JP2818496B2 - Rail grinding control method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for controlling rail grinding, and more particularly to a technique which is effective when applied to control of pressing a grinding wheel against a rail head.

[0002]

2. Description of the Related Art Due to the wavy wear generated on the rail head,
There is a problem that noise and vibration are generated, which not only adversely affects passengers and residents along the road, but also damages overhead lines, vehicle motors, bogies, and the like. Recently, it has become necessary to grind the stepped abrasion of 100 mm before and after the rail joint and uneven deformation of the welded portion of the long rail. Therefore, a rail grinding control device has been proposed.
And JP-A-62-156404.

That is, in each of the rail grinding control devices described in the above-mentioned publications, a plurality of grinding tools, each of which is formed by sequentially connecting a hydraulic cylinder, a grinder motor, and a grindstone to a main body of the device, are arranged in correspondence with two rails. A hydraulic circuit equipped with hydraulic cylinders with different pressure receiving areas on the upper and lower sides of the piston and a pressure adjusting valve for adjusting the pressure is provided. It is intended to be.

[0004]

However, in the structure of the conventional rail grinding control device described above, each of the above-mentioned devices has a hydraulic cylinder having a different pressure receiving area on the upper and lower sides of the piston, and a pressure adjusting valve for adjusting the pressure. Since the hydraulic circuit is provided, and the difference between the upward force generated by the difference in the pressure receiving area on the upper and lower sides of the piston and the own weight of the grinding tool determines the pressurization of the grindstone against the rail head, the grindstone It is not possible to cope with changes in the weight of the grinding tool due to wear of the grinding tool and changes in the frictional resistance of the guide cylinder of the grinding tool. was there.

[0005] In addition, the structure of the conventional rail grinding control device is provided with a hydraulic circuit that uses a hydraulic pressure as a fluid, so that the structure is complicated, and therefore the cost is high. There was a problem that maintenance was difficult.

An object of the present invention is to provide a rail grinding control method and apparatus capable of performing constant pressure grinding by air pressure and improving grinding accuracy.

It is another object of the present invention to provide a rail grinding control method and apparatus capable of simplifying the structure and reducing the cost and facilitating maintenance.

The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0009]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows.

[0010] That is, the rail grinding control device of the present invention is a rail grinding control device in which a plurality of grinding tools, which are formed by sequentially connecting a pneumatic cylinder, a grinder motor and a grindstone to a main body of the device, are arranged corresponding to the rails. hand,
Detecting means for detecting a load current of the grinder motor; an electropneumatic converter for controlling a secondary air pressure supplied / discharged to / from the pneumatic cylinder to a set pressure corresponding to an input signal; A control means for increasing / decreasing the input signal of the electropneumatic converter and controlling the pressing of the grindstone to the rail head to a constant value is provided.

[0011]

In the above configuration, when performing rail grinding control, the load current of the grinder motor is detected, and the input signal of the electropneumatic converter is increased or decreased based on the detection signal. By increasing or decreasing the input signal, the secondary side air pressure of the electropneumatic converter, that is, the air pressure in the cylinder chamber of the pneumatic cylinder, is made to correspond to a change in the weight of the grinding tool due to wear of the grindstone and a change in the frictional resistance of the guide cylinder of the grinding tool. Control continuously. Thereby, the pressing of the grindstone to the rail head can be controlled to be constant. Therefore, the above problem can be eliminated.

[0012]

FIG. 1 is a circuit diagram showing a rail grinding control device according to an embodiment of the present invention. Note that the essential parts of the circuit shown in FIG. 1 are provided for each of the rail grinding wheels, so that the explanation of the essential parts of the other circuits will be omitted.

The rail grinding control device in the present embodiment is
It has a pneumatic circuit 1. The pneumatic circuit 1 includes a compressor 2, and a filter 3,
A structure in which the mist filter 4 and the manual regulator 5 are sequentially connected to the downstream side, and the air pressure purified and adjusted by the filters 3 and 4 and the manual regulator 5 is supplied to various pneumatic devices via the main flow path 6. It has become.

That is, an electromagnetic valve 7 is connected to the main flow path 6, and the electromagnetic valve 7 has a function of controlling the supply of pilot pressure to the air-operated valve 8.
The primary and secondary ports P, A are in communication with each other at the operating position 15 and the primary pressure from the main flow path 6 is used as the pilot pressure at the air-operated valve 8 at the operating position 15. It is a structure supplied to.

An electropneumatic regulator (electropneumatic converter) 10 is connected to the main flow path 6, and the electropneumatic regulator 10 is a pilot-type high relief regulator unit 10.
a and a control unit 11. The control unit 11 has a built-in small high-speed two-port valve on the supply side or the exhaust side.
Based on the feedback from the pressure sensor that monitors the secondary pressure, the control unit 11 supplies electricity to the small high-speed two-port valve on the supply or exhaust side with a pulse width corresponding to the difference between the set pressure and the secondary pressure. And a function of adjusting the pilot pressure of the high relief regulator section 10a and controlling the secondary pressure.

The high relief regulator 1
0a has a relief-type structure, and has a relief hole 12, and when the secondary side air pressure becomes equal to or higher than the air pressure set by the control unit 11, the secondary side excess air pressure from the relief hole 12 into the atmosphere. Is to be exhausted.

The air actuated valve 8 supplies the primary pressure from the main flow path 6 to the secondary side by supplying / discharging the pilot pressure from the solenoid valve 7 or reduces the secondary side air pressure of the electropneumatic regulator 10. In the normal position 9, the primary port Pa and the secondary port A communicating with the main flow path 6 communicate with each other at the normal position 9. The primary side port Pb communicating with is closed and the operation position 15
In this configuration, the primary port Pa communicating with the main flow path 6 is closed, and the primary port Pb communicating with the electropneumatic regulator 10 and the secondary port A communicate with each other.

The speed controller 13 has a flow control valve 16 and a check valve 17, and has a limit switch 18 mounted thereon. The check valve 17 has a function of allowing the flow of air pressure to the secondary side and blocking the flow to the primary side. The flow control valve 16 is controlled by a handle. 18 ON
It has the function of ON of this limit switch 18
Accordingly, the relay 19 has a function of turning off the control power of the solenoid 7a of the solenoid valve 7.

The pneumatic cylinder 14 reduces the pressure applied by its own weight, such as a grinder motor 21 provided at the lower end of the piston rod 20 and a grindstone 23 attached to the rotating shaft 22 thereof. The grindstone 23 is horizontally opposed to the rail head 24 and has a diameter larger than the short wavelength of the wavy wear.

The cylinder chamber 25 in the pneumatic cylinder 14 is partitioned by a piston 32 into a lower cylinder chamber 25a and an upper cylinder chamber 25b. The upper cylinder chamber 25b communicates with the atmosphere via a muffler 26, and the lower cylinder chamber 25a It is connected to the secondary port A of the air-operated valve 8 via the speed controller 13, and the air pressure in the lower cylinder chamber 25a raises the grindstone 23 against its own weight of the grinding tool 33 or reduces the pressurization by its own weight. Thus, the pressing of the grindstone 23 against the rail head 24 is controlled.

Next, a control circuit 31 for controlling the pressurization of the grindstone 23 will be described.

A current transformer (detection means) 27 for detecting a load current of the grinder motor 21 is disposed in the U phase wired to the grinder motor 21.

A converter 28 is connected to the current transformer 27, and the converter 28 has a function of converting a detection signal from the current transformer 27 into a measurement control signal.

On the other hand, the control unit 11 of the electropneumatic regulator 10 has a power supply 29 for supplying power to its coil.
And a digital indicating controller (control means) 30.

The digital indicating controller 30 includes a converter 2
Electropneumatic regulator 10 based on the measurement control signal from
To the secondary side air pressure of the electropneumatic regulator 10, that is, the lower cylinder chamber 25 of the pneumatic cylinder 14.
The air pressure in a is continuously controlled while corresponding to the change in the weight of the grinding tool 33 due to the wear of the grindstone 23 and the change in the frictional resistance of the guide cylinder of the grinding tool 33, and pressurization of the grindstone 23 against the rail head 24. It has a structure that controls it constantly.

Next, the operation in the case where the rail grinding control is performed using the rail grinding control device having the above configuration will be described.

In the state before the start of rail grinding, as shown in FIG. 1, in the speed controller 13, the flow control valve 16 is fully closed, the limit switch 18 is in the ON state, and in the solenoid valve 7, the Due to the ON state of the limit switch 18 and the OFF state of the relay 19, the solenoid 7a is in the OFF state.

Therefore, the pilot pressure is not supplied due to the closing of the primary and secondary ports P and A at the normal position 9, so that the air-operated valve 8 has the primary and secondary sides at the normal position 9. Port Pa, A
, The original pressure from the main flow path 6 is supplied to the lower cylinder chamber 25a of the pneumatic cylinder 14 via the check valve 17 of the speed controller 13, and the piston rod 2
With 0, the grinder motor 21 and the grindstone 23 rise against their own weight and are separated from the rail head 24.

Next, when starting the rail grinding from such a state before the start of the rail grinding, the grinder motor 21 and the switch of the grinding travel are respectively turned ON, and the flow control valve 16 of the speed controller 13 is operated with the handle while releasing the lock. When the limit switch 18 is turned off and the relay 19 is turned on, the solenoid valve 7 is opened.
Is turned ON, and the pilot pressure is supplied to the air-operated valve 8 by the communication between the primary and secondary ports P and A at the operating position 15. In the pneumatic valve 8, the electropneumatic regulator 1 at the operating position 15 is supplied by the pilot pressure.
0, the primary port Pb and the secondary port A communicate with each other, so that the lower cylinder chamber 2 of the pneumatic cylinder 14
Reference numeral 5a communicates with the electropneumatic regulator 10 via the flow control valve 16 in a half-open state of the speed controller 13.

Since the grinder motor 21 is in a no-load state, this is detected by the current transformer 27,
Based on this detection signal, the electropneumatic regulator 10 is in a state where it can be exhausted from the relief hole 12. Therefore, the air pressure in the lower cylinder chamber 25a of the pneumatic cylinder 14 is narrowed by the flow control valve 16 in a half-open state of the speed controller 13, and is gradually exhausted, and the grindstone 23 descends gradually.

When the flow control valve 16 of the speed controller 13 is fully opened after the grinding stone 23 hits the rail head 24, rail grinding control is performed through the following process.

That is, at the time of rail grinding control, the current transformer 27 detects the load current of the grinder motor 21, and this detection signal is converted into a measurement control signal by the converter 28. Based on the measurement control signal, the digital indicating controller 30 increases or decreases the input signal of the control unit 11 of the electropneumatic regulator 10, and increases or decreases the input signal, thereby controlling the secondary air pressure of the electropneumatic regulator 10, that is, the pneumatic cylinder 14. Air pressure in the lower cylinder chamber 25a of the grinding wheel 2
Of the weight of the grinding tool 33 due to wear of the grinding tool 3 and the grinding tool 3
The control is continuously performed while corresponding to the change in the frictional resistance of the guide cylinder of No. 3.

More specifically, when the pressing force of the grindstone 23 against the rail head 24 increases due to a change in the weight of the grinding tool 33 or a change in the frictional resistance of the guide cylinder of the grinding tool 33, the load current of the grinder motor 21 increases. In response to this increase in the load current, the secondary air pressure of the electropneumatic regulator 10, that is, the air pressure in the lower cylinder chamber 25a of the pneumatic cylinder 14 is controlled to increase. Therefore, the rail head 2
Pressing of the grindstone 23 against 4 decreases.

The change in the weight of the grinding tool 33 and the grinding tool 33
When the pressing force of the grindstone 23 on the rail head 24 decreases due to the change in the frictional resistance of the guide cylinder, the pressing force of the grindstone 23 on the rail head 24 increases by a process reverse to that described above. Therefore, the pressing of the grindstone 23 to the rail head 24 can be controlled to be constant.

As a result, it is possible to perform horizontal grinding at the same level as in the case of stereotactic grinding for wavy wear having a wavelength equal to or less than the diameter of the grindstone 23, thereby improving grinding accuracy.

Further, since the rail grinding control device has a structure having a pneumatic circuit provided with the electropneumatic regulator 10, not only can the structure be simplified, but also the structure can be simplified.
The cost can be significantly reduced as compared with the conventional example, and the maintenance can be facilitated.

Although the invention made by the inventor has been specifically described based on the embodiments, the present invention is not limited to the above-described embodiments, and can be variously modified without departing from the gist thereof. Needless to say.

For example, in this embodiment, the case where the electro-pneumatic regulator is used as the electro-pneumatic converter has been described. However, the present invention is not limited to this, and the electro-pneumatic proportional valve and the electro-pneumatic servo valve may be used as the electro-pneumatic converter. it can.

In this embodiment, the rail grinding control method and apparatus for automatically grinding the flat surface of the rail head have been described. However, the present invention is not limited to this. The present invention can also be applied to a control method and its device.

[0040]

Advantageous effects obtained by typical ones of the inventions disclosed in the present application will be briefly described.
It is as follows.

(1) The load current of the grinder motor is detected, the input signal of the electropneumatic converter is increased or decreased based on the detected signal, and the secondary air pressure supplied to and discharged from the pneumatic cylinder is reduced by the grinding tool due to the wear of the grinding wheel. The structure is such that it is continuously controlled while responding to changes in its own weight or the like, so that the pressing of the grindstone against the rail head can be controlled to be constant.

(2) As shown in the above (1), the pressing of the grindstone against the rail head can be controlled to be constant.
Grinding is performed horizontally at the same level as in the case of stereotactic grinding for wavy wear having a wavelength equal to or less than the diameter of the grindstone, thereby improving grinding accuracy.

(3) Since the structure has the pneumatic circuit provided with the electropneumatic converter, not only the structure can be simplified, but also the cost is significantly reduced as compared with the conventional example. And maintenance can be facilitated.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a rail grinding control device according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pneumatic circuit 2 Compressor 3 Filter 4 Mist filter 5 Manual regulator 6 Main flow path 7 Solenoid valve 7a Solenoid part 8 Air operated valve 9 Normal position 10 Electropneumatic regulator 10a High relief regulator part 11 Control part 12 Relief hole 13 Speed controller 14 Pneumatic cylinder 15 Working Position 16 Flow Control Valve 17 Check Valve 18 Limit Switch 19 Relay 20 Piston Rod 21 Grinder Motor 22 Rotary Shaft 23 Grindstone 24 Rail Head 25 Cylinder Chamber 25a Lower Cylinder Chamber 25b Upper Cylinder Chamber 26 Muffler 27 Current Transformer (Detection Means) 28 Converter 29 Power supply 30 Digital indicating controller (control means) 31 Control circuit 32 Piston 33 Grinding tool P Primary port A Secondary port P The primary side port Pb 1 primary port

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroyuki Yagi 3-6-6 Nishiki, Naka-ku, Nagoya City, Aichi Prefecture Inside Meitetsu Sumisho Kogyo Co., Ltd. (72) Hiroyuki Nagao 3-6-1 Nishiki, Naka-ku, Nagoya City, Aichi Prefecture No. Meitetsu Sumisho Kogyo Co., Ltd. (72) Inventor Ken Sawada 3-2-2, Marunouchi, Chiyoda-ku, Tokyo Inside Koganei Manufacturing Co., Ltd. (72) Toshiki Kawamura 3-2-2, Marunouchi, Chiyoda-ku, Tokyo Co., Ltd. Koganei Works (56) References JP-A-62-156404 (JP, A) JP-A-1-280102 (JP, A) JP-A-62-133701 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) E01B 31/17

Claims (2)

(57) [Claims] 1. A load current of a grinder motor is detected, an input signal of an electropneumatic converter is increased or decreased based on the detection signal, a secondary air pressure supplied to and discharged from a pneumatic cylinder is controlled, and the rail head is controlled. A rail grinding control method comprising: controlling the pressure of a grindstone to be constant. 2. A rail grinding control device comprising a plurality of grinding tools, each having a pneumatic cylinder, a grinder motor, and a grindstone sequentially connected to an apparatus main body, corresponding to rails, wherein a load current of the grinder motor is reduced. A rail grinding control device comprising: a detection unit for detecting; and a control unit for controlling the secondary air pressure supplied to and discharged from the pneumatic cylinder to keep the pressure of the grindstone on the rail head constant.