JPH07110379B2 - Shaft bending correction device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft bending correction device for correcting distortion, bending, etc. of a shaft such as an automobile crankshaft or a screw pump shaft.

(Prior Art) A conventional shaft bending correction device includes a pedestal having a supporting portion for supporting the shaft at a plurality of positions, and a correction for pressing the shaft supported by the supporting portion to correct the bending. It has a cylinder device that drives the head up and down, and a measuring device that is installed on a pedestal, such as a dial gauge, and the measuring head abuts the shaft. When bending measurement, the shaft is rotated and bent by the measuring device. It was configured to measure quantity (for example,
174639 gazette).

(Problems to be Solved by the Invention) In the above-described conventional configuration, since the measuring instrument is installed on the pedestal, the structure on the pedestal becomes complicated. Also, since the measuring instrument is exposed, the measuring instrument, especially the measuring head, is easily damaged when the shaft is set. Further, it is necessary to replace the measuring instrument or adjust the frequency frequently according to the bending amount of the shaft. Further, this makes it difficult to automatically supply the shaft body, and automation cannot be realized.
Further, when measuring the bending amount of the shaft body at a plurality of positions at appropriate intervals in the axial direction, many measuring instruments are required.

(Means for Solving the Problem) In order to solve the above problems, the shaft straightening apparatus of the present invention is supported by a pedestal having a support portion that supports the shaft body at a plurality of locations, and the support portion. A rotation driving device that rotates the shaft around an axis, a cylinder device that lifts and lowers a correction head that presses the shaft supported by the support to correct the bend, and the cylinder device. A transverse feed device for moving the axial body of the shaft supported by the support portion in the axial direction, and a control device for controlling the rotary drive device, the cylinder device and the transverse feed device are provided, and the cylinder device is provided with the straightening device. A position detector for detecting the position of the head is built in, and at the time of bending measurement, the rotation drive device and the cylinder device are controlled by the control device to rotate the shaft supported by the support part around the axis. The shaft is rotated continuously or intermittently, the correction head is lightly abutted on the shaft, and the position of the correction head is detected by the position detector to measure the bending of the shaft. It is a thing.

(Operation) The control device rotates the shaft supported by the support portion continuously or intermittently around the shaft center, slightly abuts the correction head on the shaft, and detects the position of the correction head by the position detector. To measure the bend.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a front view of a shaft straightening apparatus according to an embodiment of the present invention, and FIG. 2 is a side view of the same, in which both ends of a shaft 2 such as a screw pump shaft are supported on a pedestal 1. A support part 3 and a servomotor 4 as a rotation drive device for rotating the shaft body 2 supported by the support part 3 around an axis are installed, and a column is erected at four corners on the pedestal 1. A frame 6 is supported by 5. A cylinder device 7 as a lateral feed device and a slide base 8 that can be moved in the left-right direction in FIG. 1 by the cylinder device 7 are installed on the frame 6, and the shaft body 2 is pressed against the slide base 8. A cylinder device 10 for raising and lowering a correction head 9 for correcting the bending is installed. A hydraulic unit 11 for supplying hydraulic oil to the cylinder devices 7 and 10 is arranged near the lower part of the gantry 1, and a control device 12 for controlling the servo motor 4 and the cylinder devices 7 and 10 is provided on the side of the gantry 1. Are placed close together.

FIG. 3 is a configuration diagram of a main part of the shaft bending correction device, and the control device 12 includes a personal computer 14 and a programmable controller 15. Servo motor 4 and cylinder devices 7, 10 are programmable controllers
The programmable controller 15 is electrically connected to the personal computer 14. The cylinder devices 7 and 10 are connected to the hydraulic unit 11 via hydraulic pipes.

As shown in FIG. 4, the cylinder device 10 includes a cylinder 16, a piston rod 17 slidably fitted in the cylinder 16, a servo valve 18 having a control circuit described later and controlling hydraulic oil, and a piston. The rod 17 includes a position detector 19 for detecting the position of the correction head 9 formed integrally with the tip of the rod 17. The cylinder 16 is provided with oil chambers 20 and 21, and an oil passage 23 that connects the oil chamber 20 and the servo valve 18 via a filter module 22, and an oil chamber 21 and a servo via the filter module 22. An oil passage 24 that communicates with the valve 18 is formed. Position detector 19 is a detection rod
25, the detection rod 25 penetrates into a hole 17a formed in the piston rod 17 along the axial direction over substantially the entire length. The control circuit of the servo valve 18 is a cable
It is connected to the position detector 19 via 26 and to the programmable controller 15 via a cable 27. The position detector 19 is composed of, for example, a magnetostrictive displacement sensor that utilizes the Fedemann effect, and detects the extension amount of the piston rod 17, that is, the position of the correction head 9. A linear encoder, potentiometer, or the like may be used as the position detector 19. The cylinder device 7 has the same structure as the cylinder device 10.

As shown in FIG. 5, the control circuit built in the servo valve 18 includes an interface circuit 29 for exchanging signals with the programmable controller 15, and a feedback signal processing circuit 30 for processing signals from the position detector 19. , A PID calculation circuit for performing PID calculation based on signals from the interface circuit 29 and the feedback signal processing circuit 30
31 and a PWM control circuit 32 that outputs a pulse-width-modulated control signal to the solenoid of the servo valve 18 based on a signal from the PID calculation circuit 31.

Next, a sixth flowchart showing the operation of the control device 12.
The operation will be described with reference to the drawings. The shaft 2 and the supporting portion 3
Set to the start button (not shown) of the controller 12
When is pressed, the bending of the shaft body 2 is first measured in step a. That is, the cylinder device 7 operates to move the slide base 8 to a predetermined position, and the cylinder device 10 operates to bring the correction head 9 into contact with the shaft body 2 with a small force. The straightening head 9 may be brought into contact with the shaft body 2 by the weight of the piston rod 17 including the straightening head 9. Then, the servo motor 4 operates to rotate the shaft body 2 around the axis, for example, once, and at this time, the position detector 19 causes the straightening head 9 to rotate.
Is detected and the data is supplied to the control device 12 via the control circuit of the servo valve 18. Then, the maximum measurement value indicating the amount of deformation due to bending is digitally displayed on the display unit (not shown) of the control device 12. Servo motor 4
The shaft body 2 may be rotated by a predetermined angle around the axis to measure. If there are a plurality of measurement points in the axial direction of the shaft body 2, the cylinder device 7 sequentially sends the cylinder device 10 to the next measurement point, and the above measurement operation is performed for each measurement point.

Next, the process proceeds to step b, and it is determined whether or not the bending measurement value S1 measured in step a is less than or equal to a set value S2 preset in the control device 12.

If it is determined that the measured value S1 is not less than or equal to the set value S2, the process proceeds to step c to index the correction point. That is, the cylinder device 7 operates to move the slide base 8 and position the cylinder device 10 at the position to be corrected.

Next, in step d, the shaft 2 is positioned. That is, the servomotor 4 operates to rotate the shaft body 2 so that the apex of the bend is directed upward.

Next, in step e, the bending of the shaft body 2 is automatically corrected.
That is, the cylinder device 10 is actuated, and the shaft 2 is firmly pressed by the correction head 9 with the optimum stroke amount according to the difference between the measured value S1 of the bend and the set value S2 to correct the bend.

Next, in step f, learning is performed. That is, the control device 12 has a learning function of understanding and memorizing work contents and given conditions based on work experience, determining what should be done, and selecting / implementing optimum control. Therefore, accurate and delicate control can be performed.

Next, returning to step a, the same operation is performed again. That is, the correction work is repeated while finely adjusting the stroke amount of the correction head 9 until the bending measurement value S1 becomes equal to or less than the set value S2.

If it is determined in step b that the measured value S1 of the bend is less than or equal to the set value S2, the process proceeds to step g, in which the completion of the correction work is notified by an indicator lamp (not shown) of the control device 12, To stop. When there are a plurality of correction points in the axial direction of the shaft body 2, the cylinder device 7 sequentially sends the cylinder device 10 to the next correction point, and the above correction operation is performed for each correction point. After the correction of the correction point is completed, the process proceeds to step g.

As described above, since the position detector 19 is built in the cylinder device 10 and the straightening head 9 is slightly contacted with the shaft body 2 to measure the bending of the shaft body 2, the measurement is performed as in the conventional device. Since it is not necessary to install the device on the gantry 1, the structure on the gantry 1 is simple and the degree of freedom in arranging the support portion 3, the servo motor 4, etc. is large. Also position detector
Since 19 is built in the cylinder device 10, it is possible to improve durability and reliability without damaging the measuring instrument when setting the shaft body 2 unlike the conventional device.
Further, since the position detector 19 is built in the cylinder device 10 and the straightening head 9 is slightly brought into contact with the shaft body 2 to measure the bending of the shaft body 2, the shaft body 2 can be measured like the conventional device. It is not necessary to replace the measuring instrument or frequently adjust according to the bending amount.
It is easy to automatically supply and can be fully automated. Further, since the cylinder device 7 for moving the cylinder device 10 in the axial direction of the shaft body 2 is provided, the bending of the shaft body 2 can be measured at any position in the axial center direction, and the number of measurement points is the same as in the conventional device. Since it is not necessary to install a large number of measuring instruments according to the above, the cost can be reduced. If the control device 12 is provided with a learning function as in this embodiment, accurate and delicate control can be easily performed.
The correction accuracy can be improved.

(Other Embodiments) In the above embodiments, the servo motor 4 is used as the rotation drive device, but the present invention is not limited to such a configuration, and instead of the servo motor 4, for example, a stepping motor or the like may be used. You may use.

Further, in the above embodiment, the cylinder device 7 having the same structure as the cylinder device 10 is used as the lateral feeding device, but the present invention is not limited to such a structure, and instead of the cylinder device 7, for example, a rack device is used. -A pinion mechanism or the like may be used.

(Effects of the Invention) As described above, according to the bending correction device for a shaft body of the present invention, the position detector is incorporated in the cylinder device, and the correction head is lightly contacted with the shaft body to bend the shaft body. Since the measurement is performed, there is no need to install the measuring instrument on the pedestal as in the conventional device, so the structure on the pedestal is simplified and the degree of freedom of arrangement of the support part, the rotation drive device, etc. is increased. large.

Further, since the position detector is built in the cylinder device, it is possible to improve durability and reliability without damaging the measuring device when setting the shaft body unlike the conventional device.

In addition, the position detector was built into the cylinder device, and the bending of the shaft was measured by lightly contacting the straightening head with the shaft, so that it can be measured according to the amount of bending of the shaft as in conventional devices. It is not necessary to change the vessel or perform frequent adjustments, and because of this, automatic supply of the shaft body is easy and full automation can be realized.

In addition, since a transverse feed device that moves the cylinder device in the axial direction of the shaft is provided, it is possible to measure the bending of the shaft at any position in the axial direction, and according to the number of measurement points as in conventional devices. Since there is no need to install many measuring instruments,
The cost can be reduced.

[Brief description of drawings]

FIG. 1 is a front view of a shaft bending correction apparatus according to an embodiment of the present invention, FIG. 2 is a side view of the same, and FIG.
FIG. 4 is a schematic configuration diagram of the cylinder device, FIG. 5 is a circuit block diagram of a control circuit incorporated in the cylinder device, and FIG. 6 is a flowchart for explaining the operation of the control device. 1 ... Stand, 2 ... Shaft, 3 ... Support part, 4 ... Servo motor (rotary drive device), 7 ... Cylinder device (transverse feed device), 9 ... Straightening head, 10 ... Cylinder device , 12 ...
… Control device, 19… Position detector

Claims (1)

[Claims] 1. A gantry having a support portion for supporting the shaft body at a plurality of locations, a rotation drive device for rotating the shaft body supported by the support body around an axis, and a support supported by the support portion. A cylinder device for vertically moving a straightening head for pressing the shaft body to correct the bending, and a transverse feed device for moving the cylinder device in the axial direction of the shaft body supported by the support portion, A control device for controlling the rotary drive device, the cylinder device, and the lateral feed device is provided, and the cylinder device includes a position detector that detects the position of the straightening head. By controlling the rotary drive device and the cylinder device, the shaft supported by the supporting portion is continuously or intermittently rotated around the axis, and the correction head is lightly abutted on the shaft. Te, straightening device of the shaft, characterized in that the arrangement for measuring the bending of the shaft body by detecting the position of the straightening head by the position detector.