 32, and an excitation coil (not shown) and a probe coil 33 that are fixed in the probe 32 and spaced apart from each other. The probe 32 is connected to the preamplifier 31 by a cable 34. The excitation coil is used to generate an alternating magnetic field, the probe coil 33 is used to detect the change in magnetic field caused by the eddy current effect generated by the conductor 2, and the preamplifier 31 is used to convert the magnetic field signal into a rotational speed signal.

[0037] The preamplifier 31 includes an oscillator 311, a detection circuit 312, and an amplifier 313 connected in sequence. The oscillator 311 is connected to the probe 32 via a cable 34. The oscillator 311 is used to generate a reference signal. The detection circuit 312 is used to detect the displacement of the conductor 2 by detecting the change in inductive reactance of the detection coil. This displacement can be expressed as rotational speed. The amplifier 313 is used to amplify the displacement signal or the rotational speed signal.

[0038] The probe coil 33 is used to detect the magnetic field change caused by the eddy current effect generated by the conductor 2. The excitation coil is located inside the probe 32 and is used to generate an alternating magnetic field. The preamplifier 31 is used to convert the signal in the probe coil 33 into a usable output signal.

[0039] The working principle of the eddy current sensor 3 is as follows: when an alternating current passes through the excitation coil, an alternating magnetic field is generated around it. When the conductor 2 approaches this magnetic field, according to Faraday's law of electromagnetic induction, an induced electromotive force is generated in the conductor 2, thereby forming eddy currents. These eddy currents flow in the conductor 2 and form a closed loop on the surface of the conductor 2. According to Lenz's law, the eddy currents generate a reverse magnetic field. This reverse magnetic field cancels the original magnetic field generated by the excitation coil and has a certain magnetic flux. Therefore, the impedance of the excitation coil will change, and the change in magnetic field will be converted into an electrical signal, amplified, and then converted into a digital signal. The electrical signal and digital signal here are manifested as the speed signal, and finally transmitted to the external control system through the cable 34.

[0040] Of course, depending on the actual needs, the eddy current sensor 3 can also be selected with a conventional structure, such as the structure of the eddy current sensor as found in the Sogou Encyclopedia search term, or the eddy current sensor with application number CN113607264A, etc.

[0041] The roll speed detection device 100 also includes a mounting bracket 4 for fixing to the inner side of the mill stand; the eddy current sensor 3 is fixed to the mounting bracket 4. This design allows the detection surface of the eddy current sensor 3 to be aligned with and spaced apart from the outer side of the fixing member 1.

[0042] Compared with existing technologies, the roll speed detection device 100 in this embodiment features a detachable, ring-shaped fixing member 1 on the outer periphery of one end of the roll 5, multiple conductive bodies 2 on the outer surface of the fixing member 1, and eddy current sensors 3 positioned opposite and spaced apart from the fixing member 1. This design not only facilitates the installation and fixation of the roll speed detection device 100 but also prevents it from being affected by various environmental factors, thereby improving the detection accuracy of the roll speed detection device 100. Furthermore, this roll speed detection device 100 achieves non-contact detection, has strong anti-interference capabilities, reliable installation, and fast response speed, making it suitable for online detection under various complex working conditions and reducing maintenance costs after long-term use. When applied to the roll 5 of a rolling mill, it can also compare the speed of the roll 5 with the speed of the spindle to avoid scratches and large pinholes on the aluminum foil surface caused by roll 5 slippage.

[0043] Example 2

[0044] This embodiment provides a rolling mill, which includes a frame, rolls 5 disposed in the frame, and multiple roll speed detection devices 100 as described in Embodiment 1 above. The rolls 5 are rotatably connected to the frame. The rolls 5 include deflector rolls and guide rolls. The fixing members 1 in the multiple roll speed detection devices 100 are detachably fixed to the deflector rolls and guide rolls, respectively.

[0045] Since the rolling mill in this embodiment includes the roll speed detection device 100 in the first embodiment above, it can also achieve the same technical effect as the roll speed detection device 100 in the first embodiment above, which will not be described in detail here.

[0046] It should be noted that the various embodiments described above with reference to the accompanying drawings are merely illustrative of the present invention and not intended to limit its scope. Those skilled in the art should understand that any modifications or equivalent substitutions made to the present invention without departing from its spirit and scope should be covered within the scope of the present invention. Furthermore, unless the context otherwise requires, singular terms include plural forms, and vice versa. Additionally, unless specifically stated otherwise, all or part of any embodiment may be used in conjunction with all or part of any other embodiment.

Claims

1. A roll speed detection device for detecting the speed of rolls in a rolling mill, characterized in that, The roll speed detection device includes a ring-shaped fixing member for detachably fixing to the outer periphery of one end of the roll, a plurality of conductive bodies fixed at intervals to the outer surface of the fixing member, and an eddy current sensor; the detection surface of the eddy current sensor is directly opposite to and spaced apart from the outer surface of the fixing member, and the eddy current sensor is used to detect the magnetic field change caused by the eddy current effect generated by the conductive bodies, and convert the magnetic field signal into a speed signal.

2. The roll speed detection device as described in claim 1, characterized in that, The fastener is a clamp.

3. The roll speed detection device as described in claim 1, characterized in that, The conductor is an iron conductor with a thickness of 8-12 mm.

4. The roll speed detection device as described in claim 1, characterized in that, The conductor is fixed to the outer surface of the fastener by welding.

5. The roll speed detection device as described in claim 1, characterized in that, Multiple conductors are equally spaced on the outer surface of the fixing member.

6. The roll speed detection device as described in claim 1, characterized in that, When any one of the conductors is directly opposite the detection surface of the eddy current sensor, the distance between the side of the conductor facing the detection surface of the eddy current sensor away from the fixing member and the detection surface of the eddy current sensor is less than or equal to 3 mm.

7. The roll speed detection device as described in claim 1, characterized in that, The roll speed detection device also includes a mounting bracket for fixing to the inner side of the mill frame; the eddy current sensor is fixed to the mounting bracket.

8. The roll speed detection device as described in claim 1, characterized in that, The eddy current sensor includes a preamplifier, a probe, and an excitation coil and a probe coil fixed inside the probe and spaced apart from each other. The probe and the preamplifier are connected by a cable. The excitation coil is used to generate an alternating magnetic field. The probe coil is used to detect the magnetic field change caused by the eddy current effect generated by the conductor. The preamplifier is used to convert the magnetic field signal into a rotational speed signal.

9. The roll speed detection device as described in claim 1, characterized in that, The preamplifier includes an oscillator, a detection circuit, and an amplifier connected in sequence. The oscillator is connected to the probe via a cable. The oscillator is used to generate a reference signal. The detection circuit is used to detect the displacement of the conductor by detecting changes in the inductive reactance of the detection coil. The amplifier is used to amplify the displacement signal.

10. A rolling mill, characterized in that, The rolling mill includes a frame, rolls disposed within the frame, and a plurality of roll speed detection devices as described in any one of claims 1 to 9, wherein the rolls are rotatably connected to the frame; the rolls include deflector rolls and guide rolls, and the fixing members in the plurality of roll speed detection devices are detachably fixed to the deflector rolls and the guide rolls, respectively.

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