JP4554228B2 - Guide rail processing equipment - Google Patents

Description

  The present invention relates to a guide rail processing apparatus, and more particularly to a guide rail processing apparatus for finishing a traveling surface of an elevator guide rail.

  In general, a planar is used to process an elevator guide rail, and a tool block having a cutting tool is moved and processed by a predetermined amount each time the guide rail moves in the longitudinal direction. The amount of movement is small, and there is a problem that it takes a lot of time for processing.

As a proposal to solve this problem, recently, a rotating tool is arranged facing both side surfaces of the guide rail, and the both sides of the guide rail are machined by matching the center of the rotating tool and the guide rail (Patent Document). 1) has been proposed.
JP 2003-285216 A (paragraph number 0010, FIG. 1)

  In the above-mentioned proposal, an arc-shaped cutter mark, that is, an unevenness is formed. For this reason, when it used for the elevator with this processed surface, there existed a problem that the said unevenness | corrugation became a vibration source of a cage | basket | car.

  The objective of this invention is providing the processing apparatus of the guide rail which can remove the said unevenness | corrugation accurately.

In order to achieve the above object, the present invention provides a guide rail machining apparatus for finish grinding both side surfaces of a ground guide rail, a drive roll driven by a motor, a contact roll facing the drive roll, and the drive A processing head that is wound around a roll and the contact roll, rotates endlessly, and holds a grinding belt that grinds the guide rail that is moving by the conveying means, so as to be sandwiched between both side surfaces of the guide rail. And a control means for controlling the position of the machining head and detecting the load current value during grinding of the guide rail. The machining head is moved so that the load current value becomes a set value, and the grinding bell with respect to the guide rail is The conveying means is wound around a sprocket and is driven along the longitudinal direction of the guide rail, and is attached to the chain and is engaged with the end of the guide rail. Ri formed and a hook to be engaged, in front of the machining head, a detector for measuring the position of the unfinished work surface of the thrown-in the guide rails provided, said control means in response to the measurement of the detector Is used to position the machining head, determine the unfinished two-sided width dimension, and determine the grinding amount determined from the difference from the target two-sided width dimension and the number or grinding distance processed by the guide rail. Accordingly, the load current value is varied so as to have a constant two-plane width dimension .

  According to the present invention, the grinding amount of the grinding belt with respect to the guide rail is kept constant, the unevenness can be efficiently removed, and high-precision processing can be performed, thereby ensuring high efficiency, The machining accuracy required for the elevator guide rail can be realized.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective view showing an embodiment of a rail grinding apparatus of the present invention, FIG. 2 is an explanatory view showing the relationship between a load current value acting on a motor and a grinding amount, and FIG. 3 is a relationship between a grinding distance and a grinding amount. 4 is an explanatory diagram showing a control procedure of the rail grinding apparatus, FIG. 5 is an explanatory diagram showing another control procedure of the rail grinding apparatus, and FIG. 6 is another embodiment of the rail grinding apparatus of the present invention. FIG. 7 is a perspective view showing the configuration of the conveying means provided in the rail grinding apparatus.

  In FIG. 1, a guide rail 1 is guided by conveying rolls 2 and 3 and guided to a processing head 5 on which a grinding belt 4 is mounted. The grinding belt 4 is wound around a contact roll 6 and is driven by rotation of a spindle motor 8 via a drive roll 7. The contact roll 6, the spindle motor 8, and the drive roll 7 are attached on the processing head 5. The machining head 5 can slide on the base 9 in a direction perpendicular to the side surface of the guide rail 1 and is driven by a servo motor 11 via a feed screw 10. The same mechanism as that shown in the figure is installed on the opposite side, and the drive motor 8 and the servo motor 11 are connected to the same control means 12, respectively.

  Further, a detector 13 is installed in front of the machining head 5, that is, on the input side of the guide rail 1, and detects the position of the unfinished processed surface of the input guide rail 1. When the guide rail 1 is inserted, the detector 13 detects the position of the unfinished processed surface. In accordance with the position, the control means 12 moves the machining head 5 so as to obtain a predetermined cutting amount. When the contact roll 6 comes into contact with the guide rail 1 and machining is started, the load current value acting on the spindle motor 8 is read. The set value of the load current value of the spindle motor 8 is set in advance, and the control means 12 moves the machining head so that the load current value becomes the set value. By performing this operation continuously during processing, it is possible to perform processing with a constant contact pressure over the entire length of the guide rail 1.

  Since the end portion of the guide rail 1 can be detected by the detector 13, the end portion passes through the detector 13, and the above-described processing is terminated after a predetermined time, and the machining head 5 is retracted. As another method, since the end portion of the guide rail can be detected also by a change in the load current value, this method may be used instead.

  FIG. 2 shows the relationship between the load current value of the spindle motor 8 and the grinding amount (change in thickness before and after machining). As can be seen from FIG. 2, the load current value and the grinding amount are approximately proportional to each other. You can see that In this apparatus, in order to grind the surface of the guide rail by 20 μm, the load current value of the spindle motor 8 is controlled to be constant at 12A.

  On the other hand, the grinding ability of the grinding belt 4 deteriorates as the grinding distance increases, and the grinding amount decreases even under the same processing conditions. Fig. 3 shows the results of continuous machining with the spindle motor load kept constant, and the change in the grinding amount was examined. As can be seen from Fig. 3, the grinding amount is proportional as the grinding distance increases. Is decreasing. That is, in the control method in which the load current value of the spindle motor 8 is constant, the grinding amount can be made constant in processing of about one guide rail, but in mass production processing, the grinding amount is reduced depending on the wear state of the grinding belt 4. Therefore, a large number of guide rails having a constant two-surface width dimension cannot be manufactured.

  Therefore, as shown in FIG. 4, the spindle load is not set as the target value, and the grinding amount is controlled as the target value. The control means 12 counts the number of processed parts or the grinding distance, and determines the set value of the load current every time according to these. That is, the number of times of machining is fed forward with respect to this set value. The transfer function G3 is obtained in advance by experiments. Further, since the number of machining can be determined by the detector 13, the grinding distance is also obtained.

  The above method is intended to make the grinding amount constant on the basis of the unfinished surface of the guide rail 1. However, in mass production, the width of the sliding surface 2 of the guide rail in unfinished processing is as follows. fluctuate. In such a case, it is preferable to use the method of FIG. 5 in which the two-surface width dimension after grinding by the grinding belt 4 is constant. This is because the unfinished two-face width dimension is obtained by the detector 13 and the set value of the grinding amount is determined from the difference from the target two-face width dimension. That is, the set value of the load current is determined according to the unfinished two-surface width dimension and the belt wear state, and the processing head 5 is positioned.

  Although the sliding surface can be processed with high accuracy by the above method, another embodiment for further stabilizing the dimensional accuracy in belt grinding is shown in FIG. In mass production processing, the guide rail 1 is not necessarily in close contact with the conveying roll 3 depending on the bending state of the material in the vertical direction and the unevenness of the back surface. However, in order to make the amount of grinding constant, it is desirable that it is supported mechanically firmly. Therefore, the guide rail 1 is brought into close contact with the transport roll 43 by slightly inclining the contact roll 6 and generating a grinding force that presses the guide rail 1 downward. In the present apparatus, the inclination angle θ is set to about 10 °, but it may be further increased in consideration of the processing stripes on the processing surface.

  FIG. 7 is a diagram showing a configuration of a conveying unit that conveys the guide rail 1. A transport chain 14 is installed below the guide rail 1 along with the transport roll 3. The transport chain 14 is driven at a constant speed by the sprocket 15. A plurality of drive hooks 16 are attached to the transport chain 14, and the drive hooks 16 drive the guide rails 1 by engaging with the end portions of the guide rails 1. Normally, the workpiece is driven by a pinch roller or the like in the belt grinding of the plate material, but in the case of applying this method, a slip occurs between the pinch roller and the guide rail 1 due to the influence of the grinding force acting on the sliding surface. End up. When slipping occurs, the feed rate fluctuates, so that the grinding force is not constant and the sliding surface cannot be finished with high accuracy. However, in the present embodiment, since the thrust is mechanically applied to the guide rail 1 without using friction, the guide rail 1 can always be driven at a constant speed. That is, it is possible to finish the sliding surface with high accuracy while suppressing fluctuations in the feed rate.

  According to the present embodiment, it is possible to perform processing with a high accuracy within a width of 2 μm of the sliding surface of the guide rail 1 and at a high processing speed of one minute within one minute.

It is a perspective view showing one embodiment of a rail grinding device of the present invention. It is explanatory drawing which shows the relationship between the load electric current value which acts on a motor, and the grinding amount. It is explanatory drawing which shows the relationship between a grinding distance and grinding amount. It is explanatory drawing which shows the control procedure of a rail grinding apparatus. It is explanatory drawing which shows the other control procedure of a rail grinding apparatus. It is a perspective view which shows other embodiment of the rail grinding apparatus of this invention. It is a perspective view which shows the structure of the conveyance means with which a rail grinding apparatus is equipped.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Guide rail 2, 3 Roll for conveyance 4 Grinding belt 5 Processing head 6 Contact roll 7 Drive roll 8 Spindle motor 9 Base 10 Feed screw 11 Servo motor 12 Controller 13 Detector 14 Conveyor chain 15 Sprocket 16 Drive hook

Claims (2)

In a guide rail processing apparatus that finish-grinds both sides of a ground guide rail,
A driving roll driven by a motor, a contact roll opposed to the driving roll, wound around the driving roll and the contact roll, rotated endlessly, and grinds the guide rail being moved by the conveying means A processing head for holding a grinding belt is disposed so as to be sandwiched between both side surfaces of the guide rail, and a load current value acting on the motor is detected and the position of the processing head is controlled. The control means detects the load current value during grinding of the guide rail, moves the machining head so that the load current value becomes a set value, and grinds the grinding belt with respect to the guide rail. The conveying means is wound around a sprocket and is arranged along the longitudinal direction of the guide rail. A chain that is moving, attached to the chain, Ri formed by a hook which is engaged to an end portion of the guide rail, in front of the machining head, the unfinished processing surface of the entered the guide rail A detector for measuring the position is provided, and according to the measurement of the detector, the control means positions the machining head, obtains the unfinished two-side width dimension, and obtains the target two-side width dimension. An apparatus for processing a guide rail, wherein the load current value is varied to have a constant two-surface width dimension according to the grinding amount determined from the difference and the number or grinding distance of the guide rail processed. The rotation axis of the contact roll is inclined in a direction opposite to the feed direction of the guide rail, and a pressing force is applied to the guide rail in a downward direction according to the rotation of the grinding belt. The guide rail processing apparatus according to 1.

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