JP2000104791A - Life advance notice device of open belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To warn life of an open belt outside by mechanically detecting the life before the open belt is cut off. SOLUTION: Life of an open belt 1 is noticed in advance by outputting an alarm at the time of detecting breakage or a change of resistance value by a breakage detection means 6 to detect breakage of an electric current on a current-carrying wire 5 or a voltage detection means to detect applied voltage by a change of electric resistance of this current-carrying wire by using at least more than one of conductors 2 as the current-carrying wire 5 on the open belt 1 burying a plural number of the conductors 2 in the longitudinal direction to bear tensile strength of the belt.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an open belt used for a transport machine or a reciprocating transmission machine such as a long reciprocating synchronous transmission, a long span reciprocating transport, a synchronous transport, a tact transport, and a clean transport. The present invention relates to an open belt life notifying device for detecting and notifying the life of an open belt before the end of its useful life due to fatigue or breakage while the open belt is repeatedly used.

[0002]

2. Description of the Related Art Conventionally, when a relatively heavy object is reciprocated vertically or horizontally, a moving screw shaft having a spiral groove formed on the outer surface of a long metal cylinder and a moving screw shaft are screwed to the moving screw shaft. And a support nut having a nut function to fix the object to one end of the moving screw shaft, and to move the moving screw shaft in the axial direction by driving means to reciprocate the object. Reciprocating transmission machines are generally known.

However, with the recent technological progress, the basic configuration of the moving screw shaft and the supporting nut has been changed to provide, for example, a long moving rod O as shown in FIG. A belt-shaped toothed belt fixed at both ends, a so-called open belt P, a rotating pulley R associated with a driving means Q, and a pair of idlers provided alongside the rotating pulley R to support the open belt P S, the object T is fixed to one end of the moving rod O, and the moving belt O is moved vertically by moving an open belt P by a rotary pulley R, thereby reciprocating the object T. The intended reciprocating transmission machine is being used.

As shown in FIG. 6, an endless open belt P having both ends of an open belt P fixed by a belt fixing plate U, a rotary pulley R associated with a driving means Q, and a rotary pulley R It is basically composed of a rotatable driven pulley V that is synchronized, and the object T is placed on the open belt P, and the open belt P is rotated by the rotary pulley R to horizontally move the object T. A transport machine for moving the object T is also used.

In such a reciprocating transmission machine or a transporting machine using such an open belt P, if the open belt P is cracked or cut, it directly leads to a serious accident. Actually, the endurance time and the replacement time are carefully set in advance, and the set time is predicted to be the life of the open belt.

[0006]

However, even if the life of the open belt is carefully set including the safety factor, unexpected things may occur from the test data depending on the work circumstances. In the unlikely event that the open belt is accidentally cut, a catastrophic accident involving the lives of workers may occur.

[0007] In order to avoid such a catastrophe, the present applicant has made intensive studies as to whether or not any mechanical detection can be performed before the open belt is cut. If it is possible to mechanically detect when a crack occurs in the open belt, preferably when the open belt reaches the tension limit before the crack occurs, the life of the open belt is predicted, and this detection is performed. At the same time, he warned the outside that the open belt life would not be announced.

[0008]

According to the present invention, there is provided an open belt in which a plurality of cores are embedded in a longitudinal direction so as to provide a tensile strength of the belt. Characterized by comprising a disconnection detecting means for using at least one of the above as a transmission line and detecting a disconnection of the energizing line, and an alarm device for outputting an alarm when the disconnection is detected by the disconnection detecting means. A belt life notifier is provided.

According to a second aspect of the present invention, in an open belt in which a plurality of core wires are buried in the longitudinal direction so as to provide the tensile strength of the belt, the core wires are used as a plurality of conducting wires connected in parallel and connected in parallel. Voltage detecting means for detecting an applied voltage due to a change in the electrical resistance of the energized line, and an alarm device for outputting an alarm when the applied voltage changes to a predetermined level by the voltage detecting means. It is not intended to provide an open belt life notice device.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an open belt life predicting apparatus according to an embodiment of the present invention. First Embodiment (corresponding to claim 1) FIG. 1 is a schematic front view showing an example of an open belt life predicting device according to the present invention, and FIG. 2 is a partial perspective view of the open belt.

In FIG. 1, reference numeral 1 denotes an open belt in which a plurality of core wires 2 are buried in the longitudinal direction so as to bear the tensile strength of the belt. As the open belt 1, as shown in FIG. 2, a plurality of cores 2 are generally embedded in the longitudinal direction of a belt-shaped rubber belt having both ends to bear the tensile strength of the belt. Are conductive, and in the present embodiment, the core wire 2 having such conductive properties
Use the open belt 1 buried.

A reciprocating transmission machine such as a long reciprocating synchronous transmission and a transporting machine use a toothed belt having an open belt 1 on one side of which continuous irregularities 3 are formed. Such an open belt 1 is generally formed by pouring a rubber material into a mold having the irregularities 3 formed on one side and installing the plurality of core wires 2, and then embossing and firing the belt to provide a high-tensile open toothed belt. Specifically, there are "Iron Rubber AT Belt" manufactured by Pleco, Germany, and (registered trademark).

Except for one end on one side of the open belt 1 in which the conductive wires 2 are buried in advance in this way, the ends of the pair of adjacent wires 2 are electrically connected so as to be in the state shown in FIG. The core wire 2 is used as the electric wire 5 by sequentially connecting the connection wires 4 having a certain shape. Therefore, since an open belt conventionally available on the market can be used, there is no need to newly embed the conducting wire 5, and the open belt 1 according to the present invention can be manufactured inexpensively and easily.

Next, reference numeral 6 in FIG.
This is a disconnection detecting means for detecting disconnection of the line. As an example of the disconnection detecting means 6, one end of the conducting wire 5 embedded in the open belt 1 as described above is connected at one end to the ground side, and at the other end is a light emitting diode having two poles and a photo diode having two poles. A so-called photocoupler with a transistor in one package 7
Is connected to the input terminal a.

The other input terminal b of the photocoupler 7 is connected to a DC power supply. If the input terminal b is connected to the same power supply as driving means (not shown) such as the reciprocating transmission machine and the transporting machine, a mechanical drive is performed. This is preferable because the open-belt life predictor is reliably activated simultaneously with the operation. On the other hand, a disconnection detecting unit 6 according to the present invention is configured by connecting an existing current detecting unit 8 to the two output terminals A and B of the photocoupler 7.

The disconnection detecting means 6 confirms that a current is flowing by the current detecting means 8 during energization, that is, when the energizing line 5 of the open belt 1 is not disconnected. In this state, it can be detected by the fact that the current flow cannot be confirmed. Reference numeral 9 in the figure denotes an alarm device that outputs an alarm when the disconnection is detected by the disconnection detecting means 6.

More specifically, a buzzer, a siren, a rotating light, or the like for notifying an alarm externally by sound, light, vibration, or the like can be considered. Such an alarm device 9 is connected to the current detecting means 8 and the current is detected. The alarm device 9 is set to operate only when the detection means 8 cannot confirm the current. If the alarm device 8 has a built-in current detecting means 7,
This is desirable because it is only necessary to connect the alarm device 9 to the output terminals A and B.

The apparatus for estimating the life of an open belt according to the present invention having the above-described structure operates as follows. That is, by activating drive means (not shown) such as a reciprocating transmission machine and a transport machine as in the prior art, the power supply line 5 of the open belt 1 is energized at the same time as these machines start operating, and the disconnection detection means 6 The detection is performed.

If there is no disconnection of the conducting wire 2, the current detecting means 8 in the disconnection detecting means 6 confirms the energization,
The operation is performed in the same manner as before without activating the alarm device 9. On the other hand, in the course of the work, if one portion of the energizing wire 2 of the open belt 1 is cut and disconnected, the current detecting means 8 of the disconnection detecting means 6 immediately confirms the disconnection and informs an operator or the like of an alarm. A worker near the squeezing machine is blamed and stops the driving means of the machine.

By connecting the disconnection current detecting means 8 or the alarm device 9 to the OFF power supply of the driving means, it is possible to stop the driving means of the machine simultaneously with the alarm. Thus, according to the open-belt life prediction device of the present invention, by using the core wire 2 stretched over the entire open belt 1 as the electric wire 5, disconnection occurs even at one location of the core wire 2. In other words, if the crack or cut occurs unexpectedly even in one place of the open belt 1, the core wire 2 is broken before the crack which is the tension limit of the open belt 1, so the opening is detected by detecting the break. A warning is given by the alarm device 9 before the belt 1 itself is cut, so that a large accident due to the cutting of the open belt 1 can be prevented.

A rubber material forming the open belt 1 itself and an energizing wire 5 formed using the core wire 2 are used.
It is well known that the latter energizing line 5 has a lower tension limit value, but by utilizing the height difference between the two tension limit values, the energizing line 5 can be cut before the open belt 1 is cut or cracked. It is added that a large accident due to disconnection and disconnection of the open belt 1 can be prevented.

Next, FIG. 3 is a schematic front view showing another example of the open belt life predicting device according to the present invention. In this embodiment, the open belt 1 is used.
Of the core wires 2 embedded in the open belt, only two core wires 2 located at both ends of the open belt 1 are used to form a life predictor for the open belt. In the case where a band-shaped object such as 1 is cut, the object characteristic that the band-shaped object is sequentially cut from both side ends toward the center when the tension limit approaches is utilized.

That is, as shown in FIG. 3, the open-belt life predictor of this embodiment connects only one end of one side of the open belt 1 having the core wire 2 embedded therein with the connection line 4. Further, both ends of the other side of the open belt 1 are connected to the ground and the photocoupler 7 as described above, respectively, and others are connected to the disconnection detecting means 6, the current detecting means 8 and the alarm device 8 as described above.

By using only the core wires 2 at both ends of the open belt 1 as the transmission wires 5 in this manner, it is sufficient to connect only one connecting wire 4, and the open belt 1 according to the present invention can be easily and quickly manufactured. Therefore, the manufacturing cost can be reduced. [Second embodiment (corresponding to claim 2)] FIG. 4 is a schematic front view showing another embodiment of the open belt life predicting device according to the present invention. In the present embodiment, while the above-described embodiment detects a disconnection of a current due to series connection, a change in voltage due to parallel connection is not detected.

In this embodiment, members similar to those described above will be described with reference to common drawing numbers. In the figure, reference numeral 1 denotes an open belt 1 in which a plurality of core wires 2 are buried in the longitudinal direction to bear the tensile strength of the belt, and the above-mentioned commercially available belt can be used. As shown in the figure, both ends of the open belt 1 are connected to the adjacent core wire 2 in sequence from the endmost core wire 2 by the connection wire 4 to form a conducting wire 5, and a + electrode (a) is provided on one side. On the other side, a negative electrode (b) is connected to configure in parallel.

The electrodes (a) and (b) are respectively connected to voltage detecting means 10 for detecting an applied voltage due to a change in electric resistance of the conducting wire 2 connected in parallel. Although an existing device can be used as the voltage detecting means 9, this embodiment employs any device that can operate the alarm device 9 that outputs an alarm when the applied voltage changes to a predetermined level by the voltage detecting device 10. Is done.

As described above, when the current-carrying wires 5 are connected in parallel and the apparatus is started simultaneously with the driving means of the machine and a constant current flows between the electrodes (a) and (b), the current is generated. A constant voltage is generated. In addition to the case where a disconnection occurs at one place of the energizing line 5, if only one of the metal twisted wires constituting the energizing line 5 is disconnected, the resistance changes due to the disconnection and a voltage change occurs. .

Further, even if one of the metal stranded wires does not break, even if the energizing wire 5 elongates due to the tensile force,
This elongation changes the resistance and causes a voltage change. Therefore, the level of this voltage change is set in the voltage detecting means 10 in advance, and when the applied voltage changes to a predetermined level, the voltage detecting means 10 activates the alarm device 9 and issues an alarm to a worker or the like. The worker near the machine is blamed and stops the driving means of the machine.

The voltage detecting means 10 and the driving means
By connecting to the OFF power source, it is possible to stop the driving means of the machine at the same time as the alarm. in this way,
When the conducting wires 5 are arranged in parallel, the conducting wires 5
Before the wire breaks at one point, that is, when even one of the metal stranded wires constituting the conducting wire 5 is broken, the danger can be predicted by the voltage change. You can do it.

[0030]

As described above, according to the apparatus for predicting the life of an open belt according to the first aspect of the present invention, of the plurality of cores embedded in the open belt, only the core having an energizing line is used. Since the electric wire is configured, it can be used as an open belt as before without reducing the strength of the open belt, and the core wire stretched around the entire open belt, that is, broken even at one place of the conducting wire In other words, if the cracks or cuts occur unexpectedly even at one location of the open belt, the energizing wire is disconnected before the crack which is the tension limit of the open belt, and the warning of the open belt life is given by the alarm device. It is possible to prevent a major accident caused by cutting the open belt.

Further, in the course of the work, if one of the energized wires of the open belt is cut and disconnected, the current detecting means in the disconnection detecting means immediately confirms the disconnection and informs the worker or the like of the alarm. Workers in the vicinity of the squeezing machine can be blamed, so that no personal injury occurs. Further, according to the open-belt life predicting device of the present invention in claim 2, since a plurality of conductive wires are connected by connecting wires so as to be parallel to each other, one portion of the conductive wire is disconnected. In the previous state, that is, when even one of the metal stranded wires constituting the conducting wire is broken, or even if one of the metal stranded wires is not broken, by the tensile force applied to the open belt When a certain amount of elongation occurs in the conductive wire, a resistance is applied to the conductive wire. It can be done.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing an example of an open belt life notice device.

FIG. 2 is a partial perspective view of an open belt.

FIG. 3 is a schematic front view showing another example of the open belt life notice device.

FIG. 4 is a schematic front view showing another embodiment of an open belt life notice device.

FIG. 5 is a front view showing an example of a conventional reciprocating transmission machine.

FIG. 6 is a front view showing an example of a conventional transport machine.

[Explanation of Signs] 1 Open belt 2 Core wire 3 Unevenness 4 Connecting wire 5 Conducting wire 6 Disconnection detecting means 7 Photocoupler 8 Current detecting means 9 Alarm device 10 Voltage detecting means a, b input terminal A, B output terminal (a) + Electrode (b)-Electrode

Claims (2)

[Claims] An open belt in which a plurality of cores are buried in a longitudinal direction so as to provide a tensile strength of the belt, wherein at least one of the cores is used as a transmission line, and disconnection detecting means for detecting a disconnection of the current-carrying line. A warning device for outputting a warning when a disconnection is detected by the disconnection detecting means. 2. An open belt in which a plurality of cores are buried in the longitudinal direction so as to bear the tensile strength of the belt, wherein the cores are used as a plurality of power supply lines connected in parallel. Service life notice of an open belt, comprising: voltage detection means for detecting an applied voltage due to a change in electric resistance; and an alarm device for outputting an alarm when the applied voltage changes to a predetermined level by the voltage detection means. apparatus.