JP2014172471A - Idle wheel device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an idle wheel device which can prevent lifting or idling of idle wheels, while suppressing enlargement of the idol wheel device.SOLUTION: An idle wheel device includes an idle wheel which rolls on magnetic rails and a magnet which is attached to the idle wheel to generate magnetic force between the idle wheel and the rail. The magnet is attached to the idle wheel so as to make the magnetic poles of the N pole and the S pole appear alternately on the outer edge part of the idle wheel, and the idle wheel device also includes a magnetic sensor which is arranged at a position close to the outer edge part of the idle wheel to detect the change of magnetic pole in the position, and computing means which computes rotation angle of the idle wheel based on the detected value detected by the magnetic sensor.

Description

  The present invention relates to an idler device for detecting a moving distance of a mobile device traveling on a rail.

  Since traveling of the mobile device traveling on the rail requires means for detecting the moving distance and speed, an idler device is attached to the vehicle body of the mobile device. Since the idle wheel contacts the rail and rolls as the vehicle body moves, the movement distance and speed are detected by transmitting the rotation of the idle wheel to a detection device such as an encoder.

  The travel distance can be detected when the idler is always in contact with the rail, but due to the deterioration of the condition of the rail contact surface, such as distortion of the rail, steps at the seam, dirt on the rail surface such as rainwater and dust, Slip may occur between the two and an error may occur in the original detection distance.

  In order to prevent floating of the idler and idling, it has been proposed to increase the contact surface pressure between the rail and the idler by increasing the weight of the idler.

  Further, as shown in FIGS. 10 and 11, Patent Document 1 discloses an idler device in which a spring 11 is provided between the idler device frame 1 and the vehicle body frame 12 to forcibly press the idler 20 against the rail 3. ing.

  Further, as shown in FIG. 12, Patent Document 1 discloses an idler device in which a permanent magnet 40 is disposed at a bottom portion of the idler device frame 1 with a gap formed between the rail 3 and presses the entire idler device against the rail 3. Yes.

Japanese Utility Model Publication No. 2-80063

  However, when the weight of the idler device is increased or when the spring mechanism shown in FIGS. 10 and 11 is added, the weight or the spring is attached, so that the size of the idler device is increased, the space for attachment to the vehicle body is secured, An increase in the number of maintenance objects due to the deterioration of the spring becomes a problem. Further, in the idler device shown in FIG. 12, since the attraction gap is large, it is necessary to enlarge and strengthen the magnet, which causes a problem of practicality.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an idler device that can prevent the idler wheel from rising or slipping while suppressing an increase in the size of the idler device. .

In order to achieve the above object, the present invention is an idler device,
A freewheel that rolls on a rail of magnetic material,
A magnet attached to the idler for generating a magnetic force between the idler and the rail;
It is characterized by providing.

  According to this invention, a magnet is attached to the idler rolling on the rail of the magnetic material, and a magnetic force is generated between the idler and the rail. Since the idle wheel and the rail are in contact with each other, an increase in the size of the magnet attached to the idle wheel can be suppressed. Therefore, according to the present invention, it is possible to provide an idler device that can prevent the idler wheel from rising or slipping while suppressing an increase in the size of the idler device.

It is a schematic diagram which shows the left side surface of the idler apparatus in Embodiment 1 of this invention. It is a schematic diagram which shows the back surface of the idler apparatus in Embodiment 1 of this invention. It is a schematic diagram which shows the cross section of the idler wheel in Embodiment 1 of this invention. It is the schematic diagram which looked at the idler wheel in Embodiment 1 of this invention. It is a schematic diagram which shows the left side surface of the idler apparatus in Embodiment 2 of this invention. It is a schematic diagram which shows the back surface of the idler apparatus in Embodiment 2 of this invention. It is a schematic diagram which shows an example of the periphery structure of the magnetic sensor in Embodiment 2 of this invention. It is a schematic diagram which shows the other example of the periphery structure of the magnetic sensor in Embodiment 2 of this invention. It is a figure for demonstrating the mechanism which detects the rotation direction of a freewheel with two magnetic sensors. It is a conceptual block diagram which shows the left side surface of the conventional idler device. It is a conceptual block diagram which shows the back surface of the conventional idler device. It is a conceptual lineblock diagram showing the left side of other conventional idler devices.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted.

Embodiment 1 FIG.
[Basic configuration]
The basic configuration of the first embodiment of the present invention will be described with reference to FIG. 1 and FIG.
FIG. 1 is a schematic diagram illustrating a left side surface of the idler device according to the first embodiment. FIG. 2 is a schematic diagram showing the back surface of the idler device according to the first embodiment.

  A vehicle body frame 12 shown in FIG. 1 is a vehicle body frame of a mobile device that travels on the rail 3. The mobile device is, for example, a truck that transports fuel such as coke in an iron manufacturing plant. The idler device frame 1 is attached to the vehicle body frame 12 via a link 10. An idler 2 is rotatably mounted in the idler device frame 1. The idler 2 rolls on the rail 3. As shown in FIG. 2, the rotation center axis of the idler wheel 2 is connected to the rotation axis of the rotation detector 9 via a coupling 8. Therefore, the rotation of the idle wheel 2 is transmitted to the rotation detector 9.

  The rotation detector 9 is an encoder. Since the encoder is well-known, a detailed description is omitted. For example, the rotation detector 9 includes a rotating shaft connected to the coupling 8, a magnetic disk rotating with the rotating shaft, and a magnetic field that changes due to the rotation of the disk. A magnetic encoder that outputs a pulse signal corresponding to rotation from the detection signal. In addition, the rotation detector 9 includes a rotating shaft connected to the coupling 8, a disk that rotates together with the rotating shaft and provided with a plurality of slits, and a sensor that detects light from a light source that passes through the slits by the rotation of the disk. It may be an optical encoder that outputs a pulse signal corresponding to the rotation from the detection signal.

[Characteristic configuration]
A characteristic configuration of the first embodiment of the present invention will be described with reference to FIGS.
FIG. 3 is a schematic diagram showing a cross section of the idler wheel 2 according to Embodiment 1 of the present invention. FIG. 4 is a schematic view of the idler wheel 2 according to the first embodiment of the present invention.

  The idler 2 and the rail 3 are magnetic bodies. Specifically, it is a ferromagnetic material. The idler device of the present invention has a characteristic configuration in which a magnet 4 is attached to the idler 2 to generate a magnetic force between the idler 2 and the rail 3. The magnet 4 is attached to the outer edge portion of the idler wheel 2. In the present specification, the outer edge portion includes a predetermined range (for example, several centimeters in thickness) from the outer peripheral surface toward the inner side (rotation center axis side). In the example shown in FIGS. 3 and 4, the idler wheel 2 has a shape (a cross section is C-shaped) provided with a depression or a hole on one side surface, and a plurality of magnets 4 are formed along the inner peripheral surface thereof. It is attached.

[Action / Effect]
In the configuration of the first embodiment as described above, the idler 2 rolls on the rail 3 as the mobile unit moves, and the rail 3 is made of a magnetic material such as carbon steel. By the magnetic flux generated from 4, an attractive force is generated between the rail 3 and the idler wheel 2, and the contact surface pressure with the rail 3 increases.

  According to the configuration of the present embodiment, since there is no gap between the magnet and the rail 3 as in the prior art (FIG. 12), an attractive force (magnetic force) is directly generated between the free wheel 2 and the rail 3. Therefore, it is possible to prevent the idler 2 from slipping without requiring an increase in the size and strength of the magnet.

  Further, according to the configuration of the present embodiment, unlike the prior art (FIGS. 10 and 11), since an external force such as a spring is not used, a space for attaching a spring mechanism is not required, and the idler device can be downsized. it can. Furthermore, it is possible to suppress an increase in maintenance targets due to spring deterioration.

[Modification]
By the way, in the idler apparatus of Embodiment 1 mentioned above, although the several magnet 4 is attached to the idler 2, it is not limited to this. As described above, it is sufficient if a magnetic force is generated between the free wheel 2 and the rail 3, and one magnet may be used.

  Moreover, in the idler apparatus of Embodiment 1 mentioned above, although attaching the magnet 4 to the inner side (rotation center axis | shaft side) rather than the outer peripheral surface was illustrated as an example of arrangement | positioning of the magnet to the outer edge part of the idler wheel 2, The mounting position is not limited to this. It is good also as attaching a magnet so that it may be exposed to an outer peripheral surface. This is the same as in the second embodiment.

  In the above-described idler device of the first embodiment, the idler 2 has a C-shaped cross section with a recess provided on one side surface, and the magnet 4 is provided on the inner peripheral surface formed by the recess. Although attached, the method of arrange | positioning the magnet 4 to the outer edge part of the idler | wheel 2 is not limited to this. It is good also as providing a some hole in the outer edge part of the idler wheel 2 side surface, and inserting the magnet 4 in each hole. Alternatively, the idler wheel 2 may be formed with the magnet 4 embedded in the outer edge of the idler wheel 2. This is the same as in the second embodiment.

Embodiment 2. FIG.
The above-described idler device of the first embodiment includes the rotation detector 9. Since the rotation detector 9 requires mechanical parts such as a rotating shaft and a disk in addition to the sensor, the number of parts is large and the size of the rotation detector 9 is also increased. If the number of parts is large, the possibility of failure increases, and if the size of the rotation detector 9 is large, the idler device frame 1 including the rotation detector 9 is also large, and the idler device is enlarged.

  Therefore, the second embodiment provides a freewheeling device that has a simple structure, a small size, and a robust structure without using the rotation detector 9 that has a large number of parts and is weak against vibration and shock.

[Characteristic configuration]
A characteristic configuration of the second embodiment of the present invention will be described with reference to FIGS.
FIG. 5 is a schematic diagram showing a left side surface of the idler device according to the second embodiment. FIG. 6 is a schematic diagram showing the back surface of the idler device according to the first embodiment.

  The configurations shown in FIGS. 5 and 6 are the same as those described in the first embodiment except that the arrangement configuration of the magnets 4 is different and that the magnetic sensor 6 is used instead of the coupling 8 and the rotation detector 9. Since it is the same as (FIGS. 1 to 4), the description of the common configuration is simplified or omitted.

  Similar to FIGS. 3 and 4 described above, the magnet 4 is attached to the inner peripheral surface of the outer edge of the idler wheel 2. In particular, in the second embodiment, the magnet 4 is attached so that the N-pole and S-pole magnetic poles appear alternately on the contact surface between the free wheel 2 and the rail 3.

  Further, as shown in FIG. 5, a magnetic sensor 6 is attached in the idler device frame 1. The magnetic sensor 6 is disposed at a position close to the outer edge of the idler wheel 2 and detects a change in the magnetic pole at that position.

  FIG. 7 is a schematic diagram illustrating an example of a peripheral configuration of the magnetic sensor 6 according to the second embodiment. The magnetic sensor 6 is connected to the comparator 7. The magnetic sensor 6 detects a change in the magnetic pole due to the rotation of the idler wheel 2. A signal indicating the change of the magnetic pole output from the magnetic sensor 6 is input to the comparator 7. The comparator 7 converts this into a pulse signal and outputs it. An arithmetic unit (not shown) calculates the rotation angle of the idler wheel 2 based on the pulse signal. Further, the rotation speed is calculated based on the rotation angle.

  FIG. 8 is a schematic diagram illustrating another example of the peripheral configuration of the magnetic sensor 6 according to the second embodiment of the present invention. In the example shown in FIG. 7, the magnetic sensor 6 is disposed at a position facing the outer peripheral surface of the idler wheel 2, but the position of the magnetic sensor 6 is not limited to this. The magnetic sensor 6 only needs to be at a position where the change of the magnetic pole due to the rotation of the idler 2 can be detected, and may be arranged at a position facing the outer edge of the side surface of the idler 2 as shown in FIG.

  By the way, it is preferable that the rotation direction of the free wheel 2 can be calculated. FIG. 9 is a diagram for explaining a mechanism for detecting the rotation direction of the free wheel by two magnetic sensors. The magnetic sensor 6 preferably comprises two sensors, magnetic sensors 6a and 6b. The magnetic sensors 6a and 6b are arranged so that the phase difference between the detection signals is 90 °. In the case of forward rotation, the combination of detection values of the magnetic sensors 6a and 6b at the same time is (S, N) → (N, N) → (N, S) → (S, S) → (S, N). It changes as follows. In the case of reverse rotation, it changes as (S, N) → (S, S) → (N, S) → (N, N) → (S, N). Thus, since the change pattern is different between forward rotation and reverse rotation, the rotation direction of the idler wheel 2 can be calculated.

[Action / Effect]
As described above, according to the configuration of the second embodiment, the idler wheel 2 itself replaces the mechanical parts such as the rotation shaft and the disk of the rotation detector 9, so that the coupling 8 and the rotation detection are provided in the idler device frame 1. It is not necessary to have mechanical parts such as the vessel 9. Further, as shown in FIG. 6, the idler device frame 1 can be downsized as compared with FIG. Therefore, the size of the idler device can be reduced.

  In addition, according to the configuration of the second embodiment, it is not necessary to attach the rotation detector 9 that is vulnerable to vibration and impact, and thus it is possible to realize an idler device that has a simple structure and is robust.

  In addition, according to the configuration of the second embodiment, the contact surface pressure between the free wheel 2 and the rail 3 can be increased by the magnet's attractive force, and the free wheel can be prevented from rising or slipping. It is possible to achieve the same effect as the configuration of the first embodiment described above.

[Modification]
By the way, in the configuration of the second embodiment described above, the rotation angle of the idler wheel 2 is calculated by detecting the change in the magnetic poles of the N pole and the S pole, but the calculation method of the rotation angle and the like is limited to this. Is not to be done. For example, using only one of the magnetic poles, the magnet 4 may be attached to the idler 2 so that magnetic fields of different strengths are alternately generated at the outer edge of the idler 2. By detecting a change in the strength of the magnetic field by the magnetic sensor 6, it is possible to calculate the rotation angle and the like.

1. Idler frame, 2. Idle wheel, 3. Rails, 4. Magnets, 5. Magnetic poles, 6. Magnetic sensor,
7). Comparator, 8. Coupling, 9. Rotation detector, 10. Link, 11. Spring, 12. Body frame

Claims (3)

A freewheel that rolls on a rail of magnetic material,
A magnet attached to the idler for generating a magnetic force between the idler and the rail;
An idler device comprising: The magnet is attached to the idler so that N-pole and S-pole magnetic poles appear alternately on the outer edge of the idler,
A magnetic sensor disposed at a position close to the outer edge of the idler wheel to detect a change in magnetic pole at the position;
Calculation means for calculating a rotation angle of the idler wheel based on a detection value detected by the magnetic sensor;
The idler device according to claim 1, further comprising: The magnet is attached to the idler so that different strength magnetic fields are alternately generated at the outer edge of the idler,
A magnetic sensor disposed at a position close to the outer edge of the idler wheel and detecting the strength of the magnetic field at the position;
Calculation means for calculating a rotation angle of the idler wheel based on a detection value detected by the magnetic sensor;
The idler device according to claim 1, further comprising:

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