Magnetic belt and magnetic sensing device

Abstract

A magnetic belt 10 used in a magnetic sensing device for measuring a rotationspeed of a rotation shaft (30, figure 1). The magnetic belt 10 comprises a belt body 11, on one surface of which a row of t

Description

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims the benefit of Chinese Patent Application No. CN202022850874.X filed on December 2, 2020 in the State Intellectual Property Office of China, the whole disclosure of which is incorporated herein by reference. BACKGROUND OF THE INVENTION Field of the Invention

[0002] The present invention relates to a magnetic belt and a magnetic sensing device comprising the magnetic belt. Description of the Related Art

[0003] In the prior art, a magnetic sensing device for measuring the rotational speed of a rotating shaft usually includes a gear and a Hall speed sensor. The gear is installed on the rotating shaft, and the Hall speed sensor is set near the gear. By sensing the changes of the peak and valley of the gear, the corresponding high and low level is output, so that the rotation speed of the gear and the shaft can be measured. But the gear is a precision machining part, the cost is very high, and it is difficult to install the gear on the rotating shaft. In addition, driving the gear to rotate requires more energy, and the space for installing the gear is also limited. SUMMARY OF THE INVENTION

[0004] The present invention has been made to overcome or alleviate at least one aspect of the above mentioned disadvantages.

[0005] According to an aspect of the present invention, there is provided a magnetic belt used in a magnetic sensing device for measuring a rotation speed of a rotation shaft, as defined in claim 1. The magnetic belt comprises a belt body, on one surface of which a row of toothed protrusions evenly spaced and arranged along a length direction of the belt body is formed. The belt body is adapted to be wound on or surround or encircle the rotation shaft to form a circle and fixed on the rotation shaft. When the belt body is wound and fixed on or surrounds or encircles the rotation shaft, the toothed protrusions are located on the outside of the magnetic belt and are evenly spaced 05 12 24 around the circumference of the rotation shaft.

[0006] The magnetic belt further comprises an end connecting device provided on two ends of the belt body and used to connect the two ends of the belt body.

[0007] The end connecting device comprises: two first connection pieces respectively fixed on two sides of one end of the belt body; two second connection pieces respectively fixed on two sides of the other end of the belt body; and two screws used to connect the two first connection pieces to the two second connection pieces respectively.

[0008] According to another exemplary embodiment of the present invention, the first connection piece and the second connection piece are respectively welded to both or respective ends of the belt body.

[0009] According to another exemplary embodiment of the present invention, a first threaded hole is formed in the first connection piece, a second threaded hole is formed in the second connection piece, and the screw is screwed into the first threaded hole and the second threaded hole to connect the first connection piece and the second connection piece.

[0010] According to another exemplary embodiment of the present invention, the belt body is a stamping forming part formed by stamping a flat magnetic material belt, so that the toothed protrusions on the belt body are toothed stamping protrusions.

[0011] According to another exemplary embodiment of the present invention, the length of the belt body of the magnetic belt is equal to the circumference of the rotation shaft, so that the belt body of the magnetic belt is just wound on the rotation shaft by a circle.

[0012] According to another aspect of the present invention defined in claim 6, there is provided a magnetic sensing device for measuring a rotation speed of a rotation shaft. The magnetic sensing device comprising: the above magnetic belt which is wound and fixed on the rotation shaft; and a magnetic induction or Hall sensor arranged near the magnetic belt and facing the magnetic belt. The magnetic induction or Hall sensor is adapted to sense a tooth peak formed by the toothed protrusion and a tooth valley formed by a gap between the toothed protrusions on the magnetic belt and output a high and low level signal corresponding to the tooth peak and the tooth valley. 05 12 24

[0013] According to an exemplary embodiment of the present invention, the magnetic sensing device further comprises a rotation speed calculating device adapted to calculate the rotation speed of the rotation shaft according to the following formula, n= 60 * F / m (1), in which n is the rotation speed of the rotation shaft, and the unit of which is rpm, F is the frequency of the level signal output by the magnetic induction or Hall sensor, and the unit of which is Hz, m is the number of the toothed protrusions on the magnetic belt.

[0014] According to another exemplary embodiment of the present invention, the Hall sensor is a Hall speed sensor.

[0015] In the aforementioned exemplary embodiments according to the present invention, the magnetic belt has simple structure and low cost. Moreover, the installation of the magnetic belt is very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other features of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the accompanying drawings, in which:

[0017] Fig.l is an illustrative perspective view of a magnetic sensing device according to an exemplary embodiment of the present invention;

[0018] Fig.2 shows a cross-sectional view of a rotation shaft surrounded by a magnetic sensing device according to an exemplary embodiment of the present invention;

[0019] Fig.3 is an illustrative view of the magnetic belt of the magnetic sensing device shown in Fig.l and Fig.2 laid out flat; and

[0020] Fig.4 is an illustrative view showing an end connecting device of a magnetic belt according to an exemplary embodiment of the present invention. DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE IVENTION

[0021] Exemplary embodiments of the present disclosure will be described hereinafter in detail with reference to the attached drawings, wherein the like reference numerals refer to the like elements. The present disclosure may, however, be embodied in many different forms and should not be construed as being limited to the embodiment set forth herein; rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the concept of the disclosure to those skilled in the art.

[0022] In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. It will be apparent, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are schematically shown in order to simplify the drawings.

[0023] According to a general concept of the present invention, there is provided a magnetic belt used in a magnetic sensing device for measuring a rotation speed of a rotation shaft. The magnetic belt comprises a belt body, on one surface of which a row of toothed protrusions evenly spaced and arranged along a length direction of the belt body is formed. The belt body is adapted to be wound on the rotation shaft to form a circle and fixed on the rotation shaft. When the belt body is wound and fixed on the rotation shaft, the toothed protrusions are located on the outside of the magnetic belt and are evenly spaced around the circumference of the rotation shaft.

[0024] Fig.l is an illustrative perspective view of a magnetic sensing device according to an exemplary embodiment of the present invention; Fig.2 shows a cross-sectional view of a rotation shaft surrounded by a magnetic sensing device according to an exemplary embodiment of the present invention; Fig.3 is an illustrative view of the magnetic belt 10 of the magnetic sensing device shown in Fig.l and Fig.2 laid out flat.

[0025] As shown in Figs. 1-3, in an embodiment, the magnetic belt 10 is used in a magnetic sensing device for measuring a rotation speed of a rotation shaft 30. The magnetic belt 10 comprises a belt body 11. A row of toothed protrusions 12 evenly spaced and arranged along a length direction of the belt body 11 is formed on one surface of the belt body 11. The belt body 11 is adapted to be wound on the rotation shaft 30 to form a circle and fixed on the rotation shaft 30. When the belt body 11 is wound and fixed on the rotation shaft 30, the toothed protrusions 12 are located on the outside of the magnetic belt 10 and evenly spaced around the circumference of the rotation shaft 30.

[0026] In an exemplary embodiment of the present invention, the magnetic belt 10 may be a seamless annular belt or an annular belt with both ends connected together.

[0027] Fig.4 is an illustrative view showing an end connecting device of a magnetic belt according to an exemplary embodiment of the present invention.

[0028] As shown in Figs. 1-4, in an embodiment, the magnetic belt further comprises an end connecting device 10a, 10b, 10c. The end connecting device 10a, 10b, 10c is provided on two ends of the belt body 11 and used to connect the two ends of the belt body 11.

[0029] As shown in Figs. 1-4, in an embodiment, the end connecting device 10a, 10b, 10c mainly comprises two first connection pieces 10a, two second connection pieces 10b and two screws 10c (only one of each of the first and second connection pieces and the screw are shown in Fig. 4). The two first connection pieces 10a are respectively fixed on two sides of one end of the belt body 11. The two second connection pieces 10b are respectively fixed on two sides of the other end of the belt body 11. The two screws 10c are used to connect the two first connection pieces 10a to the two second connection pieces 10b respectively.

[0030] As shown in Fig.4, in an embodiment, since the first connection pieces 10a and the second connection pieces 10b are located on the sides of the belt body, the continuity of the toothed protrusions 12 on the belt body 11 is not affected. The first connection pieces and the second connection pieces may for example be positioned on opposite sides of one or more of the protrusions the second connection piece 10b are welded to the two ends of the belt body 11 respectively.

[0032] As shown in Figs. 1-4, in an embodiment, a first threaded hole is formed in the first connection piece 10a, a second threaded hole is formed in the second connection piece 10b, and the screw 10c is screwed into the first threaded hole and the second threaded hole to connect the first connection piece 10a and the second connection piece 10b. Since each screw is provided with a nut, the holes of the connection pieces 10a and 10b may not be threaded.

[0033] As shown in Figs. 1-4, in an embodiment, the belt body 11 is a stamping forming part, formed by stamping a flat magnetic material belt, so that the toothed protrusions 12 on the belt body 11 are toothed stamping protrusions. In this way, it may greatly reduce the cost of the magnetic belt 10.

[0034] As shown in Figs. 1-4, in an embodiment, the length of the belt body 11 of the magnetic belt 10 is equal to the circumference of the rotation shaft 30, so that the belt body 11 of the magnetic belt 10 is just wound on the rotation shaft 30 to form a circle.

[0035] As shown in Figs. 1-4, in an exemplary embodiment of the present invention, there is also provided a magnetic sensing device for measuring a rotation speed of a rotation shaft 30. The magnetic sensing device mainly comprises the above magnetic belt 10 and a magnetic induction sensor 20. The magnetic belt 10 is wound around and fixed on the rotation shaft 30. The magnetic induction sensor 20 is arranged near the magnetic belt 10 and facing the magnetic belt 10. The magnetic induction sensor 20 is adapted to sense a tooth peak lOf formed by the toothed protrusion 12 and a tooth valley 10g formed by a gap between the toothed protrusions 12 on the magnetic belt 10 and output a high and low level signal corresponding to the tooth peak lOf and the tooth valley 10g.

[0036] As shown in Figs. 1-4, in an embodiment, the magnetic sensing device may further comprise a rotation speed calculating device. The rotation speed calculating device is adapted to calculate the rotation speed of the rotation shaft 30 according to the following formula, n= 60 * F / m (1), in which n is the rotation speed of the rotation shaft 30, and the unit of which is rpm, F is the frequency of the level signal output by the magnetic induction sensor 20, and the unit of which is Hz, m is the number of the toothed protrusions 12 on the magnetic belt 10. As shown in Figs. 1-4, in an embodiment, the magnetic induction sensor 20 may be a Hall speed sensor.

[0037] It should be appreciated by those skilled in this art that the above embodiments are intended to be illustrated, and not restrictive. For example, many modifications may be made to the above embodiments by those skilled in this art, and various features described in different embodiments may be freely combined with each other without conflicting in configuration or principle.

[0038] Although several exemplary embodiments have been shown and described, it would be appreciated by those skilled in the art that various changes or modifications may be made in these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the claims and their equivalents.

[0039] As used herein, an element recited in the singular and proceeded with the word "a" or "an" should be understood as not excluding plural said elements or steps, unless such exclusion is explicitly stated. Furthermore, references to "one embodiment" of the present invention are not intended to be interpreted as excluding the existence of additional embodiments that also incorporate the recited features. Moreover, unless explicitly stated to the contrary, embodiments "comprising" or "having" an element or a plurality of elements having a particular property may include additional such elements not having that property. 05 12 24

Claims

1. A magnetic belt used in a magnetic sensing device for measuring a rotation speed of a rotation shaft (30), wherein the magnetic belt (10) comprises:a belt body (11), on one surface of which a row of toothed protrusions (12) evenly spaced and arranged along a length direction of the belt body (11) is formed; andan end connecting device (10a, 10b, 10c) provided on two ends of the belt body (11) and used to connect the two ends of the belt body (11) together,wherein the belt body (11) is adapted to be wound on or encircle the rotation shaft (30) to form a circle and fixed on the rotation shaft (30),wherein when the belt body (11) is wound on or encircles the rotation shaft (30) and fixed thereon, the toothed protrusions (12) are located on an outside of the magnetic belt (10) and evenly spaced around the circumference of the rotation shaft (30), andwherein the end connecting device (10a, 10b, 10c) comprises:two first connection pieces (10a) respectively fixed on two sides of one end of the belt body (11);two second connection pieces (10b) respectively fixed on two sides of the other end of the belt body (11); andtwo screws (10c) used to connect the two first connection pieces (10a) to the two second connection pieces (10b) respectively.

2. The magnetic belt according to claim 1,wherein each first connection piece (10a) and each second connection piece (10b) is welded to a respective end of the belt body (11).

3. The magnetic belt according to claim 1 or 2,wherein a first threaded hole is formed in each first connection piece (10a), a second threaded hole is formed in each second connection piece (10b), and one said screw (10c) is screwed into the first threaded hole and the second threaded hole to connect the first connection piece (10a) and the second connection piece (10b).

4. The magnetic belt according to any preceding claim,wherein the belt body (11) is a stamp-formed part formed by stamping a flat magnetic05 12 24material belt, so that the toothed protrusions (12) on the belt body (11) are toothed stamped protrusions.

5. The magnetic belt according to any preceding claim,wherein the length of the belt body (11) of the magnetic belt (10) is equal to the circumference of the rotation shaft (30), so that the belt body (11) of the magnetic belt (10) is wound on the rotation shaft (30) to just form a circle.

6. Amagnetic sensing device for measuring a rotation speed of a rotation shaft (30), wherein the magnetic sensing device comprises:the magnetic belt (10) according to any one of claims 1-5, wherein the magnetic belt (10) is wound on or encircles the rotation shaft (30) and is fixed thereon; anda magnetic induction or Hall sensor (20) arranged near the magnetic belt (10) and facing the magnetic belt (10),wherein the magnetic induction or Hall sensor (20) is adapted to sense a tooth peak (1 Of) formed by the toothed protrusion (12) and a tooth valley (10g) formed by a gap between the toothed protrusions (12) on the magnetic belt (10) and output high and low level signals respectively corresponding to the tooth peak (lOf) and the tooth valley (10g).

7. The magnetic sensing device according to claim 6, further comprising:a rotation speed calculating device adapted to calculate the rotation speed of the rotation shaft (30) according to the following formula,n= 60 * F / m (1), in whichn is the rotation speed of the rotation shaft (30), and the unit of which is rpm,F is the frequency of the level signal output by the magnetic induction sensor (20), and the unit of which is Hz, andm is the number of the toothed protrusions (12) on the magnetic belt (10).

8. The magnetic sensing device according to claim 6 or 7, wherein the Hall sensor (20) is a Hall speed sensor.

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