JP2007064286A - Abnormality detecting mechanism for driving cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an abnormality detecting mechanism for a driving cable capable of easily and accurately detecting the abnormality thereof by detecting a drive displacement of a driving cable and a pilot belt even when the motor output is driven at 100% or less. <P>SOLUTION: In addition to a driving cable 5, a belt 6 for the abnormality detection of a driving cable is arranged between a driving shaft S1 and a load side shaft S2 so as to detect the drive displacement of the driving cable 5 and the belt 6 for the abnormality detection of a driving cable. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a drive line abnormality detection mechanism, and more particularly to a load transmission shaft in a power transmission device that transmits drive force to a load side shaft from a drive shaft driven by a prime mover or the like. The present invention relates to an abnormality detecting mechanism for a driving rope that detects the abnormality promptly and accurately when the driving rope slips or is cut due to an overload or the like.

  Conventionally, the drive rope from the drive shaft driven by a prime mover or the like to the load side shaft, not particularly limited, for example, in a power transmission device that transmits the driving force by a belt, a chain, etc. The cause on the load shaft side is not particularly limited, but for example, if an overload occurs on the load shaft side due to the entry of foreign matter, the drive belt and the chain may slip or may be cut. In some cases, normal power transmission cannot be performed and the prime mover may be damaged.

In order to prevent this, when the load side shaft is driven by a normal motor (motor), it should be operated at a set load of 100% or less of the output of the motor, for example, about 30 to 50%, and this overload on the load side. When this occurs, an operation method is adopted in which this overload is detected on the prime mover side to stop the prime mover.
However, in this case, since the prime mover is usually operated with a set load of about 30 to 50% of the prime mover output, even if some abnormality occurs on the load side, the load is overloaded by 100% or more of the prime mover output. Otherwise, the prime mover could not be stopped, and even if an abnormality occurred in the apparatus, it was still driven, causing an unexpected accident.

  In addition, in a device that is always driven to rotate at a constant speed set on the load shaft side, if this load shaft side is overloaded and a slippage or cutting accident occurs on the drive belt or chain, this error will occur. A detector for detecting a decrease in rotation on the load side is provided for detection, but the detector for detecting the rotation abnormality on the load side is expensive and the detection system is complicated. There was a problem.

  In view of the problems of the drive line abnormality detection system, the present invention is simple and accurate by detecting the drive displacement between the drive line and the pilot belt even when driving at 100% or less of the motor output. An object of the present invention is to provide an abnormality detection mechanism for a driving rope that can detect the abnormality.

  In order to achieve the above object, the drive line abnormality detection mechanism according to the present invention includes a drive line abnormality detection belt disposed separately from the drive line between the drive shaft and the load side shaft. The present invention is characterized in that the drive displacement of the belt for detecting abnormality of the rope and the drive rope is detected.

  In this case, the drive displacement can be detected by a proximity switch system disposed on the belt side for detecting abnormality of the drive cable and on the drive cable side.

  Further, the drive displacement can be detected by a photoelectric system arranged on the belt side for detecting abnormality of the drive cable and the drive cable side.

  According to the abnormality detecting mechanism of the driving rope of the present invention, a belt for detecting abnormality of the driving rope is disposed separately from the driving rope between the driving shaft and the load side shaft, and the driving rope and the driving rope are arranged. By detecting the drive displacement with the abnormality detection belt, even when driving at 100% or less of the prime mover output, when the set overload occurs, the overload is detected immediately and the prime mover Since the engine can be stopped, damage to the prime mover can be prevented in advance, and slippage and cutting accidents caused by the drive cable can be prevented and normal power transmission can be performed.

  In addition, since the drive displacement is detected by a proximity switch system disposed on the belt side for detecting abnormality of the drive cable and the drive cable side, the structure is simple and the existing equipment is installed. It can be easily installed without major modification.

  In addition, the drive displacement is detected by the photoelectric system arranged on the belt side and the drive line side for detecting the abnormality of the drive line, so that the structure is simple and the load side shaft Abnormalities can be detected quickly and accurately, and can be easily attached to existing equipment.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a drive cable abnormality detection mechanism of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the drive cable abnormality detection mechanism of the present invention.
The embodiment shown in FIG. 1 shows a case where an abnormality detection of the driving rope is performed by the proximity switch system.
In this case, the drive shaft S1 and the load side shaft S2 that are driven directly by a motor such as a motor or via a speed reducer and the like are arranged in parallel, and the end portions of both the shafts S1 and S2 have shaft ends. May be supported by bearings B1 and B2 as necessary so as not to swing, and a power transmission mechanism D and a drive rope abnormality detection mechanism K are disposed between both shafts S1 and S2.
In this embodiment, the case where the power transmission mechanism D and the drive rope abnormality detection mechanism K are each carried out by a belt type is shown, but this can also be a chain type, which is particularly limited. It is not a thing.

Further, the drive shaft S1 and the load side shaft S2 are attached with pulleys 1 and 2 of the power transmission mechanism D and pulleys 3 and 4 of the drive rope abnormality detection mechanism K at opposite positions. Among these, the pulleys 1 and 2 and one pulley 3 of the drive cable abnormality detection mechanism K are fixed to the drive shaft S1 and the load side shaft S2 by a cotter, a bolt, etc., respectively, and the drive shaft S1 and the load side These pulleys 1, 2, and 3 are rotated together with the shaft S2, and the other pulley 4 of the drive rope abnormality detection mechanism K is connected to the load side shaft S2 via the bearing 11 and the like. Is attached to rotate freely.
And between the pulleys 1 and 2 of the power transmission mechanism D attached so as to oppose the opposing drive shaft S1 and the load side shaft S2 in this way, a power transmission belt 5 as a drive rope is provided. Further, a belt 6 for detecting the abnormality of the driving line is stretched between the pulleys 3 and 4 of the abnormality detecting mechanism K for the driving line.

  Furthermore, detectors 7 and 8 such as proximity switches are respectively provided on the fixed sides of the pulley 4 of the drive cable abnormality detection mechanism K attached to the load side shaft S2 and the side surfaces of the pulley 2 of the power transmission mechanism D. At the same time, the strikers 9 and 10 are attached to one side of the pulley 4 and the pulley 2 so as to be detected by the detectors 7 and 8. Thus, when the pulley 4 and the pulley 2 are rotated to the detectors 7 and 8 with the rotation of the drive shaft S1 and the load side shaft S2, this is detected.

  Further, the detector 7 emits an addition signal by a striker 9 and the detector 8 emits a subtraction signal by a striker 10 and is electrically wired so that both signals are input to an addition / subtraction counter 12. Thus, the abnormality detecting mechanism K for the driving rope is configured.

Next, the operation of the first embodiment of the drive cable abnormality detection mechanism of the present invention will be described.
When the drive shaft S1 is rotationally driven by driving a prime mover such as a motor, the pulleys 1 and 3 fixed to the shaft S1 are rotationally driven at a constant speed, respectively, and this is connected to the load side shaft via the belts 5 and 6. The load side shaft S2 is driven to rotate through pulleys 2 and 4 attached to the S2 side.
At this time, when the load side shaft S2 is driven within the set load range, the power transmission belt 5 serving as the drive cable and the drive cable abnormality detecting belt 6 (pilot belt) rotate in the same cycle. To do. Of course, in this case, the pulleys 2 and 4 are each driven at a constant speed, so that the addition signal and the subtraction signal by the detectors 7 and 8 disposed on the side portions are connected at regular intervals, and the addition / subtraction counter 12 is connected. Therefore, the calculation output in the addition / subtraction counter 12 is “0” and is not output to the outside of the addition / subtraction counter 12, so no abnormality is detected.

However, the load side shaft S2 side is not particularly limited. For example, when an overload exceeding a set load occurs due to the biting of foreign matter, the power transmission belt 5 serving as a drive rope is Since the pulleys 1 and 2 are respectively fixed to the drive shaft S1 and the load side shaft S2 with fixing tools, the pulley 2 stops at the same time as the load side shaft S2 at a speed slower than the set speed or when the belt is cut. However, since the pulley 4 on the load side shaft S2 on which the belt 6 for detecting abnormality of the drive cable is stretched is attached via a bearing 11 or the like, the pulley 4 is at the same speed as the drive shaft S1. The rotation will continue.
Thereby, the rotation synchronization of the two belts 5 and 6 with both pulleys 2 and 4 is shifted. As a result, the rotational speeds of the pulleys 2 and 4 are different, and due to this rotational difference (drive displacement), the addition signal from the detector 7 and the subtraction signal from the detector 8 become indefinite intervals, and the addition / subtraction counter 12 When the belt is cut, only the addition signal from the detector 7 is input, and the calculation output in the addition / subtraction counter 12 is “1”, and a failure signal is output to the outside of the addition / subtraction counter 12. Therefore, the occurrence of an abnormality can be detected.
In this embodiment as well, when an abnormality occurs, the prime mover can be stopped and the operator can be informed of the occurrence of the abnormality by an alarm device or the like.

FIG. 2 shows a second embodiment of the drive cable abnormality detection mechanism of the present invention.
The second embodiment shows a case where the abnormality of the driving rope is detected by the photoelectric system.
Providing the pulleys 1 and 2 of the power transmission mechanism D disposed opposite to the drive shaft S1 and the load side shaft S2, respectively, and the pulleys 3 and 4 of the drive rope abnormality detection mechanism K are the first. Since it is the same as an Example, the detailed description is abbreviate | omitted.

In this second embodiment, the pulley 2 of the power transmission mechanism D and the pulley 4 of the drive rope abnormality detection mechanism K have one through-hole 2h, 4h at the same position and on the same line at the pulley rotation fixed position. Drill so as to be. The size of the through-holes 2h and 4h only needs to transmit light emitted from the projector.
Further, this is not particularly limited. For example, it is not particularly limited to the side of one pulley 4 and the same position as the through hole 4h. For example, an infrared light emitter or a laser light emitter A light receiver 21 is arranged on the side of the pulley 2 so as to be in the same position as the through hole 2h so that an optical signal emitted from the light projector 20 can be received. The subtracted signal received by the optical receiver 21 through the through holes 2h and 4h of the pulleys 2 and 4 is input to the adder / subtractor counter 12 as the optical signal emitted from the pulley 20, and a reference signal separately provided. The addition signal from the generator 22 is configured to be input to the same addition / subtraction counter 12.

Next, the operation of the second embodiment of the drive cable abnormality detection mechanism of the present invention will be described.
When the drive shaft S1 is rotationally driven by driving a prime mover such as a motor, the pulleys 1 and 3 fixed to the shaft S1 are rotationally driven at a constant speed, respectively, and this is connected to the load side shaft via the belts 5 and 6. The load-side shaft S2 is rotationally driven through pulleys 2 and 4 attached to the S2 side. At this time, when the load-side shaft S2 is driven within the set load range, a pulley in which both belts 5 and 6 are stretched. 2 and 4 are synchronously driven and driven at the same speed, so that the light emitted from the projector 20 disposed on the side portion is equally spaced, and passes through the through holes 2h and 4h of both pulleys rotating at the same speed. Light is received at 21. As shown in FIG. 3, the light receiving unit 21 receives the subtraction signals at equal intervals and outputs the subtraction signals to the addition / subtraction counter 12 and the addition signal from the reference signal generator 22 at equal intervals. Therefore, the calculation output in the addition / subtraction counter 12 is “0” and is not output to the outside of the addition / subtraction counter 12, so that no abnormality is detected.

However, the load side shaft S2 side is not particularly limited. For example, when an excessive load exceeding the set load occurs due to the biting of foreign matter, the pulley 2 rotates at the same speed as the load side shaft S2. On the other hand, since the pulley 4 is attached via a bearing 11 or the like, the pulley 4 rotates at the same speed as the drive shaft S1, thereby the belts 5 and 6 are rotated in the same cycle. The rotation is stopped and the drive rotation speed between the pulleys 2 and 4 is different, or the load side shaft S2 is stopped. By this rotation difference (drive displacement), the addition signal from the reference signal generator 22 Even if the signals are input to the addition / subtraction counter 12 at equal intervals, the subtraction signal from the light receiver 21 is not input at equal intervals, so that the calculation output in the addition / subtraction counter 12 is "1". Since the 12 outside of the output as a fault signal, it is possible to detect an abnormal occurrence.
When an abnormality occurs, the prime mover can be stopped and the operator can be informed of the occurrence of the abnormality by an alarm device or the like.

  The drive rope abnormality detection mechanism of the present invention has been described based on a plurality of embodiments. However, the present invention is not limited to the configurations described in the above embodiments, and the purpose of the combination, etc. The configuration can be changed as appropriate without departing from the scope of the invention.

  The drive line abnormality detection mechanism according to the present invention is configured so that when driving at 100% or less of the motor output, if the drive line slips or is cut due to an overload generated on the load side shaft, the drive line Since it has the characteristic of detecting the drive displacement between the strip and the pilot belt easily and accurately, the abnormality can be detected quickly and accurately. For example, it can be used for various power transmission mechanisms.

It is explanatory drawing which shows 1st Example of the abnormality detection mechanism of the drive rope of this invention. It is explanatory drawing which shows 2nd Example of the abnormality detection mechanism of the drive rope of this invention. It is explanatory drawing which detects the normality and abnormality of the subtraction signal with respect to the reference signal in 2nd Example.

Explanation of symbols

S1 Drive shaft S2 Load side shaft D Power transmission mechanism K Abnormality detection mechanism of drive line 1 Pulley of power transmission mechanism 2 Pulley of power transmission mechanism 2h Through hole 3 Pulley of abnormality detection mechanism of drive line 4 Abnormality of drive line Pulley of detection mechanism 4h Through hole 5 Drive cord (belt)
6 Belt for detecting abnormality of driving rope 7 Detector 8 Detector 9 Striker 10 Striker 11 Bearing 12 Addition / subtraction counter 20 Floodlight 21 Light receiver 22 Reference signal generator

Claims (3)

  Between the drive shaft and the load side shaft, a belt for detecting abnormality of the drive cable is disposed separately from the drive cable, and the drive displacement between the drive cable and the belt for detecting abnormality of the drive cable is detected. An abnormality detection mechanism for a driving rope, characterized in that it is configured as described above.   2. An abnormality detection of a drive rope according to claim 1, wherein the drive displacement is detected by a proximity switch disposed on the belt side and the drive rope side for detecting an abnormality of the drive rope. mechanism.   2. An abnormality detection of a driving rope according to claim 1, wherein the detection of the driving displacement is performed by a photoelectric system arranged on the belt side for detecting an abnormality of the driving rope and the driving rope side. mechanism.

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