JPS5844307A - Detector for wear of gear device - Google Patents

Abstract

PURPOSE:To facilitate the checking of a reduction gear for wear, by a method wherein the wear of gear is detected by means of a rotary angle, and it is converted into the number of pulses by an encoder. CONSTITUTION:If a power source is applied to a winding motor 5, a brake 6 is released and simultaneously a reduction gear 4 is driven to wind a rope 2. A small-sized motor 7 and an encoder 8 are connected to a main system. The encoder 8 converts the rotary angle of the gear 4 into the number of pulses, and it is connected to a counter 9 in a controller 29. The output is compared with a set value 12 by a subtraction circuit 10, a display unit 13 displays whether the result is normal or abnormal. The set value 12 is set to a value which is obtained by adding the number of pulses, found by an initial state measurement, to a wear limit pulse. This enables to perform a check of the gear for wear at a remote spot from the winding device body. Additionally, a detection error due to unevenness of a device can be minimized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device having a reduction gear such as a hoist, and particularly to a reduction gear wear detection device suitable for checking wear of the reduction gear.

The principle of a conventional hoisting device is shown in FIG. When power is applied to the hoisting mode 5, the brake 6 is simultaneously released to drive the deceleration gear 4, rotate the drum 1, wind the wire rope 2, hoist or unwind the load block 3, Load up.

down. Although maintenance and inspection are important and indispensable for such hoisting devices, there is a drawback in that they are rarely performed, partly because the hoisting device is located at a high place.

The purpose of the present invention is to make it easier to check the wear of the reduction gear in a hoist or other hoist, and to indicate when the gear has reached its wear limit by displaying an abnormality on the gear or stopping the hoisting body. This is what I am trying to do.

In the case of conventional hoists, etc., the gear case must be removed to inspect for wear. The present invention eliminates this trouble and detects gear wear by the rotation angle of the first-stage pinion shaft system, converts it into a pulse number using an encoder, compares it with a predetermined number of pulses, and detects an abnormality when the wear is large. The display or the main body of the hoisting machine is stopped.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 6. As shown in Figure 2, a new small model 7 is added to the spindle system.
Connect encoder 8. In this embodiment, the encoder 8 uses a highly accurate optical type. The output of this encoder 8 is connected to a counter circuit 9 in the internal total control device 29, and compared with a set value 12 in a subtraction circuit 10, and the abnormal force/total display 13 indicates whether n is normal or not.

According to the flowcharts in Figures 4 and 5, Figures 3 and 6
Explain the operation of the diagram.

First, the initial value setting operation will be explained. Switch 3 (I
Enters the L state side. Backlash measurement 5TAII, T
Therefore, D2 has 1. (The state is input, the memory and count of the control device 29 are reset, and the drum lock instruction is output from D4.) The relay 23 is driven, the solenoid 15 is attracted, the brake lining 14 is brought into close contact with the drum 1, and the drum lock instruction is output from D4. At the same time, the brake 6 is released by the relay 23.The forward rotation instruction for the small mode model 7 is output from D5, which drives the relay 24 and causes the small mode mode 7 to rotate in the normal direction. In order to make the determination, the ① state is stored in the memory 1.Here, the ① state C represents a high level with H, and the L state represents a low level with L as shown below.The output from the encoder 8 is Read, H
It is determined whether the change is from L to H or not. (2) If L changes from (, determine whether memory 1 is H or not. If memory 1 is IT, return to reading the output from encoder 8. If memory 1 is L'Z, count and return to reading encoder output. When the small moder 7 rotates a certain amount and the rotor locks and stops, it stops changing from H to L or from L to H, and the encoder 8 changes the state to ■ (or L) depending on the stop position of the slit disc. and determines whether memory 2 is I (or not. If not, it is determined that small mode model 7 is locked, forward rotation instruction yOFF"L, lJ from D5 is turned off, and L is stored in memory 1. do.

Memory 2 is used to determine whether a reverse operation has been performed.
Store 11 on. Now preparations for backlash measurement are completed and backlash will be measured during the next reverse rotation. Reverse direction instruction is output from iD6, drives the relay 25, causes the small model 7 to operate in reverse, and returns to reading the output from the encoder 8. Since memory 1 is at L, counting is performed when a change from H to L is detected. In the case of a change from L to H, the process returns to reading the output from the encoder 8. When there is no change from L to -1 or from H to ■, the small model (
It is determined that the memo is locked, and the memo January 2 is determined to be H. If it is II, the reverse rotation stop instruction is output from kD6 and the relay is activated.
25! rOFFL Stops the reverse operation. Next, D.I.
Determine whether =L. Here, since Dl is L due to measurement in the initial state, the control device 29 displays the count display 18.
A count number is output to D4, a drum lock release instruction is output from D4, the relay 23 is turned off, the drum lock is released, the brake 6 is activated, and the initial value backlash measurement is completed.

Next, the gear wear check operation will be explained with reference to the flowcharts of FIGS. 4 and 5, and with reference to FIGS. 3 and 6.

A set pulse value obtained by adding the wear limit pulse to the number of pulses determined by the initial state measurement is inputted to the control device 29 from the dip switch 22 as the set value 12. To check gear wear, turn on switch 30k l-T and Dl. The backlash measurement operation is the same as the initial state measurement, but the difference is that H is input to Dl, so the count number and the set value are compared by judgment. If this happens, an abnormality display instruction will be output from Dl and the abnormality will be displayed by the light emitting diode 31. If the count is smaller than the set value 12, a normal display instruction is output from D8 and the light emitting diode 19 displays normally. Next, a drum lock release instruction is output from D4, the relay 23 is turned off, the drum is released, the brake 6 is activated, and the gear wear check operation is completed.

The present invention has the following effects.

(υ It has the advantage of being able to inspect the wear of the gear part in an easy way and without having to get close to the hoisting machine itself.

(2) Since the comparison is made with the set value in the initial state, errors in wear detection due to equipment variations can be minimized.

According to the present invention, wear inspection of the gear part can be carried out in a simple manner and without getting close to the hoisting machine, making maintenance inspection easier and preventing accidents caused by not inspecting.

Furthermore, since a comparison is made with the initial state set value, wear detection errors due to device variations can be minimized, thereby increasing safety.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the overall configuration of a conventional hoist, etc.
3 is a drum lock mechanism diagram, FIGS. 4 and 5 are flowcharts of the backlash measuring circuit of the present invention, and FIG. The rush measurement circuit is shown. DESCRIPTION OF SYMBOLS 1... Drum, 2... Wire rope, 3... Load block, 4... Reduction gear, 5... Hoisting mode, 6... Brake, 7... Small mode, 8...・・・
Encoder, 9... Pulse count circuit, 10...
Subtraction circuit, 12... Setting pulse circuit, 13... Display, 14... Brake lining, 15... Solenoid, 16... Spring, 17... Power supply, 18... Count display, 19 ...Light emitting diode, 20...Resistor, 2...Transistor, 22...Ditub switch, 23...Relay for driving solenoid 15, 24...
Small mode model 7 forward rotation drive relay, 25...Small mode model 7 reverse drive relay, 26...Comparator, 2
7... Phototransistor, 28-... Variable resistor,
29...Control device, 30...Switch 1.31...
・Light emitting diode, Vl...control device drive voltage pin 1, v2...control device drive voltage pin 2, DO...mold from encoder/, ROO...dips 1
Itchi 0 pin, Rol... dip switch 1 pin,
RO2...Dip switch 2 pin", RO3...Dip switch 3 pin, D4...Output pin to solenoid 3, D5...Small model normal rotation output pin, D6...
...Small model reverse output pin, Dl...Abnormal display ratio 7 pin, D8...Normal display output pin, OUT...
Count display output pin, Dl...initial state, gear wear check H state input pin, D2...control device 29.

Claims (1)

[Claims] 1. The rotation angle of one gear of the reduction gear is converted to the number of pulses by an encoder, and the backlash of the reduction gear is converted to the number of pulses by the encoder, and by comparing it with a predetermined number of pulses, A gear device wear detection device characterized by detecting wear of a gear device.