JPH02190732A - Automatic correcting device for unbalance of rotary body - Google Patents

Abstract

PURPOSE:To automatically correct the dynamic balance of a rotary body during the operation by mounting a correction operating part automatically correcting the unbalance of the rotary body itself and transmitting a command signal for the unbalance correction to this correction operating part. CONSTITUTION:First, the correction command for the unbalance of rotary body is transmitted from a control unit to the correction operating part 9 through a mercury slip ring. Next, pinion gears 20, 20a are rotated by stepping motors 19, 19a to make two internal gears 12, 12a to rotationally move respectively. Then, the positions where original point plates 17, 17a are detected by photosensors 21, 21a are made as original points, and when two internal gears 12, 12a are rotationally moved by the angles commanded respectively, relative positions for two balancing weights 16, 16a are shifted to the positions compensating the unbalance. Consequently, the unbalance is automatically corrected.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides an automatic unbalance correction device for a rotating body, such as a grinding wheel in a grinding machine, for balancing the unbalance of the dynamic balance of a rotating body during operation. It is related to.

(Prior art) If there is an imbalance in a rotating body, it will appear as vibration, and for example, in the case of a grinding wheel in a grinding machine, it will have a negative effect on the grinding accuracy and surface roughness, so it is necessary to maintain a precise dynamic balance. It is often necessary to correct imbalances in actual operating conditions.

For this reason, conventionally, as shown in Fig. 11, the position of the balance weight (Ka) for unbalance correction attached to the circumferential groove (Fa) provided in the flange (F) that holds the grinding wheel (G) has been changed. The method used was to move the object while it was stationary, relying on the senses of an experienced technician, and then rotate it to view it.The adjustment was repeated several to thousands of times until the imbalance was corrected.

(Problem to be solved by the invention) In the conventional unbalance correction method described above, three
It takes a long time of 0 to 120 minutes, which causes a major hindrance to the work, and requires skilled technicians, but there has been a shortage of people with these skills in recent years. There was such a problem.

In order to solve the above-mentioned conventional problems, this invention
It is an object of the present invention to provide an automatic unbalance correction device for a rotating body that is integrally attached to the rotating body and automatically corrects the dynamic balance of the rotating body during operation.

(Means for Solving the Problems) The present invention for achieving the above object has the structure described in the claims, and the desired object can be achieved by this structure.

(Function) When the control unit sends an unbalance correction command for the rotating body to the correction actuator via the mercury slip ring, the stepping motor rotates the pinion gear and rotates the two internal gears, causing the photo sensor to rotate. With the position where the origin mark plate is detected as the origin, when the two internal gears rotate from this origin position by the angle received by each command, the relative positions of the two balance weights move to a position that cancels out the unbalance. The imbalance is automatically corrected.

(Example) Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

Fig. 1 is a schematic diagram showing an example in which the present invention is applied to a grinding wheel of a grinding machine, Fig. 2 is a cross-sectional view in the axial direction of a corrective action section attached to the grinding wheel, and Fig. 3 is a cross-sectional view of the corrective action section attached to the grinding wheel. 1 is a front view showing the internal structure of the machine, in which (1) is a grinding wheel that is a rotating body, and is attached to a rotating shaft (2), and this rotating shaft (2) is supported by a bearing (3) to drive an electric motor. (not shown) is transmitted to the pulley (4) and driven.

(5) is a vibration sensor that detects vibration appearing in the bearing (3) and generates a vibration signal when the grinding wheel (1) is unbalanced.

(6) is a rotation synchronization sensor, which is installed corresponding to the origin mark (7) attached to one location on the outer circumference of the rotating shaft (2), and detects this origin mark (7) and issues a rotation synchronization signal. It is.

(8) is a control unit with a built-in microcomputer, which inputs the vibration signal from the vibration sensor (5) and the rotation synchronization signal from the rotation synchronization sensor (6), calculates this, and generates an unbalance correction signal. This outputs the following.

(9) is a correction operation unit, which is attached to the grinding wheel flange 00) on the side of the grinding wheel (1), receives an unbalance correction signal from the control unit (8), and operates based on this unbalance correction signal. The imbalance of the grinding wheel (1) is corrected by moving the balance weight.

The details of the correction operation section (9) will be explained with reference to FIGS. 2 and 3.

A main body housing (11) formed in a hollow ring shape is attached to the grindstone flange 0 that holds the grindstone (1) with its center aligned with the axis of the grindstone (1).

Two identical ring-shaped internal gears 02 (12a) are mounted on the inner periphery of this main body housing (10) in parallel via an oil-less bushing surface. A sliding ring 04) made of Teflon resin is interposed between the internal gears 02) and (12a), and the outer side is a ring-shaped stop plate 05 attached to the main body housing 01).
) (15a) and its position in the axial direction is regulated.

This internal gear 02) (12a) has a nearly sector-shaped balance weight 0ω (16a) projecting toward the outer circumference on its outer side, and an elongated plate-shaped origin plate 07) (17a) projecting toward the inner circumference. and are attached at positions 90° apart in the center angle, and when there is no imbalance in the rotating body (1), the balance weights 0ω and (16a) and the origin plates 0 and (17a) are as shown in Figure 3. As shown in the figure, the gears are set so as to be located opposite each other on the diametrical center line of the internal gear 021 (12a).

0 [D (18a) is a support member, which is a disc that closes both sides of the main body housing 00, and is located on the diametrical center line of the outer surface of the support member OF on the side opposite to the grinding wheel of the main body housing (II). Two stepping motors 09) (19a) are installed at opposite positions with respect to the center, and an internal gear (12) (12a) is connected to the output shaft of the stepping motors 09) (19a). Pinion gear G that meshes with each other! In (20a) is attached, and as the internal gear Q21 (12a) rotates, the origin play (07) on the inner surface of (18a) of support member 0 is located at the position on the circumference corresponding to (17a). Photosensors (21) (21a) for detecting the origin plate 07) (17a) which moves due to the movement of the base plate 07) are respectively attached.

(22) is a control board, which is attached to the outer surface of the support member OI, controls the operation of the stepping motor 09) (19a), and is equipped with an arithmetic circuit.

(23) is a mercury slip ring, and the main body housing (1
1) The support member 00 is attached to the outer surface of the case 1).

It is attached to the center of rotation of the cover member (24), and is connected to the stepping motor Q9) (19a) and the photo sensor (2).
1) From the stationary body to the rotating body for receiving power and control signals for driving (21a) from the control unit (8) via the cable (25) and supplying it via the control board (22). It serves as a relay.

In the above configuration, the photosensor (21) (21a
), the origin plate Q7) (17a) is in the same position as shown in Figure 3, and the origin plate (17) (
The microcomputer of the control unit (8) recognizes the state in which the photo sensor (21) (21a) is blocked by the photo sensor (21) (21a). At this time, the two balance weights 0ω (16a) are on the diametrical center line (X4'),
They are located opposite each other and are balanced.

In this state, when the grinding wheel (1) starts and reaches a steady rotation speed, the vibration sensor (5) and the synchronous rotation sensor (
6) The unbalance information signal from the control unit)
(8), the control unit (8)
The microcomputer arithmetic circuit built into the
30) calculates how many times the balance weights (16) and (16a) need to be moved clockwise or counterclockwise from the 0 degree origin position to correct the imbalance, and ), mercury slip ring (23)
, via the control board (22), the stepping motor Q9)
(19a) by supplying driving power and a correction command signal,
Drive this and pinion gear C! The control unit (8) rotates the internal gear 02) (12a) via In (20a), and rotates the balance weight Q6) (16a) attached to this internal gear clockwise or counterclockwise. This is to correct the imbalance by moving it to the commanded position.

Next, the control for correcting the imbalance is shown in Figures 5 to 10.
This will be explained based on the diagram.

Figure 5 is a control circuit configuration diagram for unbalance correction, and Figure 6 shows its details, including the power supply (DC) and stepping motor Q9.
) (19a), the first coil (
Ll) is provided on the power receiving side (31b) with a second coil L) interposed, and the first coil (L,) is located in the front position and the second coil (L2) is located in the rear position with respect to the current direction. A signal supply circuit (32) (32a) connected to the arithmetic circuit (3o) in the control unit (8) and a signal regeneration circuit (33)
(33a) are connected to each other, and the signal reproducing circuit (33a) on the power receiving side (31b) receives and reproduces the correction command signal issued by the signal supply circuit (32) on the power feeding side (31a). , the arithmetic circuit (30a) operates the stepping motor (19) (19a) for correcting the imbalance;
When the operation is stopped, the arithmetic circuit (30a) transmits an operation completion signal from the signal supply circuit (32a) on the power receiving side (31b), and the signal regeneration circuit (33) on the power supply side (31a) receives and reproduces the signal. , the control unit (8) confirms that the unbalance correction has been completed.

Then, as shown in FIG. 6, the signal supply circuit (32) (3
2a) are resistors (Rs, ) (Rsz) and switches (sw+) (shz) connected in series, and the signal regeneration circuits (33) (33a) are each connected to a high voltage side comparator (34H1) ( 3482) and low voltage side comparators (34Ll) (34L2) are connected to R-S flip-flops (35) (35a).

Next, the signal supply circuit (
32) and the operation of the signal reproducing circuit (33a) will be explained.

Switch (of the signal supply circuit (32) on the power supply side (31a)
The power supply path voltage when SWI) is OFF is expressed by the following formula [1].

Vs = It ・(Rt +RLz) ・−H) Here, (IL) is the load current (RL), and (
RL2) is the resistance component of the second coil (L2).

When the switch (SW l ) is turned on, a switch current (I, ) flows through the signal supply circuit (32).
Current is supplied from the coil (Ll) side to the first coil (1, 1
), the load current (It) decreases, and the power supply line voltage (VS) becomes the following (II)2, which is lower than the above [Equation 13].

Vs −(It Is) ・(Rt +RL
Z)... (IT) When enough time passes in this state, the first coil current (
rLI) increases by the switch current (r,), and the power supply line voltage (V,) returns to (1)2.

Next, when the switch (SW l) is turned off, the switch current (I, ) stops flowing, but the decrease in the switch current (■, ) component of the first coil (Ll) is delayed, so the power supply line voltage (V,) is the following formula (III), which increases from the above [13 formula].

Vs = (It + Is) ・(Rt +RLZ
)... (1) As time passes further, the switch current (■, ) component in the first coil current (ILl) decreases, and the power supply path voltage (ν,) returns to equation (1).

The above operation is shown in the time chart of FIG. 7, where the power supply path voltage (Vs) produces a negative pulse when the switch (SWI) is turned on, and a positive pulse when it is turned off.

The signal regeneration circuit (33a) on the power receiving side (31b) receives these negative side and positive side pulses, and the high voltage side comparator (3
Figure 7 shows the high voltage side comparator output voltage (V
c+) and the low-voltage side comparator output voltage (Vcz) are obtained and supplied to the R-S flip-flop (35a), and the output voltage (VO) of the signal regeneration circuit (33a) on the power receiving side (31b) is obtained. , the signal supply circuit (3) on the power supply side (31a)
It is played back in the same manner as when the switch (SWI) is turned on and off in 2).

In this way, the signal supply circuit (32) on the power supply side (31a)
At this time, the correction command signal supplied by turning the switch (sWI) ON/OFF is regenerated in the signal regeneration circuit (33a) on the power receiving side (31b), and based on this regenerated correction command signal, the stepping motor θ9) (19a
) to correct the unbalance. When the unbalance correction is completed in this way, the correction completion signal is sent to the switch (SW) of the signal supply circuit (32a) on the power receiving side (31b).
Z) is opened and closed to send a signal to the power supply side (33), and the signal regeneration circuit (33) receives and reproduces it to confirm that the unbalance correction has been completed. This is the same as when transmitting from the power supply side (31a) to the power reception side (31b), and the explanation will be omitted.

Next, an abnormality detection means for checking whether unbalance correction has been completed within a predetermined time will be explained based on FIGS. 8 to 10.

Balance way attached to rotating body (1)) 0
6) If the position of (16a) is moved to an inappropriate position, the unbalance becomes large and vibration increases, leading to damage to the rotating body (1), which may lead to an accident involving human life.

Therefore, check whether the above-mentioned unbalance correction operation (operation of stepping motor Q9 (19a)) is completed within a predetermined time, and if it is not completed within a predetermined time, it is assumed that there is an abnormality and the power is turned off to correct the unbalance. It is equipped with an abnormality detection means for stopping the operation, and this abnormality detection means is shown in FIGS. 8 to 10.
In the circuit configuration diagram of FIG. 8, which will be explained based on the diagram,
A stepping motor 09 is provided in the correction operation section 09) in the arithmetic circuit (30) in the control unit (8).
) (19a) is programmed in the program memory (30a), and a subtraction counter circuit (36) is connected to generate a pulse that supplies a counter clock pulse to the subtraction counter circuit (36). The stepping motor 0! is connected to the control board (22) in one of the correction actuation parts (9). The program memory (22a) is programmed to send an operation stop signal when the D (19a) stops.

In this way, the subtraction counter circuit (36) manually inputs the counter constant set by the arithmetic circuit (30), and inputs this counter constant to the subtraction counter circuit (36) using the counter clock pulse generated by the pulse generator (37). Then, the counter constant is decreased at a rate of 1 for each counter clock pulse, and when the counter constant reaches O, the counter O signal is sent from the subtraction counter circuit (36) to the arithmetic circuit (30).
), and this arithmetic circuit (30) connects the power supply path (
31) Stop power supply to stepping motor Q9.
H19a) is stopped.

The time from setting this counter constant to generating the counter O signal is (time interval of counter clock pulse) x (
counter constant). Therefore, the configuration in the control unit (8) shown in FIG. 8 constitutes a timer that can arbitrarily set the operating time of the stepping motor Q9H19a) by changing the counter constant.

A time chart of the counter constant subtraction described above is shown in FIG.

With the above configuration, the arithmetic circuit (30) starts the timer according to the program and then sends a correction command signal to the control board (22) in the correction operation section (9) through the communication circuit (31'). The arithmetic circuit (CPU) included in this control board (22) drives the stepping motor 09) (19a) according to the correction command signal, and after the operation is completed, sends a correction completion signal through the communication circuit (31'). It is transmitted to the arithmetic circuit (30) in the control unit (8). At this time, if the arithmetic circuit (30) cannot receive the correction completion signal by the time amplifier, the correction operation section (30)
It is assumed that some abnormality has occurred in 9), and the operation of the correction operation section (9) is stopped.

The action explained above is shown in the time chart of Fig. 10,
Let's explain by following the symbols.

(a) From the control unit (8) to the correction actuator (9)
) and simultaneously starts a timer (Ll).

(II) The correction operating section (9) starts operating.

(c) The correction operating section (9) stops operating.

(=) An operation completion signal is sent to the control unit (8) at the same time as the correction operation section (9) stops operating.

(ne) Control unit (8) is a timer (1+)
Since the operation completion signal is confirmed within the set time, the abnormality detection means is interrupted.

(to) When the control unit (8) issues the next correction command signal to the correction actuation section (9), the timer (t2) is activated.
Start.

(g) The correction operating section (9) starts operating.

(H) Although the timer (t2) elapsed, the operation completion signal from the correction operation section (9) could not be confirmed.
It is assumed that an abnormality has occurred in the corrective action section (9) and the power is turned off.

(a) The correction operation section (9) stops operating when the power is turned off.

By the above procedure, it is possible to prevent the correction operation section (9) from operating abnormally, and to prevent the danger caused by erroneous correction of the imbalance.

In addition, in the present example, the correction actuator (9) is shown as being attached directly to the grinding wheel (1), but the grinding wheel (]
) Rotating shaft (2) or pulley (4) that rotates together with
It is also possible to correct unbalance by attaching it to

(Effects of the Invention) According to the automatic unbalance correction device for a rotating body of the present invention as described above, a correction operation unit for automatically correcting unbalance is attached to the rotating body itself, so that unbalance can be corrected while the rotating body is rotating. At this time, a control unit incorporating a microcomputer processes the unbalance information signals from the vibration sensor and the rotation synchronization sensor, and sends an unbalance correction command signal to the correcting actuating section. By moving two balance weights, it is possible to automatically correct the unbalance of a rotating body during rotation, eliminating the need for manual corrections that rely on conventional experts, and reducing wasted time for corrections. Since it is equipped with an abnormality detection means that prevents erroneous corrections, it eliminates erroneous corrections and prevents the occurrence of dangerous factors such as increased vibration due to erroneous corrections, resulting in safe unbalance of the rotating body. An automatic correction device is obtained.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a device showing an example of applying the present invention to a grinding wheel, Fig. 2 is a diametrical cross-sectional view of a correction actuator attached to an unbalanced grinding wheel, and Fig. 3 is a cross-sectional view taken from Fig. 2 n-n. Figure 4 is an enlarged cross-sectional view of the main part taken along the line ■-■ in Figure 3. Figure 5 is a control circuit configuration diagram for correcting unbalance. , Fig. 6 is a detailed diagram of the control circuit shown in Fig. 5, Fig. 7 is a time chart of control of the control circuit shown in Fig. 6, Fig. 8 is a circuit configuration diagram of the abnormality detection means, and Fig. 9 is an abnormality detection FIG. 10 is a time chart of count constant subtraction in the detection means, FIG. 10 is a time chart of abnormality detection, and FIG. 11 is a front view showing a conventional device for correcting imbalance of a grinding wheel. l... Rotating body (grinding wheel) 2... 3... Bearing 5... 6... Rotation synchronization sensor 8... Control unit 9... Correction actuation part 11... Main body housing 12, 12a... Internal gear 16.16a・・Balance weight 17, 17a・・Origin plate 18.18a・・Support member 19.19a・・Stepping motor 20.20a・・Pinion gear 21.21a・・Photo sensor 22・23・・Mercury slip ring 24・ 25・・Cable 30.30a31...Power supply path 31' 31a...Power supply side 31b 32.32a...Signal supply circuit 33, 33a...Signal regeneration circuit・Rotation shaft・Vibration sensor・Control board・Cover member・Arithmetic circuit・・Communication circuit・・Power receiving side Figure 1 Figure 1 Timer operation stop procedure NE city official document (self-proposal) March 3, 1999 2゜4゜Heisei 1 Patent Application No. 11495 Name of the invention Relationship to the case of a person who corrects an automatic unbalance correction device for a rotating body Patent applicant Address 5-60 Daimon-cho, Fukuyama-shi, Hiroshima Name Dai
Miya Kogyo Co., Ltd. Agent (?730 fi(082)221-38
095, Date of notification of reasons for refusal (voluntary) 6, Number of inventions increased by amendment 07, Column for detailed explanation of the invention in the specification to which the amendment is based and drawings, Figure 6, Figure 10 Figure 11

Claims (3)

[Claims] (1) A correction actuator attached to the rotating body that receives an unbalance correction command signal obtained by calculating the unbalance information signal of the rotating body detected by the vibration sensor and the rotation synchronization sensor by a control unit incorporating a microcomputer. A device for automatically correcting the unbalance of the rotating body during rotation, the correction actuating unit being attached to a substantially annular main body housing with the center of rotation coincident with the rotating body, the main body housing Two identical internal gears are rotatably mounted on the inner periphery of the main body housing, and one balance weight and one origin mark plate are attached to each of the two internal gears. Two stepping motors that drive pinion gears meshing with the two internal gears are placed on the attached support member at a position where the origin mark plate approaches during rotation, and the origin mark plate is detected. 1. An automatic unbalance correction device for a rotating body, characterized in that it has a configuration in which two photosensors are attached for the purpose. (2) A structure is adopted in which power for driving the stepping motor and photo sensor is supplied via a mercury slip ring provided at the rotation center of the cover member attached to the main body housing and a control board, and the power Coils are arranged respectively on the power feeding side and the substation side of the power supply path that supplies the power, and at the front position of the coil on the power feeding side and the rear position of the coil on the power receiving side in the current direction of the power supply path, The automatic unbalance correction device for a rotating body according to claim 1, wherein a signal supply circuit connected to the control unit and a signal regeneration circuit are connected, and the power supply path also serves as a communication circuit. (3) A timer for setting the operating time of the stepping motor is programmed in the control unit, and a timer is programmed in the control board to send an operation stop signal when the stepping motor stops; 2. The automatic unbalance correction device for a rotating body according to claim 1, further comprising abnormality detection means for stopping the stepping motor if the operation stop signal is not transmitted within a set time of the timer.