JP2008133918A - Method for detecting abnormality of flexible-body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for widely detecting an abnormality of a flexible-body for surely detecting an abnormality in the flexible body and avoiding a trouble occurring directly after operation of a transmission to inhibit disturbance in production process, decrease in manufacturing efficiency, and danger accompanying breakage and scattering of a belt regardless of the presence or absence of reinforcing wire rods. <P>SOLUTION: In the method for detecting an abnormality of a flexible-body, on the basis of the relative relationship between a deflection (δ) of the belt 4 in the belt transmission mechanism 1 and a tension (F) associated therewith, the deflection (δ) and the tension (F) are distinguished in two ranges, that is, a normal range A where the transmission mechanism 1 can perform a normal operation in the relationship between the deflection (δ) and the tension (F), and abnormal ranges B, C where the normal operation is hindered. The two distinguished ranges are stored beforehand in a memory. When at least either one of the deflection (δ) detected by a deflection detector 7, and the tension (F) detected by a tension detector 10 is determined to be in the category of the abnormal ranges B, C stored in the memory 11, the belt 4 is recognized to be abnormal. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a flexible body abnormality detection method, and more particularly, to a flexible body abnormality detection method for detecting a belt abnormality in a belt transmission mechanism.

Conventionally, as an abnormality detection device for a flexible body, a light beam is irradiated in the width direction of a belt by a beam irradiation unit, and a part of the light beam is received by a light receiving unit on the opposite side of the belt, or the light beam Is reflected on the same side as the beam irradiating means by the light receiving means, and the amount of bending of the belt is detected by the amplitude of the output fluctuation of the light receiving means. Has recognized that it is an abnormal belt and has taken measures such as replacing it before the occurrence of a serious situation to ensure maintenance.
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On the other hand, in a belt in which a plurality of reinforcing metal wires are provided in an electrically insulated state, when a predetermined voltage is applied to each reinforcing metal wire, the abnormality of the belt due to breakage or stretching of each reinforcing metal wire is applied. Also known is a method of detecting abnormality of the belt based on the abnormality of the reinforcing metal wire based on the abnormality of the reinforcing metal wire based on the detected change in the current value.
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JP-A-5-71602 Japanese Patent Laid-Open No. 2003-14680

  Since the technique described in Patent Document 1 is configured to detect the amount of bending of the belt in a state where the belt transmission mechanism is operated, the amount of bending of the belt due to some cause before the operation of the transmission mechanism. Even if an abnormal situation with a large occurrence occurs, this abnormal situation can only be detected after the transmission mechanism is in operation. For this reason, the transmission mechanism may be stopped immediately after the operation of the transmission mechanism, and repairs such as adjusting the amount of bending of the belt or replacing the belt may be required. Accordingly, since the operation of the device equipped with the transmission mechanism is stopped during the repair, various adverse effects such as, for example, disruption of the manufacturing process or reduction in manufacturing efficiency are generated. In some cases, the belt may be broken and scattered immediately after the operation of the transmission mechanism, and there is a problem that the belt breaks and scatters immediately after the operation is dangerous.

  On the other hand, although the technique described in Patent Document 2 is capable of detecting abnormality of a belt in which a plurality of reinforcing metal wires are provided in an electrically insulated state as reinforcing wires, reinforcement made of an electrically insulating material is possible. It is impossible to detect abnormalities in belts with wires or belts made of non-conductive materials that do not have reinforcing wires, so the types of belts that can be detected abnormally are limited and the detection range is narrow. Have.

  The present invention solves such a problem, and an object of the present invention is not only to be able to reliably detect abnormality of the flexible body by a simple method, but also immediately after operation of the flexible body transmission mechanism. By avoiding the occurrence of troubles, maintenance can be avoided by avoiding disturbances in the manufacturing process, lowering of manufacturing efficiency, or dangers associated with belt breakage and scattering, and there is a wide range without being restricted by the presence or absence of various reinforcing wires. Another object of the present invention is to provide a flexible body abnormality detection method capable of detecting abnormality.

  In order to achieve the above object, the abnormality detection method for a flexible body according to the present invention provides a relative amount of bending of the flexible body of the flexible body transmission mechanism and the tension of the flexible body corresponding to the amount of bending. From the relationship, the storage means for preliminarily storing the bending amount and the tension separately in two regions, a normal region where the normal operation of the transmission mechanism can be performed and an abnormal region where normal operation is hindered, and the bending of the flexible body A deflection amount detection means for detecting the amount; and a tension detection means for detecting the tension of the flexible body. At least one of the deflection amount and the tension of the flexible body detected by the detection means is the storage means. It is possible to determine whether it belongs to the category of the abnormal range by determining whether it belongs to the normal range or the abnormal range of the bending amount stored in It is characterized by recognizing that the flexible body is abnormal.

  According to this, in the flexible body transmission mechanism, the amount of flexure of the flexible body and the tension have a relative relationship, so at least one of the amount of flexure of the flexible body and the tension detected by the detecting means. Is determined to belong to the category of the abnormal region of the deflection amount stored in the storage unit, or is determined to belong to the category of the abnormal region of the tension stored in the storage unit. It can be recognized that the determined flexible body is abnormal. In addition, the abnormality of the flexible body can be detected in a wide range regardless of the presence or absence of various reinforcing wires.

  In order to achieve the above object, a flexible body abnormality detection method according to the present invention includes a bending amount of the flexible body of a flexible body transmission mechanism and a tension of the flexible body corresponding to the bending amount, From the relative relationship between the length of the flexible body and the number of operating the transmission mechanism, the amount of bending, the tension, the length of the extension, and the number of operating the transmission mechanism are within the normal range where the transmission mechanism can operate normally. Storage means for distinguishing and storing in advance in two areas, an abnormal area where normal operation is hindered, a deflection amount detection means for detecting the deflection amount of the flexible body, and a tension detection means for detecting the tension of the flexible body And an extension length detecting means for detecting the extension length of the flexible body, and an operation number detecting means for detecting the operation number of the transmission mechanism, and the amount of flexure of the flexible body detected by the detection means At least one of the tension, the tension length, and the number of operation of the transmission mechanism is stored in the storage means. Use the discrimination means to determine whether it belongs to the normal range and abnormal range of tension, normal range and abnormal range of tension, normal range and abnormal range of the extension length, or normal range and abnormal range of the number of operation of the transmission mechanism It is characterized by recognizing that the flexible body determined to belong to the category of the abnormal region is abnormal.

  According to this, in the flexible transmission mechanism, since the flexure amount, tension, extension length, and number of operation of the transmission mechanism have a relative relationship, the flexible body detected by the detection means It is determined that at least one of the deflection amount, the tension, the tension length, and the number of operation of the transmission mechanism belongs to the abnormal range category of the deflection amount stored in the storage means, or is stored in the storage means. It is determined that it belongs to the category of the abnormal area of the tension that is stored, it is determined that it belongs to the category of the abnormal area of the tension length stored in the storage means, or is stored in the storage means If the discriminating means determines that the transmission mechanism is in the abnormal range category, it can be recognized that the determined flexible body is abnormal. In addition, the abnormality of the flexible body can be detected in a wide range regardless of the presence or absence of various reinforcing wires.

  In the present invention, it is desirable to detect an abnormality of the flexible body when the transmission mechanism is stopped. According to this, since the transmission mechanism in which the flexible body belonging to the category of the normal range is stretched can be operated, it is possible to avoid the occurrence of trouble immediately after the transmission mechanism is operated. Therefore, maintenance can be achieved while avoiding the dangers associated with the disturbance of the manufacturing process, the reduction in manufacturing efficiency, or the breakage and scattering of the flexible body.

  Further, the present invention stores in the storage means the maintenance operation number before the limit operation number of the transmission mechanism, and determines whether or not the operation number of the transmission mechanism detected by the operation number detection means has reached the maintenance operation number. It is characterized in that the operation of the transmission mechanism determined by the determining means and determined to have reached the number of maintenance operations is stopped. According to this, since the operation of the transmission mechanism can be stopped when the number of operation of the transmission mechanism reaches the maintenance operation number, effective measures such as exchanging the flexible body before the abnormality occurs in the flexible body should be taken. Can be maintained.

  According to the present invention, in the flexible body transmission mechanism, the bending amount, tension, tensioning length, and number of operation of the transmission mechanism are detected, and at least one of the detected values is stored in the storage means. With a simple method of discriminating with the discriminating means whether the deflection amount, tension, tension length and transmission mechanism operating number stored in advance are in the normal range or abnormal range, In addition to being able to detect abnormalities in the flexible body, it is also possible to detect abnormalities when the transmission mechanism is stopped, eliminating the need for repairs immediately after the transmission mechanism is operated, thereby disturbing the manufacturing process, reducing manufacturing efficiency, or breaking the flexible body It is possible to maintain by avoiding the dangers associated with scattering. In addition, the abnormality of the flexible body can be detected over a wide range regardless of the presence or absence of the reinforcing wire.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram showing an example of a belt transmission mechanism in which an abnormality is detected by the abnormality detection method for a flexible body according to the present invention, FIG. 2 is a block diagram of an abnormality detection control circuit of the first embodiment, and FIG. It is a graph which shows the relative relationship of bending amount ((delta)) of a flexible body, and tension | tensile_strength (F). 1 to 3, a belt transmission mechanism (flexible body transmission mechanism) 1 includes a driving vehicle 2, a driven vehicle 3, and an endless belt (endless flexible body) 4, and the endless belt 4 is driven by the driving vehicle 2. The motor vehicle 2 is stretched around the vehicle 3 and is driven to rotate in the direction of arrow R by an electric motor 5 such as a numerically controllable AC / DC servo motor or induction motor mounted on the rotary shaft 2a. . The endless belt 4 may be any of a flat belt, a V belt, a U belt, a toothed belt, and the like. Further, it is made of a flexible material such as leather, synthetic rubber, synthetic resin or a reinforced composite of synthetic rubber and reinforcing fiber, a reinforced composite of synthetic resin and reinforcing fiber, a reinforcing wire made of a metal wire or an electrical insulating material. The presence or absence of reinforcement with a reinforcing wire made of is not limited.

  While the belt transmission mechanism 1 is in a stopped state, the bending generation means 6 generates a bending on the tension side 4a of the endless belt 4, and the bending amount at that time is detected by the bending amount detection means 7. The detected bending amount is sent to the discrimination means 8. Output. The deflection generating means 6 is composed of a pressing mechanism that presses the tension side 4a of the endless belt 4 from above to below with a predetermined pressing force, and is in the middle (S / 2) of the center distance S between the driving vehicle 2 and the driven vehicle 3. It arrange | positions and the tension | pulling side 4a of the endless belt 4 is pressed vertically downward with a predetermined pressing force.

  The amount of deflection of the tension side 4a and the tension of the tension side 4a corresponding to the amount of deflection are in a relative relationship that is approximately inversely proportional. That is, when the tension side 4a is bent by a predetermined amount of bending, the tension of the bent side 4a is approximately inversely proportional to the predetermined amount of bending. Therefore, if the deflection amount detected by the deflection amount detection means 7 is output to the tension detection means 10, the tension detection means 10 can convert the deflection amount of the tension side 4a into the tension of the tension side 4a and detect it. . The tension detected by the tension detection means 10 is output to the discrimination means 8. On the other hand, if the tension detected by the tension detection means 10 is output to the deflection amount detection means 7, the deflection amount detection means 7 can detect the tension on the tension side 4a by converting the tension on the tension side 4a. .

  In the present embodiment, even if both the deflection amount detected by the deflection amount detection means 7 and the tension detected by the tension detection means 10 are output to the discrimination means 8, only the deflection amount detected by the deflection amount detection means 7 is determined. 8, or only the tension detected by the tension detection unit 10 may be output to the determination unit 8.

  The storage means 11 determines the amount of deflection and tension from the relative amount of the deflection of the tension side 4a of the endless belt 4 and the tension of the tension side 4a corresponding to the amount of deflection. Two areas, a normal area where possible and an abnormal area in which normal operation is hindered, are stored in advance, and the two areas, the normal area and the abnormal area, are input to the determination unit 8. The determination means 8 is incorporated in a control circuit (control means) 9. The control circuit 9 is input with the operation state or the stop state of the belt transmission mechanism 1.

  A normal endless belt 4 capable of properly transmitting power from the driving vehicle 2 to the driven vehicle 3 in FIG. 1 to realize the operation of the belt transmission mechanism 1 is configured such that the tension side 4a is bent vertically downward with a predetermined pressing force by the bending generating means 6. It has already been confirmed that the amount of bending and the tension when pressed against each other have a relative relationship and belong to the category of the normal region A indicated by the oblique lines in FIG. That is, in the case of the normal endless belt 4, the amount of deflection (δ) when the tension side 4a indicated by the solid line a in FIG. It falls within the range of the reference value δ1 (see also FIG. 3) bent to the position shown by b to the allowable value δ2 (see also FIG. 3) bent to the position shown by the broken line c. Further, as shown in FIG. 3, the tension (F) of the tension side 4a falls within the range of the reference value f1 to the allowable value f2 corresponding to the reference value δ1 of bending and the allowable value δ2 of bending. That is, the deflection amount (δ) and tension (F) of the normal endless belt 4 belong to the category of the normal region A indicated by the oblique lines in FIG. 3 in which the belt transmission mechanism 1 (see FIG. 1) can operate normally. I understand.

  On the other hand, when the tension side 4a indicated by the solid line a in FIG. 4 is pressed vertically downward by the deflection generation means 6 with a predetermined pressing force, the deflection amount (δ) of the tension side 4a exceeds the position indicated by the broken line c. As shown in FIG. 3, the tension (F) of the tension side 4a increases from the allowable value f2, as shown in FIG. Is also reduced to a small undervalue f3. In this way, when the amount of deflection (δ) increases to the excessive value δ3 and the tension (F) decreases to the undervalue f3 and belongs to the category of the abnormal region B that deviates from the category of the normal region A indicated by hatching, The endless belt 4 means that the deflection is excessive due to deterioration over time, and it is difficult to transmit power from the driving vehicle 2 to the driven vehicle 3 in FIG. It can be recognized that the belt drive mechanism 1 is broken and prevents normal operation of the belt transmission mechanism 1. This makes it necessary to replace the endless belt 4 immediately.

  On the other hand, when the tension side 4a indicated by the solid line a in FIG. 4 is pressed vertically downward by the deflection generation means 6 with a predetermined pressing force, the deflection amount (δ) of the tension side 4a is higher than the position indicated by the thick line b. Correspondingly, the tension value (F) of the tension side 4a decreases to an undervalue δ4 indicated by a two-dot chain line e (see also FIG. 3), and an overvalue f4 larger than the reference value f1 as shown in FIG. To increase. In this way, when the deflection amount (δ) decreases to the undervalue δ4 and the tension (F) increases to the overvalue f4 and belongs to the category of the abnormal region C that deviates from the category of the normal region A indicated by hatching, The endless belt 4 means that the initial tension when it is wound around the driving vehicle 2 and the driven vehicle 3 is too large, and it can be recognized that the normal operation of the belt transmission mechanism 1 is hindered. Accordingly, it is necessary to adjust the initial tension to an appropriate value by setting the inter-shaft distance S between the driving vehicle 2 and the driven vehicle 3 in FIG. 1 to be small.

  Therefore, the storage means 11 in FIG. 2 has the deflection (δ) shown in FIG. 3 within the range from the reference value δ1 to the allowable value δ2, and the tension (F) within the range from the reference value f1 to the allowable value f2. Thus, the normal region A indicated by the oblique lines in which the belt transmission mechanism 1 (see FIG. 1) can operate normally, the deflection amount (δ) protrudes from the reference value δ1 to the allowable value δ2, and the tension (F) is increased. By projecting out of the range from the reference value f1 to the allowable value f2, the two regions A and B, which are the abnormal region B in which normal operation of the belt transmission mechanism 1 (see FIG. 1) is prevented, are stored in advance.

  Next, the abnormality detection procedure for the flexible body according to the first embodiment having the above-described configuration will be described. FIG. 5 is a flowchart showing the abnormality detection procedure of the first embodiment. 1 to 5, the operation or stop of the belt transmission mechanism 1 is monitored (step 1 in FIG. 5). When the belt transmission mechanism 1 is stopped, the bending side 4 a of the endless belt 4 is bent by the bending generation means 6. To generate a deflection (step 2 in FIG. 5). If the belt transmission mechanism 1 is operating in step 1, the operation of returning to step 1 is repeated until the belt transmission mechanism 1 stops. The deflection amount (δ) generated on the tension side 4a in step 2 is detected by the deflection amount detection means 7 (step 3 in FIG. 5), and the detected deflection amount (δ) is output to the discrimination means 8. Since the discriminating means 8 is input from the storage means 11 with two areas of the normal area A and abnormal areas (B, C) of the deflection amount (δ) of the tension side 4a, it is detected by the deflection amount detection means 7. It is determined whether the deflection amount (δ) belongs to the normal range A or the abnormal range (B, C) (step 4 in FIG. 5). Further, the deflection amount (δ) detected in the step 3 is output to the tension detecting means 10. The tension detecting means 10 detects the amount of deflection of the tension side 4a by converting it into the tension of the tension side 4a (step 5 in FIG. 5), and outputs the detected tension (F) to the determination means 8. Since the discriminating means 8 is input from the storage means 11 with two areas, the normal area A and the abnormal area (B, C) of the tension (F) on the tension side 4a, the tension detected by the tension detecting means 10 It is determined whether (F) belongs to either the normal range A or the abnormal range (B, C) (step 4 in FIG. 5).

  In step 4, the deflection amount (δ) belongs to the normal range A range from the reference value δ1 to the allowable value δ2, and the tension (F) belongs to the normal range A range from the reference value f1 to the allowable value f2. The determined endless belt 4 is recognized as a normal belt (step 6 in FIG. 5). Therefore, the endless belt 4 can be used without hindering the subsequent operation of the belt transmission mechanism 1.

  The endless belt 4 in which it is determined in step 4 that the deflection amount (δ) belongs to the category of the abnormal region B with the overvalue δ3 and the tension (F) belongs to the category of the abnormal region B with the undervalue f3 is: This means that the deflection is excessive due to deterioration with time, and it is difficult to transmit power from the driving vehicle 2 to the driven vehicle 3 in FIG. Recognizing that the belt is an abnormal endless belt 4 that prevents normal operation of the mechanism 1 (step 7 in FIG. 5), the notification means 12 such as a buzzer and a lamp is turned on to notify the abnormality (FIG. 5). Step 8).

  The endless belt 4 in which it is determined in step 4 that the deflection amount (δ) belongs to the category of the abnormal region C with the undervalue δ4 and the tension (F) belongs to the category of the abnormal region C with the overvalue f4, It means that the initial tension when the belt is wound around the driving vehicle 2 and the driven vehicle 3 is too large, and that the belt end mechanism 4 is recognized as an abnormal endless belt 4 that prevents normal operation of the belt transmission mechanism 1 (see FIG. Step 7) in FIG. 5 and the notification means 12 such as a buzzer sounding and a lamp lighting are operated to notify the abnormality (Step 8 in FIG. 5).

  In the abnormality detection procedure for the flexible body according to the first embodiment, both the deflection amount (δ) detected by the deflection amount detection means 7 and the tension (F) detected by the tension detection means 10 are stored in the storage means 11. The discriminating means 8 discriminates between the normal range A and the abnormal range (B, C) of the deflection amount (δ) and the tension (F), but the flexure amount detection means 7 Either the detected deflection amount (δ) or the tension (F) detected by the tension detection means 10 is the normal area A or abnormal area of the deflection amount (δ) or tension (F) stored in the storage means 11. It may be a procedure in which the discriminating means 8 discriminates which category (B, C) it belongs to.

  Further, the deflection amount (δ) of the tension side 4a detected by the deflection amount detection means 7 is output to the tension detection means 10, and the tension detection means 10 converts the deflection amount of the tension side 4a into the tension of the tension side 4a. The detected tension (F) is output to the discriminating means 8, but the tension (F) of the tension side 4a detected by the tension detecting means 10 is output to the deflection amount detecting means 7 to detect the deflection amount. The means 7 may detect the tension (F) of the tension side 4 a by converting it into the deflection amount (δ) of the tension side 4 a, and output the converted deflection amount (δ) to the determination means 8.

  Next, a second embodiment of the present invention will be described based on FIGS. 1, 3, 4 and 6 (a block diagram of the abnormality detection control circuit of the second embodiment). Note that the same parts as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted.

  As described above, the bending amount of the tension side 4a of the endless belt 4 and the tension of the tension side 4a corresponding to the bending amount are in a substantially inversely proportional relationship. Further, the bending amount of the tension side 4a and the tension length of the tension side 4a corresponding to the deflection amount, that is, the actual length of the tension side 4a existing in the inter-axis distance S are substantially proportional to each other. The amount of bending of 4a and the number of operation of the belt transmission mechanism 1 corresponding to the amount of bending are also in a relative relationship that is substantially proportional. For this reason, if the deflection amount of the tension side 4a detected by the deflection amount detection means 7 is output to the tension length detection means 13, the tension length detection means 13 determines the deflection amount of the tension side 4a. It can be detected by converting to the installation length. The tension length of the tension side 4 a detected by the tension length detection means 13 is output to the determination means 8. If the deflection amount of the tension side 4a detected by the deflection amount detection means 7 is output to the operation number detection means 14, the operation number detection means 14 converts the deflection amount of the tension side 4a into the operation number of the belt transmission mechanism 1 and detects it. can do. The number of operations detected by the operation number detection means 14 is output to the determination means 8.

  On the other hand, if the tension on the tension side 4a detected by the tension detection means 10 is output to the tension length detection means 13, the tension length detection means 13 causes the tension on the tension side 4a to be equal to the tension length of the tension side 4a. If the tension on the tension side 4a detected by the tension detection means 10 is output to the operation number detection means 14, the operation number detection means 14 converts the tension on the tension side 4a into the number of operations of the belt transmission mechanism 1. It can be detected by conversion. Further, if the tension length 4a detected by the tension length detection means 13 is output to the deflection amount detection means 7, the deflection amount detection means 7 determines the tension length of the tension side 4a. If the tension length of the tension side 4a detected by the tension length detection means 13 is output to the tension detection means 10, the tension detection means 10 will detect the tension length of the tension side 4a. If the tension is detected by converting the tension to the tension on the tension side 4a, and the tension length on the tension side 4a detected by the tension length detection means 13 is output to the number-of-operations detection means 14, The tension length of the tension side 4a can be converted into the number of operating belt transmission mechanisms 1 and detected. Further, if the operation number of the belt transmission mechanism 1 detected by the operation number detection means 14 is output to the deflection amount detection means 7, the deflection amount detection means 7 converts the operation number of the belt transmission mechanism 1 into the deflection amount of the tension side 4a. If the operation number of the belt transmission mechanism 1 detected by the operation number detection means 14 is output to the tension detection means 10, the tension detection means 10 converts the operation number of the belt transmission mechanism 1 into the tension on the tension side 4a. If the number of operations of the belt transmission mechanism 1 detected by the operation number detection means 14 is output to the extension length detection means 13, the extension length detection means 13 increases the number of operations of the belt transmission mechanism 1. It can be detected by converting into the stretched length of the side 4a.

  In the second embodiment, the deflection amount detected by the deflection amount detection means 7, the tension detected by the tension detection means 10, the tension length detected by the tension length detection means 13, and the operation detected by the operation number detection means 14. Even if all of the numbers are output to the determination unit 8, only at least one of the deflection amount, the tension, the tension length, and the number of operations may be output to the determination unit 8.

  The storage means 11 is based on the relative relationship between the bending amount of the tension side 4a of the endless belt 4, the tension of the tension side 4a corresponding to the bending amount, the tension length of the tension side 4a, and the number of operations of the belt transmission mechanism 1. The amount of deflection, tension, tension length and number of operations are stored in advance separately in two regions, a normal region where the belt transmission mechanism 1 can operate normally and an abnormal region where normal operation is hindered. Two areas, a normal area and an abnormal area, are input to the determination means 8.

  A normal endless belt 4 capable of properly transmitting power from the driving vehicle 2 to the driven vehicle 3 in FIG. 1 to realize the operation of the belt transmission mechanism 1 is configured such that the tension side 4a is bent vertically downward with a predetermined pressing force by the bending generating means 6. It has already been confirmed that the amount of bending when pressed to the distance, the extension length and the number of operations are in a relative relationship and belong to the category of the normal region A indicated by the oblique lines in FIG. That is, in the case of the normal endless belt 4, the amount of deflection (δ) when the tension side 4a indicated by the solid line a in FIG. It falls within the range of the allowable value δ2 (see also FIG. 7) bent from the reference value δ1 (see also FIG. 7) to the position shown by the broken line c. Further, as shown in FIG. 7, the stretched length (L) of the tension side 4a falls within the range of the reference value l1 to the allowable value l2 corresponding to the reference value δ1 of bending and the allowable value δ2 of bending, The number of operations (N) falls within the range from the reference value n1 to the allowable value n2. That is, the amount of deflection (δ), the stretched length (L), and the number of operations (N) of the normal endless belt 4 are indicated by hatched lines in FIG. 7 where the belt transmission mechanism 1 (see FIG. 1) can operate normally. It can be seen that it belongs to the normal range A category.

  On the other hand, when the tension side 4a indicated by the solid line a in FIG. 4 is pressed vertically downward by the deflection generation means 6 with a predetermined pressing force, the deflection amount (δ) of the tension side 4a exceeds the position indicated by the broken line c. The excessive value δ3 (see also FIG. 7) greatly bent to the position indicated by the alternate long and short dash line d increases, and the extension length (L) of the tension side 4a correspondingly corresponds to the allowable value as shown in FIG. The excessive value l3 larger than l2 increases, and the operating number (N) increases to the excessive value n3 larger than the allowable value n2. In this way, the deflection amount (δ) increases to the excessive value δ3, the extension length (L) increases to the excessive value l3, and the number of operations (N) increases to the excessive value n3, which is indicated by diagonal lines. If the endless belt 4 belongs to the category of the abnormal region B that is out of the category of the region A, it means that the endless belt 4 is excessively bent due to deterioration with time, and is no longer the driving vehicle 2 to the driven vehicle 3 of FIG. It can be recognized that it is difficult to properly transmit power, and that the normal operation of the belt transmission mechanism 1 is hindered by being damaged or broken in a short time. This makes it necessary to replace the endless belt 4 immediately.

  On the other hand, when the tension side 4a indicated by the solid line a in FIG. 4 is pressed vertically downward by the deflection generation means 6 with a predetermined pressing force, the deflection amount (δ) of the tension side 4a is higher than the position indicated by the thick line b. The underlined value δ4 indicated by the two-dot chain line e (see also FIG. 7) is reduced, and the extension length (L) of the tension side 4a is correspondingly smaller than the reference value l1 as shown in FIG. Decrease to undervalue l4. In this way, the amount of deflection (δ) decreases to the undervalue δ4, the extension length (L) decreases to the undervalue l4, and belongs to the category of the abnormal region C that deviates from the category of the normal region A indicated by hatching. The endless belt 4 means that the initial tension when the endless belt 4 is wound around the driving vehicle 2 and the driven vehicle 3 is too large, and it can be recognized that the normal operation of the belt transmission mechanism 1 is hindered. Accordingly, it is necessary to adjust the initial tension to an appropriate value by setting the inter-shaft distance S between the driving vehicle 2 and the driven vehicle 3 in FIG. 1 to be small. If the number (N) of the belt transmission mechanism 1 is l4 which is less than the allowable value n2, it may be ignored.

  Accordingly, the storage means 11 in FIG. 6 has the deflection amount (δ) shown in FIG. 7 within the range from the reference value δ1 to the allowable value δ2, and the tension (F) within the range from the reference value f1 to the allowable value f2. The belt transmission mechanism 1 (see FIG. 1) can be operated normally by setting the installation length (L) within the range of the reference value l1 to the allowable value l2 and the operating number (N) within the allowable value n2. The normal area A indicated by hatching, the deflection amount (δ) protrudes outside the range from the reference value δ1 to the allowable value δ2, the tension (F) extends outside the range from the reference value f1 to the allowable value f2, and the tension length ( L) is out of the range from the reference value l1 to the allowable value l2, and the operation number (N) is out of the range of the allowable value n2, thereby preventing normal operation of the belt transmission mechanism 1 (see FIG. 1). Two areas A and B with area B are distinguished and stored in advance.

  Next, the abnormality detection procedure for the flexible body according to the second embodiment having the above-described configuration will be described. FIG. 8 is a flowchart showing the abnormality detection procedure of the second embodiment. 1, 3, 4, 6, 7, and 8, the operation or stop of the belt transmission mechanism 1 is monitored (step 1 in FIG. 8). When the belt transmission mechanism 1 is stopped, The bending side 6a of the endless belt 4 is pressed by the bending generating means 6 to generate the bending (step 2 in FIG. 8). If the belt transmission mechanism 1 is operating in step 1, the operation of returning to step 1 is repeated until the belt transmission mechanism 1 stops. The amount of deflection (δ) generated on the tension side 4a in step 2 is detected by the amount of deflection detection means 7 (step 3 in FIG. 8), and the detected amount of deflection (δ) is output to the determination means 8. Since the discriminating means 8 is input from the storage means 11 with two areas of the normal area A and abnormal areas (B, C) of the deflection amount (δ) of the tension side 4a, it is detected by the deflection amount detection means 7. It is determined whether the deflection amount (δ) belongs to the normal region A or the abnormal region (B, C) (step 4 in FIG. 8). Further, the deflection amount (δ) detected in the step 3 is output to the tension detecting means 10. The tension detecting means 10 detects the amount of deflection of the tension side 4a by converting it into the tension of the tension side 4a (step 5 in FIG. 8), and outputs the detected tension (F) to the determination means 8. Since the discriminating means 8 is input from the storage means 11 with two areas, the normal area A and the abnormal area (B, C) of the tension (F) on the tension side 4a, the tension detected by the tension detecting means 10 It is determined whether (F) belongs to either the normal range A or the abnormal range (B, C) (step 4 in FIG. 8).

  Further, the deflection amount (δ) detected in the step 3 is output to the stretched length detection means 13. The tension length detection means 13 detects the amount of deflection of the tension side 4a by converting it into the tension length of the tension side 4a (step 6 in FIG. 8), and determines the detected tension length (L). 8 is output. Since the discriminating means 8 is input from the storage means 11 with two areas of the normal area A and the abnormal area (B, C) of the extension length (L) on the extension side 4a, the extension length detection means It is determined whether the extension length (L) detected by 13 belongs to either the normal range A or the abnormal range (B, C) (step 4 in FIG. 8). Furthermore, the deflection amount (δ) detected in step 3 is output to the operating number detection means 14. The operating number detecting means 14 detects the amount of bending of the tension side 4a by converting it into the operating number of the belt transmission mechanism 1 (step 7 in FIG. 8), and outputs the detected operating number (N) to the determining means 8. Since the discriminating means 8 is input from the storage means 11 with two areas, that is, the normal area A and the abnormal area B of the operation number (N), the operation number (N) detected by the operation number detection means 14 is It is discriminated whether it belongs to the normal zone A or the abnormal zone B (step 4 in FIG. 8).

  In step 4, the deflection amount (δ) belongs to the normal range A range from the reference value δ1 to the allowable value δ2, and the tension (F) belongs to the normal range A range from the reference value f1 to the allowable value f2. (L) belongs to the normal range A range from the reference value l1 to the permissible value l2, and the operation number (N) is determined to belong to the normal range A range from the reference value n1 to the permissible value n2. The belt 4 is recognized as a normal belt (step 8 in FIG. 8). Therefore, the endless belt 4 can be used without hindering the subsequent operation of the belt transmission mechanism 1.

  In step 4, the deflection amount (δ) belongs to the category of the abnormal region B with the excessive value δ3, the tension (F) belongs to the category of the abnormal region B with the excessive value f3, and the tension length (L) is the excessive value l3. The endless belt 4 determined to belong to the category of the abnormal region B and the number of operations (N) to belong to the category of the abnormal region B having the excessive value n3 indicates that the bending is excessive due to deterioration over time. This means that it is difficult to properly transmit power from the driving vehicle 2 to the driven vehicle 3 shown in FIG. 1 and that it is damaged or broken in a short time and prevents the belt transmission mechanism 1 from operating normally. 4 (step 9 in FIG. 8), the alarm means 12 such as a buzzer or a lamp is operated to notify the abnormality (step 10 in FIG. 8).

  In step 4, the deflection amount (δ) belongs to the category of the abnormal region C with the undervalue δ4, the tension (F) belongs to the category of the abnormal region C with the overvalue f4, and the tension length (L) is the undervalue. The endless belt 4 determined to belong to the category of the abnormal region B of l4 means that the initial tension when it is wound around the driving vehicle 2 and the driven vehicle 3 is too large, and the belt transmission mechanism 1 is recognized as an abnormal endless belt 4 that hinders normal operation (step 9 in FIG. 8), and notification means 12 such as a buzzer and a lamp is lit is operated to notify the abnormality (FIG. 8). Step 10).

  In the abnormality detection procedure of the flexible body according to the second embodiment, the deflection amount (δ) detected by the deflection amount detection means 7, the tension (F) detected by the tension detection means 10, and the tension length detection means 13 The detected tension length (L) and the number of operations (N) detected by the number-of-operations detection means 14 are the amount of deflection (δ), tension (F), tension length (L) stored in the storage means 11. ) And the number of operation (N) in the normal range A and the abnormal range (B, C) are determined by the determination means 8, but the amount of deflection (δ), tension (F), tension Normality of deflection (δ), tension (F), tension length (L) and number of operations (N) in which at least one of installation length (L) and number of operations (N) is stored in storage means 11 It may be a procedure in which the discriminating means 8 discriminates whether the zone A or the abnormal zone (B, C) belongs.

  In the first and second embodiments, since the abnormality of the endless belt 4 is detected while the belt transmission mechanism 1 is stopped, the transmission mechanism in which the endless belt 4 belonging to the category of the normal region A is stretched. 1 can be operated. Therefore, no trouble occurs immediately after the transmission mechanism 1 is operated. Therefore, maintenance can be achieved by avoiding disturbances in the manufacturing process, a reduction in manufacturing efficiency, or danger associated with breakage and scattering of the endless belt 4.

  The storage means 11 stores the limit operation number of the belt transmission mechanism 1 (the reference value n1) and the maintenance operation number (the allowable value n2) of the preceding stage, and the operation number of the belt transmission mechanism 1 detected by the operation number detection means 14. The determination means 8 determines whether (N) has reached the maintenance operation number (the allowable value n2), and the belt transmission mechanism 1 determined to have reached the maintenance operation number (the allowable value n2). By stopping the operation, maintenance can be achieved by taking effective measures such as replacing the endless belt 4 before the endless belt 4 becomes abnormal.

  In the first and second embodiments, the abnormality of the endless belt 4 is detected. However, the present invention is not limited only to the detection of the abnormality of the endless belt (endless flexible body) 4. Needless to say, it is possible to detect an abnormality of the belt-like belt (end flexible body). Further, in the first and second embodiments of the present invention, for example, the drawing frame 17 in the molded product take-out machine 16 mounted on the resin molding machine 15 shown in FIG. The belt transmission mechanism 1 to be referred to) and the lifting / lowering unit 19 are applied to the belt transmission mechanism 1 for moving the pulling frame 17 back and forth (see arrow Y) and the belt transmission mechanism 1 for moving the lifting / lowering unit 19 up and down. Not only can the abnormality of the belt in the product take-out machine 16 be detected, but also the abnormality can be detected when the belt transmission mechanism 1 is stopped, so that the repair immediately after the operation of the belt transmission mechanism 1 is not required. Maintenance can be achieved by avoiding the danger associated with the drop in the take-out efficiency or the breakage and scattering of the belt.

  Further, in the belt transmission mechanism 1 shown in FIG. 1, since the driving vehicle 2 and the driven vehicle 3 rotate around the horizontal axis, the tension side 4a of the belt 4 wound around this is pressed vertically downward by the deflection generating means 6. However, in the case of the belt transmission mechanism 1 in which the driving vehicle 2 and the driven vehicle 3 rotate around the vertical axis, the tension generation side 6a of the belt 4 wound around the belt transmission mechanism 1 is pressed in the horizontal direction by the bending generating means 6. That's fine.

It is explanatory drawing which shows an example of the belt transmission mechanism by which abnormality is detected by the abnormality detection method of the flexible body which concerns on this invention. It is a block diagram of the abnormality detection control circuit of the first embodiment. It is a graph which shows the relative relationship between the bending amount ((delta)) of a flexible body, and tension | tensile_strength (F). It is explanatory drawing which shows the state of the bending of a flexible body. It is a flowchart of the abnormality detection procedure of 1st Embodiment. It is a block diagram of the abnormality detection control circuit of 2nd Embodiment. It is a graph which shows the relative relationship between the bending amount ((delta)) of a flexible body, tension | tensile_strength length (L), and the operating number of a belt transmission mechanism. It is a flowchart of the abnormality detection procedure of 2nd Embodiment. It is a perspective view which shows an example of the molded article extraction machine suitable for application of this invention.

Explanation of symbols

1 Belt transmission mechanism (transmission mechanism with a flexible body stretched)
4 Endless belt (flexible body)
6 Deflection Generation Means 7 Deflection Amount Detection Means 8 Discrimination Means 9 Control Circuit 10 Tension Detection Means 11 Storage Means 12 Notification Means 13 Overhang Length Detection Means 14 Operating Number Detection Means A Normal Area B Abnormal Area C Abnormal Area (δ) Deflection Quantity (F) Tension (L) Tension length (N) Number of operations

Claims (4)

Based on the relative relationship between the amount of bending of the flexible body of the flexible body transmission mechanism and the tension of the flexible body corresponding to this amount of bending, the amount of bending and tension are in the normal range where the transmission mechanism can operate normally. Storage means for distinguishing and storing in advance in two areas, an abnormal area where normal operation is hindered, a deflection amount detection means for detecting the deflection amount of the flexible body, and a tension detection for detecting the tension of the flexible body Means and
At least one of the flexure amount and the tension of the flexible body detected by the detection means falls into any of the normal range and abnormal range of the flexure amount stored in the storage means, or the normal range and abnormal range of the tension. A method for detecting an abnormality of a flexible body, characterized by determining whether the flexible body belongs to a category of an abnormal region by determining whether the flexible body belongs to an abnormal area. Based on the relative amount of flexure of the flexible body transmission mechanism and the flexure body tension, the length of the flexible body corresponding to the flexure amount, and the number of operation of the transmission mechanism, the amount of flexure is calculated. Storage means for preliminarily storing the tension, the tension length and the number of operation of the transmission mechanism separately in two areas, a normal area where the normal operation of the transmission mechanism is possible and an abnormal area where normal operation is hindered; Deflection amount detection means for detecting the deflection amount of the flexible body, tension detection means for detecting the tension of the flexible body, tension length detection means for detecting the tension length of the flexible body, and the transmission An operation number detecting means for detecting the operation number of the mechanism,
At least one of the flexure amount, tension, tension length, and number of operation of the transmission mechanism detected by the detection means is the normal range and abnormal range of the flexure amount stored in the storage means, and normal tension. Determine whether it belongs to the normal range or abnormal range of the extension length, normal zone or abnormal zone of the extension length or normal zone or abnormal zone of the operating number of transmission mechanism. A method for detecting an abnormality of a flexible body, comprising: recognizing that the flexible body determined to be abnormal is abnormal. In the abnormality detection method of the flexible body of Claim 1 or Claim 2,
An abnormality detection method for a flexible body, wherein an abnormality of the flexible body is detected when the transmission mechanism is stopped. In the abnormality detection method of the flexible body of Claim 1, Claim 2 or Claim 3,
The storage means stores the number of maintenance operations preceding the limit operation number of the transmission mechanism, and the determination means determines whether the number of operation of the transmission mechanism detected by the operation number detection means has reached the maintenance operation number. An abnormality detection method for a flexible body, wherein the operation of the transmission mechanism determined to have reached the number of maintenance operations is stopped.

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